111_nC&R Panel (with automation)-MARCH,2011 (R1)

HARYANA VIDYUT PRASARAN NIGAM

TECHNICAL SPECIFICATION FOR 220 kV, 132 kV, 66 kV & 33 kV CONTROL AND RELAY PANEL

BOARDS FOR SUBSTATIONS WITH SUBSTATION

AUTOMATION SYSTEM

[SPECIFICATION NO.HPD/S-63R/HPM-468/Vol-II/Prot. (MARCH, 2011)]

CHIEF ENGINEER/MM,

DESIGN DIRECTORATE, HVPNL, SHAKTI BHAWAN, Basement,

SEC-6, PANCHKULA 134109 (HARYANA)

Tel./Fax No. 0172-2583724

C:\Users\ITMS4\Desktop\technical specification July11\nC&R Panel (with automation)-MARCH,2011 (R1).doc 1

CONTENTS -------------------------------------------------------------------------------- CLAUSE NO. TITLE PAGE NO. --------------------------------------------------------------------------------- 1.0 SCOPE 3 2.0 STANDARDS 3 3.0 SERVICE CONDITION 4 4.0 PRINCIPAL PARAMETERS 5 5.0 GENERAL TECHNICAL REQUIREMENTS 5 6.0 TESTS 24 7.0 DOCUMENTATION 25 ANNEXURES A. GUARANTEED TECHNICAL PARTICULARS 27 B. TECHNICAL PARTICULARS OF CTs, NCTs, PTs & CVTs 32 C. TRANSMISSION LINE DATA 51 D. SCHEDULE OF DEVIATIONS FROM THE SPECIFICATION 52 E. LINE PARAMETERS 53 F. DETAILS OF CARRIER EQUIPMENTS 54 ---------------------------------------------------------------------------------


1.0 SCOPE: 1.1 This specification covers the design, engineering, manufacture, inspection &

testing at manufacturer's work before despatch, packing, forwarding and delivery at discretion of purchaser of Control & Relay Panels for 220 kV, 132 kV & 66 kV S/Stns. having Substation Automation System in the state of Haryana.

1.2 Unless specifically excluded from the offer, all fittings and accessories, not specifically stated in this specification but which are necessary for satisfactory operation of the scheme or to complete the work in a good workman like manner shall be deemed to have been included in the scope of supply of the Bidder.

1.3 CO-ORDINATION : Circuit Breakers, CT's, PT's/CVT's & Isolating Switches, etc. are being purchased

against separate specification. The particulars of CTs, PTs and CVTs existing/ to be arranged are listed at Annexure 'B'. The Supplier of control & relay boards shall be responsible for preparing complete wiring diagram of 33kV,66kV,132 kV & 220 kV C&R panel boards and shall also undertake to mount & wire any equipment received from other supplier. The schematic of breakers & isolators are required to be incorporated in the panel schematic.

1.4 EXPERIENCE: 1.4.1 For 400kV & 220kV C&R Panels: The supplier of C&R panels shall be manufacturer of relays and all the main

relays on the C&R panels shall be of his make only. However, one of the distance protection schemes on each 220 kV feeder C&R panel can be of different make in view of the fact that both the distance protection scheme (Main-I & Main-II) should have different measuring techniques.

1.4.2 For 132kV, 66kV & 33kV C&R Panels: The supplier of C&R panels shall be manufacturer of relays and all the main

relays on the C&R panels shall be of his make only. The suppliers own make relay includes the relays manufactured by their Principals/Associates and they have their service centre with them.

2.0 STANDARDS : 2.1 The equipment offered shall conform to latest relevant Indian Standards listed

hereunder or equivalent IEC :- Sr. No. Standard Title 1. IS: 5 Colour for ready mix paints. 2. IS: 375 Marking & arrangements for switchgear, bus bars, main

connections & auxiliary wiring. 3. IS: 694 PVC insulated cable for working voltage upto and

including 1100 V. 4. IS: 722 AC Electricity meters. 5. IS: 1248

Part-I& IV Direct acting indicating analogue electrical measuring instruments & their accessories.

6. IS: 2419 Dimensions for panel mounted indicating & recording electrical instruments.

7. IS :3231 Electrical relays for power system protection. 8. IS :8686 Static protective relays. 9. IS :2147 Degree of protection provided by enclosures for low

voltage switchgear & control gear.


2.2 The works covered by the specification shall be designed, engineered, manufactured, built, tested and commissioned in accordance with the Acts, Rules, Laws and Regulations of India.

2.3 The equipment to be furnished under this specification shall conform to latest issue with all amendments of standard specified above.

2.4 In addition to meeting the specific requirement called for in the Technical Specification, the equipment shall also conform to the general requirement of the relevant standards and shall form an integral part of Specification.

2.5 The Bidder shall note that standards mentioned in the specification are not mutually exclusive or complete in themselves, but intended to compliment each other.

2.6 The Contractor shall also note that list of standards presented in this specification is not complete. Whenever necessary the list of standards shall be considered in conjunction with specific IS/IEC.

2.7 When the specific requirements stipulated in the specification exceed or differ than those required by the applicable standards, the stipulation of the specification shall take precedence.

2.8 Other internationally accepted standards which ensure equivalent or better performance than that specified in the standard referred shall also be accepted.

2.9 In case governing standards for the equipment is different from IS or IEC, the salient points of difference shall be clearly brought out alongwith English language version of standard or relevant extract of the same. The equipment conforming to standards other than IS/IEC shall be subject to Employer's approval.

2.10 The bidder shall clearly indicate in his bid the specific standards in accordance with which the works will be conformed.

3.0 SERVICE CONDITIONS: 3.1 Equipment to be supplied against this specification shall be suitable for

satisfactory continuous operation under the following tropical conditions:- i) Location IN THE STATE OF HARYANA ii) Max. ambient air temp (C) 50 iii) Min. ambient air temp (C) -2.5 iv) Maximum Relative humidity (%) 100 v) Minimum Relative humidity (%) 26 vi) Average annual rainfall (mm) 900

vii) Max. wind pressure (kg/sq. m.) 195 viii) Max. altitude above mean sea level (meters). 1000 ix) Isoceraunic level (days/Year) 50 x) Seismic level (horizontal acceleration) 0.3 g xi) Average number of dust storm 35 (days per annum)

Note:-i)Moderately hot and humid tropical climate conducive to rust and fungus growth.

The climatic conditions are also prone to wide variations in ambient conditions. ii)Air conditioning or any special arrangement for making the control room dust

proof shall not be provided in any of the S/Stn. 3.2 All control wiring, equipment & accessories shall be protected against fungus

growth, condensation, vermin & other harmful effects due to tropical environments.


3.3 AUX. POWER SUPPLY : i) A.C. Supply : 415/240 Volts, 3-phase, 4-wire, 50 Hz Voltage variation : 10% Frequency variation : 3%

ii) D C Supply : 220 Volts, 2 wire available from S/Stn. battery(insulated)

Variation : 10%.

3.4. 220 kV, 132 kV, 66 kV & 33 kV voltages will be three phase having normal frequency of 50 Hz subject to a variation of 3%. Neutrals of the Power Transformers at the S/Stn. covered in this specification are solidly earthed.

4.0 PRINCIPAL PARAMETERS: 4.1 The panel shall have the principal dimensions as detailed below:- i). Depth of panels = 610 mm ii).a) Height of switchboard above base frame = 2210 mm b) Height of base frame = 102 mm iii). Type of Panels = Simplex Control & Relay Panel

Note:- The offer of the bidder not conforming to above requirement shall be out rightly rejected.

4.2 ARRANGEMENT OF PANELS: The panels shall be fabricated so that even if the serial of panels is changed no difficulty will be faced in the placement of panels and cabling etc. The sequence of various panels in a panel board at a S/Stn. shall be supplied to successful bidder.

5.0 GENERAL TECHNICAL REQUIREMENTS:

5.1 MATERIAL & WORKMANSHIP: All material used in the construction of the panels/relays shall be of the best

quality obtainable of their respective kind and whole of the work shall be of the highest class, well finished and of approved design and make.

Castings shall be free from blow-holes, flaws, cracks or other defects and shall be smooth grained and of true dimensions and forms.

The draw out mechanism in respect of draw out relays should be smooth and convenient so as to give adequate service during their use.

5.2 DEPARTURE FROM THE SPECIFICATION:

Should the tenderer wish to depart from the provisions of this specification either on account of manufacturing practice or for any other reasons, he will draw specific attention to the proposed points of departure on the prescribed Performa (enclosed) at annexure-D in his tender and submit such full information, drawings and specifications as will enable the merit of his proposal to be appreciated. In the event of contractor drawings, specification and tables etc. disagreeing with this specification during the execution of the contract this specification shall be held binding unless the departures have been fully recorded as required above.

5.3 PAINTING: All unfinished surfaces of steel panels and frame works shall be sand blasted to

remove rust scale, foreign adhering matter & grease. A suitable rust resistance primer shall be applied on the interior & exterior of steel which will be followed by


application of an under coat suitable to serve as base for finishing coat. The finishing coat shall be as under: - Exterior - Stove enameled light grey as per shade No.631 of IS: 5.

Interior - stove enameled white. Base frame - Stove enameled glossy black. 5.4. TESTING EQUIPMENT AND TESTING FACILITIES ON THE RELAYS:

The tenderer shall recommend suitable testing equipment (alongwith quantity) required for field testing of protective schemes and other relays offered against this specification. The actual quantity to be ordered shall be determined by the Purchaser. Also adequate testing facilities should be provided on the relay so as to test them without the necessity of their removal or making any extra connections. The Bidder will clearly indicate the testing procedure to be followed in respect of relays offered.

5.5 The transmission lines shall be either in form of overhead conductor or combination of overhead conductor & underground cable. The tentative transmission line data in respect of 220kV, 132kV & 66 kV lines covered in this specification is given at Annexure-C. The standard chart providing the details of per unit values of Z1, Z2 & Z0 on 100 MVA base per 100 km of line for calculating these values for full lengths of lines are enclosed at Annexure-E. The tentative details of carrier equipment are enclosed at Annexure-F. The suitability of distance scheme offered with reference to the above parameters may be seen. Guaranteed test sheets as per Annexure A shall be submitted by the tenderer. Relevant literature shall be supplied along with the bid for proper appreciation of the offered equipment.

5.6 SUPERVISORY SERVICES: The tenderer may offer supervisory services, panel wise testing & commissioning of 220kV, 132 kV, 66 kV & 33 kV panel included in the specification. The tenderer may quote their rates on diem basis category-wise with their terms & conditions. The rates quoted should be valid for at least three years form the date of receipt of equipment by us.

5.7 TRANINING OF PERSONNEL: The contractor will provide free facilities for training the purchaser's technicians /Engineers at his works, design office and HVPNL's site. He will intimate in advance the schedule of completion of designs and manufacture of equipment against the contract (of this specification) or similar equipment to be manufactured at the works so that the purchaser may depute upto 3 technicians & 3 engineers for training at the manufacture assembly, testing, operation and commissioning etc. including testing and commissioning of protective relays, covering training in detecting faults in static relays complete explanation of the schematic wiring and wiring schedule of the relays/scheme together with full understanding regarding the functional modules of the relays/scheme shall be given to the Engineer / technicians. The topics of CTs & PTs towards relay application shall also be kept under the scope of training. The training shall be arranged by the contractor at the works in such a way that the persons under training shall be freely acquainted with


the equipment. The engineers / technicians shall also be provided with relay/scheme guides/instruction manuals covering drawings of functional modules of relays/schemes. The period of training will be not exceeding 15 days and all expenses shall be borne by the purchaser.

5.8 GENERAL DESCRIPTION:

5.8.1. SIMPLEX C&R PANEL BOARDS: The panels shall be of `simplex' type & consisting of separate cubicles (for each

circuit complete with side covers) made of sheet steel of thickness not less than 10 SWG for the base frame, door frame and front portions of the cubicles and not less than 14 SWG for door, side, top & bottom portion having provision for extension at both ends with internal wiring, illumination with door operated off & on switch. The cubicle shall be suitable for floor mounting with its bottom open. Each cubicle shall be fitted with flush mounted steel hinged door & lock at the back & all the equipments will be mounted in front. The supply shall include suitable grouting bolts and nuts etc. All holes and extension windows shall be blanked and access doors shall be provided with compressible liners at the edges.

These simplex panels offered may, therefore, match in following respects:- i) Height-wise and depth-wise matching. The control & relay Panels shall be completely dust & vermin proof. The enclosure shall provide degree of protection not less than IP-31 in accordance with IS: 2147 and shall be suitable for tropical use.

NOTE:- For testing purpose a small opening with a cap to close the same is required to be provided to extend the testing leads on front side of the relay panel.

5.9 GENERAL REQUIREMENTS OF RELAYS:

All relays shall conform to the requirements of IS:3231/IEC-60255/IEC 61000 or other applicable standards. Relays shall be suitable for flush or semi-flush mounting on the front with connections from the rear. All protective relays shall be in draw out or plug-in type modular cases with proper testing facilities. Necessary test plugs/test handles shall be supplied loose and shall be included in contractors scope of supply.

All main protective relays shall be numerical type and communication protocol shall be as per IEC 61850. Further, the test levels of EMI as indicated in IEC 61850 shall be applicable to these.

For numerical relays, the scope shall include the following: a) Necessary software and hardware to up/down load the data to/from the relay

from/to personal computer installed in the substation. However, the supply of PC is not covered under this clause.

b) The relay shall have suitable communication facility for future connectivity to SCADA. The relay shall be capable of supporting IEC 61850 protocol (with fibre optical port) and shall be compatible with existing SAS (may be of other make).

c) Numerical relays should have clock (Real Time Clock) with inbuilt battery back up having life span of about 10 years.

d) Numerical relays shall have adequate no. of output contacts and LEDs to meet the specification / Scheme requirement. All numerical relays shall be supplied pre-configured as per specification / scheme requirements / approved drgs.


5.10 TRIP CIRCUIT SUPERVISION RELAY: The relay shall be capable of monitoring the healthiness of each trip coil and associated circuit of circuit breaker during "on & off" conditions. The relay shall have time delay on drop-off of min. 200 milli seconds and shall be provided with operation indicator.

220 kV circuit breakers being procured are generally equipped with 2 trip coils in each phase/pole of the breaker. For monitoring of trip circuits, both in òpen' & `close' position of the circuit breaker, 6 Nos. automatic trip circuit supervision relays (one for each pole and each trip coil) are proposed. For monitoring of entire trip circuit (from control & relay panel terminal to the trip coil of circuit breaker) both in òpen' & `close' position of the circuit, 2 No. automatic trip circuit supervision relays are proposed for 132kV,66kV & 33kV panels except 1No. Automatic trip circuit supervision relay is proposed for 33kV Line & Capacitor Panels.

5.11 D.C. FAIL ALARM RELAY: A suitable relay for monitoring the Trip Circuit D.C. wiring of the control and relay panels shall be provided. The relay shall have time delay on drop-off of min. 100 milli seconds and shall be provided with operation indicator.

5.12 VOLTAGE SELECTION SCHEME: The 220kV, 132kV, 66kV & 33kV bus PTs exist on all the phases of both the

220kV, 132kV, 66kV & 33kV buses at substations having double bus arrangement. Proper voltage selection scheme shall be provided on panels.

5.13 AUTO RECLOSING SCHEME: 5.13.1The protective scheme shall incorporate the necessary equipment to impart

auto-reclosing impulse to the circuit breaker when it has tripped either due to the operation of the line protection scheme in the first zone or the accelerated operation of it with the help of carrier equipment. No auto-reclosing impulse shall be transmitted in the event of a fault cleared by the 2nd, 3rd & 4th zone of line protection scheme. Auto-reclosing will also be blocked in case the circuit breaker is tripped manually.

5.13.2The provision of single & three phase auto-reclosing is to be made on 220 kV

feeder C&R panels. 5.13.3 CHECK SYNCHRONIZING & DEAD LINE CHARGING SCHEME : Check synchronizing relay and dead line charging equipment shall be provided for

220 kV feeder C&R panels. The check synchronizing relay shall compare the phase angle & frequency of the ìncoming' and `running' supplies and allow the auto-reclose to take place only if the said parameters are within the permissible limits. The dead line charging equipment shall ensure auto-reclosing a circuit breaker on to a `dead' line leaving the checking of synchronism of two supplies to the other end of it.

Synchronizing check relay with necessary auxiliary equipments shall be provided which shall permit breakers to close after checking the requirements of synchronizing of incoming and running supply. The phase angle setting shall not exceed 35 degree and have voltage difference setting not exceeding 10%. This relay shall have a response time of less than 200 milliseconds when the two


system conditions are met within preset limits and with the timer disconnected. The relay shall have a continuously adjustable time setting range of 0.5-3secs.

5.13.4 A four position stay-put non-locking type of auto-reclose selector-switch shall be provided on each of the 220 kV feeder C&R panels and shall have the following four positions:

a) `Single phase auto: In this position, the relay shall allow single shot single pole auto reclosing for single line to ground fault. For any other fault, the scheme shall allow all the three poles of the circuit breaker to trip & lock them out.

b) `Single & three phase auto: In this position the relay shall allow single shot single pole auto-reclosing for single line to ground fault and three pole auto-reclosing for other faults such as line to line, double line to ground and three phase faults.

c) `Three phase auto' : In this position, the relay shall impart three pole, single shot-reclosing impulse irrespective of the type of fault.

d) `Non - auto' : By putting the switch in this position it shall be possible to make the reclosing scheme totally inactive and all the three poles of the circuit breaker shall trip irrespective of the nature of a fault.

5.13.5 The reclosing scheme shall automatically reset after any successful reclosure and shall lock out in case the circuit breaker trips immediately after reclosure. Also the (reclosing) scheme shall not initiate reclosing upon an unsuccessful attempt to manually close circuit breaker.

5.13.6 There shall be clear target indications for successful & un-successful operation. 5.13.7 The auto-reclosing scheme shall have continuously variable dead time setting

range of 0.1-2secs for single phase reclosing as well as for three phase reclosing. The scheme shall have continuously variable reclaim time setting range of 5-300secs.

Note:- The auto reclosing scheme in built with numerical distance protection relays is acceptable provided it is available in both Main -I and Main-II distance protection schemes and meets the above specification.

5.14 PROTECTION SCHEME:

Note:- The Protection Scheme shall be suitable for 5A current (instead of 1A) in case of 33kV Level.

5.14.1 PROTECTION SCHEME FOR POWER TRANSFORMERS. A) TRANSFORMER DIFFERENTIAL PROTECTION :

The relay shall i) Be triple pole numerical type. ii) Have 3 instantaneous high set over-current units. iii) Have second harmonic restraint or other inrush proof feature and be stable

under normal over fluxing condition.


iv) Have fifth harmonic by pass filter or similar other arrangement to prevent mal-operation of the relay under operating conditions.

v) Be suitable for rated current of 1A and include necessary ICTs for ratio & phase angle correction.

vi) Have operating current setting sufficiently low (15% or less) so as to cover practically the whole of the transformer against all types of faults.

vii) Have adjustable bias setting range of 20- 50%. viii) Have maximum operating time of 30milli seconds at 5 times the rated

current. ix) Be provided with necessary terminals & links to measure current in

restraining circuits & in the operating circuits of all the phases under load without making any wiring changes.

x) Cover the lightning arrestors (proposed to be provided very close to the transformer) in the zone of protection.

xi) The Scheme shall have in-built features of disturbance recorder and event logger. For disturbance recorder and event logger features, it shall have 8 analog and 16 digital channels (out of which at least 8 shall be external digital inputs). It shall have its own time generator and the clock of the time generator shall be such that the drift is limited to +0.5 seconds/day, if allowed to run without synchronization. Further, it shall have facility to synchronize its time generator from Time Synchronization Equipment having output of following types.

Voltage signal: (0-5V continuously settable, with 50m Sec. minimum pulse duration)

Potential free contact (Minimum pulse duration of 50 m Sec.) IRIG-B RS232C

The recorder shall give alarm in case of absence of synchronizing pulse within specified time.

a) The disturbance recorder shall meet the following requirements: The frequency response shall be 5 Hz on lower side and 250 Hz or better

on upper side. Scan rate shall be 1000 Hz/Channel or better. Prefault time shall not be less than 100 milliseconds and the post fault

time shall not be less than 2 seconds (adjustable). If another system disturbance occurs during one post-fault run time, the recorder shall also be able to record the same. However, the total memory of acquisition unit shall not be less than 5.0 seconds.

b) The event logger shall meet the following requirements: The time resolution shall be 1milli second. Cope with up to 40 changes in any one 10milli seconds interval. The date and time should be printed to the nearest 1milli second followed

by a message describing the point which has operated. Events occurring whilst a previous event is in process of being printed are

to be stored to await printing. Xii) Display resolution of differential/pickup current should be 0.01A (10mA).


B) NON DIRECTIONAL THREE OVER CURRENT+ ONE EARTH FAULT PROTECTION WITH HIGH SET: The 3 O/C & 1 E/F elements shall be either independent or composite units. The relay shall be single pole inverse definite minimum time lag having definite min. time of 3 secs. at 10 times settings. Over current relay with a setting range of 50%-200% of 1 Amp. supplemented with high set units having a setting range of 500% to 2000% of 1 Amp. shall be provided. Earth fault relay with a setting range of 20%-80% of 1 Amp. supplemented with high set units having a setting range of 200% to 800% of 1 Amp. shall be provided. The relay shall be numerical type.

C) RESTRICTED EARTH FAULT PROTECTION : It shall be single pole type for the clearance of earth faults in the protected zone. The relay shall be of high impedance type with a suitable setting to cover at least 90% of the winding & shall have a setting range of 10% to 40% of 1 Amp. or suitable voltage setting. The relay shall be complete with tuned 50 Hz circuit & stabilizing resistance. The tuned circuit will help reject harmonics produced by CT saturation and thus make the relay operative for fundamental frequency only. The stabilizing resistance may appropriately be set to avoid mal-operation under through fault conditions. The relay shall be numerical type.

D) 8No. auxiliary relays for various transformer trip functions (Main Buch. Trip, OLTC Oil Temp. Trip, Winding Temperature Trip, Oil Temp Trip, Pressure Relief Trip, Surge Relay Trip and two no. spare) shall be provided.

E) OVER FLUXING PROTECTION: An over fluxing detecting relay for the protection of the transformer against over-fluxing conditions is proposed to be provided on each of the transformer C&R panels covered by this specification. The relay shall be numerical in design with adjustable setting so as to avoid its operation on momentary system disturbances. The relay shall be suitable for 110 Volts. The relay shall have inverse time characteristics, matching with transformer over-fluxing withstand capability curve. The relay shall provide an alarm with v/f setting range of 100% to 130% of rated values and time delay continuously settable from 0.1 to 6 seconds to draw the operator's attention about the existence of over-fluxing conditions. The tripping time shall be governed by v/f versus time characteristics to cause tripping of transformer controlling circuit breaker if the over-fluxing conditions continue to exist.

Note:- The over fluxing relay in built with the numerical differential protection relay is acceptable provided it meets the above specification.

F) OVER LOAD ALARM RELAY:

It is proposed to provide an over current (i.e. single phase) relay for initiating an alarm during transformer overload condition on the T/F C&R panels. The relay shall have CONTINUOUS VARIABLE setting range of 50-120% of 1Amp. and shall be supplemented by a continuously variable timer of 1 to 10 seconds. The relay shall be arranged to sound an alarm when the transformer exceeds the setting for a given period of time to draw the operator's attention.

Note:- The over load alarm relay in built with the numerical differential protection relay or Over current & Earth Fault Protection Relay is acceptable provided it meets the above specification.


5.14.2 PROTECTION SCHEME FOR LINES: A) MAIN- I NON-SWITCHED DISTANCE PROTECTION [FOR 220 kV LINES]: The scheme shall:-

i) be numerical & modular in construction. Relay shall have continuous self monitoring & diagnostic feature.

ii) have high speed non-switched distance relays for three phase systems to clear all type of line faults within the set reach of the relay.

iii) It should cover at least line sections completely with 20% in hand margin. iv) Measure all type of faults without the need to switch the measuring

elements to the faulty phase or phases. Zone switching to extend the reach of the measuring elements is not allowed. The reach of each zone shall be independently & individually adjustable and shall have setting in steps of 1%. Memory circuits with defined characteristics shall be provided in all three phases to ensure correct operation during close-up 3 phase faults and other adverse conditions.

v) have a max. operating time up-to trip impulse to circuit breaker (complete protection time including applicable carrier & trip relay time) under source to line impedance ratios (SIR) under all possible combinations of fault with PT being used on the line (with all filters included) at 50% of zone-1 reach :

for SIR 0.01-4:as 40 ms at nearest end & 60 ms at other end of line. for SIR 4-15 :as 45 ms at nearest end & 65 ms at other end of line.

(carrier transmission time is taken as 20 ms provided that any reduction in carrier time shall be directly reflected as reduction in maximum operating time).

vi) have stepped time-distance characteristics and shall have at least four independently variable time graded distance protection zones to cover two adjacent line sections out of which Zone-1, 2 & 3 should be selectable in forward direction and Zone-4 should be selectable in reverse direction.

vii) The relay shall have mho or quadrilateral or other suitably shaped characteristics for zone-1, 2, 3 & 4. The relay shall have an adjustable characteristics angle setting range of 30 - 85 degree or shall have independent resistance(R) & reactance(X) setting..

viii) ensure that this long coverage is consistent with limitations imposed by heavy loading and sound phase component of fault current. If the characteristics of starting relays are such that it cannot pick-up because of very low in-feed, under-voltage relays may also be used as supplementary relays.

ix) have two independent continuously variable time setting range of 0-3 seconds for zone-2 and 0-5 seconds for zone-3 & 4.

x) have a maximum resetting time of less than 35milli-seconds. xi) have facilities for offset features with adjustable 10-20% of Zone-3 setting. xii) have residual compensation variable from 30-150%. xiii) operate instantaneously when circuit breaker is closed to zero-volt 3 phase

fault. xiv) be suitable for single & three phase tripping. xv) have a continuous current rating of two times of rated current. The voltage

circuit shall be capable of operation at 1.2 times rated voltage. The relay shall also be capable of carrying a high short time current of 80 times rated current without damage for a period of 1 sec.

xvi) be selective between internal and external faults.


xvii) have adequate contacts to meet the complete scheme requirements & if required incorporate three separate high speed self reset trip relays for single phase faults and a fourth high speed trip relay for multi-phase faults.

xviii) have suitable number of potential free contacts. Multiplication relays, if required, shall be provided for Carrier aided features, Auto reclosing, Event Logger, Disturbance recorder & Data acquisition system.

xix) include power swing blocking protection which shall a1) be of triple pole type a2) have suitable setting range to encircle the distance protection described

above. a3) have a continuously adjustable time delay on pick up of setting range

0-2seconds. a4) block tripping during power swing conditions. a5) be of numerical type xx) include fuse failure protection which shall a1) monitor all the three fuses of PTs/CVTs and associated cable against open

circuit. a2) inhibit trip circuits on operation and initiate annunciation. a3) remain inoperative for system earth faults. a4) be of numerical type.

xxi) be wired for carrier inter-tripping (PUR/POR) & carrier blocking features selectable at site. xxii) be suitable for 1 Amp. rated CT secondary, 110V (phase to phase ) VT

supply and 220 V DC supply. Mode of conversation of DC supply from 220 V DC to the voltage level required for their scheme may be mentioned in detail. Requirement of CTs & VTs for the satisfactory working of the scheme may also be indicated in the tender.

xxiii) The relay shall be suitable for series compensated line and must have a current reversal guard feature.

xxiv) The Scheme shall have in-built features of broken conductor detection, distance to fault locator, disturbance recorder and event logger. For disturbance recorder and event logger features, it shall have 8 analog and 32 digital channels (out of which at least 16 shall be external digital inputs). It shall have its own time generator and the clock of the time generator shall be such that the drift is limited to +0.5 seconds/day, if allowed to run without synchronization. Further, it shall have facility to synchronize its time generator from Time Synchronization Equipment having output of following types.

Voltage signal: (0-5V continuously settable, with 50m Sec. minimum pulse duration)

Potential free contact (Minimum pulse duration of 50 m Sec.) IRIG-B RS232C

The recorder shall give alarm in case of absence of synchronizing pulse within specified time.

a) The disturbance recorder shall meet the following requirements: The frequency response shall be 5 Hz on lower side and 250 Hz or better

on upper side. Scan rate shall be 1000 Hz/Channel or better.


Prefault time shall not be less than 100 milliseconds and the post fault time shall not be less than 2 seconds (adjustable). If another system disturbance occurs during one post-fault run time, the recorder shall also be able to record the same. However, the total memory of acquisition unit shall not be less than 5.0 seconds.

b) The event logger shall meet the following requirements: The time resolution shall be 1 milli second. Cope with up to 40 changes in any one 10 milli seconds interval. The date and time should be printed to the nearest 1 milli second followed

by a message describing the point which has operated. Events occurring whilst a previous event is in process of being printed are

to be stored to await printing. Over 100 such events must be stored. c) The distance to fault locator shall meet the following requirements:

Be On-Line type and suitable for breaker operating time of 2 cycles. The display shall be directly in percent of line length or kilometers without

requiring any further calculations. Shall have an accuracy of 3% or better for the typical conditions defined for

operating timings measurement of distance relays. The above accuracy should not be impaired by presence of remote end infeed, predominant D.C. component in fault current, high fault arc resistance, severe CVT transients.

Shall have parallel line mutual zero sequence compensation feature.

B) MAIN -II NON-SWITCHED DISTANCE PROTECTION [FOR 220 kV LINES] :

For Main-II distance protection, scheme shall be numerical and shall have same features as that of Main-I protection against sub para 5.14.2 (A) above but with different measuring technique.

C) NON-SWITCHED DISTANCE PROTECTION SCHEME [FOR 132kV & 66kV LINES]:

The main protection scheme for these lines will be distance scheme working on definite distance measuring principle both for phase & earth faults. The scheme shall:- i) be numerical & modular in construction. Relay shall have continuous self

monitoring & diagnostic feature. ii) have high speed non-switched distance relays for three phase systems

to clear all type of line faults within the set reach of the relay. iii) It should cover at least line sections completely with 20% in hand margin.

iv) measure all type of faults without the need to switch the measuring elements to the faulty phase or phases. Zone switching to extend the reach of the measuring elements is not allowed. The reach of each zone shall be independently & individually adjustable and shall have setting in steps of 1%. Memory circuits with defined characteristics shall be provided in all three phases to ensure correct operation during close-up 3 phase faults and other adverse conditions.

v) have a max. operating time up-to trip impulse to circuit breaker (complete protection time including trip relay time) under source to line impedance ratios (SIR) :0.01-4 as 50ms under all possible combinations of fault at 50% of zone-1 reach.

vi) have stepped time-distance characteristics and shall have at least four independently variable time graded distance protection zones to cover two


adjacent line sections out of which Zone-1, 2 & 3 should be selectable in forward direction and Zone-4 should be selectable in reverse direction.

vii) The relay shall have mho or quadrilateral or other suitably shaped characteristics for zone-1, 2, 3 & 4. The relay shall have an adjustable characteristics angle setting range of 30 - 85 degree or shall have independent resistance(R) & reactance(X) setting.

viii) ensure that this long coverage is consistent with limitations imposed by heavy loading and sound phase component of fault current. If the characteristics of starting relays are such that it cannot pick-up because of very low in-feed, under-voltage relays may also be used as supplementary relays.

ix) have two independent continuously variable time setting range of 0-3 seconds for zone-2 and 0-5 seconds for zone-3 & 4.

x) have a maximum resetting time of less than 55milli-seconds (including the resetting time of trip relays).

xi) have facilities for offset features with adjustable 10-20% of Zone-3 setting. xii) For correct measurement of earth faults necessary equipment for residual

compensation shall be included. It shall have residual compensation variable from 30-150%.

xiii) operate instantaneously when circuit breaker is closed to zero-volt 3 phase fault.

xiv) be suitable for three phase tripping. xv) have a continuous current rating of two times of rated current. The voltage

circuit shall be capable of operation at 1.2 times rated voltage. The relay shall also be capable of carrying a high short time current of 80 times rated current without damage for a period of 1 sec.

xvi) have adequate contacts to meet the complete scheme requirements & if required incorporate separate high speed self reset trip relays.

xvii) have suitable number of potential free contacts. Multiplication relays, if required, shall be provided for Event Logger, Disturbance recorder & Data acquisition system.

xviii) include power swing blocking protection which shall

a1) be of triple pole type a2) have suitable setting range to encircle the distance protection described

above. a3) have a continuously adjustable time delay on pick up of setting range

0-2seconds. a4) block tripping during power swing conditions. a5) be of numerical type

xix) include fuse failure protection which shall a1) monitor all the three fuses of PTs/CVTs and associated cable against

open circuit. a2) inhibit trip circuits on operation and initiate annunciation. a3) remain inoperative for system earth faults. a4) be of numerical type.

xx) be suitable for 1 Amp. rated CT secondary, 110V (phase to phase ) VT supply and 220 V DC supply. Mode of conversation of DC supply from 220 V DC to the voltage level required for their scheme may be mentioned in


detail. Requirement of CTs & VTs for the satisfactory working of the scheme may also be indicated in the tender.

xxi) The Scheme shall have in-built features of broken conductor detection, distance to fault locator, disturbance recorder and event logger.

D) THREE OVER CURRENT+ ONE EARTH FAULT PROTECTION:

The 3 O/C & 1 E/F elements shall be either independent or composite units. It shall include VT fuse failure relays for alarm purposes.

DIRECTIONAL OVER CURRENT RELAY : The relay shall

i) have IDMTL characteristic with a definite minimum time of 3.0 seconds at 10 times setting.

ii) have a variable setting range of 50-200% of 1 Amp. iii) have a characteristic angle of 45 degree lead. iv) include operatio indicator. v) be suitable for 110V VT secondary. vi) be numerical type.

DIRECTIONAL EARTH FAULT RELAY: The relay shall

i) be numerical type. ii) have IDMTL characteristic with a definite minimum time of 3.0 seconds at

10 times setting. iii) have a variable setting range of 20-80% of 1 Amp. iv) have a characteristic angle of 45 degree lag. v) include operation indicator. vi) be suitable for connection across open delta formed by 110/3 volt rated

secondary of VT.

E) FEEDER OVER LOAD ALARM RELAY:

It is proposed to provide a single pole over current relay for the purpose of monitoring the load flow on feeders to sound an alarm whenever load flow in the line exceeds the setting for a given period of time to draw the operator's attention. The relay shall have CONTINUOUS VARIABLE setting range of 50-200% of 1 Amp. and shall be supplemented by a continuously variable timer of 1 to 10 seconds.

Note:- The Feeder over Load Alarm Relay in-built with numerical distance

protection relay or Over current & Earth Fault Protection Relay is acceptable provided it meets the above specification.

5.14.3 PROTECTION SCHEME FOR BUS COUPLER:

NON DIRECTIONAL THREE OVER CURRENT + ONE EARTH FAULT PROTECTION WITH HIGH SET:

The 3 O/C & 1 E/F elements shall be either independent or composite units. The relay shall be single pole inverse definite minimum time lag having definite min. time of 3secs. at 10 times settings. Over current relay with a setting range of 50%-200% of 1Amp. supplemented with high set units having a setting range of 500% to 2000% of 1Amp. shall be provided.


Earth fault relay with a setting range of 20%-80% of 1Amp. supplemented with high set units having a setting range of 200% to 800% of 1Amp. shall be provided. The relay shall be numerical type.

5.14.4 BUS BAR PROTECTION SCHEME: One bus bar protection scheme shall be provided for each main bus for 220kV having double bus arrangement. Bus bar protection scheme shall:-

i. be of numerical, low impedance type and modular in construction. The scheme shall be complete in all respects to cater the need of at-least 14 feeders/ bays.

ii. have maximum operating time up-to trip impulse to trip relay for all types of faults of 15milli seconds at 5 times setting value.

iii. operate selectively for each bus bar. iv. give hundred percent security up-to 40 kA fault level. v. incorporate check feature. vi. incorporate continuous supervision for CT secondaries against any possible

open circuit and if it occurs, shall tender the relevant zone of protection inoperative and initiate an alarm.

vii. not give false operation during normal load flow in bus bars. viii. incorporate clear zone indication. ix. be of phase segregated, triple pole type and provide independent zones of

protection for each bus. x. include necessary auxiliary relays for each circuit as required for the

scheme. xi. shall be biased differential type and shall have operate and restraint

characteristics. xii. be transient free in operation. xiii include continuous DC supply supervision for alarm and trip circuits

separately and provide separately non-trip alarm for B/B protection alarm circuit DC fail & B/B protection trip circuit DC fail conditions.

xiv. shall include necessary multi-tap auxiliary CTs for each bay. xv. include protection 'in/out' switch for each zone. xvi. include necessary CT switching relays. Also provide indication to monitor

`Operate' status of the CT switching relays with a common push button and shall have CT selection incomplete alarm with adequate time delay when proper CT switching has not taken place. CT switching relay should have adequate contacts for selection of trip bus instead of direct isolator contact.

xvii. bus bar protection scheme should cover the blind zone on account of single CT on B/C circuit.

xviii. Include high speed tripping relays for each bay. xix The Scheme shall have in-built features of disturbance recorder and event

logger. The disturbance recorder should record the disturbance data bay-wise (all bays phase and neutral current).

5.14.4.1 LOCAL BREAKER BACK UP PROTECTION SCHEME:

The relay shall be provided to take care of stuck breaker conditions. The local breaker back up protection scheme will under such conditions, immediately after the operation of primary / back up protection, transmit the tripping impulse to all the circuit breakers connected to that bus zone of which the circuit breaker forms part. The scheme shall be supplemented


with a timer suitable for station DC supply and continuously adjustable setting of .05 to .5 sec. on pick up.

The relay shall : i) be triple pole type with a setting range of 20% -80% of rated current. ii) have operating time of not more than 15 m-sec.

iii) have a resetting time of not more than 15 m-sec. iv) be of numerical type.

v) have a continuous thermal with stand of two times rated current irrespective of setting.

Note:- The LBB protection scheme in built with numerical bus bar protection scheme is acceptable provided it meets the above specification.

5.14.5 PROTECTION SCHEME FOR CAPACITOR C&R PANELS: A) NON DIRECTIONAL THREE OVER CURRENT+ ONE EARTH FAULT

PROTECTION WITH HIGH SET: The 3 O/C & 1 E/F elements shall be either independent or composite units. The relay shall be single pole inverse definite minimum time lag having definite min. time of 3 secs. at 10 times settings. Over current relay with a setting range of 50%-200% of 1 Amp. supplemented with high set units having a setting range of 500% to 2000% of 1 Amp. shall be provided. Earth fault relay with a setting range of 20%-80% of 1 Amp. supplemented with high set units having a setting range of 200% to 800% of 1 Amp. shall be provided. The relay shall be numerical type.

B) TIME DELAY RELAY:- A time delay relay must be included with adjustable setting range of 0-5 minutes to provide a time lag before which the bank shall not be again switched on (to avoid closing of the circuit breaker on a trapped charge).

C) UNDER VOLTAGE PROTECTION :- One inverse time under voltage relay having setting range of 50% to 90% of 110/3 volt (Phase-to-neutral) shall be provided to disconnect the capacitor bank under low voltage conditions.

D) OVER VOLTAGE PROTECTION :- One inverse time over voltage relay suitable for operation with 110/3 volt AC supply (Phase to neutral) with setting range of 100% to 130% shall be provided.

E) UNBALANCE PROTECTION :- The unbalance protection shall be provided through current unbalance relay connected to the NCT in neutral of capacitor bank connected in double star. Two such relays, one each for alarm & trip are required. The setting of the relay shall be 10% to 40% of the CT secondary (i.e. 1A for 132 kV& 66kV voltage levels and 5A for 33 kV voltage levels) followed by a time delay through a timer of 0.1 sec. for transient free operation of the protection. The relays shall be numerical type. The relay should not operate for healthy state spill current in neutral. Number of units of failure on which alarm shall come and tripping is initiated, be clearly mentioned for proper setting of the relays.

Note:- The under voltage Relay and over voltage relay in-built with numerical unbalance protection relay is acceptable provided it meets the above specification.


5.15 TRIPPING RELAY: High speed tripping relay shall

i) be instantaneous ( operating time not to exceed 10 milli-seconds.) ii) reset within 20 milli-seconds. iii) Be 220 Volt DC operated. iv) Have adequate contacts to meet the scheme requirement v) Be provided with operation indicators for each element/coil.

5.16 RELAY SETTINGS : The successful bidder will be responsible for calculating the relay setting of the protection schemes included in the bid and obtain HVPN's M&P wing clearance before their adoption. Any data\ information in regard to the power system required by the supplier for this purpose shall be supplied by HVPN.

5.17 TIME SYNCHRONISATION EQUIPMENT: i) The Time synchronisation equipment shall receive the co-coordinated

Universal Time (UTC) transmitted through Geo Positioning Satellite System (GPS) and synchronize equipments to the Indian Standard Time in a substation.

ii) Time synchronisation equipment shall include antenna, all special cables and processing equipment etc.

iii) It shall be compatible for synchronisation of Event Loggers, Disturbance recorders and SCADA at a substation through individual port or through Ethernet realized through optic fibre bus.

iv) The synchronisation equipment shall have 2 micro second accuracy. Equipment shall give real time corresponding to IST (taking into consideration all factors like voltage & temperature variations, propagation & processing delays etc).

v) Equipment shall meet the requirement of IEC 60255 for storage & operation.

vi) The system shall be able to track the satellites to ensure no interruption of Synchronisation signal.

vii) The output signal from each port shall be programmable at site for either one hour, half hour, minute or second pulse, as per requirement.

viii) The equipment offered shall have six (6) output ports. Various combinations of output ports shall be selected by the customer, during detailed engineering, from the following:

Voltage signal : Normally 0-5V with 50milli Seconds minimum pulse duration. In case any other voltage signal required, it shall be decided during detailed engineering.

Potential free contact (Minimum pulse duration of 50milli Seconds.) IRIG-B RS232C

ix) The equipment shall have a periodic time correction facility of one second periodicity.

x) Time synchronisation equipment shall be suitable to operate from 220V DC as available at Substation.

xi) Equipment shall have real time digital display in hour, minute, second (24 hour mode) & have a separate time display unit to be mounted on the top of control panels having display size of approx. 100 mm height.


5.18. SMALL WIRING : a) All wiring shall be of switch board type consisting of stranded /single

annealed copper conductor insulated with polyvinyl chloride insulation suitable for 650 volts service and in accordance with IS : 694.

b) The wiring of the following circuits shall not be less than the size specified below:

CTs, PTs & CVTs circuits : 2.5 mm2 Control, alarm & supervision circuits etc. : 1.5 mm2 c) All wires will be continuous from one terminal to the other and also will have

no tee - junction en-route. The connections shall be securely made with the help of connecting lugs to ensure non-oxidation of the bare copper conductor. At the terminal connections, washers shall be interposed between stud type terminals and holding nuts. All holding nuts shall be secured by locking nuts. The connection studs shall project at least 6 mm from the lock nut surface.

d) Bus wires shall be fully insulated and run separately. MCBs shall be provided to enable all the circuits in a panel to be isolated from the bus wire. Wherever practicable, all circuits in which the voltage exceeds 125 volts shall be kept physically separated from the remaining wiring. The function of each circuit shall be marked on the associated terminal boards.

e) All wiring diagrams for the control and relay boards shall be drawn as viewed from the back of the cubicle and shall be in accordance with IS:375 or equivalent IEC. Multi core cable tails shall be so bound to its cable that each wire may be traced without difficulty.

f) All potential bus wiring, non-trip and trip alarm bus wiring, AC & DC control supply, panel lighting bus wires and such other wiring which runs from panel to panel within a C&R panel board shall be laid out in gutters and shall be suitably screened. In case of `simplex' type C&R boards these common wires will run through bus wire holes.

5.19. TERMINAL BOARDS, TEST BLOCKS & SPARE CONTACTS: a) Terminal block connectors built from cells of moulded dielectric and brass

stud inserts shall be provided for terminating the outgoing ends of the panel wiring and the corresponding tail ends of control cables. Insulating barriers shall be provided between adjacent connections. The height of the barriers and the spacing between terminals shall be such as to give adequate protection while allowing easy access to terminals. Provision shall be made on each pillar for holding 10% extra connectors.

b) The terminal blocks shall be suitable for 650 Volts service and for connection with both copper and aluminum wires.

c) Terminal boards shall be mounted in such a manner as to afford easy access to terminations and to enable ferrule numbers to be read without difficulty. Wire ends shall be so connected at the terminals that no wire terminal gets marked due to succeeding connections. Terminal board rows shall be adequately spaced and shall not be less than 100 mm apart so as to permit convenient access to wires and terminations. Labels in the form of engraved plastic plates shall be provided on the fixed portion of terminal boards. No live metal parts shall be exposed at the back of terminal boards.


d) Switch board type back connected test block with contacts shall be provided with links or other devices for shorting terminals of CT leads before interrupting the normal circuit for injection from an external source or for inserting testing instruments in the circuit without causing open circuit of the CT. The potential testing studs shall preferably be housed in narrow recesses of the block, wherever required, shall be placed as close to the equipments as possible. Test blocks shall be of flush mounting pattern and the number of test blocks being provided on each control and relay panel shall be stated in the tender.

e) The purpose of all the relays (including the auxiliary relays) switches, lamps & push buttons etc. is required to be indicated just below the respective equipment through engraving or painting.

f) Spare contacts of relays are required to be brought on T.B's and shall be indicated on the drawings.

5.20. BUS WIRES: The VT, DC, AC, trip alarm , non-trip alarm & DC fail etc. inter panel bus wire

terminals shall be brought on Bus T.B's as well as on T.B's so that any panel specified herein can be used separately at the Substation specified in this specification. The said bus wires for the panels specified in case of existing substations shall be matched with the bus wires of the C&R panels already available at site, the drawing for matching purposes for which shall be supplied to the successful bidder. The bus wire terminals shall be indicated on the panel schematic drawings as well. The bus wire diagram shall also be supplied alongwith the schematic drawings for each panel.

5.21. FERRULES : Wire No. shall be indicated on panel schematic and wiring diagrams and

accordingly engraved ferrules with the same numbers and letters as indicated in the said diagrams shall be provided on the terminal ends of all wires for easy identification of circuits for inspection and maintenance. Ferrules shall be of strong & flexible insulating material with glossy finish to prevent adhesion. These shall be engraved and marked clearly and shall not be affected by dampness. Ferrule numbering shall be in accordance with IS: 375. The same ferrule number shall not be used on wires in different circuits on a panel. At those points of interconnection between the wiring carried for equipments of different suppliers where a change of number cannot be avoided double ferrules shall be provided on each wire with the appropriate connection diagram of the equipment.

5.22. SPACE HEATERS: Tubular space heaters suitable for connection to the single phase 220 Volts AC

supply complete with switches located at convenient positions shall be provided at the bottom of each control and relay panel to prevent condensation of moisture. The watt loss per unit surface of heater shall be low enough to keep surface temperature well below visible heat.

5.23. ILLUMINATION:

The C&R panel shall be provided with 220/240 Volts AC interior lighting. The lamp shall be free from hand shadows. A door operated button switch shall be provided in each simplex panel. Each simplex panel shall be provided with one no. illumination lamp with door switch.


5.24 POWER SOCKET : Single phase 240 volt AC, 5-Pin, 5/15A power socket with power on/off switch shall be provided in each simplex panel.

5.25 SAFETY EARTHING: Earthing of current free metallic parts or metallic bodies of the equipment mounted

on the switch boards shall be done with bare copper conductor. Copper bus of size 25 mm x 6 mm extending through entire length of a control and relay board shall be provided. The earthing conductor shall be connected by Rose Courtney terminals and clamp junctions.

The neutral point of star connected secondary windings of instrument transformers and one corner of the open delta connected LV side of potential transformer, if used shall be similarly earthed with the main earth bar of the switch board earthing system. Multiple earthing of any instrument transformer shall be avoided. An electrostatic discharge point shall be provided in each panel connected to earth bus via 1 Mega Ohm resistor.

5.26 NAME PLATE: An easily accessible engraved or painted panel name plate shall be provided

inside each panel. It must include G.A. drawing No., purchase order No., Contractor's reference No., name of S/Stn. as per purchase order and name of circuit. In addition to this, an engraved plate indicating the purchase order no. alongwith name of S/Stn. is required to be affixed on the panel at appropriate height so that it is readable while standing in front of the panel. These are required to be indicated on the G.A. drawings also. An engraved label indicating the purpose of all the relays & switches shall also be provided.

5.27 PANEL DETAILS: The mountings on various 220 kV, 132kV, 66kV & 33kV C&R panels against

various Substations specified herein shall be as under. The bidders shall give the details of the various panel mountings in the same serial as specified herein as under for the convenience of checking of the same w.r.t. the provision in the specification. Any trip relay, auxiliary relay, timers, contact multiplication relay, ICT, IVT & test block etc. required for the completeness of the scheme shall be added by the Bidder as per scheme requirements and no cost addition on these accounts shall be considered at a later date.

The following is the general criteria for the selection of the equipments to be provided in each type of panel.

(A) LINE PROTECTION PANEL Each Line Protection panel for transmission lines shall consist of following: Sl. No. Description 220kV 132/66kV 33kV 1. Main-1 Numerical Distance protection Scheme 1 Set 1 Set NIL 2. Main-2 Numerical Distance protection Scheme 1 Set NIL NIL 3. Directional back up Over-current and

E/F protection scheme 1Set 1 Set 1 Set(with high set)

4. Overload alarm scheme 1Set 1 Set 1set 5. 3 phase Trip Relays 2 Nos. 2 Nos. 1 Nos 6. Voltage selection scheme 1 set 1 set 1 set


8. Flag relays , carrier receive relays ,aux. Relays, timers etc as per scheme Requirements Lot Lot Lot 9. Under Voltage relay for isolator/earth Switch 2 Nos 2 Nos 2 Nos

(B) TRANSFORMER PROTECTION PANEL Each protection panel for Transformer shall consist of the following: Sl.No. Description HV side MV/LVside 1. Transformer Differential Protection scheme 1 Set Nil 2. Restricted Earth fault protection scheme 1 Set 1Set@ @ Not applicable for autotransformer 3. Non-Directional back up O/C and E/F scheme with high set feature 1 set 1 set 4. Over Fluxing Protection scheme 1 Set. NIL 5. Overload alarm scheme 1 Set NIL 6. Three phase trip relays 2 nos. 2 nos. 7. Voltage selection scheme 1 set 1 set 8. Flag relays ,aux .relays, timers etc as per scheme requirement including transformer alarms and trip functions Lot Lot

(C) BREAKER RELAY PANEL for 220kV Voltage Level Each breaker relay panel shall consist of the following: Sl.No. Description With A/R With out A/R 1. LBB Protection Scheme 1 set 1 set 2. DC supply Supervision scheme 1 set 1 set 3. Trip Circuit supervision relays 6 Nos. 6 Nos. 4. Autoreclose scheme with check synchronising and dead line charging scheme 1 set NIL 5. Flag relays, aux relays, timers, trip relays as per scheme requirements Lot Lot

(D) BREAKER RELAY PANEL for 132kV, 66kV and 33kV Voltage Levels Each breaker relay panel shall consist of the following: Sl.No. Description With out A/R 1. DC supply Supervision scheme 1 set 2. Trip Circuit supervision relays# 2 Nos.

# Trip supervision relays shall be 1No. for each 33KV Line and Capacitor Circuit breakers.

3. Flag relays, aux relays, timers, trip relays as per scheme requirements Lot

4. Special Energy Meter(Main) as per Interutility 1 No.* Metering System Specification No.

HPD/S-59R/HPM-461/Vol-II/Prot (July, 2010) * applicable only for 33kV T/F I/C Panels

(E) BUS COUPLER PROTECTION PANEL Each bus coupler Protection panel shall consist of following: Sl. No. Description 220kV 132/66/33kV 1. Non-Directional Overcurrent and E/F protection scheme with Highset 1Set 1 Set


2. 3 phase Trip Relays 2 Nos. 1 Nos. 3. Flag relays , aux.Relays timers etc as per scheme Requirements Lot Lot (F) BUS BAR PROTECTION PANEL The bus bar Protection panel shall consist of following: Sl. No. Description 220kV 1. Complete bus bar protection scheme as Per clause 5.14.4 above 1Set (G) CAPACITOR PROTECTION PANEL Each capacitor Protection panel shall consist of following: Sl. No. Description 33kV 1. Neutral Unbalance protection Scheme 2 Set 2. Over Voltage Protection Scheme 1 Set 3. Under Voltage Protection Scheme 1 Set 4. Non Directional Overcurrent and E/F

protection scheme with high set 1 Set 5. Time Delay relay 1 Set 6. 3 phase Trip Relays 1 Nos 7. Voltage selection scheme 1 set 8. Flag relays, aux. Relays, timers etc as per scheme Requirements Lot 9. Under Voltage relay for isolator/earth Switch 2 Nos Note:- The CT secondary current is 5A for 11kV & 33kV in all panels.

6.0 TESTS :

6.1 TYPE TESTS : The equipment offered should be type tested. Type test report of similar

equipment should not be more than seven years old, reckoned from the date of bid opening, in respect of the following tests, carried out in accordance with ISS-3231(1965)/equivalent IEC from Govt./ Govt. approved test house & shall be submitted along with bid: a) Insulation tests as per IEC 60255-5 b) High frequency disturbance test as per IEC 60255-4 (Appendix -E) -Class

III (not applicable for electromechanical relays) c) Fast transient test as per IEC 1000-4, Level-III (not applicable for

electromechanical relays) d) Relay characteristics, performance and accuracy test as per IEC 60255.

e) Tests for thermal and mechanical requirements as per IEC 60255-6 f) Tests for rated burden as per IEC 60255-6 g) Contact performance test as per IEC 60255-0-20 h) Conformance tests as per IEC 61850

The above tests shall be supplied for distance protection, over current and earth fault protection, restricted earth fault protection, Bus bar protection and


transformer differential protection as per the applicability of the relay alongwith bid.

The remaining type test reports of above relays & all the type test reports of remaining relays and type test reports of meters shall be submitted by the successful bidder within three months of placement of order. These type test reports will also be from Govt./ Govt. approved test house & should not be more than seven years old, reckoned from the date of placement of order. The failure to do so will be considered as a breach of contract.

6.2 ROUTINE TESTS: 6.2.1 All equipment shall be subject to routine tests according to the relevant standards

/ Quality Assurance Program (QAP) and to such other tests as may be required to ensure that all equipment is satisfactory and in accordance with this specification. The Purchaser reserves the right to witness all the tests, unless dispensed with in writing by the Purchaser.

6.3 ACCEPTANCE TESTS: 6.3.1 The Supplier shall give sufficient advance intimation (at least 15 days notice for

Indian Supplier and 30 days notice for Foreign Supplier) to the Purchaser to enable him to depute his representative for witnessing the tests. Following tests shall be carried out at the manufacturer's works after complete assembly:-

i) Checking wiring of circuits and their continuity. ii) One minute high voltage test. iii) Insulation resistance of complete wiring, circuit by circuit with all equipment

mounted on the panel. iv) Checking the operation of protection schemes. 7.0 DOCUMENTATION: 7.1 All drawings shall conform to international standards organization (ISO) `A' series

of drawing sheet/Indian Standards Specification IS: 11065. All drawings shall be in ink and suitable for microfilming. If drawings are computerized than all drawings shall be nicely printed. All dimensions and data shall be in S.I.Units.

7.2 The successful Supplier shall submit four sets of G.A. and schematic drawings for Purchaser's approval within two weeks of the date of placement of order. The Purchaser shall communicate his comments/approval on the drawings to the Supplier within four weeks of the date of receipt of above drawings. The Supplier shall, if necessary, modify the drawings and resubmit four copies of the modified drawings for Purchaser's approval within two weeks from the date of Purchaser's comments. After receipt of Purchaser's approval, the Supplier shall submit 10 prints of final drawings for each Item/Circuit and one good quality soft copy (CD) of the following drawings and instruction manuals :-

i) Board-wise arrangement drawing (applicable for the panel board at a Substation having more than one panel).

ii) G.A. drawing alongwith G.A. legend and foundation details. iii) Schematic drawings alongwith legend & internal wiring details of main

relays like transformer differential relay, REF relay, and local breaker back up schemes, distance protection scheme, bus-bar protection scheme, voltage selection scheme etc.

iv) Equipment-wise & wire-wise wiring diagrams.


Each set of drawings shall be bound separately. The final documents shall be supplied before despatch of equipment.

7.3 The manufacturing of the equipment shall be strictly in accordance with approved drawings and no deviation shall be permitted without the written approval of the Purchaser. All manufacturing & fabrication work in connection with the equipment prior to the approval of the drawings shall be at the Supplier's risk.

7.4 The Supplier shall furnish specified no. of nicely printed and bound volumes of the instruction manuals in English language, prior to the despatch of the equipment. The instruction manual shall contain step by step instructions for all operational & maintenance requirements for all the protective and aux. relays, switches, instruments etc. mounted on the panel and shall include the following aspects.

i) Storage for prolonged duration. ii) Unpacking. iii) Erection. iv) Handling at site. v) Pre commissioning tests. vi) Operating procedures. vii) Maintenance procedure. viii) Precautions to be taken during operation & maintenance work.

ix) Catalogue numbers of all the components liable to be replaced during the life of the panels.

x) Internal wiring diagrams of all the relays. 7.5 Ten (10) copies of instruction manuals for each Circuit/Item shall be supplied free

of cost before despatch of equipment. Each set of instruction manuals shall be bound separately. One master set for all the Circuits/Items shall be supplied with in a week of placement of order to the Design Directorate to facilitate the checking and approval of drawings.

7.6 Approval of drawings by Purchaser shall not relieve the Supplier of his responsibility and liability for ensuring correctness & correct interpretation of the latest revision of applicable standards, rules & codes of practices. The equipment shall conform in all respects to high standards of engineering, design, workmanship and latest revisions of relevant standards at the time of ordering.

NOTE:- In case the equipment offered by the Supplier does not meet with the

requirements of technical specification, the offer of the firm shall not be considered.


ANNEXURE -A GUARANTED TECHNICAL PARTICULARS

CONTROL AND RELAY PANEL BOARDS FOR SUBSTATIONS WITH SUBSTATION AUTOMATION SYSTEM

I. PANELS.

1. Dimension of the C&R panels. i) Depth ii) Overall height

2. Dimension of supporting channel. 3. Thickness of the sheet steel proposed

for fabrication of panels. II. SWITCH BOARD WIRING.

1. Insulation of wiring. 2. Material of wiring conductor. 3. Size of wiring conductor for:

i) C.T. Circuits. ii) C.V.T./P.T. Circuits.

iii) D.C. supply circuits. iv) A.C. Supply Circuit. v) Other circuits.

4. Size of earthing bar for safety earthing.

5. Type of terminals used in wiring the panel.

III. CONTROL SWITCHES FOR CIRCUIT

BREAKER & ISOLATORS. 1. Make. 2. Type. 3. Type of handle provided. 4. Number of position . 5. Whether no. of Normally closed &

Normally open contacts sufficient for seheme requirements? (Yes / No).

6. Whether spring return to neutral or stay-put type.

7. Type of lock provided. 8. Making capacity/breaking capacity at

220 Volt DC for both inductive & non-inductive current.

9. Descriptive leaflet number submitted. IV. OVER CURRENT & EARTH FAULT RELAY. 1. Make.

2. Type of relay. 3. Current coil rating. 4. Potential coil rating (applicable only

in case of directional relays). 5. Tap range. 6. Range of high set elements (wherever applicable).


7. VA burden. a) Highest tap. b) Lowest tap.

8. Time V/S current characteristics. 9. Trip contact rating. 10. Descriptive leaflet No. submitted.

V. AUXILIARY RELAYS.

1. Make. 2. Type. 3. Capacity of contacts:

i) Continuously. ii) for 3 seconds.

4. Operating coil VA burden. 5. Voltage operated or current operated. 6. No. of Normally closed & Normally open

contacts sufficient for scheme requirements (Yes / No).

7. Contacts hand or self reset type. 8. Descriptive leaflet number submitted.

VI. TRANSFORMER DIFFERENTIAL RELAY. 1. Make. 2. Type.

3. Minimum differential current at which relay operations.

4. Range & steps of bias setting. 5. Operating time at twice the relay

setting. 6. VA burden of the relay. 7. Descriptive leaflet No. submitted.

VII. TRIP CIRCUIT SUPERVISION RELAY.

1. Make. 2. Type 3. Rating 4. Minimum voltage for satisfactory

operation (% of rated voltage). 5. Monitoring of breaker trip coil in both

close & open position provided. 6. Safety resistors provided to limit

the current if the relay coil is short-circuited. 7. No. of Normally closed & Normally open

contacts sufficient for seheme requirements (Yes / No).

VIII. RESTRICTED EARTH FAULT RELAY .

1. Make. 2. Type. 3. Tap range. 4. Timer setting range. 5. V A Burden. 6. Time/Current characteristics 7. Short time rating of relay. 8. Descriptive leaflet No. submitted.


IX. T/F OVER FLUXING RELAY. 1. Make

2. Type. 3. Rated Voltage (V,AC) 4. Rated DC Voltage. 5. Operating principle. 6. No. of Normally closed & Normally open


7. Contacts self/hand reset. 8. Burden. 9. Setting range. i) V/F

ii) Time for alarm. iii) Time for tripping.

10. Whether inverse time operating characteristics provided.

11. Whether different time multiplier settings provided.

12. Max. operating time of the relay at i) 1.4 times the rated value of V/F. ii) 1.25 times the rated value of V/F.

13. Reset time. X. LOCAL BREAKER BACK UP RELAYS .

1. Make. 2. Type. 3. Setting range (% of rating)

a) Phase faults. b) Ground faults.

4. Operating time (m sec.) 5. Reset time (m sec). 6. Burden. 7. Timer range. 8. Whether no. of Normally closed &

Normally open contacts sufficient for seheme requirements? (Yes / No). XI. OVER LOAD ALARM RELAY.

1. Make. 2. Type. 3. Rated Voltage. 4. Setting Ranges. 5. Operating time. 6. Setting range continuously variable.

XII. SELECTOR SWITCHES (AUTO-

RECLOSING IN/OUT, CARRIER PROTECTION IN/OUT SWITCH,

TRIP TRANSFER SWITCH). 1. Make.

2. Type. 3. Type of handle.


4. No. of positions. 5. No. of Normally closed & Normally open


6. Making & breaking capacity of contacts.

7. Descriptive leaflet number submitted.

XIII. DISTANCE RELAYS. 1. Make. 2. Type of relay. 3. Type of distance measuring elements. 4. Details of starting units and their

switching sequence, if applicable. 5. Range of settings (in secondary ohms).

for Zone-I, Zone-2 & Zone-3. 6. Operating times:

i) First zone timing. ii) Second zone time setting

adjustable between-------- secs to ------- secs.

iii) Third zone time setting adjustable between -------- secs to ------- secs.

7, Contacts rating: i) First Zone.

ii) Second Zone. iii) Third Zone.

8. VA burden : i) Current circuit of the scheme.

ii) Potential circuit of the scheme. 9 Is the VA burden at Sr.No.8 above is

continuous ? (yes/No) 10. Operating time versus ZS/ZL curves

of the distance scheme. 11. Descriptive leaflet no. submitted.

XIV. CHECK SYNCHRONIZING RELAY: 1. Make. 2. Type.

3. Rating ( V, ac ) 4. Aux. Voltage ( V, dc ) 5. Permissible voltage difference (%) 6. Permissible phase angle difference (degree) 7. Response time of relay (without timer)( m Sec )

XV. AUTO RECLOSING : 1. Make. 2. Type. 3. Multi shot or single shot. 4. Rating (V, dc) 5. Suitable for 1 & 3 phase. 6. Dead time setting range (Sec.) 7. Reclaim time setting range (sec.) 8. Four position selector switch provided.


9. Alarm contacts provided for `Auto-reclosed', `Reclosure unsuccessful'. XVI. BUS-BAR PROTECTION 1. Make.

2. Type. 3. Applicable standard. 4. Rated Voltage/Frequency. 5. Operating time (maximum). 6. Resetting time (maximum). 7. Does the offer meet the Yes/No

requirements of technical specification?


ANNEXURE B

TECHNICAL PARTICULARS OF CTs, PTs, CVTs & NCTs.

COREWISE DETAILS OF 245kV Transformer CTs

(300-150/.577-1-1-1-1A)

NUMBER OF CORES - 5 Core No.

Application Current Ratio (A)

Output burden(VA)

Accuracy class as per IEC 185

Formula for minimum knee-point voltage At CT Secondary resistance at 750C at 300A tap (Volt)

Maximum Exciting Current (mA)

I.S.F./ A.L.F

1 2 3 4 5 6 7 8 1 DIFFERENTIAL

PROTECTION 300-150/ 0.577

- PS 40 (RCT+2) 30ATVk/4 -

2 REF PROTECTION 300-150/1 - PS 14 (RCT+2) 30ATVk/2 - 3 OVER CURRENT

PROTECTION 300-150/1 25 5P - - 10

4 BUSBAR PROTECTION (FOR LOW IMPEDANCE SCHEME)

300-150/1 - PS 40 (RCT+4) 30ATVk/2 -

5 METERING 300-150/1 25 1.0 - -

COREWISE DETAILS OF 245kV LINE CUM BUS-COUPLER CTs

(1200-800-400/1-1-1-1-1 A)

NUMBER OF CORES 5

Core No.


Output burden (VA)


Formula for minimum knee point voltage At CT Secondary resistance at 750C at 800Atap (Volt)

MaximumExciting Current (mA)

InstrumentSecurity factor

1 2 3 4 5 6 7 8 1. MAINI

DISTANCE PROTECTION

1200-800-400/1

- PS 80(RCT+9) 80AT Vk -

2. MAINII DISTANCE PROTECTION

1200-800-400/1

- PS 80(RCT+9) 80AT Vk -

3. BUS DIFFERENTIAL MAIN

1200-800-400/1

- PS 100(RCT+4) 30AT Vk/2 -

4. BUS DIFFERENTIAL CHECK

1200-800-400/1

- PS 100(RCT+4) 30AT Vk/2 -

5. METERING 1200-800-400/1

40 0.2S - - ISF

COREWISE DETAILS OF 245kV NEUTRAL CTs

(300-150/1A)

NUMBER OF CORE - 1

Application Current

Ratio (A) Accuracy class as per IEC 185

Formula for minimum knee-point voltage at CT Secondary resistance at 750C at 300Atap(Volt)


Minimum Insulation Voltage (kV)

1 2 3 4 5 6 REF PROTECTION

300-150/1 PS 14(RCT+2) 30AT VK/2

33

COREWISE DETAILS OF 145kV TRANSFORMER INCOMER CT

(500-250/.577-1-1-1A)

NUMBER OF CORES 4

Core No.


Output burden (VA)

Accuracy Class as per IEC 185

Formula for minimum knee-point voltage At CT Secondary resistance at 750C at 500Atap (Volt)


I.S.F./A.L.F.

1 2 3 4 5 6 7 8 1. DIFFERENTIAL

PROTECTION 500-250/

0.577 - PS 40 (RCT+2) 30AT Vk/4 -

2. REF PROTECTION

500-250/1 - PS 90 (RCT+2) 37.5AT Vk/2 -

3. OVER CURRENT ANDEARTH FAULTPROTECTION

500-250/1 25 5P - - ALF10

4. METERING 500-250/1 25 1.0 - - ISF

COREWISE DETAILS OF 145kV LINE/BUS COUPLER CT

(600-300-150/1-1-1A)

No. OF CORES = 3

Core No.


Output burden(VA)

Accuracy classas per IEC 185

Formula for minimum knee-point voltage At CT Secondary resistance at 750C at 300Atap (Volt)


A.L.F./I.S.F.

1 2 3 4 5 6 7 8 1 DISTANCE

PROTECTION 600-300-150/1 - PS 120 (RCT+4.5)

80AT VKP -

2 OVER-CURRENT

& EARTH FAULT PROTECTION

600-300-150/1 25 5P - - ALF 10

3 METERING 600-300-150/1 25 0.2S - - ISF

COREWISE DETAILS OF 72.5kV TRANSFORMER INCOMER CT

(1000-500/.577-1-1-1A)

NUMBER OF CORES - 4

Core No.


Output burden

(VA)

Accuracy class

as per IEC 185



A.L.F./I.S.F.

1 2 3 4 5 6 7 8 1 DIFFERENTIA

L PROTECTION

1000-500/0.577 - PS 40 (RCT+2)

30AT VK/4 -

2 REF PROTECTION

1000-500/1 - PS 14 (RCT+2) 30AT VK/2

3 OVER CURRENT & EARTH FAULT PROTECTION

1000-500/1 15 5P - - ALF 10

4 METERING 1000-500/1 15 1.0 - - ISF

COREWISE DETAILS OF 72.5kV TRANSFORMER CT FOR 25/31.5 MVA T/F

(300-150/.577-1-1)

No. OF CORES = 3 Core No.


Output burden(VA)




A.L.F


PROTECTION 300-150/0.577 - PS 40(RCT+1)

30AT VK/4 -

2 REF PROTECTION 300-150/1 - PS 20(RCT+1)

30AT VK/2 -

3 OVER CURRENT PROTECTION

300-150/1 25 5P - - 10

COREWISE DETAILS OF 72.5kV TRANSFORMER CT FOR 12.5/16 MVA & 16/20 MVA T/F

(200-150/.577-1-1A)

No. OF CORES = 3 Core No.


Output burden(VA)




A.L.F


PROTECTION 200-150/0.577 - PS 40(RCT+1)

30AT VK/4 -

2 REF PROTECTION 200-150/1 - PS 20(RCT+1)

30AT VK/2 -

3 OVER CURRENT PROTECTION

200-150/1 25 5P - - 10


COREWISE DETAILS OF 72.5kV LINE/BUS COUPLER CT

(600-300-150/1-1-1A)

No. OF CORES = 3

Core No.


Output burden(VA)


Formula for minimum knee point voltage At CT Secondary resistance at 750C at 300A tap (Volt)


A.L.F./ I.S.F.

1 2 3 4 5 6 7 8 1 DISTANCE

PROTECTION 600-300-150/1 - PS 110

(RCT+11) 80ATVKP -

2 OVER

CURRENT & EARTH FAULT PROTECTION

600-300-150/1 15 5P - - ALF 10

3 METERING 600-300-150/1 20 0.2S - - ISF

COREWISE DETAILS OF 72.5kV NEUTRAL CT FOR 12.5/16 MVA & 16/20 MVA T/F

(200-150/1)

No. OF CORE= 1

Core No.


Output burden(VA)




Minimum Insulation Voltage (kV)

1 2 3 4 5 6 7 8 1 REF

PROTECTION 200-150/1 - PS 20 (RCT+1)

30AT VK/2 15

COREWISE DETAILS OF 36kV TRANSFORMER INCOMER CT FOR 132/33KV WITH 26.3KA STC

(600-400-300/.577-5-5-1)

No. OF CORES = 4

Core No.


Output burden(VA)

Accuracy class as Per IEC 185


MaximumExciting Current (ma)

A.L.F./ I.S.F.

1 2 3 4 5 6 7 8 1 DIFFER

111_nC&R Panel (with automation)-MARCH,2011 (R1)

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