NSL_Technical Specification for Electrical Package

8/10/2019 NSL_Technical Specification for Electrical Package

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TECHNICAL SPECIFICATION FOR ELECTRICAL PACKAGE

Document ID JS0012 75650100-SPC-001 Revision: 00

Item Code ELE-001Description ELECTRICAL PACKAGE

26.11.2010

TABLE OF CONTENTS

CHAPTER TITLE

1 DESIGN BASIS

2 APPLICABLE STANDARDS

3 SCOPE OF SUPPLY

4 TERMINAL POINTS

5 EXCLUSIONS

6 SPECIFICATION

6.1 Switchyard

6.2 Transformers (PT, DT & CT)

6.3 11 KV SWITCH BOARD

6.4 LT PCC AND MCC

6.5 BATTERY AND BATTERY CHARGER

6.6 Segregated Phase Busduct

6 7 LT BUS DUCTS


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6.9 Illumination System

6.10 EARTHING AND LIGHTNING PROTECTION

6.11 Cable trays & Supports

7 Erection & Commissioning

8 Field testing and Commissioning

9 LIST OF DRAWING & DOCUMENTS

10 APPROVED VENDOR LIST

11 LIST OF SPARES

12 DRIVE LIST

13 SINGLE LINE DIAGRAM (JS0012-75650000-SLD-005 / Rev. 0)

14 OVER ALL PLOT PLAN (JS0012-75990100-LYT-001, REV-00)


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CHAPTER - 1

DESIGN BASIS

The vendor to take care of the following site details while offering theELECTRICAL package and also during the detail design in case if the order isawarded.

S.No. Description Unit

A Site details

1. Project Title M/s. NSL Sugars Ltd

2. EPC contractor ISGEC JOHN THOMPSON.

3. Consultant M/s. MITCON Consultancy Services

4. Plant LocationBhusanoor Village, Tq.AllandDistt. Gulbarga, Karnataka.

5. Power Plant Capacity MW 35 CO-GENERATION PLANT

6. Seismic Co-efficient zone Zone II as per IS 1893

7.Wind

(a) Design Wind Velocitym/s 39 m/s as per IS 875

B Meteorological data

8.Ambient Temperature:(Min. / Max. / Average)

C 20 / 50 / 30 (Performance)

9. Relative Humidity :Performance/Design / Max / Min

% 58 85 % (60% for Performance)

Wet Bulb Temperature :


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13. Nearest Airport

14.Motorable Road (National /State High

way)

15. Nearest harbor

16. Design Temperature for Electrical

equipments

C50

DESIGN BASIS & PHILOSOPHY

1.1 Electrical system

The power generated will be evacuated to the sugar mill at the given terminalpoints. All the cogeneration power plant auxiliaries will operate on the powersupplied from the cogeneration power plant. Balance of power generated aftermeeting the sugar and auxiliary load will be exported to the grid after stepping

up to 110 kV. DG set will be provided for emergency power & start up powerduring grid failure. All other power sources including DC power, UPS, controlpower, lighting, etc. will be derived from the cogeneration panels. Requiredearthing will be provided to ensure safety.

Proposed synchronous alternator shall be of 35 MW rating with generation at 11kV. Surplus power, after meeting the cogeneration plant auxiliary requirementand power requirement of the sugar plant, shall be exported to the grid

through 34/42.5MVA, 11/110 kV, ONAN/ONAF, OLTC, Bi-Directional Powertransformer. The Power transformer shall be suitable for exporting themaximum power at 110 kV, without any limitation in the plant operation andpower export as well as power import.

All equipment shall be designed to withstand the maximum fault levels


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level of voltage, motor starting analysis and stability study of the plant withKPTCL grid.

Power system shall be designed so as to export the entire power from

cogeneration plant (total generation less auxiliary power consumption), whenthe sugar plant is not in operation.

Plant lighting shall be in accordance with llumination System mentionedelsewhere in specification.

Earthing arrangement in 110 KV switchyard shall be strictly as per the statutoryregulations. The earthing shall include:

a. Provision of earth electrodes for LAs, switchyard equipments bodyearthing, T.G. set Alternator & D.G. set Alternator Neutral and Bodyearthing, Transformer neutral & Body earthing, earthing of Boiler, ESP,

Switchyard , TG Building, Conveyor , Cooling tower and other Buildingstructures etc.

b. Provision of earth mat as per IEEE 80.

c. Provision of lightning conductor over 110 KV switchyard.

d. Provision of earthing grid conductor as per fault level considered.

e. Lightning protection of chimney, cooling tower, TG building, Boiler,Conveyor, Switchyard and other buildings.

1.2 DC System :DC system consists of

a. Valve Regulated Lead-Acid (VRLA) rechargeable battery, Heavy-dutyb. Battery charger system consisting two nos.(2) of float cum boostchargers

DCDB i h I i d O i f d


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1.3 System Fault Level:

40kA for 3Sec. for 110kV system

40 kA for 3 Sec. for 11kV system 50kAfor 1 Sec. for 4l5V System 25 KA for 1 sec for DC system 9 kA for 1 Sec. for Lighting Circuits

1.4 System Supply details:

110 kV 10%, 50Hz 5 %, 3 Phase for Grid Connection

11 kV 10%, 50Hz 5 %, 3 Phase for Generation and Power Supply to11KV Eqpts.

415 V 10% , 50Hz 5 % , TPN for plant load operating at 415V supply Control Voltage 230V AC, 50Hz for MCCs and PCCs derived from control

transformer Power Supply for Space Heaters, Plug Sockets, 230 V,50 Hz, 1Ph. Power Supply for Tripping and Closing Circuits of Circuit breaker - 110

V,D.C.

1.5 Power generation and distribution

Power generation at 11KV, 3Ph, 50Hz. Further thro Power will bestepped up to 110KV by the 34/42.5 MVA, Bi-directional, OLTCevacuation transformer to the GRID. The 110 KV switch yard shall beconnected with KPTCL Line.

11 KV from 11KV switch board will be in TG building. 11 KV Power shallbe distributed to Co-Generation plant Transformers(2 nos), Sugar plantTransformers(4 nos) & to 11KV Fibrizor Panel in sugar plant.

The Cogen power plant LT distribution shall be obtained through the 2N b f 2 5 MVA f


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CHAPTER - 2

APPLICABLE STANDARDS

Vendor shall adhere to the following standards

IEC : 1036 : Static Meters

IEC : 1131-2 : Programmable Controllers

IEC : 1238-1 : Power cables

IEC : 129 : Alternating current disconnections (isolators) and earthingswitches

IEC : 137 : Bushings for Alternating Voltages above 1000 V

IEC : 144 : Degree of protection of enclosure for low voltageswitchgears and control gear

IEC : 146 : Semiconductor Converters

IEC : 146A : First supplement : Chapter VII: Markings on converterequipment and assemblies.

IEC : 157-8 : Low voltage switchgear

IEC : 183 : Guide for Selection of HV Cables

IEC : 185 : Specification for current transformer

IEC 186 P t ti l t f


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IEC : 255 : Electrical Relays

IEC : 269 : Low voltage fuses

IEC : 270 : Partial discharge requirement

IEC : 282 : High voltage fuses

IEC : 296 : Insulating oils

IEC : 298 : AC metal enclosed switchgear and controlgear for ratedvoltages above 1 kV and upto and including 52 kV.

IEC : 34 : Turbine type generator

IEC : 348 : Safety requirements for Electronic Measuring Apparatus

IEC : 354 : Loading guide for oil immersed power transformers

IEC : 376 : Specification and acceptance of new sulphur hexfluoride

IEC : 439 : Specification of Low Voltage Switchgear & ControlgearAssemblies

IEC : 44 : Instrument Transformers

IEC : 470 : Contactors (high voltages)

IEC : 473 : Recording electrical measuring instruments

IEC : 478-1 : Stabilized power supplies, D.C. Output, Part 1:Terms andD fi iti


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IEC : 478-4 : Part 4: Test other than Radio-Frequency Interference.

IEC : 502 : Extruded solid dielectric insulated power cables for ratedvoltages from 1 kV upto 30 kV

IEC : 51 : Analog electrical measuring instruments

IEC : 52.2 : Circuit breakers

IEC : 529 : Classification of Degree of Protection

IEC : 542 : Application guide for on load tap changers

IEC : 55 : Disturbances in supply systems Caused by house holdappliances and similar electrical equipments

IEC : 551 : Dry type transformers (voltage related)

IEC : 56 & 298 : Indoor switchgear

IEC : 56-1 & 4 : Type testing

IEC : 60 : Type testing

IEC : 60034 : Rotating electrical machines.

IEC : 60146 : Semiconductor converters.

IEC : 60273 : Characteristic of indoor and outdoor post insulators forsystems with nominal voltage greater than 1000V


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IEC : 651 : Sound level meters.

IEC : 694 : Degrees of protection provided by enclosure (IP code)

IEC : 71 : Coordination of Insulation

IEC : 726 : Dry type transformers (voltage related)

IEC : 76 : Power Transformers

IEC : 85 : Thermal evaluation & classification of electrical insulations

IEC : 885 : Electric Test methods for Electrical Cables

IEC : 896 : Batteries stationary and general method of testing

IEC : 909 : Short-circuit current calculation in three phase AC systems

IEC : 947 : Specification of Low-Voltage Switchgear & Controlgear

IEC : 99 : Lightning Arrestors

IEEE :421.B(1979)

: Performance of AVRs

IEEE : 958-2003 : Guide for application of AC ASD

IEEE : 32 : Requirements, terminology and testing procedures forNeutral grounding devices.

IS : 10118 : Code of practice for selection, installation andmaintenance of switchgear and control gear not exceeding


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IS : 1161 : Steel Tubes for Structural Purpose

IS : 12021 : Control transformer for switchgear and control gear forvoltages not exceeding 1000V AC

measuring instruments and their accessories

IS : 1271 : Thermal evaluation and classification of electricalinsulation

IS : 13118 : General requirements of circuit breaker for voltagesabove 1000V.

IS : 13314 : Solid state inverters run from storage batteries

IS : 1367 : Technical Supply Conditions for Threaded Steel Fasteners

IS : 13703 : Low voltage fuses for voltage not exceeding 1000V AC or(part 1 to 4) 1500V AC

IS : 13947 : Degrees of protection provided by enclosures for lowvoltage switch gear and control gear

IS : 1470 : Specification for Diesel Engine

IS : 1554 (Part-

: PVC insulated (heavy duty) electric cables for working

voltages up to and including 1100V.

IS : 1753 : Aluminium conductors for insulated cables

IS : 2016 : Plain Washers

IS : 2026 : Power transformers


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IS : 2099 : Bushing for alternating voltages above 1000 V

IS : 2121 Conductors and earth wire accessories for overhead powerlines

IS : 2147 : Degrees of protection provided by enclosures for lowvoltage switch gear and control gear

IS : 2208 : HRC cartridge fuse links for voltage upto 650 V.

IS : 2253 : Designation for type of construction and mountingarrangements of rotating electrical machines.

IS : 2274 : Code of practice for electrical wiring installation

IS : 2309 : Code of practice for protection of building and alliedstructures against lightning

IS : 2544 : Porcelain post-insulators for systems with nominal voltagegreater than 1000 V

IS : 2629 : Recommended practice for hot-dip galvanising on iron andsteel

IS : 2633 : Methods for testing uniformity of coating of zinc coatedarticles

IS : 2705 : Current transformers

IS : 3043 : Code of practice for earthing

IS : 3156 : Voltage transformers


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IS : 335 : New insulating oils

IS : 3427 : Metal enclosed switchgear and control gear (1 kV to52 kV)

IS : 3639 : Fittings and accessories for power transformers

IS : 398 : Aluminium conductors for overhead transmission purposes.

IS : 4411 : Code for designation of semi-conductor devices

IS : 4691 : Degree of protection provided by enclosures of rotatingelectrical machinery.

IS : 4722 : Specification for rotating electrical machines.

IS : 4728 : Terminal marking of rotating electrical machines.

IS : 4729 : Rotating electrical machines, vibration measurement and

evaluation of.

IS : 4826 : Hot-dip galvanised coatings on round steel wires

IS : 4889 : Methods of determination of efficiency of rotatingelectrical machines

IS : 5082 : Wrought aluminium and aluminium alloy bars, rods, tubes

and sections for electrical purposes

IS : 5422 : Specification of turbine type generators

IS : 5469 : Code of practice for the use of semi-conductor junction(part 1 to 3) devices


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IS : 5831 : PVC insulation and sheath of electric cables

IS : 6005 : Phosphate treatment of Iron and Steel

IS : 6051 : Code for designation of aluminium and its alloys

IS : 6362 : Designation of methods of cooling for rotating electricalmachinery.

IS : 6600 : Guide for loading of oil immersed transformers

IS : 6665 : Code of practice for industrial lighting

IS : 6865 : Control switches and push buttons

IS : 694 : PVC insulated cable with copper conductor for voltagesupto 1100 V

IS : 7098 : Cross-linked Polyethylene insulated PVC sheathedcables for Working Voltage upto and including 1100V

IS : 7098 : Cross-linked Polyethylene insulated PVC sheathed cablesfor Working Voltage from 3.3 kV upto and including33 kV

IS : 7132 : Guide for testing synchronous machines.

IS : 7204 : Stabilised power supplies D.C. output (part 1 to 4)

IS : 722 : AC Electricity meters

IS : 731 : Porcelain insulators for overhead power lines with a nominal voltage greater than 1000 V.


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IS : 800 : Code of Practice for General Construction in Steel

IS : 802 : Code of Practice for use of Structural Steel in overheadTransmission Line Towers

IS : 8130 : Conductors for insulated electric cables and flexible cords

IS : 816 : Code of Practice for use of metal arc welding for generalconstruction in mild steel

IS : 8468 : On load tap changers

IS : 8623 : Factory built assemblies of switchgears and control gearsupto 1000 V.

IS : 875 : Code of Practice for Design Loads (other than earthquake)for buildings and structures

IS : 8828 : Electrical accessories - circuit breakers for over currentprotection for house hold and similar installations

IS : 9224 : Low voltage fuses

IS : 9921 : Alternating current disconnectors (isolators) and earthingswitches for voltages above 1000 V.


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CHAPTER -3

SCOPE OF SUPPLY

S. No Descript ion UOM Qty

1 PART -A

Supply, transport, delivery at site, Super vision of erection,testing and commission ing of Switchyard equipments.

a

110KV, 1250A, 40KA for 3sec. Singe bus arrangement Outdoorswitchyard with one no. PT bay which includes

3150A, 11KV, Outdoor VCB Panel -1 No.

1250A, 110KV, Isolator with Earth switch -2 Nos

1250A, 110KV, Isolator with out Earth switch -1 Nos

110KV, 300-600/1+1+1+1+1A CT 3Nos

110KV/ rt/ 110v/rt/110V/rt3 PT 3Nos

145KV, 1250A, SF6 Circuit Breaker -1NOo.

110KV Post Insulator- 6 Nos

96KV, 10KA Lightning Arrester - 6 Nos

Structure for above equipments

3inch IPS tube for complete bay

Lightning mask

Cables

Junction boxs

Earthing, Earth pit & Earth mats, etc

related control, relay panel and all accessories including cabletrays, supports, cabling, lighting, lightning protection andearthing (Ratings as per SLD & Technical Specification)

Lot. 1

2 PART -B


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density, Ynd1 with AVR and RTCC panel and standard accessories

bLT Auxiliary Distribution transformer (All transformer shall be oilcooled wit outdoor mounted type)

- 11KV/0.433KV, 2.5 MVA, ONAN, Dyn11, OCTC 5% in step of2.5% with standard accessories

Nos. 1

- 11KV/0.433KV/0.433KV, 2.5 MVA, ONAN, Dyn11zn0, OCTC 5%in step of 2.5% with standard accessories

Nos. 1

c Lighting Transformer: 415V/415V, AN, dyn11, 200KVA Nos. 1

3 PART -C

aSupply, Transport, delivery at s ite, supervision o f erection ,Testing & commissioning of HV switchgear panel

11KV, 3150A, 3 phase, 3 wi re, 50Hz, 40KA for 3 Sec. VCB / VC HTpanel with copper bus bar (10 Nos, VCB feeders + 1 No. Bus PT)

- TG Incomer: 3150A, VCB 1 no.- Co-gen Distribution transformer feeder: 1250A, VCB 1 Nos.- Co-gen Converter Transformer feeders: 1250A, VCB 1 Nos.

- Grid Import/Export feeder: 3150A, VCB, 1 No.- Sugar auxiliary transformer feeder: 1250A, VCB 2 Nos.- Sugar mill Transformer feeder: 1250A, VCB 2 Nos.- Fibrior panel feeder: 1250 A VCB, 1 No.- Spare for import / export : 3150A, VCB, 1 No.- Bus PT: 1 Nos.

Nos. 11

4 PART -D

a

Supply, Transport, delivery at site, supervision of erection , Testing &commissioning of 110V DC 800AH battery and battery charger withDCDB for 35MW TG's DC pump load , Controls , Switchyard controland plant electrical DC auxiliaries power supply purpose. DC systemshall be of Two float cum boost charger with 2 hour back up time.

Nos. 1


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PCC & MCC panels of 415V, 50KA for 1 Sec. Non draw out type ,floor mounted with aluminium bus bars. 3 Phase, 4 wire, 50HZ. withincoming and out going feeders .

PCC Panels :

a. Incomers (from Transformer & DG) & Bus coupler shall be -

4Pole EDO ACB

b. B. Outgoing 630A FSU with fuses for outing upto 630A, MDOACB to be considered for outgoings for rating 630A & above630A

c. 10% of the spare feeder in each rating or Minimum 1No. Sparefeeder in each rating to be considered.

MCC Panels :

d. Incomer of rating upto 630A shall have FSU with fuses, for

rating above 630A & above shall have Isolators.10% of the spare starter in each rating or Minimum One numberSpare starter in each rating to be considered in each MCC.

LT PCC-1 (VFD Load) Nos. 1

LT PCC-2 (VFD Loads) Nos. 1

LT PCC-3 (Non VFD Loads) Nos. 1

Boiler MCC & Soot Blower MCC Nos. 1Boiler MOV DB Nos. 1

ESP MCC Nos. 1

TG MCC Nos. 1

BHS MCC Nos. 1

CHP MCC Nos. 1

AHS MCC Nos. 1

Auxiliary MCC Nos. 1

ACDB Nos. 1

MLDB Nos. 1


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11KV, 40KA for 3 Sec. 3150A Segregated phase bus duct shallconsists of following:

- Alternator Phase terminal to 11KV HT panel Lot 1

- Alternator neutral terminal to NGR panel Lot 1

- Tap off to LAVT panel Lot 1

c Non segregated Phase bus duct

415V, 50KA for 1 sec. suitable rating Non segregated phase LTaluminium Bus duct between all above transformers secondary sideand DG set incomer- DT out going One number 4000A- CT out going - Two numbers 2000A- DG set panel One number out going 3200 A

Lot 1

d Cabling system

11KV, UE XLPE insu lated FRLS outer sheathed armouredAluminium Pow er cables shal l consists of fol lowing

Co gen 11KV HT panel to 11KV Outdoor VCB panel: 5R x 1C x630Sq.mm/ phase

Lot. 1

11KV Outdoor VCB panel to Power Transformer 11Kv side terminalbox : 5R x 1C x 630Sq.mm/ phase

Lot. 1

11KV HT panel to Distribution transformer and Converter transformer:1R x 3C x 300sq.mm

- DT incoming cables: 1R x 3C x 300Sq.mm- CT incoming cables: 1R x 3C x 300Sq.mm

Lot. 1

e 11KV, HT termination kit and jointing kit (Indoor and outdoorapplication) for all HT cables.

- 1C x 630Sqmm Lot 1

- 3C x 300Sq.mm Lot 1

1 1KV XLPE insulated PVC outer sheathed armoured LT Power and


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R&M panel, synchronizing panel, DC motor starter panel, VFD panels,ESP TRCC control panel and EOT crane electrical panel , Motor etc.The cable voltage drop shall be 3% for running and 12% for starting.Erection hardware including supports, cable trays, Lugs & Doublecompression glands for entire plant cabling work

g

Galvanized iron ladder type cable tray with cover and its support forentire plant HT, LT Power and control cables including HT panels,PCC, MCC, Lighting, DC system, TG equipments viz alternator, LAVTpanel, NGR panel, AVR panel, R&M panel, synchronizing panel, DCmotor starter panel, ESP control panel and EOT crane electricals, etc.

Lot 1

h Illumination , earthing and lightning protection

Complete Earthing & lightining protection (above and below groundlevel earthing) of entire plant. Earthing includes for DG, HT panels,LT PCC, MCC, Transformers, motors, switchyard and TG equipmentsviz alternator, LAVT panel, NGR panel, AVR panel, R&M panel,synchronizing panel, DC motor starter panel, ESP control panel , VFDpanels and EOT crane equipments and all electrical equipments ofpower plant. (All earthing material shall be of GI)

Lot 1

Illumination system with light fitting, distribution boards, lighting tower,cables. lighting pole, Junction boxes, plug and sockets for respective

area and related accessories for entire power plants viz, boiler area,TG building, ESP area, Cooling tower area, FHS area, conveyor, WTP/ RO area, street / road light, and AHS area, switchyard area, FieldMCC rooms, cable routing areas etc.

Lot 1

63A welding switch-socket outlet with accessories including cables onboiler, TG building, ESP, AHS, Cooling tower, Conveyor, WTP areas(minimum one no. in each floor / platform)

Lot 1

Emergency DC lighting and remote emergency lighting for

cogeneration plant areas.

Lot 1

Neutral earthing of TG, DG, and Transformers with Copper flats. Twonumbers earth pit for each equipment neutral to be provided.

Lot 1

i Miscellaneous electrical items

LPBS for all drives Lockable push button for Conveyor motors Lot 1


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KPTCL / CEIG approval formalities for complete power plant includingswitchyard

Lot 1

6 PART -E

aUnloading at site, Testing at site , Erection & Commissioning ofthe following

- BFP VFD panelsDrives Nos. 3

- ID fan VFd panels Nos. 2

- SA fan VFD panels Nos. 2

- FD fan VFD panels Nos. 2

Rotary feeder (5nos) VFD panels Nos. 1

Stroker drive (2 NOs) VFD panels Nos. 1

Drag chain Feeder (6Nos) VFD panels Nos. 1

MCWP Soft starter panels Nos. 4

CT Fan VFD panel Nos. 3

TG Control panels like RMP, CRP, AVR, DC starter panels, LAPT,

NGR, ESP panels, EOT crane electrical panels Lot 1

PART -G

Erection, Storing, Testing at site and commissioning of the itemsmentioned in s l no 1), 2), 3), 4) , 5) 6) , EOT Crane Electrical panelincluding cabling& earthing, VFD & soft starter panels includingcabling & Earthing, ESP CONTROL PANELS including cabling &earthing, All TG Panels including cabling & earthing, Cabling

between switchyard & TG Equipments & 11 KV Panels and DG Set

Lot 1

PART -H

Supply of Spares as mentioned in Chapter -11 of this document Lot 1


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1. Preparation of design calculations, detail drawings for power plant,

switchyard and allied work.

2. Preparation of cable layouts, Earthing Layouts and Lighting Layout

drawings.3. Preparation of Lightning protection Layout drawings.

4. Preparation of cable schedule, interconnection schedule and detail BOQ.

5. Preparation of foundation drawings and structural designs for switchyard

and all electrical equipments.6. Preparation of inspection plan and schedule.

7. Preparation of schedule for site testing and commissioning.

8. Preparation of relay setting schedule for complete power plant and

coordination with generator protection relays.

b. Erection and Commissioning

1. Inspection of civil work in foundations, trenches and allied jobs.

2. Unloading, unpacking, shifting to locations, positioning, aligning and

fixing of equipments.

3. Pre-commissioning checks.

4. Commissioning, testing and trials5. Completion of documentation and records.

c. Statutory approvals:


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2. Liaison with KPTCL authorities for testing, tie up and commissioning of

switchyard equipments.

3. Arranging inspections and approvals for commissioning of total

cogeneration plant electrical from Local and Chief Electrical Inspector,PWD

d. Inspections

1. Making the arrangements for periodical and final inspection of all

major equipments in the system at manufacturers works.

2. Type test report copy of similar rating equipment performed not

less than 5 years shall be submitted.

CHAPTER -4

TERMINAL POINTS

Export Power At the Outgoing Gantry of 110KV plant endswitchyard

Power supply to sugar plant :At 5 Nos. 11KV Feeders (4nos for sugar plantTransformers & 1No. for Fibrizor panel)

identified in11KV in Cogen Plant TG building .

Earthing : Entirely in Tenderers scope


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EXCLUSIONS

1. Supply of DG set along with panels.

2. Supply of TG set along with LAVT, NGR, AVR, RMP, synchronizing panel,DC starter panel and generator control panels.

3. Plant communication system

4. Any modification works / rectification along with material in existingsystem

5. DCS system along with interconnection cables

6. All motors supply and erection

7. All civil works

8. 110KV transmission line to EB, substation for EB end & Tariff Meteringsystem.

9. HT capacitor / HT capacitor panels.

10.Illumination for stores, go down, administration building, security

office

11.Energy management system equipments Fire detection system.

12.Supply of all VFD / Soft Starter panels.


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Item Code ELE-001

Description ELECTRICAL PACKAGE 26.11.2010

CHAPTER-6

TECHNICAL SPECIFICATION

SCOPE OF ELECTRICAL SYSTEM:

The scope of supply and services shall include basic design - and detail-engineering, manufacturing, painting, workshop testing, shipment/transport tosite, unloading, erection, testing and commissioning, training of staff,labelling, field test operation, pre-documentation and documentation "as built"of the electric equipment for the Power Plant and their auxiliary equipment. Itshall be complete in every respect and suitable for safe and proper

operation under all site conditions, even if not mentioned in thisspecification.

6.1 SWITCHYARD:

a) General

The power evacuation arrangements from the cogeneration project is proposed

to be done at 110KV Sub Station which is proposed within sugar mills campus ata distance of 100 meters from TG set building.

The key single line diagram (JS0012-75650000-SLD-005 / Rev. 0) is enclosedwith this document which shall be referred for the Quantity and ratings ofequipments.

b) 110 KV Isolators:

The isolators shall be outdoor, manually operated, horizontal, double break,center rotating type and suitable for mounting on structural members. The isolator operating mechanism shall be twist and turn type. The isolators shall be designed with suitable short circuit current rating of40KA f 3 Th d i h ll i b ki h h i f 110KV


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Item Code ELE-001


The ratings shall be as given in data sheets and key SLD. Creepage distance for insulators in Isolator shall be 31 mm./ KV

Sl.No. Description Type / Ratings.

1. Type: Double break horizontalup-right mounting, center postrotating, outdoor type with arcing

2. Quantity 3 Nos .(2 No. with Earth switch & 1No.without Earth switch)

3. Reference standard: IS:9921 / IEC 129 / IS:18184. Nominal s stem volta e: 110 kv, 3 hase.

5. Highest system voltage: 123 kv, 3 phase.6. System frequency: 50 Hz 5%.7. Rated current 1250 amps.8. Short time ratin : 40 kA for 3 second.9. No. of breaks er ole: Two.10. Type of operating mechanism: Manual operation.

( Gang operated)

11. Interlocking: suitable auxiliary switch shall beprovided for electricalinterlock and with mechanicalinterlock with the circuitbreaker. So that when circuitbreaker is ON, isolator could not beOFF. Castle key interlock shouldbe provided between breaker &

12. Mode of operation: Manual

13. Clearance in air (minimum):i. Between phase (mm):ii. Between phase and earth (mm):

i) minimum 3000mmii) vendor to specifyiii) vendor to specify


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Item Code ELE-001


14. Creepage distance: Shall be 31mm/KV

15. 100% impulse flash overvoltage of completely assembledswitch with arcing horns with 1.2 /50 micro second impulse wave

As per IS:1818 / 1972.

16. Particulars of the main contactsi.e. fixed contacts and movingcontacts:i. Type: (ii)Materials:

iii. Surface treatment and thicknessof surface coating: iv. Contact area& thickness v. Contact pressure:

(i) Pressure relieving rotating bladetype(ii) Hard drawn electrolytic copper(ii ) Silver-plated contacts 15 20microns.(iv) As per the Drgs. Approvedduringtype test(v) As per the Drgs. Approved during

17. Safe duration of over loada. 150% of rated currentb. 120% of rated current

(a) 5 minutes(b) 30 minutes

18. Temp. rise corresponding to:(i) Minimum continuous currentrating at50C amb. Temp:(ii ) Short time current rating:For one second:For three second:

(i) Not exceeding 35C above amb.Temp of 50 deg ca. Do b. Do

19. Suitable for operation at 110% rated normal voltage

20. No. of operation which the switchcan withstand withoutdeterioration of contacts:

More than 1000 operation.

21. No. of the times the switch can 1000 cycles.


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Item Code ELE-001


23. Power required by DC interlock coilat 220 volt and its make:

To be stated

24. Safety arcing contacts provided andif so, type and material used;

Yes. Make before break after typeG.I. Rod.

25. Whether separate operating

mechanism provide for operation of

Yes.

26. Auxiliary Contacts (Isolator & earthswitch

10 NO and 10 NC

c) Lightning Arresters:

Lightning arresters are proposed to be installed in switchyard at the locations

given on Single Line diagram as per the quantity and ratings given. The lightning arresters shall be single phase, station type gapless

construction, outdoor type. Suitable mounting structure shall be provided for lighting arresters. KA rating 10 KA. The LAs shall be designed with suitable short circuit current rating of 40KA

for 3 sec. Creep age distance for insulators in Isolator shall 31 mm KVSl.No. Description Type / Ratings.

1. Type: Outdoor, Station class, longduration discharge class-3 Gapless typesealed unit with pressure relief diaphragm,insulating plate and discharge counter,heav dut t e.

2. Nominal / highest systemvolta e

110kV / 123kV rms

3. Rated arrestor volta e: 96 kV, rms.4. Max. cont. operating voltage at

desi ned amb. Tem 50de C102 kV

5. Minimum dischargeit (kJ/kV) f d t

3.5


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6. Nominal discharge current8/20 micro sec wave

10 kA.

7. Corona extinction volta e 96kV rms8. RIV at 92kV rms Less than 500micro volt9. Partial discharge at 1.05 cont.

over voltage

Not more than 50pc

10. Reference ambient temp. 50 deg. C11. Max. Prospective symmetrical

fault current40 kA, 3 sec

12. System frequency 50 +/- 5%Hz13. S stem neutral earthin Effectivel earth14. Max. duration of earth fault 3 sec.15. Max. switching surge residual

voltage at 1kA for 120kV

272kV peak

16. Current for pressure relief test 40kA rms17. Pressure relief class A18. Min creepage distance 31mm/kv19. Earthing arrangement provided for

earthing side of arrestors:To be supplied

20. Mounting of flangeddimensional details:

To be supplied

21. Reference Standard IS :- 3070 art-3/IEC:- 60099-422. Porcelain housing IS:2099 & IS:562123. Terminal connector Bimetalic & tested as pr

IS:5561 Suitable for ACSR24. Galvanisation All ferrous parts as per IS:2633 & IS:262925. Bou ht out items Test certificates to be submitted26. T e, routine & acce tance test To be carried out as er relevant stds27. Quantity 6 Nos

d) Current Trans formers:

110KV Current Transformers shall be provided as per the ratings and locations


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Item Code ELE-001


The CTs shall be designed with suitable short circuit current rating of 40KAfor 1 sec.

Sl.

No.

Description Type / Ratings.

1. Type: Outdoor, oil filledhermetically sealed, Dead tank,porcelain type suitable for

2. Rated system voltage 110 kV, 3 phase.3. Hi hest s stem volta e: 123 kV, 3 hase.4. Rated Frequency 50 Hz5. Rated primary current: 600-300 amp.

6. Secondary core details:i. No. of secondary core:ii. Rated secondary current (amp):iii. Rated output (VA)iv. Class of accuracy:

i. Five (one metering & Fourforprotection)ii. one amp.iii. 30 VA for metering &protectioniv.0.2 for metering core.5P20 for Back up over current &e/f &Class PS for Differential

7. Knee Point Voltage Shall be >900v8. Sec. Winding resistance at diff. Taps

at 75 Deg. C2 Ohms (Max.)

9. Max. exciting current shall to be less than 30ma @ vk/2

10. Short time current and itsduration in kA/Sec: 40 kA for 1 second.

11. Impulse withstand test voltage(1.2/50micro sec.)

550 kV peak.

12. One min. power frequency withstandtest voltage of primary

275 kV, rms.

f h d


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17. Rated Continuous Thermal current 120 % of Rated Current

18. Partial Discharge level Less than 10 Pico coulombs19. Transformer oil As per IS:33520. Reference Standard IS:- 2705 & IC:185

21. Secondary terminal box Complying to IP:5522. Secondar wirin 4s mm stranded Cu. Cond. Cable23. Porcelain housin IS:2099 & IS:562124. Bought out items Test certificates to be submitted25. Type, routine & acceptance test To be carried out as per relevant

stds26. Fittings & accessories to be supplied 1. Oil level gauge

2. Oil filling hole & cap3. Pressure reliving device4. Lifting lugs.5. Phase terminal connectors6. Tank earthing pads7. HRC fuses

27. Quantity 3 Nos

e) Potential Trans former

The potential transformer shall be of electromagnetic type to suit thefunctional requirement. The ratio and burdens shall be as given in data sheets and SLD. The PT shall be single phase, Dead tank, outdoor type oil immersed design. The PTs shall be designed with suitable short circuit current rating of 40KA

for 3 sec.Sl.No. Description Type / Ratings.

1. Quantity 3 Nos2. Type: Single phase, outdoor, oil filled

hermetically sealed, Dead tank,self coated effectively solid

th d


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Item Code ELE-001


6. No. of secondary winding: Three (one metering, one protection, One - spare).

7. Rated burden:Winding I, II & III 100VA

(each)

8.Total Simultaneous Burden

300 VA

9. Accuracy class: 3P/0.2 for protection /

10. Grade of oil: IS: 335.11. a) Temp. rise at 1.2 times rated primary

voltage,rated frequency & rated burden.

b) Temp. rise at 1.5 times the rated primary

Within the limits specified in IS3156

12. One minute dry & wet power frequencywithstand test voltage of primary:

275 kV, rms.

13. 1.2 / 50 micro second impulse withstandvoltage of primary:

550 kV. Peak

14. One minute power frequency withstandvoltage of secondary:

3kV rms.

15. Radio interference at 1.1 times max.rated voltage at 1.0MHz

500 micro volt

16. Min. cree in distance: Shall be 31mm/KV17. Rated Voltage Factor at rated frequency 1.2 Continuous and 1.5 for 30

Sec18. Partial dischar e level Less than 10 Pico coulombs19. Class of insulation A20. Material of conductor (Primary & Secondary) Copper21. Fault level 40 kA RMS for 3 sec22. Reference Standard IS:- 3156 / IEC-186

23. Secondar terminal box Com l in to IP:5524. Secondary wiring 4 sqmm stranded Cu. cond.25. Porcelain housin IS:2099 & IS:562126. Terminal connector Bimetalic & tested as pr.

IS:5561Suitable for IPS tube


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Item Code ELE-001


29. Type, routine & acceptance test To carried out as perrelevant stds

30. Fittings & accessories to be supplied 1. Oil level gauge2. Oil filling hole & cap3. Pressure reliving device

4. Lifting lugs.5. Phase terminalconnectors

6. Tank earthing pads7. HRC fuses8. Terminal box

f) Bus bar system

The bus bar system comprising of insulator supports and bus bar sections. It isproposed to use 3 inch IPS tube and post insulators for connection betweenequipments. For interfacing all the equipments with strain insulators with IPS tubeconductor shall to be used. Suitable type and number of connectors are to beprovided in both the cases.

The bus bar size shall be suitable to carry the normal and short circuitcurrents as specified. Clamps made from aluminum alloy shall be used for end terminations. Phase to Phase clearance shall be 3000mm.

g) Supporting Structures

The supporting structures shall be provided for insulators, CTs, PTs, Isolators,LAs, Circuit breakers, Post insulators, Lightning masks, and incoming gantryetc. The structures shall be of bolted type construction and fabricated from GImaterial.


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Item Code ELE-001


The structure designs shall be suitable for the wind pressure of 150 Kg / mm2Wind Velocity of 50M/sec. and site temperature of 50C. The design calculations for structures shall be submitted for approval.

h) 145KV Circuit Breaker

The 110KV breaker shall be outdoor type, trip free SF6 Circuit breaker withlocal control panel. Breaker shall be free standing mounting structure with associated accessoriesand tools for maintenance. Rating shall be as given in data sheets and SLD. The CBs shall be designed with suitable short circuit current rating of 40KA

for 3 sec. Two numbers trip coil and one number Closing coil to be considered.

Sl.No

Description Type / Ratings.

1. Installation Outdoor.2. Manufacturers type

i. SF-6ii Operating mechanism.

i. Single pressure puffer type.

ii. Spring - spring (Gang Operated)3. Reference standards IS-13118, IEC-6944. Nominal system voltage 110 kV, 3 phase, +/- 12.5 %5. Highest system voltage 145 kV, 3 phase.6. System frequency 50 HZ 3%7. Details of neutral earthing Solidly earthed.8. Rated current 1250 amp.9. Rated short circuit withstand 40 kA for 3 sec10. Nos. of pole Three11 Insulation level

a. Li htin im ulse withstand 550kV.micro sec wave

a. Power frequency withstand 275kV.b V lt b l hi h


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Item Code ELE-001


d. Min. creepage distance to 31mm/KVe. Min. cree a e distance 27.5mm / kV.

interrupter chamber12 Operating sequence O-0.3s-CO-3min-CO13 Rated short time breakin

a. Rated symmetrical 40 kAcurrent

b. % of DC component 36%c. Breaking under out-of- 40kA

conditiond. Rated low inductive 0 to 10 Amp

currente. Max. over voltage factor on 2.3 p.u.

switching duty

14 Rated short circuit making 100kA15 Transient recover volta e

a. First pole to clear factor 1.5b. Rated T.R.V. for terminal 249kVc. Surge impedance for short line 450 Ohms

d. Min. voltage to earth for 117kV.capacitive current

e. Voltage across C.B. under out 2 p.u.phase switching conditionElectro-mechanical erformance

16 a. Max. total break time (at100%, 50%, 25% & 10% rated

50 ms

current) 5 msb. Max. time interval between

of first & last phase 3.3 ms

c. Max. time interval betweenof first & last phase 100 msd. Closing time

17 Ancilliary equipmenta. No. of tri coil re uired Two Nos.b. No. of closing coil required One No.


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Item Code ELE-001


c. Rate of contact travel at& closing

d. Total len th of arc.e. Max. length of arcf. Overall dimensions

19 g. Wt. Of complete circuitMax. temp. rise above the amb. Within IEC limits20 (50deg. C)

Finish of equipmenta. Procelain Brown lazed IS:2099 IS:5621b. Structure Galvanised as per IS:2629 & IS:2633

21 c. Cubicles & enclosures Painted with approved shadeLow Voltage AC Supply &E ui ment

a. 3- hase s stem volta e 415Vb. 1-phase system voltage 240Vc. Rated frequency 50Hzd. Earthing system Solidly earthede. Variation limits volta e +/- 10%

Frequency +/- 5%22 f. Type of equipment control MCB or motor control

DC Auxiliar su l

a. Nominal s stem volta e 110V23 b. Limits of variations +/- 10%Auxiliary supply voltageSu l for electrical o eration of

a. Closing initiation 110V DCb. Tri in 110V DCc. Spring charging motor 220V AC

24 d. Indication & alarm 110V DCConstructional Detailsa. T e of tri in mechanism Built-in-s rin

b. Method of closing Spring reloaded by motorc. Type of main & arcingd. Material of main & To be SpecifiedcontactThi k f il ti


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Item Code ELE-001


b. Rated pressure in gasc. Quantity of gas required per

sin le ole unit To be S ecifiedd. Quantity of absorbent

pole

e. Recommended interval26 Minimum clearance in air:i. between phase (mm):ii. live parts to earth (mm):iii. live parts to ground level

As per relevant standards & IE rules

Special tools to be supplied 1. Portable hoisting gear crank formanual charging of springs1.2. Gas charging kit includes hose,regulator with pressure gauges

3.Gas leakage sensing device

27

Fittings to be supplied SF6 pressure Indicator, pressureswitch for interlocking, operationcounter, space heater, incoming and

28 Breaker Auxiliary contacts forremote indication & interlock

10 NO & 10 NC

29 Quantity 1 No.

i) 11KV Circuit Breaker

11KV outdoor Vaccum Circuit breaker with local control panel shall be

outdoor type. Breaker shall be free standing mounting structure with associatedaccessories. Rating shall be as given in data sheets and SLD.

Sl D i ti T / R ti



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Item Code ELE-001


5. Highest system voltage 12 kV, 3 phase.6. System frequency 50 HZ 3%7. Rated current 3150 amp.9. Rated short circuit withstand 40 kA for 3 sec10. Nos. of pole Three

11 Trip coils 2 Nos of 110V DC12 Closing coil 1 No. of 110V DC13 Protection class IP 5514 Spring charging Motorised , 220V AC

h) 110KV Switchyard Control and Relay Panel

Thescope of design, manufacture, testing and supply of equipment coveredunder this specification shall include but not necessarily be limited to thefollowing:a. Design, engineering and fabrication of panels / desks as per thespecifications.b. Supply and mounting of all the equipment and auxiliary equipment likeauxiliary relays, test switches, test blocks, plugs, timers, indicatinginstruments, etc., necessary for satisfactory functioning of the control andprotection of the turbine generator systems.c. The protection system shall be provided with additional auxiliary contactsfor the purpose of Data Acquisition system.d. All internal wiring between all equipment up to the terminal blocks and theinter panel wiring.e. Preparation and furnishing of all date /drawings/ documents as per thetender requirement and specifications.

f. Testing at works of the panels and the mounted equipment.

Metering

Following meters shall be provided in metering panel for monitoring,indicating and integrating power export to KPTCL and Aux for Plant



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Item Code ELE-001


- Frequency meter- Power factor meter- 3 Element type Digital KW, KVA, & KVAR meter for 110KV side- 3 Element type Digital KW meter for 11KV side- Micro processor based Digital MFM meter (3 Phase, 4 Wire type) for 110KV

side. Meter shall have facility to read and record Import & Exportparameters.- Semaphore- Indication lamps- Selector Switches- Load Managers with RS485 port and MODBUS protocal to read & storevarious electrical parameters of power export- All meters shall be with Accuracy class of 0.2- 48 window Annunciator- Transducers shall be provided for Current (each phase of 110KV & 11KV),Voltage (all phases of 110KV& 11KV), KW , KVA, KVAR, Frequency & PF.

Cable Gland:

Cable gland shall be nickel plated brass and shall be double compression typeweatherproof.

Structural carbon steel rolled / channel / ISMC100 / ISA 50x50x6 / ISA 40x40x5/ IS 2062 Gr-A/0

Relays

For 110KV sideMicroprocessor based numeric relays are to be used for the followingprotections (make : AREVA / ABB)

- Differential protection for MAIN Trafo.(87)- Restricted Earth Fault protection (64)

O fl i (24)



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Item Code ELE-001


- Under/Over Voltage relay (27/59)- df /dT protection (81 df/dt)-NO Volt protection (27)- Stand by E/F protection (51N)

- LBB protection (50LBB)

-PT Fuse failure detection for protection PT (60P)

Discrete relays to be provided for following protections- Distance protection (21) (Make : AREVA / ABB)- Vector surge protection (78) (Make : SEG)-PT Fuse failure detection for Metering PT (60M)

For 11KV sideMicroprocessor based numeric relays are to be used for the followingprotections.- Under/Over Voltage protection (27/59)- Neutral Displacement relay (59D)- Non Directional Instantaneous & IDMT over current & Earth Faultprotection (50/51/50N/51N)

-Trip Circuit supervision relay (2nos) for 110KV CB-Trip Circuit supervision relay (2nos) for 11KV Outdoor CB-Trip Circuit supervision relay (2nos) for 11KV Indoor CB-Trip Circuit supervision relay for each master trip relay-Master trip relay for 110KV CB & 11KV CB VAJHM-33

Auxiliary relay VAA-33 ( 5 Nos) for

- Buccholz Alarm & trip- Oil temp. Alarm & trip- Winding temp. Alarm & trip ( for LV & HV WTIs)- MOG Alarm for mail & OLTC conservator- PRV TripOSR i


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Item Code ELE-001


switches, push buttons, indicating lamps, relays, etc., shall be neatly arrangedin a matching manner.

The control panels/desks shall be matched with other panels/desks indimension, colour and mimic.

WiringAll wiring shall be done with PVC insulated, 650/1100 V grade, single-coremulti strands (minimum 3 strands) annealed copper conductors suitable fortemperature and humidity specified.

The cross sectional of the wires for voltage, current and control circuits shallbe 2.5 Sq.mm. and that for the alarm circuits shall be 1.5 Sq.mm., the wiresshall be vermin proof and shall be laid in plastic gutters.

Each wire shall be identified at both ends with wire numbers by means of PVCferrules. Colour coding for the wires shall be as per IS:375.The terminal boards shall be set at 45 Deg. to the side panels for easy access.Minimum 20 % spare terminals shall be provided on the panels.The bolted type terminals shall be suitable to receive crimped wires to give

positive connection. All terminals shall be properly shrouded against accidentalcontact.

Sufficient terminals shall be provided so that not more than two wires areconnected to each terminal. The terminal blocks shall be 600 V grads 10 ampsrated, one piece moulded complete with insulated barriers, stud typeterminals, washers, nuts and lock nuts and identification strips. Clip onterminals shall not be used in this panel.

Test Terminal blocks for the CT and PT secondary leads shall be provided withtest links and isolation facilities. Also CT secondary leads shall be provided withshort circuiting and earthing links.

P i i



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C N C S C C ON O C C C G


Item Code ELE-001


The surface shall be prepared by applying a coat of phosphate paint and a coator yellow zinc chromate primer. The under surface shall be made free from allimperfections before undertaking finishing coat.

- After preparation of the under surface, the relay and control panel/desk shallbe spray painted with two coats of final paint. Colour shade of final paint shallbe RAL 7032 and shall be duly approved by the Owner before final painting isdone. The finished panel/desks shall be tried in stove oven in dust freeatmosphere.

Panel finish shall be free from imperfections like holes, orange peels, run offpaint etc. The Tenderer shall furnish painting procedure details along with the

bids.

- All unpainted steel parts shall be cadmium plated or suitable treated toprevent rust corrosion. If these parts are moving element then these shall begreased.

Panel illumination

- Compact Fluorescent Lamps working on 240 V AC, operated by door switchesshall be provided for internal panel illumination.- A 240 V, 1-Phase, 5Amp, 3 Pin Socket shall be provided in the panel corridoror interior of each cubicle with on-off switch for connection of hand lamps.

This socket shall be metal clad type with a spring loaded flap.

Earthing

- A continuous 25mm x 3mm copper (tinned) shall be provided running alongthe full lengths of the panels. Suitable arrangement shall be provided at thetwo ends at rear side for connection to the plant earthing system.

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Item Code ELE-001


Space Heaters

- Panel space heaters shall operate off 240 V AC and shall be supplied completewith on-off switch, fuse and thermostat.- A common thermostat shall be provided for the entire panel. The thermostat

shall maintain the internal temperature above the ambient temperature toprevent moisture condensation.

Mimic

- Mimic diagram shall be provided on panels. Mimic diagram shall be screwedon to the panels / desks and shall be made of anodised aluminium or plastic ofapproved fast colour. The mimic shall be 10 mm wide for horizontal run and 5

mm wide for vertical run.- Semaphore indicators used for isolator positions, they shall be so mounted inthe mimic that isolator (or breaker) closed position shall complete thecontinuity of the mimic. The mimic diagram shall incorporate red and greenlamps for isolator position indication and controlling switches with indicatinglamps for breakers.- The lamps will remain steady where the hand operated semaphore positions

correspond with the breaker position. The lamps shall flicker with a timedelayed alarm if the semaphore position does not correspond with the breakerposition.

i) Equipment Specifications

Instruments

- All instruments shall be switchboard type, back connected, flush mounted,dust tight and tropical zed. They shall be of square pattern and comply with ISand shall be of accuracy class 1.0. They shall have 90 Deg. scale range. Zeroadjustment for pointers shall be accessible from the front of the instruments.All auxiliary equipment such as shunts, transducers, interposing C.T./V.T. etc.h i d h ll b i l d d i h f l All i h ll



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Item Code ELE-001


Frequency Meters

The Frequency Meters shall be long range, calibrated for 45-50-55c/s. Theseshall be digital type and shall operate off 110 V AC.

Indicating Lamps

- These shall be multiple LED type of low power consumption, lamps shall besupplied complete.

Lamps shall be provided with screwed translucent covers to diffuse light. Thelamp covers shall preferably be unbreakable, moulded, heat resistant material

and shall be provided with chromium plated bezels.-

Control Switches

All control switches shall be rotary, back connect type having cam operation

contact mechanism. Phosphor bronze contacts shall be used on switches. The

handle of control switches used for circuit breaker operation shall turn

clockwise for closing and anti-clockwise for tripping and shall be spring return

to natural from close/trip with lost motion device.

Each switch shall be provided with external red and green indicating lamps.Ammeter selector switches shall be with make before break feature and shallhave 3 - position, suitable to read phase voltages.

MCB for Control circuits

All control circuits shall be provided with suitably rated MCBs. These shallgenerally be mounted on the top half of the panels. All MCBs shall be provided

i h i bl id ifi i l b l



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Item Code ELE-001


Facia type static annunciations shall be provided on the control panels/deskswherever called in the equipment list.

There shall be one translucent window for each alarm for point with engravedinscription. Number of windows shall be as 48.

Unless stated otherwise, the annunciations shall be suitable for operation withnormally open fault contact which closes on a fault. One common audiblealarm,

one common acknowledge push button, reset one push button and one alllamp test push button shall be provided common to all annunciations.

On occurrence of a fault(s) one of the following alarm sequences shall befollowed.

D. C. supply failure indication shall be provided separately with DC undervoltage relays. On failure of DC supply to the panel, a lamp and a hornoperated off AC shall operate. There shall be provision for AC horn. The DCbell and AC horn shall have distinctly separate tones.

- Standard Alarm Sequences

1. Flashing Alar m wit h manual r eset

Alarm Indicating Visual Module Audible Condition Contact Lamps Alarm Normal Off Alert Abnormal Flashing On

Accept Abnormal Steady-on Off Return to Normal Steady-on Off Reset Normal Off

2. First out sequence wit h f l ashing alarm & manual r eset



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Item Code ELE-001


First out Abnormal Flashing On Subsequent Abnormal Steady-on Off Accept Abnormal All steady-on On New Alarm Abnormal Flashing On Subsequent Abnormal Steady-on On

Accept Abnormal All Steady-on Off Return to Normal All Steady-on Off Normal Reset Normal Off

Relays

All relays shall be switchboard pattern, back connected draw out type

suitable for flush mounting and fitted with dust tight covers. The relaysconfirm to IS or BS and B5142. The relays shall be of Microprocessor basedand communication type with RS 485 port.

A set of test block and test lead for necessary secondary injection testsshall be included. All relays in draw out cases shall have suitable springloaded contacts for inserting test block.

Relays shall be provided with hand/auto reset type contacts and flagindicators. The flag indication shall be suitable for external hand resettingand mechanically interlocked to prevent falling when relays is subjected tovibration. The rating of the auxiliary contacts shall not be less than 5 ampat 240 V AC and 1.5 amp for 110 V DC.

All the circuit breakers controls shall be supplied with trip circuit

supervision relays.

Name and Identity Plates

- All instruments, relays and other electrical devices mounted on thel l h ll b id d i h l b i h f



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Item Code ELE-001


- Plastic plate at least 10 mm wide bearing suitable identification marksshall be fixed in the interior of the switchboard, at the test blocks, at thefuse blocks and the cable terminals.Similar plates shall be fixed to the exterior of the switchboard inappropriate places to indicate the functions of control switches, push

buttons, lamp and other equipments not incorporated in the mimic diagram.

- Brass or plastic plates bearing respective circuit designation of 50 mmwidth etched in 40 mm high letters shall be mounted on the front side andback side of each panels shall be supplied and fixed in a such way thatthese can be removed and refitted when desired.

- Instrument TaggingEach equipment shall have a rust proof metal tag permanently attached toit with the tag number.

Auxiliary PT & CTs

Necessary auxiliary potential transformers for open delta potentialpolarization and auxiliary current transformers, wherever required, shall be

included in supply.

Auxiliary CTs required for summation of two or more feeders and auxiliaryPTs required for galvanic isolation of different synchronising inputs shall beincluded.

The instrument transformers shall have the following accuracy class

Potential TransformerMeasurement - 0.2Protection - 3PCurrent TransformerMeasurement - 0.2



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Item Code ELE-001


j) Inspection and Tests

Following tests shall be carried out on the control panel desks in thepresence of Owner or his authorised representative:

- Checking of correctness of wiring of circuits and continuity.- Electrical control, interlock and sequential operation test.- High voltage test 2000 volts to earth for one minute.- Insulation resistance of the complete wiring with all equipment mountedon the panels/desks.- Routine tests according to the standards followed by the manufacturer onthe instruments, relays and other devices.

- D.C. tests.

Certified copies of all routine test certificates shall be submitted to thepurchase before despatch for review by the Owner.

APPROX DIMENSION OF SWITCHYARD is 60 X 40

6.2 TRANSFORMERS

6.2.1 Power Transformer:

The power transformer proposed for power export to 110KV grid. However, thetransformer shall necessarily be suitable for bidirectional operation. The OLTC

design in transformer shall be designed for 42.5MVA power flow on bothdirections.

Sl.No Description Type / Ratings.



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Item Code ELE-001


3. Rated voltage: HV: 110 kV. LV : 11 KV

4. No. of phases: Three.

5. Rated current: To be specified

6. Temp. rise at full load (50C amb.)will be limited to:

Winding : 55C. Oil : 50C.

7. No load current at rated voltage andfrequency:

0.75 % of FLC (LV side).

8. Losses (Maximum) Load Loss - 0.5 % of rated MVA

No Load Loss - 0.06 % of rated

MVA

Aux Loss- 12% of No Load Loss

9. Tap range + 10% and -15% in steps of 1.25

10. Size of tap changer: Adequate. Suitable for Bi-directional flow of 42.5MVA

11. Type of tap changer: High speed transition resistortype.

12. Operating voltage of On Load TapChanger:

66 kV

13. Type of coolant: Transformer oil.

14. Efficiency at normal ratio with unity

and 0.8 lagging P.F with followingload:(a) 100% load:(b) 75% load:(c) 60% load:(d) 50% load:

Vendor to specify



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Item Code ELE-001


16. Impedance at rated voltage,fre uenc and current at 75C:

14 % (Min.) without negativetolerance.

17. Impulse strength of LV winding: Impulse test: 75 kV. Powerfrequency test : 28 kV.

18. Impulse strength of HV winding: Impulse test : 550 kV peak. Power

frequency test : 275 kV at HV lineend.19. Over load capacity of transformer

both under hot & cold conditionwith following loads: 10% , 20%,30%, 50%, 75%, 100% :

As per IS:6600 72.

20. Terminal arrangement:HV side:LV side:

OIP condensor bushing.Cable box.

21. Insulation Class-A

22. Neutral Bushing One number on HV side

23. Reference standard: IS:2026 - 77.

24. Flux Density Better than 1.65 texla

25. Current Density 3.0A max. per mm2

26. Neutral CT : HV Side LV Side 600-300/1A+1A ,15VA, Class 5P20 for Standby Earh fault & PSfor REF protection

27. OLTC make Easun MR

28 Power flow Bi directional



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Item Code ELE-001


- Earthing terminals- Lifting lugs for complete transformer- Air release plug on tank cover- Dehydrating breather silica gel type with oil seal and connecting pipe fortransformer Conservator & OLTC conservator.

- 150 mm dial Magnetic type oil level indicator with one set of contacts, for lowoil level alarm - 1 No for the transformer conservator & OLTC conservator- 150 mm dial oil temperature indicator with maximum reading pointer andelectrically separate contacts for trip and alarm.- 150 mm dial winding temperature indicator with maximum reading point andelectrically separate contacts for trip and alarm. WTI to be provided for eachpahse.- Oil filling hope with cap, on conservator

- Oil conservator with drain valve and plug- Drain valve with plug- Filter valve with plug- Sampling valves- Explosion vent with double diaphragm and pressure equalizer pipe connection- Thermometer pocket- PRV with Alarm & Trip contacts-OSR for Tap changer protection- Double float type Buccholz Relay with two sets of contacts and one shutoffvalve on either side of the Buccholz Relay- Jacking lugs and hauling holes- Marshalling box with wiring according to our standard practice- Disconnection Chamber for L.V. Cable- Ladder

a) Construction

Transformer tank shall be of welded sheet steel construction and providedwith gaskets steel cover plates. Base shall be suitably reinforced to prevent anydistortion during lifting. Base channels shall be provided with skids and pulling

f ili h dli



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Item Code ELE-001


removal of any radiator unit without emptying the tank. Radiators shall besecurely braced to prevent undue vibration. All fasteners and bolts etc. shall be galvanized or zinc passivated. All surfacesto be painted shall be thoroughly cleaned, descaled, made free from rust andgiven a priming coat of rust resisting paint followed by two finishing coats of

approved shade. Paint shall be suitable to withstand specified atmosphericconditions.

b) Terminals and marshalling box

Windings shall be brought out and terminated on terminal bushings and cablebox.

Cable end box shall be supplied with cable lugs & glands. The lugs shall be non-soldering, long barrel, crimping type

Terminal chamber for cable box shall have gasketed cover plate bolted to it.

Marshaling box shall be weatherproof, waterproof with IP 55 enclosure. Allprotective devices and neutral CTS shall be wired by means of PVC insulated

armored cables up to the marshaling box. Terminals shall be bolted type only.Removable gland plate with compression type glands of non-magnetic materialshall be provided.

c) Cooling

The cooling of the transformer shall be ONAN / ONAF. The operation of forcedair circulation fans shall be controlled automatically by temperature in oil

tank.

d) Oil

The Transformer shall be supplied with first filling of oil. Additional 10%



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e) Accessories

Following minimum accessories shall be necessarily included in the scope ofsupply in addition to the accessories required as per CBIP guidelines.

Oil conservator complete with oil filling plug & cap. Oil drain valve &magnetic oil level gauge. Silica Gel Breather It shall be mounted such that the silica gel shall bevisible from the ground level and the breather is removable from the ground. Shut off valve between conservator & main tank. Explosion relief vent mounted on the tank with double diaphragm & equalizerpipe. The explosion vent shall be rotatable in all directions.

Air release plugs. 150 mm dia. magnetic oil gauge with low level alarm and trip contact. 150 mm dia. oil temperature indicator with maximum reading pointer and aset of contacts for alarm and trip.- 150 mm dia. winding temperature indicator with maximum reading pointerand set of contacts for alarm & trip. WTI to be provided for each pahse.- Thermometer pocket with mercury in glass thermometer (0-120 C)- Bottom drain valve- with pipe nipple. It shall be possible to drain off 90% ofthe oil within 10 minutes. Sampling valves with plug. Filter valves with threaded adapter top & bottom. Inspection cover on top plate. Two grounding (Earthing) Pads placed on opposite sides with tapped holes, M-12 Bolts and spring washers. Jacking pads, hauling lifting lugs.

Bidirectional Flanged Wheels. Rating plate. terminal marking plates & name plates. Double Float type Buccholz Relay with Alarm and Trip contacts. Cable disconnection chamber for LV side. Shall be suitable to connect 5R x 1Cx 630 sq.mm XLPE, UE, Armoured cable / Phase

N l CT HV id f R i d E h F l d S d b E h F l



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f) Core and winding

- Transformer shall be double wound, core type with cold rolled grain orientedlamination perfectly insulated and clamped to minimize vibrations and noise.

Care shall be taken to insulate core fastening bolts to reduce losses and avoidhot spot. All parts of the magnetic circuit shall be bonded to earth.- Windings shall be of copper and shall be designed to withstand the specifiedthermal and dynamic short circuit stresses.

g) Tapping

- On Load Tap Changing arrangement shall be provided on High Voltage side of

the transformer. On load Tap changer shall be Bi-directional suitable for42.5MVA capacity- Following protections shall be provided for Tap Changer systemOil surge relay, over load relay for Drive motor, Reverse phase sequenceprotection relay.- Tap changer system shall be provided with Annunciator in RTCC panel for thefollowing

a)Tap changer out of step alarmb) Tap changer delayc)Tap changer driver motor tripd) AVR fail alarme)Tap changer struck upf) OLTC control supply failg) Standby fan group failh) Running fan group fail

- Tap changer system shall be provided with Auto Tap changer in RTCC panel.- Under conditions of external short circuit, the tap changing equipment mustbe capable of carrying the same current as the winding.

h) Inspection and testing



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- Tests shall be carried out at works at his expenses in presence of the Onwersrepresentative. All routine tests as specified in IS 2026 shall be conducted.- Heat run test and type tests as per IS 2026 shall be conducted on thetransformer at manufacturers works.- Type test certificates for Identical rating not exceeding five years to be

furnished.

h) Packing and transport

- The main tank shall be oil filled during transportation. All accessories shall bepacked separately during transportation. Care shall be taken to pack theradiators such that radiator fins are not damaged during transportation.Packing dimension shall be furnished much in advance of transportation.

- All accessories shall be wrapped with polythene sheets before packing.- All valve flanges including those for the radiators shall be closed by blankflanges.

6.2 .2 Distribution & Converter Transformer:

The Distribution & converter transformer proposed for power supply feeding to415V LTPCC. The OCTC design in transformer shall be modified to thisrequirement. Transformers shall be of Bi-directional type.

The transformer shall have following specifications,

6.2.2.1 Distribution Transformer

a. Rating (KVA) : 2500 KVA

b. Duty : Outdoorc Voltage ratio : 11 KV / 433 Vd. Vector Group : Dyn11e. Quantity : 1Nos.f. Type of cooling : ONAN

T Ch d il OCTC



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j. Temp. rise limited to 50 deg C for Oil and 55 deg c for winding over anambient of 50 C

k. Transformer losses (max. value withoutpositive tolerance)

No load at Rated Voltage and Frequency : 0.1% @ ONAN rating base Load Losses at 75C and Rated Current at 0.8 p.f. : 1.0% @ ONAN

rating base

l. Impedance : >8.25 %m. Terminal box arrangement : HV Cable Box

: LV - Bus ductn. Flux density : 1.7 Tesla

o. Over flux with standing requirement : 110% continuous and 125%for 10 sec.

p. Ref. Standard : IS 2026 part I to IV

6.2.2.2 Converter Transformer

a. Rating (KVA) : 2500 KVAb. Duty : Outdoorc Voltage ratio : 11 KV / 433 V / 433Vd. Vector Group : Dyn11znoe. Quantity : 1Nos.f. Type of cooling : ONANg. Tap Changer detail : OCTC

h. Tap range : 5 % in steps of 2.5%

i) Current density : 3.0 A / sq.mm

j. Temp. rise limited to 45 deg C for Oil and 50 deg c for winding over anbi f 50 C


D ID JS0012 75650100 SPC 001 R i i 00


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No load at Rated Voltage and Frequency : 0.1% @ ONANrating base

Load Losses at 75C and Rated Current at 0.8 p.f. : 1.0% @ ONANrating base

l. Impedance : >6.25 %m. Terminal box arrangement : HV Cable Box

: LV1 & 2 - Bus ductn. Flux density : 1.7 Teslao. Over flux with standing requirement : 110% continuous and 125%

for 10 sec.p. Ref. Standard : IS 2026 part I to IV

The various fittings for the transformers will be as below:- Rating and diagram plate along with labels wherever necessary- Earthing terminals- Lifting lugs for complete transformer- Air release plug on tank cover- Dehydrating breather 0 1 No silica gel type with oil seal and connecting

pipe.- 150 mm dial Magnetic type oil level indicator with one set of contacts,for low oil level alarm - 1 No for the transformer conservator- 150 mm dial oil temperature indicator with maximum reading pointerand electrically separate contacts for trip and alarm.- 150 mm dial winding temperature indicator with maximum readingpoint and electrically separate contacts for trip and alarm

- Oil filling hope with cap, on conservator- Oil conservator with drain valve and plug- Drain valve with plug- Filter valve with plug- Sampling valves

E l i i h d bl di h d li i


D t ID JS0012 75650100 SPC 001 R i i 00


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- Thermometer pocket- Double float type Buccholz Relay with two sets of contacts and oneshutoff valve on either side of the Buccholz Relay- Jacking lugs and hauling holes- Marshalling box with wiring according to our standard practice

- Disconnection Chamber for H.V. Cable- Neutral CTs with Class PS for REF protection & Class 5P20 for StandbyE/F protection.

-

6.3 11 KV SWITCH BOARD TECHNICAL SPECIFICATIONS

6.3.1 Introduction

This specification covers the design, manufacture and supply of 11 KVswitchboard incorporating draw-out vacuum circuit breakers. The 11 kV switchboard shall be capable of continuous and reliableoperation at the full load rating specified where continuity of operationis of prime importance. Workmanship shall be the highest grade and theentire construction in accordance with the best modern practice.

The HT switchboard shall be capable of withstanding the severeststresses likely to occur in actual service and of resisting rough handlingduring transport. Circuit breaker shall be suitable to withstand inrush magnetisingcurrents of transformers and capacitor bank ON and OFF.

6.3.2 System

The HT system shall be suitable for the following system:- Rated voltage : 11 kV, 3 phase- Rated frequency : 50 Hz-Rated Current : 3150A- Fault level : 40 kA for 3 sec


Document ID JS0012 75650100 SPC 001 Revision: 00


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withstand voltage 75 kV, short time rating 40 Ka rms, dynamic rating 100kA. Forced cooling not acceptable for HT panel.

Conductor - Electrolytic grade aluminium alloyEnclosure - IP 42 / Nema 4x

The insulation level of the synchronization breakers shall be asrecommended by IEC: 61936-1:2002 and IEC: 60694:2001 (or) the powerfrequency voltage shall not be less than 35kV rms.

Maximum busbar temp. - 85 Deg.CCircuit breaker type - VacuumOperating duty - O-0.3s-CO-3 min-CO

Control Voltage - 110 V DCEarthing System - Resistance Earthed

6.3.3 Standards

The design, manufacture and testing of the various equipment coveredby this specification shall comply with the latest issue of the followingstandards:

IS: 375 - Marking and arrangement of switchgear busbarsIS: 694 - PVC insulated cable with copper conductor for voltages upto1100 VIS: 722 - Integrating metersIS: 1248 - Electrical indicating instrumentsIS: 13118 - General requirements of circuit breaker for voltages above1000V.

IS: 2705 - Specifications for current transformersIS: 3156 - Specifications for voltage transformersIS: 3231 - Electrical relays for power system protectionIS: 3427 - Metal enclosed switchgear and control gear (1 kV to 52 kV)IS: 6865 - Control switches and push buttonsIEC 44 I T f




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IEC 298 - AC metal enclosed switchgear and control gear for ratedvoltages above 1 kV and upto and including 52 kV.IEC 1036 - Static Meters

6.3.4 Specific Requirements

Construction

The switchgear shall be metal clad, free floor standing, totallyenclosed, dust and vermin proof with draw-out type circuit breakers.Vertical units shall be assembled to form a continuous line up of uniformheight and depth.

The panel structure shall house the components contributing to themajor weight of the equipment such as circuit breaker, main horizontalbus bars and other of the components is adequately supported withoutdeformation or loss of alignment during transit or during operation.

Each unit of the switchgear shall have necessary internal sheet metalbarrier to form separate compartments for buses, instruments, relays,cable connections etc.

Adequate barriers shall permit personnel work safely within an emptycompartment with the busbars energised. Checking and removal ofcomponents shall be possible without disturbing the feeder. All auxiliaryequipment shall be easily accessible to facilitate their operation andmaintenance. It shall be possible to set all relays and measuringinstruments without de-energising the switchgear.

All doors and openings shall be fitted with dust excluding neoprenegaskets with fasteners designed to ensure proper compression of thegaskets. When covers are provided in place of doors, generous overlapshall be assured between sheet steel surfaces with closely spacedf l d h f d




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Document ID JS0012 75650100 SPC 001 Revision: 00

Item Code ELE-001

Description ELECTRICAL PACKAGE26.11.2010

working in one section without coming into accidental contact with livepart in an adjacent section.

The HT switchboard shall be constructed only of materials capable ofwithstanding the mechanical, electrical and thermal stresses, as well as

the effects of humidity, which are likely to be encountered in normalservice. All insulating materials used in construction of the equipmentshall be non-hydroscopic material, duly treated to withstand the effectsof hig

NSL_Technical Specification for Electrical Package

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