KHU-10-YE_-EFE-EA_-000

KHU-10-YE_-EFE-EA_-000

Page: 1

Of: 51

CLIENT: NWPGCL NORTH-WEST POWER GENERATION COMPANY LTD

PROJECT: KHULNA 150MW PEAKING POWER PLANT PROJECT (Package 1A)

CALCULATION REPORT

RELAY ADJUSTMENT AND COORDINATION REPORT

2 2012-08-03 Design AOX DBC MIR 1 2012-07-11 Information and comments AOX DBC MIR

REV DATE DESCRIPTION EDITED CHECKED APPROVED

KHU-10-YE_-EFE-EA_-000 - RELAY ADJUSTMENT AND COORDINATION REPORT

EMPRESARIOS AGRUPADOS INTERNACIONAL, S.A.Magallanes, 3 28015 Madrid - Espaa

This document contains proprietary information of Empresarios Agrupados Internacional, S.A. and is to be used solely for the Project and the purpose for which it is furnished.It may not be disclosed to others for a different use without the written permission of Empresarios Agrupados Internacional,S.A.

Project:

KHULNA 150MW PEAKING POWER PLANT PROJECT (Package 1A)

Title:

Relay Adjustment And Coordination Report

EAI Document No: 448-10-F-E-01000 Issue: 2 KKS Document No: KHU-10-YE_-EFE-EA_-000

Purpose of issue: Design Date: 2012-08-03

Prepared: AOX

Reviewed: DBC

Approved: MIR

KKS No.: KHU-10-YE_-EFE-EA_-000 Issue 2

EA No.: 448-10-F-E-01000 Page I

This document contains proprietary information of Empresarios Agrupados Internacional, S.A. and is subject to the restrictions set forth on the title page

CLASSIFICATION

Contains information for the design of structures, systems or components: Yes No

Design verification : Not applicable Head of OU/Supervisor Verifier Level 1 Level 2

CONTROL OF MODIFICATIONS

Issue Modifications

1 2

First Issue As indicated by vertical line in the margin

PRELIMINARY OR PENDING INFORMATION

Issue Paragraphs Subject Status

DISTRIBUTION

External Internal No. copies/Format

MIR, DBC, AOX, AGD 1 pdf


EA No.: 448-10-F-E-01000 Page i

CONTENTS

Page No.

00139289


1. PURPOSE ............................................................................................................... 1-1

2. LIST OF DATA ......................................................................................................... 2-12.1 DATA ........................................................................................................... 2-1

3. HYPOTHESIS .......................................................................................................... 3-1

4. RESULTS ................................................................................................................ 4-14.1 MEDIUM VOLTAGE BOARDS (10BBA11/12) ............................................ 4-14.2 415 V STATION BOARDS (10BFA11/12) AND ESSENTIAL

DISTRIBUTION BOARDS (10BMA11/12) ................................................. 4-10

5. REFERENCE DOCUMENTS ................................................................................... 5-1

APPENDIX A COORDINATION CURVES ...................................................................... 5-2


EA No.: 448-10-F-E-01000 Page 1-1


1. PURPOSE

The purpose of this study is the coordination and setting of the protection relays for the transformers, cables, busbars, motors and other loads in the 6.6 kV and 415 V systems.

This study affects all phase and ground overcurrent protection, motor protection and minimum voltage detection relays.


EA No.: 448-10-F-E-01000 Page 2-1


2. LIST OF DATA

2.1 DATA

2.1.1 Maximum symmetrical short-circuit currents

6.6 kV System:

- Contribution of Unit Auxiliary transformer: Is =19.5kA

- Minimum phase to ground short-circuit current: 600A

415 V System:

- Contribution of transformers:

Contribution through the power centre transformer 10BFT11 and 10BFT12: 42.5 kA

- Short-circuit on Power Centres (most unfavourable):

10BFA11/ 10BFA12 (coupled busbars,most unfavorable case): 58.5 kA

10BMA11/12 (coupled busbars,most unfavorable case): 56 kA

2.1.2 MV (6.6 kV) System Motor Data

2.1.2.1 Gas compressor (10EKH10/20AP001)

Manufacturer: SIEMENS AG

Rated power 3400 kW

Rated current 340 A

Locked rotor current 5.4 x 340 = 1836A

Acceleration time:

Rated voltage: 7 seconds

80% Rated voltage: 14 seconds


EA No.: 448-10-F-E-01000 Page 2-2


Maximum permissible time with locked rotor:

Rated voltage: 18/16seconds

80% Rated voltage: 26/29 seconds

Maximum of successive complete starts:

Hot: 3

Cold: 2

2.1.2.2 Electric fire pump (10XGA10AP002)

Rated power 315 kW

2.1.3 Transformers Data

2.1.3.1 Unit Auxiliary Transformer (10BBT10)

Power: 15 MVA ONAN

Rated voltage: 15 kV 5% 2.5% / 6.9 kV

Ground through ground resistor (600 A)

Connection type: Dyn11

2.1.3.2 Start up Transformer (SFC) (10MBJ10)

Rated power: 6.6 MVA (primary) /

5 MVA (secondary) 1.6 MVA (tertiary)

Rated voltage: 6.6 kV / 1.8 kV (secondary) 433V (tertiary)

Maximum start-up power: 4938kVA (4MW) (secondary)


EA No.: 448-10-F-E-01000 Page 2-3


2.1.3.3 Station Transformers (10BFT11/12)

Rated power: 2500 kVA

Rated voltage: 6.6 kV 5% 2.5% / 0.433 kV

Ground: Rigid to ground

Zcc: 7.5% (2500 kVA base)

2.1.3.4 Lighting transformers (10BNT10 and 10BLT10)

Rated power: 200 kVA

Rated voltage: 415 / 415 240 V

Connection type: Dyn1

Ground: Rigid to ground

2.1.4 Other Data

2.1.4.1 Current Transformers

In MV, all current transformers shall be 5P10 (at In the error is 1% and at 10 In it is 5%), except the following, which is 5P20 (at In the error is 1% and at 20 In it is 5%): for incoming busbar from auxiliary transformers and coupling between MV busbars.

In LV, all current transformers shall be 5P10 (at In the error is 1% and at 10 In it is 5%).

2.1.4.2 Feeders consumption

Electrical heater 200 kW

Turbine crane for GT area 45 kW


EA No.: 448-10-F-E-01000 Page 2-4


2.1.4.3 Diesel Generator

Alternator rated power: 1250 kVA

Rated voltage: 415 V

Power factor: 0.8

In emergency operation, the diesel generator shall be earthed directly.

2.1.5 Protection Relays Data

2.1.5.1 Phase and ground Protection relay type SEPAM series 20 from Schneider Electric.

It is used to protect the following elements:

Outgoings from Medium voltage busbars to start up transformer (S20), 10BFT11/12 station transformers (S20), electric fire pump (S20), outgoings to gas booster compressor (M20) and in medium voltage busbars (minimum voltage, B21).

The characteristics of the relay are listed below:

Rated phase current (IN): 1 to 6250 A

Base current (Ib): (0.4 1.3) x IN

Rated residual current (INO): 1 to 6250 A

Phase sensor: 1 or 5 A

Rated primary phase-to-neutral voltage (Vnp): 220 V to 250 kV

Thermal overload unit:

- Initial heat rise (Es0): 0 to 100%

- Tripping set point (Es2): 50 to 300%

- Heat rise constant (T1): 1 to 120 min


EA No.: 448-10-F-E-01000 Page 2-5


- Cooling constant (T2): 5 to 600 min

- Accounting for negative sequence component (K): 0 2.25 4.5 9

Excessive starting time and locked rotor unit:

- Set point (IS): 50% Ib Is 500% Ib

- Excessive starting time delay (ST): 0.5 300 sec

- Locked rotor time delay (LT): 0.05 300 sec

Phase overcurrent unit:

- Tripping curve: Definite time (DT). Time dependent: Standard inv. (SIT), Very inv. (VIT or LTI), Extremely inv. (EIT) and ultra inv. (UIT), IEC curves, IEEE curves and IAC curves

- Set point (IS): Definite time: 0.1 IN Is 24 IN (A)

Time dependent: 0.1 IN Is 2.4 IN (A)

- Time delay (T): Definite time: 0.05 300 sec

Time dependent: 0.1 12.5 sec or TMS

Negative sequence/unbalance unit:

- Curve: Definite, IDMT

- Set point (IS): Definite time: 10% Ib Is 500% Ib

IDMT: 10% Ib Is 50% Ib


IDMT: 0.1 1 sec

Earth fault unit:

- Tripping curve: Definite time (DT). Time dependent: Standard inv. (SIT), Very inv. (VIT or LTI), Extremely Inv. (EIT) and ultra inv. (UIT)

- Set point (ISO): Sum of CTs: Definite time: 0.1 INO ISO 15 INO (A)


EA No.: 448-10-F-E-01000 Page 2-6


Sum of CTs: Time dependent: 0.1 INO ISO INO (A)

With CSH sensor: Definite time: 2A rating 0.2A to 30A 20A rating 2A to 300A

With CSH sensor: IDMT: 2A rating: 0.2A to 2A 20A rating: 2A to 20A

- Time delay setting: Definite time: inst., 0.05 300 sec

Time dependent: 0.1 12.5 sec or TMS

* For Iso< 0.4Ino, the minimum time delaty is 300ms. If a shorter time delay is needed, use the CT+ CSH30.

Starts per hour unit:

- Period of time (P): 1 6 hours

- Total number of starts (Nt): 1 60

- Number of consecutive starts (Nh, Nc): 1 Nt

- Time delay between starts (T): 0 90 mn

Phase-to-neutral undervoltage unit B21 (27S):

- Set point: 5% Vnp Vs 100% Vnp

- Time delay: 50 ms to 300 sec

Note: Functions that are not specified are not used in this project.

2.1.5.2 Phase and ground protection relay type SEPAM series 60 from Schneider Electric


Medium voltage busbars supply lines and Medium Voltage couplings (S60), MV switchgear 10BBA11/10BBA12 Synchronization (MCS025).


EA No.: 448-10-F-E-01000 Page 2-7



Rated phase current (IN): 1 to 6250 A

Base current (Ib): (0.2 1.3) x IN

Rated residual current (INO): 1 to 6250 A

Phase sensor: 1 or 5 A

Rated primary phase-to-neutral voltage (Vnp): 220 V to 250 kV

Phase overcurrent unit:

- Tripping curve: Definite time (DT). Time dependent: Standard inv. (SIT), Very inv. (VIT or LTI), Extremely inv. (EIT) and ultra inv. (UIT).

- Set point (Is): Definite time: 0.05 IN Is 24 IN (A)

Time dependent: 0.05 IN Is 2.4 IN (A)


Time dependent: 0.1 12.5 sec at 10Is

Earth fault unit:

- Tripping curve: Definite time (DT). Time dependent: Standard inv. (SIT), Very inv. (VIT or LTI) Extremely Inv. (EIT) and ultra inv. (UIT)

- Set point (ISO): Definite time: 0.1 INO ISO 15 INO (A)

Time dependent: 0.1 INO ISO INO (A)

- Time delay (TO): Definite time: inst., 0.05 300 sec

Time dependent: 0.1 12.5 sec at 10Is

Undervoltage unit (L-L) or (L-N):

- Set point: 5% Vnp Vs 100% Vnp

- Time delay: 50 ms to 300 sec


EA No.: 448-10-F-E-01000 Page 2-8


MCS025 synchro-check module:

- Measured voltages: Phase to phase / phase-to-neutral

- Rated primary phase-to-phase voltage:

- Unp sync1 (Vnp sync1 = Unp sync1/3): 220 V to 250 kV

- Unp sync2 (Vnp sync2 = Unp sync2/3): 220 V to 250 kV

- Rated secondary phase-to-phase voltage:

Uns sync1: 90 V to 120 V (Phase to phase) 90 V to 230 V (Phase-to-neutral)

Uns sync2 : 90 V to 120 V (Phase to phase) 90 V to 230 V (Phase-to-neutral)

- Synchro-check setpoints

dUs set point: 3% to 30% of Vnp sync1 dfs set point: 0,05 a 0,5 Hz dPhi set point: Del 5 al 80 Us high set point: 70% to 110% Vnp sync1 Us low set point: 10% to 70% Vnp sync1

- Others settings:

Lead time: 0 a 0,5 s

- Operating modes: no-voltage conditions for which coupling is allowed

Dead1 AND Live2

Live1 AND Dead2

Dead1 XOR Dead2

Dead1 OR Dead2

Dead1 AND Dead2

Note: Functions that are not specified are not used in this project.


EA No.: 448-10-F-E-01000 Page 2-9


2.1.5.3 Overcurrent protection relay RV-IMA from Arteche


Neutral of the station transformers and of the start-up transformer (51G)


Functions:

- Earth fault protection relay with harmonic filter (50/51N)

Measurement rated current:

RATED CURRENT

SETTING RANGE STEPS CURRENT

Instant Unit Time Unit

5 A 0.5 60 A 0.5 12 A 0.1 A Phase and earth


0.25 A 0.05 3 A 0.05 1 A 0.01 A Phase and earth

0.1 A 0.02 1.5 A 0.02 0.3 A 0.01 A Phase and earth

0.01 A 0.004 0.035 A 0.004 0.02 A 0.001 A Earth

0.01 A 0.005 0.1 A 0.005 0.03 A 0.001 A Earth

Precision:

- Measurement: 5%

- Defined times: 5% or 0.03 seconds

2.1.5.4 Overcurrent protection relay RV-ITN from Arteche


Differential from gas booster compressor (87)


EA No.: 448-10-F-E-01000 Page 2-10



Functions:

- (51N)

Measurement rated current:

RATED CURRENT

SETTING RANGE STEPS CURRENT

Instant Unit Time Unit



0.25 A 0.05 3 A 0.05 1 A 0.01 A Phase and earth

0.1 A 0.02 1.5 A 0.02 0.3 A 0.01 A Phase and earth

Precision:

- Measurement: 5%

- Defined times: 5% or 0.03 seconds

2.1.5.5 F-650 Relay from GE


Low voltage: 415 V Station boards (10BFA11/12) incomings and coupling and essential distribution board (10BMA11/12) coupling.


Curves: Inverse, very inverse and extremely inverse, etc., as per IEEE

Phase range (In): 1 or 5A

Earth range (In): 1 or 5A


EA No.: 448-10-F-E-01000 Page 2-11


The characteristics are as follows:

Function 51PH, 51PL, 51N and 51G phase and earth time overcurrent:

- Start level: 0.05 to 160 A, in steps of 0.01 A

- Precision: + 0.5% or + 10 mA from 0.05 to 10 A; + 1.5% for higher values

- Curve dial: 0.00 to 900.00 in steps of 0.01 s

- Precision of timing devices: + 3.5% of operating time or + 30 ms (whichever is longer) for I > 1.03 times the start-up level.

Function 50PH, 50PL, 50N and 50G instantaneous phase and earth over-current.

- Start level: 0.05 to 160 A, in 0.01 A steps

- Precision: + 0.5% or + 10 A from 0.05 to 10 A; + 1.5% for higher values

- Timing device: 0.00 to 900 s in 0.01 s steps

- Operating time: 20 ms at 3 x pickup

- Precision of timing devices: + 3% of operating time or + 30 ms (whichever is longer).

Function 50SG, sensitive earth instantaneous overcurrent:

- Pickup level: 0.005 to 16.00 a in steps of 0.001 A

- Level accuracy: 1.5% of the reading 1 mA from 0.005 to 16 A

- Trip delay: 0.00 to 90.00 s in steps of 0.01 s

Function 27, minimum voltage.

- Start level: 3 to 300 V, in 1 V steps

- Ressetting value: 97% of start level

- Ressetting time: Instantaneous


EA No.: 448-10-F-E-01000 Page 2-12


Function 25, synchrocheck:

- Dead/live levels for line and bus: 0.00 to 300.00 in steps of 0.01 V

Maximum voltage difference: 2.00 to 300.00 V in steps of 0.01 V

Maximum angle difference: 2.0 to 80.0 in steps of 0.1

Maximum frequency slip: 10 to 5000 mHz in steps of 10 mHz

Synchronism time: 0.01 to 600.00 s in steps of 0.015

Angle accuracy: 2

- Dead source function:

None

(DL-DB) Dead line - Dead Bus

(LL-DB) Live line - Dead Bus

(DL-LB) Dead line - Live Bus

2.1.5.6 Protection relay Entelliguard GTE from GE


Low voltage: overcurrent protection for feeders and mccs.

The characteristics of the relay are as listed below:

Four poles

Rated current (In): 400-630-800-2000 A

Long time protection LT-LTD:

- Pick-up setting (Ir): (0.2-1) In being In the rated current of the circuit breaker:

Primary setting (Ie): 1-0.975-0.9625-0.95-0.45-0.4 x In

Secondary setting (Ir): 1-0.95-0.9-0.85-0.8-0.75-0.7-0.65-0.6-0.55-0.5 x Ie


EA No.: 448-10-F-E-01000 Page 2-13


- Accuracy (current): 10%

- Time setting: 22 bands

- Short time protection ST-STD:

- Pick-up setting (Im): (1.5 - 12) Ir in steps of 0.5


- Time setting: 17 bands (from 30 to 940miliseconds60 to 1000 miliseconds),

Earth protection GF(residual connection):

- Pick-up setting (If): (0.2 - 1) In in steps of 0.01


- Time setting: 14 bands (from 50 to 840miliseconds110 to 900 miliseconds),

Neutral setting (for relays with 4 poles):

- 0%, 50% or 100% x phase settings (LT, ST and I)

2.1.5.7 Synchronism Check Relay MLJ from GE (25)


Essential distribution boards (10BMA11/12) incomings and couplings


Voltage difference (difference vector module, V, volts)

- Range from 2 to 90 in 0.5 steps

Angle difference (, degrees)

- Range from 2 to 60 in steps of 1


EA No.: 448-10-F-E-01000 Page 2-14


Frequency difference of (slipping), F, mHz)


Continuous mode timing (t cont, seconds)

- Range from 0.1 to 99 in steps of 0.1

Manual mode timing (t man, seconds)

- Range from 0.1 to 99 in steps of 0.1

Enable sub-voltage monitoring (sup 27 ON-OFF)

- Range: enabled or disabled

Threshold voltage for sub-voltage monitoring (27V, volts)


Enable synchronism unit (25 ON-OFF)


Line voltage presence level (live line: LL, volts)

- Range: from 40 to 245 in steps of 1

Line voltage absence level (dead line: DL, volts)


Busbar voltage presence level (live bus: LB, volts)


Busbar voltage absence level (dead bus: DB, volts)


Enable condition: dead line and dead bus (DLDB ON-OFF)


Enable condition: dead line with live bus (DLLB ON-OFF)



EA No.: 448-10-F-E-01000 Page 2-15


Enable condition: live line with dead bus (LLDB ON-OFF)


Unit number:

- Range: from 1 to 255

Serial port speed (kilobauds)

- Range: from 0.3 to 38.4

2.1.5.8 Feeders outgoings from 10BMA11/12: GE type Relay

2.1.5.8.1 FE 250 SMR1 used in the incoming to 110VDC BATTERY CHARGER 1/2 and HVAC ELECTRICAL PANELBOARD ELECTRICAL ROOM

Rated current (In): 80-125-100-160-250 A

Long time protection (LT):

- Pick-up setting (Ir): (0.625-1) In in 16 steps

- Pick-up band: 1.05-1.2x Ir

Short time protection (ST):

- Pick-up setting (Im): (2-13) Ir in 10 steps

- Pick-up band: Im 20%Im

2.1.5.8.2 FE LTMD 160 GE used in the incoming to By-pass transformer and Switching station 132kV bldg emergency feeder

Rated current (In): 100 125 - 160 A

Thermal protection:

- Pick-up setting (Ir): (0.8-1) In

- Pick-up band: 1.05-1.3 x Ir


EA No.: 448-10-F-E-01000 Page 2-16


Magnetic protection:

- Pick-up setting (Im): (5-10) In

- Pick-up band: Im 20%Im

2.1.5.9 Relay MIFII N of GE used in normal and emergency lighting transformers (10BLT10/10BNT10) neutral protection

The characteristics of the relay are listed below

Function 50G1/50G2: Instantaneous ground overcurrent protection

- Startup level: 0.1 to 30.00 x In in steps of 0.1In of the current transformer primary

- Time delay: 0-600.00 seconds in steps of 0.01s

2.1.5.10 Undervoltage relay (27) MIV II from GE


415V station boards (10BFA11/12) and Essential distribution boards (10BMA11/12)


Start voltage:

- Range 0: 10 to 250 V in steps of 0.1 V

- Range 1: 2 to 60 V in steps of 0.1 V

- Timing: 0-600 s in steps of 0.01 seconds


EA No.: 448-10-F-E-01000 Page 3-1


3. HYPOTHESIS

3.1 The minimum inverse time margin for the maximum fault current between electronic relays in the MV system shall be greater than or equal to 250 ms.

Time corresponding to breaker ........................................... 65 ms

Timing errors ...................................................................... 85 ms

Relay reset ......................................................................... 50 ms

Safety interval .................................................................... 50 ms

Total ................................................. 250 ms

3.2 In order to ensure an adequate level of selectiveness, the precision of the various relays and of the current transformers is taken into account.

3.3 The symmetrical current supplied to the Gas booster compressor short-circuit taken into consideration for protection purposes is 20% higher than the locked rotor current of the Gas booster compressor.


EA No.: 448-10-F-E-01000 Page 4-1


4. RESULTS

4.1 MEDIUM VOLTAGE BOARDS (10BBA11/12)

4.1.1 Relay type SEPAM series 20 (M20)

KKS Service Transform. ratio

T.I. Rated phase current

IN

Basecurrent

Ib

Sensor rating

INO

Termal overload Unit (***)

Excessive starting time and locked rotor unit

F (50/51)-1 Negative

sequence/unbalanceUnit

Earth fault unit Starts per hour unit Phase overcurrent

Unit (setting A)

Phase overcurrentUnit

(setting B)

Phase Ground Es2 Es0 T1 T2 K Is ST LT Curve ISF1A TF1A Curve ISF1B TF1B Curve ISi TF1 Curve ISO TO P Nt Nh Nc Ta

10EKH10/20AP001 Gas booster compressor 630/1 5P10

CSH200 630 391 2 100 0 21 126 2.25 200 20 5 DT 3635 Inst SIT 391 11.5 DT 40 0.5 DT 15 0.1 1 4 2 3 1

LEGEND:

The phase sensors will be set at 1 A K Accounting for negative sequence component constant ISF1A Phase current set point (A), F (50/51)-1, group of setting A IN Rated phase current (A) Is Set point (% Ib) ISF1B Phase current set point (A), F (50/51)-1, group of setting B Ib Base current (A) ST Excessive starting time delay (sec) TF1A Phase current time delay (sec), F (50/51)-1, group of setting A INO Sensor rating (A) LT Locked rotor time delay (sec) TF1B Phase current time delay (sec), F (50/51)-1, group of setting B Es0 Initial heat rise (%) Curve Tripping curve: definite time (DT), Standard inv. (SIT), very

inv. (VIT), extremely inv. (EIT) and ultra inv. (UIT). The curves are IEC curves

ISI Negative sequence set point (% Ib) Es2 Tripping set point (%) TFI Negative sequence time delay (sec) T1 Heat rise constant (min) Iso Earth fault set point (A) T2 Cooling constant (min) To Earth fault time delay (sec) (***) The alarm set point, ES1, must be disabled or inhibitted (setting: 300%) Nt Total number of starts NC Number of consecutive cold starts Nh Number of consecutive hot starts Ta Time delay between starts (min) P Period of time (hr)


EA No.: 448-10-F-E-01000 Page 4-2


Note 1 The protections units that are not indicated must be disabled

Note 2 Latching option(86) must be enabled

Note 3 Timer hold curve and Timer hold delay settings must remain in definite time and 0 miliseconds respectively, in phase overcurrent and earth fault units

Note 4 Harmonic 2 restraint setting must be disabled in earth fault unit

Note 5 Delay for locked rotor on start (LTS) setting must be disabled or inhibitted (setting: 300 sec), in excessive starting time and locked rotor unit

Note 6 As an explanation: Groups of settings A and B must be always active when using SEPAM M20


EA No.: 448-10-F-E-01000 Page 4-3


4.1.2 Relay type RV-ITN 51N (87) de arteche

Service

Toroidal Transformer

ratio (In/1)

Rated current

Setting range (51N) Instant unit (A)

Differential Gas booster compressor from motor 40/1 1A

0.25 (Inst)

LEGEND

In: Toroidal transformer rated current (A)

Rated current (A)

Setting range: Instantaneous unit setting in A


EA No.: 448-10-F-E-01000 Page 4-4


4.1.3 Relay type SEPAM series 20 (S20)

KKS Service

Transform. Ratio T.I.

Ratedphasecurrent

IN

Sensor rating

INO

F(50/51)-1 F(50/51)-2 Earth fault

Unit Phase overcurrent

Unit (setting A)

Phase overcurrent Unit

(setting B)

Phase overcurrent Unit

(setting A) Phase Ground Curve ISF1A TF1A Curve ISF1B TF1B Curve ISF2A TF2A Curve ISO TO

10MBJ10 Start up transformers 750/1 CSH200 750 2 SIT 722 1 DT 4619 0.1 DT 5280 inst DT 10 Inst 10BFT11/12 MV/LV station transformers 300/1 CSH200 300 2 EIT 302 4 DT 1312 1.35 DT 4667 inst DT 10 inst

10XGA20AP001 Electric fire pump 60/1 CSH200 60 2 EIT 44 3.5 DT 455 inst -- -- -- DT 10 inst

LEGEND:

The phase sensors will be set at 1 A IN Rated phase current (A) ISF1A Phase current set point (A), F (50/51)-1, group of setting A ISF1B Phase current set point (A), F (50/51)-1, group of setting B INO Sensor rating (A) ISF2A Phase current set point (A), F (50/51)-2, group of setting A TF1A Phase current time delay (sec), F (50/51)-1, group of setting A Curve Tripping curve: Definite time (DT), Standard inv. (SIT),

very inv. (VIT), extremely inv. (EIT) and ultra inv. (UIT) The curves are IEC curves

TF1B Phase current time delay (sec), F (50/51)-1, group of setting B TF2A Phase current time delay (sec), F (50/51)-2, group of setting A Iso Earth fault set point (A) TO Earth fault time delay (sec) Note 1 The protection units that are not indicated must be disabled Note 2 Latching option (86) must be enabled Note 3 Timer hold curve and Timer hold delay settings must remain in definite time and 0 miliseconds respectively, in phase overcurrent and earth fault units Note 4 Harmonic 2 restraint setting must be disabled in earth fault unit Note 5 As an explanation: Groups of settings A and B must be always active when using SEPAM S20.


EA No.: 448-10-F-E-01000 Page 4-5


4.1.4 Relay type RV- IMA (51G) Arteche

Service Toroidal Transformer

ratio (In/1)

Single-phase overcurrent (50N) Medium sensitivity current set

Delay type Ie >> tIe >> MV/LV station

transformers Neutral 1000/1 DT 3 A 1.3 sec

LEGEND

In: Toroidal transformer primary rated current (A)

Delay type: Type of curve (defined time in this case)

Ie>>: Instantaneous second earth threshold in times In (A)

tIe>>: Time delayed second earth threshold (sec)


EA No.: 448-10-F-E-01000 Page 4-6


4.1.5 Relay type SEPAM series 60 (S60)

4.1.5.1 Phase protection

Service

Transform. Ratio T.I.

Ratedphasecurrent

IN

Rated residual current

INO

Phase overcurrent Unit Earth Fault Unit

F(50/51)-1 F(50N/51N)-1*

Phase Ground Curve ISF1 TF1 Curve ISF2 TF2 Curve ISF3 TF3 Curve IS01 T01 Incoming to busbars 10BBA11 from Unit Auxilary Transformer 1600/1 3CT+CSH30 1600 1600 SIT 1569 10 DT 6930 0.6 DT 7341 0.5 DT 215 0.6 Incoming to busbars 10BBA12 from Auxilary Transformer 1600/1 3CT+CSH30 1600 1600 SIT 1569 10 DT 6930 0.6 DT 7341 0.5 DT 215 0.6 Coupling 10BBA11/12 Busbars 1600/1 3CT+CSH30 1600 1600 SIT 1255 8.5 DT 5777 0.35 DT 6123 0.25 DT 185 0.35

LEGEND:

The phase sensors will be set at 1 A ISF1 Phase current set point 1 (A), F (50/51)-1 TF1 Phase current time delay 1 (sec), F (50/51)-1 IN Rated phase current (A) ISF2 Phase current set point 2 (A), F (50/51)-2 TF2 Phase current time delay 2 (sec), F (50/51)-2 INO Rated residual current (A) ISF3 Phase current set point 3 (A), F (50/51)-3 TF3 Phase current time delay 3 (sec), F (50/51)-3 Curve Tripping curve: Definite time (DT), Standard inv.

(SIT), ISO1 Earth fault set point 1 , F (50N/51N)-1 TO1 Earth fault time delay 1 (sec), F (50N/51N)-1

very inv. (VIT), extremely inv. (EIT) and ulta inv. (UIT)

The curves are IEC curves Note 1 The protection units that are not indicated must be disabled Note 2 Latching option (86) must be enabled Note 3 Timer hold curve and Timer hold delay settings must remain in definite time and 0 miliseconds respectively, in

phase overcurrent unit.and in earth fault unit

Note 4* Harmonic 2 restraint setting must be enabled in earth fault unit for coupling 10BBA11/12 Busbars, Incoming to busbars 10BBA12 from Auxilary Transformers and Incoming to busbars 10BBA11 from Unit Auxilary Transformers


EA No.: 448-10-F-E-01000 Page 4-7


4.1.6 Synchronism protection (25) for MV buses (10BBA11/12). Relay MCS025 Synchro-check module of SEPAM S60

4.1.6.1 Incoming to MV Busbars 10BBA11/12 from Unit Auxiliary transformer and from Auxiliary transformer (It corresponds to relay section 4.1.5.1)

MCS025 Synchro-check module (Sepam S60)

FUNCTION RANGE SETTING

Unsync1 110V (phase-phase conection) 110V

Unsync2 110V (phase-phase conection) 110V

dUs 3% Unsync1 to 30%Unsync1 5%

dfs 0.05 - 0.5 Hz 0.1 Hz

dPhis 5 to 50 15

Us high set point 70% Unsync1 to 110%Unsync1 90%

Us low set point 10% Unsync1 to 70%Unsync1 20%

Voltage checking On /off On

Operationg mode with no voltage

Dead1 and Live2 Live 1 and Dead 2 Dead1 XOR Dead2 Dead1 OR Dead2 Dead1 and Dead2

Live 1 and Dead 2

4.1.6.2 Coupling MV Busbars 10BBA11/12

MCS025 Synchro-check module (Sepam S60)


Unsync1 110V (phase-phase conection)

110V

Unsync2 110V (phase-phase conection)

110V


EA No.: 448-10-F-E-01000 Page 4-8



dUs 3% Unsync1 to 30%Unsync1

5%

dfs 0.05 - 0.5 Hz 0.1 Hz

dPhis 5 to 50 15

Us high set point 70% Unsync1 to 110%Unsync1

90%

Us low set point 10% Unsync1 to 70%Unsync1

20%

Voltage checking On /off On

Operationg mode with no voltage

Dead1 and Live2 Live 1 and Dead 2 Dead1 XOR Dead2 Dead1 OR Dead2 Dead1 and Dead2

Dead1 OR Dead2

4.1.7 Minimum voltage protections for MV buses

4.1.7.1 Relay type SEPAM series 20 (B21 for measurement)

VOLTAGE TRANSFORMATION

(Vnp // Uns/3)

PHASE-TO-NEUTRAL UNDERVOLTAGE UNIT (27)

SET POINTVs (V)

Tripping curve

TIME DELAY (ms)

6600/3 // 110/3 (connection phase-to-

neutral) 70% Vnp Definite 50

Vnp: Rated primary phase-to-neutral voltage

Uns: Rated secondary phase-to-phase voltage


EA No.: 448-10-F-E-01000 Page 4-9


4.1.7.2 Relay type SEPAM series 60 (S60 for incoming from Unit Auxiliary transformer 10BBT10 and Auxiliary transformer)

(These settings complete the relay settings indicated in paragraph 4.1.5.1).


(Vnp // Uns/3)

PHASE-TO-NEUTRAL UNDERVOLTAGE UNIT (27)

SET POINTVs (V) Tripping curve

TIME DELAY (ms)

6600/3 // 110/3 (connection phase-to-

neutral) 90% Vnp Definite 50

Vnp: Rated primary phase-to-neutral voltage

Uns: Rated secondary phase-to-phase voltage

4.1.7.3 Timer auxiliary relay TDF-4 of Arteche

FUNCTION IDENTIFICATION DELAY

Trip of all MV motors 27T2 2 seconds

Transfer initiation 27T1 2.1 seconds


EA No.: 448-10-F-E-01000 Page 4-10


4.2 415 V STATION BOARDS (10BFA11/12) AND ESSENTIAL DISTRIBUTION BOARDS (10BMA11/12)

4.2.1 F650-type relay for busbars protection

For all F650 protections, the input type shall be RMS.

SERVICE

PHASE PROTECTION Earth Protection

Transf. Ratio CT (A)

Time Overcurrent (51PH) Instantaneous Overcurrnet

(50PH) Transf. Ratio CT (A)

Time Overcurrent (51N)

Is Ts (s) Curve Ii Ti (s) Ist Tst (s) Curve

Incoming to 415V station boards 10BFA11/12 4000/1 1 2.8 IEC C 3.5 1.1 4000/1 0.66 1.1 Definite time

415V station boards 10BFA11/12 coupling 4000/1 0.7 3.1 IEC C 2.8 0.95 4000/1 0.62 0.95

Definite time

Essential switchgear 10BMA11/12 coupling 2000/1 0.72 1.85 IEC B 2.25 0.49 2000/1 1 0.49 Definite time

Incoming from essential distribution board 10BMA11 to emergency diesel generator 2000/1 0.98 2 IEC B 2.9 0.64 2000/1 1.25 0.64

Definite time


EA No.: 448-10-F-E-01000 Page 4-11


LEGEND

Is: Pickup level in Amps.

Ts: Multiplying factor of the phase overcurrent protection curve in seconds.

Curve: Type of curve of the phase overcurrent.

Ii: Pickup level in Amps.

Ti: Trip delay of the phase protection instantaneous overcurrent, in seconds.

Ist: Pickup level in Amps.

Tst: Trip delay of the earth protection overcurrent, in seconds

Curve: Type of curve of the earth overcurrent

Note: The protection units that are not indicated must be disabled.


EA No.: 448-10-F-E-01000 Page 4-12


4.2.2 CCMS: GE Relay Entelliguard GTE

KKS Service In (A)

Settings LT ST GF

Ie Ir LTD Band Im STDB Band* If GFDB Band** 10BFA11GS210 Gas compressors 10BJA30 MCC 400 1 xIn (400A) 1x Ie (400A) C-5 4xIr 8 1 xIn 7 10BFA11GS220 10BJA11 MCC++ 800 1 xIn (800A) 0.75x Ie (600A) C-10 4xIr+ 9 1 xIn+ 8 10BFA11GS310 10BJA13 MCC++ 800 1 xIn (800A) 0.65x Ie (520A) C-15 4xIr 9 1 xIn 8 10BFA12GS210 10BJA12 MCC++ 800 1 xIn (800A) 0.75x Ie (600A) C-10 4xIr+ 9 1 xIn+ 8 10BFA12GS220 10BJA14 MCC++ 800 1 xIn (800A) 0.75x Ie (600A) C-10 4xIr+ 9 1 xIn+ 8 10BFA12GS410 10BJA15 MCC+++ 800 1 xIn (800A) 0.5x Ie (400A) C-15 4xIr 9 1 xIn 8 10BFA12GS420 10BJA16 MCC+++ 800 1 xIn (800A) 0.65x Ie (520A) C-10 4xIr 9 1 xIn 8

LEGEND Ie LT main unit current set point (in times In) Ir LT secondary unit current set point (in times Ie) Im If

ST unit current set point (in times Ir) GF unit current set point (in times In)

* STDB bands: I2t disable ** GFDB bands: I2t disable

Note 1: ++: The neutral protection shall be adjusted to 50% x phase settings +++: The neutral protection shall be adjusted to 100% x phase settings

Note 2: +: The magnetic setting of feeders fed from mccs shall be 800A approximately as maximum


EA No.: 448-10-F-E-01000 Page 4-13


4.2.3 Feeders and BMAs: GE Relay Entelliguard GTE

KKS Service In(A)

Settings LT ST GF

Ie Ir LTD Band Im STDB Band* If GFDB Band** 10BFA11GS320 10BMA11++ 2000 1xIn (2000A) 0.9x Ie (1800A) C-7 3.5xIr 15 1 xIn 13 10BFA12GS310 10BMA12++ 2000 1xIn (2000A) 0.9x Ie (1800A) C-7 3.5xIr 15 1 xIn 13 10BFA11GS410 Electrical heater+++ 400 1xIn (400A) 0.8x Ie (320A) C-3 2.5xIr 1 0.2 xIn 2 10BFA11GS420 Turbine crane+++ 400 0.45 xIn (180A) 0.55x Ie (99A) C-22 11xIr 7 0.2 xIn 6

11BTL10 Alstom emergency system (to transfer switch)++ 800 1 xIn (800A) 0.5x Ie (400A) C-15 5.5xIr 8 1 xIn 8 10BFA12GS320 10BLT10 Normal Lighting transformer+++ 400 0.95xIn(380) 0.75x Ie (285A) C-15 9.5xIr 10 0.2 xIn 6

10BNT10 Emergency Lighting transformer +++ 400 0.95xIn(380) 0.75x Ie (285A) C-15 9.5xIr 10 0.2 xIn 6

LEGEND Ie Ir

LT unit current set point (in times In) LT unit current set point (in times Ie)

Im ST unit current set point (in times Ir) If GF unit current set point (in times In) * STDB bands: I2t disable

** GFDB bands: I2t disable

Note: ++: The neutral protection shall be adjusted to 50% x phase settings

+++: The neutral protection shall be adjusted to 100% x phase settings


EA No.: 448-10-F-E-01000 Page 4-14


4.2.4 Normal and emergency lighting transformer 10BNT10 and 10BLT10 neutral protection 50G1: GE relay MIF II N

Current transformer Settings

Pickup value Type of curve DELAY (s)

600/1 3.8 Definite time 0.35

Startup level: in In times of the current transformer primary

DELAY: Definite time delay in seconds


EA No.: 448-10-F-E-01000 Page 4-15


4.2.5 Feeders outgoings from 10BMA11/12:

Note: for setting of thermal and magnetic relay of the motors fed from 10BMA11/12, see section 4.2.8.

4.2.5.1 FE 250 SMR1 GE type Relay

Circuit Breaker/ Relay type Service

In (A)

Settings LT ST Ir Im

FE 250A SMR1 110VDC BATTERY CHARGER 1/2 250 0.85xIn=212.5 9xIr

FE 250A SMR1 HVAC ELECTRICAL PANELBOARD ELECTRICAL ROOM 160 0.75xIn=120 6xIr

LEGEND

Ir LT unit current set point (in times In)

Im ST unit current set point (in times Ir)


EA No.: 448-10-F-E-01000 Page 4-16


4.2.5.2 FE LTMD 160 GE type Relay

Circuit Breaker/ Relay type Service

In (A)

Settings Thermal Ir Magnetic Im

Ir Im FE 160A LTMD By-pass tranformer 125 0.9xIn=112.5 10 xIn=1250 FE 160A LTMD Switching station 132kV bldg emergency feeder 160 0.9xIn=144 5 xIn=800

LEGEND

Ir Thermal unit current set point (in times In)

Im Magnetic unit current set point (in times In)


EA No.: 448-10-F-E-01000 Page 4-17


4.2.6 Minimum voltage protections (27) for LV buses

4.2.6.1 GE relay F-650: 415V station boards incomings (10BFA11/12 incomings)

(These settings complete the relay settings indicated in paragraph 4.2.1).

Minimum voltage protection (27)

Transf. Ratio VT(V)

Input mode U T

415/3/ 110/3 (connection phase-neutral)

Phase-to-ground 57 0

U: Minimum voltage, in volts.

T: Trip delay of the minimum voltage protection

4.2.6.2 415V station boards (10BFA11/12)

MIV II from GE relay


TIMED UNIT

START VOLTAGE (V)

DELAY (S)

415/3 // 110/3* 44.5 0

* Relay connection: phase-neutral

Relay type (27T1, 27T2)


Low voltage transfer initiation 27T1 3 seconds

Motor trip 27T2 2 seconds


EA No.: 448-10-F-E-01000 Page 4-18


4.2.6.3 Essential distribution boards (10BMA11/12)

MIV II from GE relay


TIMED UNIT

START VOLTAGE (V)

DELAY (S)

415/3 // 110/3* 44.5 0

* Relay connection: phase-neutral

Relay type (27T1)


TRANSFER INITIATION 27T1 4 seconds

4.2.7 Synchronism protection (25) for LV buses

4.2.7.1 F650 type relay: 415V station boards (10BFA11/12) incomings

Voltage transformer: 415/3 110/3

Relay connection: phase-to-neutral (Un=110 /3)

SETTING NAME RANGE STEP SETTING

DEAD/LIVE LEVELS FOR LINE AND BUS 0 300 V 0.01 V 50 V

MAXIMUM VOLTAGE DIFFERENCE 2 300 V 0.01 V 6.4 V

MAXIMUM ANGLE DIFFERENCE 2 80 0.1 15

SYNCHRONISM TIME 0.01 600 s 0.01 s 2 s

MAXIMUM FREQUENCY SLIP 10 - 5000 MHZ 10 MHZ 100 MHZ

DEAD SOURCE FUNCTION NONE, DL-DB LL-DB, DL-LB

-- LL DB


EA No.: 448-10-F-E-01000 Page 4-19


4.2.7.2 F650 type relay: 415V station boards (10BFA11/12) couplings

Voltage transformer: 415/3 110/3

Relay connection: phase- phase (Un=110 V)


DEAD/LIVE LEVELS FOR LINE AND BUS 0 300 V 0.01 V 88 V

MAXIMUM VOLTAGE DIFFERENCE 2 300 V 0.01 V 11 V

MAXIMUM ANGLE DIFFERENCE 2 80 0.1 15

SYNCHRONISM TIME 0.01 600 s 0.01 s 2 s

MAXIMUM FREQUENCY SLIP 10 - 5000 MHZ 10 MHZ 100 MHZ

DEAD SOURCE FUNCTION NONE, DL-DB LL-DB, DL-LB -- LL DB DL LB

4.2.7.3 Synchronism protection (25) of synchronism check relay MLJ from GE

4.2.7.3.1 Essential distribution boards (10BMA11/12) incomings and couplings

Voltage transformer: 415 / 3 - 110 / 3 V

Relay connection: phase- neutral (Un=110 / 3 V)


0-1 FREQUENCY 50/60 HZ N.A. 50

1-1 DIFFERENCE BETWEEN VOLTAGES 2-90 V 0.5 V 6.5

1-2 DIFFERENCE BETWEEN ANGLES 2-60 1 15

1-3 DIFFERENCE BETWEEN FREQUENCIES 10-500 MHZ 10 MHZ 100

1-4 CONTINUOUS MODE TIMING 0.1-99.0 s 0.1 s 2

1-5 MANUAL MODE TIMING 0.1-99.0 s 0.1 s 10

2-1 VOLTAGE SUPERVISION ENABLING OFF-ON N.A. ON

2-2 VOLTAGE SUPERVISION THRESHOLD VOLTAGE 10-180 V 1 V 57

3-1 LINE VOLTAGE PRESENCE LEVEL (LIVE LINE: LL, VOLTS) 40-245 V 1 V 50 *

3-2 LINE VOLTAGE ABSENCE LEVEL (DEAD LINE: DL VOLTS) 10-180 V 1 V 30 *


EA No.: 448-10-F-E-01000 Page 4-20



3-3 BUSBAR VOLTAGE PRESENCE LEVEL (LIVE BUS: LB, VOLTS) 40-245 V 1 V 50 *

3-4 BUSBAR VOLTAGE ABSENCE LEVEL (DEAD BUS: DB, VOLTS) 10-180 V 1 V 30 *

4-1 SYNCHRONISM UNIT ENABLING OFF-ON N.A. ON

4-2 CONDITION ENABLING: (DLDB) DEAD LINE WITH DEAD BUS OFF-ON N.A. OFF

4-3 CONDITION ENABLING: (DLLB) DEAD LINE WITH LIVE BUS OFF-ON N.A. ON

4-4 CONDITION ENABLING: (LLDB) LIVE LINE WITH DEAD BUS OFF-ON N.A. ON

5-1 CONFIGURATION OF 1ST AUXILIARY

OUTPUT SEE TABLE 2 N.A. -

5-2 CONFIGURATION OF 2ND AUXILIARY

OUTPUT SEE TABLE 2 N.A. -

* Default values

4.2.8 Setting of thermal and magnetic relays for the phase protection of the motors supplied from the motor control centres and essential service switchgears 10BMA11/12

Protection against overloads

The thermal tap at 1.15 times the motor rated current is selected.

Protection against short-circuits

The magnetic element is set to 6.5 x 1.5 x 1.1 = 11 times the motor rated current.

where:

6.5: The ratio between the motor start current and the rated current 1.5: Asymmetrical component 1.1: Relay tolerance


EA No.: 448-10-F-E-01000 Page 5-1


5. REFERENCE DOCUMENTS

5.1 Industrial Power System Data Book G.E.

5.2 National Electric Code (NEC)

5.3 IEC 60076-5 and ANSI C57.12.00

5.4 IEC 60185. Current Transformers

5.5 G.E. Power Systems, Steam Turbine: Recommended Practices for Protective Relaying, Electric Motors and Electric Control Circuits. GEI 90368F. September 1990.

5.6 IEC 947-2. Low-Voltage Switchgear and Control Gear. Part 2: Circuit Breakers.

5.7 ANSI/IEEE C37.96 Guide for AC Motor Protection.


EA No.: 448-10-F-E-01000


APPENDIX A

COORDINATION CURVES


EA No.: 448-10-F-E-01000 Page A-i


CONTENTS

Pag.

1. MEDIUM VOLTAGE COORDINATION 1.1 PHASE PROTECTION COORDINATION .......................................... A-1 1.2 GROUND PROTECTION COORDINATION ...................................... A-2 2. LOW VOLTAGE COORDINATION 2.1 PHASE PROTECTION COORDINATION .......................................... A-3 2.2 GROUND PROTECTION COORDINATION ...................................... A-5


EA No.: 448-10-F-E-01000 Page A-1



EA No.: 448-10-F-E-01000 Page A-2


0,01

0,1

1

10

100

1000

1 10 100 1000

Tim

e (s

)

Current (A)

KHULNA 150MW PEAKING POWER PLANTMEDIUM VOLTAGE GROUND PROTECTION COORDINATION

R4

R3

R5

R2

R6

Icc phase to ground in MV system (600A)

R1

R5 R7R4

Start up transformer

Station transformer

Gas Booster Compressor

Highest motor

R2

10BBA12

R5R7

IsolationTransf.

Unit Auxiliary

Transf.

R6

IsolationTransf.

Electric Fire pump

10BBA11

R7

Aux transformers (by others)

R3

R1

Station transformer

Gas Booster Compressor


EA No.: 448-10-F-E-01000 Page A-3



EA No.: 448-10-F-E-01000 Page A-4



EA No.: 448-10-F-E-01000 Page A-5



EA No.: 448-10-F-E-01000 Page A-6


2012-08-03T13:37:25+0200Alicia Rosa Lucena

2012-08-03T13:41:35+0200Domingo Beato

2012-08-03T13:42:32+0200Domingo Beato

2012-08-03T14:10:22+0200Ana Martinez-Vara de Reypor ausencia

2012-08-03T14:10:37+0200Ana Martinez-Vara de Reypor ausencia

KHU-10-YE_-EFE-EA_-000

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