ISP Relay Setting Calculation and Charts-LBDS9_15.08.11

CONSORTIUM

Subject. - Relay Setting Calculation – Doc. No. ISP/AREVA-EMC-A/IX/22/16/29/DE/1007J Project LBDS Package – 22 - New Stream 2.5 MT Expansions at IISCO Steel Plant Page- 1

RELAY SETTING CALCULATION FOR OVERCURRENT AND VOLTAGE OPERATED

RELAYS OF LBDS-9

SAIL, ISP Package-22Relay Setting Calculation & Charts

Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

1.0

a 33

b 800/1 A

d 800 A

e 11650 A

g 34000 KVA

h 594.86 A

f. Relay used MICOM P127

g. Setting ranges : steps

I> 0.1-25In @ 0.01 In

I>> 0.5-40In @ 0.01 In

I>>> 0.5-40In @ 0.01 In

TMS = 0.025-1.5 @ 0.025

Definite time setting = 0-150 sec @ 0.01 sec

2.0 SETTING VALUES

2.1 Proposed Is (IDMT) setting for O/C (51)

a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard Inverse

b. Plug setting (PS) proposed = 1

c. Is = Current in amps corresponding to PS = PS*In 800

d. Proposed TMS setting = 0.550

2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)

a. Minimum Isc setting proposed in multiples M of In 1.75

b. Isc Current in amps corresponding to Isc setting = M*In 1400

c. Proposed DT time in sec = 1.55

2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)

a. Minimum Isc setting proposed in multiples (M) of In 4.5



2.4

Current in Amps Multiples of Set Current

Equivalent MVA

Time of Operation in sec. Zone of Operation

16000 20 914.52 0.65 DT zone

3600 4.5 205.77 0.65 I>>>

3600 4.5 205.77 1.55

3600 4.5 205.77 1.55 DT zone

BASIC DATA

System voltage in kV

Selected CT Ratio =

In = Rated current in amps corresponding to CT ratio of 800/1A =

Minimum symmetrical 3-Ph S/C current in amps at 33 KV bus =

Total load on 33kV bus =

Load current =

Time of Operation for Different Fault Current

A. Setting of Relays For 33 KV I/C

Consultant : SATCON Page 2 of 15



1400 1.75 80.02 1.55 I>>

1400 1.75 80.02 6.84

11650 14.5625 665.89 1.40

8000 10 457.26 1.63

4800 6 274.36 2.11

3200 4 182.90 2.74

1600 2 91.45 5.52

1520 1.9 86.88 5.96 IDMT zone

1440 1.8 82.31 6.51 I>

1400 1.75 80.02 6.84

1360 1.7 77.73 7.22

1280 1.6 73.16 8.15

1200 1.5 68.59 9.46

1120 1.4 64.02 11.40

1040 1.3 59.44 14.64

960 1.2 54.87 21.08

880 1.1 50.30 40.36

2.5

a. 44

b. 2.5

c. 88

d. 2

2.6

a. 121

b. 1

1 RELAY TYPE MICOM P922

1.1 110

1.2

a. 44

b. 2.5

c. 88

d. 2

1.3

a. 121

b. 1

B. Settings of Relays for 33 KV Bus PT

Rated PT secondary voltage (Vn)

Undervoltage protection (27)


V< in volts = 0.4*Vn (I/C brkr trip)

DT setting in sec =

V<< in volts = 0.8*Vn (Annunciation, I/C brkr closing circuit interlock)

DT setting in sec =

V>> in volts = 1.1*Vn (For annunciation)

DT setting in sec =

V<< in volts = 0.8*Vn (I/C and B/C brkr closing circuit interlock)

DT setting in sec =

Overvoltage protection (59)

V> in volts = 1.1*Vn (For annunciation)

DT setting in sec =

V< in volts = 0.4*Vn (I/C and B/C brkr closing circuit interlock)

DT setting in sec =





1.4

a. 6.6

b. 0.05

c. 20

d. 0.1

1.0

a. 33

b. 400/ 1A

c. 400 A

d. 11650 A

e. MICOM P132

f.

0.1-4In

0.1-40In

0.1-40In

0.1-40In

0.05-10

0-100 sec

2.0 SETTING VALUES

2.1 Proposed IDMT setting for O/C (51),

a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b. Plug setting (PS) proposed = 1.5

c. I>1 = Current in amps corresponding to PS = PS*In 600


2.2 Proposed I> (DT) setting for O/C (50-1)

a. Minimum Isc setting proposed in multiples M of In 3



2.3 Proposed I>> (DT) setting for O/C (50-2)




2.4 Proposed I>>> (DT) setting for O/C (50-3)

a. Minimum Isc setting proposed in multiples (M) of In

DT setting in sec =


BASIC DATA


Relay used

IDMT

I> DT

I>> DT


Setting ranges :

I>>> DT

TMS =

Definite time setting =

Not used

Selected CT Ratio =

C. Settings of Relays For 33 KV Bus Coupler

V0> in volts = 0.06*Vn (For Alarm)

DT setting in sec =

V0>> in volts = 0.2*Vn (for tripping of respective I/C)

Residual overvoltage/neutral displacement protection (60)




b. Isc Current in amps corresponding to Isc setting = M*In

c. Proposed DT time in sec =

2.5


Equivalent MVA


8000 20 457.26 0.35 DT zone

3300 8.25 188.62 0.35 I>>

3300 8.25 188.62 1.25 DT zone

1200 3 68.59 1.25 I>

1200 3 68.59 4.76

11650 19.417 665.88 1.09

6000 10 342.95 1.41

3000 5 171.47 2.03

1800 3 102.88 2.99

1200 2 68.59 4.76

1140 1.9 65.16 5.15 IDMT zone

1080 1.8 61.73 5.62

1020 1.7 58.30 6.23

960 1.6 54.87 7.04

900 1.5 51.44 8.17

840 1.4 48.01 9.85

780 1.3 44.58 12.64

720 1.2 41.15 18.20

660 1.1 37.72 34.85

2.6

a. 15o

b. 5.5 5%

c. 0.1

d. 20 > 20%

e. 32 > 30%

1.0

a. 33 kV

b. 600/1 A

c. 600 A

d. 11650 A

e. 2256 A

f. 551 A

BASIC DATA

System voltage

25 Check Synchronisation


Live Bus Voltage setting in volts


Rated primary current in amps of 31.5 MVA Transformer =

Phase angle setting

Vdiff setting in volts


D. Settings of Relays For 33 KV Transformer Feeder

Slip frequency setting in Hz

Dead Bus Charging Voltage setting in volts

Selected CT Ratio =

Reflected current on 33 KV side due to fault at 6.6kV side of trafo and minimum fault level condition =




g. MICOM P122

h. steps

0.1-25In @ 0.01 In

0.5-40In @ 0.01 In

0.5-40In @ 0.01 In

0.025-1.5 @ 0.025

0-150 sec @ 0.01 sec

2.0 SETTING VALUES

2.1 Proposed Is (IDMT) setting for O/C (51), I>

a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b. Plug setting (PS) proposed = 1

c. Is = Current in amps corresponding to PS = PS*In 600


2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)




2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)

a. Minimum Isc setting proposed in multiples (M) of In 5



2.4 Time of Operation for Different Fault Current


Equivalent MVA


12000 20 685.89 0.05 DT Zone

3000 5 171.47 0.05 (I>>>)

3000 5 171.47 0.95

3000 5 171.47 0.95 DT Zone

900 1.5 51.44 0.95 (I>>)

900 1.5 51.44 5.59

11650 19.42 665.89 0.74

6000 10.00 342.95 0.97

4200 7.00 240.06 1.15

3000 5.00 171.47 1.39

2256 3.76 128.95 1.70

I>>

I>>>

TMS =


I>

Relay used

Setting ranges :




1200 2.00 68.59 3.26 IDMT zone

1140 1.9 65.16 3.52 I>

1080 1.8 61.73 3.85

1020 1.7 58.30 4.26

960 1.6 54.87 4.82

900 1.5 51.44 5.59

840 1.4 48.01 6.74

780 1.3 44.58 8.65

720 1.2 41.15 12.46

660 1.1 37.72 23.85

1.0

a. 6.6 kV

b. 3000/1 A

c. 3000 A

d. 11280 A

e. 2256 A

f. 2756 A

g. MICOM P632

h.

0.1-4 In

0.1-30 In

0.1-30 In

0.05 - 10

0-100 sec

2.0 SETTING VALUES

2.1 Proposed IDMT setting for O/C (51),

a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b. Plug setting (PS) proposed = 0.9c. I>1 = Current in amps corresponding to PS = PS*In 2700


2.2 Proposed I> (DT) setting for O/C (50-1)


b. Isc Current in amps corresponding to Isc setting = M*In 4500c. Proposed DT time in sec = 0.65

2.3 Proposed I>> (DT) setting for O/C (50-2)a. Minimum Isc setting proposed in multiples M of In


Relay used

Not used

System voltage

Selected CT Ratio =

I>>> (DT-2)

TMS =

Rated primary current (at 6.6kV) in amps of 31.5 MVA Transformer =

Setting ranges for overcurrent relays :

I> (IDMT)

E. Settings of Relays for 6.6 KV I/C From 25/31.5 MVA Trafo

Reflected current on 33 KV side due to fault on 6.6kV side of trafo and minimum fault level condition =



Minimum symmetrical 3-Ph S/C current in amps at 6.6 KV bus =

BASIC DATA

I>> (DT-1)





2.4


Equivalent MVA


60000 20 685.89 0.65 DT zone

4500 1.5 51.44 0.65 I>>

4500 1.5 51.44 3.75

27000 10 308.65 0.82

24300 9 277.79 0.86

18900 7 216.06 0.97

10800 4 123.46 1.37

11280 4.1777 128.95 1.33

8100 3 92.60 1.73

5400 2 61.73 2.76

5130 1.9 58.64 2.98 IDMT zone

4860 1.8 55.56 3.26 I>

4590 1.7 52.47 3.61

4500 1.6666 51.44 3.75

4320 1.6 49.38 4.08

4050 1.5 46.30 4.73

3780 1.4 43.21 5.70

3510 1.3 40.12 7.32

3240 1.2 37.04 10.54

2970 1.1 33.95 20.18

2.5

a. 44

b. 2.5

c. 88

d. 2

2.6

a. 121

b. 1

2.7 Transformer Differential Protection (87T) Available range

a. 0.3 0.2-0.5

b. 0.8 0.4-1.5

c. 2756

d. 551 0.1-2.5 x I ref

e. 27556 5-30 x I ref

f. 55112 5-30 x I ref

Idiff>> in amps = 10 x I ref

V<< in volts = 0.8*Vn (Annunciation, I/C brkr closing circuit interlock)

DT setting in sec =

m1

m2

I ref = Trafo full load current in amps on 31.5 MVA base (FLC)

Idiff> in amps = 0.2 x I ref

Idiff>>> in amps = 20 x I ref

V> in volts = 1.1*Vn (For annunciation)

DT setting in sec =


V< in volts = 0.4*Vn (I/C brkr trip)

DT setting in sec =






g. 11022 1.5-10 x I ref

h. 551 0.1-0.5 x I ref

1.0a. 6.6

b. 1500/ 1A

c. 1500 A

d. 11280 A

e. MICOM P132f.

0.1-4In

0.1-40In

0.1-40In

0.1-40In

0.05-10

0-100 sec

2.0 SETTING VALUES

2.1 Proposed IDMT setting for O/C (51),a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverseb. Plug setting (PS) proposed = 1c. I>1 = Current in amps corresponding to PS = PS*In 1500d. Proposed TMS setting = 0.275

2.2 Proposed I> (DT) setting for O/C (50-1)a. Minimum Isc setting proposed in multiples M of In 1.5



2.3 Proposed I>> (DT) setting for O/C (50-2)a. Minimum Isc setting proposed in multiples M of In 3

b. Isc Current in amps corresponding to Isc setting = M*In 4500c. Proposed DT time in sec = 0.35

2.4 Proposed I>>> (DT) setting for O/C (50-3)a. Minimum Isc setting proposed in multiples (M) of In



2.5


Equivalent MVA


30000 20 342.95 0.35 DT zone




Selected CT Ratio =

BASIC DATA

F. Settings of Relays for 6.6 KV Bus Coupler

IRm2 in amps = 4 x I ref

Rush I in amps = 0.2 x I ref

TMS =


Setting ranges :

I> DT

IDMT

I>> DT

I>>> DT

Relay used


Not used




4500 3 51.44 0.35 I>>

4500 3 51.44 1.30 DT zone

2250 1.5 25.72 1.30 I>

2250 1.5 25.72 4.73

11280 7.520 128.95 0.93

4500 3 51.44 1.73

3750 2.5 42.87 2.08

3000 2 34.29 2.76

2850 1.9 32.58 2.98 IDMT zone

2700 1.8 30.87 3.26

2550 1.7 29.15 3.61

2400 1.6 27.44 4.08

2250 1.5 25.72 4.73

2100 1.4 24.01 5.70

1950 1.3 22.29 7.32

1800 1.2 20.58 10.54

1650 1.1 18.86 20.18

2.6

a. 15o

b. 5.5 5%

c. 0.1

d. 20 > 20%e. 32 > 30%

1.0a 6.6

b 125/1 A

d 125 A

e 11280 A

g 250 KVAR

h 21.87 A

f. Relay used MICOM P127

g. Setting ranges : steps

I> 0.1-25In @ 0.01 In

I>> 0.5-40In @ 0.01 In

I>>> 0.5-40In @ 0.01 In

TMS = 0.025-1.5 @ 0.025

Definite time setting = 0-150 sec @ 0.01 sec

2.0 SETTING VALUES

Selected CT Ratio =


25 Check Synchronisation

Vdiff setting in volts

Slip frequency setting in Hz

Dead Bus Charging Voltage setting in volts

BASIC DATA

Phase angle setting


Capacitor bank rating =

Live Bus Voltage setting in volts

G. Settings of Relays for 6.6 KV O/G Fdr to Capacitor bank

Load current =





2.1 Proposed Is (IDMT) setting for O/C (51)a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard Inverse


c. Is = Current in amps corresponding to PS = PS*In 28.125


2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)a. Minimum Isc setting proposed in multiples M of In 4



2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)a. Minimum Isc setting proposed in multiples (M) of In



2.4


Equivalent MVA


2500 20 28.58 0.05 DT zone

500 4 5.72 0.05 I>>

500 4 5.72 0.47

500 17.7777 5.72 0.47

281 10 3.22 0.59

169 6 1.93 0.77

113 4 1.29 1.00

56 2 0.64 2.01 IDMT zone

53 1.9 0.61 2.17 I>

51 1.8 0.58 2.37

48 1.7 0.55 2.62

45 1.6 0.51 2.96

42 1.5 0.48 3.44

39 1.4 0.45 4.15

37 1.3 0.42 5.32

34 1.2 0.39 7.66

31 1.1 0.35 14.67

2.5

a. 88 Bus PT supply =110V

b. 1.00

2.6a. 6.6 Bus PT supply =110V

b. 0.05

U< in volts = 0.8*Vn (For tripping)

DT setting in sec =

Residual overvoltage/neutral displacement protection (60)Ue> in volts = 0.06*Vn (For Alarm)

DT setting in sec =


Not used





c. 22

d. 0.1

1.0

a. 6.6 kV

b. 250/1 A

c. 250 A

d. 11280 A

e. 2165 A

f. 140 A

g. MICOM P122

h. steps

0.1-25In @ 0.01 In

0.5-40In @ 0.01 In

0.5-40In @ 0.01 In

0.025-1.5 @ 0.025

0-150 sec @ 0.01 sec

2.0 SETTING VALUES

2.1 Proposed Is (IDMT) setting for O/C (51), I>a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b. Plug setting (PS) proposed = 0.75c. Is = Current in amps corresponding to PS = PS*In 187.5


2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)a. Minimum Isc setting proposed in multiples M of In 0.9


c. Proposed DT time in sec = 1

2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)a. Minimum Isc setting proposed in multiples (M) of In 11.5





Equivalent MVA


5000 20 57.16 0.05 DT Zone

2875 11.5 32.87 0.05 (I>>>)

2875 11.5 32.87 1.00

BASIC DATA


Reflected current on 6.6 KV side due to fault on 415V side of trafo and minimum fault level condition =

DT setting in sec =


Ue>> in volts = 0.2*Vn (For tripping)

I>>

Selected CT Ratio =

System voltage

H. Settings of Relays for 6.6 KV O/G Fdr to 1600 KVA Transformer

Rated primary current in amps of 1600 KVA Transformer =

TMS =


Relay used

Setting ranges :

I>

I>>>




2875 11.5 32.87 1.00 DT Zone

225 0.9 2.57 1.00 (I>>)

225 0.9 2.57 14.37

11280 60.16 128.95 0.61

2165 11.55 24.75 1.05

1688 9.00 19.29 1.17

938 5.00 10.72 1.60

375 2.00 4.29 3.76

356 1.9 4.07 4.06 IDMT zone

338 1.8 3.86 4.44 I>

319 1.7 3.64 4.92

300 1.6 3.43 5.56

281 1.5 3.22 6.45

263 1.4 3.00 7.78

244 1.3 2.79 9.98

225 1.2 2.57 14.37

206 1.1 2.36 27.52

1 RELAY TYPE MICOM P922

1.1 110

1.2

a. 44b. 2.5

c. 88

d. 2

1.3

a. 121

b. 1

1.4

a. 6.6

b. 0.05

c. 20

d. 0.1

1.0 BASIC DATA


Rated PT secondary voltage (Vn)


V0>> in volts = 0.2*Vn (for tripping of respective I/C)

DT setting in sec =

V> in volts = 1.1*Vn (For annunciation and tripping of capacitor feeders)

DT setting in sec =

Residual overvoltage/neutral displacement protection (60)

V0> in volts = 0.06*Vn (For Alarm)

DT setting in sec =

V< in volts = 0.4*Vn (I/C and B/C brkr closing circuit interlock)DT setting in sec =

V<< in volts = 0.8*Vn (I/C and B/C brkr closing circuit interlock, u/v trip of motor feeders)

DT setting in sec =

J. Settings of Relays for IC & BC at 415V PCC

I. Settings of Relays for 6.6 KV Bus PT




a. System voltage in kV 0.415 kV

b. Selected CT Ratio = 3000/5 A

c. 33007 A

d. 3000 A

e. Relay used SPAJ 140C (ABB)

f. Setting ranges :

I> inverse 0.5 - 2.5 In

I> definite time 0.5 - 5.0 In

I>> definite time 0.5 - 40.0 In and infinity

TMS = 0.05 - 1.0

Definite time setting for I> = 0.05 - 300s

Definite time setting for I>> = 0.04 - 300s

g. Transformer rating = 1600 kVA

h. Voltage ratio = 6600/433 V

i. Transformer full load current, HV = 140 A

j. Transformer full load current, LV = 2133 A

k. Transformer vector group = Dyn11

l. Transformer % impedance = 6.25%

m. Through fault current at LV side = 33007 A (From ETAP output)

n. Through fault current at HV side = 2165.46 A

2.0 SETTING VALUES

2.1 Proposed I> (IDMT) setting for O/C (51),

a. Curve used for I> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse


c. I> = Current in amps corresponding to PS = PS*In 2550


2.2 Proposed I> (DT) setting for O/C (50) 1.1

a. Minimum Isc setting proposed in multiples M of In 3300

b. Isc Current in amps corresponding to Isc setting = M*In 0.7 (Assumed)


2.3 Proposed I>> (DT) setting for O/C (50)

a. Minimum Isc setting proposed in multiples (M) of In




Symmetrical S/C current in amps at 415V bus during 3phase fault =

In = Rated primary current in amps corresponding to selected CT ratio

Not used




CURRENT IN AMPS (I)

MULTIPLES OF SET CURRENT (M)

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

I = MxIs M MVA sec

60000 20 43.13 0.7 DT Zone

3300 1.1 2.37 0.7 (I>>)

3300 1.1 2.37 7.45

33007 12.9439 23.73 0.73

25500 10 18.33 0.82

22950 9 16.50 0.86

20400 8 14.66 0.91

17850 7 12.83 0.97

15300 6 11.00 1.06

12750 5 9.16 1.18 IDMT Zone

10200 4 7.33 1.37 (I>)

7650 3 5.50 1.73

5100 2 3.67 2.76

4845 1.9 3.48 2.98

4590 1.8 3.30 3.26

4335 1.7 3.12 3.61

4080 1.6 2.93 4.08

3825 1.5 2.75 4.73

3570 1.4 2.57 5.70

3315 1.3 2.38 7.32

3300 1.29411 2.37 7.45

3060 1.2 2.20 10.54

2805 1.1 2.02 20.18

2.5a. Relay used VAGM22

b. 40-80 %

c. Inst.

d. 40 %

e. Tripping & Annc.

2.6

a. VAGM22

b. 110-140 %

c. Inst.

d. 110 %

e. Tripping

Time =

Selected setting =

Purpose

Available setting =

Time =

Selected setting =

Purpose

Available setting =

Overvoltage protection (59) at incomer

Relay used

Undervoltage protection (27) at incomer


OVERCURRENT COORDINATION CHART FOR LBDS-9

10

1

TIM

E IN

SEC

ON

DSTI

ME

IN S

ECO

NDS

0.1

0.01

1.00 10.00 100.00 1000.00MVA

33kV INCOMER 33KV BUS COUPLER 33KV TRAFO FDR 6.6KV INCOMER

6.6KV BUS COUPLER 6.6KV TRAFO FDR LTPCC 415V PCC INCOMER

CONSORTIUM

Subject. - Relay Setting Calculation – Doc. No. ISP/AREVA-EMC-A/IX/22/16/29/DE/1007J Project LBDS Package – 22 - New Stream 2.5 MT Expansions at IISCO Steel Plant Page- 1

RELAY SETTING CALCULATION FOR EARTH FAULT RELAYS OF LBDS-9


Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

A. 33kV INCOMER

1.0 BASIC DATA


1.0 BASIC DATA

a. System voltage in kV 33 kV


c. 400 A

d. 800 A

e. Relay used MICOM P127

f. Setting ranges :

Symmetrical S/C current in amps at 6.6kV bus during SLG fault =

Rated primary current in amps corresponding to selected CT ratio, In =

f. Setting ranges :

Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025

Definite time setting = 0 - 150 sec @ 0.01 sec

2.0 SETTING VALUES

2.1 Proposed Ie> (IDMT) setting for E/F (51N),2.1 Proposed Ie> (IDMT) setting for E/F (51N),

a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse


c. Ie> = Current in amps corresponding to PS = PS*In 120


2.2 Proposed Ie>> (DT) setting for E/F (50N)





CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

16000 20 914.52 0.7 DT Zone

200 0.25 11.43 0.7 (Ie>>)

200 0.25 11.43 2.05

2400 20 137.18 0.34

1800 15 102.88 0.38

1200 10 68.59 0.451200 10 68.59 0.45

1080 9 61.73 0.47

960 8 54.87 0.49

840 7 48.01 0.53

720 6 41.15 0.58 IDMT Zone

600 5 34.29 0.64 (Ie>)

480 4 27.44 0.75

400 3.3333 22.86 0.86

360 3 20.58 0.95

240 2 13.72 1.50




228 1.9 13.03 1.63

216 1.8 12.35 1.78

204 1.7 11.66 1.97


204 1.7 11.66 1.97

200 1.6666 11.43 2.05

192 1.6 10.97 2.22

180 1.5 10.29 2.58

168 1.4 9.60 3.11

156 1.3 8.92 3.99

144 1.2 8.23 5.75

132 1.1 7.54 11.01132 1.1 7.54 11.01

B. 33kV BUS COUPLER

1.0 BASIC DATA



c. 400 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault = c. 400 A

d. 400 A


f. Setting ranges :

Ie> 0.01 - 4.0 In (Inverse time)Ie>> 0.002 - 8.0 In (Definite time)



Ie>> 0.002 - 8.0 In (Definite time)TMS = 0.05 - 10

Definite time setting = 0 - 100 sec

2.0 SETTING VALUES

2.1 Proposed Ie> (IDMT) setting for E/F (51N),


b. Plug setting (PS) proposed = 0.2b. Plug setting (PS) proposed = 0.2








CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

8000 20 457.26 0.4 DT Zone

160 0.4 9.15 0.4 (Ie>>)

160 0.4 9.15 1.25




800 10 45.73 0.37

720 9 41.15 0.39


720 9 41.15 0.39

640 8 36.58 0.41

560 7 32.01 0.44

480 6 27.44 0.48 IDMT Zone

400 5 22.86 0.53 (Ie>)

240 3 13.72 0.79

160 2 9.15 1.25

152 1.9 8.69 1.35152 1.9 8.69 1.35

144 1.8 8.23 1.48

136 1.7 7.77 1.64

128 1.6 7.32 1.85

120 1.5 6.86 2.15

112 1.4 6.40 2.59

104 1.3 5.94 3.33

96 1.2 5.49 4.7996 1.2 5.49 4.79

88 1.1 5.03 9.17

C. 33kV TRANSFORMER FEEDER FOR 25/31.5 MVA TRAFO

1.0 BASIC DATA



c. 400 A

d. 600 A


f. Setting ranges :

Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)



(Inverse time)Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025


2.0 SETTING VALUES














CURRENT IN AMPS (I)

MULTIPLES OF SET CURRENT

EQUIVALENT MVA

TIME OF OPERATIOM

ZONE OF OPERATION


AMPS (I) SET CURRENT (M)

MVA OPERATIOM (sec)

OPERATION

I = MxIs M MVA sec

12000 20 685.89 0.1 DT Zone

120 0.2 6.86 0.1 (Ie>>)

120 0.2 6.86 0.50

1200 20 68.59 0.11

900 15 51.44 0.13

600 10 34.29 0.15

540 9 30.87 0.16

480 8 27.44 0.16

420 7 24.01 0.18

400 6.6666 22.86 0.18

360 6 20.58 0.19 IDMT Zone

300 5 17.15 0.21 (Ie>)300 5 17.15 0.21 (Ie>)

240 4 13.72 0.25

180 3 10.29 0.32

120 2 6.86 0.50

114 1.9 6.52 0.54

108 1.8 6.17 0.59

102 1.7 5.83 0.66

96 1.6 5.49 0.7496 1.6 5.49 0.74

90 1.5 5.14 0.86

84 1.4 4.80 1.04

78 1.3 4.46 1.33

72 1.2 4.12 1.92

66 1.1 3.77 3.67

D. 6.6KV INCOMER FROM 25/31.5 MVA TRAFOD. 6.6KV INCOMER FROM 25/31.5 MVA TRAFO

1.0 BASIC DATA



c. 600 A

d. 3000 A

Symmetrical S/C current in amps at 415V bus during SLG fault =



f. Setting ranges :

Ie> 0.1 - 0.8 In (Inverse time)Ie>> 0.1 - 8 In (Definite time)TMS = 0.05 - 10


2.0 SETTING VALUES


In =















CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

60000 20 685.89 0.7 DT Zone

360 0.12 4.12 0.7 (Ie>>)360 0.12 4.12 0.7 (Ie>>)

360 0.12 4.12 2.87

3000 10 34.29 0.22

2700 9 30.87 0.23

2400 8 27.44 0.25

2100 7 24.01 0.26

1800 6 20.58 0.291800 6 20.58 0.29

1500 5 17.15 0.32 IDMT Zone

1200 4 13.72 0.37 (Ie>)

900 3 10.29 0.47

600 2 6.86 0.75

570 1.9 6.52 0.81

540 1.8 6.17 0.89

510 1.7 5.83 0.98

480 1.6 5.49 1.11

450 1.5 5.14 1.29

420 1.4 4.80 1.56

390 1.3 4.46 2.00

375 1.25 4.29 2.35

360 1.2 4.12 2.87

330 1.1 3.77 5.50

2.4

a. 300

b. 1.005 (fixed slope)

E. BACK UP E/F (51G) AT 25/31.5 MVA TRAFO NEUTRAL

1.0 BASIC DATA



REF (64R) [Biasing by residual current] Instantaneous

Idiff> in amps = 0.1*FLC

m =




c. 36950 A (Based on ETAP fault calculation)

d. 600 A


Rated primary current in amps corresponding to selected CT ratio,


d. 600 A


f. Setting ranges :

Ie> 0.01 - 1.0 In (Inverse time)TMS = 0.025 - 1.2


2.0 SETTING VALUES

2.1 Proposed Ie> (IDMT) setting for E/F (51G),

a Curve used for Ie>1 (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b Plug setting (PS) proposed = 0.55

c Ie> = Current in amps corresponding to PS = PS*In 330

d Proposed TMS setting = 0.1

2.2 Time of Operation for Different Fault Current2.2 Time of Operation for Different Fault Current

CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

6600 20 75.45 0.23

4950 15 56.59 0.254950 15 56.59 0.25

3300 10 37.72 0.30

2970 9 33.95 0.31

2640 8 30.18 0.33

2310 7 26.41 0.35

1980 6 22.63 0.38

1650 5 18.86 0.43

1320 4 15.09 0.50 IDMT Zone 1320 4 15.09 0.50 IDMT Zone

990 3 11.32 0.63 (Ie>)

660 2 7.54 1.00

627 1.9 7.17 1.08

600 1.8181 6.86 1.16

594 1.8 6.79 1.18

561 1.7 6.41 1.31

528 1.6 6.04 1.48528 1.6 6.04 1.48

495 1.5 5.66 1.72

462 1.4 5.28 2.07

429 1.3 4.90 2.66

396 1.2 4.53 3.83

363 1.1 4.15 7.34

F. 6.6kV BUS COUPLER

1.0 BASIC DATA






c. 600 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault =


d. 1500 A


f. Setting ranges :

Ie> 0.01 - 4.0 In (Inverse time)Ie>> 0.002 - 8.0 In (Definite time)TMS = 0.05 - 10


TMS = 0.05 - 10


2.0 SETTING VALUES




c. Ie> = Current in amps corresponding to PS = PS*In 135c. Ie> = Current in amps corresponding to PS = PS*In 135







CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

30000 20 342.95 0.4 DT Zone

225 0.15 2.57 0.4 (Ie>>)225 0.15 2.57 0.4 (Ie>>)

225 0.15 2.57 1.36

1350 10 15.43 0.30

1215 9 13.89 0.31

1080 8 12.35 0.33

945 7 10.80 0.35

810 6 9.26 0.38


600 4.4444 6.86 0.46 (Ie>)

405 3 4.63 0.63

270 2 3.09 1.00

257 1.9 2.93 1.08

243 1.8 2.78 1.18

225 1.66666 2.57 1.36

216 1.6 2.47 1.48

203 1.5 2.31 1.72

189 1.4 2.16 2.07




176 1.3 2.01 2.66

162 1.2 1.85 3.83

149 1.1 1.70 7.34


149 1.1 1.70 7.34

G. 6.6kV TRANSFORMER FEEDER FOR LTPCC

1.0 BASIC DATA



c. 600 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault = c. 600 A

d. 250 A


f. Setting ranges :

Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)Ie>> 0.1 - 8 In @ 0.005 In



Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025


2.0 SETTING VALUES









c. Proposed DT time in sec = 0.1c. Proposed DT time in sec = 0.1


CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

5000 20 57.16 0.1 DT Zone 5000 20 57.16 0.1 DT Zone

50 0.2 0.57 0.1 (Ie>>)

50 0.2 0.57 0.75

600 24 6.86 0.16

375 15 4.29 0.19

250 10 2.86 0.22

225 9 2.57 0.23

200 8 2.29 0.25

175 7 2.00 0.26

150 6 1.71 0.29 IDMT Zone




125 5 1.43 0.32 (Ie>)

100 4 1.14 0.37

75 3 0.86 0.47


75 3 0.86 0.47

50 2 0.57 0.75

48 1.9 0.54 0.81

45 1.8 0.51 0.89

43 1.7 0.49 0.98

40 1.6 0.46 1.11

38 1.5 0.43 1.29

35 1.4 0.40 1.5635 1.4 0.40 1.56

33 1.3 0.37 2.00

30 1.2 0.34 2.87

28 1.1 0.31 5.50

H. 415V INCOMER AND BUS COUPLER

1.0 BASIC DATA1.0 BASIC DATA



c. 36950 A (Based on ETAP fault calculation)

d. 3000 A

e. Relay used SPAJ 140C



e. Relay used SPAJ 140C

f. Setting ranges :

Ie> 0.1 - 0.8 In (Inverse time)Ie>> 0.1 - 10 In (Definite time)TMS = 0.05 - 1.0

Definite time setting = 0.05 - 300 sec

2.0 SETTING VALUES







a. Minimum Isc setting proposed in multiples M of In 0.12a. Minimum Isc setting proposed in multiples M of In 0.12




CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION

I = MxIs M MVA sec

60000 20 43.13 0.7 DT Zone




360 0.12 0.26 0.7 (Ie>>)

360 0.12 0.26 20.12


36950 123.1666 26.56 0.73

4500 15 3.23 1.32

3000 10 2.16 1.56

2700 9 1.94 1.64

2400 8 1.73 1.73

2100 7 1.51 1.85


1500 5 1.08 2.25 (Ie>)

1200 4 0.86 2.61

900 3 0.65 3.31

600 2 0.43 5.27

570 1.9 0.41 5.69

540 1.8 0.39 6.22

510 1.7 0.37 6.89510 1.7 0.37 6.89

480 1.6 0.35 7.78

450 1.5 0.32 9.03

420 1.4 0.30 10.89

390 1.3 0.28 13.97

375 1.25 0.27 16.43

360 1.2 0.26 20.12

330 1.1 0.24 38.52

J. BACK UP E/F (51G) AT 1.6 MVA TRAFO NEUTRAL

1.0 BASIC DATA



c. 36950 A (Based on ETAP fault calculation)Symmetrical S/C current in amps at 415V bus during SLG fault =

d. 500 A

e. Relay used CDG 11 (3 sec version)

f. Setting ranges :

Ie> 0.2 - 0.8 In (Inverse time)TMS = 0.1 - 1.0


2.0 SETTING VALUES

2.1 Proposed Ie> (IDMT) setting for E/F (51G),

a Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse

b Plug setting (PS) proposed = 0.6

c Ie> = Current in amps corresponding to PS = PS*In 300

d Proposed TMS setting = 0.75





CURRENT IN AMPS (I)


EQUIVALENT MVA


ZONE OF OPERATION


(M) (sec)

I = MxIs M MVA sec

36950 123.1666 26.56 1.04

4500 15 3.23 1.89

3000 10 2.16 2.23

2700 9 1.94 2.34

2400 8 1.73 2.47

2100 7 1.51 2.652100 7 1.51 2.65

1800 6 1.29 2.88

1500 5 1.08 3.21

1200 4 0.86 3.73 IDMT Zone

900 3 0.65 4.73 (Ie>)

600 2 0.43 7.52

570 1.9 0.41 8.13

540 1.8 0.39 8.88540 1.8 0.39 8.88

510 1.7 0.37 9.84

480 1.6 0.35 11.12

450 1.5 0.32 12.90

420 1.4 0.30 15.55

390 1.3 0.28 19.96

360 1.2 0.26 28.74

330 1.1 0.24 55.03330 1.1 0.24 55.03


EARTH FAULT PROTECTION COORDINATION CURVES FOR 415V

Consultant : SATCON

0.1

1

10

100

0.10 1.00 10.00 100.00

415V Incomer Back Up 51G SLGF fault Current 36950A

SLG

Faul

t Cur

rent

=

3695

0A

MVA

TIM

E IN

SEC

EARTH FAULT PROTECTION COORDINATION CURVES FOR 6.6KV

Consultant : SATCON

0.1

1

10

0.10 1.00 10.00 100.00 1000.00

6.6kV TRAFO FDR 6.6KV BUS COUPLER 6.6KV INCOMER 51G at 6.6kV NEUTRAL 600A SLG FAULT

600A

SLG

MVA

TIM

E IN

SEC

EARTH FAULT PROTECTION COORDINATION CURVES FOR 33KV

Consultant : SATCON

0.1

1

10

100

1.00 10.00 100.00 1000.00

33kV TRAFO FDR 33KV BUS COUPLER 400A SLG FAULT 33KV INCOMER

400A

SLG

Faul

t Cu

rren

t

MVA

TIM

E IN

SEC

Location: BURNPUR

Engineer: SATCONStudy Case: SC

7.0.0C

Page: 1

SN: SATCON2007

Filename: LBDS9LT

Project: ISP MODERNISATION ETAP

Contract: AREVA

Date: 07-08-2011

Revision: Base

Config.: Normal

SHORT CIRCUIT CALCULATION AT LT BUS

Short-Circuit Summary Report

3-Phase, LG, LL, LLG Fault Currents

ID kV

Bus

I"k ip Ik I"k I"k Ikip ip I"kIb Ib Ib

3-Phase Fault Line-to-Ground Fault Line-to-Line Fault *Line-to-Line-to-Ground

Ik ip Ik

LV SWBD 0.433 33.007 79.775 33.007 36.954 89.314 36.954 36.954 28.585 69.087 28.585 28.585 86.248 35.685 35.685 35.685

All fault currents are in rms kA. Current ip is calculated using Method C.

* LLG fault current is the larger of the two faulted line currents.

Location: BURNPUR

Engineer: SATCONStudy Case: SC

7.0.0C

Page: 2

SN: SATCON2007

Filename: LBDS9LT

Project: ISP MODERNISATION ETAP

Contract: AREVA

Date: 07-08-2011

Revision: Base

Config.: Normal

SHORT CIRCUIT CALCULATION AT LT BUS

Sequence Impedance Summary Report

ID kV

Bus

Resistance Reactance Impedance

Positive Seq. Imp. (ohm) Negative Seq. Imp. (ohm)


Zero Seq. Imp. (ohm)


Fault Zf (ohm)


LV SWBD 0.433 0.00093 0.00790 0.00795 0.00075 0.00535 0.00541 0.00093 0.00790 0.00795 0.00000 0.00000 0.00000

One-Line Diagram - OLV1 (Short-Circuit Analysis - 3 PHASE FAULT)

page 1 10:37:45 Aug 07, 2011 Project File: LBDS9LT

LV SWBD0.433 kV

33.0 kA

MV SWBD6.6 kV

5.28 kV

6.6KV BUS129 MVAsc

2.17

T1

6.25 %Z6.6/0.433 kV

DS 1.6 MVA

33.01

LV LOAD1.2 MVALV LOAD1.2 MVA

6.6KV BUS129 MVAsc

T1

6.25 %Z6.6/0.433 kV

DS 1.6 MVA

MV SWBD6.6 kV

LV SWBD0.433 kV

33.0 kA

5.28 kV

2.17

33.01

One-Line Diagram - OLV1 (Short-Circuit Analysis - SLG FAULT)

page 1 10:38:58 Aug 07, 2011 Project File: LBDS9LT

LV SWBD0.433 kV

0.23 kV

36.95 kA

MV SWBD6.6 kV

3.81 kV

6.6KV BUS129 MVAsc

T1

6.25 %Z6.6/0.433 kV

DS 1.6 MVA

36.95

LV LOAD1.2 MVA

LV SWBD0.433 kV

0.23 kV

36.95 kA

MV SWBD6.6 kV

3.81 kV

6.6KV BUS129 MVAsc

T1

6.25 %Z6.6/0.433 kV

DS 1.6 MVA

36.95

LV LOAD1.2 MVA

Documents

ISP Relay Setting Calculation and Charts-LBDS9_15.08.11