ISP Relay Setting Calculation and Charts-LBDS9_15.08.11

CONSORTIUM

RELAY SETTING CALCULATION FOR OVERCURRENT AND VOLTAGE OPERATED RELAYS OF LBDS-9

Subject. Project

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

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

A. Setting of Relays For 33 KV I/C 1.0 BASIC DATA a

System voltage in kV

33

b

Selected CT Ratio =

800/1

A

d

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

800

A

e

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

11650

A

g

Total load on 33kV bus =

34000

KVA

h

Load current =

594.86

A

f.

Relay used

g.

Setting ranges :

MICOM P127 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}]

b.

Plug setting (PS) proposed =

c.

Is = Current in amps corresponding to PS = PS*In

d.

Proposed TMS setting =

IEC SI

Standard Inverse

1 800 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

b.

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

3600

c.

Proposed DT time in sec =

0.65

2.4 Time of Operation for Different Fault Current 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

Consultant : SATCON

DT zone

Page 2 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 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 Undervoltage protection (27) a.

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

44

b.

DT setting in sec =

2.5

c.

V in volts = 1.1*Vn (For annunciation)

b.

DT setting in sec =

121 1

B. Settings of Relays for 33 KV Bus PT 1

RELAY TYPE

1.1 Rated PT secondary voltage (Vn)

MICOM P922 110

1.2 Undervoltage protection (27) a.

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

44

b.

DT setting in sec =

2.5

c.

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

b.

DT setting in sec =

Consultant : SATCON

121 1

Page 3 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

1.4 Residual overvoltage/neutral displacement protection (60) a.

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

6.6

b.

DT setting in sec =

0.05

c.

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

20

d.

DT setting in sec =

0.1

C. Settings of Relays For 33 KV Bus Coupler 1.0 BASIC DATA a.

System voltage in kV

33

b.

Selected CT Ratio =

400/ 1A

c.

In = Rated current in amps corresponding to CT ratio of 1500/1A =

d.

Minimum symmetrical 3-Ph S/C current in amps at 11 KV bus =

e.

Relay used

f.

Setting ranges :

400

A

11650

A

MICOM P132

IDMT

0.1-4In

I> DT

0.1-40In

I>> DT

0.1-40In

I>>> DT

0.1-40In

TMS = Definite time setting =

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}]

b.

Plug setting (PS) proposed =

c.

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

d.

Proposed TMS setting =

IEC SI

Standard inverse

1.5 600 0.475

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

Minimum Isc setting proposed in multiples M of In

b.

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

1200

c.

Proposed DT time in sec =

1.25

3

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

Minimum Isc setting proposed in multiples M of In

8.25

b.

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

3300

c.

Proposed DT time in sec =

0.35

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

Not used

Minimum Isc setting proposed in multiples (M) of In

Consultant : SATCON

Page 4 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J b.

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

c.

Proposed DT time in sec =

2.5 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

Zone of Operation

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

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

IDMT zone

2.6 25 Check Synchronisation o

a.

Phase angle setting

b.

Vdiff setting in volts

15 5.5

5%

c.

Slip frequency setting in Hz

0.1

d.

Dead Bus Charging Voltage setting in volts

20

> 20%

e.

Live Bus Voltage setting in volts

32

> 30%

D. Settings of Relays For 33 KV Transformer Feeder 1.0 BASIC DATA a.

System voltage

b.

Selected CT Ratio =

33

kV

600/1

A

c.

In = Rated current in amps corresponding to CT ratio of 250/1A =

600

A

d.

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

11650

A

e.

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

2256

A

f.

Rated primary current in amps of 31.5 MVA Transformer =

551

A

Consultant : SATCON

Page 5 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

g.

Relay used

h.

Setting ranges :

MICOM P122 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), I> a.

Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}]

b.

Plug setting (PS) proposed =

c.

Is = Current in amps corresponding to PS = PS*In

d.

Proposed TMS setting =

IEC SI

Standard inverse

1 600 0.325

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

Minimum Isc setting proposed in multiples M of In

1.5

b.

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

900

c.

Proposed DT time in sec =

0.95

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

Minimum Isc setting proposed in multiples (M) of In

5

b.

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

3000

c.

Proposed DT time in sec =

0.05

2.4 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

Zone of Operation

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

Consultant : SATCON

Page 6 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 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

E. Settings of Relays for 6.6 KV I/C From 25/31.5 MVA Trafo 1.0 BASIC DATA a.

System voltage

6.6

kV

b.

Selected CT Ratio =

3000/1

A

c.

In = Rated current in amps corresponding to CT ratio of 250/1A =

3000

A

d.

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

11280

A

e.

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

2256

A

f.

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

2756

A

g.

Relay used

h.

Setting ranges for overcurrent relays :

MICOM P632

I> (IDMT)

0.1-4 In

I>> (DT-1)

0.1-30 In

I>>> (DT-2)

0.1-30 In

TMS =

0.05 - 10

Definite time setting =

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

b. c.

Plug setting (PS) proposed = I>1 = Current in amps corresponding to PS = PS*In

0.9 2700

d.

Proposed TMS setting =

0.275

Standard inverse

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

Minimum Isc setting proposed in multiples M of In

b. c.

Isc Current in amps corresponding to Isc setting = M*In Proposed DT time in sec =

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

1.5 4500 0.65 Not used

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

Consultant : SATCON

Page 7 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J c.

Proposed DT time in sec =

2.4 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

60000

20

685.89

0.65

Zone of Operation 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 Undervoltage protection (27) a.

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

44

b.

DT setting in sec =

2.5

c.

V in volts = 1.1*Vn (For annunciation)

b.

DT setting in sec =

121 1

2.7 Transformer Differential Protection (87T)

Available range

a.

m1

0.3

0.2-0.5

b.

m2

0.8

0.4-1.5

c.

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

d.

Idiff> in amps = 0.2 x I ref

551

e.

Idiff>> in amps = 10 x I ref

27556

5-30 x I ref

f.

Idiff>>> in amps = 20 x I ref

55112

5-30 x I ref

Consultant : SATCON

2756 0.1-2.5 x I ref

Page 8 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J g.

IRm2 in amps = 4 x I ref

h.

Rush I in amps = 0.2 x I ref

11022

1.5-10 x I ref

551

0.1-0.5 x I ref

F. Settings of Relays for 6.6 KV Bus Coupler 1.0 BASIC DATA a. System voltage in kV

6.6

b.

Selected CT Ratio =

c.

In = Rated current in amps corresponding to CT ratio of 1500/1A =

1500

A

d.

Minimum symmetrical 3-Ph S/C current in amps at 11 KV bus =

11280

A

e.

Relay used

f.

Setting ranges :

1500/ 1A

MICOM P132

IDMT

0.1-4In

I> DT

0.1-40In

I>> DT

0.1-40In

I>>> DT

0.1-40In

TMS =

0.05-10

Definite time setting =

0-100 sec

2.0 SETTING VALUES 2.1 a. b. c. d.

Proposed IDMT setting for O/C (51), Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] Plug setting (PS) proposed = I>1 = Current in amps corresponding to PS = PS*In Proposed TMS setting =

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

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

c.

Proposed DT time in sec =

Standard inverse

1.5 2250 1.3

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

IEC SI 1 1500 0.275

3

Isc Current in amps corresponding to Isc setting = M*In Proposed DT time in sec =

4500 0.35 Not used

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

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

c.

Proposed DT time in sec =

2.5 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

30000

20

342.95

0.35

Consultant : SATCON

Zone of Operation DT zone Page 9 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 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

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

IDMT zone

2.6 25 Check Synchronisation a.

Phase angle setting

b.

Vdiff setting in volts

15o 5.5

c.

Slip frequency setting in Hz

0.1

d. e.

Dead Bus Charging Voltage setting in volts Live Bus Voltage setting in volts

20 32

5% > 20% > 30%

G. Settings of Relays for 6.6 KV O/G Fdr to Capacitor bank 1.0 BASIC DATA a System voltage in kV

6.6

b

Selected CT Ratio =

125/1

A

d

In = Rated current in amps corresponding to CT ratio of 125/1A =

125

A

e

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

11280

A

g

Capacitor bank rating =

h

Load current =

f.

Relay used

g.

Setting ranges :

250 21.87

KVAR A

MICOM P127 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

Consultant : SATCON

Page 10 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 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

b.

Plug setting (PS) proposed =

0.225

c.

Is = Current in amps corresponding to PS = PS*In

28.125

d.

Proposed TMS setting =

0.200

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

4

b.

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

500

c.

Proposed DT time in sec =

0.05 Not used

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

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

c.

Proposed DT time in sec =

Standard Inverse

2.4 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

2500

20

28.58

0.05

Zone of Operation 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 Undervoltage protection (27) a. U< in volts = 0.8*Vn (For tripping) b.

DT setting in sec =

88 1.00

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

6.6

b.

0.05

DT setting in sec =

Consultant : SATCON

Bus PT supply =110V

Bus PT supply =110V

Page 11 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J c.

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

22

d.

DT setting in sec =

0.1

H. Settings of Relays for 6.6 KV O/G Fdr to 1600 KVA Transformer 1.0 BASIC DATA a.

System voltage

b.

Selected CT Ratio =

c.

In = Rated current in amps corresponding to CT ratio of 250/1A =

d. e.

6.6

kV

250/1

A

250

A

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

11280

A

2165

A

f.

Reflected current on 6.6 KV side due to fault on 415V side of trafo and minimum fault level condition = Rated primary current in amps of 1600 KVA Transformer =

140

A

g.

Relay used

h.

Setting ranges :

MICOM P122 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), I> a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}]

IEC SI

b. c.

Plug setting (PS) proposed = Is = Current in amps corresponding to PS = PS*In

0.75 187.5

d.

Proposed TMS setting =

0.375

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

b.

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

225

c.

Proposed DT time in sec =

Standard inverse

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

b.

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

2875

c.

Proposed DT time in sec =

0.05

2.4 Time of Operation for Different Fault Current Current in Amps

Multiples of Set Current

Equivalent MVA

Time of Operation in sec.

5000

20

57.16

0.05

Zone of Operation DT Zone

2875

11.5

32.87

0.05

(I>>>)

2875

11.5

32.87

1.00

Consultant : SATCON

Page 12 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 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

I. Settings of Relays for 6.6 KV Bus PT 1

RELAY TYPE

1.1 Rated PT secondary voltage (Vn)

MICOM P922 110

1.2 Undervoltage protection (27) a. b.

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

44 2.5

c.

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

b.

DT setting in sec =

121 1

1.4 Residual overvoltage/neutral displacement protection (60) a.

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

6.6

b.

DT setting in sec =

0.05

c.

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

20

d.

DT setting in sec =

0.1

J. Settings of Relays for IC & BC at 415V PCC 1.0 BASIC DATA Consultant : SATCON

Page 13 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J a.

System voltage in kV

0.415

kV

b.

Selected CT Ratio =

3000/5

A

c.

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

33007

A

d.

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

3000

A

e.

Relay used

f.

Setting ranges :

SPAJ 140C

(ABB)

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 =

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

n.

Through fault current at HV side =

1600

2165.46

kVA

A (From ETAP output) 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}]

b.

Plug setting (PS) proposed =

c.

I> = Current in amps corresponding to PS = PS*In

2550

d.

Proposed TMS setting =

0.275

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

Minimum Isc setting proposed in multiples M of In

b.

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

c.

Proposed DT time in sec =

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

Minimum Isc setting proposed in multiples (M) of In

b.

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

c.

Proposed DT time in sec =

IEC SI

Standard inverse

0.85

1.1 3300 0.7

(Assumed)

Not used

2.4 Time of Operation for Different Fault Current

Consultant : SATCON

Page 14 of 15

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Overcurrent and Voltage operated Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J CURRENT IN AMPS (I)

MULTIPLES OF SET CURRENT (M)

EQUIVALENT TIME OF OPERATIOM MVA (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

2.5 Undervoltage protection (27) at incomer a. Relay used b.

Available setting =

c.

Time =

d.

Selected setting =

e.

Purpose

VAGM22 40-80

%

Inst. 40

%

Tripping & Annc.

2.6 Overvoltage protection (59) at incomer a.

Relay used

VAGM22

b.

Available setting =

110-140

c.

Time =

Inst.

d.

Selected setting =

110

e.

Purpose

Consultant : SATCON

% %

Tripping

Page 15 of 15

OVERCURRENT COORDINATION CHART FOR LBDS-9

TIME IN SECONDS

10

1

0.1

0.01 1.00

10.00

100.00

MVA

33kV INCOMER

33KV BUS COUPLER

33KV TRAFO FDR

6.6KV BUS COUPLER

6.6KV TRAFO FDR LTPCC

415V PCC INCOMER

1000.00 6.6KV INCOMER

CONSORTIUM

RELAY SETTING CALCULATION FOR EARTH FAULT RELAYS OF LBDS-9

Subject. Project

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

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J A.

33kV INCOMER

1.0

BASIC DATA

a.

System voltage in kV

33

kV

b.

Selected CT Ratio =

800/1

A

c.

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

400

A

d.

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

800

A

e.

Relay used

f.

Setting ranges :

2.0

MICOM P127

Ie>

0.1 - 1.0 In

Ie>>

0.1 - 8 In

@ 0.005 In (Inverse time) @ 0.005 In (Definite time)

TMS =

0.025 - 1.5

@ 0.025

Definite time setting =

0 - 150 sec

@ 0.01 sec

SETTING VALUES

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}]

b.

Plug setting (PS) proposed =

0.15

c.

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

120

d.

Proposed TMS setting =

0.15

2.2

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

IEC SI

a.

Minimum Isc setting proposed in multiples M of In

0.25

b.

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

200

c.

Proposed DT time in sec =

0.7

2.3

Standard inverse

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

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

0.45

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

Consultant : SATCON

Page 2 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 228

1.9

13.03

1.63

216 204

1.8

12.35

1.78

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

11.01

B.

33kV BUS COUPLER

1.0

BASIC DATA

a.

System voltage in kV

33

kV

b.

Selected CT Ratio =

400/1

A

c.

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

400

A

d.

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

400

A

e.

Relay used

f.

Setting ranges :

MICOM P132

Ie>

0.01 - 4.0 In

(Inverse 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),

a.

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

b.

Plug setting (PS) proposed =

0.2

c.

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

80

d.

Proposed TMS setting =

IEC SI

0.125

2.2

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

a.

Minimum Isc setting proposed in multiples M of In

0.4

b.

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

160

c.

Proposed DT time in sec =

0.4

2.3

Standard inverse

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

M

MVA

8000

20

457.26

0.4

DT Zone

160

0.4

9.15

0.4

(Ie>>)

160

0.4

9.15

1.25

Consultant : SATCON

sec

Page 3 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

800

10

45.73

0.37

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

1.35

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

4.79

88

1.1

5.03

9.17

C.

33kV TRANSFORMER FEEDER FOR 25/31.5 MVA TRAFO

1.0

BASIC DATA

a.

System voltage in kV

33

kV

b.

Selected CT Ratio =

600/1

A

c.

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

400

A

d.

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

600

A

e.

Relay used

f.

Setting ranges :

MICOM P122

Ie>

0.1 - 1.0 In

Ie>>

0.1 - 8 In

@ 0.005 In (Inverse time) @ 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),

a.

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

b.

Plug setting (PS) proposed =

c.

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

d.

Proposed TMS setting =

2.2

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

IEC SI 60 0.05

a.

Minimum Isc setting proposed in multiples M of In

0.2

b.

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

120

c.

Proposed DT time in sec =

0.1

2.3

Standard inverse

0.1

Time of Operation for Different Fault Current

Consultant : SATCON

Page 4 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

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>)

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

0.74

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 TRAFO

1.0

BASIC DATA

a.

System voltage in kV

6.6

kV

b.

Selected CT Ratio =

3000/1

A

c.

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

600

A

d.

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

3000

A

e.

Relay used

f.

Setting ranges :

MICOM P632

Ie>

0.1 - 0.8 In

(Inverse time)

Ie>>

0.1 - 8 In

(Definite time)

TMS =

0.05 - 10

Definite time setting =

0 - 100

2.0

SETTING VALUES

2.1

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

Consultant : SATCON

sec

Page 5 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J a.

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

IEC SI

b.

Plug setting (PS) proposed =

0.1

c.

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

300

d.

Proposed TMS setting =

0.075

2.2

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

a.

Minimum Isc setting proposed in multiples M of In

0.12

b.

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

360

c.

Proposed DT time in sec =

0.7

2.3

Standard inverse

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

M

MVA

sec

60000

20

685.89

0.7

DT Zone

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

0.29

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

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

a.

Idiff> in amps = 0.1*FLC

b.

m=

E.

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

1.0

BASIC DATA

a. b.

300 1.005

(fixed slope)

System voltage in kV

0.415

kV

Selected CT Ratio =

600/1

A

Consultant : SATCON

Page 6 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J c.

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

d.

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

e.

Relay used

f.

Setting ranges :

600

Ie>

0.01 - 1.0 In

TMS =

0.025 - 1.2

SETTING VALUES

2.1

Proposed Ie> (IDMT) setting for E/F (51G), Curve used for Ie>1 (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}]

IEC SI

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

A (Based on ETAP fault calculation) A

MICOM P111

2.0 a

36950

(Inverse time)

Standard inverse

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M)

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

I = MxIs

M

MVA

sec

6600

20

75.45

0.23

4950

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

ZONE OF OPERATION

1650

5

18.86

0.43

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

1.48

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

a.

System voltage in kV

Consultant : SATCON

6.6

kV

Page 7 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J b.

Selected CT Ratio =

1500/1

A

c.

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

600

A

d.

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

1500

A

e.

Relay used

f.

Setting ranges :

MICOM P132

Ie>

0.01 - 4.0 In

(Inverse 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),

a.

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

b.

Plug setting (PS) proposed =

IEC SI 0.09

c.

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

135

d.

Proposed TMS setting =

0.1

2.2

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

a.

Minimum Isc setting proposed in multiples M of In

0.15

b.

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

225

c.

Proposed DT time in sec =

0.4

2.3

Standard inverse

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

M

MVA

sec

30000

20

342.95

0.4

DT Zone

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

675

5

7.72

0.43

IDMT Zone

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

Consultant : SATCON

Page 8 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 176

1.3

2.01

2.66

162 149

1.2

1.85

3.83

1.1

1.70

7.34

G.

6.6kV TRANSFORMER FEEDER FOR LTPCC

1.0

BASIC DATA

a.

System voltage in kV

6.6

b.

Selected CT Ratio =

250/1

A

c.

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

600

A

d.

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

250

A

e.

Relay used

f.

Setting ranges :

MICOM P122

Ie>

0.1 - 1.0 In

Ie>>

0.1 - 8 In

@ 0.005 In (Inverse time) @ 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),

a.

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

b.

Plug setting (PS) proposed =

0.1

c.

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

25

d.

Proposed TMS setting =

IEC SI

Standard inverse

0.075

2.2

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

a.

Minimum Isc setting proposed in multiples M of In

0.2

b.

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

50

c.

Proposed DT time in sec =

0.1

2.3

kV

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs

EQUIVALENT MVA

TIME OF OPERATIOM (sec)

ZONE OF OPERATION

M

MVA

sec

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

Consultant : SATCON

IDMT Zone

Page 9 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J

H.

125

5

1.43

0.32

100

4

1.14

0.37

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

1.56

33

1.3

0.37

2.00

30

1.2

0.34

2.87

28

1.1

0.31

5.50

(Ie>)

415V INCOMER AND BUS COUPLER

1.0

BASIC DATA

a.

System voltage in kV

0.415

kV

b.

Selected CT Ratio =

3000/5

A

c.

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

36950

A (Based on ETAP fault calculation)

d.

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

3000

A

e.

Relay used

f.

Setting ranges :

SPAJ 140C

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

2.0

SETTING VALUES

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}]

b.

Plug setting (PS) proposed =

IEC SI

Standard inverse

0.1

c.

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

d.

Proposed TMS setting =

2.2

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

a.

Minimum Isc setting proposed in multiples M of In

0.12

b.

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

360

c.

Proposed DT time in sec =

0.7

2.3

sec

300 0.525

Time of Operation for Different Fault Current CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M) I = MxIs M

60000

Consultant : SATCON

20

EQUIVALENT MVA MVA

43.13

TIME OF OPERATIOM (sec) sec

0.7

ZONE OF OPERATION DT Zone

Page 10 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J 360

0.12

0.26

0.7

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

1800

6

1.29

2.01

IDMT Zone (Ie>)

1500

5

1.08

2.25

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

6.89

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

a.

System voltage in kV

(Ie>>)

0.415

kV

b.

Selected CT Ratio =

500/5

A

c.

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

36950

A (Based on ETAP fault calculation)

d.

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

e.

Relay used

f.

Setting ranges :

500

CDG 11

Ie>

0.2 - 0.8 In

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}]

b

Plug setting (PS) proposed =

IEC SI

(3 sec version)

(Inverse time)

Standard inverse

0.6

c

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

300

d

Proposed TMS setting =

0.75

2.2

A

Time of Operation for Different Fault Current

Consultant : SATCON

Page 11 of 12

SAIL, ISP Package-22 Relay Setting Calculation & Charts Settings of Various Earth Fault Relays for LBDS-9 Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J CURRENT IN MULTIPLES OF AMPS (I) SET CURRENT (M)

EQUIVALENT MVA

TIME OF OPERATIOM (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

ZONE OF OPERATION

2100

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 (Ie>)

900

3

0.65

4.73

600

2

0.43

7.52

570

1.9

0.41

8.13

540

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

55.03

Consultant : SATCON

Page 12 of 12

EARTH FAULT PROTECTION COORDINATION CURVES FOR 415V

SLG Fault Current = 36950A

100

TIME IN SEC

10

1

0.1 0.10

1.00 415V Incomer

Consultant : SATCON

MVA Back Up 51G

10.00 SLGF fault Current 36950A

100.00

EARTH FAULT PROTECTION COORDINATION CURVES FOR 6.6KV

TIME IN SEC

600A SLG

10

1

0.1 0.10

1.00 6.6kV TRAFO FDR

Consultant : SATCON

10.00 6.6KV BUS COUPLER

6.6KV INCOMER

MVA

100.00

51G at 6.6kV NEUTRAL

1000.00 600A SLG FAULT

EARTH FAULT PROTECTION COORDINATION CURVES FOR 33KV

100

TIME IN SEC

400A SLG Fault Current

10

1

0.1 1.00

10.00 33kV TRAFO FDR

Consultant : SATCON

MVA 33KV BUS COUPLER

100.00 400A SLG FAULT

1000.00 33KV INCOMER

Project:

ETAP

ISP MODERNISATION

7.0.0C

Page:

1

Location:

BURNPUR

Date:

07-08-2011

Contract:

AREVA

SN:

SATCON2007

Engineer:

SATCON

Revision:

Base

Filename:

LBDS9LT

Config.:

Normal

Study Case: SC

SHORT CIRCUIT CALCULATION AT LT BUS

Short-Circuit Summary Report 3-Phase, LG, LL, LLG Fault Currents Bus ID LV SWBD

3-Phase Fault kV 0.433

I"k 33.007

Line-to-Ground Fault

ip 79.775

Ik 33.007

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.

I"k 36.954

ip 89.314

Ib 36.954

Line-to-Line Fault Ik 36.954

I"k 28.585

ip 69.087

Ib 28.585

*Line-to-Line-to-Ground Ik 28.585

I"k 35.685

ip 86.248

Ib 35.685

Ik 35.685

Project:

ETAP

ISP MODERNISATION

7.0.0C

Page:

2

Location:

BURNPUR

Date:

07-08-2011

Contract:

AREVA

SN:

SATCON2007

Engineer:

SATCON

Revision:

Base

Filename:

LBDS9LT

Config.:

Normal

Study Case: SC

SHORT CIRCUIT CALCULATION AT LT BUS

Sequence Impedance Summary Report Bus ID LV SWBD

Positive Seq. Imp. (ohm) kV 0.433

Negative Seq. Imp. (ohm)

Zero Seq. Imp. (ohm)

Fault Zf (ohm)

Resistance

Reactance

Impedance

Resistance

Reactance

Impedance

Resistance

Reactance

Impedance

Resistance

Reactance

Impedance

0.00093

0.00790

0.00795

0.00093

0.00790

0.00795

0.00075

0.00535

0.00541

0.00000

0.00000

0.00000

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

6.6KV BUS 129 MVAsc

MV SWBD 6.6 kV

2.17 kV 8 2 5.

T1 1.6 MVA 6.6/0.433 kV 6.25 %Z

DS

LV SWBD 0.433 kV

page 1

33.01 33.0

kA

LV LOAD 1.2 MVA 10:37:45

Aug 07, 2011

Project File: LBDS9LT

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

6.6KV BUS 129 MVAsc

MV SWBD 6.6 kV kV 1 8 3.

T1 1.6 MVA 6.6/0.433 kV 6.25 %Z

DS

LV SWBD 0.433 kV

page 1

kV 3 2 0.

36.95 36.9

5 kA

LV LOAD 1.2 MVA 10:38:58

Aug 07, 2011

Project File: LBDS9LT