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TRANSMISSION LINE ARRESTER

TRANSMISSION LINE ARRESTER

Transmission line arresters are designed with or without series gap. From the reliability view point, non gapped configuration with disconnecting device is preferred. Besides, usage of the transmission line arresters allows to reduce the insulation level (BIL) of the substation equipments, e.g. power transformers, as the lightning surges are suppressed in the line itself by the line arresters. Hence, the no. of surges experienced by the substation arresters would be reduced and hence the reliability of the entire system would be enhanced.

Technical Particulars Type Test Report

72kV DESIGN B, SL

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	Transmission Line Arrester
Description	72kV 10kA SL (TLA)
Model	PBC
Highest system voltage kV rms	72.5
Nominal system voltage kVrms	66
U_r - Rated voltage kVrms	72
Uc -MCOV(kVrms)	57
I_n - NDC (8/20μs) kA	10
Arrester classification	Station Low duty
Qrs(IEC 99-4 Ed.3) in coulomb	1
Wth (IEC 99-4 Ed.3) in kJ/kV	4
Qth (IEC 99-4 Ed.3) in coulomb
Max RDV kVp
a)5kA	180
b)10kA	192
c)20kA	204
Max. Switch. Imp. R.V.(kVp)
a)500A
b)1000A
c) 2000A
Max. Steep Current impulse RDV(kVp) at NDC	204
High current impulse withstand value (4/10 µs) kA	100
TOV (kVp)
i. 0.1	127
ii.1.0Sec	122
iii. 10.0Sec	117
iv. 100.0Sec	111
Short circuit current kA	40
Insulation Withstand
b)Power frequency kVrms	As per IEC 60099-4 2014
c)Switching Imp (Wet)(kVp)	NA
Rated frequency (Hz)	48 to 62
Leakage current
a.IR at MCOV in µA	Less than 400
b. IC at MCOV in mA	About 1.2
Reference voltage in Volt at Reference current in mA	> 72kV at 2mA
Partial discharge P.D	10pC
Creepage distance-mm (min) Phase to Phase	25mm/kV /31mm/kV (as applicable)
Max. Cantilever strength of arrester Kgf	150

108kV DESIGN B, SL

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	Transmission Line Arrester
Description	108kV 10kA SL (TLA)
Model	PBC
Highest system voltage kV rms	145
Nominal system voltage kVrms	110
U_r - Rated voltage kVrms	108
Uc -MCOV(kVrms)	86.4
I_n - NDC (8/20μs) kA	10
Arrester classification	Station Low duty
Qrs(IEC 99-4 Ed.3) in coulomb	1
Wth (IEC 99-4 Ed.3) in kJ/kV	4
Qth (IEC 99-4 Ed.3) in coulomb
Max RDV kVp
a)5kA	270
b)10kA	288
c)20kA	306
Max. Switch. Imp. R.V.(kVp)
a)500A	230
b)1000A
c) 2000A
Max. Steep Current impulse RDV(kVp) at NDC	306
High current impulse withstand value (4/10 µs) kA	100
TOV (kVp)
i. 0.1	190
ii.1.0Sec	183
iii. 10.0Sec	175
iv. 100.0Sec	167
Short circuit current kA	40
Insulation Withstand
b)Power frequency kVrms	As per IEC 60099-4 2014
c)Switching Imp (Wet)(kVp)	NA
Rated frequency (Hz)	48 to 62
Leakage current
a.IR at MCOV in µA	Less than 400
b. IC at MCOV in mA	About 1.2
Reference voltage in Volt at Reference current in mA	> 108kV at 2mA
Partial discharge P.D	10pC
Creepage distance-mm (min) Phase to Phase	25mm/kV /31mm/kV (as applicable)
Max. Cantilever strength of arrester Kgf	150

141kV DESIGN B, SL

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	Transmission Line Arrester
Description	141kV 10kA SL (TLA)
Model	PBC
Highest system voltage kV rms	145
Nominal system voltage kVrms	132
U_r - Rated voltage kVrms	141
Uc -MCOV(kVrms)	113
I_n - NDC (8/20μs) kA	10
Arrester classification	Station Low duty
Qrs(IEC 99-4 Ed.3) in coulomb	1
Wth (IEC 99-4 Ed.3) in kJ/kV	4
Qth (IEC 99-4 Ed.3) in coulomb
Max RDV kVp
a)5kA	350
b)10kA	375
c)20kA	400
Max. Switch. Imp. R.V.(kVp)
a)500A	300
b)1000A
c) 2000A
Max. Steep Current impulse RDV(kVp) at NDC	400
High current impulse withstand value (4/10 µs) kA	100
TOV (kVp)
i. 0.1	249
ii.1.0Sec	239
iii. 10.0Sec	229
iv. 100.0Sec	219
Short circuit current kA	40
Insulation Withstand
b)Power frequency kVrms	As per IEC 60099-4 2014
c)Switching Imp (Wet)(kVp)	NA
Rated frequency (Hz)	48 to 62
Leakage current
a.IR at MCOV in µA	Less than 400
b. IC at MCOV in mA	About 1.2
Reference voltage in Volt at Reference current in mA	> 141kV at 2mA
Partial discharge P.D	10pC
Creepage distance-mm (min) Phase to Phase	25mm/kV /31mm/kV (as applicable)
Max. Cantilever strength of arrester Kgf	150

228kV DESIGN B, SL

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	Transmission Line Arrester
Description	228kV 10kA SL (TLA)
Model	PBC
Highest system voltage kV rms	245
Nominal system voltage kVrms	220
U_r - Rated voltage kVrms	228
Uc -MCOV(kVrms)	182
I_n - NDC (8/20μs) kA	10
Arrester classification	Station Low duty
Qrs(IEC 99-4 Ed.3) in coulomb	1
Wth (IEC 99-4 Ed.3) in kJ/kV	4
Qth (IEC 99-4 Ed.3) in coulomb
Max RDV kVp
a)5kA	567
b)10kA	609
c)20kA	671
Max. Switch. Imp. R.V.(kVp)
a)500A	477
b)1000A
c) 2000A
Max. Steep Current impulse RDV(kVp) at NDC	654
High current impulse withstand value (4/10 µs) kA	100
TOV (kVp)
i. 0.1	402
ii.1.0Sec	386
iii. 10.0Sec	370
iv. 100.0Sec	354
Short circuit current kA	40
Insulation Withstand
b)Power frequency kVrms	As per IEC 60099-4 2014
c)Switching Imp (Wet)(kVp)	NA
Rated frequency (Hz)	48 to 62
Leakage current
a.IR at MCOV in µA	Less than 400
b. IC at MCOV in mA	About 1.2
Reference voltage in Volt at Reference current in mA	> 228kV at 2mA
Partial discharge P.D	10pC
Creepage distance-mm (min) Phase to Phase	25mm/kV /31mm/kV (as applicable)
Max. Cantilever strength of arrester Kgf	150

420kV DESIGN B, SL

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	Transmission Line Arrester
Description	420kV 10kA SL (TLA)
Model	PBC
Highest system voltage kV rms	420
Nominal system voltage kVrms	400
U_r - Rated voltage kVrms	420
Uc -MCOV(kVrms)	330
I_n - NDC (8/20μs) kA	10
Arrester classification	Station Low duty
Qrs(IEC 99-4 Ed.3) in coulomb	1
Wth (IEC 99-4 Ed.3) in kJ/kV	4
Qth (IEC 99-4 Ed.3) in coulomb
Max RDV kVp
a)5kA	1050
b)10kA	1120
c)20kA	1275
Max. Switch. Imp. R.V.(kVp)
a)500A
b)1000A
c) 2000A	900
Max. Steep Current impulse RDV(kVp) at NDC	1275
High current impulse withstand value (4/10 µs) kA	100
TOV (kVp)
i. 0.1	742
ii.1.0Sec	712
iii. 10.0Sec	682
iv. 100.0Sec	653
Short circuit current kA	40
Insulation Withstand
b)Power frequency kVrms	As per IEC 60099-4 2014
c)Switching Imp (Wet)(kVp)	NA
Rated frequency (Hz)	48 to 62
Leakage current
a.IR at MCOV in µA	Less than 400
b. IC at MCOV in mA	About 1.2
Reference voltage in Volt at Reference current in mA	> 420kV at 2mA
Partial discharge P.D	10pC
Creepage distance-mm (min) Phase to Phase	25mm/kV /31mm/kV (as applicable)
Max. Cantilever strength of arrester Kgf	150

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TRANSMISSION LINE ARRESTER

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