CT
15
ABB s. r. o., PPMV Brno Vídeňská 117 619 00 B R N O Czech Republic Document No.: 1VL 8413732 Page number: 1 Number of pages: 15 ABB MV SWITCHGEAR Erbil - Dohuk, Stage 5 KRG-MOE/EDS5- 08/2008 5 October 2011 Elaborated: Karel Keller rev.A 30.1.2012 Keller CT and VT Calculation
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CT
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ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 1
Number of pages: 15
ABB
MV SWITCHGEARErbil - Dohuk, Stage 5
KRG-MOE/EDS5- 08/2008
5 October 2011 Elaborated: Karel Kellerrev.A 30.1.2012 Keller
CT and VT Calculation
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 2
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 40.23 5P20Primary ratio IaN: 150 ASecondary ratio IbN: 5 ARated burden Sn: 7,5 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 0,4 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Outgoing/Capac.
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 10,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 28,323 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 4248 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:28,323 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 3
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 40.23 5P20Primary ratio IaN: 300 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 0,8 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Outgoing/Capac.
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 20,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 31,310 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 9393 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:31,310 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 4
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 46.43 5P20Primary ratio IaN: 1250 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 0,6 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Incomer feeder
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 15,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 34,568 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 43209 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:34,568 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 5
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 46.43 5P20Primary ratio IaN: 2500 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 1,2 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Incomer feeder
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 30,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 27,814 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 69536 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:27,814 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 6
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 40.23 5P20Primary ratio IaN: 300 ASecondary ratio IbN: 5 ARated burden Sn: 10 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 1 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Auxiliary transf.
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 25,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 25,587 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 7676 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:25,587 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 7
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 46.33 5P20Primary ratio IaN: 2500 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 1 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: Bus coupler
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 25,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 29,243 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 73107 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:29,243 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 8
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 46.43 5P20Primary ratio IaN: 1000 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 0,6 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: BC/Incomer
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 15,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 34,568 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 34568 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:34,568 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 9
Number of pages: 15
CT Overcurrent Protection
CT core parameters: TPU 46.43 5P20Primary ratio IaN: 2000 ASecondary ratio IbN: 5 ARated burden Sn: 15 VAAccuracy limit factor n: 20 -Current transformer resistance Rct: 1,2 Ω
Protection relay parameters:Relay type: REX 521Relay burden Sp: 0,5 VAHolmgreems conection of measuring S0: 0,5 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Real max. short circuit current I"kmax: 31,5 kA
Calculated values:
Feeder: BC/Incomer
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩInternal burden of CT: Sin=Rct*IbN
2 Sin= 30,000 VAReal burden: Sa=Sp+S0+Rl*IbN
2 Sa= 2,357 VAReal accuracy limit factor:nr=n*(Sin+Sn)/(Sin+Sa) nr= 27,814 -Maximum short circuit current without CT saturation:Imax=IaN*nr Imax= 55629 A
ConditionReal accuracy limit factor has to be higher than 20.
nr > n Result:27,814 > 20 OK
REX 521 requirements Overcurrent protection function.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 10 Number of pages: 15
CT Metering Units
CT core parameters: TPU 40.23 0.5Fs5Primary ratio IaN: 150-300 ASecondary ratio IbN: 5 ARated burden Sn: 15 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:Transducer Sineax I 538 0,025 VATransducer Sineax P 530 0,025 VATransducer Sineax Q 531 0,025 VA
Outgoing feederFeeder:
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩLead burden: Sa=Rl*IbN
2 Sa= 1,357 VASum other burden So= 0,175 VA
Total burden: St=Sa+So 1,532 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:15 > 1,532 OK
metering circuit.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 11 Number of pages: 15
CT Metering Units
CT core parameters: TPU 46.43 0.5Fs5Primary ratio IaN: 1250-2500 ASecondary ratio IbN: 5 ARated burden Sn: 15 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:Transducer Sineax I 538 0,025 VATransducer Sineax P 530 0,025 VATransducer Sineax Q 531 0,025 VAMultifunction meter 0,1 VA
Feeder: Incomer feeder
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩLead burden: Sa=Rl*IbN
2 Sa= 1,357 VASum other burden So= 0,175 VA
Total burden: St=Sa+So 1,532 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:15 > 1,532 OK
metering circuit.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 12 Number of pages: 15
CT Metering Units
CT core parameters: TPU 40.23 0.5Fs5Primary ratio IaN: 150 ASecondary ratio IbN: 5 ARated burden Sn: 15 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:Transducer Sineax I 538 0,025 VATransducer Sineax P 530 0,025 VA
Auxiliary transf.Feeder:
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩLead burden: Sa=Rl*IbN
2 Sa= 1,357 VASum other burden So= 0,175 VA
Total burden: St=Sa+So 1,532 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:15 > 1,532 OK
metering circuit.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 13 Number of pages: 15
CT Metering Units
CT core parameters: TPU 46.33 0.5Fs5Primary ratio IaN: 2500 ASecondary ratio IbN: 5 ARated burden Sn: 15 VA
Lead parameters: Lead lenght l: 5 mCross-section of lead S: 4 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:Transducer Sineax I 538 0,025 VAMultifunction meter 0,1 VA
Bus CouplerFeeder:
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,054 ΩLead burden: Sa=Rl*IbN
2 Sa= 1,357 VASum other burden So= 0,125 VA
Total burden: St=Sa+So 1,482 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:15 > 1,482 OK
metering circuit.Current transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 14 Number of pages: 15
VT Measuring winding
CT core parameters: TJP 4.0 0.5/3PPrimary ratio UaN: 11/√3 ASecondary ratio UbN: 0.11/√3 ARated burden Sn: 30 VA
Lead parameters: Lead lenght l: 10 mCross-section of lead S: 2,5 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:REX 521 0,5 VAVoltmeter Fb96 0,5 VATransducer Sineax U 539 0,006 VA
Calculated values:
Feeder: All feeders
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,087 ΩLead burden: Sa=Rl*Im
2 Im~150mA Sa= 0,002 VASum other burden So= 1,006 VA
Total burden: St=Sa+So 1,008 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:30 > 1,008 OK
metering circuit.Voltage transformers are sufficient for
ABB s. r. o., PPMV Brno Vídeňská 117619 00 B R N O Czech Republic
Document No.: 1VL 8413732Page number: 15 Number of pages: 15
VT Protection winding
CT core parameters: TJP 4.0 3PPrimary ratio UaN: 11/√3 ASecondary ratio UbN: 0.11/3 ARated burden Sn: 30 VA
Lead parameters: Lead lenght l: 10 mCross-section of lead S: 2,5 mm2
Cooper rezistance ρ: 0,0178571 Ω.mm2.m-1
Maximum allowable temperature Tmax: 75 °C
Other burden:REX 521 0,5 VA
Calculated values:
Feeder: All feeders
Calculated values:
Loop resistance: Rl=2*ρ*l/S*(1+α*(Tmax-20)) Rl= 0,087 ΩLead burden: Sa=Rl*Im
2 Im~150mA Sa= 0,002 VASum other burden So= 0,500 VA
Total burden: St=Sa+So 0,502 VA
ConditionRated burden has to be higher than total burden.
Sn > St Result:30 > 0,502 OK
protection circuit.Voltage transformers are sufficient for
