PT.
ABB SAKTI INDUSTRI
CALCULATION
Project :
GI 150kV PELANGGAN
PT. STAR AJIBARANG PURWOKERTO
Title :
CVT SIZING CALCULATION
Reference Drawing :
SLD START-EM-PRJ-001
Rev No Date Remarks Prepare Check Approve
PT. ABB SAKTI INDUSTRI GI 150kV PELANGGAN BUSBAR
PT. STAR AJIBARANG PURWOKERTO
CVT SIZING CALCULATION
SELECTION OF PARAMETER OF CAPACITIVE VOLTAGE TRANSFORMER FOR BUSBAR
Maxsimum cable route length CVT to relay panel located in switcyard control building 150 meters
Core 1
Purpose Metering
Rasio 150√3/0.1√3 kV
Primary Voltage Vpn 150000 V
Secodary Voltage Vsn 100 V
Accuracy Class 0,2
Burrden 50 VA
Conductor Cross-section 4 mm²
Conductor Material Copper
Number or runs Per phase 1
Conductor Unit Resisctance 4,61 Ω/km
lead Resistance at 20⁰C CF+CT Rc 5,61
Rc = xR
lead Resistance at 70⁰C CF+WT
Two way lead loop Resistance RL 7,753 VA
Instrument Connected & Their Burdens
Digital Metering 1 VA
Total Connected Burden to the CVT = Cable burden + Meter's Burden = 8,753 VA
Page : 1 of 2
PT. ABB SAKTI INDUSTRI GI 150kV PELANGGAN BUSBAR
PT. STAR AJIBARANG PURWOKERTO
Maxsimum cable route length CVT to relay panel located in switcyard control building 150 meters
Core 2
Purpose Spare
Rasio 150√3/0.1√3 kV
Primary Voltage Vpn 150000 V
Secodary Voltage Vsn 100 V
Accuracy Class 3P
Burrden 50 VA
Conductor Cross-section 4 mm²
Conductor Material Copper
Number or runs Per phase 1
Conductor Unit Resisctance 4,61 Ω/km
lead Resistance at 20⁰C CF+CT Rc 5,61 Ω
Rc = xR
lead Resistance at 70⁰C CF+WT
lead loop Resistance RL 7,753 VA
Instrument Connected & Their Burdens
Metering Relay Burden 1 VA
Total Connected Burden to the CVT = Cable burden + Meter's Burden = 8,753 VA
Page : 2 of 2
PT. ABB SAKTI INDUSTRI GI 150kV PELANGGAN BAY OVER HEAD LINE
PT. STAR AJIBARANG PURWOKERTO
CVT SIZING CALCULATION
SELECTION OF PARAMETER OF CAPACITIVE VOLTAGE TRANSFORMER FOR BAY OVER HEAD LINE
Maxsimum cable route length CVT to relay panel located in switcyard control building 150 meters
Core 1
Purpose Metering
Rasio 150√3/0.1√3 kV
Primary Voltage Vpn 150000 V
Secodary Voltage Vsn 100 V
Accuracy Class 0,2
Burrden 30 VA
Conductor Cross-section 4 mm²
Conductor Material Copper
Number or runs Per phase 1
Conductor Unit Resisctance 4,61 Ω/km
lead Resistance at 20⁰C CF+CT Rc 5,61 Ω
Rc = xR
lead Resistance at 70⁰C CF+WT
Two way lead loop Resistance Rl 7,753 VA
Instrument Connected & Their Burdens
Metering 1 VA
Total Connected Burden to the CVT = Cable burden + Meter's Burden = 8,753 VA
Page : 1 of 2
PT. ABB SAKTI INDUSTRI GI 150kV PELANGGAN BAY OVER HEAD LINE
PT. STAR AJIBARANG PURWOKERTO
Maxsimum cable route length CVT to relay panel located in switcyard control building 150 meters
Core 2
Purpose Line Differential
Rasio 150√3/0.1√3 kV
Primary Voltage Vpn 150000 V
Secodary Voltage Vsn 100 V
Accuracy Class 3P
Burrden 30 VA
Conductor Cross-section 4 mm²
Conductor Material Copper
Number or runs Per phase 1
Conductor Resisctance at 4,61 Ω/km
lead Resistance at 20⁰C CF+CT Rc 5,61
Rc = xR
lead Resistance at 70⁰C CF+WT
Two way lead loop Resistance Rl 7,753 VA
Instrument Connected & Their Burdens
RED 670 0,15 VA
Total Connected Burden to the CVT = Cable burden + Meter's Burden = 7,903 VA
Page : 2 of 2
PT. ABB SAKTI INDUSTRI GI 150kV PELANGGAN
PT. STAR AJIBARANG PURWOKERTO
CVT SIZING CALCULATION
SELECTION OF PARAMETER OF CAPACITIVE VOLTAGE TRANSFORMER FOR BUSBAR
Parameters of CVT Bay OHL
Calculated Total Burden
winding No. CVT Ratio Class Selected Burden(VA) Device
(VA)
1 (150√3)/(0.1√3)kV 0,2 30 8,753 Metering
2 (150√3)/(0.1√3)kV 3P 30 7,903 RED 670
Parameters of CVT Busbar
Calculated Total Burden
winding No. CVT Ratio Class Selected Burden(VA) Device
(VA)
1 (150√3)/(0.1√3)kV 0,2 50 8,75 Metering
2 (150√3)/(0.1√3)kV 3P 50 8,75 N/A
Page : 1 of 1
