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FAQ01545 of Measuring / Motor Protective Relays FAQ

FAQ No. FAQ01545

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Question

What devices can be used in combination with the K2GS-B Earth-fault Directional Relay?

Answer



ZCT (Zero-Phase Current Transformers): Select from the OTG-N Series (through type) or the OTG-D Series (separate type).

ZPD (Zero-phase Voltage Detection Unit): Select either a VOC-1MS2 (a split-type set with three VOC-1M units and one K3P-M) or a VOC-3S (integrated type).

VOC-1MS2 Zero-phase Voltage Detection Unit

Set model No.Peripheral devices
VOC-1MS2Zero-phase Voltage Detection Capacitor (VOC-1M)
Zero-phase Voltage Detection Capacitor Cap
Zero-phase Voltage Transformer (K3P-M)
Cable (1 m)

VOC-1M Ratings and Performance

Rated voltage6,600 VAC
Rated frequency50/60 Hz
Rated capacity250 pF
Insulation level6 A (JEC 1201)
Dielectric strength22,000 VAC for 1 min (between high-voltage terminal and mounting terminal)
2,000 VAC for 1 min (between low-voltage terminal and mounting terminal)
Insulation resistance1,000 MΩ min. (between high-voltage terminal and mounting terminal) at 1,000 VDC
Impulse withstand
voltage
1.2/50 μs, peak value: 65,000 V (between high-voltage terminal and mounting terminal)
Ambient operating
temperature
-20 to 60°C
Operation conditionIndoors (in air)
WeightApprox. 550 g (per Unit)

VOC-3S Zero-phase Voltage Detection Unit

VOC-3S Ratings and Performance

Rated voltage6,600 VAC
Rated frequency50/60 Hz
Output voltage7.6 VAC (when 6,600-VAC line is in complete ground fault condition)
IO phase angle180°±10°
Insulation level6 A (JEC 1201)
Dielectric strength22,000 VAC for 1 min (between each high-voltage terminal and case, and between
high-voltage terminals)
2,000 VAC for 1 min (between each high-voltage terminal and case)
Insulation resistance1,000 MΩ min. (between each high-voltage terminal and case, and between
high-voltage terminals) at 1,000 VDC
10 MΩ min. (between each high-voltage terminal and case) at 1,000 VDC
Impulse withstand
voltage
1.2/50 μs, peak value: 65,000 V (JEC 212)(between high-voltage terminal and case)
Ambient operating
temperature
-20 to 60°C
Operation conditionIndoors (in air)
WeightApprox. 6.2 kg (per Unit)

Note:Changing between 50-Hz operation and 60-Hz operation can be achieved through selective connections at output terminals.

Note:The following devices are also available if necessary.

OB Ground Fault Protector

A Ground Fault Protector is required for current compensation when an insulation transformer is used in power-receiving equipment, and the ground current on the power supply side (as viewed from the Zero-phase Voltage Transformer) is insufficient for the sensitivity of the relay.

OB Ratings and Performance

Model
Type
OB
For 3,300 VFor 6,600 V
Circuit voltage3,300 V6,600 V
Rated voltage3,300 /√36,600 /√3
Rated frequency50/60 Hz
Capacitance0.3 μF x 30.2 μF x 3
Compensation
current
50 Hz0.54 A0.72 A
60 HZ0.65 A0.86 A
Insulation level3 B6 B
Dielectric strength10,000 VAC for 1 min
30,000 VDC for 10 s
16,000 VAC for 1 min
45,000 VDC for 10 s
Operation conditionIndoors, outdoors (in air)
WeightApprox. 15 kg

AOF-1N Auxiliary Power Supply Unit

An Auxiliary Power Supply Unit is required when using the K2CA-DO Over Current Relay and K2GS-BT Earth-fault Directional Relay in combination, or when using the K2CA-HC Over Current Relay and K2GS-H Earth-fault Directional Relay in combination.

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