7PG21 Solkor Rf Performance Specification
1 General
2 Characteristic Energising Quantity
Rated Current (In) 0.5A
1A
2A
5A
6.67A
Auxiliary DC Supply Not required for Solkor R/Rf, required for Pilot Supervision, intertripping
and guard only.
Rated Frequency (f
N
) Operating Range
50 Hz 47Hz to 52Hz
60Hz 57Hz to 62Hz
3 Application Limits
Number of Pilot cores required 2
Pilot Requirements
R Mode Rf Mode Rf mode with 15kv Transf.
Tap 1 Tap 0.5 Tap 0.25
Max. Loop Resistance 1000 Ω 2000 Ω 1780 Ω 880 Ω 440 Ω
Max. Inter core Capacitance 2.5μF 0.8 μF 1 μF 2 μF 4 μF
Pilot Current and Voltage
R Mode Rf Mode Rf mode with 15kv Transf.
Tap 1 Tap 0.5 Tap 0.25
Peak Voltage applied to pilots
under fault conditions
300v 450v 450v 330v 225v
Maximum current carried by pilots
under fault conditions
200mA 250mA 250mA 380mA 500mA
Maximum Primary Line Capacitive Charging Current:
Solidly Earthed System, 1/3 times the most sensitive earth fault setting
Resistance Earthed System, 1/9 times the most sensitive earth fault setting
4 Performance
4.1 Solkor R/Rf Relay
Insulation
Between pilot circuit and all other independent
circuits and earth
5kV rms
Between all external terminal and earth 2kV rms
Between terminals of independent circuits 2kV rms
Across normally open contacts 1kV rms
Isolation Transformer
Between pilot circuit terminals and all other terminals
and earth
15kV rms
Maximum through fault condition for stability 50x rated current
©2010 Siemens Protection Devices Limited Chapter 2 Page 3 of 5
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