Sensitive earth Fault Relay

Application
It is possible for high resistance earth faults to remain undetected by traditional IDMT relays. For example on rural distribution systems, this can present a hazard to human life and livestock where for safety reasons. In these and other situations demanding extra sensitive earth fault protection, the SEFR relay, using solid state techniques, can be applied to detect earth fault currents down to 0.5% of the current. Primary current sensitivities down to low values of primary current are, therefore, possible, depending on the current transformer ratio, even when sharing current transformers with conventional IDMT electromechanical over current and earth fault relays.

Name:
Sensitive earth Fault Relay

Type:
HRSE13

Voltage rating
(Vn) 1A or 5A

Rated frequency
50 Hz

Third harmonic rejection
50Hz relay – better than 25:1

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