Fanox - Model SIL-D - OC&EF Directional Protection Relays - Brochure

SIL-D relay is designed to protect MV systems with isolated neutral. In switchgears with isolated neutral, the earth fault calculation cannot be done as an exact value due to it is not dependent from the short circuit power. It depends on the MV system capacitor it is connecting to. For this reason, the earth fault is related with the network voltage and with the features of the lines connected to the mentioned system.