Article 4.7.2O : Importance of iELR(Earth Leakage Relay) in Power system.
Earth Leakage Relays
Earth leakage relays play
two very important roles in electrical systems ‒ protection of human beings
from electrocution and safety from fire. Leakage current through very small in
magnitude can wreak havoc in the installations. 'Short Circuit' is commonly
attributed as the cause of electrical fires but actually, in the majority of
the cases, it is the leakage current which is the primary cause of electrical
fires. Earth leakage relays usually in conjunction with highly sensitive
toroid CTs (also known as CBCTs) perform the function of detecting these
leakage currents and tripping the circuits before any mishap takes place.