Restricted Earth Fault Relay Type

We are involved in manufacturing an supplying of Restricted Earth Fault Relay Type in Hosur, Tamil Nadu, India. The relay uses a type B61 attracted armature element energized via a low pass filter circuit and a full wave rectifier. The relay has a pre-set setting of 15V. Other resistors are introduced into the circuit to provide the voltage setting range up to 270V in increments of 5V using heavy duty DIL switches.

Included within the relays, are the essential non-linear resistors to limit the peak voltage output from saturated C.T.s, these resistors protect the C.T. insulation and secondary wiring.

Current Transformer Requirements:
Experience has shown that most protective C.T.s are suitable for use with the high impedance relays and where the C.T.s are specially designed for this protection, their overall size may be smaller than that required for an alternative current balance protection.