Electro Mechanical Over Current Relay

An IDMT Electromechanical relay is an Induction type over current relay consists essentially of a Watt hour meter construction with slight modification to give required characteristics. The relay has two electromagnets. Upper electromagnet has two windings, one of which is primary and is connected to the secondary of a C.T in the line to be protected and is tapped at intervals. Tapping are connected to a plug setting bridge by which the number of turns in use can be adjusted and thereby giving the desired current setting. The plug-bridge is usually arranged to give several sections of tapping so as to give over current range from 50% to 200% in steps of 25%. Adjustment of current setting is made by inserting a pin between the springs loading jaw of the bridge socket at the tap value required.
When the pin is withdrawn from the purpose of changing the setting value while the relay in service, the relay automatically adopts higher setting, thus the CT’s secondary is not made to open. The secondary winding is energized by induction from the primary on the lower magnet.

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