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Differential Protection of Alternators or Merz-Price circulating current protection
Differential protection or Mertz Price circulating current is mainly employed for the alternator stator winding protection against earth faults and phase-to-phase faults by use of circulating current principle. It function on the concept of...
Buchholz Relay
The Buchholz relay is a safety device which protects the transformer from internal incipient faults(slow developing faults such as insulation failure of winding, core heating, fall of oil level due to leaky joints etc..). It is...
Distance /Impedance relay
Relay Operation is governed by the ratio of applied voltage to current in the protected circuit. ie,the relay operates depending upon the impedance between the point of fault and the point where relay is...
Induction Type Directional Over current Relay:
In order to make directional over current relay to operate to a fault flowing in a specified direction, directional element is added to non directional relay.Directional Overcurrent Relay which is designed to be almost...
Induction type non-directional over current relay
This Induction Type Overcurrent Relay works on the induction principle and initiates corrective measures when current in the circuit exceeds the predetermined value. The actuating source is a current in the circuit supplied to...
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