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...
Category: Utilization of power
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...
PROTECTIVE RELAYS
A protective relay is a device that detects the fault and initiates the operation of the circuit breaker to isolate the defective element from the rest of the system. The relay detects the abnormal...
Vacuum Circuit Breaker (VCB) & Sulphur Hexaflouride Circuit Breaker
Vacuum Circuit Breaker (VCB): Vacuum used as an arc quenching medium. The operation of switching on and closing of current carrying contacts and interrelated arc interruption takes place in a vacuum chamber in the...
Oil Circuit Breaker & Air Blast Circuit Breaker
Oil Ciruit Breaker: Insulating oil like Transformer oil is used as arc quenching medium. Transformer oil has very good dielectric strength ie, 110kV/cm. In oil circuit breaker the contacts of the breaker are made...
Fuses & Circuit Breakers
FUSES A fuse is a safety device, used for the purpose of protecting a circuit against excess current (overload/short circuit condition).It is a short piece of metal inserted in series with the circuit, which...
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