Electromagnetic Attraction Relay - Working Principle and its types: Electromagnetic attraction relay operate by virtue of an armature being attracted to the poles of an electromagnet or a plunger being drawn into a solenoid. Such…
Protective Relay: 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 Protective Relay detect…
Types of Fuses: Fuse is the simplest current interrupting device for protection against excessive currents. Since the invention of first fuse by Edison, several improvements have been made and now-a-days, a variety of Types of…
Fuses Definition: Fuses Definition States that : A fuses is a short piece of metal, inserted in the circuit, which melts when excessive current flows through it and thus breaks the circuit. The fuse element…
Circuit Breaker Ratings: A Circuit Breaker Ratings may be called upon to operate under all conditions. However, major duties are imposed on the Circuit Breaker Ratings when there is a fault on the system in…
Resistance Switching Circuit Breaker: We already know that current chopping, capacitive current breaking etc. give rise to severe voltage oscillations. These excessive voltage surges during circuit interruption can be prevented by the use of shunt…
Switchgear Components in Circuit Breakers: The following are some important components common to Switchgear Components in Circuit Breakers : Bushings Circuit breaker contacts Instrument transformers Bus-bars and conductors 1. Bushings: When a high voltage conductor passes…
Principle of Vacuum Circuit Breaker: In the Principle of Vacuum Circuit Breaker, vacuum (degree of vacuum being in the range from 10-7 to 10-5 torr) is used as the arc quenching medium. Since vacuum offers the…
Sulphur Hexafluoride Circuit Breaker: In Sulphur Hexafluoride Circuit Breaker (SF6) gas is used as the arc quenching medium. The SF6 is an electro-negative gas and has a strong tendency to absorb free electrons. The contacts…
Air Blast Circuit Breaker Diagram: These breakers employ a high pressure air-blast as an arc quenching medium. The contacts are opened in a flow of air-blast established by the opening of blast valve. The Air…
