Self Balance Protection System of Generator: It necessarily consists of two cables connected to the two ends of each phase and the cables are passed through the circular aperture of…
Classification of Relays: The protective relay may be defined as an electrical device interposed between the main circuit and the circuit breaker in such a manner that any abnormality in…
Instrument Transformers - Definition, Types and Errors: AC type protective relays are actuated by current and voltage supplied by current and potential (or voltage) transformers, known as instrument transformers. The…
Electrical Braking of Polyphase Induction Motors: Electrical Braking of Polyphase Induction Motors which consists of different types, namely, Plugging (or Counter-Current Braking) Dynamic (or Rheostatic) Braking Regenerative Braking 1. Plugging…
Starting of Synchronous Motor and Precautions: As already stated the synchronous motor has got no self starting torque and the motor must first be brought up to synchronous speed by…
Starting of Electric Drives: The most important processes associated with controlled electric drives are (i) starting, (ii) speed control (iii) braking, (iv) reversal of direction of rotation. All these are…
Magnetic Contactor - Definition, Working Principle and Types: Magnetic Contactor is a electromagnetically operated switches that provide a safe and convenient means for repeatedly making and breaking branch circuits. The…
Magnetic Amplifier - Working Principle and Applications: In a magnetic amplifier, the basic component is a steel-cored coil with an additional winding energized by direct current. It is intended for…