Oil circuit breakers are the oldest type of circuit breakers. The separating contacts of the oil circuit breakers are made…
There will be no flow in the zero sequence currents In ungrounded or isolated neutral system there will be little…
AC and DC modes of transmission and distribution of power has both advantages and disadvantages: DC requires only two conductors…
With increase in the operating voltage the insulation requirement will also increases. Transmission system will have transmission voltages as high…
AC type protective relays are actuated by the current and voltage supplied by the current and potential (voltage) transformers which…
In industries induction motors are employed mostly because of less cost, rugged construction, good starting torques and very less maintenance.…
In Electromagnetic relays operating current flows through the coil. When this operating current increases, coil energizes the electromagnet. When the…
Generally on neutral grounding is provided at each voltage. There will be several voltage levels between the generation of the…
Normal loads on ac supply system are inductive in nature (eg: motors, power transformers, voltage regulators, induction furnace, choke coils,…
Crowbar circuit is used to protect circuit or equipment under fault condition Over Current Causes: Over current flow through thyristors…
