Current Limiting Reactors in Power System
Current Limiting Reactors are connected in series with the power system essentially to damp the short circuit fault current. During normal operation, a continuous current flows through the reactor. Current…
Circuit Breaker Interview Questions & Answers
What is a Circuit Breaker? Circuit Breaker is a mechanical device designed to close or open contact members, thus closing or opening an electrical circuit under the normal or abnormal…
Advantages & Disadvantages of Oil Circuit Breakers
Oil circuit breakers are the oldest type of circuit breakers. The separating contacts of the oil circuit breakers are made to separate within the insulating oil which has better insulating…
Ungrounded or Isolated Neutral System Disadvantages
There will be no flow in the zero sequence currents In ungrounded or isolated neutral system there will be little interference with the communication lines because of the absence of…
Advantages & Disadvantages of AC and DC Power Transmission
AC and DC modes of transmission and distribution of power has both advantages and disadvantages:Â DC requires only two conductors for transmission and it is possible to transmit the power…
Advantages of Suspension Insulators and Pin type Insulators
With increase in the operating voltage the insulation requirement will also increases. Transmission system will have transmission voltages as high as 400kV and above voltage levels. At these voltages the…
Functions of Instrument Transformers (CTs and PTs)
AC type protective relays are actuated by the current and voltage supplied by the current and potential (voltage) transformers which are generally classified as instrument transformers. Generally instrument transformers are…
Advantages & Disadvantages of Synchronous Motors
In industries induction motors are employed mostly because of less cost, rugged construction, good starting torques and very less maintenance. Synchronous motors are rarely used in industries for drive applications.…
Advantages & Disadvantages Electromagnetic Relays
In Electromagnetic relays operating current flows through the coil. When this operating current increases, coil energizes the electromagnet. When the operating current becomes large, the magnetic field produced by electromagnet…
Neutral Grounding Practice in Power System
Generally on neutral grounding is provided at each voltage. There will be several voltage levels between the generation of the power and distribution of the power in the power system.…
