Electrical Engineering   SwitchGear & Protection


Topic Replies Activity
When is direct-on-line starting used for three-phase squirrel-cage motors? 1 January 19, 2018
How do built-in thermal overload protectors work? 1 January 19, 2018
How are built in thermal overload protector arranged? 1 January 19, 2018
What are the alternatives to the use of overload releases? 1 January 19, 2018
What special protection can be provided against single-phasing? 1 January 19, 2018
Will normal overload relays trip on single-phasing? 1 January 19, 2018
What happens when one of the three lines supplying a three-phase induction motor becomes open-circuited? 1 January 19, 2018
How many overload relays are required in the control gear? 1 January 19, 2018
How does the magnetic overload relay operate? 1 January 19, 2018
How thermal relays work? 1 January 19, 2018
What are the usual forms of overload relay in motor-control gear? 1 January 19, 2018
What provision must be made for short-circuit conditions in motor circuits? 1 January 19, 2018
What devices are required to give adequate protection to the motor? 1 January 19, 2018
What are the main functions of control gear? 1 January 19, 2018
For an Resistive Load and Inductive load considered for switching operation of circuit breaker, Switching of which load is difficult and Why? 1 January 19, 2018
What is re-striking voltage? 1 January 19, 2018
When does an arc extincts? 1 January 19, 2018
What is recovery voltage in circuit breaker? 1 January 19, 2018
Why asymmetrical breaking current is higher than the symmetrical breaking current in a circuit breaker? 1 January 19, 2018
Why Isolation switches are provided along with the circuit breakers? 1 January 19, 2018
What is meant by Current Chopping? 1 January 19, 2018
What are the some precautions must be taken when using a booster transformer? 1 January 19, 2018
Why excitation control is not possible beyond certain limits? 1 January 19, 2018
Why it is necessary to keep the receiving end voltage constant within specified limits? 1 January 19, 2018
What is a booster transformer? 1 January 19, 2018
Different methods of controlling voltage in an ac supply system? 1 January 19, 2018
How the Voltage Control in power system is achieved? 1 January 19, 2018
Purpose of Circuit Breakers 1 January 19, 2018
For EHV applications which type of circuit breaker is mostly preferred? 1 January 19, 2018
Why current chopping considered as serious drawback in a circuit breaker? 1 January 19, 2018