Get ready for your power system interview with this comprehensive guide of top power system interview questions and sample answers. Master your interview preparation now!

Power Transformer

Answer: In Auto Transformer, there is only one winding, which works as Primary as well as secondary winding.

Answer: Transformer oil is used in power transformers for insulation and cooling purposes to maintain efficient operation and prevent overheating.

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TNC Switch Working, Application and Connection Diagram

ByPranali N

TNC Switch is used in the RP/CP (Remote TNC Switch) and in the Breaker (Local TNC Switch) for Tripping and Closing the Breaker Manually. What is a TNC Switch? It is a Three Position Switch, used for Closing or tripping the Breaker Manually from Control Panel/Relay Panel in the Control Room.  The Three Positions are…

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Transformer Insulation Explained !

ByPranali N

What are different types of Insulations used in Transformer? There  are two types of Insulations used in Transformers:  1) Oil  2) Solid Insulation What are the Functions of Transformer Oil ? Transformer Oil has mainly three Functions:   1) Insulation  2) Cooling 3) Also, there is contamination caused by Chemical Interactions with Windings and other…

Auto reclosing EHV Transmission Lines :  A Guide on Circuit Breaker Recloser

ByNitin N

Only 5% of the faults are of the Permanent nature, rest are transient faults and so auto reclosing EHV Transmission Lines has become a generally accepted practice in Power System. What is Auto-reclosing in EHV Lines ? Ans: Auto-reclose is automatically reclosing a Circuit Breaker in a set time after it has been opened due…

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Polarization index (PI) test on Insulators

ByPranali N

All Electric Insulations are dielectric in Nature and have a Capacitive Property. During application of Voltage across the Electrical Insulation, initially there will be a charging current After few instants, the Insulation becomes totally charged and the Capacitive Chrging Current becomes zero. Hence, it is recommended tp measure insulation resistance after 1 Minute from instant…