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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Duty cycle of Circuit Breaker
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What is the Duty Cycle/Operating Sequence of Circuit Breaker specified on the Name Plate

ByPranali N

[We keep wondering what the heck this sequence on the name plate of the Circuit Breakaer. Lets find it out now. What is the Duty Cycle/ Operating Sequence of CB? It is the Mechanical Duty requirement to be fulfilled by the  Operating Mechanism of the Breaker and specified on the Name Plate of the Breaker…

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Buchholz Relay in Transformer

ByPranali N

Bucholz Relay provides Mechanical Protection for Transformer. What is a Buchholz Relay? What is the Working Principle of Buchholz Relay? 1.Accumulation Of Gases: Whenever a fault occurs inside the transformer, such as Arcing, Partial Discharge, Insulation failure of turns, breakdown of core or excess core heating, the fault is accompanied by production of excess heat….

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…