What is the difference between isolators and electrical circuit breakers?

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We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?

1 Answers  

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On which side, taps are provided in tap changing transformers and why?

2 Answers  

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What is Lockout Relay and what is use of it in electrical installation

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How many kinds of E.L.C.B and how to work E.L.C.B

0 Answers   Accenture,

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power formula

1 Answers  

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what types of fault occurred in transmission line ? which protection function senses the fault?

1 Answers  

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Please tell me ceilingfan sweep means. Commenly we used sweep1200mm and 600mm MMENLY WE USED CEILINGFAN SWEEP1200MM AND SWEEP600MM

1 Answers  

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what is sevice settings for mccb?How can be it setted?

0 Answers   Bhel, Minda,

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What is the function of Governor in Hydro Power Station? What is the Function of Lightning Arrestor Voltage Transformer (LAVT)?

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Why? We r used 50sq. mm. And above size cable in 3.5 core and below size are used in 4core

2 Answers  

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why a three phase transformer cant rotate like three phase motor

7 Answers  

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