Answer / deepak thakur

2 percentage set in transformer diffrencial relay

Which material is used for the core of a transformer and why?

0 Answers  

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What kind of battries are generaly used with Disel Generator?

1 Answers   Exide,

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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we have one pumping station and 4.6 MW 7 no.s synchronous motors.so there is no required HT capacitor to improve power factor.But we have two no.s of 25 Mva power transformer connect to distribute the power for motors connect with 220 kv line.So i have required the HT capacitor to improve power factor at HT side i mean power transformer bus side.So please suggest how much HT capacitor banks required for same.

1 Answers  

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i have 90kw motor.so i choose connect cable .please what is parameter checked so please give to formula

0 Answers   May Baker,

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What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?

0 Answers  

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what is a lightning arrester???

12 Answers   ABB, NTPC,

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what is the response time of relays when a FAULT OCCURS IN A POWER SYSTEM?

2 Answers  

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What is maximum power transfer theorem?

0 Answers  

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Is current shock due to voltage or current? pls answer

2 Answers   ABB,

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Please elaborate th´evenin’s theorem?

0 Answers  

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FACP Means

1 Answers   RR,

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