Answer / abdelrahman fahmy

Air Circuit breaker
SF6
Vacuum
Air Blast
Oil immersed circuit breaker
the most common types are SF6 and Vacuum
Vacuum is compact size than the SF6

what is the similarity and difference between ups and inverter?

4 Answers   GMR,

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

1 Answers  

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State how to produce a constant rotating field by application of alternating currents to stator armature of a three-phase squirrel-cage induction motor

0 Answers   Jindal,

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hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?

0 Answers  

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give 5 differences between relay and contactor

1 Answers   Texas,

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Describe: Energy efficient motors

1 Answers   Reliance,

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there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

2 Answers  

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why two contacts(in series) are using in closing circuit

3 Answers  

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What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating

0 Answers  

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what is ps impedance test

0 Answers  

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sir vizag steel ka junior trainee ka paper kitne number ka ayega

0 Answers   Vizag Steel,

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There are different classes of protections in power plants.class a,b,c are clear..is there any class d and e r there..and elaborate class b protection.

0 Answers   GMR,

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