Answer / ramesh kumar

Active elements store or supply energy like
capacitor,inductor, cell etc.

Answer / simon

Opposes rules of Kirchhoff,Ohms Law Eg-S.C.R,D.I.A.C,L.E.D,T.R.I.A.C.

we have a 2000kva step down transformer at our site. The HT side is charged from 22000V. So the primary current will be 52.48A. So why the HT breaker(SF6 ABB) is rated of 1250Amps ?

2 Answers  

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fuel-air ratio in a petrol engine fitted with suction carburettor,operating with dirty air filter as compared to clean filter will be

0 Answers   NIC,

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What should be the minimum depth of ground laid 66 kv ht cable?

3 Answers   L&T,

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wat's the procedure to take short circuit current for cable selection

0 Answers  

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Moving Iron instruments are applicable with a) DC only b) AC only c) DC & AC

14 Answers   Bhel, Engineers India, Engineers India Limited,

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how induction generator works?

3 Answers  

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In 400KV Switchyard, we have used Circuit Breaker With PIR, what is the significance of PIR & why they'r used?

2 Answers  

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Type of motor stater detail and working detail

0 Answers  

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What are the different towers used in 132kv transmission line? what are the differences between the P,R,S towers used in 132KV and detailed explanation

0 Answers  

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what is used root two in single phase line?

1 Answers   DVC,

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what type of motor are there in megger how they work.

2 Answers  

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One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

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