Answer / rohit

Core balance CT (CBCT): The CBCT, also known as a zero sequence CT, is used for earth leakage and earth fault protection. In the CBCT, the three core cable or three single cores of a three phase system pass through the inner diameter of the CT. When the system is fault free, no current flows in the secondary of the CBCT. When there is an earth fault, the residual current (zero phase sequence current) of the system flows through the secondary of the CBCT and this operates the relay. In order to design the CBCT, the inner diameter of the CT, the relay type, the relay setting and the primary operating current need to be furnished.

what is the working principle of contactor and conditions of normal open and normal close on it?

3 Answers   EEE,

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I have calculated load for an office building which is 1200 KW as all the load is single phase therefore its 1200 kw single phase. Now i have to design Transformer and Generator for this load Please kindly give me exact answer that how much capacity of Three Phase Transformer and Three Phase Generator is required for this load.

3 Answers  

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I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and pulse duration 0.125ms and feeding it to a transformer since i want the pulse to get amplified around 60V. At the output amplification s happening but the pulse is changed to a spike, can you tell me what could be the reason? (an ordinary transformer 220V-12V stepdown transformer is reverse connected ie. now it is 12V-220V stepup and voltage amplification happens)

0 Answers  

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I am an electrical contractor in noida, I am registereg in noida vat. i got a contract in Delhi State, my party told me that we shall deduct WCT @4% & reimburse Service tax all in composite scheme. Now Problem is this, 1 Can i able to purchase outside the delhi? 2 Can i produce a c form to our vendors? 3 What is limitation of purchase from outside the Delhi? 4 What % of tax Govt will levied upon me? 5 How can i take credit of tax paid upon purchase made by us. So, like these type questions i have in my mind if any person know the right answer please write to sksproj@gmail.com or contact me on - 8010076534 / 9212758177 / 9718378190. Thanks with Best Regards, S.K.Saxena

3 Answers  

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In 6600/√3/110/√3v voltage transformer,how much output voltage in open delta transformer,after removing 1-phase of primary side on transformer?

2 Answers  

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IN WHICH MODE THE TRANSFORMER WILL GET A MAXIMUM OUT PUT VOLTAGE. ASKED FOR POWER GRID EXAMINATION STAT-STAR,STAR-DELTA,DELTA-STAR,DELTA-DELTA

3 Answers  

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How can we do megger test of cable??

2 Answers  

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why put integration for capacitorand differation for inductance

1 Answers  

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what is threshold voltage for a relay???what does it exactly means ?whats its value in our indian transmission system say 11kv feeder RMU relay

3 Answers  

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how copper and aluminium wires or cables are choose for current rating? please provide copper and aluminium wire selection chart for different current rating ?

0 Answers  

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why the under of transformer platform is filled with rock stones.

10 Answers   TNEB Tamil Nadu Electricity Board,

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what is meant by AYFY Cable?

9 Answers   XLPE,

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