what are different type of triping equipmen like MCB,MCCB and their differences

3 Answers   ABB, Schneider, UPPCL,

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IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?

2 Answers  

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For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.

3 Answers  

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1.protection used in transformer ? 2.Why breather called breather ? 3.Working of conservator tank.? 4.Speaker of parliament ?

4 Answers   Power Grid,

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How to calculate the Efficiency of Chiller

0 Answers   Knight Frank, L&T,

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How can we calculate the rating of a cable with formula?

2 Answers   TATA,

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In a transformer ,when voltage decreases current increases. but this is a violation of oms law.why?

15 Answers  

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can u describe the method used for protection of transmission line.

0 Answers   IBM,

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What is the difference between Earthing & grounding

4 Answers  

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What is the difference between ground and neutral ?

2 Answers   TCS,

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what is the function of RVT

4 Answers   RMSI,

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I have 380.KVA Volva Penta DG set. Tell me how to calculate units from KWH reading....

3 Answers  

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