I did oil BDV test of 1600 KVA trafo 20KV/400V as per IEC 156. Result is 1) 58 KV 2) 58 KV 3)40 KV 4) 50 KV 5) 58 KV 6) 18 KV. Avr is 47 KV. Can we say oil is still ok even in the 6th test BDV is 18 KV ?

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how generator avr give to the input?

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meter ratio is 100/5 CT ratio is 125/5, when the ratios changes i.e., CT ratio is 125/5 meter ratio is 100/5 what is the MF in boths conditions?

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why power of fm is weaker than am?

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What will be the sampling frequency that reveals the same sampled signal?

1 Answers   CCP,

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Q) Write VBscript code along with QTPscript code in QTP tool for below scenario 1. Launch yahoo site(i know) 2. Do loogin(i know) 3.Click inbox link(i know) 4.Go to every page of mail box and count no.of read mails and no.of unread mails(i know) 5.Store page numbers, read mail count and unread mail count in a new excel file sheet 6.Create 10 types of graphs on that data 7.Do logout and close site(i know) 8.Save new excel files with graph

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what is principle in relay testing kit?

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If you don’t have coal, salt and copper, then how would you earth your connection temporarily at a campus site?

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Does outdoor isolator loose connection cause short circuit current in that circuit? if yes then how ??

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How do you select a cable size(Cu & Al) for a particular load?

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What is size 00, 01, 1 etc., in HRC fuse types?

0 Answers   Jaypee,

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what will happen if there is a voltage leakage or current leakage in an electrical train

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