Answer / manoj tyagi

DRF=1-efficency

Answer / kumar.latif

it is the ratio of total voltage capacity of a scr string
to sum of capacities of individual scrs.

If V is total capacity and v is individual thyristor
capacity then derating factor=V/(nv) where n is the no of
thyristors

Answer / saroj kumar

String Efficiency=Actual Voltage or Current/n* Individual Voltage or current.

Derating Factor= 1- String Efficiency
=1-V/n*v

Answer / nhatanael

how to determine number of thyristors in series. in hvdc valve converter.
to determine derating factor you first need to know number of thyristors connected in series...

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could mail me the question papers for the test.

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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

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