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...

I am going to appear RRB Sr. Section Engineer Exam, Electrical. Can you send me previous year questions of RRB Electrical engineer. specially Section Engineer questions. my email id is likerahulworld@gmail.com

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