Answer / subash

R-running winding
Y-common winding
B-bushing winding

why we use REF and Differential Protection in one transformers?my doubt is both protections are operated in internal fault only.why we want to use 2 protections?please clarify.

7 Answers  

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what is tha between elcb & rccb?

3 Answers   Essar,

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What is an isolation transformer?Why do we need isolate circuits?Where do we use them?

2 Answers  

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What is the clear distance between a MV panel(rear side) and wall.

3 Answers   L&T,

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Why is the frequency not changed during transformation of electrical energy in a transformer?

0 Answers  

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Two electronic energy meters are connected to seperate phase wires, but connected to a looped neutral. Are these going to function correctly?

8 Answers   DRDO,

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How Kneepoint voltage of CT practically related when CT in service. ie Knp is above 670 what exactly means

0 Answers   ABC,

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Control cables in S's will carry 1000v which is AC R DC? Pls answer me 

0 Answers  

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what is tan delta point in a current transformer?

2 Answers  

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For RCD (Residual current device) Icu is defined. How i can find Ics for them?

0 Answers  

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What is switching over voltage?

1 Answers   MEIL,

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what is rated current and operating current?

3 Answers  

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