Answer / k.prakashchandra

If it is new and under test ,CT might have been provided on
neutral instead of phase.If not , mostly due to pole
discrimination ( all poles not closing simultaneously ).
Disable instant element while closing .

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WAHAT IS ELECTRICITY

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A powerplant has 8 gensets operating in grid parallel mode. In one genset sometimes there is pf variation and kvar variation. The plant operates in pf mode. When this variation is onbserved the load is stable, voltage is also stable, freq and genset speed is also stable. How will you check the functioning of pf card. What shall be the ideal output vdc of the pfc, from there it is input to AVR?

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difference between diode and scr?

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For a Potential Transformer(PT), the primary neutral terminal must be grounded before energization. Why....? What will be heppend if we energize the PT without grounded the primary neutral point? Why..........?

2 Answers  

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