Why we use auxillary relay ? what is function of differential relay, directional o/c relay?

0 Answers   Century Rayon, Mechanical,

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Generally In transformer Tap Changer on HT side, but I have seen in 66KV side in 220/66 KV, 100 MVA, Areva make transformer. Why ?

7 Answers  

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why some transformer without breather.

1 Answers   GTS,

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How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.

0 Answers  

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In what situations relays are used in Circuit breaker? In Above what rating of Circuit breaker the relays are used? Why relays are not used for CB like MCB?

0 Answers   Elektrotek,

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whu does the power factor of diesel generator always be 0.8. please explain

5 Answers   Dalkia,

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what is ramping rate of generator

0 Answers   Core,

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in ONAN type transformer winding temperature is lower than oil temperature at evening time but morning winding temp is higher than oil temp what is the reason?

2 Answers   Areva,

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we have earthmat at 110KV substation.we would like to take earth resistance.b some says that by connecting earth megger terminals (C1,P1) at middile point of earthmat (at riser) will cause voltage gradient at other earthmat nods and dont get exat earth resistance.when connecting at end nods will get exat value . is it correct .please explain

0 Answers   TNEB Tamil Nadu Electricity Board,

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what are the various types of earthing? plz give brief detail of all. also post pictures if u have.

22 Answers   Aster Teleservices, Era Infra Engineering, Micron Electricals,

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WHAT IS THE COOLANTS IN TRANSFORMER?

7 Answers   Bhel,

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Why the output of generator varies eventhough the shaft speed is constant in thermal power plant?

5 Answers  

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