Answer / loboreliance2003

The relay comprises an attracted armature element fed via a
rectifier and series resistor. It can be provided with
either a fixed
setting, or variable settings using a plug bridge. It has a
minimum
withstand of rated voltage continuously.
Operation of Neutral Voltage Displacement Relays
The zero sequence current that flows for an earth-fault on
an un-earthed network is determined by the capacitance of
the cable to earth. This flow of current leads to a rise in
the voltage of the neutral point of the incoming supply
(the star-point of either the generator or transformer). It
is this rise that is detected by a neutral voltage
displacement relay. If the network is quite small (i.e.
short cables), then the zero-sequence voltage will be
unstable. This is why an instantaneous relay is only
generally used to provide an alarm. In the event of a
fault, neutral voltage protection cannot detect the
location of a fault, so all sources of supply should be
disconnected.

HOW TO WRITE A QUENTION ANSWER? I MEAN SHORT OR LENGHTHY ? OR FROM THE BOOK AS BOOK..... SOME TIME WE GIVE A ANS FROM THE BOOK AS LIKE BOOK ND WE GET MINIMUM 60% MARKS OR MORE THEN....... THEN HOW TO FILL THE Q-PAPER?

0 Answers  

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sir, Is their any measuring unit of knoking? please explian?

0 Answers   Kirloskar,

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What do you mean by a current transformer?

0 Answers  

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If the capacitor bank is installed in switchyard say 132/22kv then on LT side say 22kv/0.433kv is it necessary to install capacitor bank for maintaining power factor. if pf is maintained on HT side then will that be maintained on LT side as well.if not then how&why??????/ please explain...........

3 Answers   MacLellan,

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how the earthing point or earthing is taken for ships and airplanes?

1 Answers  

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what is the ambient temperature of transformer oil & winding?

2 Answers   Reddy Labs,

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What is the basic difference among IPS,UPS,EPS?

2 Answers   ABB, Navana,

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What type of tranformer generaly at soft wares like capacity 2000 kva 1800 kva etc iam confused it CT or PT OR distribution tranformer

3 Answers  

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why the earth pin is thicker than other pins in a plug? If it is for reducing resistance, then why the copper earth wire is not so thick as earth pin of socket?

5 Answers   Omax,

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what are the types of transformers

59 Answers  

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RESISTONS R1 AND R2 in parallel = Total R.? 1-R=R1+R2 2-R=1/R1 + 1/R2 3-1/R + R1+R2 R=R1R2/R1+R2 select one

2 Answers   BSNL, PGVCL Paschim Gujarat Vij Company Limited, TCS, Wartsila,

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current transformer cannot measure voltage or not ? then y we use P.T ?

1 Answers   Bhel,

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