Answer / raj

IT IS NEUTRAL DISPLACEMENT RELAY AND IT IS USED FOR VARIOUS
PROTECTION BUT THE PRINCIPLE IS THAT IN CASE OF NO FAULT NO
VOLTAGE IN RELAY ( IT USED OPEN DELTA VOLTAGE FOR RELAY
INPUT ) AND IF FAULT OCCUR IN ANY PHASE THEN UNBALANCED
VOLTAGE WILL GET ACROSS OPEN DELTA FOR RELAY TO OPERATE.

Answer / k.prakashchandra

It could be non-directional relay which is cheaper than
directional relay and used wherever current is not expected
in both directions.

why ht motors are connected in star?

1 Answers  

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sir, iam a electrical engg graduate and i want to go in automation sector and for this i have decided to do industrial training for this,plz suggest me some good institute for the same in delhi,ncr. my degree percentage is 58%, can i get job after doing training, plz help....

0 Answers  

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Why the Voltage rises when Leading Power Factor is occurs?

2 Answers  

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What is electrical earthing?

1 Answers  

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how we are desining 63.5 ohm resistor for NGR of alternator?

1 Answers  

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HOW TO CALCULATE CAPACITOR BANK OR HARMONIC FILTER CALCULATION

0 Answers   ECCI, EFS,

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what happens in the short circuited secondary transformer,if the resistance of the short circuit is increased gradually?

0 Answers   IIT,

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What are the advantages and disadvantages of the dc motors?

0 Answers  

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If 440 V supply has given at the secondary winding of transformer at that time if we apply 11 KV at primery then what will happen???????

4 Answers  

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features of hbc fuses

0 Answers  

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i installed 100kva ups. what KVA genset they should provid in input side? plz any update formula or ans with reason.

0 Answers  

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what is relation of rpm with Power supply? rpm directly Proposational to power ?

2 Answers  

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