Answer / j.kesavan

Dar means dielectric absorption ratio test in HT
machines.HT megger reading 1minite/30second reading is Dar
test.

Answer / sam

DARThe is The ratio of a 60 s reading to a 30 s reading
this ratio of time-resistance readings can be used to
indicatethe condition of the insulation system.
DAR = Recsistance 60 sec / Resistance 30 sec
Goog Insulation DAR more than 1.25

what is AB switch???

6 Answers   NTPC, Simplex,

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I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

2 Answers  

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Motor and transformer working with same principle so why motor rotates while transformer not?

7 Answers  

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What is mean by staling?

2 Answers   UPPCL,

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we convert 66kv to 33 kv to 11kv to 440v. why can't we directly convert 33kv to 440 ?

9 Answers   EMC, Jakson, L&T,

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Where can I get CPWD electrical shedule rates in web? please help me.

1 Answers  

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Can we generate 3 phase power from single phase connections?? If yes, how?

2 Answers  

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Please mention available current rating for MCB,RCCB,MCCB in the market or any website

1 Answers   ETCO,

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transform oil how going to act like ainsulation purpose

1 Answers   Siemens,

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Why the stator is rotated in ceiling fans not Rator?

3 Answers  

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why energy storing capacity of magnetic field is much higher than electric field ?

1 Answers  

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my first school?

1 Answers  

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