mintu sk


{ City } raghunathganj
< Country > india
* Profession * electrical engineer
User No # 115704
Total Questions Posted # 0
Total Answers Posted # 6

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Questions / { mintu sk }
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Answers / { mintu sk }

Question { 2168 }

why odd hormonics only will effect the power system.why
not even hormonics


Answer

In India standard frequency 50 .we are made all machine /device at this frequency.that's why no working properly either it's ok less or more. It's due to if frequency is high then more impedance will offer. on the other hand if it less then current will high in the system

Is This Answer Correct ?    0 Yes 0 No

Question { CESU, 2621 }

what are the standard values for resistances(Megger testing)
between L&N, L&E and N&E (L=Live,N=Neutral, E=Earth)?


Answer

20 mega ohms

Is This Answer Correct ?    0 Yes 0 No


Question { 14491 }

if we supply DC power to AC transformer then what its result?


Answer

We know that transformer coil is highly inductive and low resistive.so if we apply the dc voltage in primary coil then a heavy current flows to the coil .that causes a heating effect produce .by this heating transformer coil may burn .for this reason we do not apply dc on transformer coil .

Is This Answer Correct ?    0 Yes 0 No

Question { 6574 }

why the transmission side of the generating transformer is
always star??


Answer

For transmitting the power generating substation transformer should connect delta star for step up at high voltage also getting ground wire for reducing third harmonic current in transmission line.

Is This Answer Correct ?    0 Yes 0 No

Question { 6860 }

Why the power factor of the alternator in power plant is kept .8 lagging. Can't we maintain it at 1.


Answer

For transmitting power with low value of ferrenty effect .power generating station pf should kept 0.85 -0.80

Is This Answer Correct ?    0 Yes 0 No

Question { Reddy Labs, 9533 }

Difference between auxliary relay & pla relay


Answer

Auxiliary relay used for standby protection of electrical circuit when main relay fails to operate.
PLA relay used for feedback purpose.its work like a NO NC .

Is This Answer Correct ?    2 Yes 0 No