k.prakashchandra


{ City } karkala
< Country > india
* Profession * rtd e.e.
User No # 54717
Total Questions Posted # 0
Total Answers Posted # 521

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 1313
Users Marked my Answers as Wrong # 525
Answers / { k.prakashchandra }

Question { 3827 }

Please give me a solid reason there are 2 ELCB's If we take
Phase from ELCB NO:1 an Netural from ELCB N:2 why ELCB is
tripping when we connect the Load?please brief me with detail


Answer

It is RCCB and not ELCB . You are creating imbalance by
removing one wire

Is This Answer Correct ?    3 Yes 0 No

Question { Cairn, 3350 }

Can any body describe me why a soft starter is used for 6.6kv
induction motor instead of VFD ?


Answer

VFD is employed generally for low and medium voltages

Is This Answer Correct ?    0 Yes 2 No


Question { Sree Rayalseema Green Energy Limited SRGEL, 4892 }

what is difference between earth and ground?/


Answer

Earthing means connecting to earth only . Grounding means
connecting to earth or to the body as in automobiles ,ships ..

Is This Answer Correct ?    3 Yes 3 No

Question { TCS, 6166 }

What is meant by sotf,lbb,power swing,pole discrepency,auto
reclose?


Answer

sotf = switch on to fault ,lbb = local bus bar backup , pole
discrepancy = in 3 phase individually operated circuit
breaker ,all the three poles should close simultaneously
,otherwise there will be pole discrepancy .i.e, time lag
while closing .

Is This Answer Correct ?    30 Yes 6 No

Question { 3103 }

what is DG A,B,C,D check?


Answer

They are periodical checks and the details are given in the
maintenance manual

Is This Answer Correct ?    3 Yes 0 No

Question { 2650 }

Can we use a window type neutral CT instead of a bar type
neutral CT.
We have an issue with a neutral bar type CT of 800/1 ratio
with a Circuit breaker NS800L shneider type, and we want to
change it with a window type.
Pls advise.
Thanks


Answer

If it is being used for REFR ,the new one should be
identical to the old in all respects , especially knee
point voltage

Is This Answer Correct ?    2 Yes 0 No

Question { KSEB, 4384 }

Can we connect two CT'S to one energymeter?


Answer

Yes ,in case of 3w 3 ph energy meter

Is This Answer Correct ?    7 Yes 0 No

Question { 2551 }

when secondary volts is given how do we find primary volts, turns, amps of primary and secondary given???


Answer

Nameplate

Is This Answer Correct ?    2 Yes 4 No

Question { 3930 }

what happen if i change the polarity of ac when it is
connected with motor


Answer

Ac does not have polarity , you can change the phase sequence

Is This Answer Correct ?    1 Yes 0 No

Question { GE, 3735 }

In power plants the reading changes abruptly to give value
(MW -25) (MVAR -15)
What are the reasons for this?
What is the solution?


Answer

Mostly due to grid voltage variation . Set the AVR at APfC

Is This Answer Correct ?    0 Yes 0 No

Question { 3865 }

what will happen if secondary of potential transformer
(220kv/110volt) of any metering core or protection core
(cables) of any phase got earthed??


Answer

As the secondary voltage is only 63.5 V wrt ground ,nothing
happens if the contact is with the dry earth . If there is
any dip in voltage or blowing out of fuse under other
conditions , energy meter may record less and the distance
relay may act in the protection scheme with directional
relay becoming non-directional

Is This Answer Correct ?    0 Yes 0 No

Question { Gedco, 3277 }

Hi to u all :
Friends:
Why when operate on 2 phase welding machine the power metr
goes reverse ??
the meter is god on other loads.
thanks


Answer

Very low pf on no load . The meter needs 'pf adjustment'

Is This Answer Correct ?    1 Yes 0 No

Question { Gedco, 3277 }

Hi to u all :
Friends:
Why when operate on 2 phase welding machine the power metr
goes reverse ??
the meter is god on other loads.
thanks


Answer

If two single phase meters are employed ,one of the meters
is likely to show negative reading ( import ) due to low pf
and the other meter positive ( export ).

Is This Answer Correct ?    2 Yes 0 No

Question { FWO, 3580 }

Hi frnds :)
plz tell me that i have 100 KVA 3 phase generator so by
thumb rule 100*1.4 = 144 amps
and generaly we can operate at 80% load...so it will 144*0.8
=112 amps....
so now i m confused about single phase load.....if we use
that generator only for single phase the that 112 amps is
total single phase load or i can give 112 amps at red 112
amps at yellow and 112 amps at blue....
i mean that total single phase load that 100 KVA generator
will take is 112+112+112=336 amp ??


Answer

Current in each phase 112 A ,ph voltage say 230 V. Then
apparent power in each phase is about 26 KVA .Sum = 78 KVA
which is almost the permissible load on the gen. If you add
phase currents ,the resultant is zero as they are vector
quantities . You can have a load of 112A in each phase .

Is This Answer Correct ?    0 Yes 3 No

Question { Ariel, 3701 }

My system is 22kv/3.3kv transformer. client is asking to use
NGR, but as we have dedicated Neutral Earthing systems which
has a value less than 1 Ohm. So i want solid comparision.
Why i should not use NGR as my system is already
protected.Can any one help me to get out of this.how should
i reply on basis of some great comparision and calculations.
Please help


Answer

NGR is provided to limit the earth fault current

Is This Answer Correct ?    1 Yes 0 No

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