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 { 2812 }

how to calculate 3 phase clearance in Tower line , 33& 11 KV
Line and LT Line.


Answer

Just follow the I E Rules

Is This Answer Correct ?    0 Yes 0 No

Question { Gannon Dunkerley, 5474 }

our company have 750 kva oil transformer.still we have
facing a problem that is when voltage is 11.5 kv coming
from HT side then LT-side voltage is 420v or above at tape
1.please give me best solution to decrease the voltage


Answer

Both the voltages are 5 % higher than the normal voltages ,that means tap position is for normal primary voltage . Check the name plate details

Is This Answer Correct ?    0 Yes 0 No


Question { 3125 }

I have a question, I visit 01 site and face a problem,
there is 2.5 ton Air Con working, when air con compressor
is running at that time rectifier voltages are increasing
upto 290-295 v and rectifier is giving main high alarm
(rectifier is APC single phase, before starting compressor
rectifier voltages was 230v. when air con is going off
rectifier voltages are decreasing smoothly at its actual
voltages 230v.

Load on Genset phases is this: Red-13.5 amp AC (Air Con
load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp
AC (telecom system load),
Genset phase to phase and neutral to phase voltages are
also ok.


These are 10 sites having same system and same rectifier
APC brand at every site 02 genset are working but the
problem is same at all these 10 sites.

What will be the reason behind???


Answer

Neutral- shift due to load

Is This Answer Correct ?    0 Yes 0 No

Question { 1932 }

in my observation NCT is used at Karnataka power
transmission. why we are not used in andhra pradesh


Answer

NCT is required for REFR of tr

Is This Answer Correct ?    0 Yes 0 No

Question { NTPC, 3678 }


374kvar capacitor bank connected
across 600kw,6.6kv motor.what will
happen if motor run at 50% , whether
full kvar applied or half?


Answer

PF is better at full load . You may have to connect full KVAR at 50 % load

Is This Answer Correct ?    0 Yes 0 No

Question { 2748 }

Our Slip Ring Induction Motor Frequently tripped By Earth
Fault While Starting time and in Normal Operation Time also
Kindly Let me Know the Reason. Application Ball Mill -
Cement Mill


Answer

Check the brushes ,as tripping is probably due to unbalanced
current if 2 OCR and EFR protection is adopted

Is This Answer Correct ?    0 Yes 0 No

Question { Gujarat Alkalies and Chemicals GACL, 8731 }

What is the basic difference between AVR and stabilizer?


Answer

In stabilizer input voltage may be slightly different from the output voltage which is constant . In case of regulator, output voltage remains constant at a chosen value which can be varied at will.

Is This Answer Correct ?    2 Yes 1 No

Question { CG, 13167 }

what is difference Auto-transformer and ICT ?


Answer

To get the required voltage and current( ct) respectively

Is This Answer Correct ?    4 Yes 12 No

Question { Hindalco, 4282 }

Is LV shorted in magnettic balance test?If yes why?


Answer

To limit the short circuit current

Is This Answer Correct ?    1 Yes 0 No

Question { 4720 }

Why D.C Voltage used in Meggering...as well as in Hipot test?
why not A.C?


Answer

To maintain the potential difference continuously

Is This Answer Correct ?    1 Yes 0 No

Question { DLF, 6010 }

How much difference can there be between HT & LT KWH unit
consumption at the same load?


Answer

About 1.6 % at full load

Is This Answer Correct ?    2 Yes 0 No

Question { 4360 }

what is mean by potential and potential free contacts


Answer

Potential free means 'zero potential' ,not connected to any
power supply

Is This Answer Correct ?    1 Yes 0 No

Question { 2074 }

in ct secondary one terminal is connected to earth why?


Answer

To remove the induced voltage of primary due to capacitance

Is This Answer Correct ?    0 Yes 0 No

Question { Ambuja, 7467 }

why it is necessary to short and ground of a current
transformer secondary side?


Answer

Shorting is done ,when the ct is not in use or in case of
spare ct, to prevent development of high voltage in
secondary.Grounding is done to remove the influence of high
primary voltage due to capacitance between primary and
secondary, and insulation failure.

Is This Answer Correct ?    0 Yes 1 No

Question { 3249 }

how could we findout the lightning arrester failed or not in
live circuit? Is there any instrument to measure the high
voltage at the time of sky lighting?


Answer

If the L.A. is intact ,you have to assume that it in working
condition.There is no need to test it with high voltage ,as
it is already subjected to working voltage .Only physical
examination may help you.In case of E.H.T,LA ,it is usually
provided with stay-put pointer ammeter to measure leakage
current.You have to replace the L.A. when the pointer enters
the red region.

Is This Answer Correct ?    0 Yes 1 No

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