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Question { 3327 }
A group of machines (wind turbines) connected with 33KV
feeder and each machines are having individual VCB. The 33KV
feeder connected with 110KV/33KV substation. The 33KV feeder
tripped by over current at Substation and fault recorded at
Substation as OC-R&Y phase. Same time the group of machines
VCB tripped by over voltage, the fault recorded voltage was
above 66KV by numerical Under/Over voltage relay. While grid
drop time, this much of voltage hike is possible?
Answer
to twice the normal speed ,hence the voltage may also become
twice. Over voltage relay should be set at not more than
120%.You can employ the AVR so that the voltage does not
increase with the speed.
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { HBL Power Systems, 6941 }
What is the permissible value of earth resistance and as per
which standard / act / rule ?
Answer
KV-5,66 KV-2,110 to 400 KV-1 and for gen stn -0.5
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 3730 }
in magnetic field we send current to generate flux,why not
voltage?
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
why battery dc voltage become Half when we check with
respect to ground for example 120volts + and - terminals
and when we check + terminal with Earth thats 60volts why
60volts we can not ground the battery.
Answer
earthed.The potential of ground is taken as +/- 0.The
voltage measured between any terminal wrt ground will be +/-
half the full voltage.This method is helpful to trace a
single polarity and for earth fault locator.
| Is This Answer Correct ? | 6 Yes | 3 No |
why battery dc voltage become Half when we check with
respect to ground for example 120volts + and - terminals
and when we check + terminal with Earth thats 60volts why
60volts we can not ground the battery.
Answer
indicator ,you are able to measure voltages. And if you run
both leads along the ground or a metal surface ,you can
measure voltages with a digital voltmeter ,as the
capacitances between the leads and the surface/ground, bring
the surface/ground to +or- zero potential.
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 7315 }
HOW TO CALCULATE BATTERY BACKUP TIME & AH CAPACITY AGAINST UPS
KVA RATING?
Answer
the KVA rating of the UPS.
| Is This Answer Correct ? | 3 Yes | 0 No |
DEAR ALL
I have motors ( 10 units )each one is 90kw 380V 50 HZ 1000rpm
but new local pwer is 220v 60 hz
requierd rpm should be 1000
pleas what the beast solution is used frequncy converter or
rewinding all motos or chang all motors
thanks
Answer
synchronous speed with supply at 60Hz.
| Is This Answer Correct ? | 1 Yes | 0 No |
why battery dc voltage become Half when we check with
respect to ground for example 120volts + and - terminals
and when we check + terminal with Earth thats 60volts why
60volts same result on 24Volts and with ground 12Volts only
expert answer that thanks
we can not ground the battery.
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 5142 }
In a incandescent bulb, if the glass is punctured, and then
power is supplied, the tungsten filament blows up with a
flash.Why?
Answer
| Is This Answer Correct ? | 2 Yes | 1 No |
Question { 3921 }
how to calc. current for 5MVAR,50hz,33kv
Answer
| Is This Answer Correct ? | 5 Yes | 3 No |
Question { 5227 }
what are the reasons for overheating in electrical machines?
Answer
| Is This Answer Correct ? | 0 Yes | 6 No |
Question { 38470 }
What happen when the AVR of the generator fails? Will it cause
power instability and total failure of the alternator?
Answer
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 38470 }
What happen when the AVR of the generator fails? Will it cause
power instability and total failure of the alternator?
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
