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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.
GE,
6 Electrical Engineering 16420What iz main protection of mediuum voltage motors and what iz the standard IR voltage of 6.6 and 11kv motors.
GE,
1 Electrical Engineering 2727why 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.
2 Electrical Engineering 4011If Polarization index of motor 8.75 at 500volts of medium voltage 4.16 KV motor what this mean winding good or bad pl answer if any reffrence book give me the link
Electrical Engineering 1720
Question { 13081 }
how to do CT Burden test
Answer
decide the CT size and accuracy the formula for calculate
total resiatance * Fault current
Voltage at the time of fault-------------------------
CT ratio
For example that voltage 34Volts and the ct saturate
voltage 40Volts thats a knee point so we select a ct that
have less than 40volts
| Is This Answer Correct ? | 0 Yes | 1 No |
wat is the difference between real power and reactive
power..which is useful..?and how it s useful..wat is the
effect of these on a power system...
Answer
Which iz doing the real work lighting heating etc
Reactive power
Which iz used for the magnetizing of motors,transformers
and generators coils.
active power iz use ful but with out reactive power u never
magnetize any motor transformer or generator u can just
only improve the power factor to reduce ur loss.
KVA * PF = KW
for example
100 * 1 = 100 KW
IF pf 0.8
100*.8= 80KW
| Is This Answer Correct ? | 1 Yes | 1 No |
Question { 33739 }
what is dc transformer? how it work?
Answer
| Is This Answer Correct ? | 4 Yes | 2 No |
Question { 5427 }
what is diffrential relay used in generator
plz give brief explanation
Answer
diffrential relay for example two cts one on generator
phase ct and other r on neutral side both cts passing for
example 5amps but the direction of current iz opposite so
the resultant iz zero that senses the relay if there is any
fault in the generator so the current increase on fault
side and the dirrence current increase and relay trip the
CB that iz the protection of generator transformer winding
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 44689 }
What is fuction of NGT/NGR using in Generator.
Answer
NGR connected between earth and star point of generator
during normal condition only limited current or zero
current flow in the ground side but during fault there r
too much current that limit the NGR with the help of
resister and relay setting according to that minimize
current that tripped the breaker of generator
Have a good day man
| Is This Answer Correct ? | 15 Yes | 1 No |
Question { 5282 }
what is meant by reactive power ,active power & real power ?
thank you
Answer
that is used for magnetizing the coils of generator
transformers and motors
P= root of 3 *V*I* sin theta
Active power
that is doing the actual work like heating lighting and
rotating.
P= root of 3 *V*I* cas theta
| Is This Answer Correct ? | 1 Yes | 1 No |
Question { 5800 }
what need of NGR(neutral grounding registor)? What it works?
Answer
installed in between generator neutral point and earth in
case of fault that limit the fault current that is of
diffrent type resiatance type, reactance ,petrson coil
earthing. In case of one phase fault that NGR limit the
current and relays detect that and trips the generator.
| Is This Answer Correct ? | 0 Yes | 0 No |
in the exciter the power is feeded from battry or control
or whatever.and we need it in the generators for the
stating . do we need it in the shutdown also?i mean the
exciter>
Answer
excite the generator with DC the rotor moves and generate
electricity during shut down the dc supply breaker should
be off.
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 3310 }
Is it benefitial to supply 210v ac to lighting fixtures
instead of 240v ac?
Answer
increase
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 3337 }
Abb 11kv how it is closing automatically when the cb is racking in and rack out when it reaching test position
Answer
for only automatic operation when breaker rack out another
limit switch closed at rackout position so only manual
operation or test position operation possible
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 4219 }
I have running 4 generator in paralel.All generators
Voltages is same(470 V),KW also same (100 KW) but only No2
generator Amper is high than another generators.
DG No:1,3,4 470V,100KW, 150 A
DG No:2 470V,100KW,400 A
Answer
current will increase active power will also increase so u
check ur meters once again
| Is This Answer Correct ? | 2 Yes | 1 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
directly connected to load but when we check its voltage
with respect to ground that half moreover i cant understand
the rectifier transformer.
Thanks for ur time and consideration.
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 5433 }
how much current will be drawn by 3 phase, 415v, 50 hz, 20
ton central ac
Answer
20 * 1250 = 25KW
P = 1.732 * V *I * Caso
25000=1.732*415*I*0.8
I=43.47Amps
| Is This Answer Correct ? | 4 Yes | 3 No |
Question { 3990 }
what is real power and reactive power?
Answer
rotating and reactive power is used for excitation purposes
of winding of transformer generator and motorss
| Is This Answer Correct ? | 3 Yes | 2 No |
