piyush rana


{ City } miryalguda
< Country > india
* Profession * jr. manager
User No # 25972
Total Questions Posted # 9
Total Answers Posted # 12

Total Answers Posted for My Questions # 50
Total Views for My Questions # 317574

Users Marked my Answers as Correct # 246
Users Marked my Answers as Wrong # 108
Questions / { piyush rana }
Questions Answers Category Views Company eMail

What is the formula for calculating Transformer Losses & Efficiency. I want to compare the Transformer efficiency at different loading condition.

Rays Power Experts, Techser,

6 Electrical Engineering 157500

How can I calculate the trnaformer effciency at different loading condition?

 2 Electrical Engineering 3817

How much duration I can keep open the CT if it is under loading condition(100 Amp load)?

Infosys, NTPC, Suzlon,

3 Electrical Engineering 5531

What is CBCT ? Why & Where it is used?

BCT,

14 Electrical Engineering 81644

which type of breaker sould be used for different level of voltage ? (i.e at 11 Kv, 33 Kv, 66 Kv....

 8 Electrical Engineering 17859

Why the rating of the HT breakers are in 1250 Amp, while the load on the breaker is around 50 Amp. ?

Wipro,

9 Electrical Engineering 22126

What is the difference between eath fault protection & Restricted Earth fault Protection?

 2 Electrical Engineering 4970

What are protection of transformer on HT side & on LT side?

 4 Electrical Engineering 19803

What is the impedence of Transformer?

 2 Electrical Engineering 4324



Answers / { piyush rana }

Question { Bhushan Power Steel, 23771 }

What is C.T, why it is used and what care should be taken
for that while connecting?


Answer

CT means Current Transformer, It is used to measure the
higher value current flowing through the circuit.
CT should be connected in such a way that the current
should enter from the P1(primary) & leave from P2, Also on
secodary side S1 & S2 should be connected with correct
sequency other wise the meter will not sense the current,
While CT is not in use, we should short the S1 & S2
(Secondary) of the CT to avoid saturation of the CT.
If the seconday of loaded CT will be kept open it will get
saturated & burst.

Is This Answer Correct ?    5 Yes 2 No

Question { 58055 }

why electric shock due to dc is dangerous than that of ac


Answer

In Ac, due to sine wave, the voltage wave is coming to zero
at some instant during this time there is chance to get
released from the sock, but in DC the waveform is straight
& not coming to zero at any instant, So there is no any
chance to get released from the sock.

Is This Answer Correct ?    5 Yes 2 No


Question { Reliance, 11566 }

what is meant by GOD in transmission system ?


Answer

GANG OPERATING DEVICE

Is This Answer Correct ?    38 Yes 6 No

Question { KSEB, 50826 }

Why all voltage levels are the multiples of 11KV?


Answer

All the power generation units generates energy which is
the average value.
We required to use RMS value of the electrical quantities.
So all the average value is multiplies by the form factor
(1.11) to give RMS value, so the all the voltage levels are
multiple of 1.11.

Is This Answer Correct ?    78 Yes 38 No

Question { ICSA, 20589 }

Which type of gas used in cylinder (VCB)?????


Answer

There will be a vacuum no any gas....boss

Is This Answer Correct ?    13 Yes 2 No

Question { ICSA, 20589 }

Which type of gas used in cylinder (VCB)?????


Answer

Dear Mr. Sahil,
You are in dream, I think,
Vacuum means no gas.......?

Is This Answer Correct ?    12 Yes 1 No

Question { L&T, 15470 }

Hai I have 2500KVA,Transformer,13.8KV/380.DELTA/STAR.How
much load that I can take interms of current?How can I
calculate also when I have loads in KW?


Answer

Are Karani,
I think you are not electrical engineer, it is a basic
thing,
You just calculate through following formulas :
KW= 1.732 * V * I * Cosphi

KVA=1.732 * V * I
So, I= 1.732*1000/(V * I)

Is This Answer Correct ?    1 Yes 15 No

Question { Dubai Group, 60474 }

WHAT IS THE THUMB RULE FOR DECIDING THE CURRENT RATING OF
COPPER WIRES SAY 2.5/4/6/10 MM SQUARE SIZES??


Answer

There is no any thumb rule, therer is a standard table from
which we can know the capacity of the cable.
The current carrying capacity is depend upon the size of
conductor(Cross sectional area)

Is This Answer Correct ?    71 Yes 13 No

Question { Field Gun Factory, 23879 }

how to reduce earth to neutral voltage?


Answer

Dear Lalvijaybe,
Just reduce the earth resistance(proper earth connection
should be there).

Is This Answer Correct ?    6 Yes 5 No

Question { 5438 }

During he starting up of the motor, the upstream's MCCB
(350A) always trips due to the UVT relay activated.
Can Star-delta starter use for a 20kW Motor (For a powder
mixer machine) cause voltage-dip in the supply line voltage?
If so, what are the recommended solution to
eliminate/reduce the transient voltage dip in the line
voltage?


Answer

You can check the length of the cable from the supply to
motor, I think It will be more so that due to line
resistance loss during starting the line voltage will go
down for the fraction of seconds.
please mention the connected load, transformer capacity,
volatge incoming etc for further clear answer.

Is This Answer Correct ?    0 Yes 1 No

Question { 20551 }

whats the one main difference between UPS & inverter ?
And electrical engineering & electronics engineering ?


Answer

Dear sripellirajukumar,
I think UPS is uninterrupted power supply where the out put
voltage is present all the time, while in inverter the out
put voltage will be available at the time of mains failure
only.

Is This Answer Correct ?    1 Yes 6 No

Question { BCT, 81644 }

What is CBCT ? Why & Where it is used?


Answer

But for which purpose it is used & how to install it?

Is This Answer Correct ?    16 Yes 17 No