prakash veer singh


{ City } noida
< Country > india
* Profession * facility administrator
User No # 34051
Total Questions Posted # 2
Total Answers Posted # 15

Total Answers Posted for My Questions # 10
Total Views for My Questions # 16423

Users Marked my Answers as Correct # 273
Users Marked my Answers as Wrong # 68
Questions / { prakash veer singh }
Questions Answers Category Views Company eMail

A heater capacity is 3.0 KW on 415V . if supply voltage is 380Volt . what is heater capacity on 380volt . and how calculate and give formulas . Prakash veer singh Roto power Engg.

5 Electrical Engineering 9612

How much pole motor can be desion for 415 volt ,50 hz.Power supply. in pratical condition . Prakash veer singh

5 Electrical Engineering 6811




Answers / { prakash veer singh }

Question { 10079 }

I am an electrical power engineer and arranged power system
for a data center, I installed MCB, ELCB and erthing system
TN-C-S.
But some times several ELCBs Disconnect circuits at the
same time! what may be the reason? (the ELCBs are 25A ,30mA)


Answer

Dear Mahdi
Some Current is leakege in earth form circuit and
equepment . so your ELCB was trip.so frist check the all
circuit .
you are using TN-C-S earthing .in this common earth use
for nutral and grounding .
I suggested you for use TN-S type earthing .

Is This Answer Correct ?    0 Yes 1 No

Question { 6961 }

To check the earth condition (In plug points); the voltage
between earth and Neutral is in below 5 volts. Is it
correct


Answer

Yes, this is right if earthing condition is good . than the
voltage b/t earth and nutral is less than 5 volt . in
moutain aria , it is about to less than 8 volt .

Is This Answer Correct ?    8 Yes 2 No


Question { HSL, 5947 }

What is Engine?


Answer

Engine is a enegry converter . he convert the chemical
enegry into machnical enegry. chemical enegry like engine
fuel ( deisel ,petrol ) .

Is This Answer Correct ?    3 Yes 2 No

Question { CSPL, 32541 }

sir, plz tell me how much kvar capacitor required for 1000
amp or 500 Kw load ? what is the formula ?


Answer

Dear Shovan
This is Prakash veer
According to madhu's formulas,

KVAR= KW* (tanQ1-tanQ2)

Q1 is intail power factor
Q2 is target power factor

Is This Answer Correct ?    21 Yes 5 No

Question { HCL, 25393 }

I have 725KVA DG set how to Calculate the Ratio of KWH?
Whatb is the Formila


Answer

IT is very sample . Normaly DG's power factor is about to
0.8 .
We multipli the pf from kva , we get KWH of DG.

KWH= KVA*pf
KWH= 725 * 0.8
= 580 KWH

Is This Answer Correct ?    50 Yes 10 No

Question { Shakthi Power Systems, 54114 }

How to select a D.G set for calculated load of 110kW..?


Answer

Our calculated load is 110KW . Normaly, we give 80% load on
DG for best and long opration . DG pf is 0.8.
So DG rating = 110/0.8
= 137.5 KVA
we use 150 KVA or high then.

Is This Answer Correct ?    92 Yes 24 No

Question { 3722 }

Is it posssible to obtain the higher speed(3000rpm) for
adiferentiallly cascaded induction motors(with 8 and 6
poles)


Answer

It's possible when we use higher friquency ( 200HZ) power
supply .

Is This Answer Correct ?    2 Yes 1 No

Question { Lapis Technologies, 32715 }

How Much Capacity of Diesel Genset is suitable for
20 no.s of 1.5ton AC's & Why?(Load Calculation)


Answer

Dear vivak
first , we see.what is EER of used ac system , if ac EER
is 8. ac load less 20% .

then
1.5 ton= 18000 btu = 5.250kw
20 nos. acs load =20*5.250KW
= 105 KW
DG pf is 0.8 and DG safty margine is 20%.
than 105*1.4=147KVA

we use 150kva DG and more .

Is This Answer Correct ?    2 Yes 5 No

Question { 19015 }

how to calculate the powerfactor in induction motor having
name plate details? for example 1 h.p motor 1.86 A 415 V


Answer

Dear Zakir husan
What is 1092 in your equation .
That we know that
p=root3 v*i*cos phi
1 h.p =746 watts = 1.732*415*1.86*cos phi
cos phi= 746/1.732*415*1.86
= 0.55 and pf leging.

Is This Answer Correct ?    12 Yes 3 No

Question { Voltas, 11705 }

How to calculate the size of window A.C. for 200 Sq. ft
room?


Answer

Its depend on heat dispassion in room by equepment and
living person .

Is This Answer Correct ?    10 Yes 3 No

Question { 13935 }

why maintain the Dg PF is 0.8? Explain?


Answer

In DG ,we maintein pf .8 because , if pf decrease than
alternator has overload due to more current dron by load .
And if pf is increase ,than engine has overload due to
increase potational (volt ).

So maintain DG pf is 0.8 .

Is This Answer Correct ?    6 Yes 2 No

Question { 8766 }

Can without battery on line UPS,off line UPS or Invertor
works please brief.


Answer

These system is not working . Because battery is part of
those system. without battery these system is not complete.

Is This Answer Correct ?    5 Yes 3 No

Question { Emerson, 38039 }

What is LOP Sensor in DG??????


Answer

LOP sensor : Low oil pressure sensor
if sensor sence low lube oil pressure ,sent the LOP single
to AMF relay ,and AMF relay trip the DG.

Is This Answer Correct ?    61 Yes 5 No

Question { 6811 }

How much pole motor can be desion for 415 volt ,50 hz.Power
supply. in pratical condition .

Prakash veer singh


Answer

Dear Ali
I know better that Motor supply voltage rating is not
depend on motor pole nombers .its depend on motor winding
turn.

Is This Answer Correct ?    1 Yes 2 No

Question { 4433 }

what is full wave bridge?


Answer

Full wave rectifier is a eletronic divice ,whitch has
convert ac current in dc current in full wave.

prakash veer singh

Is This Answer Correct ?    0 Yes 0 No