Dear Friends, I have a 500KVA transformer supplying whole factory having 3 p

Dear Friends,
I have a 500KVA transformer supplying whole factory having
3 phase and single phase mixed loads. Power room has
ammeters connected via CTs for individual phase. Now I know
that readings shown on meter for each phase say R,Y and B
are line currents. But when I want to know the total on
transformer do I need to add the currents of all three
phases readings shown on meter or value for anyone phase
will give me the correct power load on transformer for that
point of time.

2. If ammeter shows unbalanced readings for R,Y, B phases
say 150, 250 and 300 respectively so can I assume that 150A
i.e average of 3 will be the 3phase load currents and
remaining will be 1phase currents. Please clarify my doubt.

Question Posted / ansi

4 Answers
7465 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phas..

Answer / ahmadmukhtiar

1. The load of R, Y or B will be the total load on
transformer.
2. There must be phase balancing system for protection
otherwise the equipment connected as load will get damaged
if all three phases are unequal.

Is This Answer Correct ?

1 Yes

0 No

Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phas..

Answer / k.prakashchandra

Calculate load(KVA) on each phase and add

Is This Answer Correct ?

1 Yes

0 No

Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phas..

Answer / sakthivel

each phase you find consuming power with use ammeter reading
and volt meter reading
each phase you regulate the load current or equal load
current load you choose

Is This Answer Correct ?

2 Yes

2 No

Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phas..

Answer / abdul karim

If you wants to know the total load of transformer , you must use a watt metrer , OR you will calculate the load in watts of every individual phase then sum of all three phases will be your answer.

Is This Answer Correct ?

0 Yes

1 No

Post New Answer

More Electrical Engineering Interview Questions

figure of phasor diagram of transformer when full load or no load ?

1 Answers Swastik, TCS,

Who is reputed manufacturer of TNC switch for ACB in India ?

3 Answers

why most of the induction motors are delta connected?

7 Answers

how vector surge relay works ?

3 Answers BFL,

what is the difference between neutral and earth?

2 Answers

How addressable fire systems work? Pl. send details with architect.(Loop), also send details regarding Gas system. Pl. help me.Thanks

1 Answers Siemens,

What is difference between Harmonic and Non harmonic Capacitor Bank?

0 Answers TATA,

please send me the L&T Emb. sys. placement papers and entire details of pattren

0 Answers HMM, L&T,

What is the Full form of Rccb,MCCB,

11 Answers Marriott, Maruti Suzuki, MCB, PCC, RCCB, Torrent Pharma,

IC 741 is opampIC..moreover AND OR NOT ICs also have '74' in them.. why is that number specifically used?

1 Answers

how hydrogen cooled alternator undergo maintanence ? that is hydrogen when come in contact with air can result into explosions .

0 Answers DVC,

Hi frnds :) plz tell me that i have 100 KVA 3 phase generator so by thumb rule 100*1.4 = 144 amps and generaly we can operate at 80% load...so it will 144*0.8 =112 amps.... so now i m confused about single phase load.....if we use that generator only for single phase the that 112 amps is total single phase load or i can give 112 amps at red 112 amps at yellow and 112 amps at blue.... i mean that total single phase load that 100 KVA generator will take is 112+112+112=336 amp ??

2 Answers FWO,

For more Electrical Engineering Interview Questions Click Here