What are formula we can apply to determine the HT/LT current of 11KV/433V tran

What are formula we can apply to determine the HT/LT current of 11KV/433V transformer except KVA/LV×√3. ?

Question Posted / pradyumna171

2 Answers
37675 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

What are formula we can apply to determine the HT/LT current of 11KV/433V transformer except KVA/L..

Fourmela No 1 power in one phase/Voltage in one phase(I.e phase voltage)
example there is a 300 KVA 11KV/433 V transfomula. Power in one phase 300KVA/3 =100KVA both in HT & LT side, Phase voltase in HT side 11/√3 = 6351Volt .Phase voltage in LT side 433/√3 = 250 Volt.
According to formula HT side current 100,000/6351 = 15. 7 amps. and LT side current 100,000/250 = 400 amps
Formula No 2 for HT side transformer in kVA/20 and for LT side KVA×4/3. field lineman are using this formula.
According to this formula 300 KVA transformer's HT side current 300/20 =15 amps apporximately +5℅ may added for big size to accurate value. And LT side current 300×4/3 = 400 amps apprx.
In general formula for 300 KVA 11KV/433V transformer HT side current KVA/LV×√3 i.e 300000/11000×1.732 = 15.7 amps .LT side current 300000/433×√3 = 400 amps

PRADYUMNA CHANDRA PANDA
mob No 943
7917849

Is This Answer Correct ?

4 Yes

6 No

What are formula we can apply to determine the HT/LT current of 11KV/433V transformer except KVA/L..

Answer / haider

P=Root3 *VIcos$
P=KVA rating of DTR
V=primary volage (HV side)
cos$=power factor
Exp:
100KVA DTR
primary volage =11000V
let Power factor=0.97
I=kva/1.732*11000*0.97
I=5A

Is This Answer Correct ?

12 Yes

18 No

Post New Answer

More Electrical Engineering Interview Questions

which turbine has high thermal efficiency a)open gas turbine b)close gas turbine

2 Answers

What is the purpose of taking Capacitance and Tan Delta Test in Transformer bushing?

2 Answers

what is difference between DC and Ac

5 Answers Birla,

What are the tests carried out on transformer while testing at sites?..Pls explain me in detail

2 Answers Suzlon,

what is S.D.F stands for ? (S.D.F unit 80 amp , TPN )

6 Answers

what is effect of length of air gap on performance of dc motor and generator?

0 Answers DEI,

what is the function of conservater in transformer

3 Answers

Can a generator rated 400 V, 60 Hz be used in a 50 Hz System? Yes or No ? Why ?

1 Answers VECL,

STATE AND EXPLAIN SUPER POSITION THEOREM.

3 Answers ABB,

what is meant by tranformer impedance?

0 Answers Synergy,

why when i start my diesel generator it takes 1 minute or less then stop, and i checked the oil sensor is ok and when the generator start i can get 220 voltage but it it is stop after 1 minute or less, how can i solve this problem?

1 Answers

What is the principle of HIGH SPEED DIRECT DRIVE MOTOR ?

0 Answers Honeywell,

For more Electrical Engineering Interview Questions Click Here