Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 1)
1.
What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?
Discussion:
121 comments Page 6 of 13.
Vimal said:
1 decade ago
Mr madhusudhan.
By saying same voltage across the current & voltage in primary &secondary winding. Then, how could we step up &step down voltage of an transformer by using this concept?
By saying same voltage across the current & voltage in primary &secondary winding. Then, how could we step up &step down voltage of an transformer by using this concept?
Hareesh said:
1 decade ago
p (k.w) = vi* p.f
Here secondary voltage = 2 kv
Total load = 8 amps
power factor =0.9
k.w =kva * p.f
= 2000 * 8 * 0.9/1000=14.4
kva = k.w /pf
=14.4/0.9=16 kva
Here secondary voltage = 2 kv
Total load = 8 amps
power factor =0.9
k.w =kva * p.f
= 2000 * 8 * 0.9/1000=14.4
kva = k.w /pf
=14.4/0.9=16 kva
Priya said:
1 decade ago
Q=v*i*10^-3
Q=20000*8*10^-3
Q=16kva
Q=20000*8*10^-3
Q=16kva
P.H.Hussain said:
1 decade ago
We know that,
Power P=voltage*current
P=2*8=16kw (or) 16kVA.
Power P=voltage*current
P=2*8=16kw (or) 16kVA.
Virendra mandloi said:
1 decade ago
Why we note transformer's power in kva or mva? but why we do not in khva or mhva?
Bhushan Kumbhalkar said:
1 decade ago
KVA=V1*i1=V2*i2.
Therefore here, V2=2KV, i2=8Amp.
Then, KVA=V2*i2.
KVA=2*8;
KVA=16.
Therefore here, V2=2KV, i2=8Amp.
Then, KVA=V2*i2.
KVA=2*8;
KVA=16.
Mohd tajammul akhter said:
1 decade ago
The transformer rating in kva when 2kv is multiplied by 8a then it become 16kva.
L P RAI said:
1 decade ago
We know
E2/E1=N2/N1=I1/I2
>E2/E1= I1/I2
>E1*I1=E2*I2
=2Kv *8A
=16 KVA
We should note (in this question) the rating of transformer meanse input kva rating the out put voltage and current i.e load current is already given.
E2/E1=N2/N1=I1/I2
>E2/E1= I1/I2
>E1*I1=E2*I2
=2Kv *8A
=16 KVA
We should note (in this question) the rating of transformer meanse input kva rating the out put voltage and current i.e load current is already given.
Kedar apkar said:
1 decade ago
p=vicosQ for single phase p= root3*VICosQ for three phase
Consider 0.95 PF For transformer
0.80 PF for generator
p=2000*8*0.95
= 15200=15.2KW
So PF = KW/KVA we need KVA rating
KVA= KW/PF
= 15.2/0.95=16KVA.
Consider 0.95 PF For transformer
0.80 PF for generator
p=2000*8*0.95
= 15200=15.2KW
So PF = KW/KVA we need KVA rating
KVA= KW/PF
= 15.2/0.95=16KVA.
Siri said:
1 decade ago
Here how we can assume power-factor values?
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