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 9 of 13.
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
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?
Murali said:
1 decade ago
The output rating of transformer in KVA=v*i
=2000*8
=16000
=16KVA
=2000*8
=16000
=16KVA
Murali said:
1 decade ago
The output rating of transformer in KVA=v*i
=2000*8
=16000
=16KVA
=2000*8
=16000
=16KVA
Sankar said:
1 decade ago
kva=V*I
kva=2000*8
=16000
=16kva
kva=2000*8
=16000
=16kva
Ravikant said:
1 decade ago
Why the losses (c&i) are calculaed in kva of transformer why not in kw?
SANTHOSH 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.
Santhosh said:
1 decade ago
Hello my dear friends we have to follow these steps to select transformer
we know that
p=VIcosQ for single phase and p=root3*v*i*cosQ for three phase
so power = 2000*8*0.95
= 15200= 15.2kw
Then
we know that power factor=KW/KVA
Consider 0.95 PF for transformer
0.80 PF for generator
so KVA=KW/PF=15200/0.95 = 16KVA
we know that
p=VIcosQ for single phase and p=root3*v*i*cosQ for three phase
so power = 2000*8*0.95
= 15200= 15.2kw
Then
we know that power factor=KW/KVA
Consider 0.95 PF for transformer
0.80 PF for generator
so KVA=KW/PF=15200/0.95 = 16KVA
ADITYA PRASAD TRIPATHY said:
1 decade ago
We know that KVA=VOLATGE*CURRENT/1000
SO VOLTAGE =2 KV= 2000 VOLT
CURRENT=8 AMP
SO KVA = 2000 * 8 / 1000
=16000 /1000
16
SO KVA=16 SO SIMPLE.
SO VOLTAGE =2 KV= 2000 VOLT
CURRENT=8 AMP
SO KVA = 2000 * 8 / 1000
=16000 /1000
16
SO KVA=16 SO SIMPLE.
Archana said:
1 decade ago
Actualyy rating of a transformer is in Kilo Volt ie KV
1KV = 1000 Volt
Therefore divided by 1000
1KV = 1000 Volt
Therefore divided by 1000
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