copper loss is directly propostional to I (AMPERE) and iron loss directly propostional to V (VOLTAGE) then total losses is equal to volt ampere hence the rating of transformer in KVA.
SULTAN
The KVA of Transformer is a Power rating of the transformer
Which is specified due to the iron loss and core loss of the
Transformer. VA means volt-ampere
Another Answer
This is the product of the secondary rated current and secondary rated voltage.
That is the power rating of a transformer. It's given in KVA because the it's apparent power and there's no power factor because the transformer's losses are so low that they can be ignored.
AnswerThe rating of a transformer is the product of its rated secondary voltage and its rated secondary current. The product of voltage and current (in a.c.) is measured in volt amperes. Power factor is determined by load, not the transformer. As the transformer manufacturer has no means of knowing the nature of the load to be connected to his transformer, he cannot rate it in watts because he has no idea of the power factor of the load.
Just the multiplication of Voltage rating and the current rating...
or else,
the amount of power it can handle...
VA or KVA or MVA
The rating of the machine (kva or kw) depends upon the power factor, since the load power factor to which the transformer is supplying power is not known, it may be capacitive, inductive, or resistive that is why its rating is in kva not in kw.
What limits the use of a transformer is its operating temperature, as excessively-high temperature will act to break down its insulation. The temperature reached by a transformer is a function of its rating (expressed in volt amperes), so operating a transformer below its rating is perfectly okay.
Transformers are rated in KVA because that is a more accurate way to measure their capacity requirements. KWH is apparent power, while KVA is true power, and the ratio between them is power factor. The power factor is a function of the load, and not the transformer, so a poor power factor would make KWA look less to the transformer while, in fact, the true power, if not met by the transformer, could overload the transformer.
Transformers are rated in KVA, both the primary and secondary windings have the same KVA rating. (KVA is the voltage multiplied by the amperage then divided by 1000). If you have a 10 KVA step up transformer with 120V on the primary: A = 10k / 120 = 83.33A and if the secondary produces 240V: A = 10k / 240 = 41.667A
Depends on the kva rating of the devices to be tested using a transformer.
yah! definately affects, the kva of transformer is suitable for the certain load according to the rating.
transformer action doesn't depend on power factor that is why we indicate its rating in KVA
VA or KVA or MVA
Yes, but your input current is going to be high at 133 amps. The output of the transformer is not going to be 16 KVA, that is the rating of the transformer.
This is the rated output of the transformer, obtained by multiplying the rated secondary voltage by the rated secondary current. And it's 'kV.A', not 'kva'.
ka of mccb=transformer(KVA)x100/1.732xsecondary voltagex%impedence of transformer
The kVA rating will be listed on the transformer's nameplate, which is usually on the front of the transformer. The 480v to 120v is irrelevant, because many transformers with different kVA ratings convert 480 volts to 120 volts. The kVA ratings can be different and thus affect the rated current through the transformer.
The result is that the transformer runs cool and contented. The '250 KVA' rating on the transformer is its maximum ability to transfer power from its input to its output without overheating, NOT an amount of power always running through it. If the 3 KVA load happens to be the only thing connected to the transformer at the time, then only 3 KVA flows into the transformer from the primary line, and only 3 KVA leaves the transformer secondary.
because we dont know power factor of the secondary laod
All transformers have a power rating given in kVA which determine the maximum load that can be connected to that transformer.
The rating of the machine (kva or kw) depends upon the power factor, since the load power factor to which the transformer is supplying power is not known, it may be capacitive, inductive, or resistive that is why its rating is in kva not in kw.