Single phase transformer and net KVA output

In summary, a 4 kva, 230/115 volt, 400 HZ, single phase transformer originally designed for use in air crafts, can be used in a laboratory for obtaining 115 volt supply from standard 230 volt, 50 HZ mains without overloading the device. The net kva output would be 0.5 kva. However, it is important to note that the input voltage must not exceed 17.25 VRMS for proper use at a frequency it wasn't designed for.
  • #1
anand raj
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0

Homework Statement


a 4 kva, 230/115 volt, 400 HZ, single phase transformer originally designed for use in air crafts, is available in a laboratory for obtaining 115 volt supply from standard 230 volt,50 HZ mains if overloading of the device is not permitted then net kva output is...

Homework Equations


The Attempt at a Solution

[/B]
here frequency is varying voltage remaining the same
kva being proportional to frequency
x = kva output for 50 HZ
4/x = 400/50
x = 0.5 kva
i don't know whether it is right or wrong, but the answer is this.
 
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  • #2
The wording of the question seems to imply (but stops short of stating unequivocally) that the transformer is to deliver 115V at 50Hz. I can't offer a technical opinion, but according to this reference http://www.edn.com/design/component...sformer-at-a-frequency-it-wasn-t-designed-for
For a power transformer designed for 115VRMS at 400 Hz but used at 60 Hz, the input voltage must not exceed 115×60/400 = 17.25 VRMS

Perhaps others can offer a critique of the suggested scheme.
 

Related to Single phase transformer and net KVA output

What is a single phase transformer?

A single phase transformer is an electrical device that is used to transfer electrical energy between two or more circuits through the process of electromagnetic induction. It is typically used in residential and small commercial applications to step up or step down voltage levels.

How does a single phase transformer work?

A single phase transformer works by having two or more coils of insulated wire wound around a common iron core. An alternating current (AC) is passed through the primary coil, generating a magnetic field. This magnetic field then induces a voltage in the secondary coil, transferring the electrical energy from one circuit to another.

What is the net KVA output of a single phase transformer?

The net KVA (kilovolt-ampere) output of a single phase transformer is the maximum amount of power that the transformer can handle without overheating. This value is determined by the size and design of the transformer and is typically labeled on the transformer itself.

How is the net KVA output of a single phase transformer calculated?

The net KVA output of a single phase transformer can be calculated by multiplying the voltage (in volts) by the current (in amps) on the secondary side of the transformer. This value is then divided by 1000 to get the net KVA output. For example, if the secondary voltage is 120 volts and the secondary current is 10 amps, the net KVA output would be 1.2 KVA.

What factors can affect the net KVA output of a single phase transformer?

The net KVA output of a single phase transformer can be affected by factors such as the quality and condition of the transformer, the ambient temperature, and the load on the transformer. It is important to properly size and maintain the transformer to ensure it can handle the required KVA output without overheating.

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