power transformer

Power transformer is a transformer that steps up or step down voltage for transmitting electrical energy for the utility. They are rated with kVA capacity and voltage transformation ratio ( Example Transformer rating : 500 kVA , 11/0.43 kV )

Other Transformers are like :-

Current transformer( CT )

Potential transformer (PT)

Control transformer

Impedance Matching transformer

RF Transformer, IF transformer, AF transformer, HF / MF Water cooled Isolation transformers etc.

Is also a transformer that the ratio is one to one (expl. 480V to 480V=1)

ACCHA ANSWER HEY

Dear Sir,

Only the Voltage Level is denoted in KVA/MVA. The transformer rating shall be in MVA/kVA.

Best Regards,

N.Suresh

Dear Suresh,

When we use a transformer for welding set / Transformer for Battery charging , it is power transformer only even though it is 440 volts / less than 100 volts . But normally in common use power engineers may consider large medium and high voltage distribution transformers as power transformers. But all other power utility transformers are also technically categorised as power transformer.

Simply denoting a power transformer is used to transmit or transform power from usually one Voltage to another. In certain cases of course, the Voltages are same on either side (for Isolation transformers)

It is usually conencted across line on the inlet side, and on the outlet side you draw a useful power (KW)

Voltage transformer is also across line (parallel) but the power drawn is negligible (since i≈0)

The current transformer is series connected and here also power is almost zer (theoritically zero since here V≈0 )

transformer is static machine there is no moving part ,the rating of trf depends on votage and current