Q. What is a transformer??
A. A transformer is an electrical apparatus that is designed to convert one voltage to another through magnetic induction. It has no moving parts and is a passive device.
Q. Why are transformers rated in KVA not KW??
A. Generally, there are 2 kind of losses in a transformer; Iron losses and copper losses. Since iron losses depend on voltage and copper losses on current, the total losses depend on voltage and current, and no power factor is involved. Transformers are rated in KVA as kW would include power factor.
Q. Can a transformer rated at 60Hz operate on a 50Hz service?
A. A transformer designed for 60Hz cannot operate on a 50Hz service as more losses will occur and lead to higher temperature rise and shorter life span. On the contrary, a transformer rated 50Hz can operate on a 60Hz service..