Why is the transformer rated in KVA?
Editorial / Best Answer
Answered by: NagaseshaReddy.M
kVA is the unit for apparent power. Apparent power consists of active and reactive power. Active power is the share of the apparent power which transmits energy from the source (generator) to the user. Reactive power is the share of the apparent power which represents a useless oscillation of energy from the source to the user and back again.
It occurs when on account of some »inertia« in the system there is a phase shift between voltage and current. This means that the current does not change polarity synchronous with the voltage. But the heat generated in a winding as well as the eddy current losses generated in a transformer core depend on the current only, regardless of whether it aligns with the voltage or not.
Therefore the heat is always proportional to the square of the current amplitude, irrespective of the phase angle (the shift between voltage and current). So a transformer has to be rated (and selected) by apparent power.
- Transformer design and construction
- Impedance matching
- Star/delta transformer
- How to get the last day of the current month?
- Transformer concept
- What is meant by breaking voltage in transformer?
- What happens if DC supply is given to a transformer?
- How to get top five rows in datastage?
- Isolation transformer
- How will you differentiate the transformer
- Transformer stage compilation error in ascential datastage 7.5, windows xp
- Unknown transformer variable definition
- Relation between mutual flux , useful flux & power factor of a transformer.
- Transformer primary current
- Min bdv transformer oil
- Concrete transformer frame
- Transformer rating
- Power transformer design