Why rating in kva

But the output of the transformer will be:. Again putting the value from secondary Same value if we put the values from primary. Now rating of the transformer:. It means, 11kVA transformer rating means it can handle 11kVA. It is our turn to transform and utilize the 11kVA as 11kW we can do it by improving the power factor to 1 in case of pure resistive load which is not predictable and even very hard to get in case of inductive and capacitive loads where the power factor would have different values.

From the above example, it is clear that the rating of the transformer is same 11kVA but different output in power 11kW and 6. So these are the exact reasons for transformer rating in kVA instead of kWA. Good to know:. You may also read about:.

I understand your logic Mukesh Khatri. However, its a technicality to distinguish between real, apparent and reactive power. There are other instances where units are renamed to simplify rewriting the base units. In this case they rename the unit to distinguish between the types of power. Again I am little bit confuse about the unit of Transformer. Dear Mukesh Khatri. Then the unit becomes Watt…. Why not to write Watts? Watt is a unit of real power or actual power…i.

Look…There are three kinds of Power. Active Power, Re-active Power and Apparent power. Which connection is better for Capacitor Bank Star or Delta? What is the Meaning of mAh in Battery? Difference between Analogue, Digital, and Power Electronics. Search on this website. Popular Articles. In actual practice, the pure inductive lagging and pure capacitive leading loads do not exist, i.

Hence, the practical loads draw both active and reactive powers from the supply. For example, an induction motor has windings which are inductive and also possess some resistance. Also, the current drawn by the load depends upon the power factor of it, which is not determinant to the manufacturer at the time of designing.

Transformers are rated in kVA or VA and not in kilowatts. It can be noted that all those electric loads such as motors, lamps, heaters etc. In this article illustrates why transformers are rated in kVA and why not it is rated in kW. Any piece of electrical equipment is rated based on how much current it can handle at a particular voltage and the losses occurring in it.

The same applies to power transformers also. Transformers are rated based on the maximum power that they can transfer from their primary side to the secondary side while taking losses in the account. KVA stands for kilo-volt-ampere, which basically is the unit of electric power. While calculating kVA of any piece of equipment the power factor is not taken into account. This means kVA is the unit of measurement for that equipment in which the output power is independent of power factor.

On the other hand, KW KiloWatts is also the unit of electric power for that equipment in which power factor plays a role.