Why Alternator/Generator Rated in kVA. Not in kW?

As we definitely realize that why transformer evaluated in kVA rather than kW, the same reason here, for example, the power √3 VL IL Cos θ conveyed by the alternator and generator for a similar estimation of current, relies on p.f. (Power Factor=Cos θ) of the heap.

Be that as it may, the alternator conductors are determined for a distinct current and the protection at an attractive framework are intended for a clear voltage free of p.f. (Cos θ) of the heap. Consequently, clear power estimated in kVA is viewed as the evaluated intensity of the alternator.

Why Generator and Alternator evaluated in kVA. Not in kW?

The primary elements producers consider while planning electrical gadgets and apparatuses which give electric power like a transformer, UPS, alternators and generators, etc are burden and power factor. As they don't know precisely what is power factor and which sort of burden will be associated with the gadget and machines.

So they essentially plan and rate the electrical gadget as per its most extreme flow yield that the conduits can securely convey while they consider solidarity power factor (if there should be an occurrence of unadulterated resistive burden).

If we interface inductive or capacitive burden (When the power factor isn't at any rate solidarity), The yield would vary than as there are misfortunes happens because of low influence factor.

Consequently, KVA is a clear power which does not consider the PF (Power factor) rather than KW (Real Power).

Where:

KW= KVA X Cos θ

What's more, kVA = KW/Cos θ.

For instance,

If there should arise an occurrence of solidarity Power factor (1) for example unadulterated resistive burden. A 100kVA generator or alternator would give careful 100kW according to the accompanying equation.

P = V x I x Cos θ

kW = V x I x Cos θ

kW = 100 x 1 = 100 kW

On the off chance that we put the estimation of Cos θ as 1, The genuine power (kW) would be equivalent to the apparent control (kVA)

If there should arise an occurrence of inductive or capacitive burden, assume the power factor is 0.80.

Presently the genuine power would be

kW= KVA X Cos θ

kW = 100 X 0.80

kW= 80 kW.

Presently you now that why alternators, generators, transformer and UPS and so on are evaluated in kVA rather than kW.