in this question and many other questions it is given like t

in this question and many other questions it is given like this A 46kva , but it is not mentioned load or something like this I don\'t no what does it mean. also if it belongs to the load , is this the case all the time or at the given input voltage and some times we are given the rated current or rated voltage but I really don\'t know what do they mean .I need explanation to this...

Extra Problem: A 46kVA, 2300/230V, single-phase trans open-circuit tests, and the following test r

Solution

Transformers are always rated in kVA because the load with which power will be connected is unknown. The complex power drawn by the load will be 46 kVA maximum at rated input voltage or output voltage to the transformer.

Rated voltage or current means the rating of transformer voltages or I = S / V i.e magnitude of current is equal to complex power here 46 kVA divided by rated voltges , if primary is considered then rated voltage is 2300 V and if secondary is considered then rated voltage is 230 V then rated current will be I_p = 46000/2300 , I_s = 46000/230 .

The load connected should not draw more current then this rated current.

46kVA implies that if load is unity power factor load then real power that can be drawn from transformer is 46 kW.

If power factor leads or lags this active power value will decrease. Suppose pf = 0.8 implies transformer of rating 46 kVA will be capable of supplying a load of 46 * 0.8 = 36.8 kW load at rated terminal voltage.

Thus with power pf of load changes the active power supplied by transformer changes.

46 kVA rating of transformer indicatates the maximum kVA load to connected to the transformer.