When a 400 Hz transformer is operated at 50 Hz frequency its KVA rating is?

If magnetizing current goes beyond certain limit, the transformer core may saturate. Therefore, it is required to reduce applied voltage along with frequency in same proportion to keep the magnetizing current same. This will reduce applied voltage (400/50 = 8) by 8 times and thus its KVA rating too will reduce 8 times.

What will happen if a power transformer designed for operation on 50 Hz frequency were connected to 500 Hz frequency source of the same voltage?

50 Hz Transformer Operated on 500Hz If the frequency is too much high as compared to the rated frequency, the inductive reactance of the primary will prevent the primary from drawing sufficient power. The hysteresis losses and eddy current losses will be excessive.

What happens if a transformer rated at 5hz is connected at 50Hz?

The transformer may start to smoke and burn with blast leading to dangerous fire. Transformer with same rating is connected to the 5Hz supply source. We will do the same calculation to find the current in case of lower frequency than rated frequency of 50Hz.

Why does a transformer get hot when running at low frequency?

However, if you operate it at lower frequencies, the hysteresis loop extends towards the deep saturation causing the transformer to draw a huge magnetizing current. Observe that for 100 Hz current can be at least 30 times more than what it was at 1000 Hz. This will heat the transformer up. If your cooling sys

What is the effect of high frequency on power transfer?

The amount of transferred power is too much low as compared to the rated power in case of higher frequency of 500Hz. As mentioned above, when current is reduced through high inductive reactance (due to high frequency where XL = 2πfL), power will be reduced because current is directly proportional to the power.

What are the effects of high core saturation in a transformer?

Due to high degree of core saturation (as the frequency is coming down from 400Hz to 50Hz), transformer will malfunction. Secondary voltage will become non-sinusoidal and voltage ratio will not remain what we expect according to turns ratio.