## VOLTAGE REGULATION OF TRANSFORMER

With constant voltage applied in primary, the secondary terminal voltage will decrease due to voltage drop across its internal resistance and leakage…

## SUMPNER’S TEST

To determine the rise of maximum temperature of a transformer, its load test is of utmost importance. Using suitable load impedance, small…

## POLARITY TEST OF A SINGLE-PHASE TRANSFORMER

Polarity testing of transformers is vital before connecting them in parallel. Otherwise, with incorrect polarity, it is not possible to connect them…

## PER UNIT RESISTANCE, LEAKAGE REACTANCE AND IMPEDANCE VOLTAGE DROP

Full-load voltage of a transformer can be expressed as a fraction of the full-load terminal voltage. Let I1fl be the full-load primary…

## LOSSES IN A TRANSFORMER

Two types of losses occur in a transformer: Core loss or iron loss occurs in a transformer because it is subjected to…

## Kapp’s Regulation

Kapp had designed a diagram shown in Figure 1.42 to determine the regulation at any power factor. The description of the construction…

## EXACT VOLTAGE DROP

In Figure 1.40, the exact voltage drop is AH instead of AG. During calculation of approximate voltage drop, AG has already been…

## Electric Field and Magnetic Field

When charges are separated, a space is created where forces are exerted on the charges. An electric field is such a space.…

## EFFICIENCY OF A TRANSFORMER

Due to the losses in a transformer, its output power is less than the input power. ∴ Power output = Power input…

## CALCULATION FOR VOLTAGE REGULATION

The voltage regulation up is expressed mathematically by Positive sign is for lagging power factor and negative sign is for leading power…