Electrotechnical Systems

42 Electrotechnical Systems

taken into account additionally. The main special feature of the transformer is that to

the rst primary (upper on the left) or to the rst secondary (upper on the right), the

evenly spaced taps can be added, so the voltage between two next taps is equal to the

winding total voltage divided by the number of taps plus 1. The total resistance and

leakage inductance of the winding are evenly spaced along the taps. This transformer

model is usually used for the simulation of the transformer that is controlled under load

with the aim to keep constant the bus voltage. The requested range of the voltage chang-

ing is ±(10%–20%) of the rated value. The tap number is 6–10. Usually, the transformer

has the main primary or se ...