Question

Tap-changing and voltage-magnitude-regulating transformers are used to control bus voltages and reactive power flows on lines to which they are connected.

(a) True (b) False

Short answer

The correct answer is (a) true.

Step-by-step solution

Definition of Tap-changing and voltage-magnitude-regulating transformer.

The aim of a tap changer is to adjust a transformer's output voltage by changing the number of turns in one winding and thereby changing the transformer's turn’s ratio.

Voltage magnitude regulating transformer sustains the secondary winding voltage within a limit when the load changes from no-load to full load under varying secondary load conditions.

Determine the tap-changing and voltage-magnitude-regulating transformers.

Tap-changing and regulating transformers maintains a constant voltage with off-loading turns ratio C, shown in figure 1. A Changing turn ratio and voltage regulation correspond to a change in turn-ratio C. The method of power flow standpoint determines the voltage magnitude and phase angles within prescribed limits.

Therefore,Tap-changing and voltage-magnitude-regulating transformers are used to control bus voltages and reactive power flows on lines to which they are connected.

Transformer connections with off-load turns ratio are shown in figure 1.

Draw a circuit diagram of Transformer with off-nominal turns ratio.

Draw a circuit diagram of represented as two Transformers in series.

Draw a circuit diagram of Per-unit equivalent circuit of per unit impedance.

Draw a circuit diagram of $\pi$circuit representation for real c (per-unit admittance is shown: ${\text{Y}}_{\text{eq}}=\frac{\text{1}}{{\text{Z}}_{\text{eq}}}$

Therefore, the correct answer is true thattap-changing and voltage-magnitude-regulating transformers are used to control bus voltages and reactive power flows on lines to which they are connected.

Therefore, the correct answer is (a) true.