Why voltage regulation of a transformer is always negative for capacitive load?

When a transformer have negative voltage regulation that indicate that the load is?

Negative voltage regulation means the voltage increases with the load. This is a very undesirable condition because it can lead to an unstable condition. Many loads use more power as the voltage increases. Thus, the voltage goes up, causing the power to go up, potentially causing the voltage to go up some more.

Why regulation is positive for lagging load and negative for leading load?

The ratio (E2-V2)/V2 is per unit regulation. As load current increases,the voltage drop tends to increase V2 and drops more and more. In case of lagging power factor V2<E2 ,we get positive voltage regulation but in case of leading power factor E2<V2,we get negative voltage regulation.

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Why sometimes the voltage regulation of a transformer is positive and sometimes negative?

If the transformer supplies a very low lagging power factor, large secondary currents will flow resulting in poor voltage regulation due to greater voltage drops in the winding. … Therefore positive regulation produces a voltage drop in the winding while a negative regulation produces a voltage rise in the winding.

Under which conditions can voltage regulation be positive or negative?

At unity and lagging power factor loads, the terminal voltage is always less than the induced EMF and the voltage regulation is positive. At higher leading loads, the terminal voltage is greater than the induced EMF and the voltage regulation is negative.

Why does power factor of load effect voltage regulation of a transformer?

The voltage regulation of the transformer is the percentage change in the output voltage from no-load to full-load. And since power factor is a determining factor in the secondary voltage, power factor influences voltage regulation. This means the voltage regulation of a transformer is a dynamic, load-dependent number.

What does good voltage regulation of a transformer mean *?

A good voltage regulation of a transformer means. output voltage fluctuation from no load to full load is least. output voltage fluctuation with power factor is least. … difference between primary and secondary voltage is maximum.

When the load PF is leading Then voltage regulation is positive negative zero may be positive or negative?

From the above formula, we can observe that voltage regulation can be negative only for capacitive loads or leading loads. And voltage regulation can be positive and zero also for the leading power factor.

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Why voltage regulation of an alternator is negative for leading power factor?

Explanation: Voltage regulation for an alternator operating at leading power factor is negative due to magnetizing nature of armature reaction. Explanation: Field flux gets aided by the armature reaction leading to higher Vt.

When the load PF is lagging then voltage regulation is?

(i) When the load p.f. is lagging or unity or such leading that I R cos φR > I XL sin φR, then voltage regulation is positive i.e., receiving end voltage VR will be less than the sending end voltage VS. (ii) For a given VR and I, the voltage regulation of the line increases with the decrease in p.f. for lagging loads.

Why is voltage regulation important in a transformer?

Significance of Voltage regulation

It is necessary to maintain the supply voltage of the equipment supplied by the transformer. Because the supply voltage directly affects the performance of the equipment. Hence, the voltage regulation of the transformer is significant.

Why is voltage regulation necessary?

The voltage regulator is needed to keep voltages within the prescribed range that can be tolerated by the electrical equipment using that voltage. … Voltage regulators also are used in electronic equipment in which excessive variations in voltage would be detrimental.

Can voltage regulation be greater than 100?

The efficiencies of step-down converters are typically more than 90%, and in high-voltage systems (Vin > 100 V) they can be as high as 98%. … The fuel cell system may be connected to a single AC voltage (typically in domestic applications) or to a three-phase supply (in larger industrial systems).

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