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

What is the effect on voltage regulation of an alternator of leading power factor?

Effect of power factor on voltage regulation:

The leading power factor reduces voltage regulation value and improves system performance.

How is power factor related to voltage regulation?

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 factors affect the voltage regulation of an alternator?

The factors are the speed of the alternator, the quality of connections, the condition of the battery and the system load. Speed and power factor are important for AC power generation.

Why is voltage regulation important in alternator?

A knowledge of voltage regulation at different power factors are usually essential because it shows how closely a machine will maintain its voltage under the various conditions of load. This knowledge is also important from the point of voltage control, parallel operation and protection of the alternators.

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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 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.

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).

When the load power factor is leading voltage regulation of line is?

Explanation: At leading power factor the voltage regulation can be negative or zero.

When can the voltage regulation of an alternator be negative?

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.

At which power factor condition the regulation of the alternator can be zero Why?

Due to this, a purely inductive load gets connected to an alternator through an ammeter. A purely inductive load has a power factor of cos 90° i.e. zero lagging hence the test is called zero power factor test. The machine speed is maintained constant at its synchronous value.

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