Under which condition voltage regulation of transformer is negative?
Explanation: The sign -ve arises in the voltage regulation calculations when, the load connected to the transformer is leading in the nature. The only condition when we’ll get negative voltage regulation when second term is higher than first term. 6.
When can the voltage regulation of an alternator be negative and why?
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.
Why the voltage regulation is negative in case of capacitive load?
There is a drop in voltage from no load to full load. The leading current is provided by the Capacitor. The value of voltage regulation may be negative if the leading angle and sin angle are increased.
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 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.
Which of the following voltage regulation may be zero or negative?
Voltage regulation is zero or negative value on the leading power factor load or capacitive load as the voltage rises due to increase in load. 03․ For which of the following loads, armature reaction is magnetizing in nature?
Why is voltage regulation important?
The purpose of a voltage regulator is to keep the voltage in a circuit relatively close to a desired value. Voltage regulators are one of the most common electronic components, since a power supply frequently produces raw current that would otherwise damage one of the components in the circuit.
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 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.
Why should voltage regulation be low?
Voltage regulation is the measure of how well a power transformer can maintain constant secondary voltage given a constant primary voltage and wide variance in load current. The lower the percentage (closer to zero), the more stable the secondary voltage and the better the regulation it will provide.
What difference is observed between resistive and capacitive load voltage regulation?
These curves showed that under resistive or inductive loading conditions, the secondary voltage decreases as the load increases, and that under capacitive loading conditions, the secondary voltage can rise above its nominal value.