What does it mean if reactive power is negative?

Negative reactive power generated means that reactive power is flowing from the utility grid (source) to the generator. This occurs whenever the generator field is under-excited or if an induction generator is being used.

What causes negative KVARs?

Inductive loads draw KVARs. Capacitive loads supply KVARs, or vice-versa if you prefer. The point is, if you have more capacitive reactance than inductive reactance, your meter will show negative KVARs.

Why the regulation of transformer is negative for 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.

What happens when current flows in the secondary of a transformer?

When an electrical load is connected across the secondary winding of a transformer, current flows through the secondary and the load. The magnetic field produced by the current in the secondary interacts with the magnetic field produced by the current in the Page 16 primary.

What is the reactive power Q?

Reactive power (Q), (sometimes called wattless power) is the power consumed in an AC circuit that does not perform any useful work but has a big effect on the phase shift between the voltage and current waveforms. The result is that capacitors “generate” reactive power and inductors “consume” reactive power.

What is the reason for reactive power?

Why Do We Need Reactive Power? Reactive power (VARS) is required to maintain the voltage to deliver active power (watts) through transmission lines. Motor loads and other loads require reactive power to convert the flow of electrons into useful work.

What does negative MVAR mean?

When MVArs are negative, per GE’s convention, it means that leading reactive current is flowing in the generator stator windings. This can cause unwanted heat generation in parts of the generator which can lead to premature failure of generator insulation.

What is the condition for negative voltage regulation in transformer?

Yes,the voltage Regulation of a transformer can be negative. It happens when the recieving end voltage is greater than the No load voltage,it occurs due to the capacitive nature of transmission line.

For which type of load regulation of transformer is negative?

Negative voltage regulation can only occur with leading power factor loads; however, not all leading loads will cause negative voltage regulation. Negative voltage regulation means the voltage increases with the load. This is a very undesirable condition because it can lead to an unstable condition.

Does a transformer take any current when the secondary circuit is open and why?

Does the transformer draw any current when its secondary is open? – Quora. Yes, Indeed . Whenever a transformer is on no load,i.e the secondary winding has no burden(load) connected to it…the transformer must actually withdraw zero current from the primary side….

What is the reactive power of a power transformer?

This is due to the reactive power requirement of two separate branches of the transformer namely: The reactive power drawn by power transformer could be as high as 5\% of the transformer rating when supplying full load current.

What is the series leakage reactance of a transformer?

The series leakage reactance (also known as \%impedance) is an important transformer parameter that determines the short circuit contribution, voltage regulation etc. The reactive power demand due to the series leakage reactance varies as the square of the load current.

What is the power factor at the primary of transformer?

Power factor at the primary of the transformer is usually lower than what is measured at the secondary due to this reactive power requirement of transformer. If the metering is done at medium voltage then the additional reactive power consumed by the transformer will also be measured.

What happens when the voltage of a transformer is doubled?

Explanation: A transformer is an electrical device used to step- up or step-down voltage with constant power. Therefore, a change in voltage level causes a change in current. It means, if the voltage is doubled, the current will be halved. i.e., V = 0.5 I