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Reactive power is power created by inductive or capacitive elements in AC systems. A long power transmission line is effectively a wire at a voltage some distance away from ground. A simple capacitor is the same thing - a metal plate, with an air gap between the electrodes. Thus an energized power line can be drawn as a big capacitor in parallel with a resistor which is in series with an inductor (the transmission line has natural resistance and inductance). When it is lightly loaded, the capacitance of this line will supply reactive power to the system, causing the voltage to increase. When more power flows down the line, the inductance of the line will "use" this reactive power and cause the voltage to decrease.
In short, capacitors make reactive power, and inductors dissipate it. Generators also can create or consume reactive power.
Answer'Reactive power' describes the behaviour of part of the energy supplied to a circuit from an a.c. source, and is the rate at which that energy is alternately stored, then released, within a magnetic or electric field. Unlike 'true power' (which describes the rate at which is permanently lost by doing work or through heat transfer) there is no net loss of energy from the supply due to reactive power. To quote one textbook, 'reactive power represents the rate at which energy sloshes back and forth between the source and the load each quarter-cycle'.
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Do reactive component of impedance dissipate power?
The reactive part dissipates no power because in a reactor the current is 90 degrees out of phase with the voltage. The effect of this is that any power that leaves the generator on one quarter-cycle comes back to the generator on the next. The net power is zero.
Why reactive power is named as reactive?
Actually reactive power is a power which flows in between load to source which is a reactive action of the power given from source to load.the given power to load will not be utilised fully.some power will be oscillating from load to source.this is called reactive power.
What happens to reactive power in a circuit that has both inductance and capacitance?
Inductors are considered to be a load for reactive power, meaning that they will draw reactive power from the system. Capacitors are considered to be sourced of reactive power, they feed reactive power into the system. If you have a circuit that is at unity (balanced with inductors and capacitors) no reactive power will be drawn from the source. You will have unity power factor. If your circuit is more inductive than capacitive it will be drawing reactive power from the source. The opposite is also true for capacitors.
Why wattmeter measure the reactive power?
A watt meter will measure active power, not reactive power.
Which line requires compensation?
Basically an AC transmission line require compensation in terms of reactive power. To push the active power across a transmission line certain amount of reactive power is necessary. In AC transmission line reactive power is generated and consumed. Generator is responsible for the production of reactive and active power both. Than this reactive power is consumed by the load and transmission line. Additional reactive power s supplied by the capacitor. This extra power supplied by the capacitor is termed as reactive power compensation. Requirement of this reactive power is there because reactive power is necessary to maintain the voltage stability.
How can you reduce reactive power?
If, for example, the reactive power of a load is due to its inductance, then installing a capacitor in parallel with the load will reduce the overall reactive power.
Which excitation synchronous motor drawn reactive power?
Hi, Under excitation - inductive reactive power Over excitation - Capacitive reactive power.
Is that the reactive power is a combination of both reactive power and imaginary power?
No. It is apparent power (expressed in volt amperes) that is the combination (vector sum) of true power (expressed in watts) and reactive power (expressed in reactive volt amperes). 'Imaginary power' is simply another name for 'reactive power' -where 'imaginary' is simply mathematicians-speak for 'quadrature' or 'right angles'.
Is reactive power a vector or scalar?
I am not sure what exactly you mean by "reactive power" (I guess you mean electrical reactive power), but power is the ratio of energy for a period of time. So that makes power (and reactive power as well) a scalar, since you can describe it with only one number. The fact that electrical reactive power is drawn on a XY plane, should not confuse you.
Is reactive power greater than true power?
Use a wattmeter, as it only reads 'real power' of your load. Use an ammeter and a voltmeter, and the product of the two readings will give you 'apparent power' of your load. Since apparent power is the vector sum of real power and reactive power, use the following equation to find the reactive power of your load: (reactive power)2 = (apparent power)2 - (real power)2
What is the power factor of AC generator when the reactive power is equal to zero?
Per factor is 1 when reactive power is zero.
What is the role of reactive power in a power system?
To supply the reactive power demand of load and to regulate of output volage at the grid
