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Reactive Power

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reactive power: see power, electric power, electric, energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some other form of energy such as light or heat.
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reactive power [rē′ak·tiv ′pau̇·ər]
(electricity)
The power value obtained by multiplying together the effective value of current in amperes, the effective value of voltage in volts, and the sine of the angular phase difference between current and voltage. Also known as wattless power.

Reactive Power 

the quantity that describes the load created in electric equipment by the energy oscillations of an electromagnetic field in an AC network. The reactive power Q is equal to the product of the operating value of the voltage U and the current I multiplied by the sine of the angle of the phase shift Φ between them: Q = UI sin Φ. It is measured in vars. Reactive power is related to the apparent power S and the active power P by the expression Reactive Power.

The reactive power consumed in electric circuits creates additional resistance losses, which are met by the expenditure of energy at power stations, and voltage losses, which degrade the voltage regulation conditions. In some electric installations, the reactive power may be substantially greater than the active power. This causes high reactive currents to develop and overloads the current sources. In order to avoid overloads and to improve the power factor of electric installations, the reactive power is compensated.



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It discovers that when the machine terminal voltage is in the condition of constant, there exist certain relations among active power, reactive power and field current.
Similarly, SCADA systems, reactive power compensation and feeder automation are all being used to reduce "line losses" for greater efficiency.
Other advantages of the ABB industrial drive include operation at unity power factor, allowing reactive power charges to be avoided.
 
 
 
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