Reactive Power

Apr 28 • Engineering Notes • 1083 Views • 5 Comments on Reactive Power

AC connected devices that store energy in the form of a magnetic field include inductive devices called reactors, which consist of a large coil of wire. When a voltage is initially placed across the coil, a magnetic field builds up, and it takes a period of time for the current to reach full value. This causes the current to lag behind the voltage in phase; hence, these devices are said to absorb reactive power.

A capacitor is an AC device that stores energy in the form of an electric field. When current is driven through the capacitor, it takes a period of time for a charge to build up to produce the full voltage difference. On an AC network, the voltage across a capacitor is constantly changing – the capacitor will oppose this change, causing the voltage to lag behind the current. In other words, the current leads the voltage in phase; hence, these devices are said to generate reactive power.

Energy stored in capacitive or inductive elements of the network give rise to reactive power flow. Reactive power flow strongly influences the voltage levels across the network. Voltage levels and reactive power flow must be carefully controlled to allow a power system to be operated within acceptable limits.

RELATED QUESTIONS AND ANSWERS

1.DEFINE REACTIVE POWER AND EXPLAIN IT.

 ANS.AC connected devices that store energy in the form of a magnetic field include inductive devices called reactors, which consist of a large coil of wire. When a voltage is initially placed across the coil, a magnetic field builds up, and it takes a period of time for the current to reach full value. This causes the current to lag behind the voltage in phase; hence, these devices are said to absorb reactive power.

2.EXPLAIN MATHEMATICALLY THE TERMS ACTIVE POWER,REACTIVE POWER AND APPARENT POWER

 

complete description of reactive power,active power and apparent power
complete description of reactive power,active power and apparent power

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5 Responses to Reactive Power

  1. Ritika says:

    The concept of reactive power is a prominent term for alternating current systems. The calculation for reactive power is different from active power as it also involves a cosine term.
    This article also picks on the point as of why reactive power is calculated.

  2. Payal Das says:

    a nice article for reference and understanding 🙂

  3. Reactive power is explained in excellent manner.

  4. Dinesh says:

    very useful reference for anybody those who prepare for public exams

  5. important notes of reactive power with most asked question and solution is given..

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