Importance of Reactive Power


Importance of Reactive Power

Importance of Reactive Power both the problem and importance to the power system network for several reasons.

  • It plays an important role in the electrical power system for various functions such as satisfying the reactive power requirement, improving the voltage, Reduce the network loss, provide system security in emergencies, and other functions.
  • Let us discuss some of the reasons in brief, which makes Importants of Reactive Power
  • Reactive power consumes transmission line and generation station resources.
  • The main Importance of Reactive Power To increase the value of real power that can be transfer  across a congested transmission interface, reactive power flows can be minimized. Similarly, reactive-power production can limit a generator’s real-power capability.
  • Moving reactive power on the transmission system incurs real-power losses. Both capacity and energy must be supplied to replace these losses.

To generate magnetic flux 

  • Inductive loads such as motors, transformers, ballasts and induction heating equipments require reactive power in order to produce a magnetic field.
  • In every electrical machine, a part of input energy, i.e., reactive power is consumed for creating and maintaining magnetic flux to do so. However, it leads to lower the power factor.
  • To achieve the high power factor, capacitors are generally connected across these devices to supply the reactive power.

To Reduce effect of electrical Blackouts

  • Inadequate reactive power in electrical power system network has been a major reason in power outages in worldwide.
  • As discussed, insufficient quantity of reactive power causes voltage collapse that ultimately leads to the shutdown of generating stations and various equipments.


Voltage control

  • If the load on power system source increases, the voltage drop in power system components increases thereby voltage at the consumer terminals decreases, and vice-versa.
  • These voltage changes on the supply system is undesirable as it deviates the actual performance of the equipments at the consumer end such as lamps, motors and other equipments sensitive to voltage variations.

voltage control by reactive power

  • A power system must be designed as to maintain  voltage variations by providing voltage control equipment at suitable area.
  • The most common method of maintaining the voltage profile is through injecting and absorbing reactive power. In general, increasing reactive power causes the system voltage to rise while decreasing reactive power causes voltage to fall.
  • The voltage control equipment is placed at minimum two places in the power system network due to there will be different voltage drops in different part of distribution and transmission systems.


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