What is Reactor:
A reactor is a coil which has large number of turns and whose ohmic resistance value is much greater. Reactors are used to limit the short circuit currents which can cause damage to the equipment’s of the power system. The additional reactance added in series with the system for protection, are called reactors.
A current limiting reactor is a type of reactor which limits the heavy flow of current through other sections of the system. In this way, we don’t have to shut down the whole system, we can just isolate the faulty section.
Reactors are also used to protect the circuit breakers of different ratings. They are used to limit the short circuit currents according to the capacity of circuit breakers. Therefore while doing changes in the system, we don’t have to replace the circuit breakers, instead we can add reactors and utilize the same circuit breaker, due to which, time and money, both can be saved.
Uses of Reactor:
- For arc suppression.
- To filter out harmonics.
- In series with low reactance auto transformers.
- In series with low reactance induction regulators.
- To protect from high voltage waves, surges and lightning.
- To control starting currents of motors.
Types of Reactor:
- Shunt Reactor
- Current Limiting and Neutral Earthing Reactor
- Damping Reactor
- Tuning Reactor
- Earthing Transformer
- Arc Suppression Reactor
- Smoothing Reactor etc.
From constructional point of view the reactors re classified as
- Air Core Reactor
- Gapped Iron Core Reactor
From operational point of view they can be classified as
- Variable Reactor
- Fixed Reactor.
In addition to these the reactor can also be classified as
- Indoor Type or
- Outdoor Type Reactor