Reactors
Shunt Reactor
Shunt Reactors are intended for connecting phase to earth, phase to neutral, or between phases in a power system to compensate for capacitive currents.
The absorbed reactive power at rated voltage can be fixed or adjustable by :
- Phase controlled switching by power electronic device (such as SVC)
- DC magnetization of iron core
- Winding taps “on load” or “off load” settings
Transmission cables have much higher capacitance to earth than overhead lines. Long submarine cables for system carry voltages of 100 kV and more need shunt reactors.
The same goes for large urban networks to prevent excessive voltage rise when a high load suddenly falls out due to a failure.
The neutral of shunt reactor may be directly earthed, earthed through an earthing-reactor, or be unearthed.
