Thyristor controlled reactor
Encyclopedia
A thyristor-controlled reactor (TCR) is a reactance
, which is connected in series with a bidirectional thyristor
valve. The thyristor-controlled reactor is an important component of a Static VAr Compensator
.
The thyristor valve is phase-controlled.
In parallel with the circuit consisting of the series connection of the reactance and the thyristor valve, there may be an opposite reactance, usually consisting of a permanently connected, mechanically switched or thyristor switched capacitor.
By phase-controlled switching of the thyristor valve, the value of delivered reactive power can be set. Thyristor-controlled reactors can also be used for limiting voltage rises when circuits are open. Another device used for this purpose is a transducer, magnetically controlled reactor (MCR)
Reactance
Reactance is the opposition of a circuit element to a change of electric current or voltage, due to that element's capacitance or inductance. A built-up electric field resists the change of voltage on the element, while a magnetic field resists the change of current...
, which is connected in series with a bidirectional thyristor
Thyristor
A thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act as bistable switches, conducting when their gate receives a current trigger, and continue to conduct while they are forward biased .Some sources define silicon controlled rectifiers and...
valve. The thyristor-controlled reactor is an important component of a Static VAr Compensator
Static VAr compensator
A static var compensator is an electrical device for providing fast-acting reactive power on high-voltage electricity transmission networks. SVCs are part of the Flexible AC transmission system device family, regulating voltage and stabilising the system...
.
The thyristor valve is phase-controlled.
In parallel with the circuit consisting of the series connection of the reactance and the thyristor valve, there may be an opposite reactance, usually consisting of a permanently connected, mechanically switched or thyristor switched capacitor.
By phase-controlled switching of the thyristor valve, the value of delivered reactive power can be set. Thyristor-controlled reactors can also be used for limiting voltage rises when circuits are open. Another device used for this purpose is a transducer, magnetically controlled reactor (MCR)