Var compensators are used to

(A) increase the active power transmission capacity of a line

(B) increase the reactive power transmission capacity of a line

(C) both (A) and (B)

(D) none of these


Answer: (A) increase the active power transmission capacity of a line


Explanation:

Var compensators:



A static VAR compensator (SVC) is a set of electrical devices for providing fast-acting reactive power on high-voltage electricity transmission networks. It increases the active power transmission capacity of a line.

Advantages:

It increases the power transmission capability of the transmission lines.

It improves the transient stability of the system.

It controls the steady-state and temporary overvoltages.

It improves the load power factor, and therefore, reduced line losses and improved system capability.

 

The most commonly used SVC scheme are as follows.

Thyristor controlled reactor (TCR)

Thyristor-switched capacitor (TSC)

Self Reactor (SR)

Thyristor controlled reactor – Fixed capacitor (TCR-FC)

Thyristor-switched capacitor – Thyristor controlled reactor (TSC-TCR)


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