Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

compensator
a system block added to an existing system (or process) to produce a combined transfer function that improves its performance when connected in a closed loop configuration. See also compensation, pre-compensator and post-compensator.
line drop compensator
a multiply-tapped autotransformer equipped with a load-sensing relay which will adjust the line voltage to compensate for the impedance drop in the circuit between the device and the load center.
static var compensator
a device for fast reactive compensation, either inductive or capacitive, brought about by thyristor-based control of an effective shunt susceptance. It is typically used to regulate voltage at a bus on the high voltage transmission system.
thyristor-controlled series compensator
a capacitor bank installed in series with an electric power transmission line in which each capacitor is placed in parallel with a thyristor device. Each capacitor may thus be switched in or out of the line for some variable portion of the AC cycle so as to maintain the line's maximum power-carrying ability under varying load conditions.
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