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The thyristor is a four-layered, three-terminal semiconductor device, with each layer consisting of alternating N-type or P-type material, for example P-N-P-N. The main terminals, labelled anode and cathode, are across all four layers. The control terminal, called the gate, is attached to p-type material near the cathode.
Controlled three-phase full-wave rectifier circuit using thyristors as the switching elements, with a center-tapped transformer, ignoring supply inductance. If the AC supply is fed via a transformer with a center tap, a rectifier circuit with improved harmonic performance can be obtained.
A thyristor controlled reactor is usually a three-phase assembly, normally connected in a delta arrangement to provide partial cancellation of harmonics. Often the main TCR reactor is split into two halves, with the thyristor valve connected between the two halves. This protects the vulnerable thyristor valve from damage due to flashovers ...
In Electrical Engineering , a static synchronous compensator (STATCOM) is a shunt-connected, reactive compensation device used on transmission networks. It uses power electronics to form a voltage-source converter that can act as either a source or sink of reactive AC power to an electricity network. It is a member of the FACTS family of devices.
Zero-crossing control (or burst-fire control) is an approach for electrical control circuits that starts operation with the AC load voltage at close to 0 volts in the AC cycle. [1] This is in relation to solid-state relays, such as TRIACs and silicon controlled rectifiers. [1] The purpose of the circuit is to start the TRIAC conducting very ...
Thyristor-switched capacitor (TSC) Harmonic filter(s) Mechanically switched capacitors or reactors (switched by a circuit breaker) One-line diagram of a typical SVC configuration; here employing a thyristor-controlled reactor, a thyristor-switched capacitor, a harmonic filter, a mechanically switched capacitor and a mechanically switched reactor
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