The Influences Of TCSC On Protective Relayings For Transmission Line

Thyristor Controlled Series Compensation (TCSC) is an important member of the Flexible AC Transmission System (FACTS)'s family. It has many functions, such as tidal current controlling, damping power oscillation, improvement of transient state and suppressing subsynchronous resonance (SSR), so it's potencial is very great in electrical power system and it is primarily in the application of FACTS. Therefore, it is necessary to study the influences of TCSC and review the adaptation of TCSC on the existing relay protection. At first, the article researched the influences of Fixed Series Compensation (FSC) on protection for transmission line. Then, on the base of the analysis of characters of harmonic wave and the dynamic resistance of basic frequency of TCSC when the fault occurred, we researched the influences of TCSC on protection for transmission line. And then some of improvement advices have been proposed. At last , we discussed the digital simulation of TCSC on the base of controlling theory.