Abstract: One of the most serious problems in power system is voltage instability and losses. Improving the systems reactive power handling capacity via Flexible AC Transmission system (FACTS) devices is a remedy for prevention of voltage. This paper discusses the use of static var compensators (SVC) for reducing the total losses of a power system. National Grid of Sudan (NGS) transmission lines-500KV is used as case study. Solutions are obtained using Neplan software. The results show that the total losses is about 25.447 MW, which is reduced to 21.551 MW by installing static var compensator in main bus bar of kabashi.
Keywords: Voltage Instability, SVC, technical losses, FACTS.