SVC for voltage control and improvement of stability To improve the voltage control and stability on the Central Southern 115 kV tie line the Electricity Generating Authority of Thailand (EGAT) is operating a Static Var Compensator (SVC) at Chumphon Substation. This SVC was supplied by ABB and has been in operation since 1987. The dynamic operating range is from 60 Mvar capacitive to 20 Mvar inductive. The SVC is an addition at the Chumphon

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