AN ANALYSIS OF VOLTAGE SAGS IN 110-220 KV ELECTRIC NETWORKS

摘要

A procedure is proposed for calculating the factors characterizing the voltage sags due to short-circuit faults in 110 and 220 kV overhead power lines caused by thunderstorms. The effect the parameters of the protection and control systems have on the depth, duration and shape of the voltage sag for different distances of the fault location is indicated. Examples illustrating the use of these calculation to predict voltage sags in 10 kV networks are given.