Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Power Transmission Lines Outage. Part 2

This is continuation of the paper “Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Transmission Lines Outage. Part 1” where on the example of 500 kV overhead power transmission line (OHL) have been considered residual voltages arising between switch’s open contacts for each phase under outage of 500 kV OHL operating in idle mode. In the present paper have been carried out studies of residual voltages arising between phases switches under outage of 500 kV OHL. Maximal values of these resulting voltages exceed a double amplitude value of the OHL nominal phase value, and that may be the reason for a breakdown of the air gap between the switches, damage of the switches, and the risk for the personnel during a substation walk around.