Residual Voltage Tests of 4.5 kV Metal Oxide Surge Arrester

Overvoltages can cause various malfunctions in electrical power systems and high voltage facilities. Metal oxide surge arresters (MOSAs) are used to prevent overvoltage-related malfunctions in electrical power systems and high voltage facilities. MOSAs protect the system from high amplitude currents by conducting overvoltage-induced discharge currents through themselves to ground in the network to which they are connected. Residual voltage tests of MOSAs are carried out with lightning impulse current in 8/20 µs waveform according to IEC 60099-4 standards. In this study, residual voltage tests of a 4.5 kV metal oxide surge arrester (MOSA) were carried out by producing 2.5 kA, 5 kA and 10 kA impulse currents with an impulse current generator (ICG) with 24 kV and 2.9 kJ label values. As a result of the experiments carried out according to IEC 60099-4 standards, it was concluded that the residual voltage of the MOSA is within the limits guaranteed by the manufacturer.