Discharge characteristics of insulators

Under power frequency voltage, operating overvoltage and lightning overvoltage, the discharge characteristics of insulators are different. For insulation coordination under power frequency voltage, only creepage distance is usually required to meet the requirements. After all, the power frequency voltage is applied to the insulator for a long time. The discharge characteristics of operating overvoltage and lightning overvoltage are mainly affected by the length of insulator string. Among them, the operating overvoltage is the internal overvoltage, so the influence of the tower height is not considered, while the lightning overvoltage is the external overvoltage, and the tower height must be considered. In addition, the overvoltage waveform of the operating overvoltage is closer to the waveform of the power frequency voltage. Therefore, zero value insulator will affect its discharge characteristics. Therefore, when calculating the tension insulator under operating overvoltage, it must be considered more than the suspension insulator string. Number of zero value insulators; Since the discharge time is extremely short, the effective string length is mainly considered for lightning overvoltage, and the zero value insulator will not reduce the effective string length of the insulator string. Therefore, it is unnecessary to consider increasing the zero value when conducting insulation coordination for lightning overvoltage. Insulator. No matter whether it is power frequency voltage, operating overvoltage and lightning overvoltage, the deionization characteristics of insulator surface will become worse due to the influence of air density after the altitude rises, so the altitude must be corrected.

The above is the discharge characteristics of insulators. If you have any other questions, please contact us!