High temperature vulcanized (HTV) silicone rubber has excellent hydrophobicity properties such as hydrophobicity migration and hydrophobicity recovery, and is therefore widely used as insulation material in power systems. With the rapid development of ultra-high voltage AC and DC transmission projects in China, AC corona and DC corona have a significant impact on

The aging characteristics of silicone rubber insulators have gradually attracted the attention of researchers. As the service life of silicone rubber increases, it is more severely affected by corona aging, resulting in aging of the silicone rubber surface and a decrease in hydrophobicity, leading to flashover accidents.

There are significant differences in the discharge mechanisms between DC corona and AC corona, so different forms of corona discharge have significantly different effects on silicone rubber insulation materials. Therefore, in the field of high-voltage transmission in China, research is being conducted on the effects of different forms of corona discharge on silicone rubber insulation materials

The aging effect can provide important guarantees for the stable operation of power transmission.

The maximum output voltage of the DC power supply is 50 kV, and the maximum current is 4 mA. The maximum output voltage of the experimental AC power supply is 60 kV. The data acquisition system used is a real-time leakage current acquisition system based on Labview software.