Current Density at Different Parts of Insulator Surface
- 發(fā)布時(shí)間：
- 2019-03-15 10:47:00
摘要：It has good anti-pollution performance, good anti-pollution performance and strong anti-pollution flashover Its wet
It has good anti-pollution performance, good anti-pollution performance and strong anti-pollution flashover. Its wet and pollution tolerance voltage is 2-2.5 times higher than that of ceramic insulators with the same climbing distance.
Without cleaning, it can operate safely in heavy pollution. Small size, light weight of high-voltage wall-piercing bushing (only 1/6~1/9 of porcelain insulators of the same voltage grade). Light structure, easy to transport and install. Silicone rubber umbrella skirt has good hydrophobicity. Its integral structure ensures that the internal insulation is not damp. It does not need to carry out preventive insulation monitoring test and cleaning, thus reducing the daily maintenance workload. When the disconnector is in the disconnection position, the angle or distance between the contacts does not meet the requirements, the high voltage insulator should be adjusted by the tie rod insulator. Vaseline can be applied between contacts to reduce friction resistance, prolong service life and prevent contact oxidation.
The current density of each part of the insulator surface is different. As a result, a drying zone is formed in the part with high current density. The formation of the drying zone makes the voltage distribution on the insulator surface more uneven, and the drying zone withstands a higher voltage. When the electric field intensity is large enough, the high-voltage disconnector will produce glow discharge, which will lead to local arc. Arc may be extinguished or developed. When the local arc occurs and develops continuously and reaches or exceeds the critical state, the arc runs through the two poles and produces flashover.