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Date：07-08-2022
A lot of disc-shaped insulators are hung at one end of the high-voltage wire connection tower. It is to increase the creepage distance. It is usually made of glass or ceramics, which is called an insulator. In order to prevent dust and other contaminants from adhering to the surface of the insulator, forming a path that is broken down by the voltage across the insulator, that is, creepage, so increase the surface distance, that is, creeping distance. The distance of discharge along the insulating surface, that is, the leakage distance, is called creeping distance. Surface distance/system maximum voltage, according to the degree of pollution, the creepage distance is generally 31 mm/kV in heavily polluted areas.
A zero-value insulator refers to an insulator whose potential distribution across the insulator is close to or equal to zero during operation.
Influence of zero-value or low-value insulators: The insulation of line wires depends on the insulator string. Due to manufacturing defects or external effects, the insulation performance of insulators will continue to deteriorate. When the insulation and insulation resistance is reduced or zero, it is called low-value or zero. Zero-value insulators, we have tested the line, and the proportion of zero-value or low-value insulators is as high as about 9%, which is another main reason for the high lightning strike rate of the company’s lines. The capacitive reactance between them can reduce the loss of current.
