Lightning protection supporting insulator and insulated cable used with it

Abstract

The invention relates to a lightning-proof post insulator and a matching insulated cable, wherein, the lightning-proof post insulator comprises an insulator body, an upper flange, a lower flange, a discharge ring, a run-on tab, a built-in clip and an insulating boot. The invention is characterized in that the built-in clip is arranged at the top of the upper flange via a bolt with a pressure spring, enabling the insulated cable to be tightly pressed between the bottom of the built-in clip and the upper flange, and arranged on the discharge ring via the insulating boot from a top boot; part of the insulated cable arranged on the post insulator is bare, two insulated adhesive tapes are arranged at two ends of the bare cable and an aluminum armor tape is arranged in the middle. The invention has the advantages that part of the insulated cable close to the insulator is bared according to lightening breaking mechanism to the insulated cable; an arc root of a power frequency electric arc is transferred or fixed between the electric arc and the run-on tab via the discharge ring on the upper flange and the run-on tab on the lower flange of the lightning-proof post insulator; the electric arc energy of lightening short circuit is transferred away from the cable in a short time, thereby preventing the insulated cable from being damaged by lightening and ensuring safe operation of overhead insulated distribution network.

Description

technical field [0001] The invention relates to a post insulator for overhead power distribution lines, in particular to a lightning protection post insulator and an insulated cable used in conjunction with it. Background technique [0002] In order to reduce the failure of overhead distribution lines caused by external factors such as trees, birds, and snow, and improve the reliability of power supply, the insulation rate of 10kV overhead distribution lines in large cities in my country has been quite high, and the insulation of 10kV overhead distribution lines has become a development trend. [0003] Insulated conductors solve the corridor and safety problems that bare conductors cannot solve. Compared with cables, they have obvious advantages of less investment and faster construction. However, problems such as lightning breakage and open connection between cables and overhead lines not only affect the safety of grid operation, but also seriously hinder the promotion of i...

AI Technical Summary

Problems solved by technology

The lightning overvoltage first breaks through the insulating layer of the wire and then causes the insulator to flashover. The punctured insulating layer is in the shape of a pinhole. The continuous power frequency short-circuit current arc is blocked by the surrounding insulation, and the arc root can only burn at the pinhole. , the wires will be burnt neatly in a very short period of time, and a lightning strike and power failure will occur, which seriously threatens the safe operation of the distribution network.

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