Composite insulating cross arm

Abstract

The invention discloses a composite insulating cross arm comprising a mandrel. The mandrel is of a cylindrical structure, and a rubber sheath is arranged on the outer surface of the mandrel. The two ends of the mandrel are provided with cylinder clamps connected in a pressed mode. One ends of the cylinder clamps are provided with cavities which are connected with the mandrel in matched and sleevedmodes, and the other ends of the cylinder clamps are closed. The side wall of the closed end of one of the cylinder clamps is provided with a first connecting fitting fixedly connected with the cylinder clamp, an oval through hole is formed in the middle of the first connecting fitting, an arc-shaped groove is formed in the middle of the top end of the first connecting fitting, convex lugs are arranged on the two sides of the top of the first connecting fitting, and the side wall of one of the convex lugs is fixedly connected with the corresponding cylinder clamp. The side wall of the closedend of the other cylinder clamp is fixedly connected with one end of a second connecting fitting which is overall in an sunken arc-shaped cylinder shape, the other end of the second connecting fittingis provided with symmetrical arc-shaped convex lugs, and the side wall of the second connecting fitting is provided with a locking assembly fixedly connected with the second connecting fitting.

Description

technical field [0001] The invention belongs to the field of power grid equipment; in particular, it relates to a composite insulating cross arm. Background technique [0002] According to the research results, the lightning flashover depends on the overvoltage value and the line insulation level. The research shows that the severity of the arc caused by the lightning strike decreases with the decrease of the electric field gradient along the flashover path; so improving the line insulation level and increasing the power The insulation performance of the pole tower can significantly improve the lightning flashover; at present, most power pole towers in domestic and foreign distribution network systems have iron cross arms, wooden cross arms, and porcelain cross arms; the wooden cross arms are not strong enough and have weak corrosion resistance; Porcelain cross-arms are not strong enough and have insufficient bending resistance; iron cross-arms have poor insulation performan...

AI Technical Summary

Problems solved by technology

[0002] According to the research results, the lightning flashover depends on the overvoltage value and the line insulation level. The research shows that the severity of the arc caused by the lightning strike decreases with the decrease of the electric field gradient along the flashover path; so improving the line insulation level and increasing the power The insulation performance of the pole tower can significantly improve the lightning flashover; at present, most power pole towers in domestic and foreign distribution network systems have iron cross arms, wooden cross arms, and porcelain cross arms; the wooden cross arms are not strong enough and have weak corrosion resistance; Porcelain cross-arms are not strong enough and have insufficient bending resistance; iron cross-arms have poor insulation performance and are prone to rust; and the insulating cross-arms in the prior art need to be loosened and moved down to Only then can the new insulating cross-arm be installed. It needs to be fixed by metal hinges during installation, and the installation process is complicated and requires the cooperation of two people. After installation, the wires on the original insulating cross-arm need to be turned up to Insulated cross arm; during the operation, the staff touches the live wire many times, there are many dangerous points, and the labor intensity is high, which is not conducive to safe work

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