Insulation tower head for power distribution network overhead line

Abstract

The invention discloses an insulation tower head used for a distribution network overhead line, relating to the field of distribution network overhead line lightning overvoltage protection; wherein, the insulation tower head comprises an insulation pillar which is used for single-circuit or same-rod multi-circuit line. The insulation tower head also comprises a cross arm insulator or a cross arm and a pin-typed / pillar insulator; wherein, an overhead lead is fixed at one end of the cross arm insulator or on the pin-typed / pillar insulator at the end of the cross arm; the other end of the downmost cross arm or the middle part of the cross arm is fixed at the upper end of the insulation pillar; the lower end of the insulation pillar is fixed on the top of a power pole. According to the practical requirement of the system, the insulation pillar, the composite / ceramic cross arm insulator, the insulation / metal cross arm and the pin-typed / pillar insulator can be combined for usage to form the insulation tower head with a plurality of structure types, thus greatly improving the insulation level of the line and effectively preventing the accidents of line trip, insulator damage and insulation lead breakdown, etc. which are caused by lightning induction overvoltage of overhead line.

Description

technical field [0001] The invention relates to the field of lightning overvoltage protection for overhead lines of a distribution network, and more particularly relates to an insulating tower head for an overhead line of a distribution network. Background technique [0002] The vertical distance between the conductor of the overhead line of the distribution network and the ground is relatively low, and the lightning protection is mainly based on the induction lightning. For overhead bare conductor lines, after the lightning overvoltage causes insulator flashover, the continuous power frequency freewheeling arc will often ablate the glaze layer on the surface of the insulator, which may cause the umbrella group to burst in severe cases; for overhead insulated conductor lines, lightning overvoltage will cause conductor After the insulating layer and the insulator break down and flashover, the arc root of the continuous power frequency freewheeling arc is subjected to the anti...

AI Technical Summary

Problems solved by technology

The protection gap improves the probability of successful line reclosing, but the disadvantage is that it does not have arc extinguishing ability

The lightning arrester utilizes the non-linear characteristics of metal oxide resistors to absorb lightning energy, suppress power-frequency continuous current arcing, protect insulators or insulated wires from lightning damage, and at the same time prevent lightning tripping of lines. It is an ideal lightning protection measure , the disadvantage is that the cost is high, and regular maintenance is required during operation

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