Method, device and equipment for determining discharge path control parameters of insulator

Abstract

The invention discloses a method, device and equipment for determining discharge path control parameters of an insulator, and the method comprises the steps: determining the numerical range of a discharge gap of the insulator according to a positive 50% lightning impulse discharge voltage and a power frequency wet withstand voltage; determining the voltage range of the internal insulation and thevoltage range of the external insulation according to the lightning impulse discharge voltage range and the power frequency dry withstand voltage range corresponding to the numerical range of the discharge gap; determining internal insulation distance of the insulation section and external insulation distance of the insulation section; and determining the numerical range of the discharge gap, theexternal insulation distance of the insulation section and the external insulation distance of the insulation section as the discharge path control parameters of the insulator. According to the application, the discharge path control parameters of the insulator are determined, so that the insulator designed based on the discharge path control parameters does not discharge along the internal insulation but discharges along the discharge gap under the conditions of lightning stroke and the like, and the risk of ablation of the insulating layer of the insulator under the lightning stroke is reduced.

Description

technical field [0001] The present application relates to the technical field of electrical engineering, in particular to a method, device and equipment for determining control parameters of an insulator's discharge path. Background technique [0002] Distribution network lines are the last mile of power transportation, and reliability is very important. In recent years, extreme weather has occurred frequently, the insulation distance of distribution network insulators is short, and there is no lightning protection function. Under thunderstorm and ice-covered conditions, distribution network insulators are prone to breakdown, resulting in line tripping and affecting normal production and domestic electricity consumption. At present, in order to solve the line trip phenomenon caused by tree branches contacting wires, etc., a large number of insulator overhead wires are used in the distribution network. Under the lightning strike, the overhead wire of the insulator is bound b...

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Problems solved by technology

[0003] At present, the relevant technology adopts the integrated lightning protection and insulation insulator containing zinc oxide resistors inside to protect the line from lightning strikes, but there are the following problems: the arc movement is irregular under lightning strikes, and breakdown occurs first at the weakest position of the insulation under high voltage , once the discharge occurs inside the insulator, the internal insulation is severely ablated, and the insulation performance cannot be restored, which directly leads to the destruction of the insulator

Under polluted conditions, the flashover voltage of the insulator along the surface drops significantly. Once the lightning arc breaks down along the surface, the arc cannot be reliably extinguished, resulting in a lightning trip or even a lightning strike disconnection

The arc flowing through the silicone rubber shed will also cause the ablation of the shed, and the voltage along the surface will drop significantly, which will affect the insulation performance of the line

The moving arc root and arc column may ablate the large shed structure, thus affecting the external insulation performance of the insulator

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