Anti-windage yaw jumper arrester for 500kV power transmission line

Abstract

The invention discloses an anti-windage yaw jumper arrester for a 500kV power transmission line, which comprises an arrester body I, an arrester body II and a discharge gap assembly, the arrester body I and the arrester body II have the same specification, and the ends, close to each other, of the arrester body I and the arrester body II are connected; the arrester body II is connected with the ends, close to each other, of the discharge gap assemblies, a resistor disc column is arranged on the inner side of the arrester body I, an epoxy glass fiber winding pipe is arranged on the outer side of the resistor disc column, and the gap between the resistor disc column and the epoxy glass fiber winding pipe is filled with silicon rubber. A lightning arrester silicon rubber umbrella cover is arranged on the outer side of the epoxy glass fiber winding pipe. The windage yaw prevention jumper wire lightning arrester for the 500kV power transmission line is high in insulation sealing performance and safety, can effectively avoid windage yaw of a drainage jumper wire, integrates the functions of a jumper wire string, a heavy hammer sheet, a V-shaped insulator string and a conventional line lightning arrester, is low in installation and construction difficulty, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of high-voltage AC arresters, in particular to a wind deflection jumper arrester for 500kV transmission lines. Background technique [0002] The 500kV AC transmission line is the backbone network of power transmission in my country and an important channel for the interconnection of large power systems across provinces and regions. However, the tripping accidents caused by the insulation flashover of the diversion jumper of the 500kV AC transmission line occur frequently, which has a great impact on the safe operation of the transmission line, especially under the severe weather conditions of strong winds and thunderstorms, the tripping caused by the insulation flashover discharge Accidents are particularly serious. [0003] According to statistics, in 2018, there were more than 100 wind deflection flashover tripping accidents on transmission lines of 500kV and above under the jurisdiction of the State Grid...

AI Technical Summary

Problems solved by technology

[0006] 2. The wind deflection check was not carried out after the composite insulator was used for line adjustment and climbing. Because the composite insulator has a relatively light weight, even if the heavy hammer swings a lot when the wind deflects, it will also cause flashover discharge in the air gap

Therefore, the installation of windproof guy wires still poses a relatively large safety hazard to the line operation;

[0009] 2. Adding a heavy hammer: The effect of adding a heavy hammer is limited, and it cannot fundamentally solve the problem of hanging string wind deflection flashover;

[0010] 3. Use wind deflection insulators: the wind deflection insulator has a small swing range, which increases the electrical gap between the conductor and the tower and is reliable for installation. However, for lines with 500kV and above, due to the large insulation size, the conductor wind dance is more serious;

[0011] 4. Adjusting the creepage distance of jumper insulators and reducing the grounding resistance of towers are traditional measures to reduce the lightning tripping rate of transmission lines, but they still cannot effectively solve the tripping accidents caused by flashover discharges caused by wind deviation of diversion jumpers;

[0012] 5. Installing a conventional line arrester with series gap at the diversion jumper can reduce lightning overvoltage, but it cannot suppress the wind deflection of the diversion jumper. Insulation flashover will occur under lightning overvoltage, operating overvoltage or even working voltage ACCIDENT;

The jumper strings of 500kV transmission lines at home and abroad generally adopt the assembly method of vertical suspension or hanging heavy hammers, which cannot fundamentally solve the problem of wind deflection flashover of jumpers;

[0014] 7. It is possible to use the V-shaped jumper string assembly method in coastal areas with strong winds. Because it needs to add an insulator, and the cross-arm of the jumper also needs to be lengthened, which will increase the investment, construction and maintenance costs.

[0015] To sum up, the measures to prevent the insulation flashover discharge of the 500kV AC transmission line diversion jumper include reducing resistance, increasing creepage, wind deflection insulators and heavy hammers, and installing conventional line arresters, etc., which still cannot effectively solve the problem of diversion jumper insulation. Trip Accident Caused by Flashover Discharge

Among them, if the measure of installing wind deflection insulators and line arresters at the same time is adopted, it will face the problems of difficult implementation and high construction and maintenance costs

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