An EHV/UHV AC Composite Insulator Umbrella Structure

A composite insulator, UHV AC technology, applied in insulators, electrical components, circuits, etc., can solve the problems of less consideration, large creepage distance, low pollution flashover voltage, etc., to achieve high utilization, increase creepage distance, improve Effects of pollution flashover voltage

Active Publication Date: 2016-02-24
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The existing design of composite insulators tends to blindly pursue a larger creepage distance, and seldom considers the role of the optimized umbrella design in improving the pollution flashover voltage, so the pollution flashover voltage per unit insulation height is low

Method used

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  • An EHV/UHV AC Composite Insulator Umbrella Structure
  • An EHV/UHV AC Composite Insulator Umbrella Structure
  • An EHV/UHV AC Composite Insulator Umbrella Structure

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The structural height of the composite insulator is 9000mm, the insulation distance is 8360mm, and the creepage distance is 32250mm. The umbrella spacing of the large umbrella is 90mm, the umbrella extension of the large umbrella is 90mm, and the umbrella extension of the small umbrella is 55mm. The insulator can be applied to suspension insulators of 1000kV UHV AC transmission lines.

Embodiment 2

[0039] The structural height of the composite insulator is 4400mm, the insulation distance is 4000mm, and the creepage distance is 16700mm. The umbrella spacing of the large umbrella is 80mm, the umbrella extension of the large umbrella is 90mm, and the umbrella extension of the small umbrella is 55mm. The insulator can be applied to suspension insulators of 500kV ultra-high voltage AC transmission lines.

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Abstract

The invention provides an umbrella-shaped structure of a super / extra-high voltage alternating-current composite insulator to optimize umbrella-shaped design and increase creep distance utilization rate. The umbrella-shaped structure comprises large umbrellas and small umbrellas which are equal in diameter and are alternately arranged, and the creep coefficient of the composite insulator ranges from 3.8 to 4.2. The flashover voltage of the umbrella-shaped composite insulator at unit insulating height under a hydrophilic condition is higher than that of an umbrella-shaped composite insulator with a large umbrella and two small umbrellas for a 1000kV extra-high voltage test demonstration project, the string lengths of composite insulators in regions with different contamination degrees can be decreased to different degrees, accordingly, the size of a tower is optimized, and the manufacturing cost of a power transmission line is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of high-voltage insulators, and in particular relates to an umbrella-shaped structure of an ultra / ultra-high voltage AC composite insulator. Background technique [0002] The insulator is an essential part of the high-voltage transmission line. It connects the metal wire to the tower, and at the same time withstands the potential difference between the wire and the tower to ensure the safe and stable operation of the transmission line. After running for a certain period of time, the surface is dirty, and under the influence of climatic conditions such as heavy fog and drizzle, discharge may occur along the wet and dirty insulating surface, or even penetrating discharge, resulting in insulation failure, that is, pollution flashover occurs (hereinafter referred to as pollution flashover). Pollution flashover will cause power outages and cause huge economic losses. Therefore, the poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B17/00H01B17/42
Inventor 周军于昕哲宿志一刘博徐跃能
Owner CHINA ELECTRIC POWER RES INST
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