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Method for safe region evaluation of filthy degree of electric transmission line insulator

A technology for safe areas and transmission lines, which is applied in the direction of testing dielectric strength, etc., to achieve the effect of intuitive safe area assessment

Active Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +1
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  • Abstract
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Problems solved by technology

In fact, due to the differences in the pollution sources near the transmission line and the structure of the insulator itself, the distribution of the equivalent salt density (ESDD) and gray density (NSDD) has a certain degree of randomness, and the comparison method directly using the equivalent salt density (ESDD) is not very appropriate

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  • Method for safe region evaluation of filthy degree of electric transmission line insulator
  • Method for safe region evaluation of filthy degree of electric transmission line insulator
  • Method for safe region evaluation of filthy degree of electric transmission line insulator

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Taking the insulators of 110kV, 220kV and 500kV grid-connected transmission lines in a certain area as an example, the pollution degree safety area evaluation technology based on pollution flashover characteristics is used to evaluate the pollution and insulation state of the insulator surface. The specific steps are as follows:

[0031] ① Sampling of insulator strings of live transmission lines. The sampling insulator model involves LXY 1 -70, FC7P / 146, FC70P / 146, FC160P / 170, XWP 2 -70.

[0032] ② Carry out the pollution degree test on the surface of the insulator. Take LXY 1 -70 as an example, the test results of equivalent salt density (ESDD) and gray density (NSDD) are shown in Table 1.

[0033] Table 1 LXY 1 -70 insulator pollution flashover voltage test data

[0034]

[0035]

[0036] Note: K is the equivalent salt den...

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Abstract

The invention discloses a method for safe region evaluation of the filthy degree of an electric transmission line insulator. At present, most electric transmission line operation and maintenance units directly adopt an equivalent salt deposit density comparison method which has certain limitations. According to the method for safe region evaluation of the filthy degree of the electric transmission line insulator, through statistics and analysis of the distribution rule of dust density / equivalent salt deposit density ratios of the hot-line work insulator, the quantization relationship between the flashover voltage and the equivalent salt deposit density and dust density of the surface of the hot-line work insulator is obtained through experimental investigation; factors such as flashover voltage with 50% flashover probability, insulator serial type and the highest operation voltage of a transmission line are considered comprehensively, a safe region graph of the filthy degree of the electric transmission line insulator is drawn, and then the safety regions of various filthy degrees are obtained; the influence of the equivalent salt deposit density and dust density of the surface of the insulator are considered comprehensively, the structural type difference of insulators is considered, and therefore safe region evaluation of the filthy degree of the electric transmission line insulator can be achieved more accurately and visually.

Description

technical field [0001] The present invention relates to a method for evaluating the safety area of ​​pollution degree of insulators in transmission lines, in particular to an evaluation method for the safety area of ​​equivalent salt density (ESDD) and gray density (NSDD) of transmission line insulator strings in hanging grid operation based on pollution flashover characteristics . Background technique [0002] It is of great significance to grasp the surface pollution status of insulators in grid-connected operation, evaluate whether the pollution status of insulators is in a safe area, and judge whether there is a risk of pollution flashover. [0003] Under the current condition-based maintenance system of transmission lines, there are very few power outages on transmission lines, and it is very difficult to sample natural pollution insulators that are hanging on the grid. How to use a reasonable and effective evaluation method to evaluate the safe area of ​​pollution deg...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 王少华胡文堂梅冰笑刘黎吴明祥金祖山李思南周国良李特董建洋
Owner STATE GRID CORP OF CHINA
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