A method for evaluating safe area of ​​pollution degree of transmission line insulators

A technology for safety areas and transmission lines, applied in the direction of testing dielectric strength, etc., to achieve the effect of intuitive safety area evaluation

Active Publication Date: 2016-09-28
STATE GRID CORP OF CHINA +1
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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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  • A method for evaluating safe area of ​​pollution degree of transmission line insulators
  • A method for evaluating safe area of ​​pollution degree of transmission line insulators
  • A method for evaluating safe area of ​​pollution degree of transmission line insulators

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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. to 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 densi...

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Abstract

The invention discloses a method capable of effectively evaluating the dirty insulation state on the surface of an insulator of a power transmission line. At present, the method adopted by most transmission line operation and maintenance units is to directly use the comparison method of equivalent salt density, which has certain limitations. The present invention obtains the quantitative relationship between the pollution flashover voltage of live running insulators and their surface equivalent salt density and gray density through statistical analysis of the distribution law of the gray density / equivalent salt density ratio of live running insulators; comprehensively considering the 50% flashover probability Based on factors such as pollution flashover voltage, insulator string type, and the highest operating voltage of transmission lines, the safe area map of pollution degree of transmission line insulators is drawn to obtain the safe areas of various pollution degrees. The invention comprehensively considers the influence of equivalent salt density and dust density on the surface of the insulator, and considers the difference in the structural type of the insulator, and can more accurately and intuitively evaluate the safe area of ​​pollution degree of the insulator of the transmission line.

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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Patent Type & Authority Patents(China)
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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