Charged detection method for insulator of high voltage direct current transmission line

Abstract

The present invention belongs to the field of electric power transmission, and is especially live detection method of synthetic insulator fault and zero value insulator in high voltage DC power transmission line. The detection method includes the steps of: detecting the AC harmonic electric field distribution around the insulator; comparing with standard electric field distribution; and judging whether the insulator is normal or in fault based on whether to have obvious difference between the two distributions. The present invention facilitates the detection of insulator in high voltage DC power transmission line with voltage level as high as 500 KV and has relatively high sensitivity.

Description

technical field [0001] The invention belongs to the field of electric power transmission, and in particular relates to a method for live detection of synthetic insulator defects and zero-value insulators of high-voltage direct current transmission lines. Background technique [0002] At present, the common way to detect composite insulators of HVDC transmission lines is visual inspection with high-powered telescopes. This method cannot see internal defects and hidden defects of insulators. In a very few areas, infrared imagers are used to detect insulators based on temperature changes, but they cannot be used under strong background light during the day, and the cost is also expensive. As for the low-zero value suspension insulators of HVDC transmission lines, there is currently no live detection method. Contents of the invention [0003] The purpose of the present invention is to provide a high-sensitivity, easy-to-use live detection method for defects of high-voltage di...

AI Technical Summary

Problems solved by technology

[0002] At present, the common way to detect composite insulators of HVDC transmission lines is visual inspection with high-powered telescopes. This method cannot see internal defects and hidden defects of insulators.

In a very few areas, infrared imagers are used to detect insulators based on temperature changes, but they cannot be used under strong background light during the day, and the cost is also expensive

For the low-zero value suspension insulators of HVDC transmission lines, there is currently no live detection method

Images