Method for electrified testing high-voltage transmission line insulator

Abstract

The invention refers to a live-detection method of insulator fault in HV transmission line, belonging to power transmission field, the sensitivity high and the use convenient. The technique project; when synthetical insulator has electric fault or ceramic insulator has zero-value insulator, the axial and radical distribution along insulator of the surrounding electric field will produce distortion, detect the distribution and respectively compare with non-fault standard electric field, if no obvious difference, judge normal, otherwise, judge the insulator has fault.

Description

Technical field [0001] The invention belongs to the field of power transmission, and in particular relates to a method for on-line detection of insulator defects of high-voltage transmission lines. Background technique [0002] At present, the common method for detecting composite insulators on high-voltage transmission lines is visual inspection with high-power telescopes. This method cannot see the internal defects and hidden defects of the insulators. The commonly used tool for detecting low-zero value suspension insulators in high-voltage transmission lines is spark forks. During detection, the two metal contacts of the spark forks are overlapped with the iron feet and iron caps of the insulators. If the insulator has good insulation performance, the voltage breakdown assumed by the insulator The spark gap produces spark discharge. The operator judges whether the insulator is good according to the sound of the spark discharge. This method cannot work under the background of s...

AI Technical Summary

Problems solved by technology

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

The common tool for detecting low-zero value suspension insulators of high-voltage transmission lines is the spark fork. During the test, the two metal contacts of the spark fork are respectively lapped with the iron feet and iron caps of the insulator. If the insulation performance of the insulator is good, the voltage borne by the insulator will break down Spark gap, spark discharge is generated, the operator judges whether the insulator is good or not according to the sound of spark discharge, this method cannot work in the background of strong noise, nor can it detect insulators with a long distance, and the labor intensity of piece by piece inspection is high, which will cause short circuit of good insulators Dangerous, cannot be used to detect composite 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

Someone improved the spark fork into an instrument that can automatically measure the voltage distribution of insulators, but the mechanical part is complicated, and there is still the possibility of short-circuiting good insulators to cause danger, so it cannot be used to detect composite insulators

Some countries and regions have tried a high-voltage transmission line insulator detector. This instrument only uses the longitudinal electric field distribution curve around the insulator to detect the insulator, which overcomes the inability of the existing insulator detection methods to take into account versatility, accuracy, simplicity, safety and Insufficient in terms of cost, etc., but the method adopted by the instrument determines in principle that it is less sensitive to the detection of defects located in the middle of the insulator or at the high-voltage end of the insulator with a voltage equalizing ring nearby

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