Fault insulator on-line detection device and detection method based on magnetic array

Abstract

The invention discloses a fault insulator on-line detection device and method based on a magnetic array, the fault insulator on-line detection device based on the magnetic array comprises two magnetic antenna array elements capable of receiving high-voltage discharge electromagnetic waves of a fault insulator, and each magnetic antenna array element is connected with a signal amplification circuit. The two amplification circuits are connected with a signal synthesis circuit, the signal synthesis circuit is connected with a high-speed data acquisition module, the high-speed data acquisition module is connected with a microprocessor module, and the microprocessor module is connected with a computer. The detection method comprises the following steps: a, projecting a detected insulator to a horizontal plane, placing magnetic antenna array elements in parallel, and enabling a projection point to be at a central point of two array element areas; b, collecting signals and obtaining a spectrogram; and c, performing power integration on spectrum lines, and judging whether the insulator has a fault or not according to an integral value. According to the method, various external interferences and noises are eliminated, uninterruptible power detection is realized, the operation is simple and convenient, and the detection effect is good.

Description

technical field [0001] The invention belongs to the technical field of insulator detection, and in particular relates to a fault insulator online detection device and detection method based on a magnetic array. Background technique [0002] At present, a large number of porcelain insulators are used in power system transmission lines and substations. Porcelain insulators are subject to power frequency voltage, sun and rain, gray salt haze, mechanical stress, lightning, etc. for a long time, and they will deteriorate. Because the internal insulation of the deteriorated insulator is lower than the external insulation, it will be damaged during lightning strikes, power frequency, pollution flashover, etc. Internal insulation breakdown occurs, which causes insulators to drop out of series, which seriously threatens the safe operation of the power grid. [0003] In the current work, on-site detection of insulators mainly uses spark gap method, ultrasonic method, infrared tempera...

AI Technical Summary

Problems solved by technology

The main problems are as follows: the spark gap method involves safety and labor intensity, and needs to listen to the sound to observe the sparks; the ultrasonic method, infrared temperature measurement method, and infrared imaging method are susceptible to environmental weather interference, high misjudgment rate, and low detection efficiency; these deficiencies make It is difficult for inspection personnel to complete the coverage inspection of insulators in operation during the inspection period. The status of insulators in operation is in an unknown state. They usually rely on experience to arrange inspection work, which is poor in pertinence and pre-control, and is often handled passively after accidents occur.

However, it will receive various external interference and noise. Since the discharge electromagnetic wave is broadband, both magnetic and electric antennas must be broadband receiving.

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