Portable fault insulator online detection device and detection method

Abstract

The invention discloses a portable fault insulator online detection device and a detection method, the portable fault insulator online detection device comprises three magnetic antenna array elements with different frequency bands, the three magnetic antenna array elements are used for receiving high-voltage discharge electromagnetic waves of a fault insulator, the three magnetic antenna array elements are connected with a wave band switch, and the band switch, a small signal amplification module, a logarithm amplification module, a detection module, the acquisition module, a microprocessor module and a display module are connected in sequence. The detection method comprises the following steps: a, enabling the direction zero point of a magnetic antenna array element to point to a detected insulator; b, sequentially selecting magnetic antenna array elements to receive and read display values through a band switch; c, enabling the strongest point of the direction of the magnetic antenna array element to point to the detected insulator; d, sequentially selecting the magnetic antenna array elements to receive and read the display values through a band switch; e, when one of the differences of the two measurement values of the corresponding array element is greater than a threshold value, judging that the insulator has a fault. The device is portable, easy to operate and good in detection effect.

Description

technical field [0001] The invention belongs to the technical field of insulator detection, and in particular relates to a portable fault insulator on-line detection device and detection method. 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 long-term power frequency voltage, sun and rain, gray salt haze, mechanical stress, lightning, etc., 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 temperature measurement metho...

AI Technical Summary

Problems solved by technology

There are mainly the following problems: 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 unknown. They usually rely on experience to arrange inspection work. The pertinence and pre-control are poor, and they are often dealt with passively after accidents occur.

These hinder the miniaturization and portability of detection devices

Images