Defect warning device of insulating member in switch cabinet

Abstract

The present invention discloses a defect warning device of an insulating member in a switch cabinet. The device comprises four paths of gas sensors, a signal processing unit, an A / D conversion circuit, a microprocessor control unit and a host computer. The four paths of gas sensors, the signal processing unit, the A / D conversion circuit, the microprocessor control unit and the host computer are connected in order. The four paths of gas sensors are arranged in the switch cabinet and are hydrogen cyanide, carbon dioxide, ammonia and ozone sensors. The device has the advantages of simple structure, convenient operation, strong external anti-interference ability and high defect relevance, and the defect early warning can be realized. A low-pass filter and four paths of AD sampling are employed, the measuring range is expanded, the circuit structure is simplified, the volume of the device is reduced, and the reliability of the device is enhanced.

Description

technical field [0001] The invention relates to a defect early warning device for insulating parts in a switch cabinet. Background technique [0002] With the increasing expansion of the power grid and the increasingly complex structure of the power grid, the unattended management mode of substations and the popularization and promotion of comprehensive automation, the power outage accidents caused by high-voltage switchgear failures have brought more and more losses to production and life. The reason for the failure of the switchgear is mainly caused by two defects of the insulating parts. One is the surface creepage of the organic insulating material but no carbonization channel defect is formed. Once this defect is formed, it will continue to deteriorate during long-term power operation and material aging. , so that the surface of the insulating material penetrates through and causes serious switchgear accidents; another defect is the partial discharge caused by the deter...

AI Technical Summary

Problems solved by technology

The reason for the failure of the switchgear is mainly caused by two defects of the insulating parts. One is the surface creepage of the organic insulating material but no carbonization channel defect is formed. Once this defect is formed, it will continue to deteriorate during long-term power operation and material aging. , so that the surface of the insulating material penetrates through and causes serious switchgear accidents; another defect is the partial discharge caused by the deterioration of the insulating parts due to construction or production process. accident

The temperature monitoring of the switchgear is mainly aimed at the problem of pyrolysis and aging of the insulating material caused by the overheating of the contacts. The temperature monitoring only measures the temperature of the electrical contacts of the high-voltage switchgear in isolation, without considering the status information of the switchgear, environmental parameters, etc. Diagnosis of the working state of the electrical contacts can only give an alarm for abnormal temperature. When the abnormal temperature occurs, the switchgear is already in or close to a fault state

The switchgear partial discharge monitoring method is divided into electrical measurement method and non-electrical measurement method. The problem of electrical measurement method is that it has poor anti-interference ability and cannot be effectively used for on-site on-line monitoring. It requires power failure experiments and cannot be applied to live processes; The most mainstream electrical measurement method is the ultrasonic method, but when it encounters obstacles in the propagation process of the switchgear, it may have the disadvantage of multiple reflection and refraction, resulting in uncertain detection sensitivity.

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