Method and equipment for detecting insulation performance of combined electric appliance based on photoelectric joint technology

Abstract

The invention discloses a method for detecting the insulation performance of a combined electric appliance based on a photoelectric joint technology. The method comprises the steps of employing an optical detection head and a CCD collection unit to respectively detect discharge optical signals, respectively converting the discharge optical signals into electric signals, carrying out the feature extraction and information fusion, and carrying out the artificial intelligence diagnosis. The optical detection and diagnosis technology is utilized, the partial discharge signal in the equipment can be accurately and efficiently monitored, the frequency of irregular overhaul of equipment such as a combined electrical appliance is reduced, the input of manpower, material resources and financial resources is reduced, and the operation and maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent diagnosis, in particular to a method and equipment for detecting the insulation performance of combined electrical appliances based on photoelectric combination technology. Background technique [0002] Due to the complex structure of combined electrical equipment, the process and quality requirements for equipment manufacturing, installation, and maintenance are extremely high. Insulation defects, resulting in local electric field distortion, thereby inducing partial discharge. Partial discharge is the cause of the deterioration of the internal insulation of combined electrical equipment, and it is also a characteristic quantity that characterizes the internal insulation status of insulating combined electrical equipment. In the process of partial discharge, accompanied by various physical and chemical phenomena such as light, sound, heat, electricity, etc., these physical and chemical infor...

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Problems solved by technology

[0003] At present, UHF and ultrasonic methods are mainly used for partial discharge detection of combined electrical equipment in EHV and UHV substations. At present, many EHV and UHV substations in China have installed partial discharge on-line monitoring based on UHF detection technology. system, however, so far, in the case of many insulation defect discharge breakdown accidents, it has failed to give an early warning. The UHF online monitoring system often sends out alarm information, and the alarm is hundreds or even thousands of times a day. False alarms and The leakage alarm seriously disrupts the normal working order of the power grid operation and maintenance unit, and reduces the practical value and significance of the online monitoring system

The reliability of the diagnostic results of the UHF partial discharge on-line monitoring system is low because there are many internal and external electromagnetic interferences in the EHV and UHV substations. For these interferences, the current UHF detection method is not immune enough. both difficult to restrain and difficult to distinguish

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