Development Characteristics and Critical Breakdown Criterion of Surface Discharge Light Pulse
The surface discharge of insulation is the main cause and pre-stage of slip flash and arc breakdown in high-voltage switch cabinet.Therefore,accurate and effective monitoring,tracking and early warning of abnormal insulation creepage are of great significance to ensure safe operation of equipment.In this paper,the optical pulse phase characteristics of insulation creepage with strong vertical electric field components in different discharge stages are studied by experiment.A method for dividing the stages of discharge development and critical breakdown criterion are proposed,based on multispectral radiation intensity information.Thus,a system based on multispectral intensity ratio to track and warn discharge is established.An experimental platform is built up by using a self-designed multi-band single-photon optical sensor which monitors the whole process of surface discharge development in this paper,and the ternary chroma statistical parameter characterizing the discharge development process are obtained.By means of fuzzy clustering methods and support vector machine algorithm,the space boundary of the critical breakdown stage is constructed and the severity of discharge is quantitatively evaluated.The results show that the method achieves a positive judgment rate of over 96.9%for the discharge stage.On the basis of the above research,the active warning logic of discharge hazard and a tracking and warning system based on the spectral ratio are established,providing a reference for the innovative application of discharge and arc monitoring in switch cabinet.
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