| TEV detecion method is a new partial discharge detection method. It works by detectingthe electromagnetic waves generated by transient sourse of partial discharge of switchgear.Early detection of partial discharge detection is an important means of insulated electricalequipment hazards. For switchgear and gas insulated switchgear (GIS) and other metalenclosed electrical equipment, ultrasonic wave detection method and TEV detection arewidely used, the principle has been extensively studied, there is much ultrasonic principleproduct, but the technology based on the principle of TEV to partial discharge detectiontechnology has been monopolized by the invention of the technology enterprise EATechnology.Experts in partial detection field often pay much attention to the data analying and theuse of land wave detection system, and to development of TEV, there are still manydifficulties to be resolved, such as: principle of TEV sensor, and the principle of positioningtechnology of TEV, the mechanism of transient ground voltage (TEV) and the like.TEV technology principle and the principle of location is the cure of this paper,and thepaper design a partial discharge detection device. Firstly, this paper will use relevanttheoretical knowledge of electromagnetic field and wave to wave detection principle study,the generation mechanism of electromagnetic signals from the Bureau put this article,refraction and reflection of electromagnetic PD waves and PD electromagnetic processes inthe decay process switchgear metal wall three aspects studied, gives expression to expressionand transient voltage signals to wave, then, this paper to the metal surface waves generatedvoltage transients on the principle of electromagnetic field simulation to study the decay lawand TEV feature to radio signals. On the basic of In-depth analysis to the radio waves, thispaper propose a hardware solution to TEV detection system, field test shows that this devicehas good permormance. |
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