전자기파 및 음향파를 이용한 배전반 부분방전 위치검출 시스템 개발

Abstract

If there are microscopic defects in the insulators of electric devices, the electric field is concentrated in that area and a weak discharge occurs. This can lead to insulation deterioration and lead to insulation breakdown after a long period of time. Therefore, if insulation deterioration is detected early using factors such as partial discharge and an appropriate response is made according to the degree of deterioration, the electrical facilities can be maintained more stably. In fact, the construction of a diagnostic system to monitor power equipment deterioration through prototypes such as partial discharge pattern analysis using various sensors is actively underway for ultra-high voltage switchgear, but a high-precision diagnostic system has not been universally established in switchboards. This is because the diagnostic system itself is expensive and it is difficult to install various sensors in a narrow steel enclosure. Discharge detection and measurement in switchboards is based on the energy exchange that occurs during discharge, which includes electric pulse current, radiation (light), sound (noise), gas pressure increase, and chemical reaction, etc. Therefore, when a partial discharge occurs, the electromagnetic waves and sound waves appear. In this paper, we develop a partial discharge detection system using electromagnetic waves and sound waves in a switchboard. It includes hardware design, software design, and location estimation monitoring system for partial discharge location estimation. We present the experimental results in three areas: electromagnetic and acoustic wave detection, partial discharge location identification accuracy, and visual display accuracy when an event occurs.