[논문]몰드 변압기의 절연 진단을 위한 로고우스키형 부분방전 센서의 설계 및 제작

이경렬; 김성욱; 길경석

doi:10.4313/jkem.2022.35.6.8

몰드 변압기의 절연 진단을 위한 로고우스키형 부분방전 센서의 설계 및 제작
Design and Fabrication of Rogowski-type Partial Discharge Sensor for Insulation Diagnosis of Cast-Resin Transformers 원문보기

전기전자재료학회논문지 = Journal of the Korean institute of electronic material engineers, v.35 no.6, 2022년, pp.594 - 602

이경렬 (한국수력원자력(주) 원전수출처) , 김성욱 (신라대학교 스마트전기공학과) , 길경석 (한국해양대학교 전기전자공학과)

Abstract ▼ AI-Helper

Cast-resin transformers are widely installed in various electrical power systems because of their low operating cost and low influence on external environmental factors. However, when they have an internal defect during the manufacturing process or operation, a partial discharge (PD) occurs, and eventually destroys the insulation. In this paper, a Rogowski-type PD sensor was studied to replace commercial PD sensors used for the insulation diagnosis of power apparatus. The proposed PD sensor was manufactured with four different types of PCB-based winding structures, and it was analyzed in terms of the detection characteristics for standard calibration pulses and the changes of the output voltage according to the distance. The output increased linearly in accordance with the applied discharge amount. It was confirmed that the hexagon structure sensor had the highest sensitivity, because the winding cross-sectional area of the sensor was larger than others. In addition, as the distance from the defect increased, the output voltage of the sensors decreased by 7.32% on average. It was also confirmed that the attenuation rate according to the distance decreased as the input discharge amount increased. For the application of this new type sensor, PD electrode system was designed to simulate the void defect. Waveforms and PRPD patterns measured by the proposed PD sensors at DIV and 120% of DIV were the same as the results measured by MPD 600 based on IEC 60270. The proposed PD sensors can be installed on the inner wall of the transformer tank by coating its surfaces with a non-conductive material; therefore, it is possible to detect internal defects more effectively at a closer distance from the defect than the conventional sensors.

주제어

표/그림 (10)

그림 Fig. 1. Rogowski-type PD sensor. (a) schematic diagram, (b) geometry configuration of single coil, and (c) equivalent circuit.
그림 Fig. 2. Four different Rogowski-type PD sensors. (a) rectangle, (b) diamond, (c) hexagon, and (d) ellipse.
그림 Fig. 3. PD electrode system. (a) void specimen, (b) electrode system, and (c) electrode system with stand.
표 Table 1. Geometrical parameters of four different Rogowski-type PD sensors.
그림 Fig. 4. Experimental setup. (a) Photograph and (b) configuration.
그림 Fig. 5. The output of Rogowski-type PD sensors in accordance with PD signals.
그림 Fig. 6. Examples of output waveform of 50 pC. (a) hexagon, (b) diamond, (c) ellipse, and (d) rectangle.
그림 Fig. 7. Distance dependence of Rogowski-type PD sensors at (a) 50 pC, (b) 200 pC, (c) 500 pC, and (d) 1,000 pC.
그림 Fig. 8. PRPD patterns at DIV (a) MPD 600 and (b) DSO.
그림 Fig. 9. PRPD patterns at 120% of DIV (a) MPD 600 and (b) DSO.

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