[논문]GIS 스페이서 내장형 저전력 측정용 변압기의 설계 및 제작

박성관; 이경렬; 김남훈; 김철환; 길경석

doi:10.4313/jkem.2024.37.2.8

GIS 스페이서 내장형 저전력 측정용 변압기의 설계 및 제작
Design and Fabrication of an LPVT Embedded in a GIS Spacer 원문보기

전기전자재료학회논문지 = Journal of the Korean Institute of Electrical and Electronic Material Engineers, v.37 no.2, 2024년, pp.175 - 181

박성관 (한국해양대학교 전기전자공학과) , 이경렬 (한국해양대학교 전기전자공학과) , 김남훈 (한국해양대학교 전기전자공학과) , 김철환 (국토교통부 철도시설안전과) , 길경석 (한국해양대학교 전기전자공학과)

Abstract ▼ AI-Helper

In electrical power substations, bulky iron-core potential transformers (PTs) are installed in a tank of gas-insulated switchgear (GIS) to measure system voltages. This paper proposed a low-power voltage transformer (LPVT) that can replace the conventional iron-core PTs in response to the demand for the digitalization of substations. The prototype LPVT consists of a capacitive voltage divider (CVD) which is embedded in a spacer and an impedance matching circuit using passive components. The CVD was fabricated with a flexible PCB to acquire enough insulation performance and withstand vibration and shock during operation. The performance of the LPVT was evaluated at 80%, 100%, and 120% of the rated voltage (38.1 kV) according to IEC 61869-11. An accuracy correction algorithm based on LabVIEW was applied to correct the voltage ratio and phase error. The corrected voltage ratio and phase error were +0.134% and +0.079 min., respectively, which satisfies the accuracy CL 0.2. In addition, the voltage ratio of LPVT was analyzed in ranges of -40~+40℃, and a temperature correction coefficient was applied to maintain the accuracy CL 0.2. By applying the LPVT proposed in this paper to the same rating GIS, it can be reduced the length per GIS bay by 11%, and the amount of SF6 by 5~7%.

주제어

표/그림 (12)

그림 Fig. 1. Application of tank type PT in GIS.
그림 Fig. 2. Principle of CVD in LPVT.
그림 Fig. 3. The prototype LPVT: (a) structure and (b) photograph.
표 Table 1. Relative permittivity of dielectric materials.
표 Table 2. Specifications of prototype LPVT.
그림 Fig. 4. Experimental set-up: (a) configuration and (b) photograph.
표 Table 3. Specifications of the equipment.
그림 Fig. 5. Output waveforms at the rated voltage: (a) voltage waveforms and (b) phase deviation.
표 Table 4. Measurement results of the LPVT.
그림 Fig. 6. Flowchart for LPVT accuracy correction.
그림 Fig. 7. Changes in the LPVT’s output as a function of the ambient temperature and the corrected result.
표 Table 5. Evaluation results of the LPVT after correction by IEC 61869-11.

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