[논문]TEV 검출에 의한 가스 절연 개폐기의 절연 진단

공정배; 길경석; 김성욱

doi:10.4313/jkem.2019.32.4.307

TEV 검출에 의한 가스 절연 개폐기의 절연 진단
Insulation Diagnosis of Gas-Insulated Switchgears by TEV Detection 원문보기

전기전자재료학회논문지 = Journal of the Korean institute of electronic material engineers, v.32 no.4, 2019년, pp.307 - 312

공정배 (한국해양대학교 전기전자공학과) , 길경석 (한국해양대학교 전기전자공학과) , 김성욱 ((주)효성 Power Asset Management팀)

Abstract ▼ AI-Helper

Transient earth voltage (TEV) signals propagate on metal surfaces when partial discharge (PD) occurs due to the deterioration of insulation performance in the operation of gas-insulated switchgears (GIS). A TEV sensor has advantages of high sensitivity and convenient installation for detecting PD defects. However, the TEV sensor depends on imports in domestic and detailed studies have not been conducted. In this study, a sensor was designed and fabricated by the TEV principle and its response characteristics were evaluated for detecting PD defects, which were simulated as protrusion on conductor (POC), protrusion on enclosure (POE), and free moving particle (FMP) defects. Finally, the PD-induced TEV signals were measured and phase-resolved partial discharge (PRPD) patterns were analyzed to identify the type of defect.

주제어

표/그림 (9)

그림 Fig. 1. TEV sensor.
그림 Fig. 2. Configuration of experimental setup for verifying the response characteristics.
그림 Fig. 3. Frequency spectrum of TEV sensor.
그림 Fig. 4. Result of response characteristics.
그림 Fig. 5. Configuration of experimental setup.
그림 Fig. 6. Electrode systems.
그림 Fig. 7. PD voltage pulse.
그림 Fig. 8. PD-induced TEV signal.
그림 Fig. 9. PRPD patterns.

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가설 설정

1) It is well known that PD-induced TEV signal has frequency range up to 150 MHz and the fabricated sensor can detect the signal in the whole frequency range.
2) Discharge pulse has average repetition time from a few hundred microseconds to a few milliseconds when PD occurs. The time differences between the directly detected voltage signal and the TEV signal was 8ns, the proposed sensor therefore can acquire all the PD pulses.

제안 방법

In order to verify the response characteristics of the fabricated TEV sensor, experimental system consisted of a signal generator (SG, 1710), a pulse generator (PG, CAL1A), a metal-clad enclosure, and digital storage oscilloscope (DSO, DL 9140) was configured. The experimental setup is shown in Fig.
The pulse generator is usually used to calibrate the experimental system by generating a signal similar to the PD magnitude up to 100 pC. In this experiment, it was used to identify the sensitivity and time response. Figure 4(a) shows the example of response time between the direct detection waveform of the current signal applied by the pulse generator and the signal detected by the TEV sensor.
The research and development of TEV sensor were not conducted in detail in domestic even though it has significant advantages in PD detection for condition assessment of GIS. In this paper, the TEV sensor was fabricated with theoretical analysis and its response characteristics were analyzed to check the performance for detecting PD signals. From this paper, the following conclusions can be obtained.
In this paper, the high-sensitive TEV sensor was designed and fabricated to detect PDs and phase- resolved partial discharge (PRPD) patterns were analyzed to identify types of PD causes for GIS. The performance of TEV sensor proposed in this paper was confirmed to be appropriate for PD diagnosis of GIS and would be utilized for asset management through optimal maintenance of power equipment in the future.

성능/효과

3) PRPD patterns were analyzed to distinguish types of PD defects. The results showed that most of PD pulses were distributed in the positive and negative half of the applied voltage in the POC and POE, respectively. PD pulses in the FMP were distributed over the whole phases and PD counts were much less than other two defects.

후속연구

In this paper, the high-sensitive TEV sensor was designed and fabricated to detect PDs and phase- resolved partial discharge (PRPD) patterns were analyzed to identify types of PD causes for GIS. The performance of TEV sensor proposed in this paper was confirmed to be appropriate for PD diagnosis of GIS and would be utilized for asset management through optimal maintenance of power equipment in the future.

참고문헌 (7)

IEC Publication 60270, High-Voltage Test Techniques: Partial Discharge Measurements, 2010.
CIGRE JWG 33/23/12, Insulation Co-Ordination of GIS: Return of Experience, on Site Tests and Diagnostic Techniques, Electra No. 176, 1998.
S. M. Markalous, S. Tenbohlen, and K. Feser, IEEE Trans. Dielectr. Electr. Insul., 15, 1576 (2008). [DOI: https://doi.org/10.1109/TDEI.2008.4712660]

상세보기
G. Wang, H. E. Jo, S. J. Kim, S. W. Kim, and G. S. Kil, Measurement, 91, 351 (2016). [DOI: https://doi.org/10.1016/j.measurement.2016.05.033]

상세보기
B. H. Lee, S. H. Lee, and G. S. Kil, Proc. Conference of The Korean Institute of Electrical Engineers (KIEE, Seoul, Korea, 1994) p. 287.
N. Davies, J.C.Y. Tang, and P. Shiel, Proc. 19th International Conference on Electricity Distribution (Elec. Dist., Vienna, Austria, 2007) p. 1.
G. Wang, W. H. Kim, J. B. Kong, G. S. Kil, and H. K. Ji, Trans. Electr. Electron. Mater., 19, 195 (2018). [DOI:https://doi.org/10.1007/s42341-018-0037-5]

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