• 정보학연구
• /
• 제8권4호
• /
• pp.1-7
• /
• 2005

Investigations of high frequency current transformer(HF-CT) waveform characteristics of the surface leakage on kaolin polluted EPDM polymer insulators have been performed. This work is part of a program aimed at examining the potential for HF-CT waveform characteristics analysis to provide information about the environment contaminants and environment condition of polymer insulators. The investigation reported examined the HF-CT waveform characteristics at high frequencies. The use of high frequency measurements for on-line applications reduces electrical inference. This work was peformed utilizing HF-CT to monitor of surface polluted discharge. It was found that HF-CT waveform frequency spectrum, magnitude depend on importantly the duration of the surface discharge activity.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
• /
• pp.1100-1103
• /
• 2004

The paper presents the results of using the fundamental and the low frequency harmonic components of leakage current to study aging of EPDM insulator for contaminated condition by kaolin. The largeer the leakage current during 200ms, the higher harmonic component at 60hz. The harmonic component at 60hz and the odd order harmonics is increase relation without Kaolin Conent. Arcing on the surface was always associated with distortion in the leakage current; hence the low frequency components of the leakage currnent can be used as a means to evaluate the surface degration. Both the fundamental and 3rd & 5th harmonics increase dry-band activity.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.2019-2020
• /
• 2008

옥외에서 폴리머 애자의 사용량이 급격하게 증가하는 이유는 자기제 애자에 비해 경량이면서 오손특성이 우수하다는 장점 때문이다. 약 10년 전 국내 배전선로에 설치된 EPDM(Ethylene propylene diene monomer) 재질의 폴리머 현수애자의 섬락고장이 있었다. 폴리머 애자는 재질 특성상 사용시간에 따라 표면 열화가 진행되고, 표면의 절연저항이 감소하여 누설전류가 증가하게 된다. 표면 섬락고장을 유발하는 누설전류는 절연물 표면 상태에 많은 영향을 받는다. 본 연구에서는 폴리머애자 표면에 부착된 오손물이 전기적 특성에 미치는 영향을 분석하였다. 표면에 부착된 미세한 오손물은 발수성을 급격히 저하시켰으며, 장시간 수분에 노출될 경우 상용전압에서 표면 방전의 원인이 되었다. 결과적으로 부착된 오손물은 누설전류와 절연내력에 영향을 주어 절연 특성을 저하시키게 된다.

• 한국전기전자재료학회논문지
• /
• 제33권2호
• /
• pp.135-140
• /
• 2020

An experimental study was conducted using the tracking wheel test (IEC 62217) method for evaluating the performance of insulator materials, in particular ethylene propylene diene monomer (EPDM) and silicone rubber. In addition, we studied the tracking characteristics resulting from applying the same method for the shape of the insulator housing, that is, the performance of regular and alternating sheds. The evaluation parameters were leakage current, surface characteristics, SEM, EDX, hydrophobicity, and temperature distribution; likewise, we applied the commercial frequency dry (and wet) flashover voltage test. We found that the regular shed had a greater leakage current than the alternating shed and that the recovery of the hydrophobicity in terms of rest time was greater than that of the EPDM in terms of leakage current. All of the regular-shed insulators of silicone rubber had tracking traces and choking on the sheath parting line, while the alternating shed showed only choking at the interface but no tracking traces. Therefore, it can be concluded that the commercial frequency wet flashover voltage of the silicone rubber with regular shed before and after the tracking wheel test is higher than that of the alternating shed.