Proposal of New Water Electrode Method Used for Short-time Testing Method of Water Treeing and Consideration on Temperature Effects of Water Tree Initiation and Propagation

Uehara, Hiroaki; Kudo, Kazutoshi; Ishikawa, Yoshihiro; Kanekawa, Teruo; Tsuboi, Yoshikatsu; Ushiwata, Kodai; Yoshimitsu, Tetsuo

doi:10.1541/ieejfms.132.325

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Moreover, the supply of water only from inside the water tree is also different from that in an actual machine or polyethylene-insulated power cable, in which water in the surrounding area accumulates at a water tree. Therefore, we developed and investigated a new water electrode method [7].…”

Section: Introductionmentioning

confidence: 99%

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Effects of ions and waveforms on water tree initiation and propagation

Yawata

Uehara

Kudo

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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In this paper, we describe an investigation of the effects of ions and waveforms on water tree initiation and propagation utilizing a new water electrode method. The results indicate that ferric ions contribute to water tree initiation and propagation. Moreover, a water tree was initiated when the waveform of a pulse simulating an inverter waveform was applied for 2 weeks even at room temperature, in spite of no ac voltage application.

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Section: Introductionmentioning

confidence: 99%

“…Fig. 1 shows the configuration of the new water electrode considered in this investigation [7]. The fabrication method of the new water electrode is as follows.…”

Section: Introductionmentioning

confidence: 99%

Effects of ions and waveforms on water tree initiation and propagation

Yawata

Uehara

Kudo

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Study of Artificial Water Tree Degradation Method for XLPE Power Cables

et al. 2012

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In order to propose a method for producing water trees that measure a few millimeters in length in 20kV class to 60kV class XLPE cables, we discussed defect types and thermal conditions. First, surface roughness, needle protrusions, and line cracks were formed on the XLPE insulation surface of 6.6kV cables, and it was found that the water tree grew to a few millimeters in length from the needle protrusions and the line cracks. Second, water trees were generated in XLPE sheet and cable samples at room temperature and under a heat cycle and continuous elevated temperature conditions. Here, the longest water trees grew at room temperature. From these results, we selected needle protrusions and line cracks as defects and set room temperature as an artificial water tree degradation method. This method was applied with needle protrusions to a 22kV class XLPE cable, and we found that water tree length reached a few millimeters and AC breakdown voltage decreased to approximately 35% of the initial value.キーワード：電力用 CV ケーブル，水トリー，人工劣化，劣化診断 Keywords：XLPE power cables, water trees, artificial degradation, degradation diagnosis

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Proposal of New Water Electrode Method Used for Short-time Testing Method of Water Treeing and Consideration on Temperature Effects of Water Tree Initiation and Propagation

Cited by 2 publications

References 6 publications

Effects of ions and waveforms on water tree initiation and propagation

Effects of ions and waveforms on water tree initiation and propagation

Study of Artificial Water Tree Degradation Method for XLPE Power Cables

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