A Study on Low Participation of Oxygen in Generation and Progress of Bow-tie Trees

Kumazawa, T.; Morinaga, Seiji

doi:10.1541/ieejfms.133.322

Cited by 2 publications

(1 citation statement)

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“…We previously investigated the behavior of BTTs by various immersion voltage tests using XLPE (cross‐linked polyethylene) samples. As reported earlier it was assumed that BTTs originate in an environment in which ions move inside the XLPE bulk in a certain direction for a certain time. In addition, ions rather than water were assumed to be responsible for water‐tree deterioration phenomena, and some unknown reactions involving metal ions were assumed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dependence of Bow‐Tie Trees on Nuclei

Kumazawa

Morinaga²

2015

Electrical Engineering Japan

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SUMMARYBow-tie trees (BTTs) generated by contaminants, for example, metal, amber (overcured resin), carbon, and voids in the insulators of XLPE (cross-linked polyethylene) cables still remain a factor contributing to deterioration. In order to examine the influence of contaminants on the behavior of BTT generation, we performed several experiments using XLPE samples containing copper powder, finely divided overcured resin, or micro voids as BTT nuclei. As a result of the experiments, in spite of the great difference in the distribution of particle diameter, and the shape and permittivity of the nuclei, all samples containing copper powder or overcured resin showed a common dependence of the number of BTTs on the mean size of the BTT nuclei. Consequently, there is no fundamental difference in these nuclei. We consider that the lower limit of the nucleus size suitable for BTT generation is determined by the local electric field at the tip of the nuclei and its upper limit is determined by the extent of stagnation of ions around the nuclei. Moreover, we consider that the increase in the mean size of BTTs with the initial water content was caused by relaxation of the local electric field due to absorbed water in XLPE samples. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 191(3): 1-8, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Introductionmentioning

confidence: 99%