Experimental study on the causes of electrical breakdown of EHV XLPE insulation using 'prebreakdown partial discharge detection method'

Suzuki, Hisako; Endoh, Takeshi; Sekii, Y.

doi:10.1109/ceidp.1990.201351

Cited by 15 publications

(2 citation statements)

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“…It was observed by the prebreakdown detection method [4] that many vented and bow-tie water trees had been grown in the field-aged 66 kV cables. Water trees were observed by a reflection microscope immediately after the cables had been sliced [7].…”

Section: Nature Of Blue Watermentioning

confidence: 98%

“…The prebreakdown detection method [4] was carried out in order to locate the position of water and electrical trees in these field-aged cables. By increasing the applied ac voltage and shutting it off at a moment where the detected partial discharge (PD) reached 200 pC, the generation point of PD could be located within a length of -2 m. The cable insulation of the final length of -2 m was sliced into thin sheets with a thickness of 1 mm to find the trees.…”

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confidence: 99%

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Experimental investigation on the cause of harmfulness of the blue water tree to XLPE cable insulation

Katsuta

Toya

Li³

et al. 1999

IEEE Trans. Dielect. Electr. Insul.

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Through investigations made on crosslinked polyethylene (XLPE) insulated power cables that had experienced failures, blue-colored water trees were observed in addition to ordinary white water trees. The blue water tree was found to be much more harmful than the white water tree, since more electrical trees started at the blue trees. Elemental analysis revealed that iron and sulfur exist in the blue tree. In the case of this blue water tree, space charge exists abundantly but only at the tree tip, while no charge signal is observed on the electrode from which the tree starts. This indicates that the conductivity of the blue tree is very high. This is considered to be the main reason of the harmfulness of this tree.

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Section: Nature Of Blue Watermentioning

confidence: 98%

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confidence: 99%