Long-Life Insulation for Industrial and Utility Cables

Fisher, Eugene J.; McClung, L.B.

doi:10.1109/tia.1986.4504818

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“…Fax: +81-188-335477. E-mail address: wangxin@ipc.akita-u.ac.jp cables with XLPE dielectric insulation at the recommended dc voltage levels can cause the cable to fail after the cables are returned to service owing to the accumulation of space charge [11]. Alternative testing techniques are therefore needed in order to overcome the disadvantages of current dc HV tests.…”

Section: Introductionmentioning

confidence: 99%

Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Wang¹,

Yoshimura²,

Tanaka³

et al. 1998

J. Phys. D: Appl. Phys.

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The space charge characteristics in cross-linking polyethylene (LPE) are investigated under various electrical stresses from dc to power frequency. The pulsed electro-acoustic method is improved to meet the needs of measurement under ac voltages. The frequency and phase angle dependences of the space charge are studied by means of phase-locking and frequency-converting techniques. Test results show that space charge can develop and accumulate in LPE under an ultralow frequency voltage. The critical frequency of the applied ac voltage is less than 0.02 Hz. The mechanism of the formation of space charge in LPE under an ac voltage is discussed through degassing of a sample in vacuum.

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Section: Introductionmentioning

confidence: 99%