High-Field Conduction and Electrical Breakdown of Polyethylene at High Temperatures

Tipo de material: Texto

TextoSeries ; Japanese Journal of applied physics, 24(8R), p.988, 1985Trabajos contenidos:

Hikita, M
Tajima, S
Kanno, I
Ishino, I
Sawa, G
Ieda, M

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Resumen: The mechanism of the breakdown occurring when a dc ramp voltage is applied to low-density polyethylene (LDPE)and silane cross-linked PE at high temperatures is discussed, using experimental results on the Young's modulus Y, high-field conduction and pre-breakdown currents. The electric strength FB of PE was found to be a function of Y, irrespective of cross-linking. It was also found that, over a wide temperature range, a sharp pre-breakdown current increase could not be detected till a time before breakdown of 100 ns, the resolution limit of the measuring system. The results showed that, under the present experimental conditions, thermal breakdown is not applicable to PE over a wide temperature range and that breakdown is initiated by an electronic process which has a very short time lag to breakdown of the order of some tens of ns or less.

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The mechanism of the breakdown occurring when a dc ramp voltage is applied to low-density polyethylene (LDPE)and silane cross-linked PE at high temperatures is discussed, using experimental results on the Young's modulus Y, high-field conduction and pre-breakdown currents. The electric strength FB of PE was found to be a function of Y, irrespective of cross-linking. It was also found that, over a wide temperature range, a sharp pre-breakdown current increase could not be detected till a time before breakdown of 100 ns, the resolution limit of the measuring system. The results showed that, under the present experimental conditions, thermal breakdown is not applicable to PE over a wide temperature range and that breakdown is initiated by an electronic process which has a very short time lag to breakdown of the order of some tens of ns or less.

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