A procedure for space charge measurements in full-size HVDC extruded cables

M. Marzinotto, G. Mazzanti
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引用次数: 8

Abstract

This paper proposes a procedure for space charge measurements in full-size HVDC extruded cables, that consists in a detailed protocol indicating voltage polarity, time intervals between measurements, volt-on and volt-off conditions, and so on. The proposed protocol accounts for the experimental practices of such kind of measurements in terms of poling time, depolarization time, heating and cooling of specimens. Such procedure seems particularly useful for assessing the space charge behaviour in terms of electric field of a cable that has undergone a prequalification test. The measurement can also give indication about the possibility of avoiding the repetition of prequalification tests and/or type tests in the case of HVDC cables, for which the Laplacian field profile cannot be taken - strictly speaking - as a reference for comparing the electrothermal stress level of new realizations with that of previously manufactured cables.
全尺寸高压直流挤压电缆空间电荷测量程序
本文提出了一种在全尺寸高压直流挤压电缆中进行空间电荷测量的程序,该程序包括一份详细的协议,表明电压极性、测量时间间隔、开、关电压条件等。该方案从极化时间、去极化时间、试样的加热和冷却等方面考虑了此类测量的实验实践。这种程序对于评估经过资格预审测试的电缆在电场方面的空间电荷行为似乎特别有用。该测量还可以表明,在高压直流电缆的情况下,避免重复资格预审试验和/或型式试验的可能性,严格地说,不能将拉普拉斯场剖面作为比较新实现与以前制造的电缆的热应力水平的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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