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Study on Measurement of Space Charge Distribution in DC Power Cable

直流电力电缆空间电荷分布测量研究

基本信息

批准号：
05452179
负责人：
TAKADA Tatsuo
金额：
$ 2.94万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452179/
关键词：
Spade Charge DC Power Cable Viscoelastic Loss attenuation of Pressure Pulse Wave 海底電力ケーブル直流絶縁

项目摘要

Pulsed electro-acoustic method, which is able to measure space charge distribution accumulated in cvlindral power cable insulation, has been developed in our laboratory. The purpose of this research is to improve the spatial measurement resolution of space charge distribtion within 5%. To achieve this purpose, the following techniques have been developed.(1) Low impendance, high voltage nanosecond pulse generatorHg reed relay, the high voltage swich, is used to protect from the chattering noise. Fast response, high voltage divider has been improved by arranging the divider impendances in a coaxial array. Furthemore, the high voltage pulse generator are wholly shielded in a metal box to protect from electro-magnetic noises. As the results, the expected the high voltage, nanosecond pulse generator (rising time : 3ns, pulse width : 50ns, peak value : 4kV) has been developed.(2) Detection of nanosecond pressure pulse waveTo improve the spatial measurement resolution, pizeo-electrical polymer (PVDF : thickness of 4-9 mum) has been used to detect the pressure pulse wave. In this case, the pressure pulse wave propagates in multi-layr materials. The acoustic impendance of every material has been measured and the optimum acoustic matching of multi-layr materials has been made. As the results, the primary purpose of the spatial measurement resolution within 5% of space charge distribution has been achieved.

本实验室开发了脉冲电声法，能够测量圆柱形电力电缆绝缘中积累的空间电荷分布。本研究的目的是将空间电荷分布的空间测量分辨率提高到5%以内。为了实现这一目的，我们开发了以下技术。(1)低阻抗、高压纳秒脉冲发生器汞簧片继电器，即高压开关，用于防止颤振噪声。通过将分压器阻抗排列在同轴阵列中，快速响应的高压分压器得到了改进。此外，高压脉冲发生器完全屏蔽在金属盒中，以防止电磁噪声。据此，研制出了预期的高压纳秒脉冲发生器（上升时间：3ns，脉冲宽度：50ns，峰值：4kV）。（2）纳秒压力脉冲波的检测为了提高空间测量分辨率，采用压电聚合物（PVDF：厚度为4-9μm）来检测压力脉冲波。在这种情况下，压力脉冲波在多层材料中传播。测量了每种材料的声阻抗，并进行了多层材料的最佳声学匹配。结果，实现了空间测量分辨率在空间电荷分布5%以内的初步目的。