• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >New diagnostic method of electrical insulation properties based on current integration
【24h】

New diagnostic method of electrical insulation properties based on current integration

机译：基于电流积分的电绝缘性能诊断新方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We developed a compact system for evaluating the deterioration of insulating materials used in high-voltage dc power apparatuses. The developed system can be used for simultaneous determination of three basic parameters important for evaluating the deterioration of high-voltage insulation materials, i.e., conductivity, dielectric constant, and charge accumulation. Charge accumulation, which is detrimental to high-voltage dc electrical apparatuses, such as power devices, transformers, and power cables, can be evaluated using this system. With this system, the charges accumulated are measured by integrating the current through a capacitor inserted between the high-voltage power source and the high-voltage apparatus to be tested. The obtained information is transmitted to the unit placed at ground potential. The evaluation is carried out by comparing the amount of initial charges in the insulating material with that of charges accumulated at a certain time after application of a high voltage. When the ratio of the charges accumulated at time (t) to that of the initial charge is 1, it is assumed that there was no charge accumulation; thus, no deterioration of the insulating material is assumed. However, when the ratio is greater than 1, the insulating material is considered to have deteriorated. Using the evaluation system, we developed, we examined the deterioration of insulating materials used in coaxial cables by exposure to 1) γ-rays and 2) high-temperature conditions. From these two experiments using the developed system, the deterioration of insulating materials was found to have advanced substantially when the charge accumulation ratio exceeded approximately over 2.0.
机译：我们开发了一种紧凑的系统，用于评估高压直流电源设备中使用的绝缘材料的劣化情况。所开发的系统可用于同时确定对于评估高压绝缘材料的劣化重要的三个基本参数，即电导率，介电常数和电荷累积。可以使用此系统评估电荷积累，这对高压直流电气设备（例如功率设备，变压器和电缆）有害。使用该系统，通过对通过插入在高压电源和要测试的高压设备之间的电容器的电流进行积分来测量累积的电荷。所获得的信息被传输到接地电位的单元。通过将绝缘材料中的初始电荷量与施加高压后在特定时间累积的电荷量进行比较来进行评估。当在时间（t）累积的电荷与初始电荷的比率为1时，假定没有电荷累积；因此，将电荷累积到初始电荷中。因此，不会造成绝缘材料的劣化。然而，当该比率大于1时，则认为绝缘材料已经劣化。通过使用评估系统，我们开发了通过暴露于1）γ射线和2）高温条件下来检查同轴电缆中使用的绝缘材料的劣化的方法。从使用开发的系统的这两个实验中，发现当电荷累积比超过大约2.0时，绝缘材料的劣化已大大加剧。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号