Research on Faint Ground Fault Detection in Power Distribution Line

配电线路弱接地故障检测研究

基本信息

批准号：
06650473
负责人：
UEDA Ryuzo
金额：
$ 1.22万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650473/
关键词：
ground fault faint ground fault power supply failure rainstorm fineness ground fault detection magnetic field magnetic field sensor detectable resolution リ-ク電流絶縁劣化予防技術磁気センサ高感度化電子回路ノイズコアノイズ -

项目摘要

What has to be achieved in the today's power distribution network is to reduce the interpretation rate of power supply to as low a level as possible, if possible to zero. This study presents a trial for such a requirement and is directed to provide a technique which can be an effective means for finding out faint deterioration in the insulation state of the distribution line. The applicability of the magnetic field sensor which has been developed in our laboratory are discussed and some fundamental problems for improving the detection sensitivity are treated : (i) with respect to such the detection of low level magnetic field, the relationship between the sensitivity and the noise is refined. One trial on this point is performed through the zero phase current detection in three phase ; (ii) on the choice of the core utilized in the sensor the problem of core noise which occupies a large weight in the noise appearing in the sensor output is clarified. Its measurement system is developed and concrete measurement result is presented on two different types of core. Based on this system, we obtain a means for searching the core fit for the sensor ; (iii) on constitution of the sensor circuit a new type of reference voltage generating circuit is presented. This has a possibility of improving the precision of the sensor circuit. These are the technology required for achieving the high detection sensitivity of the sensor. Taking into account them, the reconstitution of the sensor has to be performed. After that the proposed approach will be put into practice by certifying the degree of noise reduction of 60Hz power line magnetic noise rough the field testing.

当今的配电网络必须实现的目标是将供电解释率降低到尽可能低的水平，如果可能的话为零。本研究针对这一要求进行了尝试，旨在提供一种技术，该技术可以成为发现配电线路绝缘状态微弱劣化的有效手段。讨论了本实验室研制的磁场传感器的适用性，并讨论了提高检测灵敏度的一些基本问题：(i)对于这种微弱磁场的检测，灵敏度与磁场强度之间的关系噪音得到改善。针对这一点，通过三相零相电流检测进行了尝试； (ii)关于传感器中使用的磁芯的选择，澄清了磁芯噪声的问题，该噪声在传感器输出中出现的噪声中占据很大比重。开发了其测量系统，并给出了两种不同类型磁芯的具体测量结果。基于该系统，我们获得了一种寻找传感器核心适配的方法； (iii)在传感器电路的构成上提出了一种新型的参考电压产生电路。这有可能提高传感器电路的精度。这些是实现传感器高检测灵敏度所需的技术。考虑到它们，必须对传感器进行重构。之后，通过现场测试验证60Hz电力线磁噪声的降噪程度，将所提出的方法付诸实践。