The research on the relationship between reduction in the higher harmonic noise in the power and role of the integration protective grounding.

降低电源高次谐波噪声与一体化保护接地作用关系的研究

• 批准号: 15560255
• 负责人: MAKITA Tetsuo
• 金额: $ 1.15万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560255/
• 关键词: protective grounding; structure grounding; global earthing; equipotential bonding; electromagnetic environment; electromagnetic induction interference; internal lightning protection; electric potential distribution

In this study, following five matters were examined.First, referring to the perpendicular two-layer composition ground, new electrometer method in search of the electric potential distribution of grounding electrode circumference and grounding resistance was developed. This calculation method obtained by examining the conventional result of the researcher it.Second, grounding resistance value of earth electrode is measured by the fall-of-potential method. However, laying in the ground conductor that does not intend the grounding exists in the circumference of the measuring electrode. In this study, the effect of this laying in the ground conductor on measurement result was examined.Third, the international consistency of the standard variously was promoted, and the TN system would be adopted. Though the potential difference does not appear between equipment, because it becomes the one point grounding in the TN system, the earth faulting current becomes the short-circuit current in order to connect the protection conductor with neutral conductor and identical point. Moreover, by using the neutral conductor as medium, the unnecessary current may do the gyre. Then, merit and demerit of the TN system was examined.Fourth, it is important to know electrical characteristics of the concrete, when the structure grounding scheme was adopted. In this study, the relationship between water content and electrical resistivity of the concrete was clarified.Fifth, on the impedance characteristic of earth electrode, the following was examined. The method effectively recycled in making the FRP that is the industry waste wood to be the earth electrode material, was studied. That is to say, by mixing carbon fine particle and coagulating agent into the FRP as an ultra fine particle condition, the new earth electrode material was developed.

本文主要研究了以下五个方面的问题：第一，针对垂直双层复合接地，提出了一种新的静电计法，用于研究接地极圆周电位分布和接地电阻。这种计算方法是通过检验研究者的常规结果而得出的。其次，采用电位降法测量接地极的接地电阻值。然而，在测量电极的周围存在不打算接地的接地导体。在本研究中，考察了接地导线的铺设对测量结果的影响。第三，从多方面促进了标准的国际一致性，并将采用TN系统。虽然设备之间不存在电位差，但由于TN系统成为一点接地，接地故障电流成为短路电流，以便将保护导体与中性线和同一点连接。此外，通过使用中性导体作为介质，不必要的电流可能会做回旋。第四，在采用结构接地方案时，了解混凝土的电气特性是非常重要的。在本研究中，明确了混凝土的含水量与电阻率之间的关系。第五，关于接地极的阻抗特性，进行了以下研究。研究了工业废弃木材玻璃钢作为接地极材料的有效回收利用方法。也就是说，通过在FRP中混入碳细颗粒和分散剂作为超细颗粒状态，开发了新型接地极材料。