Study of improvement of electrical social environment on the electromagnetic field generated with high density electric energy transportation.

本研究是在1998年4月至2001年3月的三年中进行的，目的是改善高密度电能传输产生的电磁波干扰的电气环境。研究结果总结如下：(1)在单相GIL模型的情况下，发现由于铝壳内部和外部之间的涡流循环，GIL周围的磁场并没有被铝壳减小。另一方面，在三相GIL模型的情况下，发现铝壳使GIL周围的磁场减小，因为大部分涡流出现在铝壳的内部，并流向外壳的反面。(2)通过测量不同导体结构的磁场密度，计算了三相GIL模型附近的ELF磁场。结果表明，与…相比，三相GIL附近的极低频磁场明显减小用有限元方法分析了直立在绝缘圆板上的人体模型的电流密度分布，阐明了这种内部电流密度分布的特点。(4)轴对称人体模型。这些计算导致了不接地人体模型内部电流密度特性的量化。实验结果验证了Kaune等人报道的三维微型人体模型实验结果的充分性。(5)为了分析电晕放电的基本特性，采用了沃尔什变换和小波变换的方法。(6)为了发展高压电力系统的故障诊断技术，采用自组织映射方法(SOMM)和神经网络(NN)相结合的方法，获得了不同绝缘条件下的交流电晕放电模式。研究表明，基于神经网络的SOM故障诊断技术是电力系统故障诊断的有效方法。(7)研究了基于电磁波法的电力设备电晕定位故障诊断技术的发展。通过分析电磁波从电晕放电点到电晕放电点的延迟时间的差异，实现电力设备电晕位置的检测。结果表明，这种监测技术对于低水平电晕的探测和定位是一种非常有价值的方法。(8)为了了解金属喷涂层材料的屏蔽效应，采用屏蔽室进行了测量。在纸上喷涂金属涂层的情况下，衰减几乎达到了测量极限，尽管金属和材料的附着力对屏蔽效能的特性有很大的影响。较少

This study carried out during the past three-years from April, 1998 to March, 2001.An aim of this study is to improve the electrical environment on electromagnetic wave interference generated with transport of high density electric energy.The obtained results are summarized as follows :(1) In case of single-phase GIL model, it was found that the magnetic field around the GIL is not reduced by the aluminum enclosure, since the eddy current circulates between inner and outer parts in the aluminum enclosure. Other hand, in case of three-phase GIL model, it was found that the mamnetic field around the GIL are reduced by aluminum enclosure, since most of the eddy current appears at inner part in the aluminum enclosure and flows to the opposite side of enclosure.(2) ELF magnetic field near three-phase GIL model was evaluated by measuring magnetic flux density for various conductor configurations. As the results, ELF magnetic field near three-phase GIL was considerably reduced comparing with … More single-phase one.(3) The finite element method is applied to the analysis of current density distributions in a human model which stands with erect position on the insulating circular plate, and the characteristics of such internal current density distributions are clarified.(4) In axisymmetrical human model. The calculations lead to the quantification of the characteristics of the internal current density inside an ungrounded human model. The results have demonstrated the adequacy of the experimental results reported by Kaune etal who used an 3-dimensional miniature human model.(5) The walsh and wavelet transformation method was used in order to analyzed for purpose deducing basic characteristics or the fluctuation corona discharge. The obtained results are correlated with previous findings and theories of negative pulse corona discharges.(6) To develop the failure diagnosis techniques for HV power system, we have investigation to obtain the AC corona discharge pattern with different insulating analysis by using Self Organization Map Method (SOMM) with Neural Network (NN). It was indicated that the SOMM with NN was an effective technique for a Failure Diagnosis of the power system.(7) Investigation was carried out for the development of the failure diagnosis technique by locating of corona in electric power installation using the electromagnetic wave method. By analyzing the difference of delay times of electromagnetic wave from corona discharge point, the detecting of the corona location in electric power installation can be realized. The obtained results are shown that this monitoring technique was an extremely valuable for detection and location of the low level corona.(8) In order to understand shielding effect of materials using the metal spray coatinm technique, measurements have been performed using shielded enclosure. In case of paper sprayed coating with metal, the attenuation was almost shows the measurement limit, and it is though that adhesion of metal and the material influenced strongly characteristics of shielding effectiveness. Less