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

本研究从1998年4月至2001年3月进行，旨在改善高密度电能传输时产生的电磁波干扰的电气环境，研究结果如下：（1）在单相GIL模型下，发现铝外壳并没有降低GIL周围的磁场，因为涡流在铝外壳的内外部分之间循环。另一方面，在三相GIL模型的情况下，发现GIL周围的磁场被铝外壳降低，因为大部分涡流出现在铝外壳的内部，并流向外壳的另一侧。(2)通过测量不同导体结构的磁通密度，对三相GIL模型附近的ELF磁场进行了评估。结果表明，三相GIL附近的ELF磁场与 ...更多信息 单相1 (3)本文用有限元法分析了人体模型直立于绝缘圆板上的电流密度分布，阐明了人体模型内部电流密度分布的特点。(4)在轴对称人体模型中。的计算导致量化的内部电流密度的特性内的一个未接地的人体模型。这些结果证实了Kaune等人用三维微型人体模型所报道的实验结果的正确性。(5)采用沃尔什变换和小波变换的方法，对脉动电晕放电进行分析，从而推断出脉动电晕放电的基本特征。所得结果与负脉冲电晕放电的理论和实验结果相一致。(6)为发展高压电力系统故障诊断技术，研究了采用神经网络自组织映射方法（SOMM）获取不同绝缘分析下交流电晕放电模式的方法。结果表明，SOMM与神经网络相结合是一种有效的电力系统故障诊断技术。(7)对电力设备电晕定位故障诊断技术的发展进行了研究。通过分析电磁波在电晕放电点处的延迟时间差，实现了对电力设备电晕位置的检测。结果表明，这种监测技术对低水平电晕的探测和定位是非常有价值的。(8)为了了解金属喷涂技术中材料的屏蔽效应，在屏蔽室中进行了测量。在纸喷涂金属涂层的情况下，衰减几乎显示出测量极限，并且金属和材料的粘附强烈影响屏蔽效能的特性。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