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Detection and Control of Ion Flow and Space Charge in Equipment for DCUHV Transmission Line and Compartment Gas Insulated Transmission Line

直流高压输电线路和隔室气体绝缘输电线路设备中离子流和空间电荷的检测与控制

基本信息

批准号：
62460113
负责人：
HARA Masanori
金额：
$ 5.31万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

In this work, ion flow field with respect to ion flow electroinjection phenomena under DCUHV lines and breakdown phenomena along the spacer surface in gas insulated system are investigated to find the similarity law in ion flow field and to find optimum electrode and spacer shapes under particle-contaminated condition in the gas insulated system.The results can be summarized as follows.1) The similarity law in ion flow field is clarified and formulated to find a control method of ion flow field and apply information on ion flow field obtained in an experimental setup to another setup with a different size.2) Particle-initiated breakdown characteristics of conical spacers are measured and fundamental parameters determining the breakdown voltage of a dielectric spacer contaminated by metallic particles is found.3) Breakdown mechanism along the spacer surface contaminated by a metallic particle is confirmed. That is, with shorter particles the discharge threshold field strength is higher than the field for the discharge propagation and the breakdown voltage is determined by the discharge threshold conditions, and with larger particles the relationship reverses.4) Three methods for the improvement of insulation performance of particle contaminated spacer are proposed.:metal insert method, recessed electrode method and shield ring method. It is confirmed by the experiment that the proposed metal insert method is the best one and rises the breakdown voltage as high as about 50% in air and about 30% in SF_6 gas.

在这项工作中，本文研究了DCUHV线下离子流场与离子流电注入现象以及气体绝缘系统中隔离层表面沿着击穿现象之间的关系，以寻找气体绝缘系统中离子流场的相似规律，并寻找颗粒污染条件下的最佳电极和隔离层形状，其结果可概括如下：1）阐明了离子流场的相似律，并将其公式化，以找到离子流场的控制方法，并将在实验装置中获得的离子流场信息应用于具有不同尺寸的另一装置。测量了锥形间隔层的起始击穿特性，找到了决定金属颗粒污染的介质间隔层击穿电压的基本参数。击穿机制沿着由金属颗粒污染的间隔物表面被确认。也就是说，当颗粒较短时，放电阈值场强高于放电传播场强，击穿电压由放电阈值条件决定，而当颗粒较大时，两者关系正好相反。4）提出了改善颗粒污染间隔层绝缘性能的三种方法：金属插入法、凹进电极法和屏蔽环法。实验结果表明，金属插入法是最佳的方法，在空气中击穿电压提高了50%左右，在SF_6气体中提高了30%左右。