权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Basic Study on Electrical Insulation Property in a New Type Cryogenic Gas Insulated Transmission Line

新型低温气体绝缘输电线路电绝缘性能的基础研究

基本信息

批准号：
08455126
负责人：
HIDAKA Kunihiko
金额：
$ 4.61万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455126/
关键词：
Cryogenic temperature Electrical Discharge High Voltage Air Nitrogen Electrical Insulation Charge Quantity Paschen's Law 送電路

项目摘要

An intensive study on electrical insulation property in a cryogenic gas space is required for realizing a gas insulated transmission line and an electric power equipment using a high temperature super conductor. Electrical breakdown characteristics in a non-uniform field gap such as a rod-to-plane electrode which is stressed by lightning or switching impulse voltage are first investigated in a cryogenic gas space of -180 degrees Celsius provided by a cryostat. Secondly, electrical breakdown voltages of a cryogenic and uniform field gap of more than 100 mm whose data have not been so far accumulated are measured using a large cryostat of 1 m^3 in volume. Main results obtained form these studies are summarized as follows.1) The breakdown voltage of a non-uniform field gap in air at room temperature becomes higher in the order, for lightning impulse, switching impulse and dc voltages. On the other hand, the value at cryogenic temperature becomes in the reverse order.2) The breakdown voltage of a non-uniform field gap in nitrogen gas hardly depends on either temperature or voltage waveform. It mainly depends on the tip radius of a high potential rod electrode and it increases with increasing radius.3) The charge produced due to corona discharge strongly depends on the occurrence voltage of the corona. the charge observed at -180 degrees Celsius becomes smaller than that observed at room temperature for the same corona occurrence voltage.4) The breakdown voltage of a sphere-to-sphere gap of 150 mm in diameter increases linearly with increasing gap length up to 100 mm and tends to saturate over the gap length of 100 mmfor all voltage waveforms of dc, ac and impulse. In the region of the linear relationship, it is confirmed that the Paschen's law holds true for cryogenic temperature.

为了实现使用高温超导体的气体绝缘输电线路和电力设备，需要深入研究低温气体空间的电绝缘性能。在由低温恒温器提供的-180摄氏度的低温气体空间中，首先研究了非均匀场隙中的电击穿特性，例如受到雷电或开关脉冲电压应力的棒对面电极。其次，使用体积为1 m^3的大型低温恒温器测量了100 mm以上的低温均匀场间隙的击穿电压，这些数据迄今尚未积累。从这些研究中获得的主要结果总结如下。1)室温下空气中非均匀场隙击穿电压对雷击、开关冲击、直流电压依次增大。另一方面，低温下的数值则相反。2)氮气中非均匀场隙的击穿电压几乎不受温度和电压波形的影响。它主要取决于高电位棒电极的尖端半径，并随着半径的增大而增大。3)电晕放电产生的电荷与电晕的发生电压有很大关系。对于相同的电晕发生电压，在-180摄氏度下观察到的电荷比在室温下观察到的电荷小。4)对于直径为150mm的球隙，击穿电压随间隙长度的增加而线性增加，直至100mm，并且在100mm的间隙长度以上，直流、交流和脉冲电压波形的击穿电压趋于饱和。在线性关系的范围内，证实了Paschen定律对于低温是成立的。