纯油间隙典型缺陷放电气体特性比较研究

Qin Liu, Tai-Hung Liu, Xiongjie Xie, Xiaoqing Luo, Wei Hu, Qiming Ye
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引用次数: 0

摘要

无油设备通过填充绝缘油实现内部绝缘。当发生放电或过热故障时,由于内部空间小,会产生大量的H2、碳氢气体、CO和CO2等溶解气体。严重时可引起爆炸,造成巨大的经济损失。为此,本文设计了一套无油设备放电试验系统。首先,得到了排气后气体在油液中的扩散特性。其次,研究了板-板电极、球-球电极和针-板电极三种典型电极下的产气试验。最后,获得了不同间隙距离和充电时间下的试验数据。研究结果表明,在板对板电极放电条件下,直接加压击穿产生的气体较少。在连续放电过程中,瓦斯产量随间隙距离的增加而增加。在放电5s、10s和15s下,6mm间距下的H2含量分别是3mm的9.2倍、5.9倍和7.6倍。随着放电时间的增加,6mm节距下球电极的C2 H2含量和H2含量逐渐增加。气体浓度增加后,球电极和针板电极放电产生的C2 H2和H2呈饱和趋势。三种电极放电均表现出气产量随放电间隔和放电时间的增加而增加的规律。在相同放电时间下,针板电极产气量最大,球电极次之,板电极产气量最小。得到了三种典型电极油放电气体含量的变化规律。对采气条件下无油设备的故障分析具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative Research on Discharge Gas Characteristics of Typical Defects in Pure Oil Gap
The oil-less equipment is internally insulated by filling with insulating oil. When a discharge or overheating failure occurs, there is a phenomenon that a large amount of H2, hydrocarbon gas, CO and CO2 and other dissolved gases can be produced because of the small internal space. These can cause a explode in severe cases, resulting a huge economical loss. Therefore, a discharge test system for oil-less equipment is designed in the paper. Firstly, the gas diffusion characteristics in the oil after discharge is obtained. Secondly, the gas production test is studied under three typical electrodes, including the plate-plate electrode, ball-ball electrode and needle-plate electrode. Finally, the data of the test is obtained ats at different gap distances and charge time. The research results show that under plate-to-plate electrode discharge, the gas produced by direct pressurization to breakdown is small. The gas production increases with the increase of the gap distance during continuous discharge. The H2 content under 6mm pitch is 9.2 times, 5.9 times and 7.6 times larger than 3mm under discharge of 5s, 10s and 15s, respectively. The C2 H2 content and H2 content of the ball electrode under 6mm pitch gradually increase with the increase of discharge time. After the gas concentration increases, the C2 H2 and H2 generated by the discharge of the ball electrode and the needle plate electrode show a saturation trend. The three electrode discharges all show the law that the gas production increases with the increase of the discharge interval and discharge time. At the same discharge time, the needle plate electrode has the largest gas production volume, followed by the ball electrode, and the plate electrode has the smallest gas production volume. The change law of the discharge gas content in three typical electrode oils is obtained in the paper. There is a great significance for the failure analysis of oil-less equipment under gas production.
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