刘琴, 谢雄杰, 胡伟, 刘泰蔚, 罗晓庆, 叶奇明. 油绝缘典型电极放电产气特性对比分析[J]. 中国电力, 2021, 54(12): 186-194. DOI: 10.11930/j.issn.1004-9649.202106003
引用本文: 刘琴, 谢雄杰, 胡伟, 刘泰蔚, 罗晓庆, 叶奇明. 油绝缘典型电极放电产气特性对比分析[J]. 中国电力, 2021, 54(12): 186-194. DOI: 10.11930/j.issn.1004-9649.202106003
LIU Qin, XIE Xiongjie, HU Wei, LIU Taiwei, LUO Xiaoqing, YE Qiming. Comparative Analysis on Discharge Gas Production Characteristics of Typical Electrodes with Oil Insulation[J]. Electric Power, 2021, 54(12): 186-194. DOI: 10.11930/j.issn.1004-9649.202106003
Citation: LIU Qin, XIE Xiongjie, HU Wei, LIU Taiwei, LUO Xiaoqing, YE Qiming. Comparative Analysis on Discharge Gas Production Characteristics of Typical Electrodes with Oil Insulation[J]. Electric Power, 2021, 54(12): 186-194. DOI: 10.11930/j.issn.1004-9649.202106003

油绝缘典型电极放电产气特性对比分析

Comparative Analysis on Discharge Gas Production Characteristics of Typical Electrodes with Oil Insulation

  • 摘要: 少油类设备内部通过填充绝缘油进行内部绝缘,因内部空间小,在发生放电或过热故障时,会引起绝缘油关键参量劣化而产生大量H2、烃类气体、CO和CO2等油中溶解气体,故障严重时会导致设备爆炸,损失巨大。设计了一种少油类设备放电试验系统,获得了放电后油中气体扩散特性,开展了典型缺陷所对应的3种典型电极(板板电极、球球电极(球纯油球、球纸板球)和针板电极)在不同间隙距离、不同放电时间下的产气量对比研究,研究结果表明:板板电极放电下,直接加压至击穿产气量较小,球球电极和针板电极放电产生的C2H2和H2呈现饱和趋势,在相同的间隙距离和放电时间下,针板电极产气量最大,球球电极次之,产气量最小的是板板电极,在1 mm间隙下,球纯油球较球纸板球布置下的电极放电过程剧烈,产气量大。获得了3种典型电极油中放电气体含量变化规律,主要结论对于少油类设备产气下的故障分析具有重要的意义。

     

    Abstract: The oil-less equipment is internally insulated by filling with insulating oil. The discharge or overheating faults may cause the degradation of insulating oil, consequently producing a large amount of dissolved gases such as H2, hydrocarbon gas, CO and CO2, and equipment explosion may occur in severe cases due to the small internal space, resulting in huge economical loss. Therefore, a discharge test system is designed for oil-less equipment to obtain the gas diffusion characteristics in the oil after discharge. A comparative study is conducted on the gas production for three typical electrodes, including the plate-plate electrode, ball-ball electrode and needle-plate electrode, with different gap distances and different discharge time. The research results show that under plate-plate electrode discharge, the gas produced by direct pressurization to breakdown is small in volume; the content of C2H2 and H2 produced by the ball-ball electrode and needle-plate electrode discharge tends to be saturated; under same gap distance and discharge time, the needle-plate electrode produces the largest volume of gas, followed by the ball-ball electrode, and the plate-plate electrode produces the least; at 1mm gap, the discharge process of ball pure oil ball is more intense than that of ball paperboard ball with large gas production. The variation characteristics of the discharge gas content in three typical electrode oils are thus obtained. The reached conclusions have great significance for the fault analysis of oil-less equipment under gas production.

     

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