绝缘气体对开关柜内部故障燃弧压力上升的影响*

doi:10.11985/2020.02.002

电气工程学报 ›› 2020, Vol. 15 ›› Issue (2): 11-17.doi: 10.11985/2020.02.002

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绝缘气体对开关柜内部故障燃弧压力上升的影响^*

李美^1,²(),王一玮¹,李林¹,郭鹏程¹

1.西安理工大学西北旱区生态水利国家重点实验室西安 710048;
2.常熟开关制造有限公司常熟 215500

收稿日期:2020-01-08 出版日期:2020-06-25 发布日期:2020-07-31
作者简介:李美,女,1986年生,博士,讲师。主要从事电力开关设备在线监测及开关柜内故障电弧的研究工作。E-mail:dl_limei@stu.xjtu.edu.cn
基金资助:
* 国家自然科学基金(51807162);陕西省教育厅科研计划(18JK0566);中国博士后基金项目(2018M641007)

Influence of Insulating Gas on Pressure Rise due to Internal Fault Arcing in Switchgear

LI Mei^1,²(),WANG Yiwei¹,LI Lin¹,GUO Pengcheng¹

1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048 China;
2. Changshu Switchgear MFG. Co., Ltd., Changshu 215500 China

Received:2020-01-08 Online:2020-06-25 Published:2020-07-31

摘要/Abstract

摘要：

针对密闭开关柜内故障燃弧问题,研究了不同绝缘气体对密闭腔体故障电弧引起的压力特性的影响。比较分析了空气、SF₆、CO₂和N₂四种不同绝缘气体情况下的压力上升、电弧电压、电弧注入能量和辐射能量的变化。基于标准计算方法计算了热传递系数,并定量分析了不同绝缘气体故障电弧的热传递系数变化规律。结果表明,相同电弧能量注入情况下,SF₆引起的压力上升最小,而空气的则最高;最大压力上升和注入的电弧能量几乎成线性增长关系;对于同一电流,CO₂的电弧电压最高,而SF₆的则最低;随着充气压增大,SF₆电弧辐射占焦耳热比重增大;而对于CO₂、N₂和空气,辐射占焦耳热比重反而趋于减小。随着充气压减小,空气、CO₂和N₂的热传递系数都趋于减小,而SF₆的热传递系数则趋于增大。

关键词: 开关柜, 故障燃弧, 压力上升, 绝缘气体

Abstract:

In view of the issue on fault arcing in an enclosed switchgear, the influence of different insulating gases on pressure characteristic due to fault arc in an enclosed tank is investigated experimentally. The developments in pressure rise, arc voltage, injected arc electrical energy and radiation energy are compared and analyzed under the condition of air, SF₆, CO₂ and N₂. With the thermal transfer coefficient determined based on standard calculation method, the variation of thermal transfer coefficient is analyzed quantitatively for different insulating gases. The results show that the pressure rise is lowest if SF₆ is used as filling gas and highest for air at the same arc electrical energy. The maximum pressure rise almost increases linearly with injected arc electrical energy. Regarding arc voltage, it is highest for CO₂ whereas is lowest for SF₆at the same current. As the filling pressure rises, the fraction of arc radiation to input Joule heating increases for SF₆while it tends to fall in the case of CO₂, N₂ and air instead. As the filling pressure decreases, the thermal transfer coefficient for air, CO₂ and N₂all reduces. Inversely, it tends to increase in SF₆.

Key words: Switchgear, fault arcing, pressure rise, insulating gas

中图分类号:

TM591

李美, 王一玮, 李林, 郭鹏程. 绝缘气体对开关柜内部故障燃弧压力上升的影响^*[J]. 电气工程学报, 2020, 15(2): 11-17.

LI Mei, WANG Yiwei, LI Lin, GUO Pengcheng. Influence of Insulating Gas on Pressure Rise due to Internal Fault Arcing in Switchgear[J]. Journal of Electrical Engineering, 2020, 15(2): 11-17.

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绝缘气体对开关柜内部故障燃弧压力上升的影响^*

Influence of Insulating Gas on Pressure Rise due to Internal Fault Arcing in Switchgear

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