Abstract：As a key component of fault current limiter(FCL), metal oxide varistor(MOV) will absorb short-circuit energy during the short-circuit fault in power system, leading to the instantaneous increase of its temperature. The heat transfer ability of air-cooling system is of critical importance for the MOV reliability. Therefore, it is very important to reasonably optimize the ventilation structure of MOV used in power system. In this work, based on the structure design of large capacity MOV performed early and its corresponding experimental researches, two optimization designs of MOV structure(marked by MOV-1 and MOV-2, respectively) are proposed. With CFD principle and finite volume method, the fluid field velocity and temperature distribution of both basic MOV structure and the two optimized ones are systematically calculated and analyzed. It is shown that when compared to basic MOV structure, more heat can be taken away from the optimized MOVs and the decrease of the maximum temperature of the two optimized MOVs is about 35°C and 40°C, respectively, indicating their evident improvement of heat dissipation. In addition, the MOV-2 is obtained by adding the radial air-cooling hole on the basis of the MOV-1, and its heat dissipation is obviously improved, compared to the MOV-1. According to this, a practical MOV-2 was constructed and its temperature increase was experimentally determined. Good agreement between the determined temperature increase and the corresponding theoretical calculations is obtained, showing that the MOV-2 can be implemented in power system and indicating the reliability of the calculations performed in this work.
唐宗华, 谭震宇, 孙树敏, 李庆民. 大容量金属氧化物限压器通风冷却结构优化设计与计算分析[J]. 电工技术学报, 2013, 28(3): 161-170.
Tang Zonghua, Tan Zhenyu, Sun Shumin, Li Qingmin. Calculation and Analysis on Ventilation Structure of Different Optimum Proposals in Large Capacity Metal Oxide Varistor. Transactions of China Electrotechnical Society, 2013, 28(3): 161-170.
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2013, Vol. 28 
