气液固三相绝缘体系数学物理模型的理论分析与实验验证

doi:10.19595/j.cnki.1000-6753.tces.170285

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摘要电机槽内气液固三相绝缘体系由减薄的云母主绝缘、气液两相的蒸发冷却介质和起固定作用的包绕材料构成,三种材料共同承担线棒的绝缘。基于槽内气液固三相绝缘体系的结构特点,建立绝缘体系的简化物理模型,提出气液固三相绝缘体系相关绝缘参数的数学模型。对与绝缘体系电气特性相关的各参数进行理论分析,讨论固定绝缘厚度、液体主流温度、蒸发冷却介质大容器饱和核态沸腾状态的雅各布数等对气液固三相绝缘体系电容、介质损耗角正切值等绝缘参数的影响。最后利用实际线棒对槽内气液固三相绝缘体系进行绝缘实验研究,验证了数学物理模型理论分析的正确性。

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关键词 ：蒸发冷却技术, 气液固三相绝缘体系, 绝缘参数, 数学物理模型, 绝缘实验

Abstract：Gas-liquid-solid insulation system in stator slot consists of thinned mica insulation, two-phase evaporative cooling medium and wrapping material used to fix stator bar. A simplified physical model of gas-liquid-solid insulation system based on the structural features was established in this paper. On the basis of the physical model, mathematical model of each insulation parameter in the new insulation system was put forward concretely. Furthermore, insulation thickness, mainstream temperature and Jacob number of boiling evaporative cooling medium were identified as relevant influencing factors of the new insulation system. And influence of the abovementioned factors on capacitance and dielectric loss tangent of insulation system was analyzed severally. At last, the correctness of theoretical analysis on mathematical and physics model was validated by insulation test.

Key words： Evaporative cooling technology gas-liquid-solid insulation system insulation parameters mathematical and physical model insulation test

收稿日期: 2017-03-15 出版日期: 2018-05-08

PACS:

TM303.4

通讯作者: 阮琳女,1976年生,研究员,研究方向为电气与电子装备蒸发冷却技术。E-mail：rosaline@mail.iee.ac.cn

作者简介: 刘直男,1990年生,博士研究生,研究方向为汽轮发电机的蒸发冷却技术。E-mail：liuzhi@mail.iee.ac.cn

引用本文:

刘直, 阮琳. 气液固三相绝缘体系数学物理模型的理论分析与实验验证[J]. 电工技术学报, 2018, 33(9): 2097-2104. Liu Zhi, Ruan Lin. Theoretical Analysis and Experimental Verification on Mathematical and Physical Model of Gas-Liquid-Solid Insulation System. Transactions of China Electrotechnical Society, 2018, 33(9): 2097-2104.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.170285 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I9/2097

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