赵艾萱,陈曦,徐龙,李嘉明,邓军波,张冠军
ZHAO Aixuan,CHEN Xi,XU Long,LI Jiaming,DENG Junbo,ZHANG Guanjun

• 1:电力设备电气绝缘国家重点实验室(西安交通大学)

摘要(Abstract)：

为了提高配电网系统的可靠性,降低运维工作强度,在配电网中的电缆/架空混合线路配置自动重合闸策略的可行性已经逐渐成为关注的重点。然而,在应用自动重合闸策略时,由于电缆是散热薄弱点,因此必须准确掌握整个过程中电缆的热过程,防止电缆因重合闸时的短时大电流导致过热老化甚至起火。在此通过有限元法建立了典型配电电缆的数值模型,研究了断路器失效情况下电缆出现单相接地时线路整体的热积聚过程,并明确了不同重合闸延时时间对电缆热消散过程的影响。通过本研究可以有效明确配置自动重合闸策略情况下配网电缆/架空混合线路的最大允许短路电流和动作时间,完善了自动重合闸策略在配网系统中的应用。
In order to improve the reliability of distribution network system and reduce operation and maintenance intensity, the feasibility of configuring the automatic reclosing strategy for the hybrid cable/overhead line in the distribution network has gradually become the focus of attention. However, in the application of the automatic reclosing strategy the cable is a weak spot for heat dissipation. Therefore, it is necessary to accurately grasp the thermal process of the cable during the entire process and prevent the heat aging or even fire due to the short-time high current during reclosing. In this paper the numerical model of a typical distribution cable is established by the finite element method, and the overall heat accumulation process of the line in the case of single-phase grounding under the failure condition of the circuit breaker is studied, and the influence of different reclosing delay times on the heat dissipation process of the cable is clarified. Through this study,the maximum allowable short-circuit current and operating time of the distribution hybrid cable/overhead line under the automatic reclosing strategy can be effectively clarified, and the application of the automatic reclosing strategy in the distribution network system is improved.

关键词(KeyWords)： 配电电缆;自动重合闸;数值模型;允许电流;混合线路
distribution cable;automatic reclosing;numerical model;allowed current;hybrid line

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司科技项目(5226SX1600U9)

作者(Author): 赵艾萱,陈曦,徐龙,李嘉明,邓军波,张冠军
ZHAO Aixuan,CHEN Xi,XU Long,LI Jiaming,DENG Junbo,ZHANG Guanjun

DOI: 10.19585/j.zjdl.201804001

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