某型252kV自能式SF_(6)断路器不同燃弧时间下的开断性能仿真分析  

Simulation analysis of breaking performance of a self-blast type 252kV SF6 circuit breaker under different arcing times

作　　者：郭瑾 姜旭 GUO Jin;JIANG Xu(College of Electronic Information Engineering,Shaanxi Vocational and Technical College,Xi’an 710038;Xi’an XD Switchgear Electric Co.,Ltd,Xi’an 710077)

机构地区：[1]陕西职业技术学院电子信息工程学院,西安710038 [2]西安西电开关电气有限公司,西安710077

出　　处：《电气技术》2022年第1期29-34,共6页Electrical Engineering

基　　金：陕西省重点研发项目(2019ZDLGY18-08)。

摘　　要：本文基于磁流体理论,采用真实气体模型和动网格模拟,建立252kV自能式SF_(6)断路器的仿真模型,分别进行不同开断电流和不同燃弧时间下的气流场计算。从气体压力曲线变化比较膨胀室的增压情况。在关键区域选取7个监测点,观察气体压力、温度、速度和马赫数的变化特征。40kA、50kA和63kA短路电流下的计算结果表明,在相同电流条件下,短路电流对增压的影响较小,膨胀室的气体压力增量接近;气流场、气体压力的分布和燃弧时间的关系更密切;燃弧时间越长,气体压力的上升幅度越大;在电流最终过零时刻,较大短路电流下的温度远高于较小电流。因此,为满足市场需求,应根据大电流开断条件下长燃弧时间的性能进行更多的改进。Based on the MHD theory,a simulation model for 252kV self-blast SF_(6) circuit breaker is established in this paper using the real gas model and the dynamic mesh method.The gas flow field at different breaking currents and different arcing times are acquired respectively.The pressurization in the expansion chamber is compared on emphasis from the angles of contours and curves.Seven analysis points at the key area are chosen for observing the variation characteristics of gas pressure,temperature,velocity and Mach number.The calculation results under 40kA,50kAand 63kA currents show that the pressurizations are affected little by the breaking currents at the same current conditions,the increments of gas pressure are close at the expansion chamber.The distributions of gas flow field and the pressurizations are more related to the arcing times.More rising of gas pressure can be obtained with the long arcing time.Furthermore,the differences of the temperature are bigger at the larger current than that at the small current.So,more improvements should be carried out according to the long arcing time period under large current interruption for meeting the market demand.

关 键 词：SF_(6)断路器 电弧等离子体特性 燃弧时间 开断仿真 

分 类 号：TM561.3[电气工程—电器]