C_(4)F_(7)N混合气体在40.5kV断路器中的应用研究(一):燃弧特性仿真与灭弧性能评估  

Research on Application of C_(4)F_(7)N Gas Mixture in 40.5kV Circuit Breaker(Part Ⅰ):Simulation and Evaluation of Arc Extinguishing Performance

作　　者：张博雅 周然 郝迈 蒲云杰 李兴文[1] 姜旭 朱凯 邓云坤 ZHANG Boya;ZHOU Ran;HAO Mai;PU Yunjie;LI Xingwen;JIANG Xu;ZHU Kai;DENG Yunkun(State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University),Xi'an 710049,Shaanxi Province,China;Xi'an XD Switchgear Electric Co.,Ltd.,Xi'an 710077,Shaanxi Province,China;Yunnan Electric Power Research Institute,Yunnan Power Grid Co.,Ltd.,Kunming 650217,Yunnan Province,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049 [2]西安西电开关电气有限公司,陕西省西安市710077 [3]云南电网有限责任公司电力科学研究院,云南省昆明市650271

出　　处：《中国电机工程学报》2022年第23期8750-8761,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51825702);陕西省重点研发计划项目(2019ZDLGY18-08);陕西省高校科协青年人才托举计划(20200403)。

摘　　要：C_(4)F_(7)N/CO_(2)混合气体是目前最具潜力的SF6替代气体,进一步研究其灭弧性能对研发新一代环保型气体开关设备意义重大。该系列论文围绕C_(4)F_(7)N/CO_(2)混合气体在40.5kV自能式断路器中的应用开展研究。系列论文(一)在获得气体物性参数的基础上,建立SF6、5%C_(4)F_(7)N/CO_(2)及6%与20%O_(2)含量下5%C_(4)F_(7)N/CO_(2)混合气体在开断31.5kA短路电流过程中的磁流体动力学电弧模型,通过仿真计算得到不同灭弧介质的电弧温度、灭弧室内气压和气流场分布等特性;分析氧气含量对混合气体开断性能的影响规律,最终根据Mayr电弧模型对不同介质的弧后热开断性能进行定量评估。研究表明:C_(4)F_(7)N/CO_(2)混合气体电弧在径向方向扩散速度不如SF6,对膨胀室的加热效果弱于SF6,气吹灭弧效果不明显;5%C_(4)F_(7)N/CO_(2)混合气体的热开断性能约为SF6的31.3%;加入O_(2)可以提升电弧对膨胀室的加热效果,从而提升混合气体的灭弧性能。但是,在现有断路器结构下,C_(4)F_(7)N/CO_(2)混合气体灭弧性能仍与SF6有一定差距。The C_(4)F_(7)N/CO_(2) mixture is the most promising eco-friendly SF6-alternative gas.It is of great significance to further study its arc extinguishing performance for the development of the new generation of eco-friendly gas insulated switchgears.This series of papers focused on the application of C_(4)F_(7)N/CO_(2) gas mixture in a 40.5kV self-blast circuit breaker.After obtaining the physical parameters of the gas media,magnetic fluid dynamics arc models of SF6,5%C_(4)F_(7)N/CO_(2),as well as 5%C_(4)F_(7)N/CO_(2) gas mixture with 6%and 20%O_(2) were established for the 31.5kA short-circuit current breaking process.The distributions of temperature,pressure and flow field in different arcing media were obtained by the simulation.The influence of O_(2) content on the arc extinguishing performance of the gas mixture was analyzed.Finally,the thermal breaking capability of different media during post-arc period was quantitatively evaluated by the Mayr arc model.The results show that the radial diffusion rate of C_(4)F_(7)N/CO_(2) mixture is lower than that of SF6,so the heating effect on the expansion chamber is weaker,and the gas blowing phenomena is not obvious.The thermal breaking capability of 5%C_(4)F_(7)N/CO_(2) mixture is about 31.3%that of SF6.Adding O_(2) can improve the heating effect on the expansion chamber,so as to improve the arc-quenching performance.However,it is still much lower than that of SF6 for the existing circuit breaker.

关 键 词：C_(4)F_(7)N 气体断路器 磁流体动力学仿真 灭弧性能 弧后电流 

分 类 号：TM561[电气工程—电器]