AgSnO_2电触头分合电弧伏安特征  

Arc V-I Characteristics of AgSnO_2 Electric Contact

作　　者：金钰 周晓龙[2] 刘方方 

机构地区：[1]中国能源建设集团云南省电力设计院有限公司,云南昆明650051 [2]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2017年第6期58-61,共4页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南电网有限责任公司220kV福贡串补工程;国家自然科学基金项目(51361016)

摘　　要：变电站中断路器、隔离开关的辅助开关在动作过程中,电接触材料的接触起弧是制约电器稳定性的关键因素.文章探讨了反应合成法制备的AgSnO_2电触头起弧过程中的伏安特征,同时结合了电弧的功率特征、电触头起弧后表面形貌特征,触头抗熔焊性能.结果表明:材料在电流大于20A,开关在闭合和断开过程中电弧瞬态电阻不稳定,电弧功率明显增加,抗熔焊力波动较大.通过对大于此电流作用后的材料表层特征分析表明起弧使得电接触材料表面的能量集中,高温造成材料的分解,起弧与阴阳极材料转移密切相关,因此电弧的伏安特征是用来衡量材料起弧的临界依据.The characteristic of arc in electric contact material of circuit breaker and disconnect switch auxiliary switch in substation are the key factor in the influence of the device. In this paper, the V - I characteristics of AgSnO2 electric contact material in arcing were analyzed, together with the arc power characteristics, the anti - fusion welding and the features of the contact material after arc action. The experimental results show the transi- ent resistance was unstable under 20A no matter in the status of closing or disconnect process, meanwhile the arc power and the force of anti - fusion welding increased. The surface features after the action of higher current show the arc gave rise to the energy concentration and the decomposition and loss of materials. So the arcing is associated with the transfer between anode and cathode. Thus V - I characteristics of the arc are the determinant factor to evaluate the material stability.

关 键 词：电接触开关 伏安特征 电弧功率特征 氧化 

分 类 号：Q819[生物学—生物工程]