无传感器接触器断开时间在线检测  

Sensorless Online Opening Time Estimation of Contactors

作　　者：张长坤 许志红[1] ZHANG Changkun;XU Zhihong(Fujian Province University Engineering Research Center of Smart Distribution Grid Equipment(Fuzhou University),Fuzhou 350108,Fujian Province,China)

机构地区：[1]智能配电网装备福建省高校工程研究中心(福州大学),福建省福州市350108

出　　处：《中国电机工程学报》2022年第10期3805-3814,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51707039);福建省2018科技创新领军人才资助项目(00387024)。

摘　　要：该文提出一种利用线圈电流估计接触器断开时间的无传感器在线检测方案。在检测过程中,通过控制线圈电压,将包含动铁心位移信息的感应电势转换为线圈电流;根据线圈电流波峰与触头刚分时动铁心位移的对应关系,检测断开时间。对应关系可根据动铁心的机械运动和线圈电感变化推理得到。依照对应关系,在线圈驱动电路中配置补偿电阻可提高检测精度。相比基于触头电压的断开时间检测方案,所提方案具有更高的检测精度,同时能保留触头系统的断口并满足小体积需求。将检测结果作为反馈量,建立应用案例:延时能够根据断开时间变化自调整的零电流分闸方案。同时,在不同接触器上验证所提方案的可行性。This paper proposed a sensorless online opening time estimation method of contactors based on the coil current.In the proposed method,the electromotive force containing the armature displacement information was converted into the coil current by controlling the coil voltage,and the opening time was estimated according to the corresponding relationship between the coil current peak and the armature displacement when contacts just part.The relationship was deduced theoretically from the mechanical armature motion and the variation of coil inductance.According to the relationship,a compensation resistor was configured in the coil activation circuit to improve estimating precision.Compared with the opening time estimation method based on contact voltage,the proposed method has higher estimating precision,which can keep the fracture of contacts and meet the requirements of miniaturization at the same time.The estimation results can be used as feedback to establish an application example:a zero point-on-wave opening whose delay can adjust automatically according to the change of opening time.The feasibility of the proposed estimation method is proved by an experiment in different contactors.

关 键 词：断开时间 无传感器在线检测 线圈电流 动铁心位移 

分 类 号：TM572[电气工程—电器]