Research for the Impact of MCB Bimetallic Trip on the Overload Protection Characteristics
The thermal overload breaking mechanism of MCB is analyzed.The three-dimensional solid model of the bimetallic strip institutions and the coupling mathematical model of electro-thermal-structure for miniature circuit breaker (MCB) are established in this paper.The temperature rise curve and thermal equilibrium position of bimetallic strip are obtained through the simulation which works in the known material properties conditions, like nominal resistivity and elastic coefficient.And then, voltage and current waveform of bimetallic strip is monitored in overload breaking process through testing.The temperature field distribution and displacement field distribution before and after degradation were obtained by conducting electric-heat-structure coupling simulation on bimetallic strip with ANSYS, which is based on the experimental current.The minimum force the bimetallic strip needs to push the lock rod and the time it needs from preheating to pushing the lock are also researched.The effect of bimetallic strip degradation on MCB breaking characteristic is analyzed.
thermal overload protection characteristics bimetallic strip degradation
Fang Yao Qianyun Yao Zhigang Li
Hebei University of Technology, Tianjin, 300130 Electrical Apparatus Institute of Hebei Province Tianjin, China
国际会议
温州
英文
285-289
2014-11-16（万方平台首次上网日期，不代表论文的发表时间）