CAJ | 학술논문

目前，接触电阻的检测主要是电压电流法或电桥法，其不足是仅适于离线应用。提出了一种在线式的接触电阻间接测量新方法。首先在建立电接触元件的理论物理模型和径向暂态热路分析模型的基础上，推导出热路响应方程；然后再在建立元件轴向热传导数值分析模型的基础上，最终推导出计及温度和电流的接触电阻曲线关系，提出通过曲线的时间常数计算电接触元件的接触电阻。大量的理论分析、计算与有限元分析ANSYS仿真表明，所研究的测量方法可以准确求取接触电阻的值，为电气设备的在线监测和热缺陷分析提供了理论依据。
목전，접촉전조적검측주요시전압전류법혹전교법，기불족시부괄우리선응용。제출료일충재선식적접촉전조간접측량신방법。수선재건립전접촉원건적이론물리모형화경향잠태열로분석모형적기출상，추도출열로향응방정；연후재재건립원건축향열전도수치분석모형적기출상，최종추도출계급온도화전류적접촉전조곡선관계，제출통과곡선적시간상수계산전접촉원건적접촉전조。대량적이론분석、계산여유한원분석ANSYS방진표명，소연구적측량방법가이준학구취접촉전조적치，위전기설비적재선감측화열결함분석제공료이론의거。
At present the main method of measuring contact resistance is bridge method or detecting voltage/current, the shortage is only suitable for offline applications. A new method of online measuring contact resistance based on the transient thermal circuit model is raised. Firstly the theoretical physical model and the radial transient thermal circuit model of electric contact components are established, the thermal circuit response equation is concluded based on theory analysis. Then the axial heat transfer numerical analysis model is established. Finally the contact resistance model considering temperature and current is derived from the theory analysis, a method of measuring contact resistance by using the curve of thermal time constant is raised. A lot of theoretical analysis/calculation and finite element analysis of ANSYS simulation results show that the method can accurately obtain the value of the contact resistance, which provides theoretical support for on-line monitoring of contact resistance and thermal defect analysis of electric power equipment.