Finite Element Analysis Of Rough Contact,temperature Rise Characteristics And Experimental Study On Continuous Fittings

In order to content the needs of mechanical and electrical performance,and to ensure reliable operation of the connector during the expected service life,various electrical connectors have been continuously developed,and the connecting fitting was one of the widely used ones.As a hot technology for distribution line operation,the connecting fitting has achieved a certain degree of success in the actual field.However,in recent years,as the increase demand for users' electricity,the reliability of the connecting fitting has been severely challenged.When the current flowed through the surface of the contact,contact resistance was generated.If the contact resistance is too large,the contact area is heated up sharply,the metal fitting severe overheating failure.In this paper,the 10 kV high-voltage cable puncture clamp connection fitting with model specification "JJC10-240/150" was studied.Combined with the relevant theory,the finite element simulation tool and contact resistance measured experiment are used to analyze some characteristics of the fitting under different conditions.Therefore,it provides a theoretical reference for the design,processing and installation of the actual connecting fitting.The specific research contents on this paper include:(1)For the condition on metal surface actually processed by the fitting,two surface contact models with roughness were established,the structural simulation of the contact between the rough solid and the smooth solid was carried out,and the applied pressure and roughness were analyzed.The results show that under the condition of large pressure and low roughness,the rough model produces the largest real contact area.In practical applications,the contact resistance is smaller.(2)The model of the puncture clamp was established by using three-dimensional software,and it was imported into WORKBENCH for the thermal-electric coupling analysis.The clamp's temperature distribution of different working currents was obtained,and the two processing roughness of the contact were explored.It is found that the larger current and rougher contact surface will make the working clamp warm faster,and it's maximum temperature is larger.In practice,the line load should be reduced,and the processing precision of the contact parts should be improved to ensure the metal fittings' operate reliably.(3)The contact resistance measured experiment of the puncture clamp was designed.The influence about installation torque?wire specification and current heatingon the contact resistance was analyzed.It was found that the puncture depth had a great influence on the contact resistance when the clamp was working,and the influence of the puncture angle were smaller.The temperature rise also increases the contact resistance of the clamp.The shortcomings of the current design and installation process of the clamp are summarized,and the reliability scheme of the clamp is proposed at the end of this paper.