低熔点合金在电连接头中的应用性能研究

Study on Application Performance of Low Melting Point Alloy in Electrical Connector

针对输配电线路电连接头发热导致能源损耗甚至引发事故的问题,文中研究了低熔点合金在电连接头中的应用性能。选用在铜界面上润湿性较好的低熔点合金Sn-3.5Ag、Sn-1.6Cu、Sn-Zn-0.7Cu,设计其在电连接中的连接工艺并制作试样。利用ERESCO MF4便携式X光机判断连接后界面的可靠性,再搭建SLQ-2000A升流实验系统并模拟实际工况。最后,测试了低熔点合金和电力复合脂试样在额定通流值为180 A时,持续通流时间4 h过程中试件的发热情况。研究结果表明,低熔点合金作为电连接接触面材料后试样的发热量均低于电力复合脂连接试样的发热量。

Aiming at the problem that the transmission and distribution lines are electrically connected to the hair heat and cause energy loss,the application performance of low melting point alloys in electrical connectors was studied.Low-melting alloys Sn-3.5Ag,Sn-1.6Cu,and Sn-Zn-0.7Cu with good wettability at the copper interface were selected and a joining process in the electrical connection was designed and constructed.The reliability of the interface after connection was judged by using the ERESCO MF4 portable X-ray machine.The SLQ-2000A up-flow experimental system was established and the actual working conditions were simulated.Finally,the low-melting alloy and electric composite grease samples were tested for the heat generation of the test piece during the continuous flow time of 4 hours at a rated flow rate of 180 A.The experimental results showed that the calorific value of the low melting point alloy as the electrical connection joint material is lower than the calorific value of the electric composite grease joint sample.