基于温升试验的特高压换流站通流回路接头端子接触电阻经验公式参数推导研究

Research on Parameter Deduction in Contact Resistance Empirical Formula of Contact Terminal in Converter Station Based on Large Current Temperature Rise Test

随着直流输电容量的不断提升,对换流站金具通流容量,载流的可靠性、耐热性提出了更高的要求.2014年以来,多个直流特高压工程换流站接头金具发生过热现象,对输电可靠性造成了严重影响.换流站中的通流回路金具承担着全电流的传输作用,其运行电流大、工作电压高、散热条件较差,因此,亟需对金具发热开展深入的研究工作,确保特高压电网的安全稳定运行.本文基于特高压换流站通流回路接头端子大电流温升试验结果,以铜-铜接触端子为例,完成了相关接触电阻经验公式参数推导研究,同时基于推导的参数开展了仿真计算,并将仿真结果与试验数据进行了比较验证.本研究为今后仿真计算接触电阻模型的计算提供了一种有效的方法.

The improvement of DC transmission capacity proposes a higher request on the discharge current capacity,current-carrying reliability and heat resistance of valve hall fittings. Since 2014, more and more over- heating phenomena of contact terminals in converter station have been observed which caused serious impact on the transmission reliability. In DC transmission project,valve the fittings which operate with large current, high working voltage and poor heat dissipation, undertake the function of electrical connection,so it is essential to carry out in-depth research work on overheating problems. Taking the copper-copper terminal as the test piece, the research on parameter deduction in contact resistance empirical formula has been finished in this paper based on the large current temperature rise test. From the comparison between calculated results and test results, the contact resistance empirical formula agrees favorably with experimental results, so as to provide an effective method in contact resistance calculation in the later numerical simulation.