电力复合脂分油率对接头端子温升的影响

Influence of Oil-separation Rate of Electric Compound Grease on Temperature Rise of Terminal Connectors

为了研究电力复合脂分油率对接头端子搭接部位温升的影响,在分析不同分油率电力复合脂对接头端子温升影响机理的基础上,对涂不同分油率电力复合脂的接头端子分别进行了试验研究及有限元计算,并建立了接头端子温升预测模型。研究结果表明:接头端子搭接部位的温升随时间呈指数上升趋势;分油率<3%的电力复合脂在常温及交变环境温度作用下均能够保持性能稳定,若接头端子搭接部位的电阻降低8%～14%,则温度降低6%～7%,接头端子温度呈搭接部位低非搭接部位高的分布形式,且该电力复合脂在接头端子搭接部位不均匀分布时其功效会降低;分油率>3%的电力复合脂常温下易发生劣化,在交变环境温度作用下劣化会加速,若接头端子搭接部位的电阻升高8%～47%,则温度升高3%～7%,接头端子温度呈搭接部位高非搭接部位低的分布形式。研究结果可为电力复合脂在特高压直流换流站中的应用提供参考。

In order to study the effect of oil-separation rate of electric compound grease on temperature rise of overlapping parts of terminal connectors,the experimental study and finite element calculation on the terminal connectors with different oil-separation rates were carried out based on the effect mechanism of different oil-separation rates on the temperature rise of terminal connectors,and a temperature rise prediction model of terminal connectors was also established.The research results show that the temperature rise of the terminal connectors increase exponentially with time.The electric compound grease with less than 3%oil-separation rate can keep the performance stable at both room temperature and alternating temperatures,when the resistance of overlapping parts of terminal connectors decrease by 8%~14%,the temperature of overlapping parts of terminal connectors decrease by 6%~7%,and the temperature of overlapping parts of the terminal connectors are lower than that of non-lap parts of the terminal connectors,and the effects of the electric compound grease can be diluted somewhat when it is not evenly distributed at the position of overlapping parts.The electric compound grease with greater than 3%oil-separation rate can tend to deteriorate at room temperature and tend to accelerate degradation under the action of alternating ambient temperatures,the resistance of overlapping parts of terminal connectors increases by 8%~47%,and the temperature of overlapping parts of terminal connectors increase by 3%~7%.The temperature of overlapping parts of the terminal comectors are higher than that of non-lap parts of the terminal comectors.The research results can provide references for the application of electric composite grease in UHVDC converter station.