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(2)不同金属的膨胀效应不同。钢制螺栓的金属膨胀pL要比铜质、铝质母U小得多Q尤其是螺栓型设备接_在运行中随着负荷甉|及温度的变化Q其铝或铜与铁的膨胀和收~程度将有差异而生蠕变,也就是金属在应力的作用下~慢的塑性变形,蠕变的过E还与接头处的温度有很大的关pR实践证明,当接头处的运行工作温度超q?0℃时Q接头金属将因过热而膨胀Q接触表面位置错开QŞ成微空隙而氧化。当负荷甉|减小温度降低回到原来接触位置Ӟ׃接触面氧化膜的覆盖,不可能是原安装时金属间的直接接触。每ơ温度变化的循环所增加的接触电阻,会使下一ơ@环的热量增加Q所增加的温度又使接头的工作状况q一步变坏,因而Ş成恶性@环?br />     (3)现场的其它因素,比如可能存在安装修工Z当,如母U在加工、连接、安装过E中Q对母线接触表面处理不到位、不qx、不光滑、没有涂专用电力脂等Q导致有效接触面U减接触电d大而发热?br />     (4)q接部位紧固螺栓压力不当。部分安装或修h员在gq接上认接螺栓拧得愈紧愈好,其实不然。特别是铝质母线Q弹性系数小Q当螺母的压力达到某个界压力值时Q若材料的强度差Q再l箋增加不当的压力,会造成接触面部分变形隆P反而接触面积减少Q接触电d大,从而媄响导体接触效果。选用的导体材料电导率不满求,多数属于g原材料纯度不够?br />     江苏江v自动化系l有限公怸业从事工业自动化控制plc~程,高低压成套电气设备以及微机综合保护装|的生和销?Ƣ迎来电咨询.<br /></p> </div> <style> .title02{background:url(../images/line02.gif) repeat-x left bottom; height:30px;} .title02 span{ background:url(../images/cion04.gif) no-repeat 5px 12px; line-height:30px; padding-left:20px; font-size:14px; color:#212020;} .title02 a{ color:#212020; line-height:30px; padding-right:8px; float:right;} .title02 a:visited{color:#212020;} </style> 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