Rockwell Allen-Bradley 1756-OF8 1756-TBNH
开关柜内部实际温升情况，尤其是母排连接等部位，通常总是比型式试验测出的数据高。主要有以下几点原因：
(1) 型式试验测得数据通常是在试验室完成的，持续时间不长，通常不超过8 h，不具备温升累积效应，不能等同于长期运行并持续发热的设备。
(2) 不同金属的膨胀效应不同。钢制螺栓的金属膨胀系数要比铜质、铝质母线小得多，尤其是螺栓型设备接头，在运行中随着负荷电流及温度的变化，其铝或铜与铁的膨胀和收缩程度将有差异而产生蠕变，也就是金属在应力的作用下缓慢的塑性变形，蠕变的过程还与接头处的温度有很大的关系。实践证明，当接头处的运行工作温度超过80℃时，接头金属将因过热而膨胀，使接触表面位置错开，形成微小空隙而氧化。当负荷电流减小温度降低回到原来接触位置时，由于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。每次温度变化的循环所增加的接触电阻，将会使下一次循环的热量增加，所增加的温度又使接头的工作状况进一步变坏，因而形成***循环。
(3) 连接部位紧固螺栓压力不当。部分安装或检修人员在导体连接上认为连接螺栓拧得愈紧愈好，其实不然。特别是铝质母线，弹性系数小，当螺母的压力达到某个临界压力值时，若材料的强度差，再继续增加不当的压力，将会造成接触面部分变形隆起，反而使接触面积减少，接触电阻增大，从而影响导体接触效果。
(4) 选用的导体材料电导率不满足要求，多数属于导体原材料纯度不够。
(5) 现场的其它因素，比如可能存在安装检修工艺不当，如母线在加工、连接、安装过程中，对母线接触表面处理不到位、不平整、不光滑、没有涂专用电力脂等，导致有效接触面积减少接触电阻增大而发热。
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