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1996年5月20日,我在供电所值班.下午2时接到张弓西某台区报告,报告说:该台区配变计量箱内冒烟,向外渗油,并带有刺鼻的焦味.时值打麦用电,我立即赶到现场.打开计量箱发现,低压侧A相与铝排对接的母线接头绝缘层被烧焦,并从A相接线柱向外渗油.松开A相压线铜螺母发现.连接母线的铝排与压线铜垫接触处已严重锈蚀,并被烧变形.检查分析 铜螺栓、压线铜垫与接线铝排长期在空气中氧化.生成了一层不易导电的铜铝氧化层.这几天恰是用电高峰,这种氧化层在强电流的作用下发热,引起接触电阻增大;电阻增大,又进一步引起接触点发热.长时间发热引起的高温又使瓷套管的上密封胶垫烧缩龟裂,引起向外渗油.当温度升到一定值时,向外渗出的变压器油就会冒烟燃烧.处理 重新更换一个密封胶垫,把渗出的油用布
I was on duty at the power station on May 20, 1996. At 2 pm, I received a report from a certain area in Zhangjiagang West and reported that there was smoke in the metering area of the station, oil leaked out and pungent Burned, when the value of wheat power, I immediately rushed to the scene. Open the metering box found that the low-voltage side of the aluminum busbar docking phase A insulation is scorched and out of the oil leakage from the phase A terminal Open the A phase pressure brass nut found aluminum connection bar and the pressure pad copper pad contact has been severely corroded and burned deformation inspection and analysis of copper bolts, pressure wire copper pad and wiring aluminum long-term oxidation in the air. A layer of non-conductive copper and aluminum oxide layer. These days is the peak of electricity, the oxide layer in the role of strong current heating, causing the contact resistance increases; resistance increases, and further cause the contact point fever. The high temperature caused by the heat causes the upper sealing gasket of the ceramic sleeve to shrink and crack, causing the oil to leak outwards. When the temperature rises to a certain value, the transformer oil exuding outwards will smoke and burn. A sealing pad to ooze the oil with cloth