一起110kV电缆充油式复合套管终端故障分析

Analysis on a 110kV Cable Oil-Filled Composite Casing Terminal Fault

对某一发生故障的110 kV电缆充油式复合套管终端进行解体分析,指出故障原因是金属护套与终端尾管连接处电化腐蚀造成接地不可靠,产生不间断放电,长期放电致使主绝缘老化,最终引起主绝缘击穿,并提出了预防类似故障的对策措施。

The collapse of a failed 110 kV cable oil-filled composite casing terminal is analyzed.The main fault reason is that the unreliable ground connection caused by the electrochemical corrosion of the connection between metal sheath and terminal liner,produces an uninterruptible discharge.As a result,it makes the main insulation aging and causes the main insulation breakdown finally.Preventive measures are put forward to avoid the occurance of similar faults.