描述
1.电流互感器一次绕组直接接在一次电流回路中,当二次侧开路时,二次电流为零,而一次电流不变,使铁心中的磁通急剧增加达到饱和程度。这个剧增的磁通在开路的二次绕组中产生高电压,直接危及人身和设备的安全。
2.电流互感器二次侧开路的征象包括:零序、负序电流启动的保护装置频繁启动,或启动后不能复归;差动保护启动或误动作;电流表指示不正常,相电流指示减小到零;有功、无功功率表指示减小,电能表走得慢;开路点有时可能有火花或冒烟等现象;电流互感器有较大嗡嗡声等。
以上现象有些不一定同时都发生,决定于开路的二次绕组供给哪些负荷以及开路的具体情况。
3.电流互感器二次侧开路的处理
3.1根据故障现象判断是哪一组二次绕组开路。如果是保护用的二次绕组开路,应立即申请将可能误动的保护装置停用。
3.2检查开路绕组供电的二次回路设备(继电器、仪表、端子排等)有无放电、冒烟等明显的开路现象。
3.3如果没有发现明显的故障,可用绝缘工具(如验电器等)轻轻碰触、按压接线端子等部位,观察有无松动、冒火或信号动作等异常现象。在进行这一检查时,必须使用电压等级相符且试验合格的绝缘安全用具(如戴绝缘手套等)。
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