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高精度电流互感器检测注意事项
Publisher:admin Time:2013-7-9 17:04:31 Click:4139
1、检定电流互感器时,标准电流互感器与被检电流互感器的电流比必须相同。
2、严格按照图中所给出的线路接线。
3、检定互感器之前,须先测试负荷箱是否准确。
4、检定过程中,严禁二次绕组开路。
5、检定互感器之前需先退磁,退磁线路如图4所示。
6、在图4中,二次开路,均匀缓慢调节调压器,使百分表指示由0增至100%,然后均匀且缓慢地降至零。重复这一过程2~3次。退磁完毕后切断电源之前,应将二次绕组短接。
7、带升流器电流互感器的接线原理图与上述的接线图大致相同,只是升流器的输出绕组与互感器的一次绕组是同一绕组,其余均相同。
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