Square d NQOD 100 amp PANEL PANELBOARD 208v/120v 240v 3 phase main breaker电流互感器自校线路。
( 3) 标准电流互感器二次回路或被测电流互感器二次回路阻抗超差。
标准电流互感器二次回路阻搞超差时会导致标准电流互感器误差增大, 如果标准电流互感器的误差大到低于被测电流互感器准确度等级两个级别时, 会将标准电流互感器的误差加到被测电流互感器误差中, 由式( 2)和式( 3)可知, , fx= fp + f 0, δx = δp + δ0, 这时f 0和δ0 就不能忽略不计。
Square d NQOD 100 amp PANEL PANELBOARD 208v/120v 240v 3 phase main breaker 被测互感器二次回路阻抗增大, 可直接导致被测互感器误差增大。这时应用电流互感器二次回路测阻抗线路来验证二者的二次回路阻抗是否超差。如图4、图5 所示。
图4被测电流互感器二次回路测阻抗线路。
图5标准电流互感器二次回路测阻抗线路。
4结束语
以上分析了实验室检定电流互感器时可能遇到的问题,并且提出了相应的解决办法, 在日常的检定工作中, 应熟练掌握一般电流互感器的检定原理及检定线路, 对于常用的互感器校验仪, 标准电流互感器, 电流负荷箱应定期检定, 确保检定结果的正确。
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