为了实现对计量用电流互感器二次回路状态的准确识别，理论分析了在不同状态下的回路等效电路图，提出基于阻抗特征的电流互感器回路状态监测方法，实现了对不同负荷电流下正常连接、开路和短路状态的准确识别，基于此开发了CT二次回路监测模块，并将其成功扩展应用于专变采集终端中，扩展后的专变终端在现场进行了挂网试运行，结果表明，终端运行稳定，数据上传及时、可靠，可为现场计量设备检修、用电检查提供有力的技术支撑。%In order to identify the secondary circuit state of current transformer used for metrology accurately,the theoreti⁃cal analysis of circuit equivalent circuit diagram under different conditions is carried out,and a new secondary circuit state moni⁃toring method based on the impedance characteristics is proposed. With the method,the accurate identification of the normal connection,open circuit and short circuit states under different loads was realized,and a CT secondary circuit monitoring module was developed. It has been applied to specific change acquisition terminal,whose pilot run was performed on the spot. The re⁃sults of pilot run indicates that the terminal operates reliably,the data upload is timely and reliable,and it can provide powerful technical support for equipment maintenance and electricity inspection.
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