智能变电站中电流互感器实时响应性能研究

Research on Real-time Response Performance of Current Transformer in Intelligent Substation

互感器作为智能变电站中的关键设备之一,其实时响应性能的好坏直接决定了后续继电保护设备能否正确有效地动作.针对目前电流互感器的测量线圈因偏心导致实时测量结果不准确,而影响设备实时响应性能的问题,设计了一种基于环形磁场传感阵列的电流互感器.其采用嵌入了磁场传感器的环形线圈作为传感头,并将含铁芯的线圈作为标准线圈对环形磁场传感阵列线圈进行校准,以降低一次导体的偏心影响,从而改善测量准确度.且针对目前积分算法普遍精确度不高的问题,设计一种高精度的积分算法,能有效提高电流互感器测量准确度,改善设备的实时响应性能.

Transformer is one of the key equipments in the intelligent substation; its accuracy of real time response performance determines whether the subsequent relay protection equipment can perform correctly and effectively. The measurement coil of CT is not accurate due to bias, which affects the real time response performance of equipments. To solve this problem, in the paper, a CT based on the circular magnetic field sensor array is designed, which uses a ring coil embedded in the magnetic field sensor as the sensor head; the coil with iron core is used as the standard coil to calibrate the loop magnetic field sensing array coil to reduce the eccentricity of a conductor. A high precision integral algorithm is designed to improve the accuracy of CT , which can effectively improve the real time response performance of the equipment.