基于二次电流包络检测器的CT饱和检测新方法

N. Chothani, V. Sharma
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引用次数: 4

摘要

提出了一种基于波形识别技术的电流互感器饱和检测新方案。利用一阶系统和电流波形包络线斜率计算了饱和时二次电流的变化。电流包络线的斜率大小可能取决于饱和度的高低。根据电流包络线的特性及其斜率大小,可以估计出CT的饱和程度。采用PSCAD/EMTDC软件包生成CT饱和状态下的故障数据,并在MATLAB软件中实现算法。采用截止频率为400hz的低通一阶巴特沃斯滤波器平滑CT二次电流。考虑了剩余磁通、负载电阻和直流偏置的存在等参数对算法进行了验证。仿真结果表明了该方法在不同系统条件下检测CT饱和度的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new method for CT saturation detection using secondary current envelope detector
This paper presents a new Current Transformer (CT) saturation detection scheme which is based on the waveform identification technique. The variation of secondary current at the time of saturation has been carried out using first order system and slope of current waveform envelope. The slope magnitude of current envelope may depend on low to high degree of saturation. Based on characteristic of current envelope and its slope magnitude, level of CT saturation can be estimated. The fault data with CT saturation condition are generated using the PSCAD/EMTDC software package and algorithm is implemented in MATLAB software. A low-pass, first order Butterworth filter with cutoff frequency of 400 Hz is used to smoothen the CT secondary current. Various parameters such as remanent flux, burden resistance and presence of DC offset are considered for the validation of the proposed algorithm. The simulation results show the effectiveness of the proposed method to detect CT saturation under varying system condition.
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