电流互感器饱和检测的混合算法及其工程实现
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摘要
由于铁心的非线性励磁特性,电力系统中配置的铁磁式电流互感器易受外部因素影响发生磁饱和,从而导致一次电流无法正常传变,这既可能引起保护装置对系统运行状态的错误判断,也在一定程度上反映着电流互感器(TA)设备性能的变化。为准确识别TA饱和并深入分析设备发生饱和的规律,对基于TA饱和的谐波与波形特征而提出的一种谐波比和分段积分法相结合的TA饱和检测混合算法进行了深入的探讨。并针对混合算法在实际工程应用中面临的多种技术问题,结合现场的大量录波数据,对混合算法进行改进以完善其工程实用性。算例分析表明,改进后的混合算法既能有效识别TA饱和,又利于利用录波数据快速准确收集TA饱和信息,为评价TA性能及分析饱和发生规律创造了条件。
Due to the non-linear excicttion characteristics of the core, the ferroelectric current transformer arranged in the power system is susceptible to magnetic saturation due to external factors, which leads to the inability of the primary current to pass normally. This may cause the wrong judgment of the operating condition of the protection device, But also to a cerctin extent, reflects the changes in TA equipment performance. In order to accurately identify TA saturation and analyze the law of equipment saturation, based on the preliminary work, based on the TA saturation of the harmonic and waveform characteristics, a harmonic ratio and segmencttion integration method of TA saturation detection hybrid algorithm is discussed. Aiming at the various technical problems faced by the hybrid algorithm in the practical engineering application, combining with the large number of recorded dact, the hybrid algorithm is improved to improve its engineering practicability. The results show that the improved hybrid algorithm can effectively recognize TA saturation and facilictte the rapid and accurate collection of TA saturation information by using the recorded dact, which creates the conditions for evaluating TA performance and analyzing the law of saturation.
Due to the non-linear excicttion characteristics of the core, the ferroelectric current transformer arranged in the power system is susceptible to magnetic saturation due to external factors, which leads to the inability of the primary current to pass normally. This may cause the wrong judgment of the operating condition of the protection device, But also to a cerctin extent, reflects the changes in TA equipment performance. In order to accurately identify TA saturation and analyze the law of equipment saturation, based on the preliminary work, based on the TA saturation of the harmonic and waveform characteristics, a harmonic ratio and segmencttion integration method of TA saturation detection hybrid algorithm is discussed. Aiming at the various technical problems faced by the hybrid algorithm in the practical engineering application, combining with the large number of recorded dact, the hybrid algorithm is improved to improve its engineering practicability. The results show that the improved hybrid algorithm can effectively recognize TA saturation and facilictte the rapid and accurate collection of TA saturation information by using the recorded dact, which creates the conditions for evaluating TA performance and analyzing the law of saturation.
引文
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[3]张庆伟,赵翔,谭建成.基于多阶导数配合的CT饱和检测[J].电力系统保护与控制,2008,36(5):10-13.ZHANG Qingwei,ZHAO Xiang,TAN Jiancheng.Multiple derivatives based CT saturation detection method[J].Relay,2008,36(5):10-13.
[4]张新刚,王泽忠.采用电压波形特征的电流互感器饱和检测方法[J].电网技术,2005,29(14):59-63.ZHANG Xingang,WANG Zezhong.A method detecting current transfmorer saturation by utilizing features of secondary voltage waveform[J].Power System Technology,2005,29(14):59-63.
[5]林森,陈斌.一种基于相关分析的CT饱和检测方案[J].电力科学与工程,2011,27(3):55-58.LIN Sen,CHEN Bin.One scheme of CT saturation detection based on correlation analysis[J].Electric Power Science&Engineering,2011,27(3):55-58.
[6]王志鸿,郑玉平,贺家李.通过计算谐波比确定母线保护中电流互感器的饱和[J].电力系统及其自动化学报,2000,12(5):19-24.WANG Zhihong,ZHENG Yuping,HE Jiali.A algorithm to distinguish current transformer’s saturation by calculating the harmonics ratio of branch current[J].Proceedings of The EPSA,2000,12(5):19-24.
[7]李贵存,刘万顺.利用小波原理检测电流互感器饱和新方法[J].电力系统自动化,2001,25(5):36-39.LI Guicun,LIU Wanshun.A new method for detecting saturation of current transformer based on wavelet transform[J].Automation of Electric Power Systems,2001,25(5):36-39.
[8]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南[M].北京:中国电力出版社,2004.