| 基于小波变换的母线保护CT暂态饱和实时检测方法 |
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| 引用本文： | 张方军. 基于小波变换的母线保护CT暂态饱和实时检测方法[J]. 广东电力, 2009, 22(5): 37-39 |
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| 作者姓名： | 张方军 |
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| 作者单位： | 浙江机电职业技术学院,电气工程系,杭州,310053 |
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| 摘 要： | 在分析电流互感器（current transformer，CT）暂态饱和特性的基础上，根据CT饱和电流信号存在奇异性的特征，采用小波变换定量计算出CT进出饱和点的时刻，在进入饱和点后闭锁保护，而在出饱和点后开放保护，以提高保护的动作可靠性和速度，并对其进行了仿真，结果表明该方法可以准确测量出CT发生饱和和退出饱和的时刻，避免引起保护发生误动作。
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| 关 键 词： | 电流互感器饱和 小波变换 饱和母线保护 |
Real-time Measuring Method for Transient Saturation of Current Transformer Based on Wavelet Transform in Busbar Protection |
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| ZHANG Fang-jun. Real-time Measuring Method for Transient Saturation of Current Transformer Based on Wavelet Transform in Busbar Protection[J]. Guangdong Electric Power, 2009, 22(5): 37-39 |
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| Authors: | ZHANG Fang-jun |
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| Affiliation: | ZHANG Fang-jun (Dept. of Electric Engineering, Zhejiang Inst. of Mechanical and Electrical Engineering, Hangzhou 310053, China) |
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| Abstract: | Based on analyzing the transient saturation characteristics of current transformer （CT） and according to the strangeness of CT saturated current signal, the time when CT enters and exits the saturation point is figured out quantitatively by wavelet transform. The protection is locked out after entering the saturation point and opened after exiting the saturation point, thus enhancing the operational reliability and speed of protection. Simulation results show that the method enables accurate measurement of the time when CT enters and exits saturation and prevents misoperation of protection. |
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| Keywords: | saturation of current transformer wavelet transform saturation busbar protection |
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