Bandwidth of Current Transformers
Bandwidth of Current Transformers
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DOI：
10.1109/tim.2008.2006134
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发表时间：
2009-06-01
影响因子：
5.6
通讯作者：
Kazimierczuk, Marian K.
中科院分区：
文献类型：
--
作者：
Kondrath, Nisha;Kazimierczuk, Marian K.
带宽是电流互感器的重要性能参数之一。除了由非正弦波形和谐波引起的不确定性外，变压器需要有足够的带宽来重新生成测量电流。导出了电流互感器的跨置电阻的寄生分量表达式。下截止频率、上截止频率和带宽的近似表达式由相应频率范围内电流探头的等效模型导出。用铁氧体铁芯528T500-4C4电流互感器的实验结果验证了上述表达式的正确性。概述了不同的寄生元件，如磁化电感、漏电感和杂散电容对电流互感器带宽的影响。
Bandwidth is one of the important performance parameters of current transformers. Transformers are required to have adequate bandwidth to regenerate the measured current, apart from uncertainties that are caused by the nonsinusoidal waveforms along with harmonics. An expression for the transresistance of the current transformer in terms of parasitic components is derived. Approximate expressions for lower cutoff frequency, upper cutoff frequency, and bandwidth are derived from the equivalent models of the current probe in the corresponding frequency range. The expressions are validated by experimental results for a current transformer using a Ferroxcube ferrite core 528T500-4C4. An overview of the effects of different parasitic components, such as magnetizing inductance, leakage inductance, and stray capacitance, on the bandwidth of a current transformer is presented.