红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
11期
3704-3708
,共5页
光纤电流互感器%信噪比%0.2级%比值误差%相位误差
光纖電流互感器%信譟比%0.2級%比值誤差%相位誤差
광섬전류호감기%신조비%0.2급%비치오차%상위오차
optical fiber current sensor%SNR%0.2 accuracy class%current ratio error%phase error
电流比值误差和相位误差是检验互感器的重要指标，噪声对其有较大影响。光纤电流互感器不同于传统电流互感器的重要特征之一即是存在较大噪声，在测量小电流时表现尤为显著，已经成为阻碍光纤电流互感器实用化进程的重要难题。分析了高斯白噪声背景下电流比值误差和电流相位误差的统计特征，研究了0.2S级下电流互感器数字输出信号信噪比所需满足的条件，探讨了电流互感器信噪比的计算方法以及影响信噪比的因素，并设计实验验证了理论分析的正确性。分析表明，为满足0.2S级光纤电流互感器信噪比需达到136，在额定电流以及数据更新率一定的情况下，仅有通过降低噪声以及增加敏感线圈缠绕圈数的方法可以提高系统信噪比。
電流比值誤差和相位誤差是檢驗互感器的重要指標，譟聲對其有較大影響。光纖電流互感器不同于傳統電流互感器的重要特徵之一即是存在較大譟聲，在測量小電流時錶現尤為顯著，已經成為阻礙光纖電流互感器實用化進程的重要難題。分析瞭高斯白譟聲揹景下電流比值誤差和電流相位誤差的統計特徵，研究瞭0.2S級下電流互感器數字輸齣信號信譟比所需滿足的條件，探討瞭電流互感器信譟比的計算方法以及影響信譟比的因素，併設計實驗驗證瞭理論分析的正確性。分析錶明，為滿足0.2S級光纖電流互感器信譟比需達到136，在額定電流以及數據更新率一定的情況下，僅有通過降低譟聲以及增加敏感線圈纏繞圈數的方法可以提高繫統信譟比。
전류비치오차화상위오차시검험호감기적중요지표，조성대기유교대영향。광섬전류호감기불동우전통전류호감기적중요특정지일즉시존재교대조성，재측량소전류시표현우위현저，이경성위조애광섬전류호감기실용화진정적중요난제。분석료고사백조성배경하전류비치오차화전류상위오차적통계특정，연구료0.2S급하전류호감기수자수출신호신조비소수만족적조건，탐토료전류호감기신조비적계산방법이급영향신조비적인소，병설계실험험증료이론분석적정학성。분석표명，위만족0.2S급광섬전류호감기신조비수체도136，재액정전류이급수거경신솔일정적정황하，부유통과강저조성이급증가민감선권전요권수적방법가이제고계통신조비。
Current ratio error and phase error, which are impacted by noise, are fundamental index of current sensor. Compared with conventional current sensor, optical fiber current sensor contains much more noise, thus has lower measurement accuracy for small signal. This has restricting practical use for optical fiber current sensor. Statistical characteristic of current ratio error and phase error under white Gaussian noise was analyzed, so was the standard of signal to noise ratio (SNR) when it can meet 0.2 accuracy class. Furthermore, formula of SNR was deduced and influencing factors of SNR was discussed. Theoretical analysis and experiments indicate that the SNR of optical fiber needs to be 29 dB to meet the demand of 0.2 accuracy class. When the rated current and update rate are confirmed, only reducing noise and increasing the number of loops of optical fiber current sensor can improve SNR.
