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Necessity of Charge Measurement for Radiation Evaluation of Transmission Lines

机译：输电线路辐射评估的充电测量的必要性

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摘要

This paper attempts to arouse people's attention to charge measurement in electromagnetic compatibility, especially when evaluating the radiation of transmission lines (TLs). Usually the total current (or common-mode current) is supposed to represent the potential radiation of a TL system. However, it is proved that the measurement of charge, which is the dual source quantity of current, is also necessary to evaluate radiation in this paper. Only when the current and charge are both obtained, the radiation field could be determined accurately. First of all, it is pointed out that charge information could not be properly obtained by current measurement. Although charge could be derived from current theoretically, the error transferred from current to charge could be great for measurement. Then, the error transferred from current to near field (which reflects the charge distribution) is studied by simulation of a typical TL case. And it is proved that such error could be reduced effectively if current is modified by charge. In addition, another important reason for charge measurement is given as limited measurement points, since the standing waveform on TLs cannot be determined by current only. Finally, a possible method for charge measurement is proposed.
机译：本文试图引起人们注意电磁兼容性的测量，特别是在评估传输线（TLS）的辐射时。通常，总电流（或共模电流）应该表示TL系统的潜在辐射。然而，证明了对本文评估辐射的电荷的测量，即双源电流。只有在获得电流和电荷时，才能精确地确定辐射场。首先，指出，通过电流测量无法正确获得充电信息。尽管从理论上可以从电流衍生电荷，但从电流转移到充电的误差可能很好测量。然后，通过模拟典型的TL案例来研究从电流转移到近场（反映电荷分布）的误差。事实证明，如果电流被充电修改，则可以有效地减少这种错误。另外，给出了电荷测量的另一个重要原因，因为可以仅通过电流确定TLS上的常设波形。最后，提出了一种可能的充电测量方法。

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