Many research works have proved that it is viable to predict the radio interference (RI) of high-voltage alternating current transmission lines by corona cage test. However, it is uncertain whether the same method can be adopted for RI prediction of high-voltage direct current (HVDC) transmission lines, since the corona performance of HVDC lines is obviously affected by the widely distributed space charge. In this study, the detailed corona current characteristics, such as the current pulse amplitude, rise time, half-wave time, and repetition frequency are systematically studied by the reduced-scale experiment and the relationship between the average corona current and the RI excitation current is confirmed. Furthermore, based on the experimental study, a method for predicting the RI level of HVDC transmission lines by the corona cage test is proposed. The RI level of a ±800 kV bipolar HVDC transmission line is predicted and compared with the measured result, which verifies the validity of the proposed method.

许多研究工作已经证明，通过电晕笼测试预测高压交流输电线路的无线电干扰（RI）是可行的。但是，由于高压直流输电线路的电晕性能明显受到空间电荷分布的明显影响，因此不确定是否可以采用相同的方法进行高压直流输电线路的RI预测。在这项研究中，通过缩小实验以及平均电晕电流与RI励磁电流之间的关系，系统地研究了详细的电晕电流特性，例如电流脉冲幅度，上升时间，半波时间和重复频率。被确认。此外，根据实验研究，提出了一种通过电晕笼测试预测高压直流输电线路RI水平的方法。对±800 kV双极高压直流输电线路的RI水平进行了预测，并与测量结果进行了比较，验证了所提方法的有效性。