基于零序电压定相比幅的消弧线圈调谐新方法

A new tuning method of arc suppression coil based on the zero-sequence voltage fixed phase and compared amplitude

为了方便简单地测量消弧线圈接地系统中线路的对地参数,提出了一种基于零序电压定相比幅的消弧线圈调谐新方法。该方法是在配电网中性点增加消弧线圈及电阻,在并入电阻之前,先测量出零序电压相位,并入电阻之后,配合消弧线圈的进一步调节,直到与并入电阻前零序电压相位相同(并入电阻前后避开谐振点)。测量出零序电压幅值,代入公式即可精确地求出线路对地总电容与总电阻。最后,利用Mbatlab搭建模型进行实验仿真。该方法具有操作简单、精度较高等优点,对消弧线圈调谐有重要意义。

In the arc suppression coil grounding system,in order to facilitate the measurement of the line＇ s parametersto ground,a new tuning method for arc suppression coil was proposed based on the zero-sequence voltage fixed phase and compared amplitude.In this method,the arc suppression coil and resistor are added at the neutral point of the distribution network.Before incorporating the resistor,the phase of the zero-sequence voltage should be measured firstly; after incorporating the resistor,the arc suppression coil inductance value should be further adjusted to make sure that the zero-sequence voltage phase of the neutral point is identical with the measured one before （to avoid resonance point）.The total capacitance and resistance to ground in power distribution network can be accurately obtained by using the formula with the measured zero-sequence voltage amplitude.Finally,the Matlab simulation model was built to verify this tuning method.It was proved that this method has the advantages of simple operation,high accuracy etc.; and it is significant to the arc suppression coil tuning.