The traditional arc suppression coil cannot compensate for the active and harmonic component of the ground fault current nor fully suppress the intermittent arc. For improvement, a novel full compensation method for the ground fault current of resonant grounded systems is proposed. The impedance of the compensation component is calculated based on the phase-to-ground insulation parameters, which are precisely measured by injecting a characteristic current signal at the neutral point. When a ground fault occurs, the faulty phase is identified by the phase angle of the ground fault current. Then, the compensation component is put in between the lagging phase of the faulty phase and ground. The faulty phase voltage is suppressed to zero by the input of the compensation component, and the ground fault current is fully compensated. Simulative results indicate that the phase-to-ground insulation parameters of distribution networks are accurately measured by the proposed method. The proposed full compensation method suppresses the faulty phase voltage rapidly, and all the components contained in the ground fault current are completely compensated reliably. The intermittent-arc ground fault is suppressed effectively without being affected by the fault resistance.

中文翻译：

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一种新型谐振接地系统接地故障电流全补偿方法

传统消弧线圈不能补偿接地故障电流的有功和谐波分量，也不能完全抑制间歇电弧。为了改进，提出了一种新的谐振接地系统接地故障电流全补偿方法。补偿元件的阻抗是根据相对地绝缘参数计算的，这些参数是通过在中性点注入特征电流信号来精确测量的。当发生接地故障时，故障相通过接地故障电流的相角来识别。然后，将补偿元件置于故障相的滞后相和地之间。通过补偿元件的输入，故障相电压被抑制为零，接地故障电流得到充分补偿。仿真结果表明，该方法能够准确测量配电网的相对地绝缘参数。所提出的全补偿方法可以快速抑制故障相电压，并且可靠地完全补偿接地故障电流中包含的所有分量。在不受故障电阻影响的情况下，有效抑制间歇性电弧接地故障。