The scheme of configuring the Petersen coil after actively measuring the capacitive current of a network has been largely adopted, but the feedback of the compensation state is not usually used. This paper proposes a new method of adjusting the Petersen coil by using the information obtained after arc extinction. Using the equivalent circuit of a single-phase grounding fault in the resonant grounding system, the electrical character are analyzed. It is found that the transient process after arc extinction is the underdamped resonance between the Petersen coil and the capacitance to ground, and the resonant frequency is different from the power frequency. Therefore, the resonant angular frequency and damping ratio of the process after arc extinction can be used to calculate detuning, and the three-phase undervoltage can be used to preliminarily judge whether the system is undercompensated or overcompensated. A method of adjusting Petersen coil to achieve reasonable detuning is given. The effectiveness and accuracy of the theory and the method are supported by simulation and field fault data. The method does not need to add any special equipment or adjust the running state of the existing equipment, and it has high safety.

中文翻译：

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一种利用瞬态信息测量和调整灭弧后谐振接地系统失谐的方法

主动测量网络容性电流后配置消弧线圈的方案已被大量采用，但通常不采用补偿状态的反馈。本文提出了一种利用灭弧后获得的信息来调整消弧线圈的新方法。利用谐振接地系统中单相接地故障的等效电路，对其电气特性进行了分析。发现灭弧后的瞬态过程是消弧线圈与对地电容之间的欠阻尼谐振，谐振频率与电源频率不同。因此，可以利用灭弧后过程的谐振角频率和阻尼比来计算失谐，三相欠电压可以初步判断系统是欠补偿还是过补偿。给出了调整消弧线圈以达到合理失谐的方法。仿真和现场故障数据支持理论和方法的有效性和准确性。该方法不需要增加任何特殊设备，也不需要调整现有设备的运行状态，安全性高。