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发明公开
CN109061384A 一种配电网单相接地故障相辨识方法及系统 有权

一种配电网单相接地故障相辨识方法及系统
摘要：
本发明公开了一种配电网单相接地故障相辨识方法及系统，本发明在发生接地故障时，在中性点不接地或消弧线圈欠补偿接地状态下，若某一相电压在故障后的电压幅值小于故障前电压的幅值、且故障后该相电压相位超前于故障前电压相位，则判定该相为故障相；在消弧线圈过补偿接地状态下，若某一相电压在故障后电压幅值小于故障前电压的幅值、且故障后该相电压相位滞后于故障前电压相位，则判定该相为故障相；在消弧线圈全补偿状态下，若某一相电压在故障后电压幅值小于故障前电压的幅值、且非故障相电压幅值大于相应相故障前的电压幅值，则判定该相为故障相。本发明能够有效解决不平衡电压对接地故障相辨识的影响，在实际中易于实现，故障相辨识正确率高。
摘要（英）：

The invention discloses an identification method and system for a single-phase earth fault phase of a power distribution network. According to the identification method and system, when an earth faultoccurs, and a neutral point is not earthed or an arc suppression coil is in an under-compensation earthing state, if the voltage amplitude of one certain phase voltage after a fault is smaller than the amplitude before the fault, and the phase position of the phase voltage after the fault is ahead of the phase position before the fault, it is identified that the phase is a fault phase. When the arc suppression coil is in an overcompensation earthing state, if the voltage amplitude of one certain phase voltage after the fault is smaller than the amplitude of the voltage before the fault, and the phase position of the phase voltage after the fault is lagged behind the phase position before the fault, it is identified that the phase is a fault phase. When the arc suppression coil is in a full compensation state, if the voltage amplitude of one certain voltage after the fault is smaller than the amplitude of the voltage before the fault, and the voltage amplitude of a non-fault phase is larger than the voltage amplitude of the corresponding phase before the fault, it is identified that the phase is a fault phase. The identification method and system and effectively avoid the influenceof unbalanced voltages on identification of earth fault phases, are easy to implemented in actual use, and have high fault phase identification accuracy.

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