中文摘要：

针对带并补电抗输电线路的三相重合闸,提出了一种利用模型识别的三相重合前无故障识别方法。以熄弧后瞬时性故障模型作为无故障识别基准模型,利用测量精度高的并联电抗器电流计算各模分量模型中电抗器电流与电容电流之和,由模相变换得到各相电流之和实现无故障识别。瞬时性故障熄弧后即无故障时,实际模型与基准模型一致,三相电流之和均为0;故障未消失时,由于故障回路的存在,故障相电流之和不为0,能够进行故障相别的确认。该方法不依赖于故障选相,能够实现三相重合前无故障的可靠识别,对于未消失故障尤其是实质永久故障能够避免盲目重合,同时能够识别故障相。ATP仿真结果验证了该方法的正确性和有效性,有利于提高三相重合闸重合成功率。

英文摘要：

A non-fault discrimination method based on model recognition before three-phase reclosing is proposed for transmission lines with shunt reactors. The method takes the π-type equivalent model in the arc extinct transient fault as the reference. Either in transient faults without arc or in arcing transient faults even permanent faults, the method uses current of shunt reactors, which has high precision, and calculates the sums of the mode components of shunt reactors currents and capacitive currents at both terminals based on the reference. According to the phase-model transformation matrix, a formula is developed for summing the currents of shunt reactors and capacitive currents to implement the non-fault detection. In the case of a transient fault with the extinction arc namely the non-fault condition, the sums of currents in each phase are all zeros because the actual fault model is consistent with the reference. However, in the case of an arcing transient fault or a permanent fault, the sums of the currents in the fault phases are non-zero because of the fault branch, while the sums of the non-fault phases are close to zero due to an arc extinction transient fault. Meanwhile, the fault phase can be confirmed as well based on the sums of the currents in the fault phases. It is noted that the presented non-fault detection is independent of fault phase selection and is able to detect non-fault condition reliably before three-phase reclosing, which is helpful to avoid blind reclosing and identify the fault phase for the arcing faults especially serious permanent faults. Moreover, we have verified the correctness and effectiveness of this non-fault detection method through numerical simulation and have proved that the method is helpful to increase successful reclosing rate of three-phase reclosures.