The traditional medium-voltage distribution network fault location method uses mainly the voltage and current measurements of the medium-voltage side, which results in problems such as high installation costs at the measuring points and complicated postoperation and maintenance work. Therefore, a fault location idea based on the distributed measurement of low-voltage side voltage is proposed in this paper. First, the characteristic voltage is adaptively selected according to the fault type. Second, the suspected fault section is determined by comparing the characteristic voltage amplitude of each measuring point. Third, the fault section is located using the section unit characteristic voltage drop defined for each suspected fault section. Finally, fault distance estimation is achieved based on the voltage difference matrix and characteristic voltage analysis. This method achieves accurate fault distance identification based on the distribution difference of the characteristic voltage of the low-voltage side under the fault state. This work provides a new economical and practical idea for determining the fault locations of distribution networks. The effectiveness of this method is evaluated by considering a 10 kV distribution network in Guangdong Province built in PSCAD/EMTDC.

中文翻译：

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基于低压特征电压的配电网故障距离估计方法

传统的中压配电网故障定位方法主要采用中压侧电压、电流测量，存在测点安装成本高、后期运维工作复杂等问题。因此，本文提出基于低压侧电压分布式测量的故障定位思路。首先，根据故障类型自适应选择特征电压。其次，通过比较各测点的特征电压幅值来确定疑似故障区段。第三，使用为每个可疑故障部分定义的部分单元特征电压降来定位故障部分。最后根据电压差矩阵和特征电压分析实现故障距离估计。该方法根据故障状态下低压侧特征电压的分布差异，实现准确的故障距离识别。该工作为确定配电网故障位置提供了一种经济实用的新思路。以PSCAD/EMTDC中建设的广东省10 kV配电网为例，评估了该方法的有效性。