中文摘要：

我国中压配电网中性点多采用不接地或经消弧线圈接地方式，单相接地（小电流接地）时故障选线和定位困难，长期以来现场实用效果均不理想。接地故障瞬间存在明显的暂态过程，暂态信号包含了丰富的故障位置信息。介绍了利用暂态信号的小电流接地故障选线技术，以及基于配电网自动化（DA）系统的暂态故障分段定位技术。暂态检测技术可靠性高、适应性好、无安全隐患，已在现场获得成功应用。

英文摘要：

The neutral point of medium voltage distribution systems are almost isolated or grounded via Petersen coil in China. With great difficulty, the faulty feeder selection and faulty section location under the single-phase earth fault have poor practice effect. There is a distinct transient process after the occurrence a fault which contains detailed fault position information. The transient signals based faulty feeder selection and the transient faulty section location technologies based on Distribution Automation system are introduced in this paper. With high reliability, excellent adaptability and safety, the detection technologies based on transient signals have already been applied onsite successfully.