关键词: 主配协同, 差异化保护, 多源校验, 故障自愈, 广域同步, 选线装置, 单令多应

Abstract: To address the bottlenecks in single-phase grounding fault disposal, including the low accuracy of traditional station-end fault line selection devices, prolonged average disposal time, and difficulties in detecting high-resistance/intermittent faults, a precise disposal method based on primary-secondary coordination and multi-source verification is proposed. This method innovatively establishes a three-tier technical framework: Firstly, a differentiated dynamic setting model is established. Based on the neutral point grounding method(ungrounded, arc suppression coil grounded) and line parameters(cable, overhead line length), the zero-sequence current reference value is derived via Kirchhoff's Current Law. By combining transient process analysis, protection setting values are dynamically generated, thereby resolving maloperation issues caused by empirical setting values. Secondly, the master station functionality is enhanced to support rapid decision-making. The four-remote point list is optimized by adding zero-sequence voltage and zero-sequence current remote measurements, and a "Single Command-Multiple Response" waveform transmission mechanism is established with the time reduced from 20 minutes to 1 minutes. An online setting values management module is developed to ensure consistency in multi-source verification. Finally, multi-source spatiotemporal topology verification is achieved by integrating the substation fault line selection device and distribution network terminal, while incorporating traveling wave positioning technology and wide-area synchronous intelligent sensors. Combined with the zero-sequence mutation quantity ratio criterion, this enables spatial topology verification between in-station line selection and out-station segment selection. The 200 faults simulation verification shows that under the transition resistance condition of 0~20 kΩ, the positioning accuracy, high-resistance fault detection rate, and average handling time of this method have significantly improved compared with the traditional method. This method resolves the problem of information isolation in distribution networks through resource integration and logic transformation, thereby providing a standardized technical pathway for high-reliability power supply.

Key words: primary-secondary coordination, differentiated protection, multi-source verification, fault self-healing, wide-area synchronization, fault line selection device, single command-multiple response