A method and device for locating and ranging a single-phase ground fault of a collector line

By collecting fault data at the feeder terminal, determining the upstream feeder terminal, and calculating the main resonant frequency difference, the high cost of single-phase grounding fault location in the existing technology is solved, achieving accurate location at low cost.

CN116482570BActive Publication Date: 2026-05-29HUNAN WULING POWER TECH CO LTD
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN WULING POWER TECH CO LTD
Filing Date
2023-04-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing single-phase grounding fault location and ranging methods for collector lines require clock synchronization and low-latency data transmission between the start and end terminals of the collector line, which is difficult to apply in practice and has high costs.

Method used

By collecting fault data from each feeder terminal, the upstream feeder terminal is determined. The main resonant frequency is determined using the autocorrelation function of transient zero-sequence voltage or current. An equivalent model of the full-frequency zero-sequence network for a single-phase grounding fault in the collector line is established. The main resonant frequency of the simulated fault point is calculated, and the distance to the fault point is calculated based on the frequency difference.

Benefits of technology

It achieves accurate location of single-phase grounding fault points in the collector wire, reduces location costs, and does not rely on clock synchronization and low-latency data transmission between the start and end terminals.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116482570B_ABST
    Figure CN116482570B_ABST
Patent Text Reader

Abstract

The application discloses a method and device for positioning and ranging a single-phase grounding fault of a power collection line, and relates to the technical field of line grounding fault positioning. The positioning and ranging method comprises the following steps: step S10, determining an upstream feeder terminal of an actual fault point according to fault data collected by each feeder terminal; step S20, determining a main resonance frequency of the actual fault point according to fault data collected by the upstream feeder terminal; step S30, establishing a full-frequency zero sequence network equivalent model of the single-phase grounding fault of the power collection line, and calculating the main resonance frequency of a simulated fault point according to the full-frequency zero sequence network equivalent model of the single-phase grounding fault of the power collection line; and step S40, calculating the distance of the actual fault point relative to the upstream feeder terminal according to the difference between the main resonance frequency of the actual fault point and the main resonance frequency of the simulated fault point. The application utilizes the main resonance frequency of the single-phase grounding fault point collected by the feeder terminal, so that the positioning and ranging of the single-phase grounding fault point of the power collection line can be realized, and the positioning cost is reduced.
Need to check novelty before this filing date? Find Prior Art