Power distribution network pilot protection method and system based on synthetic transient mutation amplitude
By adopting a longitudinal protection method based on the amplitude of synthetic transient changes, the problem of detecting phase-to-phase short-circuit faults and high-resistance faults in resonant grounding systems is solved. It realizes efficient fault detection and section location in overhead lines without voltage transformers, adapts to the access of inverter-type distributed power sources, and has low cost and high adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHONGQING UNIV
- Filing Date
- 2026-04-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing power distribution network protection schemes are difficult to adapt to resonant grounding systems, especially in overhead lines without voltage transformers. They cannot effectively detect phase-to-phase short-circuit faults and high-resistance faults, and their adaptability to the impact of inverter-type distributed power supply access is insufficient, leading to maloperation or failure of protection devices.
A longitudinal protection method based on the amplitude of synthetic transient changes is adopted. By constructing fault characteristic quantities and designing a unified longitudinal location logic, fault analysis is performed using the zero-sequence voltage of the master station and the local current to realize fault segment location and type identification, reduce dependence on voltage transformers, and adapt to different topologies.
It enables unified detection of phase-to-phase short-circuit faults and high-resistance faults in overhead lines without voltage transformers, adapts to inverter-type distributed power supply access, and has a highly adaptable and low-cost protection scheme that balances speed and selectivity.
Smart Images
Figure CN122418554A_ABST