A three-phase sag and phase current joint reconstruction method and system, device and medium for overhead power transmission lines
By combining magnetic field sensors and Kalman filtering algorithms with catenary and thermal circuit models, synchronous reconstruction of current and sag in overhead transmission lines was achieved, solving the problems of measurement complexity and synchronization in existing technologies and improving the operating efficiency and safety of the lines.
Patent Information
- Application Number
- CN202610531163.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-21
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, current measurement and sag measurement of overhead transmission lines have problems such as complex insulation, inconvenient installation, reliability affected by the environment, complex calculation, expensive equipment, and sensitivity to noise. Moreover, it is impossible to achieve efficient and reliable measurement of current and sag simultaneously.
A magnetic field sensor is used to obtain the horizontal component of the magnetic field. A catenary model is constructed and a magnetic field model is established based on the Biot-Savart law. The nonlinear relationship between the magnetic field coefficient and sag is fitted using a quadratic polynomial. The extended Kalman filter algorithm is used for reconstruction, and the dynamic current carrying capacity threshold is calculated by combining the conductor thermal circuit model, so as to realize the synchronous reconstruction of current and sag.
It enables contactless installation, reducing deployment difficulty and cost, and simultaneously acquires current and sag data, outputting smooth, stable, and reliable time-series data to meet the high standards of online monitoring and intelligent decision-making, thereby improving line transmission capacity and safety.
Smart Images
Figure CN122410167A_ABST