一种高精度输电线路分布式故障定位装置及系统
By integrating a high-precision time-to-digital converter and a dual-channel time difference hardware comparison at transmission line nodes, the problem of insufficient fault location accuracy in existing technologies has been solved, achieving high-precision and stable fault location.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN TELICANG TECH CO LTD
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for locating faults in transmission lines are insufficient to meet high-precision requirements. Impedance location methods are easily affected by line parameters, traveling wave location methods have stringent time synchronization requirements and are limited by existing systems, and distributed diagnostic systems have insufficient location accuracy.
A high-precision time-to-digital converter (TDC) is integrated on each node to directly measure the time difference between the 1PPS signal and the local OCXO clock. The phase difference is obtained through the MCU main control unit, and combined with the dual-channel time difference hardware comparison, a high-precision time reference is achieved. The fault timestamp is transmitted through the CAT1 4G communication unit.
It achieves high-precision fault location with a positioning error of less than 10ns, meeting the needs of refined operation and maintenance, and maintains stable timing in areas with weak BeiDou timing signals, thus improving positioning accuracy and system stability.
Smart Images
Figure CN224518884U_ABST
Abstract
Claims
1. A high-precision power transmission line distributed fault location device, characterized in that, The high-precision distributed fault location device for transmission lines is deployed at each node of the transmission line and includes an MCU main control unit and a time-to-digital converter electrically connected to the MCU main control unit. The time-to-digital converter is used to capture traveling wave signals, 1PPS signals from Beidou satellites, and the local OCXO clock signal of the current high-precision distributed fault location device for transmission lines.
2. The high-precision power transmission line distributed fault location device of claim 1, wherein, The time-to-digital converter is a dual-channel time-to-digital converter, and includes a first time-to-digital converter and a second time-to-digital converter; The 1PPS signal from the BeiDou satellite and the local OCXO clock signal are respectively connected to the start and stop pins of the first time-to-digital converter; the traveling wave signal is connected to the start pin of the second time-to-digital converter, and the 1PPS signal from the BeiDou satellite is also connected to the stop pin of the second time-to-digital converter.
3. The high-precision power transmission line distributed fault location device of claim 2, wherein, The dual-channel time-to-digital converter is connected to the MCU main control unit via an SPI interface.
4. The high-accuracy power line distributed fault location device according to any one of claims 1 to 3, characterized in that, It also includes a CAT1 4G communication unit electrically connected to the MCU main control unit, which is used to communicate with a preset background fault diagnosis center server.
5. The high-precision power transmission line distributed fault location device of claim 4, wherein, It also includes a communication unit power harvesting module and an energy storage module electrically connected to the MCU main control unit; the power harvesting module includes an AC induction power harvesting unit and a solar panel, and is used to harvest electrical energy; the energy storage module includes a lithium battery and a charging and discharging protection circuit corresponding to the lithium battery.
6. The high-precision power transmission line distributed fault location device of claim 4, wherein, It also includes a BeiDou timing module electrically connected to the MCU main control unit, the BeiDou timing module being used to provide 1PPS signals from the BeiDou satellites.
7. The high-accuracy power transmission line distributed fault location device of claim 4, wherein, It also includes a current and voltage acquisition module electrically connected to the MCU main control unit, the current and voltage acquisition module being used to acquire one or more of traveling wave current, hidden current, power frequency current, and power frequency voltage.
8. The high-accuracy power transmission line distributed fault location device of claim 4, wherein, It also includes an encryption module electrically connected to the MCU main control unit, which is used to encrypt the time information and sensor information that need to be uploaded to the preset background fault diagnosis center server.
9. The high-accuracy power transmission line distributed fault location device of claim 4, wherein, It also includes an ambient temperature and humidity acquisition module and / or a wire temperature measurement module electrically connected to the MCU main control unit; the ambient temperature and humidity acquisition module includes a temperature and humidity probe; the wire temperature measurement module includes a wire temperature sensor.
10. A high-precision power transmission line distributed fault location system, characterized in that, It includes a preset background fault diagnosis center server and multiple high-precision distributed fault location devices for transmission lines as described in any one of claims 1 to 9; the high-precision distributed fault location devices for transmission lines are deployed on each node of the transmission line and communicate with the preset background fault diagnosis center server via network.