Submicrosecond punctuality method suitable for overhead line fault monitoring terminal

By receiving and smoothly processing satellite signals, dynamically adjusting the temperature-compensated crystal oscillator frequency and switching the working mode, combined with incremental PID control, the high power consumption and anti-jitter problems of overhead line fault monitoring terminals are solved, and time synchronization and fault positioning accuracy are achieved in sub-microseconds.

CN120491420APending Publication Date: 2025-08-15JIANGSU HANLIN ZHENGCHUAN ENG TECH CO LTD
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Patent Information

Application Number
CN202510708018.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-29
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

The punctual solution of the existing FPGA or CPLD+Beidou/GPS modules has problems such as excessive power consumption, poor environmental adaptability and insufficient anti-jitter capability in overhead line fault monitoring terminals, resulting in large time synchronization errors and affecting the fault positioning accuracy.

Method used

The 1PPS signal output from the satellite is received and smoothly processed, the average count value is calculated through the sliding window, the temperature and supplementary crystal oscillator frequency is dynamically adjusted, and the working mode is automatically switched according to the signal quality, combined with the incremental PID control algorithm and low-power MCU counter, the sub-microsecond level punctuality is realized.

Benefits of technology

It realizes low-cost, low-power consumption and high-precision time synchronization, and is suitable for distributed fault ranging terminals of overhead lines, reducing time synchronization errors and improving fault positioning accuracy.

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Abstract

The invention discloses a sub-microsecond timekeeping method suitable for an overhead line fault monitoring terminal, and belongs to the technical field of power system power transmission line fault monitoring, and the timekeeping method comprises the following specific steps: I, receiving and smoothing a 1PPS signal output by a satellite, and updating an average count value in real time; iI, comparing the count value per second output by the temperature compensation crystal oscillator with the average count value in real time, and dynamically adjusting the output frequency of the temperature compensation crystal oscillator according to a comparison result; iII, automatically switching a working mode in real time according to the quality of the 1PPS signal output by the satellite; according to the invention, low cost, low power consumption and submicrosecond-level high-precision time keeping are realized, and the method is suitable for applications with limited energy taking, such as an overhead line distributed fault distance measurement terminal and the like.
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