Accurate synchronization method of transient recording type fault indicator

Abstract

The invention discloses an accurate synchronization method of a transient recording type fault indicator, which comprises the following steps of: receiving time synchronization of a fault indicator collection unit through a fault indicator acquisition unit, calculating the rhythm of a local clock and a time synchronization clock in a time synchronization period, comparing, carrying out lead or lag compensation, and if the rhythm numbers are consistent, carrying out time synchronization. If yes, the beat matching error is reduced to the minimum. And if the condition that the beat number of the local clock and the beat number of the time synchronization clock in the time synchronization period are inconsistent occurs again, the crystal oscillator offset error is calculated and compensated, and the synchronization error is reduced to be within one clock period by calibrating the beat matching error and the crystal oscillator offset error. The method is simple and reliable, occupies few resources, is high in adaptive capacity, realizes accurate synchronization of the transient wave recording type fault indicator, increases the fault waveform research and judgment accuracy, improves the power supply stability of a power grid, and is of great significance in maintaining a reliable power utilization environment.

Description

technical field [0001] The invention relates to a medium-voltage distribution network technology, in particular to a precise synchronization method of a transient recording type fault indicator. Background technique [0002] The transient recording type fault indicator is a typical one-master multi-slave embedded device that requires low power consumption and high precision. The indicator collection unit has three fault indicator collection units. The fault indicator acquisition unit collects the current and electric field of the line. When the line is abnormal, the fault indicator acquisition unit triggers the recording and transmits the real-time collected data to the fault indicator collection unit, which then uploads the waveform to the fault indicator collection unit through 4G. Main station research. The fault indicator collection unit calibrates the fault indicator acquisition unit, so that each fault indicator acquisition unit realizes the synchronization of the sa...

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Problems solved by technology

[0003] The clocks of such embedded devices use different crystal oscillators to have different accuracy, but for crystal oscillators, they will all drift with time or temperature, which will amplify the error clock error for devices that require precise synchronization is not allowed, so clock synchronization is required to reduce this error

[0004] According to the regulations, the accuracy of the fault indicator of transient recording type should be within 100us. At present, the common method of clock synchronization is to shorten the synchronous time calibration cycle, and the time is corrected every second or tens of milliseconds, which greatly increases the power consumption of wireless transmission. , and some even find another way to use GPS to adjust the time, which cannot meet the precise synchronization under ultra-low power consumption

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