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A method and device for synchronous wave recording

A technology of wave recording device and synchronizing frame, which is applied to measuring device, fault location, and fault detection according to conductor type, etc. lower problem

Active Publication Date: 2022-03-18
上海思源弘瑞自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology records and uploads the detailed information of the power grid operation at the time of the fault through the transient recording type fault indicator. In order to meet ultra-low power consumption and low cost, the transient recording type fault indicator is generally not equipped with an independent clock chip. Instead, an ordinary clock crystal oscillator is used to maintain the local clock. Due to the low precision of the crystal oscillator, random phase shifts of the crystal oscillator will occur over time, which will cause time deviations of each acquisition unit, and make the fault indicator of transient recording type Less accurate synchronization and higher power consumption

Method used

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  • A method and device for synchronous wave recording
  • A method and device for synchronous wave recording
  • A method and device for synchronous wave recording

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Embodiment 1

[0027] figure 1 A flow chart of a synchronous wave recording method provided by an embodiment of the present invention, the method can be executed by a synchronous wave recording device, the synchronous wave recording device includes a three-phase acquisition unit and a collection unit, and the three-phase acquisition unit is connected to a three-phase line One-to-one correspondence, wireless communication connection between the three-phase collection unit and the collection unit.

[0028] Specifically, the synchronous wave recording device can be a transient wave recording type fault indicator composed of a three-phase acquisition unit and a collection unit. The transient state wave recording type fault indicator can record and upload the power grid when the fault occurs by adding a wave recording function. run information. Among them, the three-phase acquisition units are in one-to-one correspondence with the three-phase lines, for example, the A-phase line corresponds to t...

Embodiment 2

[0046] figure 2 For the flow chart of another synchronous wave recording method provided by the embodiment of the present invention, refer to figure 2 , on the basis of the foregoing embodiments, the method specifically includes the following steps:

[0047] Step 210, after the collection unit determines the fault phase of the line according to the fault request message, it sends a fault synchronous time synchronization message to the three-phase acquisition unit in the form of broadcast, wherein the collection unit uses the fault request report sent by the first received three-phase acquisition unit The line corresponding to the text is the fault phase.

[0048] Step 220, each phase acquisition unit records its current sampling times cnt2 and the time difference Δt between the time when each phase acquisition unit receives the collection synchronization frame and the last sampling time when receiving the fault synchronous synchronization message 2 ;

[0049] The acquisit...

Embodiment 3

[0060] image 3 For the flow chart of another synchronous wave recording method provided by the embodiment of the present invention, refer to image 3 , on the basis of the foregoing embodiments, the method specifically includes the following steps:

[0061] Step 310 , before the fault occurs on the line, the three-phase acquisition units buffer the corresponding wave recording data for a preset time; each phase acquisition unit re-buffers the wave recording data after sending the wave recording data, and waits for the next failure wave recording.

[0062] Specifically, according to the national standard, the weekly wave sampling points of the transient wave recording type fault indicator should not be less than 80 points. Therefore, in the embodiment of the present invention, the sampling period of the acquisition unit can be set to 250 microseconds, and 4000 data points are sampled per second. Before the line fault occurs, the three-phase acquisition unit has been bufferin...

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Abstract

The embodiment of the invention discloses a method and device for synchronous wave recording. The synchronous wave recording method includes: after the collection unit determines the fault phase of the line according to the fault request message, it sends the fault synchronous timing message to the three-phase acquisition unit in the form of broadcast, wherein the collection unit sends the first received three-phase acquisition unit The line corresponding to the fault request message is the fault phase; the three-phase acquisition unit sends a fault information message to the collection unit according to the fault synchronous timing message, and the collection unit sends a call recording data message to the three-phase collection unit. The unit records data packets according to the call, based on the time offset Δt 1 Calculate the starting time of the respective wave recording data, and send the wave recording data that has been synchronized with the initial sampling point to the collection unit; the collection unit receives the time difference Δt of each phase acquisition unit 2 , to synchronize the three-phase recording data. The embodiment of the present invention realizes the local synchronization of the acquisition unit first, and the subsequent synchronization of the recorded wave data of each phase in the collection unit.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of fault location, and in particular to a method and device for synchronous wave recording. Background technique [0002] In recent years, the country has invested a lot of money in the transformation of urban and rural power grids for distribution networks, and fault indicators have been widely used as one of the means of fault location in power distribution. [0003] The existing technology records and uploads the detailed information of the power grid operation at the time of the fault through the transient recording type fault indicator. In order to meet ultra-low power consumption and low cost, the transient recording type fault indicator is generally not equipped with an independent clock chip. Instead, an ordinary clock crystal oscillator is used to maintain the local clock. Due to the low precision of the crystal oscillator, random phase shifts of the crystal oscillator will occ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 张瑜君杨杰王吉祥朱佩
Owner 上海思源弘瑞自动化有限公司