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A method, device and system for testing three-phase synchronization accuracy of a distribution line fault indicator

A fault indicator and three-phase synchronization technology, which is applied to measuring devices, instruments, and measuring electrical variables, etc., can solve problems such as the inability to correctly judge the time error of three-phase synchronization, and achieve effective and reliable judgment results and low test costs.

Active Publication Date: 2020-10-16
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sampling rate of the test bench is generally 4000Hz to 5000Hz, and the sampling interval is about 250μs or 200μs, which is far greater than the maximum allowable 100μs of the three-phase synchronization time error, so it is impossible to correctly judge whether the three-phase synchronization time error is within the allowable range

Method used

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  • A method, device and system for testing three-phase synchronization accuracy of a distribution line fault indicator
  • A method, device and system for testing three-phase synchronization accuracy of a distribution line fault indicator
  • A method, device and system for testing three-phase synchronization accuracy of a distribution line fault indicator

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Embodiment 1

[0054] refer to image 3 As shown, a method for testing the three-phase synchronization accuracy of a distribution line fault indicator in this embodiment includes:

[0055] Obtain three sets of wave recording data corresponding to the sampling time, collected by the three-phase acquisition unit of the fault indicator in response to the test current waveform on the same line;

[0056] Taking any acquisition unit as a reference acquisition unit, and other acquisition units as comparison acquisition units, based on the set data window width, selecting continuously sampled wave recording data from the wave recording data corresponding to the reference acquisition unit, to obtain a reference wave recording data sequence;

[0057] Based on the previously set data window width, using the sliding window, within the set sliding range, each slide selects the continuously sampled wave recording data from the wave recording data corresponding to the control acquisition unit to obtain mul...

Embodiment 2

[0071] Based on the test method of embodiment 1, such as figure 1 As shown, the three-phase acquisition unit of the fault indicator to be tested is connected to the same phase line of the test bench, and then the test current waveform is passed to the primary side of the test bench.

[0072] The three-phase acquisition unit of the fault indicator responds to the test current waveform respectively, and the collected current waveform can be obtained from the collection unit of the fault indicator. Refer to figure 2 , the acquisition waveforms of the three acquisition units inevitably have time synchronization errors due to various practical factors.

[0073] The three-phase acquisition unit of the fault indicator is defined as acquisition unit 1 / 2 / 3. In this embodiment, after acquiring the wave recording data of the three-phase acquisition unit, the acquisition unit 1-bit reference acquisition unit is selected, that is, the reference phase, and a fixed window is used to start f...

Embodiment 3

[0083] Based on the same inventive concept as Embodiments 1 and 2, this embodiment is a three-phase synchronization accuracy test device for a distribution line fault indicator, including: a wave recording data acquisition module, used to obtain the response of the three-phase acquisition unit of the fault indicator The three sets of wave recording data corresponding to the sampling time are collected from the test current waveform on the same line;

[0084] The reference wave recording data sequence selection module is used to select continuously sampled wave recording data from the wave recording data corresponding to the preset reference acquisition unit based on the set data window width to obtain the reference wave recording data sequence;

[0085] The relevant wave recording data sequence selection module is used to use the sliding window based on the previously set data window width, within the set sliding range, each time sliding from the wave recording data correspondi...

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Abstract

The invention discloses a method, a device, and a system for testing the accuracy of a synchronous three-phase of a fault indicator of a distribution circuit. During the test, a fault indicator three-phase acquisition unit is mounted on the same phase circuit of the test bench; a test current waveform is inputted on the primary side of the test bench; and then recorded wave data of the fault indicator three-phase acquisition unit is obtained; the purpose of comparing the time delay between the three groups of the recorded wave data is achieved by utilizing the correlation coefficient algorithm; time error of the synchronous three-phase of the fault indicator is calculated, and whether the time error of the synchronous three-phase in the allowable range of precision can be determined. According to the method, the device, and the system for the testing accuracy of the synchronous three-phase of the fault indicator of the distribution circuit, whether the time error of the synchronizationof the three-phase acquisition unit is in the allowable range can be judged without changing the sampling rate of the test bench; the result of judgment is effective and reliable, and the cost of thetest is low.

Description

technical field [0001] The invention relates to the technical field of distribution automation equipment, in particular to a method, device and system for testing three-phase synchronization accuracy of a distribution line fault indicator. Background technique [0002] The distribution line fault indicator is installed on the distribution line to detect the short-circuit fault and single-phase ground fault of the distribution line and send out an alarm message. It is a simple and practical "two-remote" distribution automation solution. Program. The distribution line fault indicator is composed of a three-phase acquisition unit and a collection unit. The collection unit and the collection unit use short-distance wireless communication. The collection unit and the remote data center generally use GPRS public network communication for data transmission. [0003] The three-phase acquisition unit of the distribution line fault indicator is mounted on the three-phase line respect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 曾飞袁栋黄哲忱袁宇波周建华孙健高磊卜强生杨雄彭志强李虎成吴楠方鑫张刘冬陈实李娟
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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