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A polarity test method and device for a current transformer in a smart substation

A technology for current transformers and smart substations, applied in the field of substation testing, can solve the problems of difficulty in identifying the polarity of protection windings, low efficiency, low efficiency, etc., so as to reduce the polarity test wiring and testing work of current transformers in smart substations quantity, and the effect of improving efficiency

Active Publication Date: 2016-12-28
WUHAN KEMOV ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the figure that the output of the electronic transformer has a slight DC bias, the polarity of the measured current channel is obvious, and the polarity of the protected current channel is almost submerged in the noise signal. Without signal processing and identification methods, it is difficult Identify the protective winding polarity corresponding to the channel
[0003] At present, traditional electromagnetic current transformers are also used in energy substations, which are transformed into optical digital signal output by the merging unit MU. Traditional electromagnetic current transformers can still use the traditional DC method for polarity testing when they leave the factory, but there are still wiring Complicated, test results cannot be saved and analyzed, low efficiency and other issues
At the smart substation site, the polarity test using the traditional DC method involves changing the wiring of the merging unit and preparing milliampere meters or microammeters with different ranges according to the transformation ratio of the current transformer. The test wiring is complicated and the efficiency is not high.

Method used

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  • A polarity test method and device for a current transformer in a smart substation
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  • A polarity test method and device for a current transformer in a smart substation

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Embodiment 1

[0064] The invention provides a polarity testing method for a current transformer in a smart substation, such as image 3 shown, including steps:

[0065] Step S1, performing circular buffering processing on the secondary side data of the current transformer, and performing low-pass digital filtering calculation on the data;

[0066] Step S2, extract the data in the ΔT time period before the start of the DC method polarity test, calculate the maximum value Imax and the minimum value Imin of the instantaneous value of the filtered data, the maximum value Smax and the minimum value Smin of the half-cycle integral value, as the polarity test background data benchmarks;

[0067] Step S3, after the ΔT time period, use the filtered data instantaneous value i(k), half-cycle integral value s(k) to compare with the background data benchmark to identify the polarity of the current transformer;

[0068] Step S4, if the polarity result is recognized, the polarity result and the correspo...

Embodiment 2

[0088] In order to realize the above-mentioned polarity test method for a current transformer in a smart substation, the present invention also provides a polarity test device for a current transformer in a smart substation, such as Figure 5 As shown, the device includes:

[0089] A signal decoding and acquisition module 1, a data buffering and recording module 2, a human-computer interaction module 3, a low-pass digital filtering module 4, a polarity discrimination module 5, and a polarity result and waveform display module 6 are sequentially connected.

[0090] Signal decoding and acquisition module 1, used to realize the standard analog signal acquisition of the secondary side output of the traditional electromagnetic current transformer, the analog small signal acquisition of the photoelectric current transformer output, and the collector optical digital signal output of the photoelectric current transformer Decoding, decoding of the optical digital SV sampling value sign...

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Abstract

The invention relates to a method and device for polarity testing of a current transformer in a smart substation. The method includes the steps of: performing circular buffer processing on the secondary side data of the current transformer in a smart substation, and extracting the data within the ΔT time period before the polarity test of the DC method starts Data, calculate the filtered data as the background data benchmark of the polarity test; after the ΔT time period, use the filtered data to compare with the background data benchmark to identify the polarity of the current transformer; and store the original data before and after the polarity result, which is convenient After-the-fact analysis. The present invention also proposes a polarity test device for current transformers in intelligent substations that implements the above method, which is suitable for testing the polarity of protection windings and measurement windings of traditional electromagnetic current transformers and photoelectric current transformers, and greatly reduces the polarity of current transformers in intelligent substations. Polarity test wiring and test workload, hand-held portable operation, can significantly improve the efficiency of polarity testing of current transformers in smart substations.

Description

technical field [0001] The invention relates to the technical field of substation testing, in particular to a polarity testing method and device for a current transformer in an intelligent substation. Background technique [0002] The current transformer is an important current conversion equipment in the substation. Its output signal is the only source of current data for protection, measurement and control, metering and other devices, which is of great significance to the safe operation of the substation and even the entire power grid. The current transformer polarity test is an important electrical test in the substation, which can ensure the correct connection of the secondary current loop and the correct winding of the current transformer coil from the source of the data. Traditional electromagnetic current transformers generally use figure 1 The polarity test is carried out by the DC method shown, the battery is connected to the primary side L1, L2 of the current tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06
Inventor 王志华周坤罗建平付燕琴邓星星李岩杨经超
Owner WUHAN KEMOV ELECTRIC