CN103389483B - A kind of method of the verification current transformer polarity based on current transformer polarity check system - Google Patents
A kind of method of the verification current transformer polarity based on current transformer polarity check system Download PDFInfo
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Abstract
The invention discloses a kind of current transformer polarity check system and polarity check method, relate to the apparatus and method technical field measuring electric variable.Described system comprises current transformer calibrator, merge cells and network analyzer, the output terminal of described current transformer calibrator is connected with the input end of current transformer, and the output terminal of described current transformer is connected through the data input pin of described merge cells with described network analyzer.Described system can judge the polarity of current transformer accurately, can prevent staff's wrong current transformer, improve the security of construction.
Description
Technical field
The present invention relates to the apparatus and method technical field measuring electric variable.
Background technology
Along with the universal of intelligent substation and popularization, electronic current mutual inductor (ECT) and light formula current transformer (OCT) start to use in a large number.Original current transformer calibrator can only verify conventional current transformer.But the principle of electronic type or light formula current transformer is different from routine transformer, simultaneously its secondary exports is take optical fiber as the message of medium, therefore needs to develop a kind of instrument that can carry out electronic type or the verification of light formula current transformer.The verification of current transformer is no-load voltage ratio and polarity verification mainly, and the polarity general provision of current transformer is subtractive polarity, and the method that conventional current mutual inductor can carry out point-polarity by A-battery is tested.Original current transformer calibrator can carry out the no-load voltage ratio test of electronic type or light formula current transformer, but cannot complete the polarity test of electronic type and light mutual inductor.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of current transformer polarity check system and polarity check method, described system can judge the polarity of current transformer accurately, staff's wrong current transformer can be prevented, improve the security of construction.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of current transformer polarity check system, it is characterized in that comprising current transformer calibrator, merge cells and network analyzer, the output terminal of described current transformer calibrator is connected with the input end of current transformer, and the output terminal of described current transformer is connected through the data input pin of described merge cells with described network analyzer.
Preferably, described current transformer is electronic type or light formula current transformer, and described current transformer calibrator is electronic type or light formula current transformer calibrator.
A method for current transformer polarity check system verification current transformer polarity, is characterized in that comprising the following steps:
(1) control current transformer check meter and export one section of continuous wave within the T1 time period, chien shih current transformer check meter not output waveform during stopping T1, control current transformer check meter and export one section of continuous wave within the T2 time period, chien shih current transformer check meter not output waveform during stopping T2; Using foregoing as a circulation, repeat the above-mentioned circulation of two or more;
(2) waveform of observation of use instrument current transformer output terminal is used, every section of waveform of current transformer output terminal and every section of waveform of current transformer input end are compared, if the waveform of output terminal is consistent with the waveform of input end, then current transformer is subtractive polarity, if the phase of the waveform of output terminal and input end waveform 180 degree, then current transformer is additive polarity.
Preferably, network analyzer is used to observe the waveform of current transformer output terminal.
The beneficial effect adopting technique scheme to produce is: the chief component of described system is mutual-inductor tester and network analyzer, wherein network analyzer has special optic fibre interface, and it can carry out software design patterns and specify receiving data acquisition network exchange of information and showing with the form of AC wave shape.The Cleaning Principle of described system is: by inputting the waveform at multiple interval at the input end of current transformer, and uses network analyzer to observe the waveform of current transformer output terminal, is contrasted respectively by multistage waveform, draws the polarity of current transformer.Described method, by multistage comparison of wave shape, can effectively reduce the interference of extraneous factor to output waveform, improve the accuracy of verification, there will not be the wiring error caused because of the misjudgment of current transformer polarity, effectively improve the security of construction.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the theory diagram of described system;
Fig. 2 is the waveform schematic diagram of current transformer input end;
Fig. 3 is the waveform schematic diagram of subtractive polarity current transformer output terminal;
Fig. 4 is the waveform schematic diagram of additive polarity current transformer output terminal.
Embodiment
As shown in Figure 1, a kind of current transformer polarity check system, comprise electronic type or light formula current transformer calibrator, merge cells and network analyzer, the output terminal of described current transformer calibrator is connected with the input end of current transformer.In the present embodiment, current transformer is electronic type or light formula current transformer, and the output terminal of described current transformer is connected through the data input pin of described merge cells with described network analyzer.
A method for current transformer polarity check system verification current transformer polarity, comprises the following steps:
(1) control current transformer check meter and export one section of continuous wave within the T1 time period, chien shih current transformer check meter not output waveform during stopping T1, control current transformer check meter and export one section of continuous wave within the T2 time period, chien shih current transformer check meter not output waveform during stopping T2; Using foregoing as a circulation, repeat the above-mentioned circulation of two or more;
(2) network analyzer is used to observe the waveform of current transformer output terminal, every section of waveform of current transformer output terminal and every section of waveform of current transformer input end are compared, if the waveform of output terminal is consistent with the waveform of input end, then current transformer is subtractive polarity, if the phase of the waveform of output terminal and input end waveform 180 degree, then current transformer is additive polarity.
This principle applicating example is as follows: first specify that the alternating current that this mutual inductor inputs is power frequency 50Hz, and for initial phase angle be the sine wave of 0 degree, its time delay retention time T1 can be long delay 800ms.After 800ms, instrument stops exporting and after keeping 800ms, then exports the sine wave that phase angle is 180 degree, and retention time T2 is 400ms, after 400ms, instrument stops exporting and after keeping 400ms, with above-mentioned input form for circulation, and continue multiple circulation, waveform as shown in Figure 2.Then observed the waveform exported by network analyzer, judge according to the polarity of waveform to current transformer.
Observe the waveform of network analyzer, if waveform is consistent with the waveform that electronic type or light formula current transformer calibrator input, as shown in Figure 3, then can be judged as that electronic type or light formula current transformer polarity are subtractive polarity.If waveform phase difference 180 degree, as shown in Figure 4, is then determined as additive polarity.
Time T1 and T2 of above-mentioned current transformer calibrator input current and interval time T1 and T2 can adjust, waveform initial phase angle can adjust equally, by ac power waveform and the different length time delays of different initial phase angle and identify interval time the polarity of electronic type or light formula current transformer towards.
The chief component of described system is mutual-inductor tester and network analyzer, and wherein network analyzer has special optic fibre interface, and it can carry out software design patterns and specify receiving data acquisition network exchange of information and showing with the form of AC wave shape.The Cleaning Principle of described system is: by inputting the waveform at multiple interval at the input end of current transformer, and uses network analyzer to observe the waveform of current transformer output terminal, is contrasted respectively by multistage waveform, draws the polarity of current transformer.Described method is by multistage comparison of wave shape, namely the first paragraph waveform inputted and the first paragraph comparison of wave shape of output, the second segment waveform of input and the second segment comparison of wave shape of output, by that analogy, observe the change exporting phase place, the interference of extraneous factor to output waveform can be effectively reduced, improve the accuracy of verification, there will not be the wiring error caused because of the misjudgment of current transformer polarity, effectively improve the security of construction.
Apply specific case herein to set forth principle of the present invention and embodiment thereof, the explanation of above embodiment is only used to help to understand method of the present invention and core concept thereof.It should be pointed out that for the person of ordinary skill of the art, can also carry out some improvement and modification under the premise without departing from the principles of the invention to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (1)
1. the method based on the verification current transformer polarity of current transformer polarity check system, described current transformer polarity check system comprises current transformer calibrator, merge cells and network analyzer, the output terminal of described current transformer calibrator is connected with the input end of current transformer, the output terminal of described current transformer is connected through the data input pin of described merge cells with described network analyzer, it is characterized in that: said method comprising the steps of:
(1) control current transformer calibrator and export one section of continuous wave within the T1 time period, chien shih current transformer calibrator not output waveform during stopping T1, control current transformer calibrator and export one section of continuous wave within the T2 time period, chien shih current transformer calibrator not output waveform during stopping T2; Using foregoing as a circulation, repeat the above-mentioned circulation of two or more;
(2) network analyzer is used to observe the waveform of current transformer output terminal, every section of waveform of current transformer output terminal and every section of waveform of current transformer input end are compared, if the waveform of output terminal is consistent with the waveform of input end, then current transformer is subtractive polarity, if the phase of the waveform of output terminal and input end waveform 180 degree, then current transformer is additive polarity.
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| CN201310319857.5A CN103389483B (en) | 2013-07-26 | 2013-07-26 | A kind of method of the verification current transformer polarity based on current transformer polarity check system |
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| CN201310319857.5A CN103389483B (en) | 2013-07-26 | 2013-07-26 | A kind of method of the verification current transformer polarity based on current transformer polarity check system |
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| CN103389483B true CN103389483B (en) | 2016-02-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106990378A (en) * | 2017-05-15 | 2017-07-28 | 国家电网公司 | A kind of alternating current filter group current transformer device for detecting polarity and method |
| CN108287286B (en) * | 2018-01-16 | 2023-03-14 | 济南置真电气有限公司 | Polarity verification method based on single-phase earth fault recording data |
| CN113625644B (en) * | 2021-08-19 | 2022-04-15 | 国网四川省电力公司电力科学研究院 | Auxiliary system for debugging alternating current system |
| CN114137469A (en) * | 2021-11-25 | 2022-03-04 | 国网陕西省电力公司西咸新区供电公司 | Method and system for realizing intelligent calibration of multi-tap current transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545961A (en) * | 2009-04-21 | 2009-09-30 | 江苏省电力试验研究院有限公司 | System and method for polarity testing of electronic transformer |
| CN102393497A (en) * | 2011-09-09 | 2012-03-28 | 陕西电力科学研究院 | Portable polarity calibrator for electronic mutual inductor |
| CN102435907A (en) * | 2011-10-31 | 2012-05-02 | 许继集团有限公司 | Polarity test method for electronic current transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201540345U (en) * | 2009-12-07 | 2010-08-04 | 苏州市华电电气技术有限公司 | Mutual inductor polarity wired tester |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545961A (en) * | 2009-04-21 | 2009-09-30 | 江苏省电力试验研究院有限公司 | System and method for polarity testing of electronic transformer |
| CN102393497A (en) * | 2011-09-09 | 2012-03-28 | 陕西电力科学研究院 | Portable polarity calibrator for electronic mutual inductor |
| CN102435907A (en) * | 2011-10-31 | 2012-05-02 | 许继集团有限公司 | Polarity test method for electronic current transformer |
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