CN103389483A - System and method for calibrating polarity of current transformer - Google Patents
System and method for calibrating polarity of current transformer Download PDFInfo
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- CN103389483A CN103389483A CN2013103198575A CN201310319857A CN103389483A CN 103389483 A CN103389483 A CN 103389483A CN 2013103198575 A CN2013103198575 A CN 2013103198575A CN 201310319857 A CN201310319857 A CN 201310319857A CN 103389483 A CN103389483 A CN 103389483A
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Abstract
The invention discloses a system and a method for calibrating the polarity of a current transformer, and relates to the technical field of devices and methods of electrical variable measurement. The system comprises a current transformer calibrator, a merging unit and a network analyzer, wherein an output terminal of the current transformer calibrator is connected with an input terminal of the current transformer; and an output terminal of the current transformer is connected with a data input terminal of the network analyzer through the merging unit. The system can accurately judge the polarity of the current transformer, so that a worker is prevented from mistakenly connecting the current transformer, and the safety of construction is improved.
Description
Technical field
The present invention relates to measure the apparatus and method technical field of electric variable.
Background technology
Along with the universal and popularization of intelligent substation, electronic current mutual inductor (ECT) and light formula current transformer (OCT) start to use in a large number.Original current transformer calibrator can only the verification routine current transformer.But the principle of electronic type or light formula current transformer is different from routine transformer, and its secondary output simultaneously is the message take optical fiber as medium, therefore needs a kind of instrument that can carry out electronic type or the verification of light formula current transformer of development.The verification of current transformer is mainly no-load voltage ratio and polarity verification, and the polarity general provision of current transformer is subtractive polarity, and the conventional current mutual inductor can be tested by the method that A-battery carries out point-polarity.Original current transformer calibrator can carry out the no-load voltage ratio test of electronic type or light formula current transformer, but can't 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 be judged the polarity of current transformer accurately, can prevent staff's wrong current transformer, 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 with the data input pin of described network analyzer through described merge cells.
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 kind of method of current transformer polarity check system verification current transformer polarity is characterized in that comprising the following steps:
(1) control the current transformer check meter and export one section continuous wave at T1 in the time period, chien shih current transformer check meter output waveform not while stopping T1, control the current transformer check meter and export one section continuous wave at T2 in the time period, chien shih current transformer check meter output waveform not while stopping T2; Foregoing, as a circulation, is repeated above-mentioned circulation more than two;
(2) use the waveform of observation of use instrument current transformer output terminal, every section waveform of every section waveform of current transformer output terminal and current transformer input end is compared, if the waveform of output terminal is consistent with the waveform of input end, current transformer is subtractive polarity, if the waveform of output terminal is spent with the phase phasic difference 180 of input end waveform, current transformer is additive polarity.
Preferably, use network analyzer to observe the waveform of current transformer output terminal.
The beneficial effect that adopts technique scheme to produce is: the chief component of described system is mutual-inductor tester and network analyzer, wherein network analyzer has the special optic fibre interface, and it can carry out the software setting and specify to receive the data acquisition network exchange of information and with the form of AC wave shape, show.The detection principle of described system is: by the waveform at a plurality of intervals of the input of the input end at current transformer, and use network analyzer to observe the waveform of current transformer output terminal, the multistage waveform is contrasted respectively, draw the polarity of current transformer.Described method, by the multistage comparison of wave shape, can effectively reduce the interference of extraneous factor to output waveform, has improved the accuracy of verification, not there will be the wiring error that causes because of the misjudgment of current transformer polarity, has effectively improved the security of construction.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
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, and 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 with the data input pin of described network analyzer through described merge cells.
A kind of method of current transformer polarity check system verification current transformer polarity comprises the following steps:
(1) control the current transformer check meter and export one section continuous wave at T1 in the time period, chien shih current transformer check meter output waveform not while stopping T1, control the current transformer check meter and export one section continuous wave at T2 in the time period, chien shih current transformer check meter output waveform not while stopping T2; Foregoing, as a circulation, is repeated above-mentioned circulation more than two;
(2) use network analyzer to observe the waveform of current transformer output terminal, every section waveform of every section waveform of current transformer output terminal and current transformer input end is compared, if the waveform of output terminal is consistent with the waveform of input end, current transformer is subtractive polarity, if the waveform of output terminal is spent with the phase phasic difference 180 of input end waveform, current transformer is additive polarity.
This application of principle is exemplified below: the alternating current of at first stipulating this mutual inductor input is power frequency 50Hz, and for initial phase angle, is the sine wave of 0 degree, and its time delay retention time T1 can be long delay 800ms.After after 800ms, instrument stops exporting and keeps 800ms, then export the sine waves that phase angle is 180 degree, retention time T2 is 400ms, after after 400ms, instrument stops exporting and keeps 400ms, take above-mentioned input form as circulation, and continue a plurality of circulations, waveform as shown in Figure 2.Then observe the waveform of output by network analyzer, according to the polarity of waveform to current transformer, judge.
Observe the waveform of network analyzer,, if the waveform that waveform and electronic type or light formula current transformer calibrator are inputted is consistent, as shown in Figure 3, can be judged as electronic type or light formula current transformer polarity is subtractive polarity., if waveform phase differs 180 degree, as shown in Figure 4, differentiate for additive polarity.
The time T 1 of above-mentioned current transformer calibrator input current and T2 and interval time T1 and T2 can adjust, the waveform initial phase angle can be adjusted equally, the ac power waveform by different initial phase angles and different length time delays and identify electronic type interval time or the polarity of light formula current transformer towards.
The chief component of described system is mutual-inductor tester and network analyzer, and wherein network analyzer has the special optic fibre interface, and it can carry out the software setting and specify to receive the data acquisition network exchange of information and with the form of AC wave shape, show.The detection principle of described system is: by the waveform at a plurality of intervals of the input of the input end at current transformer, and use network analyzer to observe the waveform of current transformer output terminal, the multistage waveform is contrasted respectively, draw the polarity of current transformer.Described method is by the multistage comparison of wave shape, the first paragraph waveform of namely inputting 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 variation of output phase, can effectively reduce the interference of extraneous factor to output waveform, improved the accuracy of verification, not there will be the wiring error that causes because of the misjudgment of current transformer polarity, effectively improved the security of construction.
Applied specific case herein principle of the present invention and embodiment thereof are set forth, the explanation of above embodiment is just with helping understand method of the present invention and core concept thereof.Should be pointed out that for the person of ordinary skill of the art, can also carry out some improvement and modification to the present invention under the premise without departing from the principles of the invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (4)
1. 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 with the data input pin of described network analyzer through described merge cells.
2. a kind of current transformer polarity check system according to claim 1, is characterized in that 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.
3. the method for a current transformer polarity check system verification current transformer polarity is characterized in that comprising the following steps:
(1) control the current transformer check meter and export one section continuous wave at T1 in the time period, chien shih current transformer check meter output waveform not while stopping T1, control the current transformer check meter and export one section continuous wave at T2 in the time period, chien shih current transformer check meter output waveform not while stopping T2; Foregoing, as a circulation, is repeated above-mentioned circulation more than two;
(2) use the waveform of observation of use instrument current transformer output terminal, every section waveform of every section waveform of current transformer output terminal and current transformer input end is compared, if the waveform of output terminal is consistent with the waveform of input end, current transformer is subtractive polarity, if the waveform of output terminal is spent with the phase phasic difference 180 of input end waveform, current transformer is additive polarity.
4. the method for a kind of current transformer polarity check system verification current transformer polarity according to claim 3, is characterized in that using network analyzer to observe the waveform of current transformer output terminal.
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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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108287286A (en) * | 2018-01-16 | 2018-07-17 | 济南置真电气有限公司 | A kind of polarity check method based on singlephase earth fault recorder data |
| CN113625644A (en) * | 2021-08-19 | 2021-11-09 | 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 |
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| 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 |
| 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 |
| 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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Patent Citations (4)
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| 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 |
| 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 |
| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108287286A (en) * | 2018-01-16 | 2018-07-17 | 济南置真电气有限公司 | A kind of polarity check method based on singlephase earth fault recorder data |
| 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 |
| CN113625644A (en) * | 2021-08-19 | 2021-11-09 | 国网四川省电力公司电力科学研究院 | Auxiliary system for debugging alternating current system |
| 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 |
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| CN103389483B (en) | 2016-02-17 |
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