CN103278790A - Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof - Google Patents
Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof Download PDFInfo
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- CN103278790A CN103278790A CN2013101166211A CN201310116621A CN103278790A CN 103278790 A CN103278790 A CN 103278790A CN 2013101166211 A CN2013101166211 A CN 2013101166211A CN 201310116621 A CN201310116621 A CN 201310116621A CN 103278790 A CN103278790 A CN 103278790A
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000002955 isolation Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 230000005622 photoelectricity Effects 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
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- 230000005693 optoelectronics Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000518 rheometry Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The invention relates to a fast testing instrument of the variable ratio and the polarity of a current transformer and a testing method thereof. According to the invention, not only can the time for testing the variable ratio and the polarity of the current transformer be shortened from about 50min to about 25min, but also the invention has the advantages of small size, convenience in carrying, high in measuring accuracy, safety and reliability. The testing method comprises the following steps: the voltage outputted by a volt-ampere tester is inputted to a volt-ampere voltage input end of the tester, an exciting voltage U2 is outputted to a secondary coil of the current transformer by S1 and S2; a primary side of the current transformer is inputted to the input end of a primary voltage U1 of the testing instrument; volt and ampere are inputted to the output end of the exciting voltage U2, and then a small current transformer is connected in series and is used for monitoring volt-ampere current I; U2, I and U1 are respectively sampled by a corresponding range switching circuit, a corresponding buffering and amplifying circuit and an corresponding AD, and are transmitted to a CPU (Central Processing Unit) by optoelectronic isolation; the CPU measures amplitudes of three paths of signals; and the U2 and the U1 are also changed into square waves through a waveform converting circuit, the square waves are transmitted to the CPU through the opoelectronic isolation to be used for measuring the phase difference of the U2 and the U1, so as to judge the polarity of the current transformer.
Description
Technical field
The present invention relates to a kind of time that can make current transformer ratio, polarity test shortens to about 25min about by 50min, have again volume little, be easy to carry, a kind of current transformer ratio polarity high speed tester and the method for testing of measuring accuracy height, safe and reliable advantage, belong to forceful electric power piezoelectricity current test instrument and make the field.
Background technology
CN102780234A, title " generation engineering high-voltage electrical apparatus adjustment method ", this adjustment method comprises the debugging preparation, high-tension apparatus envelope test and debugging, generator envelope test and debugging, the PT nuclear phase, starting characteristics test, dynamically and directionally and electricity generation grid-connecting, it is characterized in that: the wiring of voltage transformer (VT), polarity check and no-load voltage ratio are measured the wiring that the voltage measuring transformer winding is done in test, when polarity check and no-load voltage ratio are measured test, before measurement mutual inductor one, the insurance of secondary side disconnects, the slotted line correspondence of full-automatic no-load voltage ratio tester received in the primary side of voltage transformer (VT) and the secondary side measure on the winding leading-out terminal, begin then to measure; When the result who measures for the three-phase no-load voltage ratio is 100, the mode of connection is Y, during y0, no-load voltage ratio, polarity and wiring are all correct; Doing wiring, polarity check and the no-load voltage ratio of voltage transformer (VT) protection winding measures when testing, should be the opening short circuit, form delta connection, then the slotted line correspondence of full-automatic no-load voltage ratio tester is received on three da terminals of protection winding in the primary side of voltage transformer (VT) and the secondary side, when the result who measures for the three-phase no-load voltage ratio is 300, the mode of connection is Y, during d, no-load voltage ratio, polarity and wiring are all correct;Its weak point: the one, testing equipment heaviness, complex procedures; The 2nd, to arrive kiloampere sometimes when strengthening electric current, if wiring is not firm, can cause serious arcing, injure equipment and the person; The 3rd, the moment that adds DC voltage during test can produce at the wiring busbar of rheology burns.
Summary of the invention
Purpose of design: avoid the weak point in the background technology, designing a kind of time that can make current transformer ratio, polarity test shortens to about 25min about by 50min, have again volume little, be easy to carry, a kind of current transformer ratio polarity high speed tester and method of testing that measuring accuracy height, peace close reliable advantage.
Design proposal: in order to realize above-mentioned purpose of design of the present invention.1, no-load voltage ratio is measured: when doing the secondary winding in current transformer volt-ampere characteristic test, added field voltage U2 in Secondary Winding, if this moment, a winding induced voltage U1 with mutual inductor carried out synchro measure, U2/U1 can calculate the no-load voltage ratio of current transformer so, and voltage method is surveyed current transformer ratio.2. polarity measurement: when the voltage method no-load voltage ratio is measured, measure the phase differential of U2 and U1, just can judge the polarity of current transformer: if U1 and U2 homophase (phase differential is near 0 °) then are subtractive polarity; If U1 and U2 anti-phase (phase differential is near 180 °) then are additive polarity.3, determining of voltage measurement range: U1, U2 measurement are required to be root-mean-square value, and the measurement range of U2 voltage needs to determine according to the volt-ampere characteristic of different current transformers, to the metering winding; saturation voltage is lower; to jumbo protection winding, saturation voltage is higher, determines that first range of U2 is
1000V, consider and take into account the metering winding, determine that U2 second range is 100 V, all can measure the voltage of Secondary Winding voltage from 10V to 100V like this; To the measurement range of U1, minimum can measure 0.05V, determines that the U1 maximum is measured as
5V, determine that range is 5V and 0.5V and is automatic range.4, survey the current transformer principle analysis according to voltage method, exciting current is more little, and systematic error is more little, at different CT saturation voltage differences, exciting current is introduced tester, measures no-load voltage ratio when saturated approaching, and improves measurement U1 and U2 with a nearly step.
Technical scheme 1: a kind of current transformer ratio polarity high speed tester, comprise the current transformer ratio tester, described current transformer ratio tester signal output terminal one tunnel connects the signal input part that signal input part, a tunnel that field voltage monitor signal input end, a tunnel connects the no-load voltage ratio display connects the primary voltage display.
Technical scheme 2: a kind of method of testing of current transformer ratio polarity high speed tester is characterized in that: import the volt-ampere voltage input end of this tester by the voltage of volt-ampere test instrument output, by S
1, S
2Output field voltage U
2To the secondary coil of current transformer, the primary side of current transformer inputs to the primary voltage U of this tester
1Input end, volt-ampere inputs to field voltage U
2Output terminal is connected in series a small current mutual inductor, is used for monitoring voltammetric current I; U
2, I and U
1Through corresponding range switch circuit, buffer amplifier circuit and AD sampling, deliver to CPU through the photoelectricity isolation respectively, CPU measures the amplitude of 3 road signals, U
2And U
1Also become square wave through the waveform transformation circuit respectively, after photoelectricity is isolated, deliver to CPU, be used for measuring U
2And U
1Phase differential, thereby judge the polarity of current transformer.
The present invention compares with background technology, and the one, adopt the alternating current platen press to measure no-load voltage ratio and the polarity of rheology, not only measurement is more accurate, be convenient to control and protection, and voltage can be regulated continuously; The 2nd, owing to adopted current transformer ratio, polarity high speed tester to carry out rheological test, thus saved the time, namely (50-20) min/ group * 24(organizes)=720min, work efficiency has improved 60%; The 3rd, owing to adopted voltage method, than current method safety and reliability, eliminated security hidden danger, guaranteed operative employee's personal safety.
Description of drawings
Fig. 1 is the main TV structure synoptic diagram of current transformer ratio polarity high speed tester.
Fig. 2 is Fig. 1 circuit theory synoptic diagram.
Fig. 3 is the connection diagram of tested current transformer.
Fig. 4 is the local structure for amplifying synoptic diagram of Fig. 1.
Embodiment
Embodiment 1: with reference to accompanying drawing 1-4.A kind of current transformer ratio polarity high speed tester comprises the current transformer ratio tester, and this current transformer ratio tester is prior art, is not described herein at this.Described current transformer ratio tester signal output terminal one tunnel connects the signal input part that signal input part, a tunnel that field voltage monitor signal input end, a tunnel connects the no-load voltage ratio display connects the primary voltage display.
Among Fig. 1: 1. field voltage U
2Display window; 2. volt-ampere voltage input end; 3. no-load voltage ratio display window; 4. field voltage U
2Lead-out terminal; 5. the secondary rated current is selected current transformer; 6. primary voltage U
1Input terminal; 7. primary voltage U
1Display window; 8. ground terminal; 9. power input socket; 10. power supply is opened; 11. polarity pilot lamp; 12. continuously/single selection current transformer; 13. reset button.
Adopt the digital no-load voltage ratio that shows, owing to the Current Transformer Secondary rated current has 1A and 5A, the no-load voltage ratio value is shown according to the actual current mutual inductor ratio, secondary current also shows with charactron, needs to increase a secondary rated current selector switch.The polarity diode displaying is seen Fig. 4.
Embodiment 2: on the basis of embodiment 1, a kind of method of testing of current transformer ratio polarity high speed tester is imported the volt-ampere voltage input end of this tester by the voltage of volt-ampere test instrument output, by S
1, S
2Output field voltage U
2To the secondary coil of current transformer, the primary side of current transformer inputs to the primary voltage U of this tester
1Input end, volt-ampere inputs to field voltage U
2Output terminal is connected in series a small current mutual inductor, is used for monitoring voltammetric current I; U
2, I and U
1Through corresponding range switch circuit, buffer amplifier circuit and AD sampling, deliver to CPU through the photoelectricity isolation respectively, CPU measures the amplitude of 3 road signals, U
2And U
1Also become square wave through the waveform transformation circuit respectively, after photoelectricity is isolated, deliver to CPU, be used for measuring U
2And U
1Phase differential, thereby judge the polarity of current transformer.U1, U2 measurement are required to be root-mean-square value, and the measurement range of U2 voltage needs to determine according to the volt-ampere characteristic of different current transformers that to the metering winding, saturation voltage is lower, and to jumbo protection winding, saturation voltage is higher, and first range of U2 is
1000V, U2 second range is 100 V; The U1 range is 5V and 0.5V and is automatic range.The raising of the measuring accuracy of U1 and U2 then at the saturation voltage of different CT, utilizes exciting current to introduce tester and is approaching measurement no-load voltage ratio when saturated.If U1 and U2 homophase, phase differential near 0 °, then are subtractive polarity; If U1 and U2 are anti-phase, phase differential then is additive polarity near 180 °.
What need understand is: though above-described embodiment is to the mentality of designing of the present invention detailed text description of contrasting; but these text descriptions; just the simple text of mentality of designing of the present invention is described; rather than to the restriction of mentality of designing of the present invention; any combination, increase or modification that does not exceed mentality of designing of the present invention all falls within the scope of protection of the present invention.
Claims (5)
1. current transformer ratio polarity high speed tester, comprise the current transformer ratio tester, it is characterized in that: described current transformer ratio tester signal output terminal one tunnel connects the signal input part that signal input part, a tunnel that field voltage monitor signal input end, a tunnel connects the no-load voltage ratio display connects the primary voltage display.
2. the method for testing of a current transformer ratio polarity high speed tester is characterized in that: import the volt-ampere voltage input end of this tester by the voltage of volt-ampere test instrument output, by S
1, S
2Output field voltage U
2To the secondary coil of current transformer, the primary side of current transformer inputs to the primary voltage U of this tester
1Input end, volt-ampere inputs to field voltage U
2Output terminal is connected in series a small current mutual inductor, is used for monitoring voltammetric current I; U
2, I and U
1Through corresponding range switch circuit, buffer amplifier circuit and AD sampling, deliver to CPU through the photoelectricity isolation respectively, CPU measures the amplitude of 3 road signals, U
2And U
1Also become square wave through the waveform transformation circuit respectively, after photoelectricity is isolated, deliver to CPU, be used for measuring U
2And U
1Phase differential, thereby judge the polarity of current transformer.
3. the method for testing of current transformer ratio polarity high speed tester according to claim 2; it is characterized in that: U1, U2 measurement are required to be root-mean-square value; the measurement range of U2 voltage needs to determine according to the volt-ampere characteristic of different current transformers; to the metering winding; saturation voltage is lower; to jumbo protection winding, saturation voltage is higher, and first range of U2 is
1000V, U2 second range is 100 V; The U1 range is 5V and 0.5V and is automatic range.
4. the method for testing of current transformer ratio polarity high speed tester according to claim 2, it is characterized in that: the raising of the measuring accuracy of U1 and U2, then at the saturation voltage of different CT, utilize exciting current to introduce tester and approaching measurement no-load voltage ratio when saturated.
5. the method for testing of current transformer ratio polarity high speed tester according to claim 2, it is characterized in that: if U1 and U2 homophase, phase differential then is subtractive polarity near 0 °; If U1 and U2 are anti-phase, phase differential then is additive polarity near 180 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310116621.1A CN103278790B (en) | 2012-11-29 | 2013-04-03 | A kind of current transformer ratio polarity high speed tester and method of testing |
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|---|---|---|---|
| CN201220643539 | 2012-11-29 | ||
| CN2012206435395 | 2012-11-29 | ||
| CN201220643539.5 | 2012-11-29 | ||
| CN201310116621.1A CN103278790B (en) | 2012-11-29 | 2013-04-03 | A kind of current transformer ratio polarity high speed tester and method of testing |
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| Publication Number | Publication Date |
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| CN103278790A true CN103278790A (en) | 2013-09-04 |
| CN103278790B CN103278790B (en) | 2016-12-28 |
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|---|---|---|---|
| CN201310116621.1A Expired - Fee Related CN103278790B (en) | 2012-11-29 | 2013-04-03 | A kind of current transformer ratio polarity high speed tester and method of testing |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940391A (en) * | 2017-04-06 | 2017-07-11 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN107167758A (en) * | 2017-07-11 | 2017-09-15 | 国网辽宁省电力有限公司沈阳供电公司 | Mutual inductor ratio, polarity tester with waveform display function |
| CN107271830A (en) * | 2017-05-25 | 2017-10-20 | 保定丰源电子科技有限公司 | A kind of no-load voltage ratio quick calculation method under special transformer non-equilibrium state |
| CN107728092A (en) * | 2017-10-02 | 2018-02-23 | 国网山西省电力公司电力科学研究院 | The automatic precision pre-check device and method of calibration of Transformer Winding no-load voltage ratio tester |
| CN108646133A (en) * | 2016-01-18 | 2018-10-12 | 辛兴华 | A kind of production method of current transformer Check up polarity termination |
| CN108732459A (en) * | 2018-03-23 | 2018-11-02 | 国网上海市电力公司 | A kind of current transformer polarity testing method |
| CN109075557A (en) * | 2016-03-24 | 2018-12-21 | 力特有限公司 | More current sensor systems |
| CN111077477A (en) * | 2019-10-27 | 2020-04-28 | 徐州和纬信电科技有限公司 | Line selection device and zero sequence current polarity detection and automatic correction method thereof |
| CN111257798A (en) * | 2020-01-16 | 2020-06-09 | 江苏广识电气有限公司 | Method for detecting polarity of zero-sequence current of line selection and automatically correcting |
| CN111398644A (en) * | 2020-03-31 | 2020-07-10 | 贵州电网有限责任公司 | Mutual inductor handover test switching device and switching method thereof |
| CN112327016A (en) * | 2020-11-05 | 2021-02-05 | 国网湖北省电力有限公司宜昌供电公司 | Current transformer test wire box |
| CN113138336A (en) * | 2021-04-16 | 2021-07-20 | 西安热工研究院有限公司 | Test method for measuring voltage and power direction of generator by short route test in high plant |
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| CN102621407A (en) * | 2012-04-27 | 2012-08-01 | 江苏省电力公司宿迁供电公司 | Method for measuring transformation ratio of transformer in power failure state |
| CN102780234A (en) * | 2012-08-08 | 2012-11-14 | 中国二十二冶集团有限公司 | High-voltage electric debugging method for power generation project |
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2013
- 2013-04-03 CN CN201310116621.1A patent/CN103278790B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050212506A1 (en) * | 2004-02-04 | 2005-09-29 | Khalin Vladimir M | Testing of current transformers |
| CN201514455U (en) * | 2009-09-04 | 2010-06-23 | 武汉市豪迈电力自动化技术有限责任公司 | CT/PT comprehensive test instrument for electric power |
| CN102621407A (en) * | 2012-04-27 | 2012-08-01 | 江苏省电力公司宿迁供电公司 | Method for measuring transformation ratio of transformer in power failure state |
| CN102780234A (en) * | 2012-08-08 | 2012-11-14 | 中国二十二冶集团有限公司 | High-voltage electric debugging method for power generation project |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646133A (en) * | 2016-01-18 | 2018-10-12 | 辛兴华 | A kind of production method of current transformer Check up polarity termination |
| CN109075557A (en) * | 2016-03-24 | 2018-12-21 | 力特有限公司 | More current sensor systems |
| CN106940391A (en) * | 2017-04-06 | 2017-07-11 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN106940391B (en) * | 2017-04-06 | 2019-04-12 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
| CN107271830B (en) * | 2017-05-25 | 2019-12-20 | 保定丰源电子科技有限公司 | Method for rapidly calculating transformation ratio of special transformer in unbalanced state |
| CN107271830A (en) * | 2017-05-25 | 2017-10-20 | 保定丰源电子科技有限公司 | A kind of no-load voltage ratio quick calculation method under special transformer non-equilibrium state |
| CN107167758A (en) * | 2017-07-11 | 2017-09-15 | 国网辽宁省电力有限公司沈阳供电公司 | Mutual inductor ratio, polarity tester with waveform display function |
| CN107167758B (en) * | 2017-07-11 | 2020-11-10 | 国网辽宁省电力有限公司沈阳供电公司 | Transformer ratio and polarity tester with waveform display function |
| CN107728092A (en) * | 2017-10-02 | 2018-02-23 | 国网山西省电力公司电力科学研究院 | The automatic precision pre-check device and method of calibration of Transformer Winding no-load voltage ratio tester |
| CN108732459A (en) * | 2018-03-23 | 2018-11-02 | 国网上海市电力公司 | A kind of current transformer polarity testing method |
| CN111077477A (en) * | 2019-10-27 | 2020-04-28 | 徐州和纬信电科技有限公司 | Line selection device and zero sequence current polarity detection and automatic correction method thereof |
| CN111257798A (en) * | 2020-01-16 | 2020-06-09 | 江苏广识电气有限公司 | Method for detecting polarity of zero-sequence current of line selection and automatically correcting |
| CN111257798B (en) * | 2020-01-16 | 2022-05-10 | 江苏广识电气有限公司 | Method for detecting polarity of zero sequence current of line selection and automatically correcting |
| CN111398644A (en) * | 2020-03-31 | 2020-07-10 | 贵州电网有限责任公司 | Mutual inductor handover test switching device and switching method thereof |
| CN112327016A (en) * | 2020-11-05 | 2021-02-05 | 国网湖北省电力有限公司宜昌供电公司 | Current transformer test wire box |
| CN113138336A (en) * | 2021-04-16 | 2021-07-20 | 西安热工研究院有限公司 | Test method for measuring voltage and power direction of generator by short route test in high plant |
| CN113138336B (en) * | 2021-04-16 | 2022-11-01 | 西安热工研究院有限公司 | Test method for measuring generator voltage and power direction in high-power transformer short-circuit test |
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| CN103278790B (en) | 2016-12-28 |
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