CN201096876Y - Online tester for current mutual inductor - Google Patents
Online tester for current mutual inductor Download PDFInfo
- Publication number
- CN201096876Y CN201096876Y CNU2007201020991U CN200720102099U CN201096876Y CN 201096876 Y CN201096876 Y CN 201096876Y CN U2007201020991 U CNU2007201020991 U CN U2007201020991U CN 200720102099 U CN200720102099 U CN 200720102099U CN 201096876 Y CN201096876 Y CN 201096876Y
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Abstract
The utility model relates to an on-line measuring instrument for the current transformer, which belongs to the measuring technology field. The on-line measuring instrument used for solving the on-line measuring problem of the current transformer. The utility model adopts the technical proposal that the on-line measuring instrument comprises a principal instrument and an extension set, the extension set is a clamp current meter which is connected at the primary side of the measured current transformer, the principal instrument is a clamp current meter which is connected at the secondary side of the e measured current transformer, the principal instrument and the extension set are both provided with a current detecting data processing circuit controlled through a microporocessor, and communicated through the wireless signal. The on-line measuring instrument has the advantages that not only the operation is convenient, fast and secure, but also the detecting precision is high.
Description
Technical field
The utility model relates to a kind of device that can online detection current transformer ratio, belongs to the detection technique field.
Background technology
Extensive employing current transformer is measured the alternating current in the power circuit in the electric system, and the size of the trueness error of current transformer is directly determining the accuracy of measuring.Owing to reasons such as the aging or artificial damages of mutual inductor, the no-load voltage ratio of current transformer in use might change in (such as the jaw dirt), causes current measurement inaccurate, therefore, is necessary current transformer is regularly detected.Owing to still there is not special detecting instrument at present, thereby the detection of current transformer is cumbersome, especially for the current transformer on the high-tension line, because online detection reading difficulty is dangerous high, just can detect after must dismantling, so not only testing intensity is big, length consuming time, but also can influence the normal operation of electrical network, also be difficult to guarantee accuracy of detection simultaneously.For these reasons, high-tension current inductor generally takes ability detection in several years at interval once at present.Therefore, design a kind of easy to operate, quick, safety, the current transformer on-line measuring device that measuring accuracy is high is very important.
Summary of the invention
The purpose of this utility model is to provide a kind of measuring accuracy height, easy to operate, quick, safe current transformer on-line detector.
The alleged problem of the utility model realizes with following technical proposals:
A kind of current transformer on-line detector, comprise main frame and extension set, described extension set is a pincers type reometer that is connected to tested current transformer primary side, described main frame is a pincers type reometer that is connected to tested Current Transformer Secondary side, main frame and extension set all are provided with the current detecting data processing circuit by microprocessor control, carry out communication by wireless signal between the two.
Above-mentioned current transformer on-line detector, described main frame current detecting data processing circuit is made up of current sampling circuit, signal amplification circuit, analog to digital converter U1, microprocessor CPU 1, keyboard JP, LCD display and wireless communication module U2, described current sampling circuit is made of pincers type mutual inductor CT1 and precision resistance R1 parallel connection, and pincers type mutual inductor CT1 is connected to the secondary side of tested current transformer; Described signal amplification circuit is made of operational amplifier F1 and four resistance, four resistance are respectively resistance R 2, resistance R 3, resistance R 4 and resistance R 5, wherein, operational amplifier F1, resistance R 2 and resistance R 3 are connected into the direct proportion amplifier, its signal output part connects the IN+ end of analog to digital converter U1, the output terminal of a termination current sampling circuit after resistance R 4 and resistance R 5 are connected in series, the reference voltage output terminal REFOUT of one termination analog to digital converter U1, their serial connection point connects the direct proportion amplifier input terminal; Data line D0～D7, the address wire A0 of described microprocessor CPU 1, A1, A2 and control line CS, RD, BUZY and HOLD connect the same inscription end of analog to digital converter U1 respectively, TXD and RXD end connect RXD and the TXD end of wireless communication module U2 respectively, the PORT1 mouth of microprocessor meets keyboard JP, and the PORT2 mouth connects LCD display.
Above-mentioned current transformer on-line detector, described extension set current detecting data processing circuit is installed in the table body 1 of extension set, form by the current sampling circuit, signal amplification circuit, analog to digital converter U3, microprocessor CPU 2 and the wireless communication module U4 that connect successively, described current sampling circuit is made of pincers type mutual inductor CT2 and precision resistance R6 parallel connection, and pincers type mutual inductor CT2 is connected to the primary side of tested current transformer; Described signal amplification circuit is made of operational amplifier F2 and four resistance, four resistance are respectively resistance R 7, resistance R 8, resistance R 9 and resistance R 10, wherein, operational amplifier F2, resistance R 7 and resistance R 8 are connected into the direct proportion amplifier, its signal output part connects the IN+ end of analog to digital converter U3, the output terminal of a termination current sampling circuit after resistance R 9 and resistance R 10 are connected in series, the reference voltage output terminal REFOUT of one termination analog to digital converter U3, their serial connection point connects the direct proportion amplifier input terminal; Data line D0～D7, the address wire A0 of described microprocessor CPU 2, A1, A2 and control line CS, RD, BUZY and HOLD connect the same inscription end of analog to digital converter U3 respectively, and TXD and RXD be RXD and the TXD end of termination wireless communication module U4 respectively.
Above-mentioned current transformer on-line detector, described extension set is made up of table body 1 and conductor clamp 2, described conductor clamp is by the movable clamp port that is hinged and decide jaw and form, both form closed-loop when the closure state position, it is affixed with the table body to decide jaw 3, and its special feature is: set up line-ball tongue 5, line-ball tongue is the semicircular that mates with the movable clamp port profile, a described line-ball tongue part is fixing with movable clamp port 4, and another part extends to deciding the jaw position.
Above-mentioned current transformer on-line detector, described table body bottom is provided with insulating bar 6, and insulating bar and table body are for removably connecting.
During the utility model work, send wireless control signal by main frame to extension set, extension set and main frame are measured the primary side current and the secondary side current of tested current transformer respectively by pincers type mutual inductor simultaneously, after measuring end, extension set is passed to main frame with the current data that records by wireless signal, by main frame primary side current and secondary side current data are handled, calculated the no-load voltage ratio of current transformer.Simultaneously, in order to prevent wiring error, main frame also will compare the phase place of primary side current and secondary side current, to confirm that primary side current belongs to mutually same with secondary side current.When using this device to detect, current transformer need not be dismantled, can not influence the normal operation of electrical network, extension set can be suspended on the hi-line with insulating bar 6, the operator need not be near the electric current of hi-line eye reading hi-line, do not have potential safety hazard, the operator only needs just can read testing result from the display of main frame from host keyboard input sense command.The utility model is not only easy to operate, quick, safety, and the accuracy of detection height.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the utility model schematic diagram;
Fig. 2 is the main frame electrical schematic diagram;
Fig. 3 is the extension set electrical schematic diagram;
Fig. 4 is the extension set structural representation.
Each label is among the figure: 1, table body; 2, conductor clamp; 3, decide jaw; 4, movable clamp port; 5, line-ball tongue; 5-1, line-ball tongue extension; 6, insulating bar; 7. hi-line; U1, analog to digital converter; U2, wireless communication module; U3, analog to digital converter; U4, wireless communication module; CPU1, microprocessor; CPU2, microprocessor; CT1, pincers type mutual inductor; CT2, pincers type mutual inductor; F1, operational amplifier; F2, operational amplifier; JP, keyboard; LCD, display.
Embodiment
Among Fig. 2, Fig. 3, the model of each module is: U1, ADS7864, U2, FC201SP, U3, ADS7864, U4, FC201SP, CPU1, CPU2,80C196KC.
Pincers type mutual inductor CT1 (CT2) gathers the current signal of Current Transformer Secondary side (primary side) among the figure, and it is changed into voltage signal on the resistance R 1 (R2), after the direct proportion amplifier that this signal is formed via F1, R2, R3 (F2, R7, R8) amplifies, enter the IN+ end of analog to digital converter U1 (U2), the effect of resistance R 4, R5 (R9, R10) is the level that promotes the input signal of direct proportion amplifier, make its permanent on the occasion of, capacitor C1 (C2) is the anti-interference capacitor of direct proportion amplifier input terminal.The simulating signal that enters analog to digital converter U1 (U2) changes into and is admitted to microprocessor CPU 1 (CPU2) after the digital signal and handles, and is calculated the current value and the phase place of secondary side (primary side) by CPU1 (CPU2).Analog to digital converter U1 (U2) is used for same extension set (main frame) and carries out communication.Keyboard JP is used to import sense command, and display lcd is used to show testing result.
The current transformer on-line detector course of work:
Main frame sends order by wireless communication module to extension set, starts extension set, the analog to digital converter of extension set is sampled (extension set is surveyed primary current), and the analog to digital converter of main frame is also sampled simultaneously.
After sampling was finished, main frame sent order by wireless communication module to extension set and finishes the extension set sampling, oneself also finishes sampling simultaneously, calculates secondary current, phase place.
Extension set is received and is finished to calculate primary current, phase place after the sample command, sends to main frame by wireless communication module afterwards.After main frame receives data, pass the primary current come and the secondary current that oneself calculates obtain current transformer as division arithmetic no-load voltage ratio with extension set.Phase place by main frame and branch computer relatively is the primary current and the secondary current of same current transformer.Judge whether current transformer has wiring error.
Referring to Fig. 4, comprise table body 1 and conductor clamp 2 during extension set constitutes, conductor clamp is by the movable clamp port 4 that is hinged and decide jaw 3 and form, the closed-loop of closure state formation between the two, this closed-loop can be the geometric configuration of circular, oval or other sealing, and it is affixed with the table body to decide jaw.Crucial part of the present utility model is to set up line-ball tongue 5, the semicircular that line-ball tongue is and the movable clamp port profile is mated (being semi-annular shape in the present embodiment), and a line-ball tongue part is fixing with movable clamp port 4, and another part is to deciding the extension of jaw position, as shown in Figure 3.Line-ball tongue extension 5-1 accounts for 1/2～2/3 of line-ball tongue integral body and is advisable.Be provided with the insulating bar 6 that holds for operating personnel in table body bottom, insulating bar and table body are for removably connecting.For ease of carrying, insulating bar can be connect by several pole pairs and form.Consider that from the angle of being convenient to operate conductor clamp axis and vertical direction angle β are 30 °～45 °.
When extension set uses, install insulating bar earlier, pull movable clamp port then to state shown in Figure 3, lift insulating bar, make hi-line 7 enter moving, decide line-ball tongue bottom between the jaw, unclamp hand, pincerlike meter is sagging naturally under action of gravity, press line-ball tongue to hi-line, move on the line-ball tongue, drive the movable clamp port closure.In testing process, be subjected to the acting force of hi-line all the time, so conductor clamp can not opened owing to line-ball tongue.Detection finishes, and upwards touches insulating bar, and the movable clamp port bottom is contacted with hi-line, is subjected to downward power effect, and movable clamp port opens, and pincerlike meter can take off.
The built-in lithium ion battery of main frame and extension set, the scene need not external power supply.
Claims (5)
1. current transformer on-line detector, it is characterized in that, it comprises main frame and extension set, described extension set is a pincers type reometer that is connected to tested current transformer primary side, described main frame is a pincers type reometer that is connected to tested Current Transformer Secondary side, main frame and extension set all are provided with the current detecting data processing circuit by microprocessor control, carry out communication by wireless signal between the two.
2. according to the described current transformer on-line detector of claim 1, it is characterized in that, described main frame current detecting data processing circuit is made up of the current sampling circuit, signal amplification circuit, analog to digital converter (U1), microprocessor (CPU1), keyboard (JP), LCD display and the wireless communication module (U2) that connect successively, described current sampling circuit is by pincers type mutual inductor (CT1) and precision resistance (R1) formation in parallel, and pincers type mutual inductor (CT1) is connected to the secondary side of tested current transformer; Described signal amplification circuit is made of operational amplifier (F1) and four resistance, four resistance are respectively resistance (R2), resistance (R3), resistance (R4) and resistance (R5), wherein, operational amplifier (F1), resistance (R2) and resistance (R3) are connected into the direct proportion amplifier, its signal output part connects the IN+ end of analog to digital converter (U1), the output terminal of a termination current sampling circuit after resistance (R4) and resistance (R5) are connected in series, the reference voltage output terminal REFOUT of one termination analog to digital converter (U1), their serial connection point connects the direct proportion amplifier input terminal; The data line D0 of described microprocessor (CPU1)～～D7, address wire A0, A1, A2 and control line CS, RD, BUZY and HOLD connect the same inscription end of analog to digital converter U1 respectively, TXD and RXD end connect the RXD and the TXD end of wireless communication module (U2) respectively, the PORT1 mouth of microprocessor connects keyboard (JP), and the PORT2 mouth connects LCD display.
3. according to claim 1 or 2 described current transformer on-line detectors, it is characterized in that, described extension set current detecting data processing circuit is installed in the table body (1) of extension set, form by the current sampling circuit, signal amplification circuit, analog to digital converter (U3), microprocessor CPU 2 and the wireless communication module (U4) that connect successively, described current sampling circuit is by pincers type mutual inductor (CT2) and precision resistance (R6) formation in parallel, and pincers type mutual inductor (CT2) is connected to the primary side of tested current transformer; Described signal amplification circuit is made of operational amplifier (F2) and four resistance, four resistance are respectively resistance (R7), resistance (R8), resistance (R9) and resistance (R10), wherein, operational amplifier (F2), resistance (R7) and resistance (R8) are connected into the direct proportion amplifier, its signal output part connects the IN+ end of analog to digital converter (U3), the output terminal of a termination current sampling circuit after resistance (R9) and resistance (R10) are connected in series, the reference voltage output terminal REFOUT of one termination analog to digital converter (U3), their serial connection point connects the direct proportion amplifier input terminal; Data line D0～D7, the address wire A0 of described microprocessor (CPU2), A1, A2 and control line CS, RD, BUZY and HOLD connect the same inscription end of analog to digital converter (U3) respectively, and TXD and RXD be the RXD and the TXD end of termination wireless communication module (U4) respectively.
4. according to the described current transformer on-line detector of claim 3, it is characterized in that, described extension set is made up of table body (1) and conductor clamp (2), described conductor clamp is by the movable clamp port that is hinged and decide jaw and form, and both form closed-loop when the closure state position, decide jaw (3) and show body affixed, set up line-ball tongue (5), the semicircular that line-ball tongue is and the movable clamp port profile is mated, a described line-ball tongue part is fixing with movable clamp port (4), and another part extends to deciding the jaw position.
5. according to the described current transformer on-line detector of claim 4, it is characterized in that described table body bottom is provided with insulating bar (6), insulating bar and table body are for removably connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201020991U CN201096876Y (en) | 2007-07-31 | 2007-07-31 | Online tester for current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201020991U CN201096876Y (en) | 2007-07-31 | 2007-07-31 | Online tester for current mutual inductor |
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| Publication Number | Publication Date |
|---|---|
| CN201096876Y true CN201096876Y (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201020991U Expired - Fee Related CN201096876Y (en) | 2007-07-31 | 2007-07-31 | Online tester for current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096876Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769958A (en) * | 2010-02-11 | 2010-07-07 | 北京国能子金电气技术有限公司 | High-voltage capacitor bank branch current monitoring device |
| CN102012447A (en) * | 2010-10-12 | 2011-04-13 | 邢台供电公司 | Telescopic clip-on ammeter |
| CN102012493A (en) * | 2010-10-28 | 2011-04-13 | 国网电力科学研究院 | GPS (global position system) wireless calibration tester for electronic mutual inductor |
| CN103969546A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarities of four-star voltage transformers |
| CN104215927A (en) * | 2014-09-02 | 2014-12-17 | 国家电网公司 | Multifunctional mutual inductor tester |
| CN108226579A (en) * | 2016-11-20 | 2018-06-29 | 国网江西省电力公司赣东北供电分公司 | A kind of Novel bunk current voltage is mutually than the automatic plug binding clip device of tester |
| CN109298232A (en) * | 2018-11-26 | 2019-02-01 | 国网江苏省电力有限公司镇江供电分公司 | Current imbalance detection system and detection method based on user's measurement loop failure |
| CN111398696A (en) * | 2019-12-27 | 2020-07-10 | 国网浙江省电力有限公司金华供电公司 | On-spot quick tester of current transformer transformation ratio |
-
2007
- 2007-07-31 CN CNU2007201020991U patent/CN201096876Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769958A (en) * | 2010-02-11 | 2010-07-07 | 北京国能子金电气技术有限公司 | High-voltage capacitor bank branch current monitoring device |
| CN101769958B (en) * | 2010-02-11 | 2012-07-25 | 北京国能子金电气技术有限公司 | High-voltage capacitor bank branch current monitoring device |
| CN102012447A (en) * | 2010-10-12 | 2011-04-13 | 邢台供电公司 | Telescopic clip-on ammeter |
| CN102012493A (en) * | 2010-10-28 | 2011-04-13 | 国网电力科学研究院 | GPS (global position system) wireless calibration tester for electronic mutual inductor |
| CN103969546A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarities of four-star voltage transformers |
| CN103969546B (en) * | 2013-01-30 | 2016-12-07 | 江苏省电力公司常州供电公司 | Four wye voltage transformer secondary polarity intelligent testers |
| CN104215927A (en) * | 2014-09-02 | 2014-12-17 | 国家电网公司 | Multifunctional mutual inductor tester |
| CN108226579A (en) * | 2016-11-20 | 2018-06-29 | 国网江西省电力公司赣东北供电分公司 | A kind of Novel bunk current voltage is mutually than the automatic plug binding clip device of tester |
| CN108226579B (en) * | 2016-11-20 | 2023-10-27 | 国网江西省电力公司赣东北供电分公司 | Novel automatic plug binding clip device of high-low voltage current mutual ratio tester |
| CN109298232A (en) * | 2018-11-26 | 2019-02-01 | 国网江苏省电力有限公司镇江供电分公司 | Current imbalance detection system and detection method based on user's measurement loop failure |
| CN111398696A (en) * | 2019-12-27 | 2020-07-10 | 国网浙江省电力有限公司金华供电公司 | On-spot quick tester of current transformer transformation ratio |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20110731 |