CN104502791A - Current transformer secondary wiring line inspection device - Google Patents
Current transformer secondary wiring line inspection device Download PDFInfo
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- CN104502791A CN104502791A CN201410589902.3A CN201410589902A CN104502791A CN 104502791 A CN104502791 A CN 104502791A CN 201410589902 A CN201410589902 A CN 201410589902A CN 104502791 A CN104502791 A CN 104502791A
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- current transformer
- line inspection
- transformer secondary
- inspection device
- switching device
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Abstract
The invention is suitable to be used in the technical field of electric power detection, and provides a current transformer secondary wiring line inspection device. The device comprises a display circuit and a detection circuit. The display circuit comprises a first power supply, a prompt device and a switching device forming a series circuit. The output end of the detection is connected with the control end of the switching device. The detection circuit leads out two measuring terminals. When a to-be-detected wire connected with the two measuring terminals is not a coil, under the control of the detection circuit, the switching device is connected. The device is simple in structure. When the device is used, an inspector does not need to dismount wires, and after connecting the two measuring terminals in the to-be-detected wire, according to the working state of the prompt device, the device can accurately and rapidly inspect the wire.
Description
Technical field
The invention belongs to technical field of electric power detection, particularly relate to a kind of Current Transformer Secondary distribution line inspection device.
Background technology
Current transformer is made according to electromagnetic induction principle.Current transformer is made up of the iron core closed and winding.An its distribution umber of turn is little, and go here and there in the circuit needing the electric current measured, secondary distribution umber of turn is many, is serially connected in measurement instrument or protective loop.Operationally, its secondary circuit is closed to current transformer all the time, and therefore the impedance of measurement instrument and protective loop series coil is very little, and the duty of current transformer is close to short circuit.Current transformer is that a big current is converted to secondary small area analysis to use, and secondary can not be opened a way.
The secondary distribution line inspection of estimated current mutual inductor, general passing through manually is taken out stitches inspection or adopts the examination lamp testing device inspection be made up of bulb and battery.Inspection of manually taking out stitches can increase workload, thus reduces work efficiency.Check according to examination lamp testing device, can only be distinguished by the brightness of bulb, but make with the naked eye to distinguish the method for brightness and unreliable, add potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Current Transformer Secondary distribution line inspection device, is intended to solve existing Current Transformer Secondary distribution and manually takes out stitches line inspection method inefficiency and the technical matters that the accuracy of examination lamp testing device inspection method is not high.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Described Current Transformer Secondary distribution line inspection device comprises display circuit and testing circuit, described display circuit comprises the first power supply, prompting device and the switching device that form series loop, the output terminal of described testing circuit is connected to the control end of the switching device of display circuit, two measurement terminal are led in testing circuit, when the wire to be checked that two measurement terminal connect is not coil, under the control of described testing circuit, described switch device conductive;
Described testing circuit comprises second source, divider resistance and two measurement terminal, when two measurement terminal are connected by wire to be checked, the series loop of described second source, divider resistance composition, the voltage that described divider resistance is got inputs to the control end of described switching device;
Described switching device is the insulated gate bipolar transistor IGBT comprising grid, collector, emitter, the grid of point compression bonded line two ends access insulated gate bipolar transistor IGBT of described slide rheostat and emitter, and grid voltage is greater than emitter voltage, after described first power supply and prompting devices in series, be linked into the collector and emitter of insulated gate bipolar transistor IGBT.
Further improvement of the present invention is: described divider resistance is slide rheostat.
Described first power supply and second source are direct supply.Described prompting device is bulb or hummer.
Owing to adopting technique scheme, the technical progress acquired by the present invention is:
The invention provides a kind of Current Transformer Secondary distribution line inspection device, comprise display circuit and testing circuit, described testing circuit leads to two measurement terminal, described two measurement terminal access wire to be checked, when wire to be checked is not coil, between two measurement terminal, impedance is very little, and now testing circuit exports the switching device in start signal unlatching display circuit, prompting devices function; If wire to be checked is coil, be Current Transformer Secondary distribution, so there is a constant impedance between two measurement terminal, now testing circuit does not export start signal, or the signal exported is less, is not enough to open described switching device, device is now pointed out not work; So by observing prompting devices function, whether supervisory personnel can judge whether current wire to be checked is secondary distribution.Apparatus of the present invention structure is simple, by using this device, and just can the accurately line inspection fast when not taking out stitches.
Accompanying drawing explanation
Fig. 1 is current transformer schematic diagram;
Fig. 2 is the schematic diagram of the Current Transformer Secondary distribution line inspection device that the embodiment of the present invention provides;
Fig. 3 is a kind of circuit structure diagram of the Current Transformer Secondary distribution line inspection device that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details:
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
Fig. 2 shows the theory structure of the Current Transformer Secondary distribution line inspection device that the embodiment of the present invention provides, and illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The Current Transformer Secondary distribution line inspection device that the embodiment of the present invention provides comprises display circuit and testing circuit, described display circuit 1 comprises the first power supply Eb, the prompting device Lm and switching device S of composition series loop, the output terminal of described testing circuit is connected to the control end of described switching device S, two measurement terminal a, b are led in described testing circuit 2, when the wire to be checked that described two measurement terminal connect is not coil, under the control of described testing circuit, described switch device conductive.
When using this device, by connecting wire, described two measurement terminal are connected to wire two ends to be checked, when described wire to be checked is not coil, impedance now between two measurement terminal is very little, now testing circuit exports the switching device in start signal unlatching display circuit, now points out devices function; If wire to be checked is coil, so there is a constant impedance between two measurement terminal, now testing circuit does not export start signal, or the signal exported is less, is not enough to open described switching device, now points out device not work; So by observing prompting devices function, whether supervisory personnel can judge whether current wire to be checked is secondary distribution.Apparatus of the present invention structure is simple, by using this device, when not taking out stitches, and can the accurately line inspection fast.The present embodiment does not limit the concrete structure of testing circuit, as long as export different signal to switching device according to the impedance magnitude difference between two measurement terminal, with open or the technical scheme of closing switch device all within protection scope of the present invention.Such as can adopt single-chip microcomputer, different according to the resistance sizes detected, export corresponding control signal; Also can work as the electronics size detecting between measurement terminal when being greater than certain numerical value, single-chip microcomputer exports cut-in voltage signal, otherwise does not output signal; For another example directly by the series loop in two measurement terminal detection circuit for access, relevant voltage signal can also be exported to open described switching device by dividing potential drop.The present embodiment does not limit concrete implementation.
As a kind of actual circuit structure of testing circuit, as shown in Figure 3, comprise second source Ea, a divider resistance Xm and two measurement terminal a, b, when described two measurement terminal are connected, described second source Ea, divider resistance Xm form series loop, and the voltage that described divider resistance Xm divides inputs to the control end of described switching device.In the present embodiment, described switching device is semiconductor switch device, can be such as LGBT, triode, metal-oxide-semiconductor etc., when described wire to be checked is not coil, impedance now between two measurement terminal is very little, the voltage swing that described divider resistance is got is greater than the cut-in voltage of semiconductor switch device, now semiconductor switch device conducting, prompting devices function; When described wire to be checked is coil, existence one constant impedance now between two measurement terminal, the undertension that divider resistance is got, to open semiconductor switch device, now points out device not work.Therefore can identify wire type by this simple dividing potential drop mode, complete line inspection work.
Be further used as a kind of preferred implementation, described divider resistance Xm is slide rheostat, for dissimilar current transformer, its secondary distribution impedance may be inconsistent, even if may occur that current wire to be checked is coil, because its impedance magnitude is smaller, the voltage that now divider resistance is still got also can open semiconductor switch device, causes erroneous judgement.Therefore slide rheostat is adopted here, can regulating resistance size, to get enough voltage.Slide rheostat can by adjusting dividing potential drop thus adjusting the sensitivity that coil can be detected.
Enumerate as a kind of instantiation in the present embodiment, described switching device is insulated gate bipolar transistor IGBT, and IGBT is a kind of logic break-make components and parts, comprises grid G, collector C, emitter E, the grid G of point compression bonded line two ends access IGBT of described slide rheostat and emitter E, and U
gEfor just, after described first power supply Eb and prompting device Lm series connection, be linked into collector C and the emitter E of IGBT.
It is voltage U by between grid G and emitter E that IGBT turns on and off
gEdetermine, work as U
gEfor just and be greater than cut-in voltage U
gE (th)time, IGBT conducting.Apply when between grid G and emitter E in the other direction voltage or not making alive time, IGBT turns off.U
gE (th)value be generally 2 ~ 6V.Therefore when specific implementation, arrange suitable second source and regulate slide rheostat, make when the wire to be checked of measurement terminal access is not for coil, slide rheostat dividing potential drop is greater than U
gE (th); And when the wire to be checked of measurement terminal access is coil, slide rheostat dividing potential drop is less than U
gE (th).Here the first power supply Eb and second source Ea is equal direct supply.
Finally, the present embodiment does not limit the specific implementation form of prompting device, can be bulb, hummer etc., as long as at prompting devices function with when not working, demonstrate different states, supervisory personnel's identifiable design.
To sum up, Current Transformer Secondary distribution line inspection device provided by the invention, structure is simple, supervisory personnel is without the need to taking out stitches, only two measurement terminal must be accessed wire to be checked, whether be coil, improve work efficiency if can determine wire to be checked according to the duty of prompting device.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a Current Transformer Secondary distribution line inspection device, it is characterized in that: described line inspection device comprises display circuit (1) and testing circuit (2), described display circuit comprises the first power supply Eb, prompting device and the switching device that form series loop, the output terminal of described testing circuit is connected to the control end of the switching device of display circuit, two measurement terminal are led in testing circuit, when the wire to be checked that two measurement terminal connect is not coil, under the control of described testing circuit, described switch device conductive;
Described testing circuit comprises second source, divider resistance and two measurement terminal, when two measurement terminal are connected by wire to be checked, the series loop of described second source, divider resistance composition, the voltage that described divider resistance is got inputs to the control end of described switching device;
Described switching device is the insulated gate bipolar transistor IGBT comprising grid, collector, emitter, the grid of point compression bonded line two ends access insulated gate bipolar transistor IGBT of described slide rheostat and emitter, and grid voltage is greater than emitter voltage, after described first power supply and prompting devices in series, be linked into the collector and emitter of insulated gate bipolar transistor IGBT.
2. Current Transformer Secondary distribution line inspection device according to claim 1, is characterized in that: described divider resistance is slide rheostat.
3. Current Transformer Secondary distribution line inspection device according to any one of claims 1 or 2, is characterized in that: described first power supply and second source are direct supply.
4. Current Transformer Secondary distribution line inspection device according to any one of claims 1 or 2, is characterized in that: described prompting device is bulb or hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410589902.3A CN104502791A (en) | 2014-10-29 | 2014-10-29 | Current transformer secondary wiring line inspection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410589902.3A CN104502791A (en) | 2014-10-29 | 2014-10-29 | Current transformer secondary wiring line inspection device |
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| Publication Number | Publication Date |
|---|---|
| CN104502791A true CN104502791A (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410589902.3A Pending CN104502791A (en) | 2014-10-29 | 2014-10-29 | Current transformer secondary wiring line inspection device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110188159A1 (en) * | 2008-09-24 | 2011-08-04 | Abb Research Ltd. | Method and device for supervising secondary circuit of instrument transformer in power system |
| CN202486254U (en) * | 2012-03-14 | 2012-10-10 | 山西省电力公司电力科学研究院 | Secondary circuit detection system of current mutual inductor |
| CN203241501U (en) * | 2013-05-13 | 2013-10-16 | 国家电网公司 | Secondary wiring homopolarity detector |
| CN103592561A (en) * | 2013-11-19 | 2014-02-19 | 国家电网公司 | Device for detecting current mutual inductor secondary wiring |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
-
2014
- 2014-10-29 CN CN201410589902.3A patent/CN104502791A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110188159A1 (en) * | 2008-09-24 | 2011-08-04 | Abb Research Ltd. | Method and device for supervising secondary circuit of instrument transformer in power system |
| CN202486254U (en) * | 2012-03-14 | 2012-10-10 | 山西省电力公司电力科学研究院 | Secondary circuit detection system of current mutual inductor |
| CN203241501U (en) * | 2013-05-13 | 2013-10-16 | 国家电网公司 | Secondary wiring homopolarity detector |
| CN103592561A (en) * | 2013-11-19 | 2014-02-19 | 国家电网公司 | Device for detecting current mutual inductor secondary wiring |
| CN103954883A (en) * | 2014-05-21 | 2014-07-30 | 中国化学工程第十一建设有限公司 | Voltage transformer secondary connection inspecting method and device |
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Application publication date: 20150408 |
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