CN103472357A - Polarity detecting device of current transformer - Google Patents
Polarity detecting device of current transformer Download PDFInfo
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- CN103472357A CN103472357A CN2013103734248A CN201310373424A CN103472357A CN 103472357 A CN103472357 A CN 103472357A CN 2013103734248 A CN2013103734248 A CN 2013103734248A CN 201310373424 A CN201310373424 A CN 201310373424A CN 103472357 A CN103472357 A CN 103472357A
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Abstract
The invention discloses a polarity detecting device of a current transformer. The polarity detecting device comprises a direct-current power supply and a polarity displaying circuit, wherein the direct-current power supply is connected with a primary-side terminal I and a primary-side terminal II of the current transformer; the polarity displaying circuit is connected in series between a secondary-side terminal I and a secondary-side terminal II; a switching circuit is connected between a positive electrode and a negative electrode of the direct-current power supply and comprises a forward conducting switch and a reverse conducting switch; the switching circuit is connected with two wiring posts, namely a wiring post I and a wiring post II; when the forward switch is switched on, the positive electrode of the direct-current power supply is connected with the wiring post I, and the negative electrode of the direct-current power supply is connected with the wiring post II; when reverse switch is switched on, the polarities of the direct-current power supply connected into the wiring post I and the wiring post II are exchanged. The wiring post I and the wiring post II are externally connected with the primary-side terminal I and the primary-side terminal II of the current transformer. The polarity detecting device disclosed by the invention has the advantages that the polarities of the direct-current power supply connected into the two primary-side terminals of the current transformer are directly exchanged by the switching circuit, the use is convenient and the circuit is simple.
Description
Technical field
The present invention relates to pick-up unit, particularly a kind of current transformer device for detecting polarity.
Background technology
Current transformer is done to measure while using, for the electric current of electric system metering and measurement operational outfit; Do when protection is used to coordinate with the protective relaying device in electric system, be short-circuited in electric system, provide shutoff signal to protective relaying device during the fault such as overload, protect the safety of electric power system.Misdeem and misunderstand the 180 ° of variations of phase place generation that cause the Current Transformer Secondary side in current transformer polarity, and send contrary signal to protective relaying device, cause the misoperation of protective relaying device.At present, the detection of current transformer polarity is mainly that while utilizing battery access current transformer primary side terminal, current break causes that the deflection of the pointer multimeter that the secondary side terminal connects judges.The positive pole of the deflection side corresponding current mutual inductor secondary side terminal electric current of described pointer multimeter pointer, but the secondary side winding resistance difference of different current transformers, the deflection amplitude difference of pointer multimeter, be unfavorable for observation.Therefore there is the patent that the open application number of China is 201220201328.6 to propose a kind of instrument for testing polarity of current transformer, mainly by the signal place in circuit, electric current forward conduction circuit and electric current reverse-conducting circuit are distinguished, then judge the direction of current signal by signal processing circuit, thereby the polarity of judgement current transformer, but in this patent, electron device that circuit connects is more, circuit is comparatively complicated.What is more important, because detecting test, current transformer polarity usually need to repeatedly change the correctness that the polarity of the battery of access current transformer is carried out demonstration test, but this patent not mentioned mode of just repeatedly changing the polarity of battery access current transformer primary side terminal, in the situation that manually change the dismounting trouble and easily make mistakes.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of current transformer device for detecting polarity, directly changes the polarity of direct supply access current transformer primary side by forward conduction switch and reverse-conducting switching over, and easy to use, circuit is simple.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of current transformer device for detecting polarity, comprise direct supply and polarity display circuit, described direct supply connects primary side terminal I and the primary side terminal II of a current transformer, series connection polarity display circuit between the secondary side terminal I of current transformer and secondary side terminal II, connect a switching circuit between described DC power anode and negative pole, described commutation circuit comprises a forward conduction switch and a reverse-conducting switch, described commutation circuit connects two binding posts and is respectively binding post one and binding post two, described forward conduction switch closure, the positive pole of direct supply connects binding post one, the negative pole of direct supply connects binding post two, described reverse-conducting switch closure, the positive pole of direct supply connects binding post two, the negative pole of direct supply connects binding post one, described binding post one and binding post two external impressed current mutual inductor primary side terminal I and primary side terminal II.The secondary side terminal I of described current transformer is corresponding to primary side terminal I, and the secondary side terminal II is corresponding to the primary side terminal II.At the primary side terminal of current transformer, with the secondary side terminal, be connected when correct, if forward conduction switch closure, the positive pole of direct supply connects binding post one, DC power cathode connects binding post two, the forward circuit conducting, polarity display circuit display circuit forward conduction, and can judge the now polarity of Current Transformer Secondary side terminal; If reverse-conducting switch closure, DC power anode connects binding post two, and DC power cathode connects binding post one, the negater circuit conducting, and polarity display circuit display circuit reverse-conducting, and can judge the now polarity of Current Transformer Secondary side terminal.Without manual dismounting direct supply be the polarity of interchangeable direct supply access current transformer primary side, easy to use.
As preferably, described forward conduction switch and reverse-conducting switch are double-pole single throw, be respectively double-pole single throw I and double-pole single throw II, it is joint one that described double-pole single throw I has four auxiliary joints, joint two, joint three and joint four, described joint one connects DC power anode, joint two connects binding post one, described joint three connects DC power cathode, joint four connects binding post two, four auxiliary joints of described double-pole single throw II are joint five, joint six, joint seven and joint eight, described joint five connects DC power cathode, described joint six connects binding post one, described joint seven connects DC power anode, described joint eight connects binding post two, primary side terminal I and the primary side terminal II of described binding post one and binding post two external impressed current mutual inductors.The double-pole single throw wiring is simple, and circuit has been divided into to the two-way of forward conduction and reverse-conducting during wiring.
As preferably, described polarity display circuit input end connects two binding posts, be respectively binding post three and binding post four, described polarity display circuit comprises two LED light, be respectively forward LED light and reverse LED light, anodal and the reverse LED light negative pole of described forward LED light is connected, tie point is connected in binding post three, described forward LED light negative pole and the oppositely anodal series connection of LED light, tie point is connected in binding post four, and described binding post three and binding post connect secondary side terminal I and the secondary side terminal II of current transformer all round.Primary side terminal and secondary side connecting terminals wrong at current transformer are mistaken, and circuit can't conducting, and whether the polarity display circuit or not the situation, and now the user makes circuit turn-on by the position of transposing Current Transformer Secondary side terminal.At the primary side terminal of current transformer, with the secondary side terminal, be connected when correct, if electric current forward conduction, the forward LED light lights, if electric current reverse-conducting, oppositely LED light lights, by observation, be that the forward LED light lights or oppositely LED light lights and judges the now polarity of Current Transformer Secondary side terminal I and secondary side terminal II, intuitive display, be difficult for causing misjudgment.If forward LED light and reverse LED light all do not light, show not conducting of circuit, Current Transformer Secondary side terminal connection error, the position of need transposing Current Transformer Secondary side terminal and binding post three and binding post four.
As preferably, also be provided with a pointer multimeter, described pointer multimeter has two terminals, and terminals connect the tie point of described forward LED light negative pole and the anodal series connection of reverse LED light, and another terminals are connected in binding post four.After circuit is connected, conducting lights according to current direction for forward LED light and reverse LED light, and the deflection of respective direction also occurs pointer multimeter simultaneously.If LED light during circuit turn-on on respective branch does not light, can judge by the deflection of pointer multimeter the polarity of the secondary side terminal of current transformer, pointer multimeter also can be used as an assistant display device, the situation of being convenient to LED light is shown is checked, and guarantees the accuracy of current transformer polarity judgement.
As preferably, also comprise a housing, described housing is provided with a panel, and described forward conduction switch, reverse-conducting switch, binding post one, binding post two, binding post three, binding post four, forward LED light, reverse LED light and pointer multimeter all are arranged on described panel.The connection circuit of described current transformer device for detecting polarity all is placed in described housing, is convenient to take and carry operation.Described forward conduction switch, reverse-conducting switch, binding post one, binding post two, binding post three, binding post four, forward LED light, reverse LED light and pointer multimeter all are arranged on described panel, be convenient to wiring and operation, easy to use.
As preferably, described direct supply is dry cell.Dry cell is easy to carry and installation is easy.
As preferably, described housing is provided with a battery case, and described dry cell is arranged in described battery case.Dry cell can be taken out in used time not, avoid in the long-term placing battery groove of dry cell, get rusty because of moist, affect the normal use of device.
After adopting technique scheme, the present invention has following advantage:
By the switching closure of forward conduction switch and reverse-conducting switch, can directly change the polarity of the primary side terminal of direct supply access current transformer, without the dismounting of carrying out direct supply repeated, easy to use, circuit is simple, is easy to realize.
Described forward LED light and reverse LED light can make respectively circuit forward and reverse-conducting, and intuitive display, be conducive to the judgement of the secondary side terminal polarity of current transformer.Described forward LED light and reverse LED light all do not show, the secondary side terminal connection error of current transformer is described, need transposing and position that the secondary side terminal connects.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is principle of the invention wiring diagram;
Fig. 2 is that the polarity display circuit is the circuit interconnect pattern of LED light;
Fig. 3 is that the polarity display circuit is the circuit interconnect pattern of LED light and pointer multimeter;
Fig. 4 is panel layout of the present invention.
Embodiment
As shown in Figure 1-2, a kind of current transformer device for detecting polarity, comprise direct supply 2 and polarity display circuit, described direct supply 2 connects primary side terminal I P1 and the primary side terminal II P2 of a current transformer 1, series connection polarity display circuit between the secondary side terminal I S1 of current transformer and secondary side terminal II S2, be connected a switching circuit between described DC power anode and negative pole, described commutation circuit comprises a forward conduction switch 31 and a reverse-conducting switch 32, described commutation circuit connects two binding posts and is respectively binding post 1 and binding post 25, described forward conduction switch 31 closures, the positive pole of direct supply 2 connects binding post 1, the negative pole of direct supply 2 connects binding post 25, described reverse-conducting switch 32 closures, the positive pole of direct supply 2 connects binding post 25, the negative pole of direct supply 2 connects binding post 1, the primary side terminal I P1 of described binding post 1 and binding post 25 external impressed current mutual inductors 1 and primary side terminal II P2.In this preferred embodiment, described forward conduction switch 31 and reverse-conducting switch 32 are double-pole single throw, are respectively double-pole single throw I and double-pole single throw II.Described double-pole single throw I and double-pole single throw II are divided into forward conduction and two parts of reverse-conducting by circuit, are not prone to the problem of misconnection.It is joint one K1 that described double-pole single throw I has four auxiliary joints, joint two K2, joint three K3 and joint four K4, described joint one K1 connects direct supply 2 positive poles, joint two K2 connect binding post 1, described joint three K3 connect direct supply 2 negative poles, joint four K4 connect binding post 25, four auxiliary joints of described double-pole single throw II are joint five K5, joint six K6, joint seven K7 and joint eight K8, described joint five K5 connect direct supply 2 negative poles, described joint six K6 connect binding post 1, described joint seven K7 connect DC power anode, described joint eight K8 connect binding post 25, the primary side terminal I P1 of described binding post 1 and binding post 25 external impressed current mutual inductors 1 and primary side terminal II P2.The secondary side terminal I S1 of described current transformer is corresponding to primary side terminal I P1, and secondary side terminal II S2 is corresponding to primary side terminal II P2.The primary side terminal I P1 that supposes current transformer 1 connects binding post 1, the correct mode of connection should be that primary side terminal II P2 connects binding post 25, the secondary side terminal I S1 of described current transformer connects binding post 36, and secondary side terminal II S2 connects binding post 47.If be connected with the secondary side terminal when correct at the primary side terminal of current transformer, double-pole single throw I closure, the positive pole of direct supply connects binding post 1, DC power cathode connects binding post 25, the forward circuit conducting, polarity display circuit display circuit forward conduction, and can judge that now Current Transformer Secondary side terminal I S1 is for anodal, Current Transformer Secondary side terminal II S2 is negative pole; If double-pole single throw II closure, DC power anode connects binding post 25, DC power cathode connects binding post 1, the negater circuit conducting, polarity display circuit display circuit reverse-conducting, and can judge that now Current Transformer Secondary side terminal I S1 is negative pole, Current Transformer Secondary side terminal II S2 is anodal.Without manual dismounting direct supply 2 be the polarity of interchangeable direct supply 2 access current transformer primary sides, easy to use.As preferably, described direct supply 2 is dry cell, carries with easy for installation.
Referring to Fig. 2, described polarity display circuit input end connects two binding posts, is respectively binding post 36 and binding post 47.As preferably, described polarity display circuit comprises two LED light, be respectively forward LED light LED1 and reverse LED light LED2, the positive pole of described forward LED light LED1 and the oppositely negative pole series connection of LED light LED2, tie point is connected in binding post 36, the negative pole of described forward LED light LED1 and the oppositely positive pole series connection of LED light LED2, tie point is connected in binding post 47, secondary side terminal I S1 and the secondary side terminal II S2 of described binding post 36 and binding post 47 external impressed current mutual inductors 1.If current transformer 1 secondary side terminal connects not corresponding with the primary side terminal, for example, in front in described example, if the primary side terminal of current transformer connects secondary side terminal I S1 connection binding post 47 in constant situation, secondary side terminal II S2 connects binding post 36 o'clock, and circuit can't conducting.Use two LED light, when forward LED light LED1 does not all light with reverse LED light LED2, show not conducting of circuit, be Current Transformer Secondary side terminal connection error, can remind the user to change the position of secondary side terminal I S1 and secondary side terminal II S2 and binding post 36 and the binding post 47 of current transformer.At the terminal of the terminal of the primary side of current transformer and secondary side, be connected when correct, if electric current forward conduction, forward LED light LED1 lights, if electric current reverse-conducting, reverse LED light lights LED2 and lights, by observation, be that forward LED light LED1 lights or oppositely LED light LED2 lights and judges the now polarity of Current Transformer Secondary side terminal I and secondary side terminal II, intuitive display, be difficult for causing misjudgment.
Also can connect again a pointer multimeter 33 on the basis that is LED light at Fig. 2 polarity display circuit, can be referring to Fig. 3.Particularly, described pointer multimeter 33 has two terminals, and terminals connect the tie point of described forward LED light LED1 negative pole and the anodal series connection of reverse LED light LED2, and another terminals are connected in binding post 47.After circuit is connected, conducting lights according to current direction for forward LED light LED1 and reverse LED light LED2, and the deflection of respective direction also occurs pointer multimeter 33 simultaneously.If during circuit turn-on on respective branch LED light but do not light, the polarity of the secondary side terminal of deflection judgement current transformer that can be by pointer multimeter 33.The direction of the deflection of described pointer multimeter 33 pointers is the electric current forward.In forward LED light LED1 and reverse LED light LED2 indication all in normal situation, described pointer multimeter 33 also can be used as an assistant display device, the situation of being convenient to LED light is shown is checked, and guarantees the accuracy of current transformer polarity judgement.
In Fig. 1-4, the connection circuit of described current transformer device for detecting polarity is placed in a housing, is convenient to taking and operating of device.Referring to Fig. 4, described housing is provided with a panel, and described forward conduction switch 31, reverse-conducting switch 32, binding post 1, binding post 25, binding post 36, binding post 47, forward LED light LED1, reverse LED light LED2 and pointer multimeter 33 all are arranged on described panel.In this preferred embodiment, described forward conduction switch 31 and reverse-conducting switch 32 have respectively red and green sign on panel, corresponding forward LED light LED1 and reverse LED light LED2 also are respectively red LED light and green LED light, show unanimously, be difficult for causing the polarity misjudgment.Each function of current transformer device for detecting polarity is concentrated on panel to the observation of convenient operation and LED light state.Also be provided with a battery case on described housing, described dry cell is arranged in described battery case.Dry cell can be taken out in used time not, avoid getting rusty because of moist in the long-term placing battery groove of dry cell, affect the normal use of device.
Except above preferred embodiment, the present invention also has other embodiment, and those skilled in the art can make according to the present invention various changes and distortion, only otherwise break away from spirit of the present invention, all should belong to the defined scope of claims of the present invention.
Claims (7)
1. a current transformer device for detecting polarity, comprise direct supply (2) and polarity display circuit, described direct supply (2) connects primary side terminal I (P1) and the primary side terminal II (P2) of a current transformer (1), series connection polarity display circuit between the secondary side terminal I (S1) of current transformer and secondary side terminal II (S2), it is characterized in that: be connected a switching circuit between described DC power anode and negative pole, described commutation circuit comprises a forward conduction switch (31) and a reverse-conducting switch (32), described commutation circuit connects two binding posts and is respectively binding post one (4) and binding post two (5), described forward conduction switch (31) closure, the positive pole of direct supply (2) connects binding post one (4), the negative pole of direct supply (2) connects binding post two (5), described reverse-conducting switch (32) closure, the positive pole of direct supply (2) connects binding post two (5), the negative pole of direct supply (2) connects binding post one (4), described binding post one (4) and binding post two (5) external impressed current mutual inductor (1) primary side terminal I (P1) and primary side terminal II (P2).
2. current transformer device for detecting polarity according to claim 1, it is characterized in that: described forward conduction switch (31) and reverse-conducting switch (32) are double-pole single throw, be respectively double-pole single throw I and double-pole single throw II, it is joint one (K1) that described double-pole single throw I has four auxiliary joints, joint two (K2), joint three (K3) and joint four (K4), described joint one (K1) connects direct supply (2) positive pole, joint two (K2) connects binding post one (4), described joint three (K3) connects direct supply (2) negative pole, joint four (K4) connects binding post two (5), four auxiliary joints of described double-pole single throw II are joint five (K5), joint six (K6), joint seven (K7) and joint eight (K8), described joint five (K5) connects direct supply (2) negative pole, described joint six (K6) connects binding post one (4), described joint seven (K7) connects DC power anode, described joint eight (K8) connects binding post two (5), primary side terminal I (P1) and the primary side terminal II (P2) of described binding post one (4) and binding post two (5) external impressed current mutual inductors (1).
3. current transformer device for detecting polarity according to claim 2, it is characterized in that: described polarity display circuit input end connects two binding posts, be respectively binding post three (6) and binding post four (7), described polarity display circuit comprises two LED light, be respectively forward LED light (LED1) and reverse LED light (LED2), anodal and reverse LED light (LED2) negative pole of described forward LED light (LED1) is connected, tie point is connected in binding post three (6), described forward LED light (LED1) negative pole and the oppositely anodal series connection of LED light (LED2), tie point is connected in binding post four (7), secondary side terminal I (S1) and the secondary side terminal II (S2) of described binding post three (6) and binding post four (7) external impressed current mutual inductors (1).
4. current transformer device for detecting polarity according to claim 3, it is characterized in that: also be provided with a pointer multimeter (33), described pointer multimeter (33) has two terminals, terminals connect the tie point of described forward LED light (LED1) negative pole and the anodal series connection of reverse LED light (LED2), and another terminals are connected in binding post four (7).
5. current transformer device for detecting polarity according to claim 4, it is characterized in that: comprise a housing, described housing is provided with a panel, and described forward conduction switch (31), reverse-conducting switch (32), binding post one (4), binding post two (5), binding post three (6), binding post four (7), forward LED light (LED1), reverse LED light (LED2) and pointer multimeter (33) all are arranged on described panel.
6. current transformer device for detecting polarity according to claim 5, it is characterized in that: described direct supply (2) is dry cell.
7. current transformer device for detecting polarity according to claim 6, it is characterized in that: described housing is provided with a battery case, and described dry cell is arranged in described battery case.
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| CN201310373424.8A CN103472357B (en) | 2013-08-23 | 2013-08-23 | A kind of current transformer device for detecting polarity |
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| CN201310373424.8A CN103472357B (en) | 2013-08-23 | 2013-08-23 | A kind of current transformer device for detecting polarity |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459451A (en) * | 2014-11-26 | 2015-03-25 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN105044547A (en) * | 2015-07-31 | 2015-11-11 | 国网山东沂源县供电公司 | Current transformer polarity tester |
| 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 |
| CN107505585A (en) * | 2017-08-29 | 2017-12-22 | 国家电网公司 | A kind of device for supply line's threephase current transformer secondary circuit Check up polarity |
| CN107677929A (en) * | 2017-07-14 | 2018-02-09 | 国网浙江省电力公司嘉兴供电公司 | A kind of mutual inductor polarity test system |
| CN108646133A (en) * | 2016-01-18 | 2018-10-12 | 辛兴华 | A kind of production method of current transformer Check up polarity termination |
| CN115436860A (en) * | 2022-11-03 | 2022-12-06 | 深钛智能科技(苏州)有限公司 | A heavy current polarity reversal system for new energy automobile |
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| CN202141775U (en) * | 2011-06-07 | 2012-02-08 | 天津二十冶建设有限公司 | Instrument for testing polarity of current transformer |
| CN203376435U (en) * | 2013-08-23 | 2014-01-01 | 国家电网公司 | Polarity detection device of current transformer |
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| JP2009236662A (en) * | 2008-03-27 | 2009-10-15 | Takaoka Electric Mfg Co Ltd | Method of testing transformer for gauge |
| CN201247302Y (en) * | 2008-08-18 | 2009-05-27 | 天津市电力公司 | Apparatus for measuring polar of isonym end of current mutual inductor or transformer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459451A (en) * | 2014-11-26 | 2015-03-25 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN104459451B (en) * | 2014-11-26 | 2017-05-10 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN105044547A (en) * | 2015-07-31 | 2015-11-11 | 国网山东沂源县供电公司 | Current transformer polarity tester |
| CN108646133A (en) * | 2016-01-18 | 2018-10-12 | 辛兴华 | A kind of production method of current transformer Check up polarity termination |
| 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 |
| CN107677929A (en) * | 2017-07-14 | 2018-02-09 | 国网浙江省电力公司嘉兴供电公司 | A kind of mutual inductor polarity test system |
| CN107505585A (en) * | 2017-08-29 | 2017-12-22 | 国家电网公司 | A kind of device for supply line's threephase current transformer secondary circuit Check up polarity |
| CN107505585B (en) * | 2017-08-29 | 2024-02-06 | 国家电网公司 | Device for detecting polarity of secondary loop of three-phase current transformer of power supply line |
| CN115436860A (en) * | 2022-11-03 | 2022-12-06 | 深钛智能科技(苏州)有限公司 | A heavy current polarity reversal system for new energy automobile |
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| CN103472357B (en) | 2016-03-23 |
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