CN103472357B - A kind of current transformer device for detecting polarity - Google Patents
A kind of current transformer device for detecting polarity Download PDFInfo
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- CN103472357B CN103472357B CN201310373424.8A CN201310373424A CN103472357B CN 103472357 B CN103472357 B CN 103472357B CN 201310373424 A CN201310373424 A CN 201310373424A CN 103472357 B CN103472357 B CN 103472357B
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Abstract
The invention discloses a kind of current transformer device for detecting polarity, comprise direct supply and polarity display circuit, described direct supply is connected to primary side terminal I and the primary side terminal II of a current transformer, polarity of connecting between secondary side terminal I and secondary side terminal II display circuit, a commutation circuit is connected 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, forward switch closes, the positive pole of direct supply connects binding post one, negative pole connects binding post two, reverser closes, then the polarity of direct supply access binding post one and binding post two is exchanged.The primary side terminal I of binding post one and binding post two external impressed current mutual inductor and primary side terminal II.The present invention directly exchanges two primary side terminal polarity of direct supply access current transformer by commutation circuit, and easy to use, 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
When current transformer is done to measure and used, for metering in electric system and the electric current measuring operational outfit; Do to coordinate with the protective relaying device in electric system when protection uses, be short-circuited in electric system, the fault such as overload time provide shutoff signal to protective relaying device, protect the safety of electric power system.Misdeeming to misunderstand in current transformer polarity causes the phase place of Current Transformer Secondary side that 180 ° of changes occur, and sends contrary signal to protective relaying device, causes the misoperation of protective relaying device.At present, when the detection of current transformer polarity mainly utilizes battery to access current transformer primary side terminal, the deflection of the current break pointer multimeter that causes secondary side terminal to connect is done to judge.The positive pole of the deflection side corresponding current mutual inductor secondary side terminal current of described pointer multimeter pointer, but the secondary side winding resistance of different current transformers is different, and the deflection amplitude of pointer multimeter is different, is unfavorable for observation.Therefore have the open application number of China be 201220201328.6 patent propose a kind of instrument for testing polarity of current transformer, mainly through signal place in circuit, electric current forward conduction circuit and electric current reverse-conducting circuit are distinguished, then the direction of current signal is judged by signal processing circuit, thus judge the polarity of current transformer, but electron device that circuit connects is more in this patent, circuit is comparatively complicated.What is more important, because the test of current transformer Check up polarity needs the polarity of the battery repeatedly exchanging access current transformer to carry out the correctness of demonstration test usually, but this patent not mentioned mode of just repeatedly exchanging the polarity of battery access current transformer primary side terminal, the dismounting trouble when manually exchanging and easily makeing 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, and directly exchanged the polarity of direct supply access current transformer primary side by forward conduction switch and reverse-conducting switching over, 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, to connect between the secondary side terminal I of current transformer and secondary side terminal II polarity display circuit, a commutation circuit is connected 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 closes, the positive pole of direct supply connects binding post one, the negative pole of direct supply connects binding post two, described reverse-conducting switch closes, 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 corresponds to primary side terminal I, and secondary side terminal II corresponds to primary side terminal II.When the primary side terminal of current transformer is connected correct with secondary side terminal, if forward conduction switch closes, the positive pole of direct supply connects binding post one, DC power cathode connects binding post two, forward circuit conducting, polarity display circuit display circuit forward conduction, and the polarity of now Current Transformer Secondary side terminal can be judged; If reverse-conducting switch closes, DC power anode connects binding post two, and DC power cathode connects binding post one, negater circuit conducting, polarity display circuit display circuit reverse-conducting, and can judge the polarity of now Current Transformer Secondary side terminal.The polarity of current transformer primary side is accessed without the need to manual dismounting direct supply and interchangeable direct supply, 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, described double-pole single throw I has four auxiliary joints to be joint one, 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, the primary side terminal I of described binding post one and binding post two external impressed current mutual inductor and primary side terminal II.Double-pole single throw wiring is simple, and circuit be divide into 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, described forward LED light positive pole and the series connection of reverse LED light negative pole, tie point is connected to binding post three, described forward LED light negative pole and the series connection of reverse LED light positive pole, tie point is connected to binding post four, the secondary side terminal I of described binding post three and the external current transformer of binding post four and secondary side terminal II.Mistake at the primary side terminal of current transformer and secondary side connecting terminals wrong, circuit cannot conducting, and whether polarity display circuit or not situation, and now user makes circuit turn-on by the position exchanging Current Transformer Secondary side terminal.When the primary side terminal of current transformer is connected correct with secondary side terminal, if electric current forward conduction, forward LED light lights, if electric current reverse-conducting, reverse LED light lights, being that forward LED light lights or oppositely LED light lights the polarity judging now Current Transformer Secondary side terminal I and secondary side terminal II, intuitive display by observing, not easily causing misjudgment.If forward LED light and reverse LED light all do not light, then show the non-conducting of circuit, Current Transformer Secondary side terminal connection error, need exchange the position of Current Transformer Secondary side terminal and binding post three and binding post four.
As preferably, be also 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 series connection of reverse LED light positive pole, and another terminals are connected to binding post four.After switch, forward LED light and reverse LED light light according to current direction conducting, and the deflection of respective direction also occurs pointer multimeter simultaneously.If LED light during circuit turn-on in respective branch does not light, namely the polarity of the secondary side terminal of current transformer is judged by the deflection of pointer multimeter, pointer multimeter also can be used as an assistant display device, be convenient to check the situation of LED light display, ensure the accuracy that current transformer polarity judges.
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, oppositely LED light and pointer multimeter are all arranged on described panel.The connection circuit of described current transformer device for detecting polarity is all 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, oppositely LED light and pointer multimeter are all 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 not take out by the used time, 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, tool of the present invention has the following advantages:
Closed by the switching of forward conduction switch and reverse-conducting switch, directly can exchange the polarity of the primary side terminal of direct supply access current transformer, without the need to the dismounting 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 circuit forward and reverse-conducting, intuitive display respectively, are 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, and the secondary side terminal connection error of current transformer is described, need exchange and the position of secondary side terminal connection.
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;
The circuit interconnect pattern of Fig. 2 to be polarity display circuit be LED light;
The circuit interconnect pattern of Fig. 3 to be polarity display circuit be 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 IP1 and the primary side terminal II P2 of a current transformer 1, to connect between the secondary side terminal IS1 of current transformer and secondary side terminal II S2 polarity display circuit, described DC power anode be connected a commutation circuit between negative pole, described commutation circuit comprises 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 closes, 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 closes, 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 IP1 of described binding post 1 and binding post 25 external impressed current mutual inductor 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.Circuit is divided into forward conduction and reverse-conducting two parts by described double-pole single throw I and double-pole single throw II, not easily occurs the problem of misconnection.Described double-pole single throw I has four auxiliary joints to be joint one K1, 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 1, described joint three K3 connects direct supply 2 negative pole, joint four K4 connects 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 connects direct supply 2 negative pole, described joint six K6 connects binding post 1, described joint seven K7 connects DC power anode, described joint eight K8 connects binding post 25, the primary side terminal IP1 of described binding post 1 and binding post 25 external impressed current mutual inductor 1 and primary side terminal II P2.The secondary side terminal IS1 of described current transformer corresponds to primary side terminal IP1, secondary side terminal II S2 and corresponds to primary side terminal II P2.Assuming that the primary side terminal IP1 of current transformer 1 connects binding post 1, the then correct mode of connection should be that primary side terminal II P2 connects binding post 25, the secondary side terminal IS1 of described current transformer connects binding post 36, and secondary side terminal II S2 connects binding post 47.If when the primary side terminal of current transformer is connected correct with secondary side terminal, double-pole single throw I closes, the positive pole of direct supply connects binding post 1, DC power cathode connects binding post 25, forward circuit conducting, polarity display circuit display circuit forward conduction, and can judge that now Current Transformer Secondary side terminal IS1 is positive pole, Current Transformer Secondary side terminal IIS2 is negative pole; If double-pole single throw II closes, DC power anode connects binding post 25, DC power cathode connects binding post 1, negater circuit conducting, polarity display circuit display circuit reverse-conducting, and can judge that now Current Transformer Secondary side terminal IS1 is negative pole, Current Transformer Secondary side terminal IIS2 is positive pole.The polarity of current transformer primary side is accessed without the need to manual dismounting direct supply 2 i.e. interchangeable direct supply 2, easy to use.As preferably, described direct supply 2 is dry cell, carries with easy for installation.
See 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 negative pole series connection of reverse LED light LED2, tie point is connected to binding post 36, the negative pole of described forward LED light LED1 and the positive pole series connection of reverse LED light LED2, tie point is connected to binding post 47, the secondary side terminal IS1 of described binding post 36 and binding post 47 external impressed current mutual inductor 1 and secondary side terminal II S2.If current transformer 1 secondary side terminal connects not corresponding with primary side terminal, such as in foregoing example, if secondary side terminal IS1 connects binding post 47 when the primary side terminal of current transformer connects constant, when secondary side terminal II S2 connects binding post 36, circuit cannot conducting.Use two LED light, when forward LED light LED1 and reverse LED light LED2 does not all light, show the non-conducting of circuit, i.e. Current Transformer Secondary side terminal connection error, can remind user to exchange the secondary side terminal IS1 of current transformer and the position of secondary side terminal II S2 and binding post 36 and binding post 47.When the terminal of the primary side of current transformer is connected correct with the terminal of secondary side, if electric current forward conduction, forward LED light LED1 lights, if electric current reverse-conducting, reverse LED light lights LED2 and lights, being that forward LED light LED1 lights or oppositely LED light LED2 lights the polarity judging now Current Transformer Secondary side terminal I and secondary side terminal II, intuitive display by observing, not easily causing misjudgment.
At Fig. 2 polarity display circuit be LED light basis on also can connect a pointer multimeter 33 again, can see 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 series connection of reverse LED light LED2 positive pole, and another terminals are connected to binding post 47.After switch, forward LED light LED1 and reverse LED light LED2 lights according to current direction conducting, and the deflection of respective direction also occurs pointer multimeter 33 simultaneously.If LED light does not but light in respective branch during circuit turn-on, namely judge the polarity of the secondary side terminal of current transformer by the deflection of pointer multimeter 33.The direction of the deflection of described pointer multimeter 33 pointer is electric current forward.Under forward LED light LED1 and reverse LED light LED2 indicates all normal situation, described pointer multimeter 33 also can be used as an assistant display device, be convenient to check the situation of LED light display, ensure the accuracy that current transformer polarity judges.
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.See 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, oppositely LED light LED2 and pointer multimeter 33 are all arranged on described panel.In this preferred embodiment, described forward conduction switch 31 and reverse-conducting switch 32 have red and green mark respectively on panel, corresponding forward LED light LED1 and reverse LED light LED2 is also respectively red LED light and green LED light, display is consistent, not easily causes polarity misjudgment.Each function of current transformer device for detecting polarity is concentrated on panel, the observation of convenient operation and LED light state.Also be provided with a battery case on the housing, described dry cell is arranged in described battery case.Dry cell can not take out by the used time, 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 various change and distortion according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope that claims of the present invention define.
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), to connect between the secondary side terminal I (S1) of current transformer and secondary side terminal II (S2) polarity display circuit, it is characterized in that: described DC power anode be connected a commutation circuit between negative pole, direct supply (2) realizes the primary side terminal I (P1) of direct supply (2) with current transformer (1) and described connection of primary side terminal II (P2) by described commutation circuit, 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) closes, 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) closes, 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, described double-pole single throw I has four auxiliary joints to be joint one (K1), 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), the primary side terminal I (P1) of described binding post one (4) and binding post two (5) external impressed current mutual inductor (1) and primary side terminal II (P2).
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), described forward LED light (LED1) positive pole and the series connection of reverse LED light (LED2) negative pole, tie point is connected to binding post three (6), described forward LED light (LED1) negative pole and the series connection of reverse LED light (LED2) positive pole, tie point is connected to binding post four (7), the secondary side terminal I (S1) of described binding post three (6) and binding post four (7) external impressed current mutual inductor (1) and secondary side terminal II (S2).
4. current transformer device for detecting polarity according to claim 3, it is characterized in that: be also 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 series connection of reverse LED light (LED2) positive pole, another terminals are connected to binding post four (7), described binding post four (7) realizes being connected with the described of tie point that forward LED light (LED1) negative pole and reverse LED light (LED2) positive pole are connected by described pointer multimeter (33).
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), oppositely LED light (LED2) and pointer multimeter (33) are all arranged on described panel.
6. current transformer device for detecting polarity according to claim 5, 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, described dry cell is arranged in described battery case.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103472357B true CN103472357B (en) | 2016-03-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108646133B (en) * | 2016-01-18 | 2020-05-12 | 刘晓冰 | Manufacturing method of wiring device for detecting polarity of current transformer |
| 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 |
| CN107677929B (en) * | 2017-07-14 | 2020-03-24 | 国网浙江省电力公司嘉兴供电公司 | Mutual inductor polarity test system |
| 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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| 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5396731B2 (en) * | 2008-03-27 | 2014-01-22 | 株式会社高岳製作所 | Test method for instrument transformer |
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|---|---|---|---|---|
| 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 |
| CN201576068U (en) * | 2009-11-18 | 2010-09-08 | 中国西电电气股份有限公司 | Test circuit for inspecting polarities of transformer |
| 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 |
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