CN203572862U - Current isolation transformer - Google Patents
Current isolation transformer Download PDFInfo
- Publication number
- CN203572862U CN203572862U CN201320760424.9U CN201320760424U CN203572862U CN 203572862 U CN203572862 U CN 203572862U CN 201320760424 U CN201320760424 U CN 201320760424U CN 203572862 U CN203572862 U CN 203572862U
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- mutual inductor
- circuit
- winding
- isolation transformer
- electric current
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- 238000002955 isolation Methods 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 229910000889 permalloy Inorganic materials 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 235000007340 Hordeum vulgare Nutrition 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 240000005979 Hordeum vulgare Species 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 6
- 238000012795 verification Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 241000209219 Hordeum Species 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002964 excitative effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model discloses a current isolation transformer. The current isolation transformer includes: a transformer shell used for avoiding external signal interference, a permalloy iron core I, a permalloy iron core II, windings (W1, W2, W3, W4 and W5) of the permalloy iron cores, and an electronic compensation circuit for compensating a magnetic potential. The permalloy iron cores, the windings thereof and the electronic compensation circuit are arranged in the transformer shell. The electronic compensation circuit includes: a power module, an operational amplifier circuit, an open circuit detection circuit and an alarm circuit. The beneficial effects of utility model are that: the current isolation transformer can complete the examination of the three-phase direct access electricity meter when the three-phase assembly line and three-phase equal-potential checking device do not disconnect or cannot disconnect; the overall current isolation transformer structure is simple, concise, and beautiful; and the incoming and outgoing line is standard; and the current input and output wiring method is simple, reliable, and easy to use.
Description
Technical field
The utility model relates to list, three-phase electric energy meter streamline automatic calibration system field, relates in particular to a kind of electric current isolation transformer.
Background technology
In order to guarantee power system security economical operation, must carry out monitoring and measuring to the ruuning situation of power equipment, but general measurement and protective device can not directly access high-tension apparatus No. one time, and the large electric current scaling transformation of primary system need to be become to little electric current, supplying with measurement instrument and protective device uses, this will use current transformer, current transformer plays a part unsteady flow and electrical isolation, it is measurement instrument in electric system, the secondary devices such as relay protection obtain the sensor of electric primary circuit current information, current transformer converts high electric current to low current in proportion, current transformer primary side is connected on primary system, secondary side joint measurement instrument, relay protection etc.
Traditional mutual inductor volume is large, weight is large, cost is high, if used on electric energy meter calibration streamline, higher to the requirement meeting of mutual inductor.At present, three-phase flow waterline cannot carry out the unhook of electric current and voltage at verification direct access Biao Shiyin, and (three-phase direct access table is prepared to release by Guo Wang company does not have external voltage brace, cannot break off relations), therefore must use isolation CT to carry out verification, the current state of the art is that isolation CT is unreasonable aspect leading-out wire structure, causes mutual inductor inconvenient especially and affect attractive in appearance while installing on device.
Utility model content
The purpose of this utility model is exactly in order to address the above problem, a kind of electric current isolation transformer device has been proposed, this device has been adjusted installation, the mode of connection of existing mutual inductor, in the process of calibration, do not re-use the front unhook of original verification, this link of verification aft hook, the verifying work efficiency of direct access electric energy meter is improved significantly, the structural design novelty of this mutual inductor, easy for installation, outward appearance is clean and tidy, and efficiency is high.
To achieve these goals, the utility model adopts following technical scheme:
A kind of electric current isolation transformer, comprising: for the mutual inductor housing of avoiding external signal to disturb, and permalloy I unshakable in one's determination, permalloy II unshakable in one's determination and winding W1, W2, W3, W4 and W5, and for compensating the electronic compensation circuit of magnetic potential; Permalloy iron core and winding thereof and electronic compensation circuit are arranged in mutual inductor housing, and the two ends of described electronic compensation circuit connect respectively winding W4 and winding W5; Electronic compensation circuit comprises: the voltage transitions that Switching Power Supply is provided becomes normally the work power module of required voltage of operational amplifier, for generation of the operational amplification circuit of offset current, for preventing Current Transformer Secondary side the be in operation open detection circuit of open circuit and the warning circuit while electronic compensation circuit compensation results abnormity being detected; Described power module is connected respectively with operational amplification circuit and warning circuit, and operational amplification circuit is connected with warning circuit, and open detection circuit connects mutual inductor secondary side winding.
Described mutual inductor housing is rectangular parallelepiped shell, and housing outer surface is provided with louvre, rectangle handle, current input terminal, current output terminal, mutual inductor compensating plate input and output terminal.
Before and after described mutual inductor housing, outside surface respectively has two row's louvres, and before and after mutual inductor housing, outside surface respectively has invaginating rectangle handle.
Described mutual inductor outside is provided with the connection terminal of inside and outside communication, and connection terminal is plugging member, adopts copper binding post and is screwed.
Between described mutual inductor and mutual inductor, all adopt highland barley paper washer liner between mutual inductor and mutual inductor housing, top mutual inductor and below mutual inductor adopt central dividing plate isolation.
Electronic compensation circuit board is installed in described central dividing plate top, and central dividing plate below is installed and is used to mutual inductor compensating plate open detection circuit that the rectifier bridge of direct current signal is provided.
Described iron core I, II unshakable in one's determination and primary and secondary winding W1, W2 form basic mutual inductor; The detection winding W5 of electronic compensation circuit is in I unshakable in one's determination; Compensation winding W4 is on II unshakable in one's determination.
The independent output winding that another no-load voltage ratio of described winding W1 and winding W3 composition mutual inductor is 3:1.
Electronic compensation circuit is comprised of power module, operational amplification circuit, open detection circuit and warning circuit.Play the effect of compensation magnetic potential.
Power module: power module is mainly that the voltage that Switching Power Supply is provided becomes the required voltage of the normal work of operational amplifier by processing of circuit such as rectification, filtering, voltage stabilizings.
Operational amplification circuit: operational amplification circuit is mainly that the electromotive force that coil W5 is checked through produces offset current I4 at W4 after the processing of amplifying circuit, plays the effect of compensation magnetic potential.
Open detection circuit: Current Transformer Secondary side is in operation and does not allow open circuit; therefore in Current Transformer Secondary side, increased open detection circuit; during Current Transformer Secondary open circuit, electric current flows through through rectification circuit; now magnetic test coil sample rate current signal sends external control circuit after treatment to; external control circuit transmits control signal and controls secondary circuit protective relay short circuit, and assurance Current Transformer Secondary side can not be opened a way.
Warning circuit: when electronic compensation circuit compensation results abnormity being detected, warning circuit is transferred to warning device by the abnormal signal collecting.
The beneficial effects of the utility model are:
1. the utility model can complete the check of the three-phase direct access ammeter that three-phase flow waterline and three equal potentials do not break off relations or cannot break off relations compared with calibration equipment verification, one-piece construction is simple, generous, attractive in appearance, line standard, the electric current input and output mode of connection is succinct, reliable, easy to use.
2. changed the mode of estimated current mutual inductor primary side extension line and the processing mode of the large electric current line of coiling above estimated current transformer core, also changed the installation site of current transformer compensating plate and secondary side short circuit relay and rectifier bridge, standard first and second electric current extension line mounting means, facilitate on-the-spot installation distribution, improved processing, inspection and the mounting process of mutual inductor.
Standard mutual inductor second open circuit adopt the alerting signal way of output, when current transformer runs into abnormal conditions, can and alarm, remind staff to take measures.Meanwhile, multifunction board and voltage relay plate merge use and have dwindled overall volume, are easy to carry, and circuit board installation guide groove facilitates the cabling mode of line.
4. the utility model is the tandem product of the standard in electric current isolation transformer, outward appearance is neatly beautiful, precision is high, volume is little, power is large, with holding circuit, the high energy of power, reach 45VA, shell adopts metal shell, the magnetic field that isolation CT can be produced shields to greatest extent in isolation CT inside, has changed layout and the mounting means design of pcb board; Improve printed board installation rate; Improve the integrated artistic after distribution.
Accompanying drawing explanation
Fig. 1 is the utility model mutual inductor outside structural representation;
Fig. 2 is the utility model mutual inductor case side composition that hardens;
Fig. 3 is the cut-open view of the utility model mutual inductor housing interface;
Fig. 4 is the utility model mutual inductor housing Wiring port structural drawing;
Fig. 5 is the utility model mutual inductor housing cut-open view;
Fig. 6 is the utility model transformer iron core and winding construction schematic diagram;
Fig. 7 is the utility model electronic compensation board structure of circuit schematic diagram.
Wherein, 1. mutual inductor housing, 2. mutual inductor compensating plate lead-out terminal, 3. the sub-Ia of current output terminal, 4. the sub-Iao of current input terminal, 5. the sub-Ib of current output terminal, 6. the sub-Ibo of current input terminal, 7. the sub-Ico of current output terminal, 8. the sub-Ico of current input terminal, 9. louvre, 10. rectangle handle, 12. mutual inductor case top lid, 14. mutual inductor housing side plates, 15. plugging members, 16.M4X12 cross recessed countersunk head sscrew, 17. bronze medal binding posts, 18. mutual inductors, 19. rectifier bridges, 20. electronic compensation circuit boards, 21. central dividing plates, 22. highland barley paper washers, 23. power modules, 24. operational amplification circuits, 25. warning circuits, 26. open detection circuit.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
A kind of electric current isolation transformer, comprising: for the mutual inductor housing 1 of avoiding external signal to disturb, and permalloy I unshakable in one's determination, permalloy II unshakable in one's determination and winding W1, W2, W3, W4 and W5, and for compensating the electronic compensation circuit board 20 of magnetic potential; Permalloy iron core and winding thereof and electronic compensation circuit board 20 are arranged in mutual inductor housing 1.
As shown in Figure 1, Figure 2 and Figure 3, mutual inductor housing 1, for the design of rectangular parallelepiped shell, is also printed on silk-screen on housing side plate, and silk-screen is utility model title, and mutual inductor housing 1 is circumferential closed casing.Housing outer surface is provided with louvre 9, rectangle handle 10, current input terminal, current output terminal, compensating plate input, lead-out terminal.The each mutual inductor housing of housing front-back side plate 14 has two row's louvres 9, for mutual inductor inside and external ventilation, plays heat radiation and extends the mutual inductor effect in serviceable life.The each mutual inductor housing of housing front-back side plate 14 has invaginating rectangle handle 10, guides and supports conveniently.
Wherein the sub-Iao4 of current input terminal, the sub-Ibo6 of current input terminal, the sub-Ico8 of current input terminal be mainly mutual inductor coil successively winding 100A electric current is provided.The sub-Ia3 of current output terminal, the sub-Ib5 of current output terminal, the sub-Ic7 of current output terminal are mainly the electric current output gauge stands that the electric current of a winding is sensed by 1:1 no-load voltage ratio.Mutual inductor compensating plate lead-out terminal 2 is mainly that the 100A electric current of a winding is exported by 3:1 no-load voltage ratio.Mutual inductor compensating plate lead-out terminal 2 comprises ground terminal GND, voltage ± 50V terminal, alarm signal output ends, relay connection signal terminal, relay cut-off signal terminal, open circuit detection signal.
GND, ± 50V in lead-out terminal is mainly the operating voltage for mutual inductor electronic compensation circuit board 20 provide ± 50V; Mutual inductor electronic compensation circuit board 20 is mainly for warning device provides alerting signal when accident appears in electronic compensation circuit, by the output of alarm signal output ends, the output of alarm signal output ends has A phase alarm signal output ends, B phase alarm signal output ends, C phase alarm signal output ends.
When coil detects current transformer 18 secondary side open circuit, by open circuit, detect lead-out terminal detection signal is exported to external control circuit, external control circuit is processed the detection signal receiving, and then output signal is delivered to mutual inductor electronic compensation circuit board 20 through Interface Terminal.
As shown in Figure 4 and Figure 5, mutual inductor housing 1 outer setting has the connection terminal of inside and outside communication, and connection terminal is plugging member 15, the copper binding post 17 of employing, and binding post adopts M4X12 cross recessed countersunk head sscrew 16 fixing.
In mutual inductor housing 1 inner structure, mutual inductor 18 is arranged at bottom, adopts highland barley paper washer 22 liners between mutual inductor and mutual inductor and between mutual inductor and housing, avoids mutual inductor to be worn, to collide.Mutual inductor 18 tops adopt central dividing plate 21 and the mutual inductor 18 of below to isolate.
Electronic compensation circuit board 20 is installed on central dividing plate 21 tops, rectifier bridge 19 is installed on central dividing plate 21 belows, dividing plate top is sealed by mutual inductor case top lid 12, central dividing plate 21 is provided with rectifier bridge 19, and rectifier bridge 19 provides direct current signal for the open detection circuit of mutual inductor electronic compensation circuit board plate 20.
As shown in Figure 6, mutual inductor 18 adopts two permalloys unshakable in one's determination, and coil winding as shown above, I unshakable in one's determination and primary and secondary winding form basic mutual inductor, after compensation, in the ideal case, the exciting flux of I unshakable in one's determination should be zero, but in fact always relict flux Φ a little, detect winding W5 also upper around I unshakable in one's determination, under relict flux Φ, produce sense potential E5, E5 is very little, after electronic compensation circuit amplifies, produces offset current I4 on W4; II unshakable in one's determination and primary and secondary winding W1, W2 form another mutual inductor, compensation winding W4 is also upper around II unshakable in one's determination, and I4 produces compensation magnetic potential I4*W4, if the excitatory magnetic potential in I4*W4 energy full remuneration iron core, I unshakable in one's determination just can form zero magnetic flux mutual inductor, is desirable mutual inductor.The independent output winding that winding W1 and another no-load voltage ratio of W3 composition mutual inductor are 3:1.Mainly play and increase the precision of mutual inductor when little electric current and the effect of load capacity, during the electric energy meter accessing through sensor in verification, can greatly improve a milliampere measuring accuracy for level electric current pilot.
As shown in Figure 7, described electronic compensation circuit board 20 comprises: the voltage transitions that Switching Power Supply is provided becomes normally the work power module 23 of required voltage of operational amplifier, for generation of the operational amplification circuit 24 of offset current, for preventing Current Transformer Secondary side the be in operation open detection circuit 26 of open circuit and the warning circuit 25 while electronic compensation circuit compensation results abnormity being detected, power module 23 is connected respectively with operational amplification circuit 24 and warning circuit 25, operational amplification circuit 24 is connected with warning circuit 25, open detection circuit 26 connects mutual inductor secondary side winding.
Although above-mentioned, by reference to the accompanying drawings embodiment of the present utility model is described; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (8)
1. an electric current isolation transformer, is characterized in that, comprising: for the mutual inductor housing of avoiding external signal to disturb, and permalloy I unshakable in one's determination, permalloy II unshakable in one's determination and winding W1, W2, W3, W4 and W5, and for compensating the electronic compensation circuit of magnetic potential; Permalloy iron core and winding thereof and electronic compensation circuit are arranged in mutual inductor housing, and the two ends of described electronic compensation circuit connect respectively winding W4 and winding W5; Electronic compensation circuit comprises: the voltage transitions that Switching Power Supply is provided becomes normally the work power module of required voltage of operational amplifier, for generation of the operational amplification circuit of offset current, for preventing Current Transformer Secondary side the be in operation open detection circuit of open circuit and the warning circuit while electronic compensation circuit compensation results abnormity being detected; Described power module is connected respectively with operational amplification circuit and warning circuit, and operational amplification circuit is connected with warning circuit, and open detection circuit connects mutual inductor secondary side winding.
2. a kind of electric current isolation transformer as claimed in claim 1, it is characterized in that, described mutual inductor housing is rectangular parallelepiped shell, and housing outer surface is provided with louvre, rectangle handle, current input terminal, current output terminal, mutual inductor compensating plate input and output terminal.
3. a kind of electric current isolation transformer as claimed in claim 2, is characterized in that, before and after described mutual inductor housing, outside surface respectively has two row's louvres, and before and after mutual inductor housing, outside surface respectively has invaginating rectangle handle.
4. a kind of electric current isolation transformer as claimed in claim 1, is characterized in that, described mutual inductor outside is provided with the connection terminal of inside and outside communication, and connection terminal is plugging member, adopts copper binding post and is screwed.
5. a kind of electric current isolation transformer as claimed in claim 1, is characterized in that, between described mutual inductor and mutual inductor, all adopt highland barley paper washer liner between mutual inductor and mutual inductor housing, top mutual inductor and below mutual inductor adopt central dividing plate isolation.
6. a kind of electric current isolation transformer as claimed in claim 5, is characterized in that, electronic compensation circuit board is installed in described central dividing plate top, and central dividing plate below is installed and is used to mutual inductor compensating plate open detection circuit that the rectifier bridge of direct current signal is provided.
7. a kind of electric current isolation transformer as claimed in claim 1, is characterized in that, described iron core I, II unshakable in one's determination and primary and secondary winding W1, W2 form basic mutual inductor; The detection winding W5 of electronic compensation circuit is in I unshakable in one's determination; Compensation winding W4 is on II unshakable in one's determination.
8. a kind of electric current isolation transformer as claimed in claim 1, is characterized in that, the independent output winding that another no-load voltage ratio of described winding W1 and winding W3 composition mutual inductor is 3:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760424.9U CN203572862U (en) | 2013-11-26 | 2013-11-26 | Current isolation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760424.9U CN203572862U (en) | 2013-11-26 | 2013-11-26 | Current isolation transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203572862U true CN203572862U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320760424.9U Expired - Lifetime CN203572862U (en) | 2013-11-26 | 2013-11-26 | Current isolation transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203572862U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592491A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Current isolation mutual inductor |
| CN107703345A (en) * | 2017-11-08 | 2018-02-16 | 合肥东胜汽车电子有限公司 | A kind of new full-bridge transformer is galvanically isolated detection circuit |
| CN111878068A (en) * | 2020-05-11 | 2020-11-03 | 中国科学院地质与地球物理研究所 | High-temperature solid-state resonance gyroscope and drilling measurement system composed of same |
-
2013
- 2013-11-26 CN CN201320760424.9U patent/CN203572862U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592491A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Current isolation mutual inductor |
| CN103592491B (en) * | 2013-11-26 | 2017-03-22 | 国家电网公司 | Current isolation mutual inductor |
| CN107703345A (en) * | 2017-11-08 | 2018-02-16 | 合肥东胜汽车电子有限公司 | A kind of new full-bridge transformer is galvanically isolated detection circuit |
| CN111878068A (en) * | 2020-05-11 | 2020-11-03 | 中国科学院地质与地球物理研究所 | High-temperature solid-state resonance gyroscope and drilling measurement system composed of same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: No.1, 2nd Ring South Road, Shizhong District, Jinan City, Shandong Province Patentee before: State Grid Corporation of China Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. |
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| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210413 Address after: No. 150, Jinger Road, Daguanyuan, Shizhong District, Jinan City, Shandong Province Patentee after: Shandong Electric Power Marketing Center Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |