CN105575643A - Three-phase current transformer - Google Patents
Three-phase current transformer Download PDFInfo
- Publication number
- CN105575643A CN105575643A CN201610112285.7A CN201610112285A CN105575643A CN 105575643 A CN105575643 A CN 105575643A CN 201610112285 A CN201610112285 A CN 201610112285A CN 105575643 A CN105575643 A CN 105575643A
- Authority
- CN
- China
- Prior art keywords
- current transformer
- winding
- iron core
- transformer according
- threephase current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/38—Instruments transformers for polyphase ac
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/022—Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
A three-phase current transformer comprises a shell. Three supporting columns are arranged in the shell. Each supporting column is provided with an iron core. Each iron core is wound by a winding. A first insulation layer is arranged between each winding and the corresponding iron core. A second insulation layer is arranged on the outer surface of each iron core wound by the winding. A shielding piece is arranged on the outer side of each second insulation layer. The head ends and the tail ends of the shielding pieces do not make contact directly. Five wiring terminals IN, G, IA, IB and IC are arranged on the shell. The input ends of the windings are connected to the wiring terminal IN. A lead is connected to each shielding piece. The leads are connected to the wiring terminal G. The output ends of the windings are connected with the wiring terminal IA or IB or IC. A resistor is connected between the input end and the output end of each winding. The three-phase current transformer further comprises a pouring sealant for sealing the whole transformer. Wiring of a three-phase watt hour meter is optimized, the space utilization rate is increased, the yield is improved, the universality is good, and the three-phase current transformer is suitable for large-scale production.
Description
Technical field
The present invention relates to electrical equipment, particularly relate to a kind of threephase current transformer.
Background technology
The three-phase four-wire system kilowatt-hour meter pair of connecting wires electrician of electrified current transformer is one needs very rigorous work, often there will be wrong line and causes the problem of the potential safety hazards such as various instrument damage, human injury.Traditional mode of connection is that one of three-phase electricity connects a current transformer monomer, and this mode of connection is not only arranged at random, and wiring is various, can be easy to cause wiring error, and space utilization rate variance, and cost is high.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of threephase current transformer, optimizes the wiring of three-phase electricity kilowatt-hour meter, improves space availability ratio, and reduce finished product, versatility is relatively good, and is suitable for large-scale production.
To achieve these goals, technical scheme of the present invention is:
A kind of threephase current transformer, comprise: housing, three support columns are provided with in described housing, each support column is provided with iron core, described iron core is wound with winding, between described winding and iron core, be provided with the first insulating barrier, the second insulating barrier is provided with at the outer surface of the iron core being wound with winding, the outside of described second insulating barrier is provided with shielding sheet, and the head and the tail two ends of described shielding sheet directly do not contact, and described shell is provided with five binding posts: IN, G, IA, IB and IC; The input of described winding is all connected on binding post IN, and described shielding sheet is connected to lead-in wire, and described lead-in wire is connected on binding post G, and the output of described winding connects binding post IA, IB or IC; Contact resistance between the input of described winding and output; Also comprise the casting glue for closing whole device.
Described support column is hollow cylinder.
Described shielding sheet is copper foil.
Described winding is enamelled wire.
Described lead-in wire is enamelled wire.
Described resistance is multicolored loop resistance.
Described casting glue is fire-retarded epoxy resin.
The curing time of described casting glue is directly proportional to temperature.
Described binding post is contact pin type binding post.
Described core material is ultracrystallite magnetic material.
The invention has the beneficial effects as follows: three-in-one current transformer, output improvement, for sharing an input current port IN, reduces wiring number; Each instrument transformer monomer parallel resistance, is connected the damage of instrument with other to instrument transformer when preventing the open circuit of instrument transformer secondary terminals from working.Electromagnetic interference between coil effectively solves by adding shielding sheet.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of threephase current transformer.
Fig. 2 is the structural representation before a kind of threephase current transformer embedding.
Fig. 3 is the structural representation relative to Fig. 1 front view.
Fig. 4 is the structural representation of shell.
Fig. 5 is the structural representation that coil circulates in inter process order.
Fig. 6 is the structural representation of leading-out terminal.
In figure: 1 housing; 2 binding posts; 3 windings; 4 casting glues; 41 support columns; 51 iron cores; 52 enamelled wires; 53 shielding sheets; 54 lead-in wires; 55 resistance; 61 draw pin.
Embodiment
In order to better understand technical scheme of the present invention, below in conjunction with accompanying drawing, the invention will be further described.
As shown in figures 1 to 6, a kind of threephase current transformer, comprise: housing 1, three support columns 41 are provided with in described housing, each support column is provided with iron core 51, described iron core is wound with winding 3, the first insulating barrier is provided with between described winding and iron core, the second insulating barrier is provided with at the outer surface of the iron core being wound with winding, the outside of described second insulating barrier is provided with shielding sheet 53, the head and the tail two ends of described shielding sheet directly do not contact, and described shell is provided with five binding posts 2:IN, G, IA, IB and IC; The input of described winding is all connected on binding post IN, and described shielding sheet is connected to lead-in wire 54, and described lead-in wire is connected on binding post G, and the output of described winding connects binding post IA, IB or IC; Contact resistance 55 between the input of described winding and output; Also comprise the casting glue 4 for closing whole device.
Described support column is hollow cylinder.
Described shielding sheet is copper foil.
Described winding is enamelled wire.
Described lead-in wire is enamelled wire.
Described resistance is multicolored loop resistance.
Described casting glue is fire-retarded epoxy resin.
The curing time of described casting glue is directly proportional to temperature.
Described binding post is contact pin type binding post.
Described core material is ultracrystallite magnetic material.
Concrete welding process of the present invention is as follows: with regard to a winding, according to Fig. 5, a winding 3 is done to the process of illustrated sequencing.Concrete, first at the additional insulating barrier of iron core 51, stop iron core 51 and directly contact with coiling enamelled wire 52 thereon.Then the good enamelled wire 52 of coiling, then add a layer insulating.Here insulating barrier selects the coated enamelled wire of polyester film, can well reduce costs; Insulating barrier outside iron core 51 then selects the insulation crust of customization, easy to use, increases work efficiency.Next be add shielding sheet 53 to winding 3 to process, shielding sheet 53 here needs to carry out the independent work for the treatment of of a step.The copper foil that one width is consistent with iron core height is paved, and weld one section of lead-in wire 54 in its one end, it welds with the shared grounding port G of leading-out terminal.Shielding sheet 53 with one section of lead-in wire 54 is coated on the side of winding 3, the head and the tail requirement of copper foil can not contact, and prevents the formation of eddy current.Then at an outside coated polyester film again of shielding sheet 53, the direct contact between coil 3 is prevented.Between winding the end of a thread, a resistance in parallel, is welded on enamelled wire.The type selecting of resistance selects multicolored loop resistance.
The explanation of the following welding rules between the end of a thread and leading-out terminal that exactly three enamelled wires on a coil 3 gone between.Two lead-in wire the end of a thread on winding are respectively input current end IN and output current end IA/IB/IC, the earth terminal G on shielding sheet.Corresponding is with it the definition of output port leading-out terminal respectively drawing pin, concrete, can with reference to figure 3 and Fig. 6.Draw port and be defined as shared input mouth IN, shared grounding port G, A coil output mouth IA, B coil output mouth IB and C coil output mouth IC for five of leading-out terminal.Lead-in wire the end of a thread on coil 3 and corresponding leading-out terminal draw pin and weld, namely three earth terminal G shielded on sheets of coil 3 are welded on and draw on pin G, three input current end IN the end of a thread of coil 3 are welded on and draw on pin IN, A coil output current end IA the end of a thread is welded on and draws on pin IA, B coil output current end IB the end of a thread is welded on and draws on pin IB, and C coil output current end IC the end of a thread is welded on and draws on pin IC.The process of welding need be paid special attention to avoid adjacently to draw short circuit between pin.
Complete after lead-in wire the end of a thread and leading-out terminal draw welding between pin, leading-out terminal is fixed on shell, a kind of threephase current transformer product of the present invention after injecting casting glue solidification, can be completed.
In Material selec-tion, transformer casing of the present invention and casting glue all select insulating polymer material, are fire-retardant, high-temperature-resistant epoxy resin material more specifically, improve the reliability of instrument transformer product of the present invention, fail safe.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a threephase current transformer, it is characterized in that, comprise: housing, be provided with three support columns in described housing, each support column is provided with iron core, described iron core is wound with winding, be provided with the first insulating barrier between described winding and iron core, be provided with the second insulating barrier at the outer surface of the iron core being wound with winding, the outside of described second insulating barrier is provided with shielding sheet, the head and the tail two ends of described shielding sheet directly do not contact, and described shell is provided with five binding posts: IN, G, IA, IB and IC; The input of described winding is all connected on binding post IN, and described shielding sheet is connected to lead-in wire, and described lead-in wire is connected on binding post G, and the output of described winding connects binding post IA, IB or IC; Contact resistance between the input of described winding and output; Also comprise the casting glue for closing whole device.
2. a kind of threephase current transformer according to claim 1, is characterized in that, described support column is hollow cylinder.
3. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described shielding sheet is copper foil.
4. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described winding is enamelled wire.
5. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described lead-in wire is enamelled wire.
6. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described resistance is multicolored loop resistance.
7. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described casting glue is fire-retarded epoxy resin.
8. a kind of threephase current transformer according to claim 7, is characterized in that, the curing time of described casting glue is directly proportional to temperature.
9. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described binding post is contact pin type binding post.
10. a kind of threephase current transformer according to claim 1 and 2, is characterized in that, described core material is ultracrystallite magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610112285.7A CN105575643A (en) | 2016-02-29 | 2016-02-29 | Three-phase current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610112285.7A CN105575643A (en) | 2016-02-29 | 2016-02-29 | Three-phase current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105575643A true CN105575643A (en) | 2016-05-11 |
Family
ID=55885671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610112285.7A Pending CN105575643A (en) | 2016-02-29 | 2016-02-29 | Three-phase current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105575643A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057454A (en) * | 2016-06-27 | 2016-10-26 | 国网江苏省电力公司盐城供电公司 | Middle-high voltage zero sequence current transformer |
| CN109616305A (en) * | 2018-11-27 | 2019-04-12 | 山东航天电子技术研究所 | A kind of three-phase integrated straight-through current transformer |
| CN110491662A (en) * | 2019-08-29 | 2019-11-22 | 中国振华（集团）新云电子元器件有限责任公司 | A kind of assemble method of combination type transformer |
Citations (11)
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|---|---|---|---|---|
| JPH06267396A (en) * | 1993-03-16 | 1994-09-22 | Hitachi Ltd | Zero-phase current transformer |
| CN201435302Y (en) * | 2009-06-03 | 2010-03-31 | 河北申科电子股份有限公司 | Current mutual inductor for voltage output |
| CN201616342U (en) * | 2009-12-08 | 2010-10-27 | 平高集团有限公司 | Electronic type high-voltage current transformer |
| CN201629221U (en) * | 2010-03-30 | 2010-11-10 | 符婵 | Zero sequence transformer of power leakage protection device |
| JP2011004567A (en) * | 2009-06-22 | 2011-01-06 | Mitsubishi Electric Corp | Gas-insulated switchgear |
| JP2011243773A (en) * | 2010-05-19 | 2011-12-01 | Panasonic Electric Works Co Ltd | Zero-phase-sequence current transformer |
| CN202352508U (en) * | 2011-11-18 | 2012-07-25 | 江苏安科瑞电器制造有限公司 | Low-voltage combined three-phase current transformer |
| CN102881438A (en) * | 2012-09-17 | 2013-01-16 | 熊江咏 | Electronic current transformer matched with low-voltage circuit breaker |
| CN103996510A (en) * | 2014-05-09 | 2014-08-20 | 安庆天瑞新材料科技股份有限公司 | Novel zero sequence current mutual inductor capable of increasing overload limit non-operating currents |
| CN203839185U (en) * | 2014-03-07 | 2014-09-17 | 天津市泰莱电力设备技术有限公司 | Three-phase combined indoor current transformer convenient to maintain |
| CN205582720U (en) * | 2016-02-29 | 2016-09-14 | 济南铂晶电子科技有限公司 | Three -phase current transformer |
-
2016
- 2016-02-29 CN CN201610112285.7A patent/CN105575643A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06267396A (en) * | 1993-03-16 | 1994-09-22 | Hitachi Ltd | Zero-phase current transformer |
| CN201435302Y (en) * | 2009-06-03 | 2010-03-31 | 河北申科电子股份有限公司 | Current mutual inductor for voltage output |
| JP2011004567A (en) * | 2009-06-22 | 2011-01-06 | Mitsubishi Electric Corp | Gas-insulated switchgear |
| CN201616342U (en) * | 2009-12-08 | 2010-10-27 | 平高集团有限公司 | Electronic type high-voltage current transformer |
| CN201629221U (en) * | 2010-03-30 | 2010-11-10 | 符婵 | Zero sequence transformer of power leakage protection device |
| JP2011243773A (en) * | 2010-05-19 | 2011-12-01 | Panasonic Electric Works Co Ltd | Zero-phase-sequence current transformer |
| CN202352508U (en) * | 2011-11-18 | 2012-07-25 | 江苏安科瑞电器制造有限公司 | Low-voltage combined three-phase current transformer |
| CN102881438A (en) * | 2012-09-17 | 2013-01-16 | 熊江咏 | Electronic current transformer matched with low-voltage circuit breaker |
| CN203839185U (en) * | 2014-03-07 | 2014-09-17 | 天津市泰莱电力设备技术有限公司 | Three-phase combined indoor current transformer convenient to maintain |
| CN103996510A (en) * | 2014-05-09 | 2014-08-20 | 安庆天瑞新材料科技股份有限公司 | Novel zero sequence current mutual inductor capable of increasing overload limit non-operating currents |
| CN205582720U (en) * | 2016-02-29 | 2016-09-14 | 济南铂晶电子科技有限公司 | Three -phase current transformer |
Non-Patent Citations (1)
| Title |
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| 杨奎河，赵玲玲: "《新编电工手册》", 29 February 2012, 中国电力出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057454A (en) * | 2016-06-27 | 2016-10-26 | 国网江苏省电力公司盐城供电公司 | Middle-high voltage zero sequence current transformer |
| CN109616305A (en) * | 2018-11-27 | 2019-04-12 | 山东航天电子技术研究所 | A kind of three-phase integrated straight-through current transformer |
| CN110491662A (en) * | 2019-08-29 | 2019-11-22 | 中国振华（集团）新云电子元器件有限责任公司 | A kind of assemble method of combination type transformer |
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Application publication date: 20160511 |
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| RJ01 | Rejection of invention patent application after publication |