CN102867617B - Zero sequence current mutual inductor and preparation method thereof - Google Patents
Zero sequence current mutual inductor and preparation method thereof Download PDFInfo
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- CN102867617B CN102867617B CN201210381572.XA CN201210381572A CN102867617B CN 102867617 B CN102867617 B CN 102867617B CN 201210381572 A CN201210381572 A CN 201210381572A CN 102867617 B CN102867617 B CN 102867617B
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Abstract
The invention provides a kind of zero sequence current mutual inductor and preparation method thereof, this zero sequence current mutual inductor comprises annular outer cover, current mutual inductor coil and mounting seat.This manufacture method comprises the following steps: select soft cold-reduced sheet, punching becomes shell; Select the punching of cold rolling selenium steel disc to become band, turn to annular core, then iron core is put into row high-temperature process and dipping lacquer process; With Kapton Tape, annular core is evenly held; Zero sequence current mutual inductor coil is obtained toward coiling enamelled wire on the annular core of above-mentioned specification with coil winding machine; Zero sequence current mutual inductor coil good for coiling is assembled in shell and namely obtains zero sequence current mutual inductor; The zero sequence current mutual inductor assembled is tested.Every technical performance of the zero sequence current mutual inductor adopting this production technology to produce is more perfect; make it have highly sensitive, equilibrium response good, high safety, cost of manufacture are low, long service life and practical advantage, the powerful guarantee safe operation of aftercurrent action protecting series products.
Description
Technical field
The present invention relates to a kind of current transformer, specifically, relate to a kind of zero sequence current mutual inductor and preparation method thereof.
Background technology
In the distribution transformer low-voltage circuit that the vast rural area of China uses; popularity application RCD; but; due to the difference in the manufacturing process of the crucial detection part zero sequence current mutual inductor in RCD, make this series products can not receive good protected effect.For example: adopt the zero sequence current mutual inductor that high permeability magnetic material manufactures, cost is higher, although sensitivity and equilibrium response better, but magnetic coercive force is poor, when there is big current metallic short circuit ground connection in low voltage three-phase four-wire circuit, big current closed-loop path will certainly be formed in zero sequence current mutual inductor loop, easily cause the iron core magnetic in zero sequence current mutual inductor saturated, cause RCD tripping; Adopt the zero sequence current mutual inductor that ordinary silicon steel disc magnetic material manufactures; cost is low; but sensitivity and equilibrium response poor; when occur in low voltage three-phase four-wire circuit significantly unsymmetrical current time; can be poor because of the equilibrium response of zero sequence current mutual inductor, cause the frequent misoperation of RCD.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of zero sequence current mutual inductor is provided, and the manufacture method of this zero sequence current mutual inductor is provided simultaneously, this manufacture method craft science, operating procedure are simple, the zero sequence current mutual inductor using the method to make have highly sensitive, equilibrium response good, high safety, cost of manufacture are low, long service life and practical advantage.
To achieve these goals, the technical solution adopted in the present invention is: a kind of zero sequence current mutual inductor, it comprises annular outer cover, current mutual inductor coil and mounting seat, the annular outer cover upper cover that described annular outer cover comprises annular outer cover base and engages with described annular outer cover base, described annular outer cover base is provided with current mutual inductor coil groove; Described current mutual inductor coil comprises annular core and is wound on the coil on described annular core, and described current mutual inductor coil is coaxially arranged in described current mutual inductor coil groove, and described annular outer cover is fixedly installed in described mounting seat.
Based on above-mentioned, the endocyclic outer wall of described annular outer cover base extends back and is set to ferromagnetic conduit.
A manufacture method for zero sequence current mutual inductor, this manufacture method comprises the following steps:
Step 1: the making of shell; Select soft cold-reduced sheet, be placed on punch forming on punch press, then carry out hot dip process;
Step 2: the making of iron core; Select the punching of cold rolling selenium steel disc to become band, by certain specification, turn to annular core on the winder, then the iron core that coiling is good is put into High frequency heat treating furnace and carry out high-temperature process, treatment temperature controls at 400-450 DEG C, keeps 2 hours; Finally, immediately dipping lacquer process is carried out to the annular core after high-temperature process;
Step 3: the wrapping of annular core; With Kapton Tape, annular core is evenly held;
Step 4: the coiling of coil; Obtain zero sequence current mutual inductor coil with coil winding machine toward coiling enamelled wire on the annular core of above-mentioned specification, then dipping lacquer process is carried out to this zero sequence current mutual inductor coil;
Step 5: finished product assembles; The zero sequence current mutual inductor coil handled well is assembled in shell, go out lead-out wire by the wire bonds that connects of different colours, and butt welding contact carries out insulation processing;
Step 6: finished product test: the A.C. voltmeter by a range in parallel for the zero sequence current mutual inductor coil two ends assembled being 10 volts, a range of also connecting in coil is the miliammeter of 300 milliamperes, then, pass to 5 volts of alternating voltages to coil, miliammeter instruction is qualified zero sequence current mutual inductor at 160-180 milliampere.
Based on above-mentioned, the height of the annular core turned to is 10-12 millimeter.
Based on above-mentioned, described enamelled wire selects diameter to be 0.19-0.21mm
2round copper enamelled wire.
Hinge structure of the present invention has substantive distinguishing features and progress, specifically, the method takes coiling and the heat treatment method of annular core, employing has high electric strength, high temperature resistant, high adhesion strength, erosion-resisting Kapton Tape is to the wrapping method of annular core, craft science, operating procedure is simple, existing manufacture craft is improved, every technical performance of the zero sequence current mutual inductor that this production technology of employing is produced is more perfect, have highly sensitive, equilibrium response is good, high safety, cost of manufacture is low, long service life and practical advantage, the powerful guarantee safe operation of aftercurrent action protecting series products.
Accompanying drawing explanation
Fig. 1 is the structural representation of zero sequence current mutual inductor.
Fig. 2 be zero sequence current mutual inductor side-looking structural representation.
Fig. 3 is the structural representation of current mutual inductor coil.
Fig. 4 is iron core test circuit figure of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1, Figure 2 and Figure 3, a kind of zero sequence current mutual inductor, it comprises annular outer cover 1, current mutual inductor coil 2 and mounting seat 3, described annular outer cover 1 comprises annular outer cover base and annular outer cover upper cover 12, described annular outer cover base is provided with current mutual inductor coil groove 111, the endocyclic outer wall of described annular outer cover base extends back and forms ferromagnetic conduit 112, to be used for shielding the interference of extraneous magnetic field; The coil 22 that described current mutual inductor coil 2 comprises annular core 21 and is wound on described annular core 21, described coil 22 adopts circle copper enamelled wire Double-wire parallel wound on described annular core 21, and the secondary forming this zero sequence current mutual inductor exports winding L 1 and secondary test winding L 2; Described current mutual inductor coil 2 is coaxially arranged in described current mutual inductor coil groove 111, and described annular outer cover 1 is fixedly installed in described mounting seat 3.
The manufacture method of this zero sequence current mutual inductor comprises the following steps:
Step 1: the making of annular outer cover 1; First, according to the needs of different size zero sequence current mutual inductor, make the annular outer cover moulds of industrial equipment of different size; Then, select soft cold-reduced sheet, be placed on punch forming on punch press, then to the annular outer cover 1 of punch forming carry out hot dip process annular outer cover finished product.
Step 2: the making of annular core 21; The punching of Z11 type cold rolling selenium steel disc is selected to become band, turn to annular core 21 on the winder, in the process of coiling, keep density and the uniformity of described annular core 21, and do not allow to occur tapering, the annular core 21 of coiling is highly 11 millimeters, and its internal diameter and external diameter are then determined according to the capacity of zero sequence current mutual inductor; Then, annular core 21 good for coiling is put into High frequency heat treating furnace and carries out high-temperature process, treatment temperature controls at 450 DEG C, keeps 2 hours, after coming out of the stove, carries out dipping lacquer process immediately to annular core 21.It is significant to note that, in the process of whole processing, strictly prevent the annular core 21 that coiling is good to be out of shape.
Step 3: the wrapping of annular core 21; With having high electric strength, annular core holds two-layer by high temperature resistant, high adhesion strength, erosion-resisting Kapton Tape equably, then can locate with the afterbody of transparent rubberized fabric by Kapton Tape temporarily, operate to facilitate next step.
Step 4: the coiling of coil 22; Be 0.2mm with coil winding machine by diameter
2round copper enamelled wire Double-wire parallel wound, evenly be wound on the annular core described in step 3 and obtain zero sequence current mutual inductor coil 2, wherein, the number of turns of coiling circle copper enamelled wire is 20 circles, and the secondary that can obtain this zero sequence current mutual inductor exports winding L 1 and secondary test winding L 2; Then dipping lacquer process is carried out to this zero sequence current mutual inductor coil 2, so can ensure that this zero sequence current mutual inductor is in any installation site, all there will not be the deviation of action sensitivity.
Step 5: finished product assembles; Zero sequence current mutual inductor coil 2 good for coiling is assembled in annular outer cover 1, goes out lead-out wire by the wire bonds that connects of different colours, and carry out the insulation processing of pad.
Step 6: finished product test: as shown in Figure 4, the secondary test winding L 2 of zero sequence current mutual inductor coil 2 range of connecting is the miliammeter 101 of 300 milliamperes, 5 volts of alternating voltages are passed to secondary test winding L 2, a both ends of power range in parallel is the A.C. voltmeter 102 of 10 volts, miliammeter instruction 160-180 milliampere qualified zero sequence current mutual inductor; Zero sequence current mutual inductor qualified after tested, highly sensitive equilibrium response is stablized, in actual applications, the frequent misoperation that the tripping that there will not be magnetic saturation to cause and equilibrium response difference cause.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (3)
1. the manufacture method of a zero sequence current mutual inductor, described zero sequence current mutual inductor comprises annular outer cover, current mutual inductor coil and mounting seat, the annular outer cover upper cover that described annular outer cover comprises annular outer cover base and engages with described annular outer cover base, described annular outer cover base is provided with current mutual inductor coil groove; Described current mutual inductor coil comprises annular core and is wound on the coil on described annular core, and described current mutual inductor coil is coaxially arranged in described current mutual inductor coil groove, and described annular outer cover is fixedly installed in described mounting seat; The endocyclic outer wall of described annular outer cover base extends back and is set to ferromagnetic conduit; This manufacture method comprises the following steps:
Step 1: the making of annular outer cover; Select soft cold-reduced sheet, be placed on punch forming on punch press, then carry out hot dip process;
Step 2: the making of annular core; Select the punching of cold rolling selenium steel disc to become band, by certain specification, turn to annular core on the winder, then the iron core that coiling is good is put into High frequency heat treating furnace and carry out high-temperature process, treatment temperature controls at 400-450 DEG C, keeps 2 hours; Finally, immediately dipping lacquer process is carried out to the annular core after high-temperature process;
Step 3: the wrapping of annular core; With Kapton Tape, annular core is evenly held;
Step 4: the coiling of coil; Obtain zero sequence current mutual inductor coil with coil winding machine toward coiling enamelled wire on the annular core of above-mentioned specification, then dipping lacquer process is carried out to this zero sequence current mutual inductor coil;
Step 5: finished product assembles; The zero sequence current mutual inductor coil handled well is assembled in shell, go out lead-out wire by the wire bonds that connects of different colours, and butt welding contact carries out insulation processing;
Step 6: finished product test: the A.C. voltmeter by a range in parallel for the zero sequence current mutual inductor coil two ends assembled being 10 volts, a range of also connecting in coil is the miliammeter of 300 milliamperes, then, pass to 5 volts of alternating voltages to coil, miliammeter instruction is qualified zero sequence current mutual inductor at 160-180 milliampere.
2. the manufacture method of zero sequence current mutual inductor according to claim 1, is characterized in that: the height of the annular core turned to is 10-12 millimeter.
3. the manufacture method of zero sequence current mutual inductor according to claim 2, is characterized in that: described enamelled wire selects diameter to be 0.19-0.21mm
2round copper enamelled wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210381572.XA CN102867617B (en) | 2012-10-10 | 2012-10-10 | Zero sequence current mutual inductor and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210381572.XA CN102867617B (en) | 2012-10-10 | 2012-10-10 | Zero sequence current mutual inductor and preparation method thereof |
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| CN102867617A CN102867617A (en) | 2013-01-09 |
| CN102867617B true CN102867617B (en) | 2015-12-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104215815A (en) * | 2014-08-14 | 2014-12-17 | 河南开启电力实业有限公司 | Leakage current monitoring device of lightning arrester |
| CN105242096A (en) * | 2015-10-28 | 2016-01-13 | 河南开启电力实业有限公司 | Voltage/ current detection sensor and production method thereof |
| CN107464681A (en) * | 2016-06-04 | 2017-12-12 | 常州三恒电器有限公司 | The production technology of arc fault protector transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369485A (en) * | 2007-08-13 | 2009-02-18 | 利安电气(鹤山)科技发展有限公司 | Production method of high-impedance and high-sensibility zero-sequence current transformer |
| CN202285197U (en) * | 2011-10-19 | 2012-06-27 | 浙江天际互感器有限公司 | Indoor zero-sequence current transformer |
| CN202816644U (en) * | 2012-10-10 | 2013-03-20 | 河南开启电力实业有限公司 | Zero sequence current transformer |
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2012
- 2012-10-10 CN CN201210381572.XA patent/CN102867617B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369485A (en) * | 2007-08-13 | 2009-02-18 | 利安电气(鹤山)科技发展有限公司 | Production method of high-impedance and high-sensibility zero-sequence current transformer |
| CN202285197U (en) * | 2011-10-19 | 2012-06-27 | 浙江天际互感器有限公司 | Indoor zero-sequence current transformer |
| CN202816644U (en) * | 2012-10-10 | 2013-03-20 | 河南开启电力实业有限公司 | Zero sequence current transformer |
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Effective date of registration: 20180523 Address after: 454950 eastern section of Chuang Road, Wuzhi industrial agglomeration area, Jiaozuo, Henan Patentee after: Cable Polytron Technologies Inc. Address before: 451162 electric power company on the west side of Xingang road in Zhengzhou, Henan. Patentee before: HENAN KAIQI POWER INDUSTRY Co.,Ltd. |
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Granted publication date: 20151209 Termination date: 20211010 |
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