CN105719790A - Zero-sequence current transformer - Google Patents
Zero-sequence current transformer Download PDFInfo
- Publication number
- CN105719790A CN105719790A CN201610097601.8A CN201610097601A CN105719790A CN 105719790 A CN105719790 A CN 105719790A CN 201610097601 A CN201610097601 A CN 201610097601A CN 105719790 A CN105719790 A CN 105719790A
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- China
- Prior art keywords
- paw
- current transformer
- press
- plate portion
- sequence current
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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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a zero-sequence current transformer. The zero-sequence current transformer comprises a core tube, two compression rings and two sets of press claw components, wherein two groups of guide holes are arranged on the tube wall of the core tube side by side; each group of guide holes are matched with one set of press claw components; each group of guide holes comprise three radial guide holes; each set of press claw components comprise three press claws; each press claw is provided with a press plate part, a guide slide block part and a drive plate part; the press plate parts are located in a tube cavity of the core tube; three spiral grooves are arranged on each compression ring; the drive plate part of each press claw is located in one corresponding spiral groove; a core rod is located in the tube cavity of the core tube; three arc-shaped clamping grooves are arranged on the outer circumference wall of the core rod; each arc-shaped clamping groove is arranged oppositely to an arc-shaped groove in the inner wall of one corresponding press claw; the core rod and the press claw components are combined to form three wire clamping holes; a current transformer body comprises an annular base body; the wire clamping holes are located in a hole cavity of the annular base body; and each compression ring pushes the press plate parts in one corresponding set of press claw components to slide towards the center of the core tube when rotating. The zero-sequence current transformer has relatively good anti-looseness performance.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of zero sequence current mutual inductor.
Background technology
The ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flow into the algebraical sum of telegram in reply stream of any node in circuit equal to zero.Under circuit with the normal situation of electrical equipment, the vector of each phase current is equal to zero, and therefore, the secondary side winding no signal output of zero sequence current mutual inductor, executive component is failure to actuate.When the vector of each phase current occurring to get an electric shock or during leak current fault is not zero, fault current makes to produce magnetic flux in the iron core of zero sequence current mutual inductor, and produced by zero sequence current mutual inductor, electric current is zero-sequence current.When protection mechanism receives this zero sequence current signal, corresponding protection act can be taked according to electrical leakage quantity.
Mostly the mounting means of existing zero sequence current mutual inductor is to adopt flange install fixing or adopt bonding mode to fix, and its installation site is it is generally required to reserve, so that the application of zero sequence current mutual inductor is subject to more restriction.
Summary of the invention
It is an object of the invention to provide a kind of zero sequence current mutual inductor with double shield and better anti-loosening effect.
The technical scheme realizing the object of the invention is: a kind of zero sequence current mutual inductor, including a core pipe, two pressure rings and two casing pressure claw assemblies；Being provided with two groups of pilot holes on core tube wall side by side, each group pilot hole and a set of paw assembly are adaptive；Each group pilot hole includes three radially-directed holes；Each casing pressure claw assembly includes three paws；Each paw is provided with pressing plate portion, guide runner portion and driver plate portion；Each pressing plate portion is arranged in core pipe tube chamber；Core tube wall is stretched out in the outer end in the guide runner portion of paw, and each driver plate portion is positioned at outside core tube wall；Each paw reciprocatingly slides along a corresponding radially-directed hole；Each pressure ring rotates and is arranged on the periphery wall of core pipe, and the end wall that each pressure ring and guide runner portion adjoin is provided with three helicla flutes, and these three helicla flutes are adaptive with three driver plate portions in corresponding a set of paw assembly respectively；The driver plate portion of each paw is arranged in a corresponding helicla flute；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with three arc clip slots, and each arc clip slot is axially extending along core pipe, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole；Plug and the combination of each casing pressure claw assembly form three clamp holes；Current transformer includes annular matrix, and clamp hole is arranged in annular matrix vestibule；Pushed the driver plate portion of a corresponding paw when each pressure ring rotates by helicla flute, and then promote the pressing plate portion in corresponding a set of paw assembly to slide towards core tube hub.
In technique scheme, current transformer also includes intelligent control module；Intelligent control module includes wireless transmit/receive units, and the secondary voltage signal that intelligent control module is sensed annular matrix by wireless transmit/receive units sends distance host to.
In technique scheme, on the end wall of the adjacent annular gear platform of a pressure ring, it is provided with annular arrangements groove；This current transformer is fixed in the resettlement groove of pressure ring.
The present invention has positive effect: (1) present invention adopts two casing pressure claw assemblies to be clamped on same cable, and drive corresponding a set of paw assembly respectively by two pressure rings, the clamp operation making each casing pressure claw assembly can individually carry out, this structure has the effect of double shield, in use go wrong even if wherein a set of, also have its service behaviour of another set of guarantee.(2) present invention drives paw clamping electric power cable by helicla flute, compares with by traditional bolt assembly clamping electric power cable, has the anti-loosening effect of excellence, be effectively ensured the reliability of long-term work.
Accompanying drawing explanation
The one that Fig. 1 is the first structure of the present invention partly cuts open structural representation；
Fig. 2 is a kind of perspective view after zero sequence current mutual inductor shown in Fig. 1 removes current transformer；
Fig. 3 is a kind of front view of zero sequence current mutual inductor shown in Fig. 1；
Fig. 4 is that shown in Fig. 1, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 5 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 1；
Fig. 6 is a kind of explosive view after zero sequence current mutual inductor shown in Fig. 1 removes pressure ring.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 5, including 2, plug of a core pipe, 8, two pressure rings of 7, current transformer 1 and two casing pressure claw assemblies 3.
In the present embodiment, core pipe 2,7, two pressure rings of plug 1 and two casing pressure claw assemblies 3 all adopt insulant to make.
Core pipe periphery wall is provided with the annular gear platform 21 of evagination；Being provided with two groups of pilot holes on core tube wall vertically side by side, each group pilot hole and a set of paw assembly are adaptive；Each group pilot hole includes three radially-directed holes 23, and these three radially-directed holes are evenly distributed on core tube wall along core pipe circumference；In the present embodiment, each radially-directed hole extends radially through core tube wall along core pipe.
Each radially-directed hole 23 includes the guiding slide opening 231 and the anticreep slide opening 232 that axially set gradually along core pipe；Guiding slide opening is arranged on the edge of core pipe two side ends, and anticreep slide opening connects with guiding slide opening；The radial cross-sectional shape in each radially-directed hole is T-shaped；Each radially-directed hole 23 forms a breach being positioned at core tube edges place.
Each casing pressure claw assembly all includes three paws 5；Each paw is provided with pressing plate portion 51, along the guide runner portion 52 that core pipe radially extends and the driver plate portion 53 that is arranged in guide runner portion；The driver plate portion of each paw is provided in the flange axially projecting along core pipe in each guide runner portion, and the outboard end of this flange is provided with chisel teeth 54.
Each pressing plate portion is respectively positioned in core pipe tube chamber, and core tube wall is stretched out in the outer end in the guide runner portion of each paw, and each driver plate portion is positioned at outside core tube wall；Each guide runner portion 52 includes guide part 521 and anti-delinking part 522, and guide part is arranged in the guiding slide opening in a corresponding radially-directed hole, and anti-delinking part is arranged in the anticreep slide opening in a corresponding radially-directed hole；The radial cross-sectional shape of guide part and anti-delinking part is adaptive with radially-directed hole T-shaped.Each paw is under the spacing of radially-directed hole and guide effect, along core caliber to reciprocatingly sliding；The inwall in each pressing plate portion is provided with arcuate groove 55.
Two pressure rings 1 rotate and are arranged on the periphery wall of core pipe, and the both sides of separation annular gear platform；The internal perisporium of each pressure ring is the smooth inner wall adjacent with the slip of core pipe periphery wall；The periphery wall of each pressure ring is provided with multiple binding groove 11；One side of each pressure ring and annular gear platform slide adjacent, and another side and the guide runner portion in corresponding a set of paw assembly slide adjacent；In the present embodiment, the end wall adjacent with guide runner portion of each pressure ring is provided with three helicla flutes 12, and these three helicla flutes and three driver plate portions in corresponding a set of paw assembly are adaptive.
In the present embodiment, each helicla flute includes the anticreep district 121 that connects with pressure ring vestibule 13 and the accommodating area 122 away from pressure ring vestibule；The diapire in anticreep district is provided with multiple wedge shape anticreep tooth 123, and the chisel teeth of each wedge shape anticreep tooth and paw is adaptive；Accommodating area is smooth chute；The present embodiment, when operation, adopts the binding groove that hook type spanner catches on pressure ring to twist pressure ring.
Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with three arc clip slots 71, and each arc clip slot is axially extending along core pipe, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole 61；So the present embodiment can form three clamp holes, can be used for simultaneously clamping on three cables.
The periphery wall of plug is provided with four the support location flanges 72 protruded along core pipe radial direction, the internal perisporium of core pipe is provided with four positioning runners 24, each outboard end supporting location flange is embedded in a corresponding positioning runner, thus plug is positioned in the tube chamber of core pipe.
The present embodiment, in order to promote chuck strength, is also provided with multiple puncture 6 in each arcuate groove and arc clip slot；Specifically, the radially protruding along core pipe portion is respectively punctured.
In the present embodiment, each paw is the integral piece made by injection mo(u)lding, and each puncture is made when injection mo(u)lding；In concrete practice, puncture may be used without alternate manner and makes；In each arcuate groove, such as it is provided with multiple installation draw-in groove, then the puncture sheet adopting insulant to make is inlaid in corresponding one and installs in draw-in groove；Puncturing sheet include installation portion and sting blade, installation portion is inlaid in installation draw-in groove, and thorn blade then exposes installation draw-in groove and forms puncture.In concrete practice, it is also possible to adopt in the mode being threaded in each arc clip slot and arcuate groove, also can improving clamping sigma compactness energy.
This current transformer includes annular matrix 81 and intelligent control module；In the present embodiment, on the end wall of the adjacent annular gear platform of a pressure ring, it is provided with annular arrangements groove；This current transformer is fixed in the resettlement groove of pressure ring；Pressure ring periphery wall is still provided with binding groove.Intelligent control module can include wireless transmit/receive units, and the zero sequence current signal that intelligent control module is sensed annular matrix by wireless transmit/receive units sends distance host to, to realize the long-range no worker monitor of precision；This structure can make full use of space, is conducive to the small-sized and integrated of entirety.
In concrete practice, this current transformer could be secured on other position, as long as making clamp hole be arranged in annular matrix vestibule, is all feasible.
The driver plate portion of each paw is arranged in a corresponding helicla flute；Each helicla flute is along with pressure ring synchronous axial system so that a corresponding driver plate portion is from being positioned at accommodating area to being positioned at anticreep district, namely this driver plate portion is produced pushing effect；Paw in the present embodiment, in each pressure ring individually corresponding a set of paw assembly so that the pressing plate portion in each casing pressure claw assembly is close to each other towards core tube hub, thus clamping is arranged in the electric power cable in clamp hole.
When the chisel teeth in each pressing plate portion is clamped on the wedge shape anticreep tooth in corresponding anticreep district, wedge shape anticreep tooth prevents pressure ring from reversing, so that the present embodiment has good anti-loosening effect.
The present embodiment, in order to connect electricity from insulating power cable or promote chuck strength, is also provided with multiple puncture 62 in each arcuate groove；Specifically, respectively puncture along core pipe radially protruding.The existence punctured, it is possible to without insulating power cable is carried out peeling process, can effectively connect electricity.In concrete practice, if what to clamp is bare wire, then can be not provided with puncturing.
In the present embodiment, each paw is the integral piece made by casting forming, and each puncture is made when casting forming；In concrete practice, puncture may be used without alternate manner and makes；In each arcuate groove, such as it is provided with multiple installation draw-in groove, then installs in draw-in groove being inlaid in corresponding one by the die-cut puncture sheet made；Puncturing sheet include installation portion and sting blade, installation portion is inlaid in installation draw-in groove, and thorn blade then exposes installation draw-in groove and forms puncture.The benefit of this structure is to puncture sheet the material different with paw can be adopted to make, and especially selects and treats that same material used by clamp cable is made, being conducive to obtaining preferably electric property.
The present embodiment is by being arranged on cable clamping at the longitudinal center line place of zero sequence current mutual inductor, and its gravity centre distribution is relatively reasonable, when on the overhead power line of high-altitude, is conducive to alleviating vibration；Additionally, each paw is positioned by the present embodiment by having the slope groove of wedge shape anticreep tooth, it is possible to play the technique effect preventing from falling back, and compares with by traditional bolt assembly clamping electric power cable, in anti-loosening effect particularly excellent, be effectively ensured the reliability of long-term work.
The present embodiment adopts two casing pressure claw assemblies to be clamped on same cable, has the effect of dual fail-safe, in use goes wrong even if wherein a set of, also has its service behaviour of another set of guarantee.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the apparent change that these connotations belonging to the present invention are extended out or variation still fall within protection scope of the present invention.
Claims (3)
1. a zero sequence current mutual inductor, it is characterised in that: include a core pipe, two pressure rings and two casing pressure claw assemblies；Being provided with two groups of pilot holes on core tube wall side by side, each group pilot hole and a set of paw assembly are adaptive；Each group pilot hole includes three radially-directed holes；Each casing pressure claw assembly includes three paws；Each paw is provided with pressing plate portion, guide runner portion and driver plate portion；Each pressing plate portion is arranged in core pipe tube chamber；Core tube wall is stretched out in the outer end in the guide runner portion of paw, and each driver plate portion is positioned at outside core tube wall；Each paw reciprocatingly slides along a corresponding radially-directed hole；Each pressure ring rotates and is arranged on the periphery wall of core pipe, and the end wall that each pressure ring and guide runner portion adjoin is provided with three helicla flutes, and these three helicla flutes are adaptive with three driver plate portions in corresponding a set of paw assembly respectively；The driver plate portion of each paw is arranged in a corresponding helicla flute；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with three arc clip slots, and each arc clip slot is axially extending along core pipe, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole；Plug and the combination of each casing pressure claw assembly form three clamp holes；Current transformer includes annular matrix, and clamp hole is arranged in annular matrix vestibule；Pushed the driver plate portion of a corresponding paw when each pressure ring rotates by helicla flute, and then promote the pressing plate portion in corresponding a set of paw assembly to slide towards core tube hub.
2. zero sequence current mutual inductor according to claim 1, it is characterised in that: current transformer also includes intelligent control module；Intelligent control module includes wireless transmit/receive units, and the secondary voltage signal that intelligent control module is sensed annular matrix by wireless transmit/receive units sends distance host to.
3. zero sequence current mutual inductor according to claim 1, it is characterised in that: on the end wall of the adjacent annular gear platform of a pressure ring, it is provided with annular arrangements groove；This current transformer is fixed in the resettlement groove of pressure ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097601.8A CN105719790A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097601.8A CN105719790A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105719790A true CN105719790A (en) | 2016-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610097601.8A Withdrawn CN105719790A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105719790A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN202151702U (en) * | 2011-07-05 | 2012-02-29 | 湖北三江航天险峰电子信息有限公司 | Tool for centring and clamping large-scale rotational part |
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
-
2016
- 2016-01-15 CN CN201610097601.8A patent/CN105719790A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN202151702U (en) * | 2011-07-05 | 2012-02-29 | 湖北三江航天险峰电子信息有限公司 | Tool for centring and clamping large-scale rotational part |
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160629 |
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| WW01 | Invention patent application withdrawn after publication |