CN105609291A - Improved three-phase power zero-sequence current transformer - Google Patents
Improved three-phase power zero-sequence current transformer Download PDFInfo
- Publication number
- CN105609291A CN105609291A CN201610097374.9A CN201610097374A CN105609291A CN 105609291 A CN105609291 A CN 105609291A CN 201610097374 A CN201610097374 A CN 201610097374A CN 105609291 A CN105609291 A CN 105609291A
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- China
- Prior art keywords
- tube
- plane
- current transformer
- paw
- core
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- 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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- 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
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- 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
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
- H01F2038/305—Constructions with toroidal magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses an improved three-phase power zero-sequence current transformer, which comprises a base tube, a core tube, two sets of press claw components, two flat nuts and a current transformer body, wherein the current transformer body sleeves the base tube; crimping bosses are arranged on the base tube; radial limiting slide holes are formed in the tube wall of the core tube; a stopping table is arranged on the inner circumference wall of the core tube; the two flat nuts are rotationally arranged in a tube cavity of the core tube; the two flat nuts are separately located at two sides of the stopping table; drive thread parts in each set of press claw component all are located at one side, far away from the stopping table, of the corresponding flat nut; each flat nut comprises a fastening part and a plane thread part which is meshed and matched with the drive thread parts of the press claws in the corresponding set of press claw component; each plane thread part is annular; an archimedes spiral groove is arranged on each plane thread part; a thread groove matched with each archimedes spiral groove is arranged on each drive thread part of each pressure claw component; and each flat nut drives the plane thread part thereof to rotate in a reciprocating manner, so that corresponding one set of press claw component is driven. The improved three-phase power zero-sequence current transformer has an excellent anti-looseness effect.
Description
Technical field
The invention belongs to power technology field, be specifically related to a kind of improved three-phase electric power zero sequence current mutual inductor.
Background technology
The general principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): the telegram in reply stream that flows into arbitrary node in circuitAlgebraical sum equal zero. In circuit and the normal situation of electrical equipment, the vector of each phase current equals zero, therefore,The secondary side winding no signal output of zero sequence current mutual inductor, executive component is failure to actuate. In the time there is electric shock or leak current faultThe vector of each phase current non-vanishing, fault current makes to produce magnetic flux, zero-sequence current in the iron core of zero sequence current mutual inductorThe electric current that transformer produces is zero-sequence current. When protection mechanism receives this zero sequence current signal, can be according to electrical leakage quantityTake corresponding protection action.
Mostly the mounting means of existing zero sequence current mutual inductor is to adopt flange install fixing or adopt bonding mode to fix, itsInstallation site generally needs reserved, therefore make its application be subject to more restriction.
Summary of the invention
The object of this invention is to provide and be a kind ofly convenient to that location is installed, there is better firmly degree, effectively prevent the improvement of becoming flexibleType three-phase power zero sequence current mutual inductor.
The technical scheme that realizes the object of the invention is: a kind of improved three-phase electric power zero sequence current mutual inductor, comprises a basePipe, core pipe, two casing pressure claw assemblies, two plane nuts and a current transformer; Current transformer is set in baseGuan Shang; The internal perisporium of base tube is provided with crimping boss; Core pipe and base tube arrange with one heart and are positioned at base tube tube chamber; The pipe of core pipeWall is provided with multiple radially spacing slide openings, and the internal perisporium of core pipe is provided with a gear platform; Each casing pressure claw assembly comprises three pressuresPawl, each paw comprises pressing plate portion, guide runner portion from from the inwall of pressing plate portion to projecting inward formation and is arranged on guide runnerDriving threaded portion in portion; Each pressing plate portion is positioned between base tube inwall and core tube wall, and each guide runner portion inserts on core pipeIn a corresponding radially spacing slide opening, respectively drive threaded portion to stretch in the tube chamber of core pipe; Each pressing plate portion and a corresponding pressureConnect boss clamping and form a clamp hole; Two plane nuts all rotate and are arranged in core pipe tube chamber, and two plane nuts divideOccupy the both sides of gear platform; Driving threaded portion in each casing pressure claw assembly is all positioned at a corresponding plane nut away from one of gear platformSide; Each plane nut comprises fastening part and engages adaptive with the driving threaded portion of each paw in corresponding a set of paw assemblyFlat thread portion; Flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove; Driving of each paw assemblyMoving threaded portion is provided with and the thread groove of this archimedean spiral groove adaptation; Drive threaded portion to be arranged on place guide runner portionOne side of adjacent flat nut; Fastening part is arranged on interior hexagonal shape fastener hole or the interior hexagonal shape of plane nut centerBinding groove; Each plane nut drives its flat thread portion reciprocating rotation, and then drives each paw in corresponding a set of paw assemblyTowards core tube hub close to each other or away from.
The present invention has positive effect: (1) zero sequence current mutual inductor of the present invention is owing to carrying press claw type retaining mechanism,Do not need reserved installation position, be easy to install, and have good anti-loosening effect, firmly intensity is higher and reliable and stable.(2) the present invention compares with the bolt assembly clamping electric power cable by traditional, can apply larger pressure, and have excellentDifferent anti-loosening effect, effectively ensures the reliability of long-term work. (3) the present invention adopts two casing pressure claw assemblies to clampOn same cable, there is the effect of dual fail-safe, in use go wrong even wherein a set of, also have another set of guaranteeIts service behaviour.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is a kind of perspective view when zero sequence current mutual inductor removes current transformer shown in Fig. 1;
Fig. 3 is a kind of front view of zero sequence current mutual inductor shown in Fig. 2;
Fig. 4 is that the one of zero sequence current mutual inductor shown in Fig. 2 is partly cutd open structural representation;
Fig. 5 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 2;
Fig. 6 is a kind of explosive view when zero sequence current mutual inductor shape removes base tube shown in Fig. 2.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of improved three-phase electric power zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 6, comprises a basePipe 1, core pipe 2, two casing pressure claw assemblies 3, two plane nuts 4 and current transformers 8.
The internal perisporium of base tube is axially arranged with three crimping boss 11 along base tube, and the inwall of each crimping boss is provided with deep-slotted chip breaker 111;The internal perisporium of base tube is axially also provided with four positioning runners 12 along base tube; Core pipe and base tube arrange with one heart and are positioned at base tube tube chamberIn; The periphery wall of core pipe is provided with four along core caliber to protruding the support flange 21 extending, and respectively supports the outboard end of flangeBe arranged in a corresponding positioning runner, thus core pipe supporting and location in the tube chamber of base tube; The tube wall of core pipe is provided with sixIndividual radially spacing slide opening 22, each radially spacing slide opening all radially runs through core tube wall along core pipe; On the internal perisporium of core pipe, establishThree annular gear platforms 23 of oriented projecting inward formation.
Each casing pressure claw assembly comprises three paws 5; Every casing pressure claw assembly and a corresponding plane nut adaptation; Each paw bagDraw together pressing plate portion 51, guide runner portion 52 from from the inwall of pressing plate portion to projecting inward formation and be arranged on guide runner portionDrive threaded portion 53; Pressing plate portion extends axially along base tube, and guide runner portion is along core caliber to extension; Each paw pressing plate portionOuter wall is provided with arc clip slot 511; Each pressing plate portion is positioned between base tube inwall and core tube wall, and each guide runner portion insertsOn core pipe, in a corresponding radially spacing slide opening, respectively drive threaded portion to stretch in the tube chamber of core pipe; Each paw is radially being limitRadially reciprocatingly sliding along core pipe under the guide and limit effect of position slide opening.
In the present embodiment, each radially radial section shape of spacing hole is I-shaped, the radial section shape of each guide runner portionShape is I-shaped with spacing hole adaptation radially; In concrete practice, the radially radial section of spacing hole and guide runner portionShape also can be selected other shape, for example circle, rectangle, square all can, as long as just there is radially-directed and limit effectOK.
In the present embodiment, the arc clip slot of each paw is the deep-slotted chip breaker setting to a corresponding crimping boss just, and this pawThe deep-slotted chip breaker clamping of arc clip slot and this crimping boss forms a clamp hole 6, and each clamp hole is used for clamping a power lineCable; The present embodiment forms three clamp holes altogether, clamps altogether three electric power cables. Because three electric power cables are from matrix slip pipeIn tube chamber, pass, current transformer can carry out zero-sequence current detection to three electric power cables by induction mode, for andShi Faxian leakage current fault, and send real time information to distance host by wireless transmit/receive units, be power circuit intelligenceEnergyization provides basic data. In the present embodiment, current transformer 8 is ring current transformer, this ring current transformerBe set on base tube outer wall. In concrete practice, also can on the outer wall of base tube, detent be set, current transformer positionIn this detent, thereby make current transformer more firm. In the present embodiment, the size in each clamp hole can beDifferent, for clamping the cable of different thicknesses.
Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation annular gear platforms; Each coverDriving threaded portion in paw assembly is all positioned at the side of a corresponding plane nut away from annular gear platform; Each plane nutPeriphery wall and core inside pipe wall slip adjacency, the center of each plane nut is provided with fastening part 42; One side of each plane nutWith annular gear platform slip adjacency, another side is provided with to engage with the driving threaded portion of each paw in corresponding a set of paw assembly and fitsThe flat thread portion 41 of joining; Flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove; Each paw groupThe driving threaded portion of part is provided with and the thread groove of this archimedean spiral groove adaptation, respectively drives threaded portion to be arranged on place and leadsTo a side of slide section adjacent flat nut.
The fastening part of the present embodiment midplane nut is interior hexagonal shape fastener hole or interior hexagonal shape binding groove, and it is twisted operation and adoptsWith inner hexagon spanner; In concrete practice, described fastening part just can adopt other shape, for example square or in-line or plumFlower shape, all can select.
In the present embodiment, each plane nut, in the time of reciprocating rotation, drives its flat thread portion reciprocating rotation, so by withThis flat thread portion engages adaptive driving threaded portion and drives each paw in corresponding a set of paw assembly to move, due to each pawCan only be along radially the moving back and forth of core pipe under the guide and limit effect of spacing slide opening radially, thus make each cover paw groupIn part the move mode of paw be close to each other towards core tube hub or away from, be arranged in each clamp hole thereby unclamp or clampElectric power cable.
The present embodiment gravity centre distribution is comparatively reasonable, on for high-altitude overhead power line time, is conducive to alleviate vibration; SeparatelyOutward, the present embodiment drives paw to clamp electric power cable by flat thread portion, and clamps electric power by traditional bolt assemblyCable is compared, particularly excellent in anti-loosening effect, effectively ensures the reliability of long-term work. In addition, this enforcementExample, by adopt two casing pressure claw assemblies to clamp to same cable, has the effect of dual fail-safe, even wherein in use a set ofGo wrong, also have its service behaviour of another set of guarantee.
The present embodiment can be used as high pressure zero sequence current mutual inductor and uses, for detection of the existence of leakage current, to send out in timeExisting leak current fault.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not to thisThe restriction of working of an invention mode. For those of ordinary skill in the field, also can on the basis of the above descriptionTo make other changes in different forms. Here without also giving exhaustive to all embodiments. And thisThe apparent variation that belongs to connotation of the present invention a bit and extended out or variation still belong to protection scope of the present invention.
Claims (1)
1. an improved three-phase electric power zero sequence current mutual inductor, is characterized in that: comprise a base tube, core pipe,Two casing pressure claw assemblies, two plane nuts and a current transformer; Current transformer is set on base tube; In base tubePerisporium is provided with crimping boss; Core pipe and base tube arrange with one heart and are positioned at base tube tube chamber; The tube wall of core pipe is provided with multiple footpathsTo spacing slide opening, the internal perisporium of core pipe is provided with a gear platform; Each casing pressure claw assembly comprises three paws, and each paw comprisesPressing plate portion, guide runner portion from from the inwall of pressing plate portion to projecting inward formation and be arranged on the driving screw thread guide runner portionPortion; Each pressing plate portion is positioned between base tube inwall and core tube wall, and each guide runner portion inserts a corresponding limit radially on core pipeIn the slide opening of position, respectively drive threaded portion to stretch in the tube chamber of core pipe; Each pressing plate portion and a corresponding crimping boss clamping formA clamp hole; Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation gear platforms;Driving threaded portion in each casing pressure claw assembly is all positioned at the side of a corresponding plane nut away from gear platform; Each plane nut bagDraw together fastening part and engage adaptive flat thread portion with the driving threaded portion of each paw in corresponding a set of paw assembly; PlaneThreaded portion is annular, and flat thread portion is provided with archimedean spiral groove; The driving threaded portion of each paw assembly be provided with andThe thread groove of this archimedean spiral groove adaptation; Drive threaded portion to be arranged on one of place guide runner portion adjacent flat nutSide; Fastening part is arranged on interior hexagonal shape fastener hole or the interior hexagonal shape binding groove of plane nut center; Each plane spiral shellMaster tape moves its flat thread portion reciprocating rotation, and then drives in corresponding a set of paw assembly each paw towards core tube hub each otherNear or away from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097374.9A CN105609291A (en) | 2016-01-15 | 2016-01-15 | Improved three-phase power zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097374.9A CN105609291A (en) | 2016-01-15 | 2016-01-15 | Improved three-phase power zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105609291A true CN105609291A (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610097374.9A Withdrawn CN105609291A (en) | 2016-01-15 | 2016-01-15 | Improved three-phase power zero-sequence current transformer |
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| Country | Link |
|---|---|
| CN (1) | CN105609291A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| 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 |
| CN203679326U (en) * | 2014-01-24 | 2014-07-02 | 华南理工大学 | Novel flexible four-jaw chuck |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
-
2016
- 2016-01-15 CN CN201610097374.9A patent/CN105609291A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| 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 |
| CN203679326U (en) * | 2014-01-24 | 2014-07-02 | 华南理工大学 | Novel flexible four-jaw chuck |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160525 |