CN105609298A - Improved middle- and high-voltage zero sequence current transformer - Google Patents
Improved middle- and high-voltage zero sequence current transformer Download PDFInfo
- Publication number
- CN105609298A CN105609298A CN201610099049.6A CN201610099049A CN105609298A CN 105609298 A CN105609298 A CN 105609298A CN 201610099049 A CN201610099049 A CN 201610099049A CN 105609298 A CN105609298 A CN 105609298A
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- CN
- China
- Prior art keywords
- tube
- core pipe
- base tube
- crimping
- 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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Classifications
-
- 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)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses an improved middle- and high-voltage zero sequence current transformer. The improved middle- and high-voltage zero sequence current transformer comprises a base tube, a core tube, two crimping elements and two sets of press claw assemblies, wherein a plurality of wire clamping bosses are arranged on the inner peripheral wall of the base tube, two groups of guide holes are formed on the tube wall of the core tube, each group of guide hole comprises a plurality of radial limiting sliding holes, two internal thread regions are arranged on the inner wall of the core tube, each set of press claw assembly comprises a plurality of press claws, each press claw comprises a press plate part, a guide sliding block part and a driving surface, each crimping element comprises a body, an external thread region arranged on the outer peripheral wall of the body and a crimping boss, the crimping boss is arranged on the inner side end of the cylindrical body, the external thread regions of the crimping elements are adaptive to the internal thread regions of the core tube, the driving surface of each press claw is adaptive to the outer peripheral wall of each crimping boss, and the press plate part in the corresponding one set of the press claw assembly is pushed to outwards move along the radial direction of the core tube when each crimping element rotates along a predetermined direction. The improved middle- and high-voltage zero sequence current transformer has excellent performance.
Description
Technical field
The invention belongs to power technology field, be specifically related to a kind of modified mesohigh 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 take phase according to electrical leakage quantityThe protection action of answering.
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 the application of zero sequence current mutual inductor be subject to more restriction.
Summary of the invention
The object of this invention is to provide a kind of modified mesohigh zero sequence electricity of locating, thering is better firm degree of being convenient to installCurrent transformer.
The technical scheme that realizes the object of the invention is: a kind of modified mesohigh zero sequence current mutual inductor, comprise a base tube,Core pipe, two crimps and two casing pressure claw assemblies; The internal perisporium of base tube is provided with multiple clamp boss; Core pipe is positioned at baseIn pipe tube chamber; The tube wall of core pipe is provided with two groups of pilot holes, respectively organizes pilot hole and comprises multiple radially spacing slide openings; Core pipeInwall is provided with two internal threaded regions; Each casing pressure claw assembly includes multiple paws; Each paw comprises pressing plate portion, from pressing platePortion protrudes the guide runner portion forming and is arranged on the drive surface in guide runner portion; Each guide runner insertion core Guan Shangxiang of portionAnswer in a radially spacing slide opening, each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned at base tube inwall and core pipeBetween outer wall; The pressing plate portion of each paw and a corresponding clamp boss clamping form one for clamping the clamp of electric power cableHole; Each crimp comprises body, is arranged on the external screw thread district on body periphery wall and is arranged on cylindrical body medial extremityCrimping boss, the external screw thread district of crimp and the internal threaded regions adaptation of core pipe; Outside the drive surface of each paw and crimping bossPerisporium adaptation; The internal perisporium of base tube is axially also provided with multiple positioning runners along base tube; The periphery wall of core pipe is provided with multiple edgesBase tube radially protrudes the support flange of extension, and the outboard end that respectively supports flange is arranged in a corresponding positioning runner, therebyCore pipe supporting and location is in the tube chamber of base tube; Each radially spacing slide opening is positioned at core tubular axis middle part upwards, respectively radially spacing cunningThe cross sectional shape in hole is I-shaped; The cross sectional shape of each guide runner portion is I-shaped with radially spacing slide opening adaptation; RespectivelyRadially spacing slide opening all radially runs through core tube wall along base tube; When each crimp rotates along preset direction, drive crimping protrudingPlatform rotates while advances in core pipe tube chamber, and crimping boss is by the drive surface in the corresponding a set of paw assembly of pushingPromote each paw, the pressing plate portion in corresponding a set of paw assembly is radially outward moved along core pipe, be positioned at folder thereby clampElectric power cable in line hole.
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. (2) crimp is connected threadably with core pipe, and pushes away by crimping bossPress the drive surface of each paw, and then promote each paw and move along core pipe radial direction; Its operation is comparatively laborsaving, and hasGood anti-loosening effect. (3) the present invention adopts two casing pressure claw assemblies to be clamped on same cable, each casing pressure claw assemblyClamp operation can be carried out separately, and this structure has the effect of double shield, even if wherein a set of in use appearance asksTopic, also has its service behaviour of another set of guarantee.
Brief description of the drawings
Fig. 1 is that the one of the first structure of the present invention is partly cutd open schematic diagram;
Fig. 2 is that zero sequence current mutual inductor shown in Fig. 1 removes a kind of perspective view after current transformer;
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 that zero sequence current mutual inductor shown in Fig. 2 removes a kind of explosive view after base tube and crimp;
Fig. 7 is that the one of the second structure of the present invention is partly cutd open structural representation;
Fig. 8 is a kind of structural representation of zero sequence current mutual inductor shown in Fig. 7.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of modified mesohigh zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 6, comprises a base tube1, core pipe 2, current transformer 7, two crimps 3 and two casing pressure claw assemblies 8.
In the present embodiment, base tube, core pipe 2, two crimps 3 and two casing pressure claw assemblies 8 all adopt insulating materials to make.
The internal perisporium of base tube is provided with four clamp boss 11, and the inwall of each clamp boss is provided with deep-slotted chip breaker 111, and each clamp is protrudingPlatform and deep-slotted chip breaker all extend axially along base tube. The internal perisporium of base tube is axially also provided with multiple positioning runners 12 along base tube.
Core pipe and base tube arrange with one heart, and core pipe is arranged in base tube tube chamber; The periphery wall of core pipe is provided with four along base tube radiallyProtrude the support flange 21 extending, the outboard end that respectively supports flange is arranged in a corresponding positioning runner, thereby core pipe is propped upSupport is positioned in the tube chamber of base tube; The tube wall of core pipe is provided with two groups of pilot holes, respectively organizes pilot hole and a set of paw assembly suitableJoin; Each group pilot hole comprises four radially spacing slide openings 22, and these four radially spacing slide openings are circumferentially evenly distributed on along core pipeOn core tube wall; Each radially spacing slide opening all radially runs through core tube wall along base tube; Respectively radially spacing slide opening is positioned at core pipeMiddle part axially, each radially cross sectional shape of spacing slide opening is I-shaped. The inwall of core pipe is provided with two internal threaded regions23, two groups of pilot holes are between two internal threaded regions; In the present embodiment, two internal threaded regions are arranged on core pipe two side endsOn the inwall at adjacent openings place.
In concrete practice, the cross sectional shape of guiding slide opening also can adopt other shape, for example circular, square, rhombus,All feasible.
Each casing pressure claw assembly 8 comprises four paws 4; Each paw comprises pressing plate portion 41, from the inwall of pressing plate portion to projecting inwardThe guide runner portion 42 forming and be arranged on the drive surface 43 in guide runner portion; Pressing plate portion extends axially along base tube, leadsRadially extend along base tube to slide section; The outer wall of each paw pressing plate portion is provided with arc clip slot 411; Each guide runner portion insertsEnter on core pipe in a corresponding radially spacing slide opening, each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned at base tubeBetween inwall and core tube wall; Each paw radially back and forth sliding along base tube under the guide and limit effect of spacing slide opening radiallyMoving; The cross sectional shape of each guide runner portion is I-shaped with radially spacing slide opening adaptation.
A corresponding clamp boss clamping on each pressing plate portion and base tube forms one for clamping the clamp hole of electric power cable5; In the present embodiment, the arc clip slot of each pressing plate portion and the deep-slotted chip breaker clamping of a corresponding clamp boss are formed for clampingThe clamp hole 5 of electric power cable; The present embodiment forms four clamp holes altogether.
Each crimp 3 comprises cylindrical body 31, be arranged on external screw thread district 32 on cylindrical body periphery wall, be arranged on postThe fastening part 33 of shape body outboard end and be arranged on the crimping boss 34 on cylindrical body medial extremity, the shape of crimping bossFor circular cone shape; The external screw thread district of each crimp and the internal threaded regions adaptation of core pipe; Crimping boss extends axially along base tube,And be arranged in core pipe tube chamber.
In the present embodiment, the drive surface of each paw is the curved surface of and crimping boss periphery wall adaptation, in concrete practice,This drive surface also can be selected inclined-plane.
In the present embodiment, in each casing pressure claw assembly, the quantity of paw is identical with the quantity of the slide opening that leads in each group of pilot hole, and extremelyFew three. .
Current transformer 7 comprises toroidal inductive body 71 and intelligent control module 72; In the present embodiment, Based Intelligent Control mouldPiece 72 is made with toroidal inductive body has onesize vestibule, and annular perception induction body and intelligent control module are side by sideSetting is combined to form annular, on the sheathed periphery wall that is fixed on base tube of current transformer entirety. In concrete practice, electric currentTransformer also can be fixedly installed on the tube wall of core pipe, as long as make all clamps hole be arranged in the vestibule of toroidal inductive body, also only need to make cable pass the vestibule of toroidal inductive body.
Intelligent control module can comprise wireless transmit/receive units, intelligent control module by wireless transmit/receive units annular base tubeThe leakage current signal sensing sends distance host to, to realize accurate long-range no worker monitor, finds in time electric leakage eventBarrier.
The present embodiment, in order to promote chuck strength, is also provided with multiple punctures 6 in each deep-slotted chip breaker and arc clip slot; Concrete nextSay, each puncture is along the radially protrusion of core pipe portion.
In the present embodiment, each paw is the integral piece of making by injection mo(u)lding, and each puncture is made in the time of injection mo(u)lding; ?In concrete practice, puncture also can adopt alternate manner to make; For example in each deep-slotted chip breaker, be provided with multiple installation draw-in grooves, thenThe puncture sheet that adopts insulating materials to make is inlaid in to corresponding one to be installed in draw-in groove; Puncture sheet comprises installation portion and thorn swordPortion, installation portion is inlaid in to be installed in draw-in groove, and thorn blade exposes installing card groove and forms puncture. In concrete practice, also canTo adopt in the mode that screw thread is set in each arc clip slot and deep-slotted chip breaker, also can improving clamping sigma compactness energy.
When each crimp rotates along preset direction, drive crimping boss rotates while advances in core pipe tube chamber, eachCrimping boss promotes paw by the drive surface in the corresponding a set of paw assembly of pushing, makes in corresponding a set of paw assemblyEach pressing plate portion radially outward moves along core pipe, thereby clamps the electric power cable that is arranged in each clamp hole.
The present embodiment has following useful technique effect: (1) crimp is connected threadably with core pipe, and by crimpingBoss pushes the drive surface of each paw, and then promotes each paw and move along core pipe radial direction; Its operation is comparatively laborsaving,And there is good anti-loosening effect. (2) the present invention adopts two casing pressure claw assemblies to be clamped on same cable, respectively overlaps pawThe clamp operation of assembly can be carried out separately, and this structure has the effect of double shield, even wherein in use a set ofGo wrong, also have its service behaviour of another set of guarantee.
(embodiment 2)
The present embodiment and embodiment 1 are basic identical, and difference is: see shown in Fig. 7 to Fig. 8, and in the present embodiment,On the sheathed periphery wall that is fixed on base tube of annular perception induction body; The periphery wall of base tube is provided with and radially runs through tube wallRouting hole 13; Between base tube inwall, core tube wall, clamp boss, support flange, paw pressing plate portion, clamping forms multipleAccommodating cavity 73, intelligent control module is arranged in accommodating cavity; Electrical connection between toroidal inductive body and intelligent control moduleLine is through described routing hole. This structure can make full use of space, is conducive to the small-sized and integrated of entirety.
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. a modified mesohigh zero sequence current mutual inductor, is characterized in that: comprise a base tube, core pipe,Two crimps and two casing pressure claw assemblies; The internal perisporium of base tube is provided with multiple clamp boss; Core pipe is arranged in base tube tube chamber;The tube wall of core pipe is provided with two groups of pilot holes, respectively organizes pilot hole and comprises multiple radially spacing slide openings; The inwall of core pipe is provided withTwo internal threaded regions; Each casing pressure claw assembly includes multiple paws; Each paw comprises pressing plate portion, protrudes and form from pressing plate portionGuide runner portion and be arranged on the drive surface in guide runner portion; Each guide runner portion insert on core pipe corresponding one radiallyIn spacing slide opening, each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned between base tube inwall and core tube wall;The pressing plate portion of each paw and a corresponding clamp boss clamping form one for clamping the clamp hole of electric power cable; Each crimpingPart comprises body, is arranged on the external screw thread district on body periphery wall and is arranged on the crimping boss on cylindrical body medial extremity,The external screw thread district of crimp and the internal threaded regions adaptation of core pipe; The periphery wall adaptation of the drive surface of each paw and crimping boss;The internal perisporium of base tube is axially also provided with multiple positioning runners along base tube; The periphery wall of core pipe is provided with multiple along base tube radial convexThe support flange that goes out to extend, the outboard end that respectively supports flange is arranged in a corresponding positioning runner, thereby core pipe is supported and determinedPosition is in the tube chamber of base tube; Each radially spacing slide opening is positioned at core tubular axis middle part upwards, each radially cross section shape of spacing slide openingShape is I-shaped; The cross sectional shape of each guide runner portion is I-shaped with radially spacing slide opening adaptation; Respectively radially spacing cunningKong Jun radially runs through core tube wall along base tube; When each crimp rotates along preset direction, drive crimping boss to rotate on one sideIn core pipe tube chamber, advance on one side, crimping boss promotes each pressure by the drive surface pushing in corresponding a set of paw assemblyPawl, makes the pressing plate portion in corresponding a set of paw assembly radially outward move along core pipe, thereby clamping is arranged in clamp holeElectric power cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099049.6A CN105609298A (en) | 2016-01-15 | 2016-01-15 | Improved middle- and high-voltage zero sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099049.6A CN105609298A (en) | 2016-01-15 | 2016-01-15 | Improved middle- and high-voltage zero sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105609298A true CN105609298A (en) | 2016-05-25 |
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ID=55989146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610099049.6A Withdrawn CN105609298A (en) | 2016-01-15 | 2016-01-15 | Improved middle- and high-voltage zero sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105609298A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5869785A (en) * | 1997-06-10 | 1999-02-09 | Antec Corporation | Wire clamp with parallel gripping action |
| CN102354940A (en) * | 2011-10-29 | 2012-02-15 | 浙江左易电力设备有限公司 | Wedge-shape strain clamp of bunched cable |
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
-
2016
- 2016-01-15 CN CN201610099049.6A patent/CN105609298A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5869785A (en) * | 1997-06-10 | 1999-02-09 | Antec Corporation | Wire clamp with parallel gripping action |
| CN102354940A (en) * | 2011-10-29 | 2012-02-15 | 浙江左易电力设备有限公司 | Wedge-shape strain clamp of bunched cable |
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160525 |
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| WW01 | Invention patent application withdrawn after publication |