CN105551757A - Power zero-sequence current transformer for preventing cable from loosening - Google Patents
Power zero-sequence current transformer for preventing cable from loosening Download PDFInfo
- Publication number
- CN105551757A CN105551757A CN201610098542.6A CN201610098542A CN105551757A CN 105551757 A CN105551757 A CN 105551757A CN 201610098542 A CN201610098542 A CN 201610098542A CN 105551757 A CN105551757 A CN 105551757A
- Authority
- CN
- China
- Prior art keywords
- core pipe
- paw
- radially
- plate portion
- core
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
- F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two or more members engaging the pipe, cable or protective tubing
-
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/04—Arrangements or devices for relieving mechanical tension
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a power zero-sequence current transformer for preventing a cable from loosening. The power zero-sequence current transformer comprises a jacking and pressing bolt, a core tube, a current transformer body, a crimping assembly and a press claw assembly, wherein radial guide slide holes are formed in the tube wall of the core tube; an inner thread region is arranged in a tube cavity of the core tube; the crimping assembly comprises a plurality of crimping parts; each crimping part is provided with a press plate part and an anti-drop connection part; the crimping parts are detachably arranged on the core tube through the anti-drop connection parts; the press claw assembly comprises a plurality of press claws; each press claw comprises a top plate part, a guide slide block part and a drive surface; each guide slide block part is inserted into one corresponding radial guide slide hole; the jacking and pressing bolt comprises a body, an outer thread region and a jacking and pressing boss; the shape of the jacking and pressing boss is a truncated cone shape; the outer thread region of the jacking and pressing bolt is matched with the inner thread region of the core tube; the drive surface of each press claw is matched with the outer circumference wall of one corresponding jacking and pressing boss; and the jacking and pressing bolt pushes the top plate parts to move outwards along the radial direction of the core tube when rotating along the preset direction. The power zero-sequence current transformer is firm, stable and reliable to install.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of electric power zero sequence current mutual inductor preventing cable from getting loose.
Background technology
The general principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): the algebraical sum flowing into the telegram in reply stream of any node in circuit equals zero.Under circuit and the normal situation of electric equipment, the vector of each phase current equals zero, and therefore, the secondary side winding no signal of zero sequence current mutual inductor exports, and executive component is failure to actuate.The vector of each phase current when there is electric shock or leak current fault is non-vanishing, and fault current makes to produce magnetic flux in the iron core of zero sequence current mutual inductor, and the electric current that zero sequence current mutual inductor produces 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 generally needs to reserve, therefore makes 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 electric power zero sequence current mutual inductor preventing cable from getting loose being convenient to install location, there is better firmness.
The technical scheme realizing the object of the invention is: a kind of electric power zero sequence current mutual inductor preventing cable from getting loose, and comprises a top pressure bolt, a core pipe, current transformer, a set of crimp assemblies and an a set of paw assembly; The tube wall of core pipe is provided with one group of pilot hole, and this group pilot hole comprises at least three radially-directed slide openings; Internal threaded regions is provided with in core pipe tube chamber; Crimp assemblies comprises at least three crimps; Each crimp is provided with pressing plate portion and anticreep connecting portion; Crimp is arranged on core pipe by anticreep connecting portion is dismountable; Paw assembly comprises at least three paws; Each paw comprises top plate portion, from the inwall of top plate portion to the guide runner portion of projecting inward formation and the drive surface that is arranged on guide runner portion; Each guide runner portion inserts on core pipe in a corresponding radially-directed slide opening, and each drive surface stretches in the tube chamber of core pipe, and each top plate portion is between core inside pipe wall and core tube wall; The top plate portion of each paw is just arranged a corresponding crimp pressing plate portion, and this top plate portion and this pressing plate portion clamping form one for clamping the clamp hole of electric power cable; Crimp assemblies and paw assembly form at least three clamp holes altogether; Current transformer comprises toroidal inductive body; Each clamp hole is all arranged in the vestibule of toroidal inductive body; Top pressure bolt comprises body, is arranged on the external screw thread district on body peripheral wall and is arranged on the top belling platform on body medial extremity, and the shape of top belling platform is circular cone shape; The external screw thread district of top pressure bolt and the internal threaded regions adaptation of core pipe; Drive surface and a corresponding top belling platform periphery wall of each paw are adaptive; The guide runner portion of each paw is along core caliber to extension; The cross sectional shape of each radially-directed slide opening is I-shaped; The cross sectional shape in each guide runner portion is I-shaped with radially-directed slide opening adaptation; Multiple radially-directed slide opening is evenly distributed on core tube wall along core pipe circumference; Each radially-directed slide opening all runs through core tube wall along the radial direction of core pipe; Each radially-directed slide opening is just arranged the inwall of a corresponding crimp; The radial direction of each paw along core pipe under the guide and limit effect of radially-directed slide opening reciprocatingly slides; When top pressure bolt rotates along preset direction, top belling platform is driven to rotate while advance in core pipe tube chamber, top belling platform promotes each paw by the top each drive surface of pressure, each top plate portion is radially outward moved along core pipe, thus clamping is arranged in the electric power cable in each clamp hole.
The present invention has positive effect: (1) zero sequence current mutual inductor of the present invention, owing to carrying press claw type retaining mechanism, does not need reserved installation position, is easy to install.(2) crimp is connected threadably with base tube, and crimps each paw by taper electrolysis and make it clamp electric power cable, and its operation is comparatively laborsaving, and has good anti-loosening effect.
Accompanying drawing explanation
Fig. 1 is that the one of the first structure of the present invention partly cuts open schematic diagram;
Fig. 2 removes a kind of perspective view after current transformer for zero sequence current mutual inductor shown in figure;
Fig. 3 is for zero sequence current mutual inductor shown in Fig. 2 is from a kind of perspective view during another angle views;
Fig. 4 faces structural representation for the one of zero sequence current mutual inductor shown in Fig. 2;
Fig. 5 partly cuts open structural representation for the one of zero sequence current mutual inductor shown in Fig. 2;
A kind of explosive view that Fig. 6 is zero sequence current mutual inductor shown in Fig. 2;
Fig. 7 is for zero sequence current mutual inductor shown in Fig. 2 is from a kind of explosive view during another angle views;
Fig. 8 removes crimp for zero sequence current mutual inductor shown in Fig. 2 and a kind of explosive view after bolt is pressed on top;
Fig. 9 is that the one of the second structure of the present invention partly cuts open structural representation;
A kind of structural representation that Figure 10 is zero sequence current mutual inductor shown in Fig. 9.
Embodiment
(embodiment 1)
The present embodiment is a kind of electric power zero sequence current mutual inductor preventing cable from getting loose, and sees shown in Fig. 1 to Fig. 8, comprises a top pressure bolt 1, core pipe 2, a set of crimp assemblies 3, current transformer 7 and a set of paw assembly 8.
In the present embodiment, core pipe 2, crimp assemblies 3 and paw assembly 8 all adopt insulating material to make.
The tube wall of core pipe is provided with one group of pilot hole, and this group pilot hole comprises four radially-directed slide openings 22, and these four radially-directed slide openings are evenly distributed on core tube wall along core pipe circumference; Each radially-directed slide opening all runs through core tube wall along the radial direction of core pipe; Each radially-directed slide opening is positioned at core tubular axis middle part upwards, and the cross sectional shape of each radially-directed slide opening is I-shaped.Internal threaded regions 23 is provided with in core pipe tube chamber.
Crimp assemblies 3 comprises four crimps 31; Each crimp is provided with pressing plate portion 311 and anticreep connecting portion 312; Crimp is arranged on core pipe by anticreep connecting portion is dismountable; Pressing plate portion axially extends along core pipe, and the inwall in pressing plate portion is provided with deep-slotted chip breaker 313, and the periphery wall in pressing plate portion is circular arc; Anticreep connecting portion is that the radial cross-sectional shape of each post plate is L shape from pressing plate portion two side ends inwardly outstanding two the post plates 314 formed; In the present embodiment, two L shape post plates are oppositely arranged.
Each radially-directed slide opening is just arranged the inwall of a corresponding crimp.
The periphery wall of core pipe is provided with vertically four groups for installing the anticreep chute 21 of location crimp; Each group of anticreep chute comprises the axial slide 211 that two radial sections are L shapes; In the present embodiment, two adjacent axial slides are oppositely arranged; Each axial slide and corresponding post plate adaptation; The anticreep connecting portion of each crimp slips into along core pipe axial direction from a side of corresponding one group of anticreep chute this group anticreep chute; In concrete practice, anticreep connecting portion can select other shape, as long as make the anticreep connecting portion of crimp can not shift out along core caliber to from anticreep chute; In concrete practice, also can select snap fit that fixing each crimp is installed; Such as multiple draw-in groove is set on the periphery wall of core pipe, each pressing plate arranges inwardly outstanding clamping support column or clamping supporting bracket, each clamping support column or clamping supporting bracket are directly snapped in a corresponding draw-in groove, also can prevent shackle member from shifting out core pipe along core pipe radial direction, this structure is also feasible.
In the present embodiment, crimp is identical with the quantity of paw.
In concrete practice, the cross sectional shape of radially-directed slide opening also can adopt other shape, such as circular, square, rhombus, is all feasible.
Paw assembly 8 comprises four paws 4; Each paw comprises top plate portion 41, from the inwall of top plate portion to the guide runner portion 42 of projecting inward formation and the drive surface 43 that is arranged on guide runner portion; Top plate portion axially extends along core pipe, and guide runner portion is along core caliber to extension; The outer wall of each paw top plate portion is provided with arc clip slot 411; Each guide runner portion inserts on core pipe in a corresponding radially-directed slide opening, and each drive surface stretches in the tube chamber of core pipe, and each top plate portion is between core inside pipe wall and core tube wall; The radial direction of each paw along core pipe under the guide and limit effect of radially-directed slide opening reciprocatingly slides; The cross sectional shape in each guide runner portion is I-shaped with radially-directed slide opening adaptation.
The arc clip slot of each paw top plate portion is just arranged the deep-slotted chip breaker in a corresponding crimp pressing plate portion, and this arc clip slot and this deep-slotted chip breaker clamping form a clamp hole 5, and each clamp hole is for clamping an electric power cable.In concrete practice, the size of each crimp can be different, and such as, distance between the deep-slotted chip breaker in each pressing plate portion and core tube wall is different, thus can form the clamp hole varied in size, for clamping the cable of different thicknesses.
The present embodiment forms four clamp holes altogether, can clamp four electric power cables; But when using as zero sequence current mutual inductor, a gripping three phase line cables.In concrete practice, also the present embodiment can be made the structure only with three clamp holes.
Top pressure bolt 1 comprises body 11, the external screw thread district 12 be arranged on body peripheral wall, the fastening part 13 being arranged on body outboard end and the top belling platform 14 be arranged on body medial extremity, the shape of top belling platform is circular cone shape; The external screw thread district of top pressure bolt and the internal threaded regions adaptation of core pipe; Top belling platform extends along the axis of core pipe, and is arranged in core pipe tube chamber.
In the present embodiment, the drive surface of each paw is the curved surface of and top belling platform periphery wall adaptation, especially has the curved surface of tapering; In concrete practice, this drive surface also can select flat bevel.
In the present embodiment, in paw assembly, the quantity of paw is identical with the quantity of radially-directed slide opening in each group of pilot hole, and at least three.
Current transformer comprises toroidal inductive body 71 and intelligent control module 72; In the present embodiment, intelligent control module 72 makes the ring-type with toroidal inductive body with onesize vestibule, annular perception induction body and intelligent control module are arranged side by side and are combined to form annular, on the overall sheathed outer wall being fixed on each pressing plate portion of current transformer, also namely crimp assemblies is arranged in the vestibule of current transformer entirety.In concrete practice, current transformer also can be fixedly installed on the tube wall of core pipe, as long as make all clamp holes be arranged in the vestibule of toroidal inductive body, also namely only needs to make cable pass the vestibule of toroidal inductive body.
Intelligent control module can comprise wireless transmit/receive units, and intelligent control module sends distance host by wireless transmit/receive units to the leakage current signal that toroidal inductive body senses, to realize accurate long-range no worker monitor, Timeliness coverage leak current fault.The present embodiment can use as a zero sequence current mutual inductor.
The present embodiment, in order to promote chuck strength, is also provided with multiple puncture 6 in each deep-slotted chip breaker and arc clip slot; Specifically, each puncture is protruded along the radial direction in core pipe portion.
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 also can adopt alternate manner to make; Such as in each deep-slotted chip breaker, be provided with multiple installation draw-in groove, then the puncture sheet adopting insulating material to make be inlaid in corresponding one and install in draw-in groove; Puncture sheet comprises installation portion and thorn blade, and installation portion is inlaid in be installed in draw-in groove, and thorn blade then exposes installing card groove and forms puncture.In concrete practice, can also adopt in the mode arranging screw thread in each arc clip slot and deep-slotted chip breaker, also can improving clamping sigma compactness energy.
When top pressure bolt rotates along preset direction, top belling platform is driven to rotate while advance in core pipe tube chamber, top belling platform promotes each paw by the top each drive surface of pressure, each top plate portion is radially outward moved along core pipe, thus clamping is arranged in the electric power cable in each clamp hole.
The present embodiment has following Advantageous Effects: (1) top pressure bolt is connected threadably with core pipe, and pushes the drive surface of each paw by pushing up belling platform, and then promotes each paw and move along core pipe radial direction; Its operation is comparatively laborsaving, and has good anti-loosening effect.(2) because crimp is arranged on core pipe by sliding, first cable can be placed in the arc clip slot of each paw, more corresponding crimp is loaded in corresponding anticreep chute, corresponding electric power cable can be placed in clamp hole; This structure makes to clamp the easy to operation of electric power cable.
(embodiment 2)
The present embodiment is substantially identical with embodiment 1, and difference is: see shown in Fig. 9 to Figure 10, in the present embodiment, on the sheathed periphery wall being fixed on pressing plate portion of annular perception induction body; Core tube wall, between crimp outer wall and toroidal inductive inner body wall clamping form multiple containing cavity 73, intelligent control module is arranged in containing cavity.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 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 exhaustive without the need to also giving all execution modes.And these belong to connotation of the present invention the apparent change of extending out or variation still belong to protection scope of the present invention.
Claims (1)
1. prevent the electric power zero sequence current mutual inductor that cable gets loose, it is characterized in that: comprise a top pressure bolt, a core pipe, current transformer, a set of crimp assemblies and an a set of paw assembly; The tube wall of core pipe is provided with one group of pilot hole, and this group pilot hole comprises at least three radially-directed slide openings; Internal threaded regions is provided with in core pipe tube chamber; Crimp assemblies comprises at least three crimps; Each crimp is provided with pressing plate portion and anticreep connecting portion; Crimp is arranged on core pipe by anticreep connecting portion is dismountable; Paw assembly comprises at least three paws; Each paw comprises top plate portion, from the inwall of top plate portion to the guide runner portion of projecting inward formation and the drive surface that is arranged on guide runner portion; Each guide runner portion inserts on core pipe in a corresponding radially-directed slide opening, and each drive surface stretches in the tube chamber of core pipe, and each top plate portion is between core inside pipe wall and core tube wall; The top plate portion of each paw is just arranged a corresponding crimp pressing plate portion, and this top plate portion and this pressing plate portion clamping form one for clamping the clamp hole of electric power cable; Crimp assemblies and paw assembly form at least three clamp holes altogether; Current transformer comprises toroidal inductive body; Each clamp hole is all arranged in the vestibule of toroidal inductive body; Top pressure bolt comprises body, is arranged on the external screw thread district on body peripheral wall and is arranged on the top belling platform on body medial extremity, and the shape of top belling platform is circular cone shape; The external screw thread district of top pressure bolt and the internal threaded regions adaptation of core pipe; Drive surface and a corresponding top belling platform periphery wall of each paw are adaptive; The guide runner portion of each paw is along core caliber to extension; The cross sectional shape of each radially-directed slide opening is I-shaped; The cross sectional shape in each guide runner portion is I-shaped with radially-directed slide opening adaptation; Multiple radially-directed slide opening is evenly distributed on core tube wall along core pipe circumference; Each radially-directed slide opening all runs through core tube wall along the radial direction of core pipe; Each radially-directed slide opening is just arranged the inwall of a corresponding crimp; The radial direction of each paw along core pipe under the guide and limit effect of radially-directed slide opening reciprocatingly slides; When top pressure bolt rotates along preset direction, top belling platform is driven to rotate while advance in core pipe tube chamber, top belling platform promotes each paw by the top each drive surface of pressure, each top plate portion is radially outward moved along core pipe, thus clamping is arranged in the electric power cable in each clamp hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610098542.6A CN105551757A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer for preventing cable from loosening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610098542.6A CN105551757A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer for preventing cable from loosening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105551757A true CN105551757A (en) | 2016-05-04 |
Family
ID=55830887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610098542.6A Withdrawn CN105551757A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer for preventing cable from loosening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105551757A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991388A (en) * | 2021-11-19 | 2022-01-28 | 中国船舶重工集团公司第七0七研究所 | Semi-automatic wire crimping device |
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 CN201610098542.6A patent/CN105551757A/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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991388A (en) * | 2021-11-19 | 2022-01-28 | 中国船舶重工集团公司第七0七研究所 | Semi-automatic wire crimping device |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160504 |
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| WW01 | Invention patent application withdrawn after publication |