CN105575597A - Three-phase power zero-sequence current transformer - Google Patents
Three-phase power zero-sequence current transformer Download PDFInfo
- Publication number
- CN105575597A CN105575597A CN201610094082.XA CN201610094082A CN105575597A CN 105575597 A CN105575597 A CN 105575597A CN 201610094082 A CN201610094082 A CN 201610094082A CN 105575597 A CN105575597 A CN 105575597A
- Authority
- CN
- China
- Prior art keywords
- plate portion
- pressing
- core pipe
- paw
- 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.)
- Withdrawn
Links
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
- H01F38/38—Instruments transformers for polyphase ac
-
- 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
- H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device
Abstract
The invention discloses a three-phase power zero-sequence current transformer. The three-phase power zero-sequence current transformer comprises a core tube, a current transformer body, a planar nut, two pressing claw assemblies and six pressing connection parts; six radial limiting sliding holes are formed in the wall of the core tube; each pressing connection part is provided with a pressing plate portion and an anti-falling connection portion; the pressing connection parts are detachably arranged on the core tube through the anti-falling connection portions; each pressing claw assembly comprises three pressing claws; each pressing claw comprises a top plate portion, a guiding sliding block portion and a driving threaded portion; the guiding sliding block portions are inserted into the radial limiting sliding holes, and the driving threaded portions extend into the cavity of the core tube; the planar nut is arranged inside the cavity of the core tube in a rotating mode; the planar nut is provided with planar threaded portions along two side ends in the axial direction of the core tube; the planar threaded portions are matched with the driving threaded portions of all the pressing claws in the corresponding pressing claw assembly in a meshed mode; the current transformer body comprises an annular basic body located on the outer side of each pressing connection part; the planar nut synchronously drives the pressing claws in the two pressing claw assemblies to get close to or get away from the center of the core tube. The three-phase power zero-sequence current transformer has an excellent anti-loosening effect.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of three-phase 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 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 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 firmness, effectively prevent the three-phase power zero sequence current mutual inductor that loosens.
The technical scheme realizing the object of the invention is: a kind of three-phase power zero sequence current mutual inductor, comprises a core pipe, a current transformer, plane nut, two casing pressure claw assemblies and six crimps; The tube wall of core pipe is provided with six spacing slide openings of radial direction; Each crimp is provided with pressing plate portion and anticreep connecting portion; Crimp is arranged on core pipe by anticreep connecting portion is dismountable, and pressing plate portion is positioned at outside core pipe; Each casing pressure claw assembly comprises three paws; Paw comprises top plate portion, from the inwall of top plate portion to the guide runner portion of projecting inward formation and the driving threaded portion that is arranged on guide runner portion; Top plate portion is positioned at outside core pipe, and the pressing plate portion clamping of top plate portion and a corresponding crimp forms one for clamping the clamp hole of electric power cable; Guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, drives threaded portion to stretch in the tube chamber of core pipe; Plane nut rotation is arranged in core pipe tube chamber; Plane nut is respectively provided with a flat thread portion along core tubular axis two side ends upwards; In each flat thread portion and corresponding a set of paw assembly, the driving threaded portion engagement of each paw is adaptive; Current transformer comprises annular matrix, and shape matrix is positioned at the outside of crimp; Radial spacing slide opening all runs through core tube wall along the radial direction of core pipe; Guide runner portion is along core caliber to extension; Each paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of the spacing slide opening of radial direction; The spacing slide opening of each radial direction is just arranged the pressing plate portion of a corresponding crimp; The outer wall of paw top plate portion is provided with arc clip slot; The inwall in pressing plate portion is provided with deep-slotted chip breaker; The periphery wall of plane nut and core inside pipe wall slide adjacent; Plane nut center is provided with fastening part; Fastening part is regular polygon fastener hole or regular polygon binding groove; Crimp is identical with the quantity of paw; Plane nut drives two flat thread portion reciprocating rotations, so synchronous drive paw in two casing pressure claw assemblies towards core tube hub near or away from, thus unclamp or clamp the electric power cable being arranged in 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, and has good anti-loosening effect, and firm intensity is higher and reliable and stable.(2) the present invention compares with by traditional bolt assembly clamping electric power cable, can apply larger pressure, and have excellent anti-loosening effect, effectively ensure the reliability of long-term work.(3) the present invention 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.
Accompanying drawing explanation
Fig. 1 is a kind of perspective view of the present invention;
A kind of front view that Fig. 2 is zero sequence current mutual inductor shown in Fig. 1;
Fig. 3 partly cuts open structural representation for the one of zero sequence current mutual inductor shown in Fig. 1;
Fig. 4 is a kind of perspective view when zero sequence current mutual inductor shown in Fig. 1 removes current transformer;
A kind of front view that Fig. 5 is zero sequence current mutual inductor shown in Fig. 4;
Fig. 6 partly cuts open structural representation for the one of zero sequence current mutual inductor shown in Fig. 4;
A kind of explosive view that Fig. 7 is zero sequence current mutual inductor shown in Fig. 4.
Embodiment
(embodiment 1)
The present embodiment is a kind of three-phase power zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 7, comprises a core pipe 2, two casing pressure claw assembly 3, two cover crimp assemblies, a plane nut 4 and a current transformer.
The tube wall of core pipe is provided with six spacing slide openings 22 of radial direction, and the spacing slide opening of each radial direction all runs through core tube wall along the radial direction of core pipe; The spacing slide opening of each radial direction is positioned at core tubular axis middle part upwards, and the radial cross-sectional shape of each radial spacing hole is I-shaped.In the present embodiment, six radial spacing holes are divided into two groups, and three radial spacing holes in each group are used for and corresponding a set of paw assembly adaptation.
Each cover crimp assemblies is used for and corresponding a set of paw assembly adaptation, and each cover crimp assemblies includes three crimps 1; Each crimp is provided with pressing plate portion 11 and anticreep connecting portion 12; Crimp is arranged on core pipe by anticreep connecting portion is dismountable; Pressing plate portion 11 axially extends along core pipe, and the inwall in pressing plate portion is provided with deep-slotted chip breaker 13, and the periphery wall in pressing plate portion is circular arc; Anticreep connecting portion is that each post plate axially extends along core pipe, and 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 formed; In the present embodiment, two L shape post plates are oppositely arranged.
The periphery wall of core pipe is provided with vertically three for installing the anticreep chute 24 of location crimp; Each anticreep chute runs through core pipe; Each anticreep chute comprises the mounting groove 241 that two radial sections are L shapes; In the present embodiment, two adjacent anticreep chutes are oppositely arranged; Each mounting groove and corresponding post plate adaptation; The anticreep connecting portion of each crimp slips into a corresponding anticreep chute along core pipe axial direction from a side of 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 the mode of clamping that fixing 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 concrete practice, also two crimps axially adjacent along core pipe can be made of one part, then two cover crimp assemblies in the present embodiment just unite two into one and become a set of crimp assemblies.
The spacing slide opening of each radial direction is just arranged the inwall of a corresponding crimp.
Each casing pressure claw assembly comprises for being combined to form three paws 5 in clamp hole with crimp; Each paw comprises top plate portion 51, from the inwall of top plate portion to the guide runner portion 52 of projecting inward formation and the driving threaded portion 53 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 paw top plate portion is provided with arc clip slot 511; Each paw top plate portion is positioned at outside core pipe, and just arranges the pressing plate portion of a corresponding crimp; Each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, and each threaded portion that drives stretches in the tube chamber of core pipe; Each paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of the spacing slide opening of radial direction; The radial cross-sectional shape in each guide runner portion is I-shaped with radial spacing hole adaptation.
In the present embodiment, the arc clip slot of each paw is just arranged the deep-slotted chip breaker of a corresponding crimping boss, and the deep-slotted chip breaker clamping of the arc clip slot of this paw and this crimping boss forms a clamp hole 6, and each clamp hole is for clamping an electric power cable; The present embodiment forms three clamp holes altogether, clamps three electric power cables altogether.Current transformer 8 comprises annular matrix 81 and intelligent control module 82, intelligent control module can comprise wireless transmit/receive units, when there being leakage current in three electric power cables, annular matrix will induce secondary current, and intelligent control module sends distance host by wireless transmit/receive units to this secondary current information; Annular matrix and core pipe are arranged with one heart, and annular matrix is positioned at the outside of crimp; Intelligent control module is arranged on and is enclosed in the region that formed by annular matrix inwall, core tube wall and crimp outer wall, thus makes full use of space, is conducive to overall small-sized and integrated.
Plane nut rotation is arranged in core pipe tube chamber; The periphery wall of plane nut and core inside pipe wall slide adjacent, and plane nut is respectively provided with a flat thread portion 41 along core tubular axis two side ends upwards, and the center of plane nut is provided with fastening part 42; In each flat thread portion and corresponding a set of paw assembly, the driving threaded portion engagement of each paw is adaptive; Driving threaded portion in each casing pressure claw assembly all stretches in core pipe tube chamber, and the driving threaded portion in each casing pressure claw assembly is all connected in a corresponding flat thread portion; Each flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove; The driving threaded portion of each paw assembly is provided with and the thread groove of this archimedean spiral groove adaptation, each side driving threaded portion to be arranged on guide runner portion, place adjacent flat nut.
In the present embodiment, the direction of rotation in the flat thread portion of plane nut one side is forward, and the direction of rotation in the flat thread portion of another side is reverse, the direction of flat thread portion adaptation that the direction of rotation of the driving screw thread on each paw is and adjoins with this paw.When this structure makes plane nut rotation, by two flat thread portions of its two side ends, the synchronous two casing pressure claw assemblies that drive realize clamping or unclamp the cable being arranged in clamp hole.
Current transformer 8 comprises annular matrix 81 and intelligent control module 82, intelligent control module can comprise wireless transmit/receive units, when there being leakage current in three electric power cables, annular matrix will induce secondary current, and intelligent control module sends distance host by wireless transmit/receive units to this secondary current information; Annular matrix and core pipe are arranged with one heart, and annular matrix is positioned at the outside of crimp; Intelligent control module is arranged on and is enclosed in the region that formed by annular matrix inwall, core tube wall and crimp outer wall, thus makes full use of space, is conducive to overall small-sized and integrated.
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 adopts inner hexagon spanner; In concrete practice, described fastening part just can adopt other shape, and such as square or in-line or quincunx, all can select.
In the present embodiment, plane nut is when reciprocating rotation, drive two flat thread portion reciprocating rotation, and then drive each paw in corresponding a set of paw assembly to move by engaging adaptive driving threaded portion to each flat thread portion, because each paw can only move back and forth along the radial direction of core pipe under the guide and limit effect of the spacing slide opening of radial direction, thus make the move mode of paw in each casing pressure claw assembly be close to each other towards core tube hub or away from, thus unclamp or clamp the electric power cable being arranged in each clamp hole.The present embodiment achieves and synchronously drives each paw in two casing pressure claw assemblies to carry out clamping and unclamping the action of cable with a plane nut.
When the present embodiment is on the overhead power line of high-altitude, be conducive to alleviating vibration; In addition, the present embodiment drives paw clamping electric power cable by flat thread portion, compares with by traditional bolt assembly clamping electric power cable, particularly excellent in anti-loosening effect, effectively ensures the reliability of long-term work.In addition, because crimp is arranged on core pipe by sliding or crimping mode, 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.Finally, the present invention, owing to have employed two casing pressure claw assemblies for clamping electric power cable, also has the technique effect of dual fail-safe.
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. a three-phase power zero sequence current mutual inductor, is characterized in that: comprise a core pipe, a current transformer, plane nut, two casing pressure claw assemblies and six crimps; The tube wall of core pipe is provided with six spacing slide openings of radial direction; Each crimp is provided with pressing plate portion and anticreep connecting portion; Crimp is arranged on core pipe by anticreep connecting portion is dismountable, and pressing plate portion is positioned at outside core pipe; Each casing pressure claw assembly comprises three paws; Paw comprises top plate portion, from the inwall of top plate portion to the guide runner portion of projecting inward formation and the driving threaded portion that is arranged on guide runner portion; Top plate portion is positioned at outside core pipe, and the pressing plate portion clamping of top plate portion and a corresponding crimp forms one for clamping the clamp hole of electric power cable; Guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, drives threaded portion to stretch in the tube chamber of core pipe; Plane nut rotation is arranged in core pipe tube chamber; Plane nut is respectively provided with a flat thread portion along core tubular axis two side ends upwards; In each flat thread portion and corresponding a set of paw assembly, the driving threaded portion engagement of each paw is adaptive; Current transformer comprises annular matrix, and shape matrix is positioned at the outside of crimp; Radial spacing slide opening all runs through core tube wall along the radial direction of core pipe; Guide runner portion is along core caliber to extension; Each paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of the spacing slide opening of radial direction; The spacing slide opening of each radial direction is just arranged the pressing plate portion of a corresponding crimp; The outer wall of paw top plate portion is provided with arc clip slot; The inwall in pressing plate portion is provided with deep-slotted chip breaker; The periphery wall of plane nut and core inside pipe wall slide adjacent; Plane nut center is provided with fastening part; Fastening part is regular polygon fastener hole or regular polygon binding groove; Crimp is identical with the quantity of paw; Plane nut drives two flat thread portion reciprocating rotations, so synchronous drive paw in two casing pressure claw assemblies towards core tube hub near or away from, thus unclamp or clamp the electric power cable being arranged in clamp hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610094082.XA CN105575597A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610094082.XA CN105575597A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105575597A true CN105575597A (en) | 2016-05-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610094082.XA Withdrawn CN105575597A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero-sequence current transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN105575597A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2016
- 2016-01-15 CN CN201610094082.XA patent/CN105575597A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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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: 20160511 |