CN105551726A - Zero-sequence current power transformer with relatively good wire clamping fastness - Google Patents
Zero-sequence current power transformer with relatively good wire clamping fastness Download PDFInfo
- Publication number
- CN105551726A CN105551726A CN201610096075.3A CN201610096075A CN105551726A CN 105551726 A CN105551726 A CN 105551726A CN 201610096075 A CN201610096075 A CN 201610096075A CN 105551726 A CN105551726 A CN 105551726A
- Authority
- CN
- China
- Prior art keywords
- tube
- core
- paw
- base tube
- sequence current
- 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- Withdrawn
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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
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- 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
- H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a zero-sequence current power transformer with relatively good wire clamping fastness, comprising a base tube, a core tube, two sets of pressing jaw assemblies, a plane nut and a current transformer; three pressure welding lug bosses are arranged on the inner peripheral wall of the base tube; six radial limiting slide holes are arranged on the tube wall of the core tube; the current transformer is sleeved on the outer wall of the base tube; every set of pressing jaw assembly comprises three pressing jaws; the panel nut is rotationally arranged in the tube cavity of the core tube; a panel thread part is respectively arranged at two sides of the panel nut upward along the radial direction of the core tube; a fastening part is arranged at the center of the plane nut; every panel thread part is in engaged fit with the drive thread part of every pressing jaw in a corresponding set of pressing jaw assembly; the panel nut drives the two panel thread parts to carry out reciprocating rotation so as to synchronously drive every pressing jaw in the two sets of pressing jaw assemblies to be close to or be away from the center of the core tube. The zero-sequence current power transformer has relatively good anti-loose effect.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of zero sequence current mutual inductor with better clamp fastness.
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 zero sequence current mutual inductor with better clamp fastness that loosens.
The technical scheme realizing the object of the invention is: a kind of zero sequence current mutual inductor with better clamp fastness, comprises a base tube, core pipe, two casing pressure claw assemblies, a plane nut and a current transformer; The internal perisporium of base tube is provided with three crimping boss, and the tube wall of core pipe is provided with six spacing slide openings of radial direction; Current transformer is set on base tube outer wall; Each casing pressure claw assembly comprises three paws, and each paw comprises pressing plate portion, from the inwall in pressing plate portion to the guide runner portion of projecting inward formation and the driving threaded portion that is arranged on guide runner portion; Each pressing plate portion is positioned between base tube inwall and core tube wall, and 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 pressing plate portion and the clamping of a corresponding crimping boss form a clamp hole; 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, and the center of plane nut is provided with fastening part; In each flat thread portion and corresponding a set of paw assembly, the driving threaded portion engagement of each paw is adaptive; Plane nut drives two flat thread portion reciprocating rotations, synchronous to drive in two casing pressure claw assemblies each paw towards 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, 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 structural representation of the present invention;
Fig. 2 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. 3 is zero sequence current mutual inductor shown in Fig. 2;
Fig. 4 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. 5 is zero sequence current mutual inductor shown in Fig. 2;
Fig. 6 is a kind of explosive view when shape of zero sequence current mutual inductor shown in Fig. 2 removes base tube.
Embodiment
(embodiment 1)
The present embodiment is a kind of zero sequence current mutual inductor with better clamp fastness, sees shown in Fig. 1 to Fig. 6, comprises a base tube 1, core pipe 2, two casing pressure claw assembly, 3, plane nut 4 and a current transformer.
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 chamber; The periphery wall of core pipe is provided with four along core caliber to protruding the support flange 21 extended, and each outboard end supporting flange is 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 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.
Each casing pressure claw assembly comprises three paws 5; Each paw comprises pressing plate portion 51, from the inwall in pressing 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; Pressing plate portion axially extends along base tube, and guide runner portion is along core caliber to extension; The outer wall in each paw pressing plate portion 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 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.
In the present embodiment, the radial cross-sectional shape of each radial spacing hole is I-shaped, and the radial cross-sectional shape in each guide runner portion is I-shaped with radial spacing hole adaptation; In concrete practice, the radial cross-sectional shape in radial spacing hole and guide runner portion also can select other shape, such as circle, rectangle, square, as long as have radially-directed and limit effect.
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.Because three electric power cables pass from matrix slip pipe tube chamber, current transformer can carry out zero-sequence current detection by induction mode to three electric power cables, for Timeliness coverage leakage current fault, and send real time information to distance host by wireless transmit/receive units, for power circuit intellectuality provides basic data.In the present embodiment, current transformer 8 is ring current transformer, and this ring current transformer is set on base tube outer wall.In concrete practice, also can arrange detent on the outer wall of base tube, current transformer is arranged in this detent, thus makes current transformer more firm.In the present embodiment, the size in each clamp hole can be different, for clamping the cable of different thicknesses.
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.
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 rotations, 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.
The present embodiment gravity centre distribution is comparatively reasonable, when on the overhead power line of high-altitude, is 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, the present embodiment, by adopting two casing pressure claw assembly clampings to same cable, has the effect of dual fail-safe, in use goes wrong even if wherein a set of, also have its service behaviour of another set of guarantee.
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. there is a zero sequence current mutual inductor for better clamp fastness, it is characterized in that: comprise a base tube, core pipe, two casing pressure claw assemblies, a plane nut and a current transformer; The internal perisporium of base tube is provided with three crimping boss, and the tube wall of core pipe is provided with six spacing slide openings of radial direction; Current transformer is set on base tube outer wall; Each casing pressure claw assembly comprises three paws, and each paw comprises pressing plate portion, from the inwall in pressing plate portion to the guide runner portion of projecting inward formation and the driving threaded portion that is arranged on guide runner portion; Each pressing plate portion is positioned between base tube inwall and core tube wall, and 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 pressing plate portion and the clamping of a corresponding crimping boss form a clamp hole; 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, and the center of plane nut is provided with fastening part; In each flat thread portion and corresponding a set of paw assembly, the driving threaded portion engagement of each paw is adaptive; Plane nut drives two flat thread portion reciprocating rotations, synchronous to drive in two casing pressure claw assemblies each paw towards core tube hub close to each other or away from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096075.3A CN105551726A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current power transformer with relatively good wire clamping fastness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096075.3A CN105551726A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current power transformer with relatively good wire clamping fastness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105551726A true CN105551726A (en) | 2016-05-04 |
Family
ID=55830856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610096075.3A Withdrawn CN105551726A (en) | 2016-01-15 | 2016-01-15 | Zero-sequence current power transformer with relatively good wire clamping fastness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105551726A (en) |
Citations (3)
| 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 |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
-
2016
- 2016-01-15 CN CN201610096075.3A patent/CN105551726A/en not_active Withdrawn
Patent Citations (3)
| 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 |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20160504 |