CN105845366A - High-voltage zero-sequence current transformer with relatively good wire clamping fastness - Google Patents
High-voltage zero-sequence current transformer with relatively good wire clamping fastness Download PDFInfo
- Publication number
- CN105845366A CN105845366A CN201610288714.6A CN201610288714A CN105845366A CN 105845366 A CN105845366 A CN 105845366A CN 201610288714 A CN201610288714 A CN 201610288714A CN 105845366 A CN105845366 A CN 105845366A
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- China
- Prior art keywords
- paw
- tube
- current transformer
- core
- base tube
- 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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- 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
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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 high-voltage zero-sequence current transformer with relatively good wire clamping fastness. The high-voltage zero-sequence current transformer comprises a base tube, a core tube, two sets of press claw components, a flat nut and a current transformer body, wherein three crimping bosses are formed on the inner circumference wall of the base tube; six radial limiting slide holes are formed in the tube wall of the core tube; the current transformer body sleeves the outer wall of the base tube; each set of press claw components comprise three press claws; the flat nut is rotationally arranged in the tube cavity of the core tube; two side ends, along the axial direction of the core tube, of the flat nut are provided with plane thread parts respectively; a fastening part is arranged at the center of the flat nut; each plane thread part is meshed and matched with the drive thread parts of the press claws in one corresponding set of press claw components; and a mounting screw hole with a built-in temperature sensing device is formed in the base tube. The high-voltage zero-sequence current transformer has a relatively good anti-looseness effect.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of high pressure zero sequence current mutual inductance with preferable clamp fastness
Device.
Background technology
The ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flow into the telegram in reply of any node in circuit
The algebraical sum of stream is equal to zero.In the case of circuit and electrical equipment are normal, the vector of each phase current is equal to zero, therefore, zero
The secondary side winding no signal output of sequence current transformer, executive component is failure to actuate.When occurring to get an electric shock or each during leak current fault
The vector of phase current is not zero, and fault current makes to produce in the iron core of zero sequence current mutual inductor magnetic flux, zero sequence current mutual inductor
Produced electric current is zero-sequence current.When protection mechanism receives this zero sequence current signal, can take accordingly according to electrical leakage quantity
Protection act.Mostly the mounting means of existing zero sequence current mutual inductor is to use flange install fixing or use bonding mode solid
Fixed, its installation site is it is generally required to reserve, therefore makes its application by more restriction.
Summary of the invention
It is an object of the invention to provide a kind of be easily installed location, there is real time temperature control function there is preferable clamp
The high pressure zero sequence current mutual inductor of fastness.
The technical scheme realizing the object of the invention is: a kind of high pressure zero sequence current mutual inductor with preferable clamp fastness,
It is characterized in that: include a base tube, core pipe, two casing pressure claw assemblies, a plane nut and a current transformer；Base
The internal perisporium of pipe 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 in
On base tube outer wall；Each casing pressure claw assembly includes three paws, and each paw includes pressing plate portion, the inwardly projecting shape of inwall from pressing plate portion
The guide runner portion become and the driving threaded portion being arranged in guide runner portion；Each pressing plate portion is positioned at base tube inwall and core tube wall
Between, each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, each pipe driving threaded portion to stretch to core pipe
In chamber；Plane nut rotation is arranged in core pipe tube chamber；Plane nut along core pipe axially on two side ends be respectively provided with a plane
Threaded portion, the center of plane nut is provided with fastening part；In each flat thread portion and corresponding a set of paw assembly, each paw drives
Dynamic threaded portion engagement adaptation；The inwall of each crimping boss is provided with arcuate groove；The outer wall in each paw pressing plate portion is provided with arc clip slot；
The arcuate groove of a corresponding crimping boss is just arranged by the arc clip slot of each paw, and the arc clip slot of this paw is convex with this crimping
The arcuate groove clamping of platform forms a clamp hole；The direction of rotation in the flat thread portion of plane nut one side is forward, another
The direction of rotation in the flat thread portion of side is reverse, and the direction of rotation driving screw thread on each paw is and adjoins with this paw
Adaptive direction, flat thread portion；Base tube is provided with the installation screw extending radially through base tube wall body；This installation screw is fixed
It is provided with a temperature sensing device.
Temperature sensing device is provided with as puncturing the heat conduction boss used close to one end of core tube hub axis.
The present invention has a positive effect: the zero sequence current mutual inductor of (1) present invention owing to carrying press claw type retaining mechanism,
Can directly be fixedly installed on cable, it is not necessary to reserved installation position, it is easy to install, and there is preferable anti-loosening effect, firmly
Intensity is relatively high and stable reliably.(2) present invention compares with by traditional bolt assembly clamping electric power cable, can apply bigger
Pressure, and there is the anti-loosening effect of excellence, the reliability of long-term work is effectively ensured.(3) present invention uses two casing pressures
Claw assembly is clamped on same cable, has the effect of dual fail-safe, in use goes wrong even if the most a set of, also has another
Set ensures its service behaviour.(4) installation screw of pressure pipe portion wall body is extended radially through along base tube, in installation screw owing to base tube is provided with
It is fixed with temperature sensing device；So the present invention also has real time temperature control function.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention；
Fig. 2 is a kind of perspective view when removing current transformer of the zero sequence current mutual inductor shown in Fig. 1；
Fig. 3 is a kind of front view of zero sequence current mutual inductor shown in Fig. 2；
Fig. 4 is that shown in Fig. 2, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 5 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 2；
Fig. 6 is a kind of explosive view when removing base tube of the zero sequence current mutual inductor shape shown in Fig. 2；
Fig. 7 is that the one of the second structure of the present invention partly cuts open structural representation；
Fig. 8 is the close-up schematic view in Fig. 7 at B；
Fig. 9 is that one when removing current transformer of the zero sequence current mutual inductor shown in Fig. 7 partly cuts open structural representation.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of high pressure zero sequence current mutual inductor with preferable clamp fastness, as shown in Fig. 1 to Fig. 6, including one
Individual base tube 3, plane nut 4 of 1, core pipe 2, two casing pressure claw assembly and a current transformer 9.
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 arcuate groove
111；The internal perisporium of base tube is axially additionally provided with four positioning runners 12 along base tube；Core pipe and base tube are arranged concentrically and are positioned at base tube pipe
Intracavity；The periphery wall of core pipe is provided with four support flanges 21 extended along core pipe radially protruding, each outboard end supporting flange
It is positioned in a corresponding positioning runner, thus core pipe is supported in the tube chamber being positioned at base tube；The tube wall of core pipe is provided with six
The most spacing slide opening 22, each radially spacing slide opening all extends radially through core tube wall along core pipe.
Each casing pressure claw assembly includes three paws 5；Each paw includes pressing plate portion 51, the inwardly projecting shape of inwall from pressing plate portion
The guide runner portion 52 become and the driving threaded portion 53 being arranged in guide runner portion；Pressing plate portion is axially extending along base tube, guides
Slide section radially extends along core pipe；The outer wall in each paw pressing plate portion is provided with arc clip slot 511；Each pressing plate portion is positioned at base tube inwall
With between core tube wall, each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, each driving threaded portion is stretched into
To the tube chamber of core pipe；Each paw radial direction along core pipe under the guide and limit effect of radially spacing slide opening reciprocatingly slides.
In the present embodiment, the radial cross-sectional shape of each radially spacing hole is I-shaped, the radial section in each guide runner portion
Shape is adaptive with radial direction spacing hole I-shaped；In concrete practice, radially spacing hole and the radial section in guide runner portion
Shape also can be selected for other shape, such as circle, rectangle, square, as long as having radially-directed and limit effect.
In the present embodiment, the arcuate groove of a corresponding crimping boss is just arranged by the arc clip slot of each paw, and this paw
Arc clip slot and this crimping boss arcuate groove clamping formed a clamp hole 6, each clamp hole for clamping one electric lines of force
Cable；The present embodiment forms three clamp holes, altogether three electric power cables of clamping altogether.Owing to three electric power cables are from matrix slip pipe tube chamber
In pass, current transformer can carry out zero-sequence current detection by induction mode to three electric power cables, finds in time
Leakage current fault, and send real time information to distance host by wireless transmit/receive units, provide for power circuit intellectuality
Basic data.In the present embodiment, current transformer 9 is ring current transformer, and this ring current transformer is set in outside base tube
On wall.In concrete practice, also can arrange detent on the outer wall of base tube, current transformer is positioned in this detent,
So that current transformer is more firm.In the present embodiment, the size in each clamp hole can be different, is used for clamping difference
The cable of thickness.
Plane nut rotation is arranged in core pipe tube chamber；The periphery wall of plane nut and core inside pipe wall slide adjacent, plane
Nut along core pipe axially on two side ends be respectively provided with a flat thread portion 41, the center of plane nut is provided with fastening part 42；
The driving threaded portion engagement adaptation of each paw in each flat thread portion and corresponding a set of paw assembly；Driving in each casing pressure claw assembly
Dynamic threaded portion all stretches in core pipe tube chamber, and the driving threaded portion in each casing pressure claw assembly is all connected to a corresponding plane spiral shell
In stricture of vagina portion；Each flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove；The driving screw thread of each paw assembly
The thread groove that portion is provided with and this archimedean spiral groove is adaptive, it is adjacent flat that each driving threaded portion is arranged on guide runner portion, place
One side of face nut.
In the present embodiment, the direction of rotation in the flat thread portion of plane nut one side is forward, the plane of another side
The direction of rotation of threaded portion is reverse, and the direction of rotation driving screw thread on each paw is and the flat thread adjacent with this paw
The direction that portion is adaptive.When this structure makes plane nut rotation, by the two of its two side ends flat thread portions, synchronize to drive
Two casing pressure claw assemblies realize clamping or unclamp the cable being positioned 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 twists operation
Use inner hexagon spanner；In concrete practice, described fastening part just can use other shape, the most square or in-line or Flos Mume
Shape, all can select.
In the present embodiment, plane nut, when reciprocating rotation, drives two flat thread portion reciprocating rotations, so by with
In the corresponding a set of paw assembly of driving threaded portion driving that the engagement of each flat thread portion is adaptive, each paw moves, owing to each paw exists
Under the guide and limit effect of the most spacing slide opening, the radial direction only along core pipe moves back and forth, so that in each casing pressure claw assembly
The move mode of paw be close to each other towards core tube hub or away from, thus unclamp or clamp the electric power being positioned in each clamp hole
Cable.The present embodiment achieves and synchronizes to drive each paw in two casing pressure claw assemblies be clamped and unclamp line with a plane nut
The action of cable.
The present embodiment gravity centre distribution is relatively reasonable, when on the overhead power line of high-altitude, is conducive to alleviating vibration；Separately
Outward, the present embodiment drives paw clamping electric power cable by flat thread portion, and by traditional bolt assembly clamping electric lines of force
Cable is compared, particularly excellent in anti-loosening effect, and the reliability of long-term work is effectively ensured.It addition, the present embodiment passes through
Same cable is used two casing pressure claw assembly clampings, there is the effect of dual fail-safe, in use go wrong even if the most a set of,
Also has its service behaviour of another set of guarantee.
(embodiment 2)
The present embodiment and embodiment 1 are essentially identical, and difference is: as shown in Fig. 7 to Fig. 9, and the electric current in the present embodiment is mutual
Sensor 9 includes toroidal inductive body 91 and intelligent control module 92；The monnolithic case of intelligent control module is also annular；Annular sense
Body 91 and intelligent control module 92 is answered to be disposed side by side on the outer wall of base tube.
Base tube 1 is provided with the installation screw 15 extending radially through base tube wall body；This installation screw is fixed with a temperature
Sensing device 8.
Temperature sensing device 8 includes the metal shell 81 with storage tank 811 that metal material makes, is arranged on storage tank
In temperature sensor 82, the spring 83 for temperature sensor is crimped on storage tank diapire, the spiral shell that is used for limit spring
Pipe plug 84.
Metal shell is provided with as puncturing the heat conduction boss 813 used, metal-back close to one end 812 of core tube hub axis
Body is provided with interior hexagonal away from one end 814 of core tube hub axis and twists groove 815；The periphery wall of metal shell is provided with and installs spiral shell
The external screw thread 816 that hole is adaptive, the internal perisporium of storage tank is provided with internal threaded regions 817；Heat conduction boss is close to core from metal shell
The sharp tooth boss formed is protruded in one end 812 of tube hub axis.
Temperature sensor includes using the heat-conducting block 821 that heat conductive insulating elastomeric material is made, the U-shaped being arranged in heat-conducting block
Thermo-sensitive resistor 822, two be arranged on heat-conducting block connect electric mortiser post 823；Heat-conducting block can be reciprocal in the storage tank of metal shell
Slide；Heat-conducting block is connected on the diapire of storage tank close to one end of core tube hub axis；Two connect electric mortiser post protrusion and are arranged on
On the heat-conducting block other end away from core tube hub axis；
Heat-conducting block encloses formation cannelure between external diameter and the internal perisporium of storage tank away from the other end of core tube hub axis
100, spring is positioned in this cannelure and is set on heat-conducting block one end away from core tube hub axis；
Screwed pipe plug is provided with external screw thread district 841 close to the periphery wall of one end of core tube hub axis, this external screw thread district and metal
The internal threaded regions 817 of housing is adaptive；Screwed pipe plug is provided with outer-hexagonal away from the periphery wall of one end of core tube hub axis and twists
Portion 842；The center of screwed pipe plug is provided with tube chamber 843；Screwed pipe plug is fixedly installed in cannelure by its external screw thread district；
Spring is connected on heat-conducting block close to one end of core tube hub axis, and spring abuts away from the other end of core tube hub axis
On screwed pipe plug；On heat-conducting block two connect electric mortiser post and are positioned in the tube chamber 843 of screwed pipe plug.
The internal perisporium of intelligent control module 92 is provided with inwardly projecting two and connects electric bushing (being not drawn on figure), respectively connects electricity
Socket inserts corresponding one and connects in electric bushing, so that temperature sensor is connected with the middle control circuit in intelligent control module.
This structure has the following advantages, owing to metal shell is easily deformed when extruding cable, and extrusion temperature sensor
Heat-conducting block, if heat-conducting block does not has mobile space, then easily pressurized deformation damages；The present embodiment, can by arranging spring
Heat-conducting block is crimped on the diapire of metal shell storage tank so that it is can correctly predict cable and junction, pressing plate pressing plate portion
Real time temperature；Can also be when, after metal shell compressive deformation, reserving mobile space to heat-conducting block, thus prevent heat-conducting block by pressurized
Damage；This structure has preferably Practical Performance.
In concrete practice, multiple installation screw and temperature sensing device can be set on base tube, for each
Cable and the temperature with base tube junction monitor in real time, thus realize the further intellectuality that power network monitoring runs.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, the most also may be used
To make other changes in different forms.Here without also cannot all of embodiment be given exhaustive.And these
Belong to obvious change that the connotation of the present invention extended out or variation still falls within protection scope of the present invention.
Claims (2)
1. a high pressure zero sequence current mutual inductor with preferable clamp fastness, it is characterised in that: include a base tube, a 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, core
The tube wall of 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 includes three
Individual paw, each paw includes pressing plate portion, the guide runner portion of the inwardly projecting formation of inwall from pressing plate portion and to be arranged on guiding sliding
Driving threaded portion in block 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, in each tube chamber driving threaded portion to stretch to core pipe；Plane nut rotation is arranged on core pipe
In tube chamber；Plane nut along core pipe axially on two side ends be respectively provided with a flat thread portion, the center of plane nut is provided with
Fastening part；The driving threaded portion engagement adaptation of each paw in each flat thread portion and corresponding a set of paw assembly；Respectively crimp boss
Inwall be provided with arcuate groove；The outer wall in each paw pressing plate portion is provided with arc clip slot；The arc clip slot of each paw is just to corresponding one
The arcuate groove of individual crimping boss is arranged, and the arcuate groove clamping of the arc clip slot of this paw and this crimping boss forms a clamp
Hole；The direction of rotation in the flat thread portion of plane nut one side is forward, the direction of rotation in the flat thread portion of another side
It is reverse, the direction that the direction of rotation driving screw thread on each paw is and the flat thread portion adjacent with this paw is adaptive；Base
Pipe is provided with the installation screw extending radially through base tube wall body；This installation screw is fixed with a temperature sensing device.
The high pressure zero sequence current mutual inductor with preferable clamp fastness the most according to claim 1, it is characterised in that: temperature
Sensing device is provided with as puncturing the heat conduction boss used close to one end of core tube hub axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610288714.6A CN105845366A (en) | 2016-05-02 | 2016-05-02 | High-voltage zero-sequence current transformer with relatively good wire clamping fastness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610288714.6A CN105845366A (en) | 2016-05-02 | 2016-05-02 | High-voltage zero-sequence current transformer with relatively good wire clamping fastness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105845366A true CN105845366A (en) | 2016-08-10 |
Family
ID=56590856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610288714.6A Withdrawn CN105845366A (en) | 2016-05-02 | 2016-05-02 | High-voltage zero-sequence current transformer with relatively good wire clamping fastness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105845366A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1319448A2 (en) * | 2001-12-11 | 2003-06-18 | Mario Fabris | Two stage clamping pinion |
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
-
2016
- 2016-05-02 CN CN201610288714.6A patent/CN105845366A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1319448A2 (en) * | 2001-12-11 | 2003-06-18 | Mario Fabris | Two stage clamping pinion |
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
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Application publication date: 20160810 |