CN105551763A - Improved zero-sequence current transformer - Google Patents
Improved zero-sequence current transformer Download PDFInfo
- Publication number
- CN105551763A CN105551763A CN201610099025.0A CN201610099025A CN105551763A CN 105551763 A CN105551763 A CN 105551763A CN 201610099025 A CN201610099025 A CN 201610099025A CN 105551763 A CN105551763 A CN 105551763A
- Authority
- CN
- China
- Prior art keywords
- core pipe
- paw
- tube
- base tube
- crimping
- 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- Withdrawn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
-
- 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)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses an improved zero-sequence current transformer, which comprises a base tube, a core tube, two crimping parts and two sets of press claw assemblies, wherein a plurality of wire clamping bosses are arranged on the inner circumference wall of the base tube; the tube wall of the core tube is provided with two groups of guide holes; each group of guide holes comprise a plurality of radial limiting slide holes; two inner thread regions are arranged on the inner wall of the core tube; each set of press claw assemblies comprises a plurality of press claws; each press claw comprises a press plate part, a guide slide block part and a drive surface; each crimping part comprises a body, an outer thread region and a crimping boss; each outer thread region is arranged on the outer circumference wall of the body; each crimping boss is arranged at the inner side end of the columnar body; the outer thread regions of the crimping parts are matched with the inner thread regions of the core tube; the drive surface of each press claw is matched with the outer circumference wall of the corresponding crimping boss; and each crimping part pushes the press plate parts in one corresponding set of press claw assemblies to move outwards along the radial direction of the core tube when rotating along the preset direction. The improved zero-sequence current transformer has relatively good performance.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of modified model 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 the application of zero sequence current mutual inductor be subject to more restriction.
Summary of the invention
The object of this invention is to provide a kind of modified model zero sequence current mutual inductor being convenient to install location, there is better firmness.
The technical scheme realizing the object of the invention is: a kind of modified model zero sequence current mutual inductor, comprises a base tube, core pipe, two crimps and two casing pressure claw assemblies; The internal perisporium of base tube is provided with multiple clamp boss; Core pipe is arranged in base tube tube chamber; The tube wall of core pipe is provided with two groups of pilot holes, and each group pilot hole comprises the spacing slide opening of multiple radial direction; The inwall of core pipe is provided with two internal threaded regions; Each casing pressure claw assembly includes multiple paw; Each paw comprises pressing plate portion, protrudes the guide runner portion formed and the drive surface be arranged on guide runner portion from pressing plate portion; Each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, and each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned between base tube inwall and core tube wall; The pressing plate portion of each paw and the clamping of a corresponding clamp boss form one for clamping the clamp hole of electric power cable; The crimping boss that each crimp comprises body, is arranged on the external screw thread district on body peripheral wall and is arranged on cylindrical body medial extremity, the external screw thread district of crimp and the internal threaded regions adaptation of core pipe; The drive surface of each paw and the periphery wall adaptation of crimping boss; The shape of crimping boss is circular cone shape; Crimping boss extends along the axis of base tube, and is arranged in core pipe tube chamber; Crimp also comprises the fastening part being arranged on cylindrical body outboard end; The drive surface of each paw is and the curved surface or the inclined-plane that crimp boss periphery wall adaptation; Core pipe and base tube are arranged with one heart; Pressing plate portion axially extends along base tube, and guide runner portion extends along base tube radial direction; The spacing slide opening of radial direction in each group of pilot hole is evenly distributed on core tube wall along core pipe circumference; In each casing pressure claw assembly, the quantity of paw is identical with the quantity of the slide opening that leads in each group of pilot hole; When each crimp rotates along preset direction, crimping boss is driven to rotate while advance in core pipe tube chamber, crimping boss promotes each paw by the drive surface in the corresponding a set of paw assembly of pushing, pressing plate portion in corresponding a set of paw assembly is radially outward moved along core pipe, thus clamping is arranged in the electric power cable 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.(2) crimp is connected threadably with core pipe, and pushes the drive surface of each paw by crimping boss, and then promotes each paw and move along core pipe radial direction; Its operation is comparatively laborsaving, and has good anti-loosening effect.(3) the present invention adopts two casing pressure claw assemblies to be clamped on same cable, the clamp operation of each casing pressure claw assembly can be carried out separately, this structure has the effect of double shield, 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 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 Fig. 1;
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 removes a kind of explosive view after base tube and crimp for zero sequence current mutual inductor shown in Fig. 2;
Fig. 7 is that the one of the second structure of the present invention partly cuts open structural representation;
A kind of structural representation that Fig. 8 is zero sequence current mutual inductor shown in Fig. 7.
Embodiment
(embodiment 1)
The present embodiment is a kind of modified model zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 6, comprises a base tube 1, core pipe 2, current transformer 7, two crimps 3 and two casing pressure claw assemblies 8.
In the present embodiment, base tube, core pipe 2, two crimps 3 and two casing pressure claw assemblies 8 all adopt insulating material to make.
The internal perisporium of base tube is provided with four clamp boss 11, and the inwall of each clamp boss is provided with deep-slotted chip breaker 111, and each clamp boss and deep-slotted chip breaker all axially extend along base tube.The internal perisporium of base tube is axially also provided with multiple positioning runner 12 along base tube.
Core pipe and base tube are arranged with one heart, and core pipe is arranged in base tube tube chamber; The periphery wall of core pipe is provided with four and protrudes along base tube radial direction 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 two groups of pilot holes, each group pilot hole and a set of paw assembly adaptation; Each group of pilot hole comprises four spacing slide openings 22 of radial direction, and these four spacing slide openings of radial direction are evenly distributed on core tube wall along core pipe circumference; The spacing slide opening of each radial direction all runs through core tube wall along the radial direction of base tube; The spacing slide opening of each radial direction is positioned at core tubular axis middle part upwards, and the cross sectional shape of the spacing slide opening of each radial direction is I-shaped.The inwall of core pipe is provided with 23, two groups, two internal threaded regions pilot hole between two internal threaded regions; In the present embodiment, two internal threaded regions are arranged on the inwall at core pipe two side ends adjacent openings place.
In concrete practice, the cross sectional shape of guiding slide opening also can adopt other shape, and such as circular, square, rhombus is all feasible.
Each casing pressure claw assembly 8 comprises four paws 4; Each paw comprises pressing plate portion 41, from the inwall in pressing plate portion to the guide runner portion 42 of projecting inward formation and the drive surface 43 that is arranged on guide runner portion; Pressing plate portion axially extends along base tube, and guide runner portion extends along base tube radial direction; The outer wall in each paw pressing plate portion is provided with arc clip slot 411; Each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, and each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned between base tube inwall and core tube wall; Each paw reciprocatingly slides along the radial direction of base tube under the guide and limit effect of the spacing slide opening of radial direction; The cross sectional shape in each guide runner portion is the I-shaped of the spacing slide opening adaptation with radial direction.
Corresponding clamp boss clamping on each pressing plate portion and base tube forms one for clamping the clamp hole 5 of electric power cable; In the present embodiment, the arc clip slot in each pressing plate portion and the deep-slotted chip breaker clamping of a corresponding clamp boss form the clamp hole 5 for clamping electric power cable; The present embodiment forms four clamp holes altogether.
Each crimp 3 comprises cylindrical body 31, the external screw thread district 32 be arranged on cylindrical body periphery wall, the fastening part 33 being arranged on cylindrical body outboard end and the crimping boss 34 be arranged on cylindrical body medial extremity, the shape of crimping boss is circular cone shape; The external screw thread district of each crimp and the internal threaded regions adaptation of core pipe; Crimping boss extends along the axis of base tube, and is arranged in core pipe tube chamber.
In the present embodiment, the drive surface of each paw is the curved surface of and crimping boss periphery wall adaptation, and in concrete practice, this drive surface also can select inclined-plane.
In the present embodiment, in each casing pressure claw assembly, the quantity of paw is identical with the quantity of the slide opening that leads in each group of pilot hole, and at least three.。
Current transformer 7 comprises toroidal inductive body 71 and intelligent control module 72; In the present embodiment, intelligent control module 72 is made has onesize vestibule with toroidal inductive body, and annular perception induction body and intelligent control module are arranged side by side and are combined to form annular, and current transformer entirety is sheathed to be fixed on the periphery wall of base tube.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 annular base tube senses, to realize accurate long-range no worker monitor, Timeliness coverage leak current fault.
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 each crimp rotates along preset direction, crimping boss is driven to rotate while advance in core pipe tube chamber, each crimping boss promotes paw by the drive surface in the corresponding a set of paw assembly of pushing, each pressing plate portion in corresponding a set of paw assembly 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) crimp is connected threadably with core pipe, and pushes the drive surface of each paw by crimping boss, and then promotes each paw and move along core pipe radial direction; Its operation is comparatively laborsaving, and has good anti-loosening effect.(2) the present invention adopts two casing pressure claw assemblies to be clamped on same cable, the clamp operation of each casing pressure claw assembly can be carried out separately, this structure has the effect of double shield, in use goes wrong even if wherein a set of, also has its service behaviour of another set of guarantee.
(embodiment 2)
The present embodiment is substantially identical with embodiment 1, and difference is: see shown in Fig. 7 to Fig. 8, and in the present embodiment, body is sheathed is fixed on the periphery wall of base tube for the induction of annular perception; The periphery wall of base tube is provided with the routing hole 13 radially running through tube wall; Between base tube inwall, core tube wall, clamp boss, support flange, paw pressing plate portion, clamping forms multiple containing cavity 73, and intelligent control module is arranged in containing cavity; Electric connection line between toroidal inductive body and intelligent control module is through described routing hole.This structure can make full use of space, is conducive to the small-sized and integrated of entirety.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not 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 modified model zero sequence current mutual inductor, is characterized in that: comprise a base tube, core pipe, two crimps and two casing pressure claw assemblies; The internal perisporium of base tube is provided with multiple clamp boss; Core pipe is arranged in base tube tube chamber; The tube wall of core pipe is provided with two groups of pilot holes, and each group pilot hole comprises the spacing slide opening of multiple radial direction; The inwall of core pipe is provided with two internal threaded regions; Each casing pressure claw assembly includes multiple paw; Each paw comprises pressing plate portion, protrudes the guide runner portion formed and the drive surface be arranged on guide runner portion from pressing plate portion; Each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, and each drive surface stretches in the tube chamber of core pipe, and each pressing plate portion is positioned between base tube inwall and core tube wall; The pressing plate portion of each paw and the clamping of a corresponding clamp boss form one for clamping the clamp hole of electric power cable; The crimping boss that each crimp comprises body, is arranged on the external screw thread district on body peripheral wall and is arranged on cylindrical body medial extremity, the external screw thread district of crimp and the internal threaded regions adaptation of core pipe; The drive surface of each paw and the periphery wall adaptation of crimping boss; The shape of crimping boss is circular cone shape; Crimping boss extends along the axis of base tube, and is arranged in core pipe tube chamber; Crimp also comprises the fastening part being arranged on cylindrical body outboard end; The drive surface of each paw is and the curved surface or the inclined-plane that crimp boss periphery wall adaptation; Core pipe and base tube are arranged with one heart; Pressing plate portion axially extends along base tube, and guide runner portion extends along base tube radial direction; The spacing slide opening of radial direction in each group of pilot hole is evenly distributed on core tube wall along core pipe circumference; In each casing pressure claw assembly, the quantity of paw is identical with the quantity of the slide opening that leads in each group of pilot hole; When each crimp rotates along preset direction, crimping boss is driven to rotate while advance in core pipe tube chamber, crimping boss promotes each paw by the drive surface in the corresponding a set of paw assembly of pushing, pressing plate portion in corresponding a set of paw assembly is radially outward moved along core pipe, thus clamping is arranged in the electric power cable in clamp hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099025.0A CN105551763A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099025.0A CN105551763A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105551763A true CN105551763A (en) | 2016-05-04 |
Family
ID=55830893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610099025.0A Withdrawn CN105551763A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105551763A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5869785A (en) * | 1997-06-10 | 1999-02-09 | Antec Corporation | Wire clamp with parallel gripping action |
| CN102354940A (en) * | 2011-10-29 | 2012-02-15 | 浙江左易电力设备有限公司 | Wedge-shape strain clamp of bunched cable |
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
-
2016
- 2016-01-15 CN CN201610099025.0A patent/CN105551763A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5869785A (en) * | 1997-06-10 | 1999-02-09 | Antec Corporation | Wire clamp with parallel gripping action |
| CN102354940A (en) * | 2011-10-29 | 2012-02-15 | 浙江左易电力设备有限公司 | Wedge-shape strain clamp of bunched cable |
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160504 |
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| WW01 | Invention patent application withdrawn after publication |