CN105679501A - Improved zero-sequence current transformer - Google Patents
Improved zero-sequence current transformer Download PDFInfo
- Publication number
- CN105679501A CN105679501A CN201610097460.XA CN201610097460A CN105679501A CN 105679501 A CN105679501 A CN 105679501A CN 201610097460 A CN201610097460 A CN 201610097460A CN 105679501 A CN105679501 A CN 105679501A
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- CN
- China
- Prior art keywords
- tube
- core pipe
- base tube
- current transformer
- paw
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- 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
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses an improved zero-sequence current transformer, which comprises a base tube, a core tube, two sets of press claw components, two flat nuts and a current transformer body, wherein the current transformer body sleeves the base tube; crimping bosses are arranged on the base tube; radial limiting slide holes are formed in the tube wall of the core tube; a stopping table is arranged on the inner circumference wall of the core tube; the two flat nuts are rotationally arranged in a tube cavity of the core tube, and are separately located at two sides of the stopping table; a drive thread part in each set of press claw components is located at on one side, far away from one corresponding flat nut, of the stopping table; each flat nut comprises a fastening part and a plane thread part which is meshed and matched with the press claws in one corresponding set of press claw components; and each flat nut drives the corresponding plane thread part thereof to rotate in a reciprocating manner, so that the press claws in one corresponding set of press claw components are driven to be close to or far away from the center of the core tube. The improved zero-sequence current transformer has an excellent anti-looseness effect.
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 ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flow into the algebraical sum of telegram in reply stream of any node in circuit equal to zero. Under circuit with the normal situation of electrical equipment, the vector of each phase current is equal to zero, and therefore, the secondary side winding no signal output of zero sequence current mutual inductor, executive component is failure to actuate. When the vector of each phase current occurring to get an electric shock or during leak current fault is not zero, fault current makes to produce magnetic flux in the iron core of zero sequence current mutual inductor, and produced by zero sequence current mutual inductor, electric current 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 is it is generally required to reserve, therefore makes its application be subject to more restriction.
Summary of the invention
It is an object of the invention to provide and a kind of be easily installed location, there is better firmness, effectively prevent the modified model zero sequence current mutual inductor that loosens.
The technical scheme realizing the object of the invention is: a kind of modified model zero sequence current mutual inductor, including a base tube, core pipe, two casing pressure claw assemblies, two plane nuts and a current transformer; Current transformer is set on base tube; The internal perisporium of base tube is provided with crimping boss; Core pipe and base tube are arranged concentrically and are positioned at base tube tube chamber; The tube wall of core pipe is provided with the spacing slide opening of multiple radial direction, and the internal perisporium of core pipe is provided with a gear platform; Each casing pressure claw assembly includes three paws, and each paw includes pressing plate portion, from the guide runner portion of the inwardly projecting formation of inwall in pressing plate portion 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, in each tube chamber driving threaded portion to stretch to core pipe; Each pressing plate portion and a corresponding crimping boss clamping form a clamp hole; Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation gear platforms; The threaded portion that drives in each casing pressure claw assembly is respectively positioned on the corresponding plane nut side away from gear platform; Each plane nut includes fastening part and engages the flat thread portion of adaptation with the threaded portion that drives of each paw in corresponding a set of paw assembly; Each plane nut drives its flat thread portion reciprocating rotation, so drive each paw in corresponding a set of paw assembly close to each other towards core tube hub or away from.
The present invention has positive effect: the modified model zero sequence current mutual inductor of (1) present invention is owing to carrying press claw type retaining mechanism, it is not necessary to reserved installation position, it is easy to installing, and have good anti-loosening effect, firm intensity is relatively high and stable reliably.(2) present invention compares with by traditional bolt assembly clamping electric power cable, it is possible to applies bigger pressure, and has excellent anti-loosening effect, is effectively ensured the reliability of long-term work. (3) 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 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.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of modified model zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 6, including a base tube 3, two plane nuts 4 of 1, core pipe 2, two casing pressure claw assembly and a current transformer 8.
The internal perisporium of base tube is axially arranged with three crimping boss 11 along base tube, and each inwall 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 tube chamber; The periphery wall of core pipe is provided with four support flanges 21 extended along core pipe radially protruding, and each outboard end supporting flange is arranged in a corresponding positioning runner, thus core pipe being supported in the tube chamber being positioned at base tube; The tube wall of core pipe is provided with six spacing slide openings 22 of radial direction, and each radially spacing slide opening all extends radially through core tube wall along core pipe; The internal perisporium of core pipe is provided with three annular gear platforms 23 of inwardly projecting formation.
Each casing pressure claw assembly includes three paws 5; Every casing pressure claw assembly and a corresponding plane nut are adaptive; Each paw includes pressing plate portion 51, from the guide runner portion 52 of the inwardly projecting formation of inwall in pressing plate portion and the driving threaded portion 53 that is arranged on guide runner portion; Pressing plate portion is axially extending along base tube, and guide runner portion 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 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; Each paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of radially spacing slide opening.
In the present embodiment, the radial cross-sectional shape of each radially spacing hole is I-shaped, and the radial cross-sectional shape in each guide runner portion is adaptive with radial direction spacing hole I-shaped; In concrete practice, radially the radial cross-sectional shape in spacing hole and guide runner portion also can be selected for other shape, for instance 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 the arcuate groove clamping of the arc clip slot of this paw and this crimping boss forms a clamp hole 6, and each clamp hole is used for clamping an electric power cable; The present embodiment forms three clamp holes altogether, altogether three electric power cables of clamping. Owing to three electric power cables pass from matrix slip pipe tube chamber, three electric power cables can be carried out zero-sequence current detection by induction mode by current transformer, for finding leakage current fault in time, and send real time information to distance host by wireless transmit/receive units, provide basic data for power circuit intellectuality. 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 arranging detent on the outer wall of base tube, current transformer is arranged in this detent, so that current transformer is more firm. In the present embodiment, the size in each clamp hole can be different, for clamping the cable of different thicknesses.
Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation annular gear platforms; The threaded portion that drives in each casing pressure claw assembly is respectively positioned on the corresponding plane nut side away from annular gear platform; The periphery wall of each plane nut and core inside pipe wall slide adjacent, and the center of each plane nut is provided with fastening part 42; One side of each plane nut and annular gear platform slide adjacent, and another side is provided with and engages the flat thread portion 41 of adaptation with the threaded portion that drives of each paw in corresponding a set of paw assembly; Flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove; The thread groove that driving threaded portion is provided with and this archimedean spiral groove is adaptive of each paw assembly, each side driving threaded portion to be arranged on guide runner portion, place adjacent flat nut.
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, for instance square or in-line or quincunx, all can select.
In the present embodiment, each plane nut is when reciprocating rotation, drive its flat thread portion reciprocating rotation, and then drive each paw in corresponding a set of paw assembly to move by the driving threaded portion adaptive to the engagement of this flat thread portion, owing to each paw radial direction only along core pipe under the guide and limit effect of radially spacing slide opening 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 unclamping or clamping the electric power cable being arranged in each clamp hole.
The present embodiment gravity centre distribution is relatively reasonable, when on the overhead power line of high-altitude, is conducive to alleviating vibration; It addition, the present embodiment drives paw clamping electric power cable by flat thread portion, compare with by traditional bolt assembly clamping electric power cable, particularly excellent in anti-loosening effect, it is effectively ensured the reliability of long-term work. It addition, the present embodiment by adopting two casing pressure claw assembly clampings to same cable, there is the effect of dual fail-safe, in use go wrong even if wherein a set of, also have its service behaviour of another set of guarantee.
The present embodiment can use as high pressure zero sequence current mutual inductor, for detecting the existence of leakage current, to find leak current fault in time.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, 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 without also cannot all of embodiment be given exhaustive. And the apparent change that these connotations belonging to the present invention are extended out or variation still fall within protection scope of the present invention.
Claims (1)
1. a modified model zero sequence current mutual inductor, it is characterised in that: include a base tube, core pipe, two casing pressure claw assemblies, two plane nuts and a current transformer; Current transformer is set on base tube; The internal perisporium of base tube is provided with crimping boss; Core pipe and base tube are arranged concentrically and are positioned at base tube tube chamber; The tube wall of core pipe is provided with the spacing slide opening of multiple radial direction, and the internal perisporium of core pipe is provided with a gear platform; Each casing pressure claw assembly includes three paws, and each paw includes pressing plate portion, from the guide runner portion of the inwardly projecting formation of inwall in pressing plate portion 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, in each tube chamber driving threaded portion to stretch to core pipe; Each pressing plate portion and a corresponding crimping boss clamping form a clamp hole; Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation gear platforms; The threaded portion that drives in each casing pressure claw assembly is respectively positioned on the corresponding plane nut side away from gear platform; Each plane nut includes fastening part and engages the flat thread portion of adaptation with the threaded portion that drives of each paw in corresponding a set of paw assembly; Each plane nut drives its flat thread portion reciprocating rotation, so drive each paw in corresponding a set of paw assembly close to each other towards core tube hub or away from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097460.XA CN105679501A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097460.XA CN105679501A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105679501A true CN105679501A (en) | 2016-06-15 |
Family
ID=56304793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610097460.XA Withdrawn CN105679501A (en) | 2016-01-15 | 2016-01-15 | Improved zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105679501A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
-
2016
- 2016-01-15 CN CN201610097460.XA patent/CN105679501A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN204724882U (en) * | 2015-06-01 | 2015-10-28 | 冯炯培 | A kind of three-jaw clamping device |
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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 |
Application publication date: 20160615 |
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| WW01 | Invention patent application withdrawn after publication |