CN105551742A - Power zero-sequence current transformer - Google Patents
Power zero-sequence current transformer Download PDFInfo
- Publication number
- CN105551742A CN105551742A CN201610097328.9A CN201610097328A CN105551742A CN 105551742 A CN105551742 A CN 105551742A CN 201610097328 A CN201610097328 A CN 201610097328A CN 105551742 A CN105551742 A CN 105551742A
- Authority
- CN
- China
- Prior art keywords
- slip pipe
- paw
- slide opening
- matrix
- radially
- 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- Withdrawn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
- H02G7/04—Arrangements or devices for relieving mechanical tension
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Breakers (AREA)
Abstract
The invention discloses a power zero-sequence current transformer, which comprises a base body, two flat nuts, two sets of press claw components, a core rod and a current transformer body, wherein the base body is provided with a slide tube, radial guide limiting holes and a stopping table; each set of press claw components comprises three press claws; each press claw is located in one corresponding radial guide limiting hole; each flat nut is matched with one corresponding set of press claw components; the current transformer body is fixedly arranged at the middle part of the stopping table; the core rod is located in a tube cavity of the slide tube of the base body; three arc-shaped clamping grooves are arranged on the outer circumference wall of the core rod along the axial direction of the center of the slide tube of the base body; each arc-shaped clamping groove is arranged oppositely to an arc-shaped groove in the inner wall of one corresponding press claw; each arc-shaped clamping groove and corresponding one arc-shaped groove are clamped to form a wire clamping hole; and each flat nut drives the three press claws in the corresponding set of press claw components to be close to or far away from the center of the slide tube. The power zero-sequence current transformer is easy to install and use.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of electric power zero sequence current mutual inductor.
Background technology
The general principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): the algebraical sum flowing into the telegram in reply stream of any node in circuit equals zero.Under circuit and the normal situation of electric equipment, the vector of each phase current equals zero, and therefore, the secondary side winding no signal of zero sequence current mutual inductor exports, and executive component is failure to actuate.The vector of each phase current when there is electric shock or leak current fault is non-vanishing, and fault current makes to produce magnetic flux in the iron core of zero sequence current mutual inductor, and the electric current that zero sequence current mutual inductor produces is zero-sequence current.When protection mechanism receives this zero sequence current signal, corresponding protection act can be taked according to electrical leakage quantity.
Mostly the mounting means of existing zero sequence current mutual inductor is to adopt flange install fixing or adopt bonding mode to fix, and its installation site generally needs to reserve, therefore makes 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 electric power 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 electric power zero sequence current mutual inductor, is characterized in that: comprise matrix, two plane nuts, two casing pressure claw assemblies, a plug and current transformers; The gear platform that matrix is provided with slip pipe, is arranged on the radially-directed spacing hole on slip pipe and is arranged on slip pipe periphery wall; Each casing pressure claw assembly comprises three paws; Matrix slip pipe two ends axially respectively arrange three radially-directed spacing holes, and each paw is arranged in a corresponding radially-directed spacing hole, and the radial direction of each paw along matrix slip pipe under the guide and limit effect of radially-directed spacing hole reciprocatingly slides; Each plane nut and corresponding a set of paw assembly adaptation; Each plane nut sleeve is located on the periphery wall of matrix slip pipe, and between gear platform and corresponding a set of paw assembly; The middle part of gear platform is provided with a circular orientation groove, and current transformer is fixedly installed in this detent; Each paw is provided with pressing plate portion, along the radial guide runner portion extended to form of matrix slip pipe and the driving threaded portion be arranged in guide runner portion; Threaded portion is driven to be arranged on the side of guide runner portion close to gear platform; Plug is arranged in matrix slip pipe tube chamber; The periphery wall of plug is axially arranged with three arc clip slots along base tube center, and each arc clip slot is just arranged the deep-slotted chip breaker on a corresponding paw inwall, and each arc clip slot and a corresponding deep-slotted chip breaker clamping form a clamp hole for sandwiched cable; The periphery wall of plug is axially arranged with three arc clip slots along base tube center, and each arc clip slot is just arranged the deep-slotted chip breaker on a corresponding paw inwall, and each arc clip slot and a corresponding deep-slotted chip breaker clamping form a clamp hole; Each radially-directed spacing hole comprises rectangle slide opening and anticreep slide opening, and rectangle slide opening is arranged on the edge of matrix slip pipe away from a side of gear platform, and form a breach, anticreep slide opening is communicated with rectangle slide opening; The limiting section that each paw guide runner portion is provided with the guide part being arranged in rectangle slide opening, the anti-delinking part being arranged in anticreep slide opening and is positioned at outside matrix slip pipe, threaded portion is driven to be arranged on the side end wall of anti-delinking part adjacent flat nut, the shape of anti-delinking part and anticreep slide opening adaptation; The periphery wall of each plane nut is provided with fastening part, and each plane nut is provided with flat thread portion away from a side of gear platform, and adaptation then engages with the driving threaded portion of three paws in corresponding a set of paw assembly in each flat thread portion; Each plane nut drives its flat thread portion reciprocating rotation, so by the driving threaded portion of its engagement adaptation drive three paws in corresponding a set of paw assembly towards slip pipe center close to each other or away from.
The present invention has positive effect: (1) the present invention drives paw clamping electric power cable by flat thread portion, compare with by traditional bolt assembly clamping electric power cable, larger pressure can be applied, and there is excellent anti-loosening effect, effectively ensure the reliability of long-term work.(2) zero sequence current mutual inductor of the present invention is 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.(3) the present invention adopts two casing pressure claw assemblies, has the effect of dual fail-safe, in use goes wrong even if wherein a set of, also has its service behaviour of another set of guarantee.
Accompanying drawing explanation
Fig. 1 is a kind of perspective view of the present invention;
A kind of front view that Fig. 2 is zero sequence current mutual inductor shown in Fig. 1;
Fig. 3 partly cuts open structural representation for the one of zero sequence current mutual inductor shown in Fig. 1;
A kind of explosive view that Fig. 4 is zero sequence current mutual inductor shown in Fig. 1;
The explosive view that Fig. 5 decomposes after removing section components further for zero sequence current mutual inductor shown in Fig. 4.
Be labeled as shown in accompanying drawing: matrix 1, slip pipe 11, radially-directed spacing hole 12, rectangle slide opening 121, anticreep slide opening 122, gear platform 13, detent 131, positioning runner 15, plane nut 2, fastening part 21, flat thread portion 22, paw assembly 3, paw 4, pressing plate portion 41, guide runner portion 43, guide part 431, anti-delinking part 432, limiting section 433, drives threaded portion 44, deep-slotted chip breaker 45, clamp hole 5, plug 6, arc clip slot 61, supporting and location flange 62, current transformer 7.
Embodiment
(embodiment 1)
The present embodiment is a kind of electric power zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 5, comprises matrix 1, two plane nut 2, two casing pressure claw assemblies, 3, plug 6 and a current transformer 7; Each casing pressure claw assembly comprises three paws 4; Matrix is provided with slip pipe 11, is arranged on the radially-directed spacing hole 12 on slip pipe and is arranged on the gear platform 13 formed along the radial evagination of slip pipe on slip pipe periphery wall; Radially-directed spacing hole runs through slip pipe tube wall along the radial direction of matrix slip pipe; The shape of gear platform is ring-type, and gear platform is positioned at the middle-end of matrix slip pipe.
The middle part of gear platform is provided with a circular orientation groove 131, and current transformer 7 is fixedly installed in this detent.
The quantity of radially-directed spacing hole 12 is identical with the quantity of paw 4, totally six, and matrix slip pipe two ends axially respectively arrange three radially-directed spacing holes, and these three radially-directed spacing holes are used for and corresponding a set of paw assembly 3 adaptation; Each paw is arranged in a corresponding radially-directed spacing hole 12, and the radial direction of each paw along matrix slip pipe 11 under the guide and limit effect of radially-directed spacing hole reciprocatingly slides;
The shape of each plane nut 2 is ring-type, and each plane nut sleeve is located on the periphery wall of matrix slip pipe 11, and between gear platform 13 and corresponding a set of paw assembly 3; The two side ends of two plane nut separation gear platforms, two casing pressure claw assemblies are also lived apart and are kept off the two side ends of platform.
Each paw is provided with pressing plate portion 41, along the guide runner portion 43 that matrix slip pipe 11 radial direction extends to form and the driving threaded portion 44 that is arranged in guide runner portion; Threaded portion 44 is driven to be arranged on a side of guide runner portion adjacent flat nut; The inwall in pressing plate portion is curved, forms a deep-slotted chip breaker 45.
Plug 6 is arranged in matrix slip pipe tube chamber; The periphery wall of plug 6 is axially arranged with three arc clip slots 61 along base tube center, each arc clip slot is just arranged the deep-slotted chip breaker 45 on a corresponding paw inwall, each arc clip slot and a corresponding deep-slotted chip breaker clamping form a clamp hole 5, so the present embodiment forms three clamp holes 5 altogether, can be used for clamping three cables simultaneously, in concrete practice, each clamp hole is for clamping a corresponding phase cable.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.
The periphery wall of plug is provided with three supporting and location flanges 62 protruded along matrix slip pipe radial direction, the internal perisporium of matrix slip pipe is provided with three positioning runners 15, each supporting and location flange stretches in a corresponding positioning runner away from a side of plug, thus plug is positioned in the tube chamber of matrix slip pipe.
Because existing electric power cable is insulation cable mostly, therefore the present embodiment can adopt metal material to make; But in order to reinforced insulation intensity, the present embodiment preferably adopts insulating material to make.
In the present embodiment, each paw is the integral piece made by cast molding.
The internal perisporium of each plane nut is the smooth inner wall with matrix slip pipe periphery wall adaptation, the periphery wall of each plane nut is provided with fastening part 21, each plane nut is provided with flat thread portion 22 away from a side of gear platform, flat thread portion is provided with archimedean spiral groove, adaptation then engages with the driving threaded portion of paw in flat thread portion, and the side that each plane nut adjoins gear platform slides adjacent with gear platform; The fastening part 21 of the present embodiment midplane nut is the outer-hexagonal shape fastener head be arranged on plane nut periphery wall, and it is twisted operation and adopts inner hexagon spanner, shfting wrench or fork spanner; In concrete practice, described fastening part just can adopt other shape, such as, adopt the multiple binding grooves be evenly distributed on plane nut periphery wall, and it is twisted operation and adopts hook type spanner (being commonly called as hook spanner).
In the present embodiment, each radially-directed spacing hole 12 comprises rectangle slide opening 121 and anticreep slide opening 122, rectangle slide opening is arranged on matrix slip pipe away from gear edge of table place, form a breach, anticreep slide opening is communicated with rectangle slide opening, anticreep slide opening is positioned at the inboard of rectangle slide opening, and anticreep slide opening and rectangle slide opening are combined to form T-shaped hole;
The limiting section 433 that each paw guide runner portion 43 is provided with the guide part 431 being arranged in rectangle slide opening, the anti-delinking part 432 being arranged in anticreep slide opening and is positioned at outside matrix slip pipe, the cross sectional shape that the guide part 431 of each paw, anti-delinking part 432 and limiting section 433 are combined to form is I-shaped; Each paw is run through along the radial direction of matrix slip pipe in the guide part 431 of each paw and anti-delinking part 432; Threaded portion is driven to be arranged on the side end wall of anti-delinking part away from gear platform, the shape of anti-delinking part and anticreep slide opening adaptation; Drive threaded portion to protrude to be arranged on the side end wall of anti-delinking part adjacent flat nut, make to drive threaded portion can not move in anticreep slide opening.
The present embodiment, when carrying out clamp operation, adopts inner hexagon spanner, shfting wrench or fork spanner to twist plane nut; Plane nut is in reciprocating rotation, drive its flat thread portion reciprocating rotation, and then drive paw by the driving threaded portion of engaging adaptation with it, because each paw can only move back and forth along the radial direction of matrix slip pipe under the guide and limit effect of radially-directed spacing hole 12, thus make the move mode of each paw be close to each other towards slip pipe center or away from, thus clamping or unclamp the electric power cable being arranged in clamp hole 5.
The present embodiment is by being arranged on the longitudinal center line place of matrix slip pipe cable clamping, and its 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 the present embodiment, the both sides of gear platform respectively have a plane nut and a set of paw assembly with this plane nut adaptation, during this plane nut rotation, drive three paws in this casing pressure claw assembly along the radial direction of matrix slip pipe, towards matrix slip pipe center close to each other or away from.This structure makes each casing pressure claw assembly to clamp separately and to unclamp.In addition, two casing pressure claw assemblies are clamped on same cable, have 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, 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.The present embodiment can have the real-time monitoring of non-zero-sequence current to the threephase cable being arranged in three clamp holes, with Timeliness coverage leak current fault.The present embodiment can be used for high-altitude power circuit, high-voltage switch gear, box-type substation and switch cubicle.
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. an electric power zero sequence current mutual inductor, is characterized in that: comprise matrix, two plane nuts, two casing pressure claw assemblies, a plug and current transformers; The gear platform that matrix is provided with slip pipe, is arranged on the radially-directed spacing hole on slip pipe and is arranged on slip pipe periphery wall; Each casing pressure claw assembly comprises three paws; Matrix slip pipe two ends axially respectively arrange three radially-directed spacing holes, and each paw is arranged in a corresponding radially-directed spacing hole, and the radial direction of each paw along matrix slip pipe under the guide and limit effect of radially-directed spacing hole reciprocatingly slides; Each plane nut and corresponding a set of paw assembly adaptation; Each plane nut sleeve is located on the periphery wall of matrix slip pipe, and between gear platform and corresponding a set of paw assembly;
The middle part of gear platform is provided with a circular orientation groove, and current transformer is fixedly installed in this detent; Each paw is provided with pressing plate portion, along the radial guide runner portion extended to form of matrix slip pipe and the driving threaded portion be arranged in guide runner portion; Threaded portion is driven to be arranged on the side of guide runner portion close to gear platform; Plug is arranged in matrix slip pipe tube chamber; The periphery wall of plug is axially arranged with three arc clip slots along base tube center, and each arc clip slot is just arranged the deep-slotted chip breaker on a corresponding paw inwall, and each arc clip slot and a corresponding deep-slotted chip breaker clamping form a clamp hole for sandwiched cable;
The periphery wall of plug is axially arranged with three arc clip slots along base tube center, and each arc clip slot is just arranged the deep-slotted chip breaker on a corresponding paw inwall, and each arc clip slot and a corresponding deep-slotted chip breaker clamping form a clamp hole; Each radially-directed spacing hole comprises rectangle slide opening and anticreep slide opening, and rectangle slide opening is arranged on the edge of matrix slip pipe away from a side of gear platform, and form a breach, anticreep slide opening is communicated with rectangle slide opening; The limiting section that each paw guide runner portion is provided with the guide part being arranged in rectangle slide opening, the anti-delinking part being arranged in anticreep slide opening and is positioned at outside matrix slip pipe, threaded portion is driven to be arranged on the side end wall of anti-delinking part adjacent flat nut, the shape of anti-delinking part and anticreep slide opening adaptation; The periphery wall of each plane nut is provided with fastening part, and each plane nut is provided with flat thread portion away from a side of gear platform, and adaptation then engages with the driving threaded portion of three paws in corresponding a set of paw assembly in each flat thread portion; Each plane nut drives its flat thread portion reciprocating rotation, so by the driving threaded portion of its engagement adaptation drive three paws in corresponding a set of paw assembly towards slip pipe center close to each other or away from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097328.9A CN105551742A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097328.9A CN105551742A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105551742A true CN105551742A (en) | 2016-05-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610097328.9A Withdrawn CN105551742A (en) | 2016-01-15 | 2016-01-15 | Power zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105551742A (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 CN201610097328.9A patent/CN105551742A/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 | ||
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160504 |