CN105551731A - High and medium-voltage electric zero-sequence current transformer - Google Patents
High and medium-voltage electric zero-sequence current transformer Download PDFInfo
- Publication number
- CN105551731A CN105551731A CN201610097213.XA CN201610097213A CN105551731A CN 105551731 A CN105551731 A CN 105551731A CN 201610097213 A CN201610097213 A CN 201610097213A CN 105551731 A CN105551731 A CN 105551731A
- Authority
- CN
- China
- Prior art keywords
- plane nut
- paw
- plane
- slip pipe
- pressure claw
- 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- Withdrawn
Links
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
Abstract
The invention discloses a high and medium-voltage electric zero-sequence current transformer. The high and medium-voltage electric zero-sequence current transformer comprises a basal body, a plane nut, two sets of pressure claw assemblies, a core rod and a current transformer; the basal body is provided with a sliding tube and radial guide limiting holes; each pressure claw is positioned in a corresponding radial guide limiting hole; the plane nut sleeves the outer peripheral wall of the sliding tube of the basal body; two side ends of the plane nut are each provided with a plane threaded part; each plane threaded part is adaptive to a driving threaded part of each pressure claw in one set of adjacent pressure claw assemblies; the core rod is positioned in the cavity of the sliding tube of the basal body; a locating groove is arranged on the outer peripheral wall of the plane nut; the transformer is arranged in the locating groove; the plane nut is provided with a twisted fastening part on the outer peripheral wall at two sides of the locating groove respectively; and the plane nut drives the two plane threaded parts at two side ends of the plane nut to rotate in a reciprocating manner, such that various pressure claws in the two sets of pressure claw assemblies are synchronously driven to be close or far away towards the centre of the sliding tube. The current transformer disclosed by the invention 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 mesohigh 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 its application be subject to more restriction.
Summary of the invention
The object of this invention is to provide and be a kind ofly convenient to that location is installed, there is better firmness, effectively prevent the mesohigh electric power zero sequence current mutual inductor that loosens.
The technical scheme realizing the object of the invention is: a kind of mesohigh electric power zero sequence current mutual inductor, comprises matrix, plane nut, two casing pressure claw assemblies, a plug and a current transformer; Matrix is provided with slip pipe and is arranged on the radially-directed spacing hole on slip pipe; Each paw is arranged in a corresponding radially-directed spacing hole, and each paw is provided with and drives threaded portion; Plane nut sleeve is located on the periphery wall of matrix slip pipe, the both sides of two casing pressure claw assembly separation plane nuts; The two side ends of plane nut is respectively provided with a flat thread portion, and each flat thread portion is adaptive with the driving threaded portion of each paw in adjacent a set of paw assembly; Plane nut periphery wall is provided with a detent, and this instrument transformer is arranged in detent; Plane nut is respectively provided with one and twists fastening part on the periphery wall being positioned at these detent both sides; 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 a corresponding paw inwall, and the inwall clamping of each arc clip slot and a corresponding paw forms a clamp hole; Plane nut drives two flat thread portion reciprocating rotations of its two side ends, so synchronous drive each paw in two casing pressure claw assemblies towards slip pipe center close to each other or away from.
The present invention has positive effect: (1) the present invention synchronously drives two casing pressure claw assembly clamping electric power cables by a plane nut, 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 further for zero sequence current mutual inductor shown in Fig. 1.
Embodiment
(embodiment 1)
The present embodiment is a kind of mesohigh electric power zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 5, comprises matrix 1, plane nut 2, two casing pressure claw assembly, 3, plug 6 and a current transformer 7; Each casing pressure claw assembly comprises three paws 4; The radially-directed spacing hole 12 that matrix is provided with slip pipe 11 and is arranged on slip pipe; Radially-directed spacing hole runs through slip pipe tube wall along the radial direction of matrix slip pipe; Radially-directed spacing hole 12 is positioned at matrix slip pipe edges at two ends place axially;
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 plane nut 2 is ring-type, and plane nut sleeve is located on the periphery wall of matrix slip pipe 11, and between two casing pressure claw assemblies 3;
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.
The internal perisporium of plane nut is the smooth inner wall with matrix slip pipe periphery wall adaptation, the periphery wall of plane nut is provided with fastening part 21, plane nut is being provided with a flat thread portion 22 separately along matrix slip pipe two side ends axially, each flat thread portion is provided with archimedean spiral groove, and adaptation then engages with the driving threaded portion of three paws in adjacent a set of paw assembly in each flat thread portion; 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 the edge of matrix slip pipe, 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 adjacent flat nut, 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, thus make to drive threaded portion can not move in anticreep slide opening.
In the present embodiment, the direction of rotation in the flat thread portion of plane nut one side is forward, and the direction of rotation in the flat thread portion of another side is reverse, the direction of flat thread portion adaptation that the direction of rotation of the driving screw thread on each paw is and adjoins with this paw.When this structure makes plane nut rotation, by two flat thread portions of its two side ends, the synchronous two casing pressure claw assemblies that drive realize clamping or releases cable.
In the present embodiment, current transformer 7 is ring current transformer; Plane nut periphery wall is provided with a detent, and this current transformer is fixedly installed in detent, and plane fastening nuts portion is respectively provided with one and twists fastening part on the periphery wall being positioned at these detent both sides.
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 synchronously drive two casing pressure claw assemblies by driving with the driving threaded portion of its engagement adaptation, 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, 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. a mesohigh electric power zero sequence current mutual inductor, is characterized in that: comprise matrix, plane nut, two casing pressure claw assemblies, a plug and a current transformer; Matrix is provided with slip pipe and is arranged on the radially-directed spacing hole on slip pipe; Each paw is arranged in a corresponding radially-directed spacing hole, and each paw is provided with and drives threaded portion; Plane nut sleeve is located on the periphery wall of matrix slip pipe, the both sides of two casing pressure claw assembly separation plane nuts; The two side ends of plane nut is respectively provided with a flat thread portion, and each flat thread portion is adaptive with the driving threaded portion of each paw in adjacent a set of paw assembly; Plane nut periphery wall is provided with a detent, and this instrument transformer is arranged in detent; Plane nut is respectively provided with one and twists fastening part on the periphery wall being positioned at these detent both sides; 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 a corresponding paw inwall, and the inwall clamping of each arc clip slot and a corresponding paw forms a clamp hole; Plane nut drives two flat thread portion reciprocating rotations of its two side ends, so synchronous drive each paw in two casing pressure claw assemblies towards slip pipe center close to each other or away from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097213.XA CN105551731A (en) | 2016-01-15 | 2016-01-15 | High and medium-voltage electric zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097213.XA CN105551731A (en) | 2016-01-15 | 2016-01-15 | High and medium-voltage electric zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105551731A true CN105551731A (en) | 2016-05-04 |
Family
ID=55830861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610097213.XA Withdrawn CN105551731A (en) | 2016-01-15 | 2016-01-15 | High and medium-voltage electric zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105551731A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN203679326U (en) * | 2014-01-24 | 2014-07-02 | 华南理工大学 | Novel flexible four-jaw chuck |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
-
2016
- 2016-01-15 CN CN201610097213.XA patent/CN105551731A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917711U (en) * | 2012-11-13 | 2013-05-01 | 北京振兴计量测试研究所 | Fastening fixture for tail cover of electric connector |
| CN203679326U (en) * | 2014-01-24 | 2014-07-02 | 华南理工大学 | Novel flexible four-jaw chuck |
| CN204276947U (en) * | 2014-12-01 | 2015-04-22 | 温岭市深澳机床厂(普通合伙) | Scroll chuck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160504 |