CN105742013A - Three-phase zero-sequence current transformer with relatively good anti-looseness performance - Google Patents
Three-phase zero-sequence current transformer with relatively good anti-looseness performance Download PDFInfo
- Publication number
- CN105742013A CN105742013A CN201610093474.4A CN201610093474A CN105742013A CN 105742013 A CN105742013 A CN 105742013A CN 201610093474 A CN201610093474 A CN 201610093474A CN 105742013 A CN105742013 A CN 105742013A
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- CN
- China
- Prior art keywords
- radially
- paw
- current transformer
- traveller
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
- F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two or more members engaging the pipe, cable or protective tubing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/38—Instruments transformers for polyphase ac
-
- 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
- H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a three-phase zero-sequence current transformer with relatively good anti-looseness performance. The three-phase zero-sequence current transformer comprises a compression ring, a core tube, a core rod, a current transformer body and press claw components, wherein the compression ring is rotationally arranged on the outer circumference wall of the core tube; the compression ring comprises a ratchet ring provided with a plurality of slope grooves; a plurality of wedge-shaped anti-drop teeth are arranged in the slope grooves; a plurality of radial guide holes are formed in the tube wall of the core tube; each press claw component comprises at least three press claws and reset springs; each press claw comprises a press plate part and a radial slide column; wedge-shaped teeth are arranged at the outer side ends of the radial slide columns; the press plate parts of the press claws are located in a tube cavity of the core tube; each radial slide column passes through one radial guide hole; each wedge-shaped tooth abuts on one corresponding wedge-shaped anti-drop tooth; the core rod is located in the tube cavity of the core tube; at least three arc-shaped clamping grooves are formed in the core rod; each arc-shaped clamping groove and one corresponding arc-shaped groove are clamped to form a wire clamping hole; the current transformer body is provided with an annular base body; and the wire clamping holes are located in a hole cavity of the annular base body. The three-phase zero-sequence current transformer has relatively good electrical performance.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to the three-phase zero sequence current mutual inductor of a kind of anti-loosening better performances.
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 three-phase zero sequence current mutual inductor of the anti-loosening better performances loosened.
The technical scheme realizing the object of the invention is: the three-phase zero sequence current mutual inductor of a kind of anti-loosening better performances, including pressure ring, core pipe, plug, current transformer and paw assembly；Pressure ring rotates and is arranged on core pipe periphery wall；Pressure ring includes internal perisporium and is provided with the spine ring of multiple slopes groove；Each slope groove is provided with multiple wedge shape anticreep tooth；Core tube wall is provided with multiple radially-directed hole；Paw assembly includes at least three paw and provides the back-moving spring of reseting elasticity for each paw；Each paw includes pressing plate portion and the radial direction traveller being arranged on pressing plate portion outer wall；The outboard end of each radially traveller is provided with the chisel teeth adaptive with the wedge shape anticreep tooth in the groove of spine ring slope；The pressing plate portion of each paw is arranged in core pipe tube chamber, and the radial direction traveller of each paw is through the corresponding radially-directed hole on core tube wall, under the elastic force effect of back-moving spring, on the wedge shape anticreep tooth in a corresponding slope groove of the chisel teeth apical grafting on each radially traveller；Each radially-directed hole includes accommodating hole and the guiding slide opening of connection；Guiding slide opening in each radially traveller and radially-directed hole is adaptive, each radially traveller under the position-limiting action of guiding slide opening along core caliber to reciprocatingly sliding；Each back-moving spring is set on a corresponding radial direction traveller；Being fixed with mat on each radially traveller, the outer end of each back-moving spring is connected in this mat, and the inner of each back-moving spring is connected on the diapire of accommodating hole；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with at least three arc clip slot, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole；Current transformer is provided with annular matrix, and each clamp hole is respectively positioned in the vestibule of annular matrix.
Due to the fact that there is thread clamping mechanism, therefore be easily installed location；Additionally each paw is positioned by the present invention by having the slope groove of wedge shape anticreep tooth, the technique effect preventing from falling back can be played, 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.
Accompanying drawing explanation
Fig. 1 is a kind of perspective view of the first structure of the present invention；
Fig. 2 is that shown in Fig. 1, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 3 is the A-A sectional view of Fig. 2；
Fig. 4 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 1；
Fig. 5 is a kind of perspective view that zero sequence current mutual inductor shown in Fig. 1 moves core pipe；
The one that Fig. 6 is the second structure of the present invention partly cuts open structural representation；
Fig. 7 is a kind of perspective view of zero sequence current mutual inductor core pipe shown in Fig. 6；
The one that Fig. 8 is figure the third structure of the present invention partly cuts open structural representation.
Detailed description of the invention
(embodiment 1)
The present embodiment is the three-phase zero sequence current mutual inductor of a kind of anti-loosening better performances, sees shown in Fig. 1 to Fig. 5, including a pressure ring 2, four paw assemblies of 1, core pipe, 4, plug 7 of 3, axial back-up ring and a current transformer 8.
Pressure ring 1 includes spine ring 11, separation two clamping connection rings 12 of spine ring both sides and multiple connecting rivet 13, two clamping connection ring clamping spine rings, connecting rivet axially penetrates through described spine ring and two clamping connection rings along core pipe, thus spine ring and two clamping connection rings are fixedly connected into an entirety.The internal perisporium of spine ring is provided with multiple slopes groove 111, is provided with multiple wedge shape anticreep tooth 112 in the groove of each slope；In the present embodiment, the internal perisporium of spine ring and the internal perisporium of clamping connection ring are coplanar, and the periphery wall of spine ring and the periphery wall of clamping connection ring are coplanar；The periphery wall of pressure ring is provided with multiple binding groove 14 axially penetrating through whole pressure ring along core pipe, and the operation of twisting of pressure ring adopts hook type spanner (being commonly called as hook spanner).In concrete practice, the internal diameter of clamping connection ring also can be slightly smaller than the internal perisporium of spine ring.Slope groove in the present embodiment refer to depth of groove pass through gradually be incremented by groove.
The periphery wall of core pipe 2 is provided with the annular gear platform 21 of evagination and the annular groove 22 of indent, and core pipe is provided with multiple radially-directed hole 23 on the tube wall kept off in annular between platform and annular groove；In the present embodiment, each radially-directed hole extends radially through core tube wall along core pipe, each radially-directed hole includes accommodating hole 231 and the guiding slide opening 232 of connection, accommodating hole and guiding slide opening set gradually along direction from outside to inside, accommodating hole and guiding slide opening are all circular holes, the aperture of accommodating hole is more than the aperture of guiding slide opening, and the cross sectional shape in each radially-directed hole is T-shaped.Axial back-up ring is arranged in the annular groove of core pipe.Pressure ring rotates and is arranged on core pipe periphery wall, and the two side ends of pressure ring keeps off platform respectively with annular and axially back-up ring slip is adjacent.
Paw assembly 3 includes multiple paw 31, provides the back-moving spring 32 of reseting elasticity and the mat 33 being fixedly installed on each paw for paw；Each paw includes pressing plate portion 311, be arranged on pressing plate portion outer wall radial direction traveller 312, the annular slot 313 being arranged on radially traveller periphery wall；Guiding slide opening in each radially traveller and radially-directed hole is adaptive, each radially traveller under the position-limiting action of guiding slide opening along core caliber to reciprocatingly sliding；The outboard end of each radially traveller is provided with chisel teeth 34；Wedge shape anticreep tooth in each chisel teeth and spine ring slope groove is adaptive.Each mat is fixed in the annular slot of a corresponding radial direction traveller, each back-moving spring is set on a corresponding radial direction traveller, each back-moving spring is connected in a corresponding annular mat along core caliber outer end upwards, and back-moving spring is connected on the diapire of accommodating hole along core caliber the inner upwards；
The pressing plate portion of each paw is arranged in core pipe tube chamber, the radial direction traveller of each paw is through the corresponding radially-directed hole on core tube wall, under the elastic force effect of back-moving spring, on the wedge shape anticreep tooth in a corresponding slope groove of spine ring of the chisel teeth apical grafting on each radially traveller.Under the position-limiting action of slope groove and chisel teeth, the pressure ring in the present embodiment is twisted only along a direction, has anti-retrogression namely anti-loosening technique effect.
The inwall in each paw pressing plate portion is provided with arcuate groove 314.
Plug 7 is arranged in core pipe tube chamber；The periphery wall of plug is provided with multiple arc clip slot 71, and each arc clip slot is axially extending along core pipe, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole 5；So the present embodiment can form four clamp holes, can be used for simultaneously clamping on four cables.
The periphery wall of plug is provided with four the support location flanges 72 protruded along core pipe radial direction, the internal perisporium of core pipe is provided with four positioning runners 24, each outboard end supporting location flange is embedded in a corresponding positioning runner, thus plug is positioned in the tube chamber of matrix slip pipe.
Current transformer includes annular matrix 81 and intelligent control module 82；Annular matrix is fixedly installed on a clamping connection ring；In the present embodiment, a clamping connection ring is provided with installation gap 121 at a side of adjacent spine ring, and annular matrix is inlaid in this installation gap.
The present embodiment forms four clamp holes altogether, and during use, wherein three clamp holes respectively clamp a phase line cable, and another one folder hole is as standby.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 this 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.
The present embodiment is when operation, hook type spanner is adopted to twist pressure ring, pressure ring is made to drive the wedge shape anticreep tooth in its slope groove to rotate, owing to each back-moving spring stress can deform shortening, make the chisel teeth of each pressing plate radially traveller towards the shallower side shifting of groove depth in the groove of slope, and then make the pressing plate portion of each paw along the radially-inwardly sliding of core pipe, thus clamping is arranged in the electric power cable in clamp hole.
Additionally, each paw is positioned by the present embodiment by having the slope groove of wedge shape anticreep tooth, it is possible to play the technique effect preventing from falling back, and compares with by traditional bolt assembly clamping electric power cable, in anti-loosening effect particularly excellent, be effectively ensured the reliability of long-term work.
(embodiment 2)
The present embodiment and embodiment 1 are essentially identical, are different in that: see shown in Fig. 6 and Fig. 7, it addition, the periphery wall of core pipe is provided with resettlement groove 25, intelligent control module is arranged in resettlement groove；Intelligent control module can include wireless transmit/receive units；This structure can make full use of space, is conducive to the small-sized and integrated of entirety.
(embodiment 3)
The present embodiment and embodiment 1 are essentially identical, it is different in that: as shown in Figure 8, the present embodiment is no longer arranged on the annular matrix of voltage transformer in clamping connection ring, in the present embodiment, the annular matrix of voltage transformer is fixedly installed on core pipe periphery wall, this scheme is also feasible, and structure is compacter and easily fabricated processing；As long as allowing in a word by folder electric power cable traverse annular matrix.
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. the three-phase zero sequence current mutual inductor of an anti-loosening better performances, it is characterised in that: include pressure ring, core pipe, plug, current transformer and paw assembly；Pressure ring rotates and is arranged on core pipe periphery wall；Pressure ring includes internal perisporium and is provided with the spine ring of multiple slopes groove；Each slope groove is provided with multiple wedge shape anticreep tooth；Core tube wall is provided with multiple radially-directed hole；Paw assembly includes at least three paw and provides the back-moving spring of reseting elasticity for each paw；Each paw includes pressing plate portion and the radial direction traveller being arranged on pressing plate portion outer wall；The outboard end of each radially traveller is provided with the chisel teeth adaptive with the wedge shape anticreep tooth in the groove of spine ring slope；The pressing plate portion of each paw is arranged in core pipe tube chamber, and the radial direction traveller of each paw is through the corresponding radially-directed hole on core tube wall, under the elastic force effect of back-moving spring, on the wedge shape anticreep tooth in a corresponding slope groove of the chisel teeth apical grafting on each radially traveller；Each radially-directed hole includes accommodating hole and the guiding slide opening of connection；Guiding slide opening in each radially traveller and radially-directed hole is adaptive, each radially traveller under the position-limiting action of guiding slide opening along core caliber to reciprocatingly sliding；Each back-moving spring is set on a corresponding radial direction traveller；Being fixed with mat on each radially traveller, the outer end of each back-moving spring is connected in this mat, and the inner of each back-moving spring is connected on the diapire of accommodating hole；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with at least three arc clip slot, and the arcuate groove on a corresponding paw inwall is just arranged by each arc clip slot；Each arc clip slot and a corresponding arcuate groove clamping form a clamp hole；Current transformer is provided with annular matrix, and each clamp hole is respectively positioned in the vestibule of annular matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610093474.4A CN105742013A (en) | 2016-01-15 | 2016-01-15 | Three-phase zero-sequence current transformer with relatively good anti-looseness performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610093474.4A CN105742013A (en) | 2016-01-15 | 2016-01-15 | Three-phase zero-sequence current transformer with relatively good anti-looseness performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105742013A true CN105742013A (en) | 2016-07-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610093474.4A Withdrawn CN105742013A (en) | 2016-01-15 | 2016-01-15 | Three-phase zero-sequence current transformer with relatively good anti-looseness performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105742013A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN103490350A (en) * | 2013-10-08 | 2014-01-01 | 国家电网公司 | Peeling and cutting tool for outer semi-conducting layer of crosslinked power cable |
| CN204884841U (en) * | 2015-08-17 | 2015-12-16 | 广东腾达电力科技有限公司 | Undercurrent route selection is high accuracy opening CT for device |
-
2016
- 2016-01-15 CN CN201610093474.4A patent/CN105742013A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793486Y (en) * | 2005-03-28 | 2006-07-05 | 郑春开 | Clasp cable device |
| CN103490350A (en) * | 2013-10-08 | 2014-01-01 | 国家电网公司 | Peeling and cutting tool for outer semi-conducting layer of crosslinked power cable |
| CN204884841U (en) * | 2015-08-17 | 2015-12-16 | 广东腾达电力科技有限公司 | Undercurrent route selection is high accuracy opening CT for 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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160706 |