CN105761895A - Three-phase power zero sequence current transformer - Google Patents
Three-phase power zero sequence current transformer Download PDFInfo
- Publication number
- CN105761895A CN105761895A CN201610099101.8A CN201610099101A CN105761895A CN 105761895 A CN105761895 A CN 105761895A CN 201610099101 A CN201610099101 A CN 201610099101A CN 105761895 A CN105761895 A CN 105761895A
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- China
- Prior art keywords
- paw
- ring
- core pipe
- current transformer
- pressing
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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 a three-phase power zero sequence current transformer.The three-phase power zero sequence current transformer comprises a pressing ring, a core tube, a cord rod, a current transformer and two wire clamping assemblies.The pressing ring is rotationally arranged on the peripheral wall of the core tube and comprises a ratchet ring with the inner circumferential wall provided with a plurality of slope grooves; a plurality of wedge-shaped anti-disengaging teeth are in the slope grooves; a plurality of radial guiding holes are formed in the tube wall of the core tube; a pressing claw assembly comprises a plurality of pressing claws and a rest spring; each pressing claw comprises a pressing plate part and a radial sliding column; wedge-shaped teeth are arranged at the outer side ends of the radial sliding columns; the pressing plate parts of the pressing claws are located in a tube cavity of the core tube, the radial sliding columns penetrate one radial guiding hole, and the wedge-shaped teeth are connected to the corresponding wedge-shaped anti-disengaging teeth in an ejecting mode; the core rod is located in the tube cavity of the core tube; the current transformer is provided with an annular base body, and wire clamping holes are located in a hole cavity of the annular base body; when the ratchet ring rotates, the pressing plate parts in the two wire clamping assemblies are driven to move to the center of the core tube.The three-phase power zero sequence current transformer has good electric performance.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of three-phase power 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 three-phase power zero sequence current mutual inductor that loosens.
The technical scheme realizing the object of the invention is: a kind of three-phase power zero sequence current mutual inductor, including a pressure ring, a core pipe, a plug, a current transformer and two set wire clipping components；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 multiple paw and provides the back-moving spring of reseting elasticity for paw；Each set wire clipping component includes along the core pipe equally distributed multiple paw assemblies of circumference；Two set wire clipping components are axially arranged side by side along core pipe；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；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with at least three arc clip slot, 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；Current transformer is provided with annular matrix, and each clamp hole is respectively positioned in the vestibule of annular matrix；Accommodating hole and guiding slide opening set gradually along direction from outside to inside, and accommodating hole and guiding slide opening are all circular holes, and 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；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 axially penetrating through whole pressure ring along core pipe；Drive wedge shape anticreep tooth to rotate when spine ring rotates, by pushing up the radial direction traveller pressing each paw, synchronize to drive each pressing plate portion in two set wire clipping components to move towards core tube hub.
The present invention has positive effect: the 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) originally can apply bigger pressure, and there is the anti-loosening effect of excellence, be effectively ensured the reliability of long-term work.(3) the present embodiment is by adopting two set wire clipping components clamping electric power cables, a set of is out of order, and another set of still can ensure that work, has the technique effect of dual fail-safe.
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 explosive view after zero sequence current mutual inductor shown in Fig. 1 removes pressure ring and back-up ring；
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 the third structure of the present invention partly cuts open structural representation.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of three-phase power zero sequence current mutual inductor, sees shown in Fig. 1 to Fig. 5, including the axial back-up ring 4 of 1, core pipe of a pressure ring, 7, current transformer of 2, plug 8, two and two set wire clipping components 9.
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 refers to the groove that depth of groove is incremented by gradually to another side from a side.
The periphery wall of core pipe 2 is provided with the annular groove 22 of two indents, and core pipe is provided with multiple radially-directed hole 23 on the tube wall between two annular grooves；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.Each axial back-up ring is arranged in a corresponding annular groove of core pipe.Pressure ring rotates and is arranged on core pipe periphery wall, and respectively with two axial back-up rings of the two side ends of pressure ring slide adjacent.
Each set wire clipping component includes along the core pipe equally distributed multiple paw assemblies 3 of circumference, and the present embodiment selects four, in concrete practice, can select between two to five.Two set wire clipping components are axially provided adjacent to side by side along core pipe.In the present embodiment, the multiple paw assemblies 3 in each set wire clipping component form a clamp hole 5 for clamping.
Each paw assembly 3 includes back-moving spring 32 and the mat being fixedly installed on each paw 33 that a paw 31, is paw offer reseting elasticity；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；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；This structure makes the present embodiment can use as a high-voltage mutual inductor.
In concrete practice, no matter annular matrix is fixed on where, as long as making clamp hole be arranged in the vestibule of annular matrix, as long as namely allowing by folder electric power cable traverse annular matrix.
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 the radially traveller of each pressing plate in two set wire clipping components towards the shallower side shifting of groove depth in the groove of slope, and then make the pressing plate portion in two set wire clipping components along the radially-inwardly sliding of core pipe, so that two set wire clipping component synchronous clampings are arranged in the electric power cable in clamp hole.
The present embodiment is by being arranged on cable clamping at the longitudinal center line place of zero sequence current mutual inductor, and its gravity centre distribution is relatively reasonable, when on the overhead power line of high-altitude, is conducive to alleviating vibration；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.Additionally, the present embodiment is by adopting two set wire clipping components clamping electric power cables, a set of it is out of order, another set of still can ensure that work, there is the technique effect of dual fail-safe.
(embodiment 2)
The present embodiment and embodiment 1 are essentially identical, are different in that: see shown in Fig. 6 and Fig. 7, and the current transformer 8 in the present embodiment also includes intelligent control module 82；The periphery wall of core pipe is provided with resettlement groove 25, and intelligent control module is arranged in resettlement groove；Intelligent control module can include wireless transmit/receive units and alarm buzzer, and secondary voltage or current signal that intelligent control module is sensed annular matrix by wireless transmit/receive units send distance host to, to realize the long-range no worker monitor of precision；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 2 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 current transformer in clamping connection ring, in the present embodiment, the annular matrix of current transformer is fixedly installed on core pipe periphery wall, this scheme is also feasible, and structure is compacter and easily fabricated processing.
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 three-phase power zero sequence current mutual inductor, it is characterised in that: include a pressure ring, a core pipe, a plug, a current transformer and two set wire clipping components；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 multiple paw and provides the back-moving spring of reseting elasticity for paw；Each set wire clipping component includes along the core pipe equally distributed multiple paw assemblies of circumference；Two set wire clipping components are axially arranged side by side along core pipe；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；Plug is arranged in core pipe tube chamber；The periphery wall of plug is provided with at least three arc clip slot, 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；Current transformer is provided with annular matrix, and each clamp hole is respectively positioned in the vestibule of annular matrix；Accommodating hole and guiding slide opening set gradually along direction from outside to inside, and accommodating hole and guiding slide opening are all circular holes, and 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；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 axially penetrating through whole pressure ring along core pipe；Drive wedge shape anticreep tooth to rotate when spine ring rotates, by pushing up the radial direction traveller pressing each paw, synchronize to drive each pressing plate portion in two set wire clipping components to move towards core tube hub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099101.8A CN105761895A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610099101.8A CN105761895A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero sequence current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN105761895A true CN105761895A (en) | 2016-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610099101.8A Pending CN105761895A (en) | 2016-01-15 | 2016-01-15 | Three-phase power zero sequence current transformer |
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| Country | Link |
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| CN (1) | CN105761895A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202387980U (en) * | 2011-10-31 | 2012-08-22 | 苏州市东立机械有限公司 | Novel three-jaw chuck |
| 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 CN201610099101.8A patent/CN105761895A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202387980U (en) * | 2011-10-31 | 2012-08-22 | 苏州市东立机械有限公司 | Novel three-jaw chuck |
| 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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| PB01 | Publication | ||
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Application publication date: 20160713 |