CN106098343A - Zero sequence current mutual inductor for power circuit - Google Patents
Zero sequence current mutual inductor for power circuit Download PDFInfo
- Publication number
- CN106098343A CN106098343A CN201610280330.XA CN201610280330A CN106098343A CN 106098343 A CN106098343 A CN 106098343A CN 201610280330 A CN201610280330 A CN 201610280330A CN 106098343 A CN106098343 A CN 106098343A
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- China
- Prior art keywords
- core pipe
- crimp
- plate portion
- paw
- radially
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-
- 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
- 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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
-
- 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
- H01F2038/305—Constructions with toroidal magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a kind of zero sequence current mutual inductor for power circuit, including core pipe, current transformer, two top pressure bolts, two set crimp assemblies and two casing pressure claw assemblies；The tube wall of core pipe is provided with two groups of pilot holes, and each group pilot hole includes at least three radially-directed slide opening；Core pipe tube chamber is provided with two internal threaded regions；Each set crimp assemblies includes at least three crimp；Each crimp is provided with pressing plate portion and anticreep connecting portion；Crimp is arranged on core pipe by anticreep connecting portion is dismountable；Each paw includes top plate portion, guide runner portion and drive surface；Crimp assemblies and paw assembly form at least three clamp hole altogether；Current transformer includes toroidal inductive body；Each clamp hole is respectively positioned in the vestibule of toroidal inductive body；At least one crimp is provided with the installation screw of built-in temperature sensing device.The present invention is easily installed location, has preferable firmness.
Description
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of zero sequence current mutual inductor for power circuit.
Background technology
The ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flow into the telegram in reply of any node in circuit
The algebraical sum of stream is equal to zero.In the case of circuit and electrical equipment are normal, the vector of each phase current is equal to zero, therefore, zero
The secondary side winding no signal output of sequence current transformer, executive component is failure to actuate.When occurring to get an electric shock or each during leak current fault
The vector of phase current is not zero, and fault current makes to produce in the iron core of zero sequence current mutual inductor magnetic flux, zero sequence current mutual inductor
Produced electric current is zero-sequence current.When protection mechanism receives this zero sequence current signal, can take accordingly according to electrical leakage quantity
Protection act.Mostly the mounting means of existing zero sequence current mutual inductor is to use flange install fixing or use bonding mode solid
Fixed, its installation site is it is generally required to reserve, so that the application of zero sequence current mutual inductor is by more restriction.
Summary of the invention
It is an object of the invention to provide a kind of be easily installed location and have real time temperature control function for electric lines of force
The zero sequence current mutual inductor on road.
The technical scheme realizing the object of the invention is: a kind of zero sequence current mutual inductor for power circuit, and its feature exists
In: include a core pipe, current transformer, two top pressure bolts, two set crimp assemblies and two casing pressure claw assemblies；Core pipe
Tube wall is provided with two groups of pilot holes, and each group pilot hole includes at least three radially-directed slide opening；Core pipe tube chamber is provided with in two
Threaded area；Each set crimp assemblies includes at least three crimp；Each crimp is provided with pressing plate portion and anticreep connecting portion；Crimp leads to
Cross that anticreep connecting portion is dismountable to be arranged on core pipe；Each casing pressure claw assembly includes at least three paw；Each paw includes top board
Portion, from the guide runner portion of the inwardly projecting formation of the inwall of top plate portion and the drive surface that is arranged on guide runner portion；Each guiding
Slide section is inserted on core pipe in a corresponding radially-directed slide opening, and each drive surface stretches in the tube chamber of core pipe, each top board position
Between core inside pipe wall and core tube wall；A corresponding crimp pressing plate portion is just arranged by the top plate portion of each paw, this top plate portion
One is formed for the clamp hole clamping electric power cable with this pressing plate portion clamping；Crimp assemblies and paw assembly form at least three altogether
Individual clamp hole；Current transformer includes toroidal inductive body；Each clamp hole is respectively positioned in the vestibule of toroidal inductive body；Two tops
Pressure bolt is positioned at the two side ends of core pipe；Each top pressure bolt includes body, be arranged on body peripheral wall external screw thread district and setting
Top belling platform on body medial extremity, that pushes up belling platform is shaped as circular cone shape；The pressure external screw thread district of bolt, top and core pipe
Internal threaded regions is adaptive；In each casing pressure claw assembly, the drive surface of each paw and the periphery wall of a corresponding top belling platform are adaptive；Each top
Pressure bolt also includes the fastening part being arranged on outer body end；Each fastening part is hexagonal shape fastener head；Each top belling platform is along core pipe
Axially extending, and be positioned in core pipe tube chamber；The drive surface of each paw be one and the adaptive curved surface of top belling platform periphery wall or
Inclined-plane；Multiple radially-directed slide openings in each group pilot hole are evenly distributed on core tube wall along core pipe circumference；Each radially-directed
Slide opening all extends radially through core tube wall along core pipe；The inwall of a corresponding crimp is just arranged by each radially-directed slide opening；Respectively
Paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of radially-directed slide opening；Each top pressure bolt turns along preset direction
Time dynamic, driving top belling platform to rotate and advance in core pipe tube chamber, each top belling platform presses a corresponding casing pressure by top
Drive surface in claw assembly promotes each paw so that each top plate portion in this casing pressure claw assembly is moved radially outward along core pipe, from
And clamp and be positioned at the electric power cable in each clamp hole；
At least one crimp is provided with the installation screw of built-in temperature sensing device；Temperature sensing device includes that metal material is made
The metal shell with storage tank, the temperature sensor being arranged in storage tank, accommodating for temperature sensor is crimped on
Spring in groove bottom wall and the screwed pipe plug for limit spring.
The present invention has positive effect: the zero sequence current mutual inductor of (1) present invention is owing to carrying the paw that can clamp cable
Formula retaining mechanism, can directly be fixedly installed on cable, it is not necessary to reserved installation position, it is easy to install.(2) top pressure bolt and core pipe
Connecting threadably, and make it clamp electric power cable by the taper electrolysis each paw of crimping, its operation is the most laborsaving, and tool
There is preferable anti-loosening effect.(3) present invention uses two casing pressure claw assemblies to be clamped on same cable, the folder of each casing pressure claw assembly
Tight operation can individually be carried out, and this structure has the effect of double shield, in use goes wrong even if the most a set of, also
There is its service behaviour of another set of guarantee.(4) extend radially through the installation screw in pressing plate portion along core pipe owing to crimp is provided with, spiral shell is installed
Hole is fixed with temperature sensing device；So the present invention also has real time temperature control function.
Accompanying drawing explanation
Fig. 1 is that the one of the first structure of the present invention partly cuts open schematic diagram；
Fig. 2 is a kind of perspective view after zero sequence current mutual inductor shown in figure removes current transformer；
Fig. 3 is that shown in Fig. 2, the one of zero sequence current mutual inductor faces structural representation；
Fig. 4 is that shown in Fig. 2, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 5 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 2；
Fig. 6 is a kind of explosive view after zero sequence current mutual inductor shown in Fig. 2 removes crimp and top pressure bolt；
Fig. 7 is that the one of the second structure of the present invention partly cuts open structural representation；
Fig. 8 is a kind of structural representation of zero sequence current mutual inductor shown in Fig. 7；
Fig. 9 is that the one of the third structure of the present invention partly cuts open structural representation；
Figure 10 is the close-up schematic view in Fig. 9 at B；
Figure 11 is that the one after zero sequence current mutual inductor shown in Fig. 9 removes current transformer partly cuts open structural representation；
Figure 12 is that the one of the 4th kind of structure of the present invention partly cuts open structural representation.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of zero sequence current mutual inductor for power circuit, as shown in Fig. 1 to Fig. 7, including a core pipe 2,
Two top pressure bolt 1, two set 3, current transformers of crimp assemblies 7 and two casing pressure claw assemblies 9.
In the present embodiment, core pipe 2, crimp assemblies 3 and two casing pressure claw assemblies 9 are all adopted and are made from an insulative material.
The tube wall of core pipe is provided with two groups of pilot holes, and these two groups of pilot holes are axially arranged side by side along core pipe；Respectively organize pilot hole
Including four radially-directed slide openings 22, these four radially-directed slide openings are evenly distributed on core tube wall along core pipe circumference；Each footpath
All core tube wall is extended radially through along core pipe to guiding slide opening；The cross sectional shape of each radially-directed slide opening is I-shaped.Core pipe pipe
Chamber is provided with two internal threaded regions 23.
Each set crimp assemblies 3 all includes four crimps 31；Each crimp is provided with pressing plate portion 311 and anticreep connecting portion 312；
Crimp is arranged on core pipe by anticreep connecting portion is dismountable；Pressing plate portion is axially extending along core pipe, and the inwall in pressing plate portion sets
Having arcuate groove 313, the periphery wall in pressing plate portion is circular arc；Anticreep connecting portion is to protrude inwardly from the two of formation from pressing plate portion two side ends
Individual post plate 314, the radial cross-sectional shape of each post plate is L-shaped；In the present embodiment, two L-shaped post plates are oppositely arranged.
Each group pilot hole and corresponding a set of crimp assemblies are adaptive, and each each radially-directed slide opening organized in guiding is just to corresponding one
The inwall of a crimp in set crimp assemblies is arranged.
Four groups it are provided with vertically for the anticreep chute 21 installing location crimp on the periphery wall of core pipe；Respectively organize anti-skid
Groove includes that two radial sections are the axial slides 211 of L-shaped；In the present embodiment, two adjacent axial slides are oppositely arranged；Respectively
Axial slide and a corresponding post plate are adaptive；The anticreep connecting portion of each crimp along core pipe axial direction from corresponding set of anti-skid
One side of groove slips in this group anticreep chute；In concrete practice, anticreep connecting portion can select other shape, as long as making
The anticreep connecting portion obtaining crimp can not remove along core caliber to from anticreep chute；In concrete practice, it is possible to select
Snap fit installs fixing each crimp；Multiple draw-in groove is such as set on the periphery wall of core pipe, each pressing plate is arranged inwardly
Prominent clamping support column or clamping gripper shoe, directly snap in a corresponding draw-in groove by each clamping support column or clamping gripper shoe
In, also can prevent shackle member from removing core pipe along core pipe radial direction, this structure is also feasible.
In the present embodiment, the crimp in each set crimp assemblies is identical with the quantity of the paw in each casing pressure claw assembly.
In concrete practice, the cross sectional shape of radially-directed slide opening may be used without other shape, the most circular, square, Pedicellus et Pericarpium Trapae
Shape, is all feasible.
Each casing pressure claw assembly 9 all includes four paws 4；Each paw includes top plate portion 41, from the inwall of top plate portion to convex
Go out the guide runner portion 42 formed and the drive surface 43 being arranged in guide runner portion；Top plate portion is axially extending along core pipe, guides
Slide section radially extends along core pipe；The outer wall of each paw top plate portion is provided with arc clip slot 411；Each guide runner portion inserts core pipe
In a upper corresponding radially-directed slide opening, each drive surface stretches in the tube chamber of core pipe, and each top plate portion is positioned at core inside pipe wall and core
Between pipe outer wall；Each paw reciprocatingly slides along the radial direction of core pipe under the guide and limit effect of radially-directed slide opening；Respectively guide cunning
The cross sectional shape in block portion is adaptive with radially-directed slide opening I-shaped.
The arcuate groove in a corresponding crimp pressing plate portion is just arranged by the arc clip slot of each paw top plate portion, this arc clip slot
Forming a clamp hole 5 with this arcuate groove clamping, each clamp hole is for one electric power cable of clamping.In concrete practice, respectively press
The size of fitting can be different, and the distance between arcuate groove and the core tube wall in the most each pressing plate portion is different, such that it is able to formed
The clamp hole varied in size, for clamping the cable of different thicknesses.
The present embodiment forms four clamp holes altogether, can clamp four electric power cables；But as zero sequence current mutual inductor
During use, only three phase line cables of gripping.In concrete practice, it is possible to the present embodiment is made the knot only with three clamp holes
Structure.
Two top pressure bolts are positioned at the two side ends of core pipe；Each top pressure bolt 1 includes body 11, is arranged on body peripheral wall
External screw thread district 12, the fastening part 13 being arranged on outer body end and the top belling platform 14 being arranged on body medial extremity, top pressure
Boss be shaped as circular cone shape；The external screw thread district of top pressure bolt and the internal threaded regions of core pipe are adaptive；Top belling platform is along core pipe
Axially extending, and be positioned in core pipe tube chamber.
In the present embodiment, each top pressure bolt and a corresponding paw assembly are adaptive, and the drive surface of each paw is and corresponding one
The curved surface that individual top belling platform periphery wall is adaptive, preferably has the curved surface of tapering；In concrete practice, this drive surface also can be selected for
Flat bevel.
In the present embodiment, in each casing pressure claw assembly, the quantity of paw, each quantity overlapping crimp in crimp assemblies and each group are led
In hole, the quantity of radially-directed slide opening is identical.
Current transformer includes toroidal inductive body 71 and intelligent control module 72；In the present embodiment, intelligent control module
72 make and have the ring-type of onesize vestibule with toroidal inductive body, and annular perception sensing body and intelligent control module are side by side
Arranging combination and form annular, on the overall sheathed outer wall being fixed on each pressing plate portion of current transformer, namely crimp assemblies is positioned at electricity
In the vestibule that current transformer is overall.In concrete practice, current transformer also can be fixedly installed on the tube wall of core pipe, as long as making
Obtain all clamp holes to be positioned in the vestibule of toroidal inductive body, namely have only to so that cable passes toroidal inductive body
Vestibule.
Intelligent control module can include wireless transmit/receive units, and intelligent control module is felt annular by wireless transmit/receive units
The leakage current signal answering body to sense sends distance host to, to realize accurate long-range no worker monitor, finds in time Lou
Electric fault.The present embodiment can use as a zero sequence current mutual inductor.
The present embodiment, in order to promote chuck strength, is also provided with multiple puncture 6 in each arcuate groove and arc clip slot；Concrete next
Saying, each puncture is along the radially protruding in core pipe portion.
In the present embodiment, each paw is the integral piece made by injection mo(u)lding, and each puncture is made when injection mo(u)lding；?
In concrete practice, puncture may be used without alternate manner and makes；In each arcuate groove, such as it is provided with multiple installation draw-in groove, then adopting
The puncture sheet being made from an insulative material is inlaid in corresponding one and installs in draw-in groove；Puncture sheet and include installation portion and thorn blade, install
Portion is inlaid in installation draw-in groove, and thorn blade then exposes installation draw-in groove and forms puncture.In concrete practice, it is also possible to use respectively
The mode being threaded in arc clip slot and arcuate groove, also can improving clamping sigma compactness energy.
Each top pressure bolt along preset direction rotate time, drive top belling platform to rotate and go in core pipe tube chamber
Entering, each top belling platform presses the drive surface in corresponding a set of paw assembly to promote paw by top so that in this casing pressure claw assembly
Each top plate portion is moved radially outward along core pipe, thus clamping is positioned at the electric power cable in each clamp hole.
The present embodiment has following Advantageous Effects: (1) top pressure bolt and core pipe connect threadably, and by top
Belling platform pushes the drive surface of each paw, and then promotes each paw to move along core pipe radial direction；Its operation is the most laborsaving, and
There is preferable anti-loosening effect.(2) it is to be arranged on core pipe by sliding due to crimp, first cable can be placed in each pressure
In the arc clip slot of pawl, more corresponding crimp is loaded in corresponding anticreep chute, corresponding electric power cable can be placed in
In clamp hole；This structure makes to clamp the easy to operation of electric power cable.
(embodiment 2)
The present embodiment and embodiment 1 are essentially identical, and difference is: as shown in Fig. 7 to Fig. 8, in the present embodiment, and annular perception
On the sensing sheathed periphery wall being fixed on pressing plate portion of body；Between core tube wall, crimp outer wall and toroidal inductive inner body wall
Clamping forms multiple containing cavity 73, and intelligent control module is arranged in containing cavity.This structure can make full use of space, favorably
In overall small-sized and integrated.
(embodiment 3)
The present embodiment and embodiment 1 are essentially identical, and difference is: as shown in Fig. 9 to Figure 11, and at least one crimp 31 sets
There is the installation screw 315 extending radially through pressing plate portion 311 wall body along core pipe；This installation screw is fixed with a temperature sensing dress
Put 8.
Temperature sensing device 8 includes the metal shell 81 with storage tank 811 that metal material makes, is arranged on storage tank
In temperature sensor 82, the spring 83 for temperature sensor is crimped on storage tank diapire, the spiral shell that is used for limit spring
Pipe plug 84.
Metal shell is provided with as puncturing the heat conduction boss 813 used, metal-back close to one end 812 of core tube hub axis
Body is provided with interior hexagonal away from one end 814 of core tube hub axis and twists groove 815；The periphery wall of metal shell is provided with and installs spiral shell
The external screw thread 816 that hole is adaptive, the internal perisporium of storage tank is provided with internal threaded regions 817；Heat conduction boss is close to core from metal shell
The sharp tooth boss formed is protruded in one end 812 of tube hub axis.
Temperature sensor includes using the heat-conducting block 821 that heat conductive insulating elastomeric material is made, the U-shaped being arranged in heat-conducting block
Thermo-sensitive resistor 822, two be arranged on heat-conducting block connect electric mortiser post 823；Heat-conducting block can be reciprocal in the storage tank of metal shell
Slide；Heat-conducting block is connected on the diapire of storage tank close to one end of core tube hub axis；Two connect electric mortiser post protrusion and are arranged on
On the heat-conducting block other end away from core tube hub axis；
Heat-conducting block encloses formation cannelure between external diameter and the internal perisporium of storage tank away from the other end of core tube hub axis
100, spring is positioned in this cannelure and is set on heat-conducting block one end away from core tube hub axis；
Screwed pipe plug is provided with external screw thread district 841 close to the periphery wall of one end of core tube hub axis, this external screw thread district and metal
The internal threaded regions 817 of housing is adaptive；Screwed pipe plug is provided with outer-hexagonal away from the periphery wall of one end of core tube hub axis and twists
Portion 842；The center of screwed pipe plug is provided with tube chamber 843；Screwed pipe plug is fixedly installed in cannelure by its external screw thread district；
Spring is connected on heat-conducting block close to one end of core tube hub axis, and spring abuts away from the other end of core tube hub axis
On screwed pipe plug；On heat-conducting block two connect electric mortiser post and are positioned in the tube chamber 843 of screwed pipe plug.
The internal perisporium of intelligent control module 72 is provided with inwardly projecting two and connects electric bushing (being not drawn on figure), respectively connects electricity
Socket inserts corresponding one and connects in electric bushing, so that temperature sensor is connected with the middle control circuit in intelligent control module.
This structure has the following advantages, owing to metal shell is easily deformed when extruding cable, and extrusion temperature sensor
Heat-conducting block, if heat-conducting block does not has mobile space, then easily pressurized deformation damages；The present embodiment, can by arranging spring
Heat-conducting block is crimped on the diapire of metal shell storage tank so that it is can correctly predict cable and junction, pressing plate pressing plate portion
Real time temperature；Can also be when, after metal shell compressive deformation, reserving mobile space to heat-conducting block, thus prevent heat-conducting block by pressurized
Damage；This structure has preferably Practical Performance.
In concrete practice, at least one installation screw and a temperature sensing dress can be respectively provided with on each crimp
Put, for each cable and and the temperature of crimp junction monitor in real time, thus realize what power network monitoring ran
The most intelligent.
(embodiment 4)
The present embodiment and embodiment 2 are essentially identical, and difference is: as shown in Figure 12, and at least one crimp 31 is provided with edge
Core pipe extends radially through the installation screw 315 of pressing plate portion 311 wall body；This installation screw is fixed with a temperature sensing device 8.
Temperature sensing device 8 includes the metal shell 81 with storage tank 811 that metal material makes, is arranged on storage tank
In temperature sensor 82, the spring 83 for temperature sensor is crimped on storage tank diapire, the spiral shell that is used for limit spring
Pipe plug 84.
Metal shell is provided with as puncturing the heat conduction boss 813 used, metal-back close to one end 812 of core tube hub axis
Body is provided with interior hexagonal away from one end 814 of core tube hub axis and twists groove 815；The periphery wall of metal shell is provided with and installs spiral shell
The external screw thread 816 that hole is adaptive, the internal perisporium of storage tank is provided with internal threaded regions 817；Heat conduction boss is close to core from metal shell
The sharp tooth boss formed is protruded in one end 812 of tube hub axis.
Temperature sensor includes using the heat-conducting block 821 that heat conductive insulating elastomeric material is made, the U-shaped being arranged in heat-conducting block
Thermo-sensitive resistor 822, two be arranged on heat-conducting block connect electric mortiser post 823；Heat-conducting block can be reciprocal in the storage tank of metal shell
Slide；Heat-conducting block is connected on the diapire of storage tank close to one end of core tube hub axis；Two connect electric mortiser post protrusion and are arranged on
On the heat-conducting block other end away from core tube hub axis；
Heat-conducting block encloses formation cannelure between external diameter and the internal perisporium of storage tank away from the other end of core tube hub axis
100, spring is positioned in this cannelure and is set on heat-conducting block one end away from core tube hub axis；
Screwed pipe plug is provided with external screw thread district 841 close to the periphery wall of one end of core tube hub axis, this external screw thread district and metal
The internal threaded regions 817 of housing is adaptive；Screwed pipe plug is provided with outer-hexagonal away from the periphery wall of one end of core tube hub axis and twists
Portion 842；The center of screwed pipe plug is provided with tube chamber 843；Screwed pipe plug is fixedly installed in cannelure by its external screw thread district；
Spring is connected on heat-conducting block close to one end of core tube hub axis, and spring abuts away from the other end of core tube hub axis
On screwed pipe plug；On heat-conducting block two connect electric mortiser post and are positioned in the tube chamber 843 of screwed pipe plug.
The internal perisporium of intelligent control module 72 is provided with inwardly projecting two and connects electric bushing (being not drawn on figure), respectively connects electricity
Socket inserts corresponding one and connects in electric bushing, so that temperature sensor is connected with the middle control circuit in intelligent control module.
This structure has the following advantages, owing to metal shell is easily deformed when extruding cable, and extrusion temperature sensor
Heat-conducting block, if heat-conducting block does not has mobile space, then easily pressurized deformation damages；The present embodiment, can by arranging spring
Heat-conducting block is crimped on the diapire of metal shell storage tank so that it is can correctly predict cable and junction, pressing plate pressing plate portion
Real time temperature；Can also be when, after metal shell compressive deformation, reserving mobile space to heat-conducting block, thus prevent heat-conducting block by pressurized
Damage；This structure has preferably Practical Performance.
In concrete practice, at least one installation screw and a temperature sensing dress can be respectively provided with on each crimp
Put, for each cable and and the temperature of crimp junction monitor in real time, thus realize what power network monitoring ran
The most intelligent.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, the most also may be used
To make other changes in different forms.Here without also cannot all of embodiment be given exhaustive.And these
Belong to obvious change that the connotation of the present invention extended out or variation still falls within protection scope of the present invention.
Claims (1)
1. the zero sequence current mutual inductor for power circuit, it is characterised in that: include a core pipe, a Current Mutual Inductance
Device, two top pressure bolts, two set crimp assemblies and two casing pressure claw assemblies；The tube wall of core pipe is provided with two groups of pilot holes, leads for each group
At least three radially-directed slide opening is included to hole；Core pipe tube chamber is provided with two internal threaded regions；Each set crimp assemblies includes at least
Three crimps；Each crimp is provided with pressing plate portion and anticreep connecting portion；Crimp is arranged on by anticreep connecting portion is dismountable
On core pipe；Each casing pressure claw assembly includes at least three paw；Each paw includes top plate portion, from the inwardly projecting shape of the inwall of top plate portion
The guide runner portion become and the drive surface being arranged in guide runner portion；Each guide runner portion inserts a corresponding radial direction on core pipe
Guiding in slide opening, each drive surface stretches in the tube chamber of core pipe, and each top plate portion is between core inside pipe wall and core tube wall；Each pressure
A corresponding crimp pressing plate portion is just arranged by the top plate portion of pawl, and this top plate portion and this pressing plate portion clamping form one and be used for clamping
The clamp hole of electric power cable；Crimp assemblies and paw assembly form at least three clamp hole altogether；Current transformer includes annular sense
Answer body；Each clamp hole is respectively positioned in the vestibule of toroidal inductive body；Two top pressure bolts are positioned at the two side ends of core pipe；Respectively push up pressure
Bolt includes body, be arranged on body peripheral wall external screw thread district and the top belling platform being arranged on body medial extremity, top pressure
Boss be shaped as circular cone shape；The external screw thread district of top pressure bolt and the internal threaded regions of core pipe are adaptive；In each casing pressure claw assembly respectively
The drive surface of paw and the periphery wall of a corresponding top belling platform are adaptive；Each top pressure bolt also includes being arranged on outer body end
Fastening part；Each fastening part is hexagonal shape fastener head；Axially extending along core pipe of each top belling platform, and be positioned in core pipe tube chamber；Respectively
The drive surface of paw is one and pushes up the adaptive curved surface of belling platform periphery wall or inclined-plane；Multiple radially-directeds in each group pilot hole
Slide opening is evenly distributed on core tube wall along core pipe circumference；Each radially-directed slide opening all extends radially through core tube wall along core pipe；
The inwall of a corresponding crimp is just arranged by each radially-directed slide opening；Each paw is in the guide and limit effect of radially-directed slide opening
The lower radial direction along core pipe reciprocatingly slides；Each top pressure bolt along preset direction rotate time, drive top belling platform rotate to
In core pipe tube chamber and advance, each top belling platform presses the drive surface in corresponding a set of paw assembly to promote each paw by top so that
Each top plate portion in this casing pressure claw assembly is moved radially outward along core pipe, thus clamping is positioned at the electric power cable in each clamp hole；
At least one crimp is provided with the installation screw of built-in temperature sensing device；Temperature sensing device includes the tool that metal material is made
Have the metal shell of storage tank, the temperature sensor being arranged in storage tank, for temperature sensor is crimped at the bottom of storage tank
Spring on wall and the screwed pipe plug for limit spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610280330.XA CN106098343A (en) | 2016-05-02 | 2016-05-02 | Zero sequence current mutual inductor for power circuit |
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| CN201610280330.XA CN106098343A (en) | 2016-05-02 | 2016-05-02 | Zero sequence current mutual inductor for power circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
| CN105355406A (en) * | 2015-11-24 | 2016-02-24 | 广东电网有限责任公司电力科学研究院 | Opening current transformer capable of being installed in powered-on mode |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607681A (en) * | 2013-11-03 | 2015-05-13 | 西安志越机电科技有限公司 | Thin-wall round pipe turning and clamping device |
| CN105355406A (en) * | 2015-11-24 | 2016-02-24 | 广东电网有限责任公司电力科学研究院 | Opening current transformer capable of being installed in powered-on mode |
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