CN105869865A

CN105869865A - Improved high-voltage current transformer

Info

Publication number: CN105869865A
Application number: CN201610286213.4A
Authority: CN
Inventors: 胡妍
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-05-02
Filing date: 2016-05-02
Publication date: 2016-08-17

Abstract

The invention discloses an improved high-voltage current transformer. The improved high-voltage current transformer comprises a base tube, a core tube, two pressing claw assemblies, two planar nuts and a current transformer body, wherein the base tube is sleeved with the current transformer body and provided with crimping bosses; radial limiting sliding holes are formed in the wall of the core tube, and a stop block is arranged on the inner circumferential wall of the core tube; the two planar nuts are rotationally arranged in a cavity of the core tube and located on two sides of the stop block; a driving thread part of each pressing claw assembly is located on one side, far away from the stop block, of the corresponding planar nut; each planar nut comprises a fastening part and a planar thread part meshed and matched with the driving thread part of each pressing claw of the corresponding pressing claw assembly; a mounting screw hole in which a temperature sensing device is arranged is formed in the base tube. The improved high-voltage current transformer has an excellent loosening prevention effect.

Description

A kind of improved high-voltage current transformer

Technical field

The invention belongs to technical field of electric power, be specifically related to a kind of improved high-voltage current transformer.

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, therefore makes its application by more restriction.

Summary of the invention

It is an object of the invention to provide a kind of be easily installed location, have real time temperature control function improved high-voltage electricity Current transformer.

The technical scheme realizing the object of the invention is: a kind of improved high-voltage current transformer, it is characterised in that: include one Individual base tube, core pipe, two casing pressure claw assemblies, two plane nuts and a current transformer；Current transformer is set in base Guan Shang；The internal perisporium of base tube is provided with crimping boss；Core pipe and base tube are arranged concentrically and are positioned at base tube tube chamber；On the tube wall of core pipe Being provided with the spacing slide opening of multiple radial direction, the internal perisporium of core pipe is provided with a gear platform；Each casing pressure claw assembly includes three paws, respectively presses Pawl includes pressing plate portion, the guide runner portion of the inwardly projecting formation of inwall from pressing plate portion and the driving being arranged on guide runner portion Threaded portion；Each pressing plate portion is positioned between base tube inwall and core tube wall, and each guide runner portion inserts a corresponding radial direction on core pipe In spacing slide opening, in each tube chamber driving threaded portion to stretch to core pipe；Each pressing plate portion and a corresponding crimping boss clamping are formed One clamp hole；Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation gear platforms；Each set The threaded portion that drives in paw assembly is respectively positioned on the corresponding plane nut side away from gear platform；Each plane nut includes fastening Portion and engage adaptive flat thread portion with the threaded portion that drives of each paw in corresponding a set of paw assembly；Each crimping boss Inwall is provided with arcuate groove；The outer wall in each paw pressing plate portion is provided with arc clip slot；The arc clip slot of each paw is just to corresponding one The arcuate groove of crimping boss is arranged, and the arcuate groove clamping of the arc clip slot of this paw and this crimping boss forms a clamp Hole；Base tube is provided with the installation screw of built-in temperature sensing device；Having that temperature sensing device includes that metal material makes is accommodating The metal shell of groove, the temperature sensor being arranged in storage tank, for temperature sensor is crimped on storage tank diapire Spring, screwed pipe plug for limit spring；

Metal shell is provided with heat conduction boss close to one end of core tube hub axis, and metal shell is away from one end of core tube hub axis It is provided with interior hexagonal and twists groove；The periphery wall of metal shell is provided with the external screw thread adaptive with installation screw, the internal perisporium of storage tank It is provided with internal threaded regions；Temperature sensor includes the heat-conducting block using heat conductive insulating elastomeric material to make, is arranged in heat-conducting block U-shaped thermo-sensitive resistor, be arranged on heat-conducting block two connect electric mortiser post；Heat-conducting block back and forth can be slided in the storage tank of metal shell Dynamic；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 and protrude and be arranged on and lead On the hot block other end away from core tube hub axis；Heat-conducting block is away from the external diameter of the other end of core tube hub axis and storage tank Enclosing formation cannelure between internal perisporium, spring is positioned in this cannelure and is set in heat-conducting block away from the one of core tube hub axis On end；Screwed pipe plug is provided with external screw thread district close to the periphery wall of one end of core tube hub axis, this external screw thread district and metal-back The internal threaded regions of body 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；Spiral shell The center of pipe plug is provided with tube chamber；Screwed pipe plug is fixedly installed in cannelure by its external screw thread district；Spring is close to core pipe One end of central axis is connected on heat-conducting block, and spring is connected on screwed pipe plug away from the other end of core tube hub axis；Lead Two on hot block connect in the tube chamber that electric mortiser post is positioned at screwed pipe plug.

Heat conduction boss is to protrude the sharp tooth boss formed close to one end of core tube hub axis from metal shell.

The present invention has positive effect: the improved high-voltage current transformer of (1) present invention is owing to carrying press claw type lock Tight mechanism, can directly be fixedly installed on cable, it is not necessary to reserved installation position, it is easy to install, and have preferable anti-loosening effect Really, firm intensity is relatively high and stable reliably.(2) present invention compares with by traditional bolt assembly clamping electric power cable, permissible Apply bigger pressure, and there is excellent anti-loosening effect, the reliability of long-term work is effectively ensured.(3) present invention adopts It is clamped on same cable with two casing pressure claw assemblies, there is the effect of dual fail-safe, in use go wrong even if the most a set of, Also has its service behaviour of another set of guarantee.(4) installation screw of pressure pipe portion wall body is extended radially through along base tube owing to base tube is provided with, peace Dress screw 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 structural representation；

Fig. 2 is a kind of perspective view when removing current transformer of the zero sequence current mutual inductor shown in Fig. 1；

Fig. 3 is a kind of front view of zero sequence current mutual inductor shown in Fig. 2；

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 when removing base tube of the zero sequence current mutual inductor shape shown in Fig. 2；

Fig. 7 is that the one of the second structure of the present invention partly cuts open structural representation；

Fig. 8 is the close-up schematic view in Fig. 7 at B；

Fig. 9 is that one when removing current transformer of the zero sequence current mutual inductor shown in Fig. 7 partly cuts open structural representation.

Detailed description of the invention

(embodiment 1)

The present embodiment is a kind of improved high-voltage current transformer, as shown in Fig. 1 to Fig. 6, including 1, core pipe of a base tube 2,3, two plane nuts 4 of two casing pressure claw assemblies and a current transformer 9.

The internal perisporium of base tube is axially arranged with three crimping boss 11 along base tube, and the inwall of each crimping boss is provided with arcuate groove 111；The internal perisporium of base tube is axially additionally provided with four positioning runners 12 along base tube；Core pipe and base tube are arranged concentrically and are positioned at base tube pipe Intracavity；The periphery wall of core pipe is provided with four support flanges 21 extended along core pipe radially protruding, each outboard end supporting flange It is positioned in a corresponding positioning runner, thus core pipe is supported in the tube chamber being positioned at base tube；The tube wall of core pipe is provided with six The most spacing slide opening 22, each radially spacing slide opening all extends radially through core tube wall along core pipe；The internal perisporium of core pipe be provided with to Three annular gear platforms 23 of projecting inward formation.

Each casing pressure claw assembly includes three paws 5；Every casing pressure claw assembly and a corresponding plane nut are adaptive；Each paw bag Include pressing plate portion 51, the guide runner portion 52 of the inwardly projecting formation of inwall from pressing plate portion and the driving being arranged on guide runner portion Threaded portion 53；Pressing plate portion is axially extending along base tube, and guide runner portion radially extends along core pipe；Set on the outer wall in each paw pressing plate portion There is arc clip slot 511；Each pressing plate portion is positioned between base tube inwall and core tube wall, and each guide runner portion inserts on core pipe corresponding one In the spacing slide opening of individual radial direction, in each tube chamber driving threaded portion to stretch to core pipe；Each paw is in the guiding limit of radially spacing slide opening Under the effect of position, the radial direction along core pipe reciprocatingly slides.

In the present embodiment, the radial cross-sectional shape of each radially spacing hole is I-shaped, the radial section in each guide runner portion Shape is adaptive with radial direction spacing hole I-shaped；In concrete practice, radially spacing hole and the radial section in guide runner portion Shape also can be selected for other shape, such as circle, rectangle, square, as long as having radially-directed and limit effect.

In the present embodiment, the arcuate groove of a corresponding crimping boss is just arranged by the arc clip slot of each paw, and this paw Arc clip slot and this crimping boss arcuate groove clamping formed a clamp hole 6, each clamp hole for clamping one electric lines of force Cable；The present embodiment forms three clamp holes, altogether three electric power cables of clamping altogether.Owing to three electric power cables are from matrix slip pipe tube chamber In pass, current transformer can carry out zero-sequence current detection by induction mode to three electric power cables, finds in time Leakage current fault, and send real time information to distance host by wireless transmit/receive units, provide for power circuit intellectuality Basic data.In the present embodiment, current transformer 9 is ring current transformer, and this ring current transformer is set in outside base tube On wall.In concrete practice, also can arrange detent on the outer wall of base tube, current transformer is positioned in this detent, So that current transformer is more firm.In the present embodiment, the size in each clamp hole can be different, is used for clamping difference The cable of thickness.

Two plane nuts all rotate and are arranged in core pipe tube chamber, the both sides of two plane nut separation annular gear platforms；Respectively The threaded portion that drives in casing pressure claw assembly is respectively positioned on the corresponding plane nut side away from annular gear platform；Each plane nut Periphery wall and core inside pipe wall slide adjacent, and the center of each plane nut is provided with fastening part 42；One side of each plane nut and Annular gear platform slides adjacent, and another side is provided with and engages adaptation with the threaded portion that drives of each paw in corresponding a set of paw assembly Flat thread portion 41；Flat thread portion is annular, and flat thread portion is provided with archimedean spiral groove；The driving of each paw assembly The thread groove that threaded portion is provided with and this archimedean spiral groove is adaptive, it is adjacent that each driving threaded portion is arranged on guide runner portion, place Connect a side of plane nut.

The fastening part of the present embodiment midplane nut is interior hexagonal shape fastener hole or interior hexagonal shape binding groove, and it twists operation Use inner hexagon spanner；In concrete practice, described fastening part just can use other shape, the most square or in-line or Flos Mume Shape, all can select.

In the present embodiment, each plane nut, when reciprocating rotation, drives its flat thread portion reciprocating rotation, so by with In the corresponding a set of paw assembly of driving threaded portion driving that the engagement of this flat thread portion is adaptive, each paw moves, owing to each paw exists Under the guide and limit effect of the most spacing slide opening, the radial direction only along core pipe moves back and forth, so that in each casing pressure claw assembly The move mode of paw be close to each other towards core tube hub or away from, thus unclamp or clamp the electric power being positioned in each clamp hole Cable.

The present embodiment gravity centre distribution is relatively reasonable, when on the overhead power line of high-altitude, is conducive to alleviating vibration；Separately Outward, the present embodiment drives paw clamping electric power cable by flat thread portion, and by traditional bolt assembly clamping electric lines of force Cable is compared, particularly excellent in anti-loosening effect, and the reliability of long-term work is effectively ensured.It addition, the present embodiment passes through Same cable is used two casing pressure claw assembly clampings, there is the effect of dual fail-safe, in use go wrong even if the most a set of, Also has its service behaviour of another set of guarantee.

The present embodiment can use as high pressure zero sequence current mutual inductor, for detecting the existence of leakage current, with in time Find leak current fault.

(embodiment 2)

The present embodiment and embodiment 1 are essentially identical, and difference is: as shown in Fig. 7 to Fig. 9, and the electric current in the present embodiment is mutual Sensor 9 includes toroidal inductive body 91 and intelligent control module 92；The monnolithic case of intelligent control module is also annular；Annular sense Body 91 and intelligent control module 92 is answered to be disposed side by side on the outer wall of base tube.

Base tube 1 is provided with the installation screw 15 extending radially through base tube 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 92 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, multiple installation screw and temperature sensing device can be set on base tube, for each Cable and the temperature with base tube junction monitor in real time, thus realize the further intellectuality that power network monitoring runs.

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. an improved high-voltage current transformer, it is characterised in that: include a base tube, core pipe, two casing pressure claw assemblies, Two plane nuts and a current transformer；Current transformer is set on base tube；The internal perisporium of base tube is provided with crimping boss； Core pipe and base tube are arranged concentrically and are positioned at base tube tube chamber；The tube wall of core pipe is provided with the spacing slide opening of multiple radial direction, core pipe interior Perisporium is provided with a gear platform；Each casing pressure claw assembly includes three paws, each paw include pressing plate portion, inwall from pressing plate portion to The guide runner portion of projecting inward formation and the driving threaded portion being arranged in guide runner portion；Each pressing plate portion be positioned at base tube inwall and Between core tube wall, each guide runner portion inserts on core pipe in a corresponding spacing slide opening of radial direction, and each driving threaded portion stretches to In the tube chamber of core pipe；Each pressing plate portion and a corresponding crimping boss clamping form a clamp hole；Two plane nuts all rotate It is arranged in core pipe tube chamber, the both sides of two plane nut separation gear platforms；Driving threaded portion in each casing pressure claw assembly is respectively positioned on A corresponding plane nut is away from the side of gear platform；Each plane nut includes fastening part and each with corresponding a set of paw assembly The flat thread portion driving threaded portion engagement adaptation of paw；The inwall of each crimping boss is provided with arcuate groove；Each paw pressing plate portion Outer wall be provided with arc clip slot；The arcuate groove of a corresponding crimping boss is just arranged by the arc clip slot of each paw, and this pressure The arcuate groove clamping of the arc clip slot of pawl and this crimping boss forms a clamp hole；Base tube is provided with built-in temperature sensing device Installation screw；Temperature sensing device includes the metal shell with storage tank that metal material makes, is arranged in storage tank Temperature sensor, the spring for temperature sensor is crimped on storage tank diapire, the screwed pipe plug that is used for limit spring；

Improved high-voltage current transformer the most according to claim 1, it is characterised in that: heat conduction boss is from metal shell The sharp tooth boss formed is protruded in one end close to core tube hub axis.