CN114038669A

CN114038669A - Current transformer easy to assemble

Info

Publication number: CN114038669A
Application number: CN202111391598.8A
Authority: CN
Inventors: 邓治胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-02-11

Abstract

The invention belongs to the field of current transformers, and particularly relates to a current transformer convenient to install, which comprises an annular transformer, a baffle plate A, an arc plate B, a baffle plate B, an outer sleeve, an inner rod, an arc plate C and the like, wherein three arc plates B which are uniformly distributed in the circumferential direction and have the same central axis are respectively installed on a round rod through connecting plates B, a forked arc plate A for supporting cables entering in the radial direction is installed in a space between any two adjacent connecting plates B, and the three arc plates A are uniformly distributed in the circumferential direction; the cable fixing device can finish the fixed installation of the cable on the cable under the condition that the cable which is installed or is in a working state is not disconnected, and has the advantages of convenient and quick operation, less operation procedures and higher installation efficiency. In addition, the cables entering the movable groove are clamped and fixed through the two fork-shaped arc plates in the movable groove, so that the three-phase cable clamp can be suitable for three-phase cables with different diameters, and has a wider application range.

Description

Current transformer easy to assemble

Technical Field

The invention belongs to the field of current transformers, and particularly relates to a current transformer convenient to install.

Background

Kirchhoff's current law states that: the sum of all currents into a node is equal to the sum of all currents out of the node. I.e. assuming that the current into a node is positive and the current out of this node is negative, the algebraic sum of all currents referring to this node is equal to zero.

The zero sequence current transformer based on kirchhoff's current law is used for power protection equipment, and is used in cooperation with a relay protection device or a signal when a power system generates zero sequence grounding current, so that elements of the device act, and protection or monitoring is realized. When an electric shock or leakage fault occurs in the circuit, the secondary side of the mutual inductor outputs zero-sequence current, so that equipment on the connected secondary line is protected (power supply is cut off, alarm and the like).

Most of the existing zero sequence current transformers are fixedly installed on a cable in a flange or bonding mode, and the installation position of the zero sequence current transformer needs to be reserved on the cable, so that the use of the zero sequence current transformer is limited, and the installation efficiency is low. In addition, a better fixed mounting method is designed in an improved high-voltage current transformer disclosed in the published patent No. 201610282090.7, but the disclosed structure cannot be mounted on the existing installed electric wire, that is, the working electric wire cannot pass through the clamping device on the circuit transformer without disconnecting.

The invention designs a current transformer which is convenient to install and solves the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses a current transformer convenient to install, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A current transformer convenient to install comprises an annular transformer, a baffle plate A, a plate spring, a round rod, arc plates A, a fixing plate B, arc plates B, a volute spring, a baffle plate B, an outer sleeve, an inner rod, a reset spring, arc plates C and connecting rods, wherein the three arc plates B which are uniformly distributed in the circumferential direction and have the same central axis are respectively installed on the round rod through connecting plates B; one side wall of each arc plate B is hinged with an arc baffle B for opening and closing a gap between the arc plate B and the adjacent arc plate B through two round pins B parallel to the round rod; the baffle B and the two corresponding arc plates B which are in a closed state at the gap between the two adjacent arc plates B form a complete arc plate which has the same central axis with the round rod; and two vortex springs which can swing and reset the corresponding baffle B are symmetrically arranged on each arc plate B.

The inner side of each baffle B is hinged with two symmetrical outer sleeves which are distributed at intervals along the axial direction of the round rod, and each outer sleeve forms a parallelogram four-bar linkage with the corresponding arc plate B and the baffle B through a connecting rod; an inner rod is arranged in each outer sleeve in a sliding mode, and a fork-shaped arc plate C which is matched with the corresponding arc plate A and used for pressing and fixing the cable in the arc plate A is arranged at the tail end of the inner rod; each outer sleeve is provided with a return spring for returning the corresponding inner rod.

The outer sides of the three arc plates B are rotatably matched with an annular transformer; an arc-shaped baffle A for opening and closing the annular transformer is hinged to an opening of the annular transformer through two round pins A, and the baffle A in a closed state of the opening and the annular transformer form a complete zero-sequence current transformer; the central axis of the round pin A and the central axis of any round pin B are positioned on the same ring surface of the same central axis of the round rod; and a plate spring for swinging and resetting the baffle A is arranged on the outer side of the annular transformer.

A structure which enables the round pin A and the corresponding round pin B to be concentric with the central axis and enables the round pin A and the corresponding round pin B to be synchronously opened and closed is arranged between each baffle B and the baffle A; the baffle A and the annular transformer are provided with structures for locking the baffle A to the closed state of the opening on the annular transformer.

As a further improvement of the technology, the two round pins A are symmetrically and fixedly arranged at two ends of the baffle A, and the two round pins A are respectively in rotating fit with two lugs A arranged at two ends of the annular transformer; the baffle A is provided with an arc surface B which is concentric with the round pin A and has an axis, and the annular transformer is provided with an arc surface A which is concentric with the round pin A and is in contact fit with the arc surface B; the outer side of the baffle A is provided with a manual shifting plate; one end of the plate spring is connected with the shifting plate, and the other end of the plate spring is connected with the outer side of the annular transformer. The ring protrusion B on the inner side of the baffle A and the ring protrusion A on the inner side of the ring transformer rotate in the ring groove D on the outer side of the baffle B and the ring groove C on the outer side of the arc plate B, and only relative rotation between the baffle A and the ring transformer as well as between the arc plate B and the baffle B is ensured.

As a further improvement of the technology, one end of the outer sleeve is hinged between two support lugs D on the inner side of the corresponding baffle B; one end of the connecting rod is hinged between the two support lugs E on the corresponding outer sleeve, and the other end of the connecting rod is hinged between the two support lugs F on the inner side of the corresponding arc plate B; two symmetrical support lugs C are arranged at two ends of the baffle B, two round pins B with the same central axis are fixedly arranged on the two support lugs C respectively, and the two round pins B are in rotary fit with the two support lugs B at two ends of the corresponding arc plate B respectively; two volute springs for resetting the baffle B are respectively nested on the corresponding round pins B and are respectively positioned in the ring grooves E on the corresponding support lugs B; one end of the volute spring is connected with the inner wall of the corresponding annular groove E, and the other end of the volute spring is connected with the corresponding round pin B.

As a further improvement of the technology, the inner rod is symmetrically provided with two guide blocks which respectively slide in two guide grooves on the inner wall of the corresponding outer sleeve. The cooperation of guide block and guide way plays the guide effect to the slip of interior pole in the overcoat, guarantees simultaneously that interior pole can not break away from the overcoat under reset spring's effect, keeps reset spring's the continuous compression state. The return spring is a compression spring; one end of the reset spring is connected with the inner wall of the corresponding outer sleeve, and the other end of the reset spring is connected with the end face of the corresponding inner rod; the arc plate A is fixedly connected with the round rod through the fixing plate A so as to increase the radial motion amplitude of the corresponding arc plate C along the round rod.

As a further improvement of the technology, the outer side of the annular transformer is hinged with a locking block; a bolt is matched with the L seat fixedly arranged on the outer side of the baffle A through threads, and the bolt is matched with a round hole in the locking block; the nut of the bolt is provided with anti-skid insections which are convenient for manual knob.

As a further improvement of the technology, each baffle B is symmetrically provided with two V-shaped elastic clamping plates which are axially distributed at intervals along a round rod, and each clamping plate is movable in a ring groove B on the inner side of the baffle A and a ring groove A on the inner side of the ring transformer; each clamping plate is matched with a clamping block arranged in a clamping groove on the inner wall of the corresponding sliding groove B.

As a further improvement of the technology, the baffle A is internally provided with an iron core B matched with the unclosed annular iron core A in the annular transformer; when the baffle A is in a closed state for the annular transformer, the insulating layer on the outer surface of the baffle A is tightly connected with the insulating layer on the outer surface of the annular transformer, and the iron core B in the baffle A is tightly connected with the iron core A in the annular transformer to form a complete annular iron core.

Compared with the traditional zero sequence current transformer, the zero sequence current transformer can be directly installed at any position on the installed cable without flanges or bonding modes, the installation position of the zero sequence current transformer is not required to be reserved on the cable, and the installation efficiency is high. Meanwhile, compared with the improved high-voltage current transformer with the published patent number of 201610282090.7, the high-voltage current transformer can finish the fixed installation on the cable under the condition that the cable which is installed or is in a working state is not disconnected, and has the advantages of convenient and fast operation, less operation procedures and higher installation efficiency. In addition, the cables entering the movable groove are clamped and fixed through the two fork-shaped arc plates in the movable groove, so that the three-phase cable clamp can be suitable for three-phase cables with different diameters, and has a wider application range. The invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of the present invention.

FIG. 2 is a schematic cross-sectional view of the arc plate A, the arc plate C, the inner rod, the outer sleeve, the baffle B, the arc plate B, the clamping plate, the ring transformer and the baffle A in cooperation.

FIG. 3 is a schematic cross-sectional view of the fixture block, the baffle A, the clamping plate, the baffle B and the arc plate B.

FIG. 4 is a schematic cross-sectional view of the baffle B, the support lug C, the round pin B, the support lug B, the arc plate B, the baffle A, the round pin B and the support lug A.

FIG. 5 is a cross-sectional view of the baffle B, the support lug C, the round pin B, the volute spring, the support lug B and the arc plate B.

Fig. 6 is a schematic view of the circular rod, the fixed plate a, the arc plate a, the fixed plate B and the arc plate B.

Fig. 7 is a schematic view of the baffle B from two viewing angles.

Fig. 8 is a schematic cross-sectional view of the outer sleeve, the inner rod and the arc plate C.

Fig. 9 is a schematic cross-sectional view of the ring transformer in cooperation with a baffle a.

Fig. 10 is a schematic cross-sectional view of a ring transformer and its associated components.

Fig. 11 is a schematic sectional view of a baffle plate a and a part thereof.

Number designation in the figures: 1. a ring transformer; 2. an opening; 3. a ring groove A; 4. the ring is convex A; 5. an arc surface A; 6. an iron core A; 7. a coil winding; 8. a current monitoring module; 9. a signal transmitting module; 10. a lug A; 11. a locking block; 12. a baffle A; 13. a ring groove B; 14. a card slot; 15. b, annular protrusion; 16. an iron core B; 17. a round pin A; 18. an L seat; 19. a bolt; 20. dialing a plate; 21. a clamping block; 22. a plate spring; 23. a round bar; 24. fixing a plate A; 25. an arc plate A; 26. a fixing plate B; 27. an arc plate B; 28. a ring groove C; 29. a lug B; 30. a ring groove E; 31. a baffle B; 32. a ring groove D; 33. a lug C; 34. a round pin B; 35. clamping a plate; 36. a lug D; 37. a jacket; 38. a guide groove; 39. a lug E; 40. an inner rod; 41. a guide block; 42. an arc plate C; 43. a lug F; 44. a connecting rod; 45. an arc surface B; 46. a return spring; 47. and a volute spring.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1 and 2, the device comprises an annular transformer 1, a baffle a12, a plate spring 22, a round bar 23, an arc plate a25, a fixing plate B26, an arc plate B27, a volute spring 47, a baffle B31, an outer sleeve 37, an inner bar 40, a return spring 46, an arc plate C42 and a connecting rod 44, wherein as shown in fig. 2 and 6, three arc plates B27 which are uniformly distributed in the circumferential direction and have the same central axis are respectively installed on the round bar 23 through connecting plates B, forked arc plates a25 which support cables entering in the radial direction are installed in spaces between any two adjacent connecting plates B, and the three arc plates a25 are uniformly distributed in the circumferential direction; as shown in fig. 2, 6 and 7, one side wall of each arc plate B27 is hinged with an arc baffle B31 for opening and closing a gap between the arc baffle B31 and the adjacent arc plate B27 through two round pins B34 parallel to the round rod 23; as shown in fig. 1 and 2, the baffle B31 and the two corresponding arc plates B27, which are in a closed state to the gap between two adjacent arc plates B27, form a complete arc plate concentric with the circular rod 23; as shown in fig. 4, each arc plate B27 is symmetrically provided with two volute springs 47 for swinging and returning to the corresponding baffle B31.

As shown in fig. 1, 2 and 4, the inner side of each baffle B31 is hinged with two symmetrical outer sleeves 37 which are distributed at intervals along the axial direction of the round rod 23, and each outer sleeve 37 forms a parallelogram four-bar linkage 44 mechanism with the corresponding arc plate B27 and the baffle B31 through the connecting rod 44; as shown in fig. 2, 6 and 8, each outer sleeve 37 has an inner rod 40 sliding therein, and the end of the inner rod 40 is provided with a fork-shaped arc plate C42 which is matched with the corresponding arc plate a25 and presses and fixes the cable in the arc plate a 25; each outer sleeve 37 has a return spring 46 therein for returning the respective inner rod 40.

As shown in fig. 1, 2 and 4, the outer sides of the three arc plates B27 are rotatably matched with a ring transformer 1; as shown in fig. 4, 9 and 10, an arc-shaped baffle a12 for opening and closing the opening 2 of the ring transformer 1 is hinged to the opening 2 of the ring transformer 1 through two round pins a17, and the baffle a12 for closing the opening 2 and the ring transformer 1 form a complete zero-sequence current transformer; as shown in fig. 1, 4 and 9, the central axis of the round pin a17 and the central axis of any round pin B34 are located on the same ring surface with the same central axis of the round rod 23; and a plate spring 22 which swings and resets the baffle A12 is arranged on the outer side of the ring transformer 1.

As shown in fig. 2 and 3, each baffle B31 and the baffle a12 have a structure which makes the round pin a17 and the corresponding round pin B34 concentric with the central axis and can synchronously switch the round pin a17 and the corresponding round pin B34; as shown in fig. 9, 10, and 11, the barrier a12 and the ring transformer 1 have a structure for locking the barrier a12 in a closed state of the opening 2 of the ring transformer 1.

As shown in fig. 4, 10 and 11, the two round pins a17 are symmetrically and fixedly installed at two ends of the baffle a12, and the two round pins a17 are respectively and rotatably matched with two support lugs a10 installed at two ends of the ring transformer 1; as shown in fig. 9, 10 and 11, the baffle a12 has an arc surface B45 concentric with the round pin a17, and the ring transformer 1 has an arc surface a5 concentric with the round pin a17 and in contact fit with the arc surface B45; the outer side of the baffle A12 is provided with a manual shifting plate 20; one end of the plate spring 22 is connected with the dial plate 20, and the other end is connected with the outer side of the ring transformer 1. As shown in fig. 4, 6 and 10, the ring protrusion B15 inside the baffle a12 and the ring protrusion a4 inside the ring transformer 1 rotate in the ring groove D32 outside the baffle B31 and the ring groove C28 outside the arc plate B27, so that only relative rotation between the baffle a12 and the ring transformer 1 and between the arc plate B27 and the baffle B31 is ensured.

As shown in fig. 2 and 7, one end of the outer sleeve 37 is hinged between two lugs D36 on the inner side of the corresponding baffle B31; as shown in fig. 2, 6 and 8, one end of the connecting rod 44 is hinged between two lugs E39 on the corresponding outer sleeve 37, and the other end is hinged between two lugs F43 on the inner side of the corresponding arc plate B27; as shown in fig. 4, 6 and 7, two symmetrical support lugs C33 are arranged at two ends of the baffle B31, two round pins B34 with the same central axis are respectively and fixedly arranged on the two support lugs C33, and the two round pins B34 are respectively and rotatably matched with the two support lugs B29 at two ends of the corresponding arc plate B27; as shown in fig. 4 and 5, the two volute springs 47 for returning the baffle B31 are respectively nested on the two corresponding round pins B34 and respectively located in the ring grooves E30 on the corresponding support lugs B29; one end of the volute spring 47 is connected with the inner wall of the corresponding ring groove E30, and the other end is connected with the corresponding round pin B34.

As shown in fig. 8, two guide blocks 41 are symmetrically installed on the inner rod 40, and the two guide blocks 41 respectively slide in the two guide grooves 38 on the inner wall of the corresponding outer sleeve 37. The cooperation of the guide block 41 and the guide groove 38 guides the sliding of the inner rod 40 in the outer sleeve 37, and simultaneously ensures that the inner rod 40 cannot be separated from the outer sleeve 37 under the action of the return spring 46, and the continuous compression state of the return spring 46 is maintained. The return spring 46 is a compression spring; one end of the return spring 46 is connected with the inner wall of the corresponding outer sleeve 37, and the other end is connected with the end face of the corresponding inner rod 40; as shown in fig. 2 and 6, the arc plate a25 is fixedly connected to the round rod 23 through a fixing plate a24 to increase the movement amplitude of the corresponding arc plate C42 along the radial direction of the round rod 23.

As shown in fig. 9, 10 and 11, the outer side of the ring transformer 1 is hinged with a locking block 11; a bolt 19 is in threaded fit with an L seat 18 fixedly arranged on the outer side of the baffle A12, and the bolt 19 is matched with a round hole in the locking block 11; the bolt 19 has anti-slip serrations on its nut to facilitate manual turning of the knob.

As shown in fig. 7, each of the baffles B31 is symmetrically provided with two V-shaped elastic clamping plates 35 axially spaced along the circular rod 23; as shown in fig. 2, 10 and 11, each clamping plate 35 is movably arranged in a ring groove B13 inside the baffle a12 and a ring groove A3 inside the ring transformer 1; as shown in fig. 2 and 3, each catch plate 35 is engaged with the latch 21 mounted in the latch groove 14 on the inner wall of the corresponding slide groove B.

As shown in fig. 9, 10 and 11, the baffle a12 has a core B16 therein, which is fitted with a non-closed ring core a6 in the ring transformer 1; when the baffle A12 is in a closed state relative to the ring transformer 1, the insulating layer on the outer surface of the baffle A12 is tightly connected with the insulating layer on the outer surface of the ring transformer 1, and the iron core B16 in the baffle A12 is tightly connected with the iron core A6 in the ring transformer 1 to form a complete ring iron core.

The annular transformer 1 of the invention adopts the prior art and mainly comprises an annular iron core A6, a coil winding 7, a current monitoring module 8 and a signal transmitting module 9, wherein the outer side of the annular iron core A6 is wrapped by an insulating layer, and the current monitoring module 8 and the signal transmitting module 9 are electrically connected with two ends of the coil winding 7.

The working process of the invention is as follows: in the initial state, the baffle a12 is in a closed state to the opening 2 of the ring transformer 1, the bolt 19 screwed on the L seat 18 of the baffle a12 is inserted into the round hole of the lock block 11 on the ring transformer 1 and locks the baffle a12 in the closed state to the opening 2 of the ring transformer 1, and the plate spring 22 is in a compressed state. The three baffles B31 are respectively in a closed state for the interval between the two corresponding arc plates B27, the two snap plates 35 on each baffle B31 are respectively positioned in the ring groove B13 on the baffle A12 or the two ring grooves A3 on the inner wall of the ring transformer 1, and the snap plates 35 are in an elastic deformation state. Each forked arc plate C42 is engaged with the corresponding forked arc plate a 25. The return spring 46 in each housing 37 is in compression. Both volute springs 47 are in a compressed state.

When the invention needs to be installed on a cable of a three-phase circuit, the ring transformer 1 is rotated relative to the three arc plates B27, and the rotation direction of the ring transformer 1 is consistent with the inclination direction of the clamping plate 35 on the corresponding baffle B31. When the clamping grooves 14 on the two ring grooves A3 of the baffle A12 are respectively opposite to the two clamping plates 35 on one baffle B31, the two clamping plates 35 on the baffle B31 respectively enter the corresponding clamping grooves 14 under the action of self elasticity. Then, the ring transformer 1 is rotated reversely, so that the two clamping plates 35 on the baffle B31 are inserted into the gaps between the clamping blocks 21 in the two clamping slots 14 and the tops of the clamping slots 14 respectively. When the movement of the catch plates 35 within the respective catch slots 14 reaches the extreme position, the central axes of the two round pins a17 coincide with the central axes of the two round pins B34 on the respective stop plates B31.

Then, the bolt 19 on the baffle a12 is screwed so that the bolt 19 is disengaged from the round hole on the lock piece 11 and the locking state of the baffle a12 to the opening 2 of the ring transformer 1 is released, and the lock piece 11 is swung away from the L seat 18 so that the lock piece 11 and the L seat 18 do not interfere with the opening of the baffle a12 to the opening 2 of the ring transformer 1.

Next, the dial 20 is pulled, the plate spring 22 is further compressed, and the shutter a12 swings around the center axis of the round pin a17 and opens the opening 2 of the ring transformer 1. The opened shutter a12 carries the corresponding shutter B31 open around the central axis of the two round pins B34 by the corresponding two catch plates 35, and the two scroll springs 47 are further compressed. The opened baffle B31 drives the fork-shaped arc plate C42 mounted on the two inner rods 40 to translate and disengage from the corresponding fork-shaped arc plate a25 through a deformed quadrilateral four-bar linkage 44 mechanism formed by the outer sleeve 37, the connecting rod 44, the arc plate B27 and the baffle B31, and the inner rod 40 in each outer sleeve 37 moves outwards of the corresponding outer sleeve 37 to the limit under the action of the corresponding return spring 46.

When the baffle a12 and the baffle B31 are completely opened, a cable in a three-phase circuit is radially placed into the space between the two arc plates B27 that have been opened through the opening 2 opened in the ring transformer 1 and placed in the corresponding arc plate a 25. Then, the baffle a12 is enabled to close the ring transformer 1 under the reset action of the plate spring 22, the baffle a12 drives the baffle B31 to close through the corresponding two clamping plates 35, the two volute springs 47 release energy, and the baffle B31 drives the two fork-shaped arc plates C42 to perform translational reset through the corresponding two outer sleeves 37 and the inner rod 40 sliding in the outer sleeves 37, and tightly presses and fixes the cable in the arc plate a 25. While the two arc plates C42 press and fix the cables inside the arc plate a25, the inner rods 40 of the two arc plates C42 are respectively retracted into the corresponding outer sleeves 37, and the return springs 46 inside the outer sleeves 37 are re-compressed again.

When the baffle A12 drives the baffle B31 to be completely closed, the ring transformer 1 is continuously rotated on the three arc plates B27, the rotation direction of the ring transformer 1 is consistent with the inclination direction of the clamping plates 35 on the corresponding baffle B31, and the two clamping plates 35 positioned in the clamping grooves 14 are gradually separated from the clamping grooves 14 and the clamping blocks 21 respectively and enter the annular groove B13 on the baffle A12 and the annular groove A3 on the inner wall of the ring transformer 1 through elastic deformation.

When the clamping grooves 14 on the two ring grooves B13 of the baffle A12 are respectively opposite to the two clamping plates 35 on the second baffle B31, the two clamping plates 35 on the second baffle B31 respectively enter the corresponding clamping grooves 14 under the action of self elasticity. Then, the ring transformer 1 is rotated reversely, so that the two clamping plates 35 on the second baffle B31 are inserted into the gaps between the clamping blocks 21 in the two clamping slots 14 and the tops of the clamping slots 14 respectively. When the movement of the catch plates 35 in the respective catch slots 14 reaches the limit position, the central axes of the two round pins a17 coincide with the central axes of the two round pins B34 on the second shutter B31.

Next, the dial 20 is pulled, the plate spring 22 is further compressed, and the shutter a12 swings around the center axis of the round pin a17 and opens the opening 2 of the ring transformer 1. The baffle A12 drives the second baffle B31 to open through the two clamping plates 35, the corresponding two scroll springs 47 are further compressed, and the baffle B31 drives the corresponding two arc plates C42 to simultaneously separate from the corresponding arc plates A25 through a series of transmission. When the second cable is radially put into the corresponding arc plate A25, the baffle A12 drives the second cable in the corresponding two arc plates C42 to tightly press and fix the second cable in the arc plate A25 through the baffle B31 under the reset action of the plate spring 22. Thus, the third baffle B31 is opened and the third cable is placed into the third arc plate a25 in the same flow, and after the baffle a12 is closed, the corresponding two arc plates C42 tightly press and fix the third cable in the third arc plate a25, after the baffle a12 is closed, the lock block 11 is swung into the L seat 18 again and the bolt 19 is screwed, so that the bolt 19 is inserted into the round hole on the lock block 11 again and the baffle a12 locks the closed state of the opening 2 of the ring transformer 1, thereby completing the installation and fixation of the invention at any position in the three-phase circuit.

When the three-phase cable dismounting device needs to be dismounted from three cables of a three-phase circuit, the three baffles B31 are sequentially opened by adopting the process, and the three cables are sequentially and radially taken out, so that the dismounting of the three-phase three-cable dismounting device can be completed. The invention can be directly installed at any position on the installed cable without flanges or bonding, and the installation position of the zero sequence current transformer is not required to be reserved on the cable, so that the installation efficiency is higher. Meanwhile, compared with the improved high-voltage current transformer with the published patent number of 201610282090.7, the high-voltage current transformer can finish the fixed installation on the cable under the condition that the cable which is installed or is in a working state is not disconnected, and has the advantages of convenient and fast operation, less operation procedures and higher installation efficiency. In addition, the cables entering the movable groove are clamped and fixed through the two fork-shaped arc plates in the movable groove, so that the three-phase cable clamp can be suitable for three-phase cables with different diameters, and has a wider application range.

In conclusion, the beneficial effects of the invention are as follows: the invention can be directly installed at any position on the installed cable without flanges or bonding, and the installation position of the zero sequence current transformer is not required to be reserved on the cable, so that the installation efficiency is higher. Meanwhile, compared with the improved high-voltage current transformer with the published patent number of 201610282090.7, the high-voltage current transformer can finish the fixed installation on the cable under the condition that the cable which is installed or is in a working state is not disconnected, and has the advantages of convenient and fast operation, less operation procedures and higher installation efficiency. In addition, the cables entering the movable groove are clamped and fixed through the two fork-shaped arc plates in the movable groove, so that the three-phase cable clamp can be suitable for three-phase cables with different diameters, and has a wider application range.

Claims

1. The utility model provides a current transformer easy to assemble which characterized in that: the three arc plates B which are uniformly distributed in the circumferential direction and have the same central axis are respectively arranged on the round rod through connecting plates B, forked arc plates A which support cables entering in the radial direction are arranged in a space between any two adjacent connecting plates B, and the three arc plates A are uniformly distributed in the circumferential direction; one side wall of each arc plate B is hinged with an arc baffle B for opening and closing a gap between the arc plate B and the adjacent arc plate B through two round pins B parallel to the round rod; the baffle B and the two corresponding arc plates B which are in a closed state at the gap between the two adjacent arc plates B form a complete arc plate which has the same central axis with the round rod; each arc plate B is symmetrically provided with two vortex springs for swinging and resetting the corresponding baffle B;

the inner side of each baffle B is hinged with two symmetrical outer sleeves which are distributed at intervals along the axial direction of the round rod, and each outer sleeve forms a parallelogram four-bar linkage with the corresponding arc plate B and the baffle B through a connecting rod; an inner rod is arranged in each outer sleeve in a sliding mode, and a fork-shaped arc plate C which is matched with the corresponding arc plate A and used for pressing and fixing the cable in the arc plate A is arranged at the tail end of the inner rod; each outer sleeve is internally provided with a return spring for returning the corresponding inner rod;

the outer sides of the three arc plates B are rotatably matched with an annular transformer; an arc-shaped baffle A for opening and closing the annular transformer is hinged to an opening of the annular transformer through two round pins A, and the baffle A in a closed state of the opening and the annular transformer form a complete zero-sequence current transformer; the central axis of the round pin A and the central axis of any round pin B are positioned on the same ring surface of the same central axis of the round rod; a plate spring for swinging and resetting the baffle A is arranged on the outer side of the annular transformer;

2. An easy-to-install current transformer according to claim 1, wherein: the two round pins A are symmetrically and fixedly arranged at two ends of the baffle A, and are respectively in rotating fit with the two lugs A arranged at two ends of the annular transformer; the baffle A is provided with an arc surface B which is concentric with the round pin A and has an axis, and the annular transformer is provided with an arc surface A which is concentric with the round pin A and is in contact fit with the arc surface B; the outer side of the baffle A is provided with a manual shifting plate; one end of the plate spring is connected with the shifting plate, and the other end of the plate spring is connected with the outer side of the annular transformer; the ring protrusion B on the inner side of the baffle A and the ring protrusion A on the inner side of the ring transformer rotate in the ring groove D on the outer side of the baffle B and the ring groove C on the outer side of the arc plate B.

3. An easy-to-install current transformer according to claim 1, wherein: one end of the outer sleeve is hinged between the two support lugs D on the inner side of the corresponding baffle B; one end of the connecting rod is hinged between the two support lugs E on the corresponding outer sleeve, and the other end of the connecting rod is hinged between the two support lugs F on the inner side of the corresponding arc plate B; two symmetrical support lugs C are arranged at two ends of the baffle B, two round pins B with the same central axis are fixedly arranged on the two support lugs C respectively, and the two round pins B are in rotary fit with the two support lugs B at two ends of the corresponding arc plate B respectively; two volute springs for resetting the baffle B are respectively nested on the corresponding round pins B and are respectively positioned in the ring grooves E on the corresponding support lugs B; one end of the volute spring is connected with the inner wall of the corresponding annular groove E, and the other end of the volute spring is connected with the corresponding round pin B.

4. An easy-to-install current transformer according to claim 1, wherein: the inner rod is symmetrically provided with two guide blocks which respectively slide in two guide grooves on the inner wall of the corresponding outer sleeve; the return spring is a compression spring; one end of the reset spring is connected with the inner wall of the corresponding outer sleeve, and the other end of the reset spring is connected with the end face of the corresponding inner rod; the arc plate A is fixedly connected with the round rod through the fixing plate A so as to increase the radial motion amplitude of the corresponding arc plate C along the round rod.

5. An easy-to-install current transformer according to claim 1, wherein: the outer side of the annular transformer is hinged with a locking block; a bolt is matched with the L seat fixedly arranged on the outer side of the baffle A through threads, and the bolt is matched with a round hole in the locking block; the nut of the bolt is provided with anti-skid insections which are convenient for manual knob.

6. An easy-to-install current transformer according to claim 1, wherein: two V-shaped elastic clamping plates which are distributed at intervals along the axial direction of the round rod are symmetrically arranged on each baffle B, and each clamping plate is movable in a ring groove B on the inner side of the baffle A and a ring groove A on the inner side of the ring transformer; each clamping plate is matched with a clamping block arranged in a clamping groove on the inner wall of the corresponding sliding groove B.

7. An easy-to-install current transformer according to claim 1, wherein: an iron core B matched with the unclosed annular iron core A in the annular transformer is arranged in the baffle A; when the baffle A is in a closed state for the annular transformer, the insulating layer on the outer surface of the baffle A is tightly connected with the insulating layer on the outer surface of the annular transformer, and the iron core B in the baffle A is tightly connected with the iron core A in the annular transformer to form a complete annular iron core.