CN113628843B

CN113628843B - Precise current transformer

Info

Publication number: CN113628843B
Application number: CN202110924096.0A
Authority: CN
Inventors: 王路明; 王一瑭
Original assignee: Deqing Gig Electronic Co ltd
Current assignee: Deqing Gig Electronic Co ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2023-04-14
Anticipated expiration: 2041-08-12
Also published as: CN113628843A

Abstract

The invention discloses a precision current transformer, which comprises a base shell, a rotating core, a fixed core, a transposition device and a slideway, wherein the middle of the base shell is provided with a substrate which divides the base shell into an upper layer and a lower layer, the upper layer is internally provided with the fixed core, the lower layer is provided with the slideway, and the slideway and the fixed core are coaxial; the outer side of the front end of the slideway is provided with a transposition device, the rotating core can move along the axis of the transposition device, so that the rotating core can be transposed between the upper layer and the lower layer, and when the rotating core is transposed to the lower layer, the rotating core can retract into the slideway along the slideway; when the rotating core is positioned on the upper layer, the retraction end of the rotating core is abutted with the butt joint end of the fixed core, and the extension end of the rotating core is abutted with the fixed end of the fixed core, so that a complete annular induction core is formed by butt joint. The invention is installed based on the cable by an open-close type structure, and the limitation of the installation position is small; can be assembled/disassembled at any time, is convenient to use and has high operation efficiency.

Description

Precise current transformer

Technical Field

The invention relates to the technical field of current measurement, in particular to a precision current transformer.

Background

Current transformers are widely used for line current measurement, and current transformers use a one-piece annular iron core around which a secondary winding is wound. When the current transformer is installed, the tested line needs to be powered off, the tested line is disconnected, the tested line penetrates through the central hole of the annular iron core, and then the connection of the tested line is restored. Current transformers are typically installed near the line connection under test. Therefore, the selection range of the installation place of the mutual inductor is limited, the workload of installing the mutual inductor is increased, and unsafe factors and hidden dangers are brought.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a precise current transformer which is installed based on a cable in an open-close type structure, and the limitation of the installation position is small; can be assembled/disassembled at any time, is convenient to use and has high operation efficiency.

The technical scheme for solving the problems is that the invention provides a precision current transformer which comprises a base shell, a rotating core, a fixed core, a transposition device and a slideway, wherein a substrate for dividing the base shell into an upper layer and a lower layer is arranged in the middle of the base shell, the fixed core is arranged in the upper layer, the slideway is arranged in the lower layer, and the slideway and the fixed core have the same axis; the transposition device is arranged on the outer side of the front end of the slide way, the rotating core can move along the axis of the transposition device, so that the rotating core can be transposed between an upper layer and a lower layer, and when the rotating core is transposed to the lower layer, the rotating core can retract into the slide way along the slide way; when the rotating core is positioned on the upper layer, the retraction end of the rotating core is abutted with the abutting end of the fixed core, and the extension end of the rotating core is abutted with the fixed end of the fixed core, so that a complete annular induction core is formed by abutting.

Further, still include outer cover, it is by to rotate the core outer loop cladding outer cover, outer cover including the cladding in rotate outer shroud plate on the core outer loop lateral wall, cladding in rotate the end shroud plate on the core bottom, outer shroud plate is located the end of stretching out of rotating the core is provided with the initial block, outer shroud plate is located the end of contracting of rotating the core is provided with the termination block, end shroud plate is located the end of contracting of rotating the core is provided with the slope.

Furthermore, an upward slope surface inclined upwards is arranged at the butt joint end of the fixed core in the direction far away from the substrate, a butt joint slope surface is arranged behind the bottom of the upward slope surface of the substrate, and the slope of the butt joint slope surface is greater than that of the upward slope surface; the retraction end of the rotating core is matched with the upper slope surface to arrange a lower slope surface, so that the upper slope surface can be completely butted with the lower slope surface; the upper end of the slope is in smooth butt joint with the bottom of the lower slope surface, the slope of the slope is larger than that of the lower slope surface, and the slope of the slope is smaller than that of the butt joint slope surface; the thickness of the bottom clad plate is larger than that of the substrate, so that the substrate can be abutted to the slope surface of the slope when the ascending slope surface and the descending slope surface are completely butted.

Further, the transposition device comprises a sleeve ring and a fixed shaft, the fixed shaft comprises a rotating shaft and a fixed ring, the fixed ring is coaxially fixed on the lower section of the rotating shaft, and an annular meshing part is arranged on the outer annular wall of the fixed ring; the lantern ring is rotatably sleeved on the upper section of the rotating shaft, and the lantern ring and the fixed ring do not rotate synchronously; the fixed ring is positioned on the lower layer of the base shell, and the lantern ring is positioned on the upper layer of the base shell.

Furthermore, an arc-shaped engagement part is arranged on the annular wall of one side, opposite to the center of the base shell, of the lantern ring, a sector-shaped shifting block is arranged on the opposite side of the arc-shaped engagement part on the lantern ring, and the shifting block extends to the outside of the base shell; the lantern ring is provided with the elastic component between the meshing portion of stirring piece and arcuation, the base shell corresponds the elastic component is provided with the limiting plate, the spacing chamber is put to the limiting plate embeds, the elasticity end of elastic component place in spacing intracavity makes spacing chamber can the backstop the rotation of elastic component, thereby it is right the lantern ring provides reverse elasticity.

Furthermore, a toothed portion is arranged on an outer covering plate of the rotating core and behind the termination block, the toothed portion is composed of a plurality of independent racks, each rack comprises a rack body and two pointed ends, the two pointed ends are respectively arranged at two ends of the rack body, the racks are arranged on the outer covering plate in parallel with the axis line of the transposition device, when the arc-shaped meshing portion on the lantern ring is staggered with the annular meshing portion on the fixed ring, the pointed ends at two ends of the racks can automatically correct the relative positions of the upper and lower meshing portions, so that the toothed portion can be meshed with the upper and lower meshing portions of the transposition device simultaneously, and the rotating core can move up and down along the axis line direction of the transposition device.

Further, the rotating core retracted in the slideway rotates towards the outside of the base shell, when the extending end of the rotating core is abutted against a positioning plate below the fixed end of the fixed core, the poking block is rotated anticlockwise, the rotating angle is kept unchanged, the elastic force of the elastic piece on the lantern ring is opposite to the rotating direction of the lantern ring, and the rotating core is lifted upwards to enable the rotating core to translate to the upper layer; when the poking block is loosened, the reverse elasticity of the elastic piece to the lantern ring acts on the rotating core, so that the extending end of the rotating core is tightly abutted to the fixed end of the fixed core.

Furthermore, the base shell is of a fan-shaped annular structure, the height of a telescopic port of the base shell is at least twice of the height of the rotating core, and a plug connector is arranged at the telescopic port and used for filling a neutral position of the telescopic port; a first plate and a second plate are respectively arranged inside the telescopic port and positioned on two sides of the rotating core, and the second plate is positioned in the inner ring; the plug connector comprises an anti-drop wire, an outer plate and an inner insertion block, wherein the outer plate is fixedly connected to the outer side end of the inner insertion block, the upper end of the outer plate is flush with the inner insertion block, an extension part is arranged at the lower end of the outer plate, one end of the anti-drop wire is connected with the bottom plate of the base shell, and the other end of the anti-drop wire is connected with the extension part of the outer plate; the inner insertion block can be inserted among the first plate, the second plate and the bottom plate so as to upwardly support the rotating core positioned on the upper layer.

Furthermore, the slide is arranged between the base plate and the bottom plate of the base shell and comprises an outer road plate and an inner road plate, the end part of the inner road plate is smoothly connected with the second plate, and a gap is reserved between the outer road plate and the first plate and used for accommodating and installing the transposition device.

Furthermore, an arc-shaped cavity is formed between the upper surface of the substrate and the lower surface of the fixed core, and the winding coil can be wound on the fixed core through the cavity, so that the fixed core wound by the winding coil can be stably and circularly mounted and fixed on the substrate.

Furthermore, the meshing part, the outer cover, the insection part, the base shell and the slideway can be made of insulating materials, such as epoxy resin, and the meshing part and the insection part can be made of polyformaldehyde.

Further, the starting block can be stopped by the first plate, so that the extending end of the rotating core is always positioned outside the telescopic port; the start block can be stopped by the outer side of the port plate of the closing port, so that the depth of the protruding end of the rotating core inserted into the closing port is always limited. It will be appreciated that when the protruding end abuts the fixed end, the starting block does not abut the port plate closing the port.

Further, the termination block is located in the slide way and can be stopped by the inner side face of the port plate of the closed port, so that the retraction length of the rotating core is always limited. It will be appreciated that when the termination block abuts the inside of the port plate closing the port, the start block does not abut the first plate.

Further, the base shell still is provided with the backstop board, and backstop board, limiting plate are located transposition device's both sides respectively, when dialling the piece anticlockwise rotation, can by the backstop board blocks to the anticlockwise rotation scope of piece is dialled in the restriction, and the protection elastic component is in the elastic range all the time.

The invention has the beneficial effects that:

the invention relates to a precise current transformer, wherein an annular iron core is formed by precisely combining two parts, is mounted on the basis of a cable by adopting an open-close type structure, is not influenced by the wiring state of the cable, can be mounted to any position of the cable in the using state of the cable, and has small limitation on the mounting position and wide application range.

The device has the advantages of simple installation and operation, convenient integral loading and carrying, wide working frequency range, high metering precision, good applicability and portability, and stable and reliable performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

Fig. 1 is a main body view of a precision current transformer according to an embodiment of the present invention;

fig. 2 is a top structure diagram of a precision current transformer according to an embodiment of the present invention;

fig. 3 is a lower structure diagram of a precision current transformer according to an embodiment of the present invention;

fig. 4 is a structure diagram of a lower layer slideway of a precision current transformer according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a retraction of a rotary core of a precision current transformer in accordance with an embodiment of the present invention;

fig. 6 is a schematic structural diagram of components of a transposition apparatus of a precision current transformer according to an embodiment of the present invention;

fig. 7 is a rack structure view of a insection part of a precision current transformer according to an embodiment of the present invention;

FIG. 8 is a schematic side view of a retracting end of a rotary core of a precision current transformer in accordance with an embodiment of the present invention;

fig. 9 is a schematic diagram of a current transformer according to an embodiment of the present invention.

In the figure: 1. a base shell; 2. rotating the core; 3. fixing the core; 4. covering the sleeve; 5. a transposition device; 6. a serration; 7. a slideway; 8. a plug-in unit; 9. a shifting block; 11. a limiting plate; 12. a stopper plate; 13. a base plate; 14. a top plate; 21. a first plate; 22. a second plate; 31. a winding coil; 32. a substrate; 33. a cavity; 41. a start block; 42. a termination block; 43. a slope; 51. a collar; 52. fixing a shaft; 521. a rotating shaft; 522. fixing a ring; 53. an engaging portion; 61. a tooth body; 62. a tip; 71. an outer road plate; 72. an inner track plate; 81. preventing the thread from falling off; 82. an outer plate; 83. an inner insertion block; 91. an elastic member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In order to solve the above problems, the present invention provides a precision current transformer, please refer to fig. 1-8, which mainly comprises a base shell 1, a rotating core 2, a fixed core 3, a transposition device 5, and a slideway 7, wherein a substrate 32 for dividing the base shell 1 into an upper layer and a lower layer is arranged in the middle of the base shell 1, the fixed core 3 is arranged in the upper layer, the slideway 7 is arranged in the lower layer, and the slideway 7 and the fixed core 3 are coaxial; the outer side of the front end of the slideway 7 is provided with a transposition device 5, the rotating core 2 can move along the axis of the transposition device 5, so that the rotating core 2 can be transposed between an upper layer and a lower layer, and when the rotating core 2 is transposed to the lower layer, the rotating core 2 can retract into the slideway 7 along the slideway 7; when rotating core 2 and being located the upper strata, the end butt joint of the end of contracting of rotating core 2 and fixed core 3, the end butt joint of the stiff end butt joint of the end of stretching out and fixed core 3 that rotates core 2 to butt joint forms a complete annular induction core.

The overall structure of the base housing 1 is a fan-shaped ring structure with a fan angle of more than one hundred and eighty degrees, as shown in fig. 1, and a central position is available for threading. The base plate 32 is used for layering the inside of the base shell 1, the base plate 32 is fixedly connected to the middle position of the base shell 1, and the base shell 1 is divided into an upper layer and a lower layer, wherein the upper layer is internally provided with the fixed core 3, and the rotating core 2 can be butted with the fixed core 3 to form an annular iron core when positioned on the upper layer, so that the mutual inductor is in a closed state; the lower layer can be used for retracting the rotating core 2, the rotating core 2 is separated from the fixed core 3 and retracts into the slideway 7 of the lower layer, and the mutual inductor can be in an opening and closing state.

In the embodiment of the present invention, the winding coil 31 is disposed on the fixed core 3, and in order to prevent the winding coil 31 from interfering with the basic installation posture of the fixed core 3, an arc-shaped cavity 33 may be formed between the upper surface of the substrate 32 and the lower surface of the fixed core 3, and the winding coil 31 is wound on the fixed core 3 in the cavity 33. The cavity 33 can be opened on the substrate 32 and can be opened to a groove structure.

The two ends of the fixed core 3 and the base plate 32 form stable fixed connection effect, so that the fixed core 3 is always in a stable and circumferential state during installation and fixation, and a good butt joint effect can be formed when the fixed core is in butt joint with the rotating core 2.

The slideway 7 is arranged below the fixed core 3 in a same position according to the installation and fixing position of the fixed core 3, and the slideway 7 and the fixed core 3 are coaxially arranged, so that the rotating core 2 only needs to translate up and down when the transposition between the upper layer and the lower layer is carried out, the butt joint error is reduced, and the sliding risk is reduced.

In the embodiment of the invention, the slide 7 is arranged between the base plate 32 and the bottom plate 13 of the base shell 1, and the size of the inner cavity of the slide 7 is not smaller than that of the rotating core 2, so that the rotating core 2 can freely slide and rotate in the slide 7 to realize the opening/closing of the annular iron core.

Specifically, the chute 7 comprises an outer plate 71 and an inner plate 72, wherein both ends of the inner plate 72 can be smoothly connected with the second plate 22 at the end of the inner plate of the base shell 1, so as to facilitate the sliding rotation of the rotary core 2. A gap is arranged between the front end of the outer plate 71 and the first plate 21 at the telescopic port of the base shell 1, and is used for accommodating and installing the transposition device 5, so that a basic space is provided for the matching relationship between the rotating core 2 and the transposition device 5. The trailing end of the outer plate 71 may then be brought directly into abutting relationship with the port plate of the closed port of the base housing 1.

Further, the height of the telescopic port of the base housing 1 should be at least twice the height of the rotary core 2, so that the rotary core 2 can directly perform the position change operation of up-down translation. When rotating core 2 and being located the upper strata, can accomplish the butt joint with fixed core 3 to form annular iron core, but when rotating core 2 and being located the upper strata, it does not have effective support basically to rotate core 2 below, consequently, can set up plug connector 8 in flexible port department for fill the neutral position of flexible port, thereby form the supporting effect to rotating core 2 that is located the upper strata.

It will be appreciated that the height of the closed end is also at least twice the height of the rotary core 2, and that a plug 8 may be provided at the closed end to stabilize the abutting effect between the protruding end of the rotary core 2 and the fixed end of the fixed core 3.

Specifically, the plug connector 8 includes a separation preventing wire 81, an outer plate 82, and an inner insertion block 83, the outer plate 82 is fixedly connected to the outer end of the inner insertion block 83, and the front end of the inner insertion block 83 can be cut to facilitate the insertion, so as to reduce the difficulty of the butt joint, as shown in fig. 8. The upper end of the outer plate 82 may be flush with the inner insertion block 83, and the lower end of the outer plate 82 may be provided with an extension so that the outer plate 82 may protrude out of the top plate 14 and the bottom plate 13 of the base housing 1 to facilitate the removal of the plug 8. One end of the anti-falling wire 81 is fixedly connected to the bottom plate 13, and the other end is connected to an extension of the outer plate 82, so that the plug 8 and the base case 1 are integrally held and are not easily dropped.

The inside of the telescopic port is located at two sides of the rotary core 2 and can be respectively provided with a first plate 21 and a second plate 22, wherein the first plate 21 is located at the outer side, and the second plate 22 is located at the inner side. When the rotary core 2 is located at the upper layer and is butted with the fixed core 3 to form the annular iron core, the inner insertion block 83 can be inserted among the first plate 21, the second plate 22 and the bottom plate 13, and the inner insertion block 83 is located below the rotary core 2 and can upwards support the rotary core 2, so that the butt joint stability of the whole annular iron core is stabilized.

It will be appreciated that the end of the outer plate 82 which is flush with the inner insert 83 abuts the rotary core 2 and that the extension of the outer plate 82 can project beyond the top plate 14 or the bottom plate 13 of the base housing 1. The length of the separation preventing thread 81 can be set to be slightly longer so that the plug 8 can be plugged not only below the rotary core 2 but also above the rotary core 2.

It will be appreciated that the second plate 22 may be provided inside the closed port of the base housing 1 to facilitate stable insertion of the insertion block 83, but the first plate 21 is not provided to reduce the influence on the rotation range of the rotary core 2.

It can be understood that when the rotating core 2 retracts into the slideway 7, the retracting and fixing of the rotating core 2 can be completed by completing the insertion of one insertion piece 8 at the telescopic port, and the insertion piece 8 at the closed port can also be inserted above the rotating core 2.

It can be understood that when rotating core 2 and being located the upper strata, go out to accomplish the grafting of a plug connector 8 at flexible port, when closing port department accomplishes the grafting of a plug connector 8 equally, can provide comparatively good butt joint supporting effect to the butt joint of rotating core 2 and fixed core 3 in the flexible port, can keep the basis at both ends balanced to the realization rotates core 2 and fixed core 3's butt joint stably.

In the embodiment of the invention, the outer ring wall and the bottom wall of the rotating core 2 are wrapped with the outer covering sleeve 4, the outer covering sleeve 4 comprises an outer covering plate wrapped on the outer ring side wall of the rotating core 2 and a bottom covering plate wrapped on the bottom of the rotating core 2, the outer covering plate is provided with a starting block 41 at the extending end of the rotating core 2, the outer covering plate is provided with a stopping block 42 at the retracting end of the rotating core 2, and the bottom covering plate is provided with a slope 43 at the retracting end of the rotating core 2.

Specifically, the start block 41 can be stopped by the first plate 21 so that the protruding end of the rotation core 2 is always located outside the telescopic port; the start block 41 can be stopped by the outer side of the port plate of the closing port so that the depth of insertion of the protruding end of the rotary core 2 into the closing port is always limited. It will be appreciated that when the protruding end abuts the fixed end, the initiator block 41 does not abut the port plate closing the port.

Correspondingly, the stop block 42 is located inside the slide 7, and the stop block 42 can be stopped by the inner side surface of the port plate of the closed port, so that the retraction length of the rotary core 2 is always limited. It will be appreciated that when the termination block 42 abuts the port plate inner side of the closed port, the start block 41 does not abut the first plate 21.

Based on the butt joint of rotating core 2 and fixed core 3, when rotating core 2 and being located the upper strata, the butt joint end butt joint of the end of contracting with fixed core 3 that contracts of rotating core 2 rotates the core 2, and the stiff end butt joint of the end that stretches out and fixed core 3 that rotates core 2 to the butt joint forms a complete annular induction core.

Specifically, referring to fig. 8, an upward slope inclined upward is disposed at the butt joint end of the fixing core 3 in a direction away from the base plate 32, a butt joint slope is disposed behind the bottom of the upward slope of the base plate 32, and the slope of the butt joint slope is greater than that of the upward slope. The retraction end of the rotating core 2 is matched with the upper slope surface to arrange a lower slope surface, so that the upper slope surface can be completely butted with the lower slope surface. The upper end of the slope 43 is smoothly butted with the bottom of the downhill surface, the gradient of the slope 43 is larger than that of the downhill surface, and the gradient of the slope 43 is smaller than that of the butted slope surface. The thickness of the bottom clad plate is larger than that of the substrate 32, so that the substrate 32 can abut against the slope surface of the slope 43 when the ascending slope surface and the descending slope surface are completely abutted.

When the rotating core 2 and the fixed core 3 are in a butt joint state, if the rotating core 2 slides downwards along the inclined plane relative to the fixed core 3, the inclined plane 43 is limited by the butt joint slope surface of the base plate 32, so that the rotating core 2 and the fixed core 3 are automatically separated, and the annular iron core is separated; if the rotating core 2 slides upward along the inclined surface relative to the fixed core 3, the abutting slope surface of the slope 43 and the base plate 32 is always kept in a smooth abutting state, the abutting effect of the rotating core 2 and the fixed core 3 is not changed, and the annular iron core has a certain degree of dislocation but cannot be separated. Therefore, if the plugging effect of the plug-in unit 8 is unstable, external intervention can be performed, the plugging thickness is increased, the rotating core 2 slides upwards along the inclined plane relative to the fixed core 3, and the butt joint of the annular iron core is completed.

In the embodiment of the present invention, the transposition device 5 includes a collar 51 and a fixed shaft 52, wherein the fixed shaft 52 includes a rotating shaft 521 and a fixed ring 522, and the fixed ring 522 is coaxially fixed on the lower section of the rotating shaft 521, so that the fixed ring 522 and the rotating shaft 521 rotate synchronously. The outer ring wall of the fixed ring 522 is provided with an annular engaging portion 53, and when the fixed ring 522 rotates, the engaging portion 53 is arranged on any one side edge, so that an engaging relationship can be formed.

The lantern ring 51 is rotatably sleeved on the upper section of the rotating shaft 521, so that the lantern ring 51 and the fixed ring 522 are not rotated synchronously, and the rotation of the lantern ring 51 can be operated independently without affecting the rotation of the fixed ring 522.

Referring to fig. 2, for the collar 51, an arc-shaped engaging portion 53 is disposed on a wall of the collar 51 facing a center side of the base shell 1, a fan-shaped toggle block 9 is disposed on an opposite side of the arc-shaped engaging portion 53 on the collar 51, an elastic member 91 is disposed between the toggle block 9 and the arc-shaped engaging portion 53 of the collar 51, the base shell 1 is provided with a limit plate 11 corresponding to the elastic member 91, the limit plate 11 is provided with a limit cavity therein, and an elastic end of the elastic member 91 is disposed in the limit cavity.

The transposition device 5 can be arranged outside the front end of the slideway 7, and the outer covering plate of the outer covering sleeve 4 of the rotating core 2 is provided with the insection part 6 behind the termination block 42, so that the meshing part 53 on the transposition device 5 and the insection part 6 have a basic butt joint condition of mutual meshing.

Specifically, referring to fig. 7, the tooth pattern portion 6 is composed of a plurality of independent racks, each rack includes a tooth body 61 and a tip 62, the two tips 62 are respectively disposed at two ends of the tooth body 61, and the racks are arranged on the outer shroud plate in parallel to the axial line of the transposition device 5. When the arc-shaped meshing part 53 on the lantern ring 51 is dislocated with the annular meshing part 53 on the fixed ring 522, based on the fixed ring 522 capable of rotating freely, the tips 62 at two ends of the rack can automatically correct the relative positions of the upper and lower meshing parts 53, so that the tooth thread part 6 can be meshed with the upper and lower meshing parts 53 of the transposition device 5 at the same time, and the rotating core 2 can translate up and down along the axial lead direction of the transposition device 5.

Furthermore, the two ends of the engaging teeth in the arc-shaped engaging part 53 on the collar 51 and the annular engaging part 53 on the fixed ring 522 can also be provided with tips 62 as shown in fig. 7, so that the risk of jamming and stagnation is reduced. No matter the tooth thread part 6 slips from the upper layer to the lower layer or from the lower layer to the upper layer, the corresponding and matching of the engaging parts 53 at the upper end and the lower end can be completed with the minimum correction deviation, so that the synchronous engagement is realized, and the position switching is completed.

In the embodiment of the present invention, when the upper and lower positions of the rotary core 2 are switched, the rotary core can be vertically translated upward or downward along the axial line of the transposition device 5, and the insection portion 6 can be vertically slid between the arc-shaped meshing portion 53 and the annular meshing portion 53.

It will be understood that the first and

second plates

21 and 22 can restrict the basic posture of the rotary core 2 during rotation, and the base plate 32 can restrict the height position of the rotary core 2, so that the rotary core 2 can complete the position switching from the upper layer to the lower layer or from the lower layer to the upper layer if and only if the protruding end of the rotary core 2 abuts against the fixed end of the fixed core 3.

The installation of the transformer is taken as an example for explanation:

rotating the rotating core 2 retracted in the slideway 7 to the outside of the base shell 1 to complete the butt joint and looping of the rotating core 2 and the fixed core 3; placing the cable to be tested in the inner ring of the rotating core 2;

when the extending end of the rotating core 2 is abutted against the positioning plate below the fixed end of the fixed core 3, the dial block 9 is rotated anticlockwise and the rotation angle is kept unchanged, so that the elastic force of the elastic piece 91 on the lantern ring 51 is opposite to the rotation direction of the lantern ring 51, namely the reverse elastic force can enable the lantern ring 51 to have the trend of clockwise rotation and resetting; meanwhile, the height of the rotating core 2 is lifted upwards so that the rotating core 2 is translated to the upper layer; the serration 6 slides from the lower mesh state to the upper mesh state.

When the dial block 9 is released, the reverse elasticity of the elastic member 91 to the collar 51 acts on the tooth-pattern part 6 on the rotating core 2, the reverse elasticity acts on the collar 51 to make it have a tendency of clockwise rotation, a thrust towards the fixed core 3 can be applied to the rotating core 2, and the extending end of the rotating core 2 can be tightly abutted to the fixed end of the fixed core 3.

And then completing the insertion of the plug connectors 8 of the telescopic port and the closed port, and completing the installation.

The locating plate that mentions in above-mentioned installation sets up in closed port department, is located the below of fixed core 3 for with rotate the end that stretches out of core 2 and carry out preliminary butt joint, the locating plate can set up, smooth transition with the terminal surface parallel and level of stiff end.

It can be understood that the collar 51 is rotated and the rotation angle is maintained while the internal deformation of the elastic member 91 is given, and after the dial block 9 is released, the elastic member 91 can provide reverse elastic force to the collar 51, and the butt joint of the rotating core 2 and the fixed core 3 can be enhanced by the elastic force of the elastic member 91.

It can be understood that the elastic member 91 may be a torsion spring, an elastic plate, or the like, and has a strong elastic recovery capability. The toggle block 9 may extend to the outside of the base housing 1 to facilitate the installation work by the worker.

It will be appreciated that the stationary ring 522 is located at a lower level of the base housing 1 and the collar 51 is located at an upper level of the base housing 1. The width of the fixed ring 522 and the collar 51 can be designed to correspond to the thickness of the upper and lower layers of the base plate 32, so that the rotary core 2 can be engaged with only one of the layers when the rotary core is completely positioned at the upper layer or the next time.

In the embodiment of the invention, the base shell 1 is further provided with the stop plates 12, the stop plates 12 and the limit plates 11 are respectively positioned at two sides of the transposition device 5, and when the toggle block 9 rotates anticlockwise, the stop plates 12 can block the anticlockwise rotation range of the toggle block 9, so that the anticlockwise rotation range of the toggle block 9 is limited, the elastic piece 91 is protected to be always in the elastic range, and good use specifications are favorably established.

In the embodiment of the present invention, the engaging portion 53, the outer sheath 4, the insection portion 6, the base shell 1, and the slideway 7 may be made of an insulating material, such as epoxy resin; the engaging portion 53 and the tooth-pattern portion 6 may be made of polyoxymethylene. Specifically, the overall structure of the transposition device 5 can be made of polyformaldehyde.

The basic principle of the current transformer of the present invention is shown in fig. 9, the annular iron core is formed by two arc iron cores in butt joint, which correspond to the rotating core 2 and the fixed core 3 of the present invention, respectively, the rotating core 2 and the fixed core 3 are in butt joint to form the annular iron core, and the winding coil 31 is wound on the fixed core 3.

In a specific example, based on the circuit diagram in fig. 9, the left winding is a measured line passing through the center of the transformer, the winding coil 31 is connected to the instrument, when an alternating current passes through the measured line, the magnetic flux of the alternating current induces a current in the winding coil 31 of the current transformer, the current is sampled by the sampling resistor, and then a/D conversion is performed, and the current is matched with the measuring instrument, so that the measured current value can be calculated.

Furthermore, the current transformer can also be applied to equipment of instruments and meters for field calibration, online detection, installation and debugging, wiring inspection, functional analysis and the like of electric energy meters and electric energy metering devices.

It is understood that the winding coil 31, the rotary core 2 and the stationary core 3 may be cast in epoxy resin, and side ends of the rotary core 2 and the stationary core 3 may be exposed.

The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a component of 8230means that the element does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

The foregoing is a further detailed description of the invention in connection with specific preferred embodiments and it is not intended to limit the invention to the specific embodiments described. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.

Claims

1. A precision current transformer is characterized by comprising a base shell (1), a rotating core (2), a fixed core (3), a transposition device (5) and a slide way (7), wherein a substrate (32) which divides the base shell (1) into an upper layer and a lower layer is arranged in the middle of the base shell (1), the fixed core (3) is arranged in the upper layer, the slide way (7) is arranged in the lower layer, and the slide way (7) and the fixed core (3) are coaxial; the transposition device (5) is arranged on the outer side of the front end of the slide way (7), the rotating core (2) can move along the axis of the transposition device (5), so that the rotating core (2) can be transposed between an upper layer and a lower layer, and when the rotating core (2) is transposed to the lower layer, the rotating core (2) can retract into the slide way (7) along the slide way (7); when the rotating core (2) is positioned on the upper layer, the retraction end of the rotating core (2) is abutted with the butt joint end of the fixed core (3), and the extension end of the rotating core (2) is abutted with the fixed end of the fixed core (3), so that a complete annular induction core is formed by butt joint; the transposition device (5) comprises a sleeve ring (51) and a fixed shaft (52), the fixed shaft (52) comprises a rotating shaft (521) and a fixed ring (522), the fixed ring (522) is coaxially fixed on the lower section of the rotating shaft (521), and an annular meshing part (53) is arranged on the outer annular wall of the fixed ring (522); the lantern ring (51) is rotatably sleeved on the upper section of the rotating shaft (521), and the lantern ring (51) and the fixed ring (522) do not rotate synchronously; the fixed ring (522) is positioned at the lower layer of the base shell (1), and the lantern ring (51) is positioned at the upper layer of the base shell (1);

the outer cover plate of the rotating core (2) is provided with a toothed portion (6), the toothed portion (6) is composed of a plurality of independent racks, each rack comprises a toothed body (61) and a tip (62), the two tips (62) are arranged at two ends of the toothed body (61) respectively, the racks are parallel to the axial lead of the transposition device (5) and are arranged on the outer cover plate, when the arc-shaped meshing portion (53) on the lantern ring (51) and the annular meshing portion (53) on the fixed ring (522) are staggered, the tips (62) at two ends of each rack can automatically correct the relative positions of the upper and lower meshing portions (53), so that the toothed portion (6) can be meshed with the upper and lower meshing portions (53) of the transposition device (5) simultaneously, and the rotating core (2) can translate up and down along the axial lead direction of the transposition device (5).

2. The precision current transformer according to claim 1, further comprising an outer sheath (4), wherein the rotating core (2) is covered by the outer sheath (4), the outer sheath (4) comprises an outer sheath plate covered on the outer ring side wall of the rotating core (2) and a bottom sheath plate covered on the bottom of the rotating core (2), an extending end of the outer sheath plate located on the rotating core (2) is provided with a starting block (41), a retracting end of the outer sheath plate located on the rotating core (2) is provided with a stopping block (42), and a retracting end of the bottom sheath plate located on the rotating core (2) is provided with a slope (43).

3. The precision current transformer according to claim 2, wherein the butt joint end of the fixed core (3) is provided with an upward slope inclined towards the direction far away from the substrate (32), the substrate (32) is provided with a butt joint slope surface behind the bottom of the upward slope surface, and the slope of the butt joint slope surface is greater than that of the upward slope surface; the retraction end of the rotating core (2) is matched with the upper slope surface to form a lower slope surface, so that the upper slope surface can be completely butted with the lower slope surface; the upper end of the slope (43) is smoothly butted with the bottom of the downward slope surface, the gradient of the slope (43) is greater than that of the downward slope surface, and the gradient of the slope (43) is smaller than that of the butted slope surface; the thickness of the bottom clad plate is larger than that of the substrate (32), so that the substrate (32) can abut against the slope surface of the slope (43) when the ascending slope surface and the descending slope surface are completely butted.

4. The precision current transformer according to claim 1, characterized in that the collar (51) is provided with an arc-shaped engaging part (53) on the wall opposite to the center of the base shell (1), a sector-shaped toggle block (9) is provided on the collar (51) opposite to the arc-shaped engaging part (53), and the toggle block (9) extends to the outside of the base shell (1); the lantern ring (51) is provided with elastic component (91) between the meshing portion (53) of stirring piece (9) and arcuation, base shell (1) corresponds elastic component (91) is provided with limiting plate (11), limiting plate (11) embeds spacing chamber, the elasticity end of elastic component (91) is arranged in spacing intracavity, makes spacing chamber can backstop the rotation of elastic component (91), thereby it is right lantern ring (51) provides reverse elasticity.

5. A precision current transformer according to claim 2, characterized in that the outer cladding of the rotary core (2) is provided with a toothing (6) behind the stop block (42).

6. A precision current transformer according to claim 4, characterized in that the rotating core (2) retracted in the slideway (7) is rotated towards the outside of the base shell (1), when the extending end of the rotating core (2) abuts against the lower positioning plate of the fixed end of the fixed core (3), the dial block (9) is rotated anticlockwise and keeps the rotation angle unchanged, so that the elastic force of the elastic member (91) to the collar (51) is opposite to the rotation direction of the collar (51), and the rotating core (2) is lifted upwards to make the rotating core (2) translate to the upper layer; when the poking block (9) is loosened, reverse elasticity of the elastic piece (91) to the lantern ring (51) acts on the rotating core (2), so that the extending end of the rotating core (2) is tightly abutted to the fixed end of the fixed core (3).

7. A precision current transformer according to claim 1, characterized in that the base casing (1) is a fan-shaped ring structure, the height of the telescopic port of the base casing (1) is at least twice the height of the rotary core (2), and a plug connector (8) is arranged at the telescopic port to fill the neutral position of the telescopic port; a first plate (21) and a second plate (22) are respectively arranged at two sides of the rotating core (2) in the telescopic port, and the second plate (22) is positioned in the inner ring; the plug connector (8) comprises an anti-falling line (81), an outer plate (82) and an inner insertion block (83), the outer plate (82) is fixedly connected to the outer side end of the inner insertion block (83), the upper end of the outer plate (82) is flush with the inner insertion block (83), an extension part is arranged at the lower end of the outer plate (82), one end of the anti-falling line (81) is connected with a bottom plate (13) of the base shell (1), and the other end of the anti-falling line (81) is connected with the extension part of the outer plate (82); the inner insertion block (83) can be inserted between the first plate (21), the second plate (22), and the bottom plate (13) to upwardly support the rotary core (2) at an upper level.

8. The precision current transformer according to claim 7, characterized in that the slideway (7) is arranged between the base plate (32) and the bottom plate (13) of the base shell (1), the slideway (7) comprises an outer track plate (71) and an inner track plate (72), the end of the inner track plate (72) is smoothly connected with the second plate (22), and a gap is left between the outer track plate (71) and the first plate (21) for accommodating and installing the transposition device (5).

9. The precision current transformer according to claim 1, wherein an arc-shaped cavity (33) is formed between the upper surface of the substrate (32) and the lower surface of the fixed core (3), and the winding coil (31) can be wound on the fixed core (3) through the cavity (33), so that the fixed core (3) wound by the winding coil (31) can be smoothly and circularly mounted and fixed on the substrate (32).