A current transformer that can be replaced while energized

Abstract

This invention discloses a current transformer that can be replaced while energized, relating to the field of current transformer technology. It includes two arc-shaped mating units, which are slidably engaged along a preset path via a sliding structure. The preset path includes a connected arc-shaped segment along the circumference of the housing and a straight segment along the axial direction of the housing. During the sliding process between the two mating units, they sequentially exhibit: a fully overlapping state with axial height difference, a misaligned state with axial height difference and complete separation, and a mating state where they are connected to form a circular structure. A locking element is used to lock the two mating units in the overlapping state. A trigger element, when pressed by the conductor under test, triggers the locking element to unlock. The release of elastic force by the elastic component drives the two mating units to switch from the overlapping state to the misaligned state and then to the mating state. This invention can automatically be fitted onto the conductor under test simply by touching it, making operation very convenient and with a high safety factor.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, specifically to a current transformer that can be replaced while energized. Background Technology

[0002] A current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction. It plays an important role in power systems, transforming high cable currents into standard small currents for accurate measurement by measuring instruments. It also provides accurate current signals for relay protection devices, enabling timely disconnection of faulty circuits in the event of a power system fault, thus protecting equipment and personnel safety.

[0003] Current transformers are typically an integrated ring structure, which is used on the conductor being tested. When an old current transformer is damaged or reaches its end-of-life, the conductor being tested needs to be disconnected from the terminal block, the old current transformer needs to be removed from the conductor, and a new current transformer needs to be installed on the conductor. This causes a temporary power outage on the conductor being tested, which has a negative impact on electricity use in production and daily life.

[0004] To this end, patent CN220509839U discloses a pluggable current transformer, which includes a pluggable mechanism and a fixing mechanism on the outside of the pluggable mechanism. The pluggable mechanism includes a lower housing, a limiting groove is formed on the top of the lower housing, a energizing groove is formed at the bottom of the limiting groove, an installation groove is formed at the bottom of the energizing groove, a buffer spring is installed at the bottom of the inner wall of the installation groove, a blocking post is installed on the top of the buffer spring, a limiting plate is fixedly installed on the top of the blocking post, a locking post is snapped into the inside of the limiting groove, an energizing post is installed at the bottom of the locking post, and an upper housing is fixedly installed on the top of the locking post.

[0005] Patent CN215451082U discloses a quick-connect and quick-release current transformer that is easy to assemble and disassemble. The current transformer consists of an upper housing and a lower housing. Plug-in blocks are fixedly connected to the left and right sides of the bottom of the upper housing. The bottom of the plug-in blocks is provided with a snap-fit ​​groove. A first buffer spring is fixedly connected inside the snap-fit ​​groove, and the other end of the first buffer spring is fixedly connected to the snap-fit ​​block. Plug-in grooves are opened on the left and right sides of the upper part of the lower housing. Push-buttons are movably connected to the left and right sides of the lower housing. Second buffer springs are fixedly connected to the outer surfaces of the push-buttons. The facing sides of the two sets of second buffer springs are connected to the lower housing. The facing sides of the two sets of push-buttons penetrate the lower housing and are fixedly connected to a pressing block. A fixed base is fixedly connected to the bottom of the lower housing.

[0006] In existing technologies such as the aforementioned patents, the current transformer can be installed and removed from the conductor being tested in a plug-and-play manner without interrupting the power supply. However, there are still some shortcomings: First, the plug-and-play current transformer is separate before being installed on the conductor or after being removed from the conductor, which may lead to mismatch or loss of individual components; Second, the current transformer is usually installed near the terminal block of the conductor being tested. The plug-and-play current transformer requires close contact with the conductor being tested during installation, which poses a risk of electric shock. Summary of the Invention

[0007] The purpose of this invention is to provide a current transformer that can be replaced while energized, in order to overcome the shortcomings of the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a current transformer that can be replaced while energized, comprising two arc-shaped docking units, each docking unit comprising an arc-shaped housing, an iron core disposed within the housing, and a winding coil wound on the iron core; the two docking units are slidably engaged along a preset path via a sliding structure, the preset path comprising a connected arc-shaped segment along the circumference of the housing and a straight segment along the axial direction of the housing, the two docking units sequentially exhibiting the following states during sliding: an overlapping state with axial drop and complete overlap, a misaligned state with axial drop and complete offset, and a docking state where they are connected to form a circular structure; a locking member for locking the two docking units in the overlapping state; a trigger member for triggering the locking member to unlock when pressed by the conductor under test; and an elastic component for releasing elastic force to drive the two docking units to switch from the overlapping state to the offset state and then to the docking state. In the docking state, the conductor under test is fitted onto the inner ring of the two housings, the docking ends of the two iron cores are in contact and conductive, and the docking ends of the two winding coils are in contact and conductive.

[0009] Furthermore, one of the two docking units is a first docking unit, and the other is a second docking unit. The elastic component includes a spring groove formed on the housing of the first docking unit. The spring groove includes an open first arc-shaped groove coaxial with the arc-shaped section. A compression spring is housed in the spring groove. One end of the compression spring abuts against one end of the spring groove, and the other end of the compression spring is connected to a sliding post. The sliding post slides in conjunction with the first arc-shaped groove. An inclined guide block is fixedly connected to the inner wall of the housing of the second docking unit. One end of the inclined guide block extends into the first arc-shaped groove, and the sliding post slides in conjunction with the inclined surface of the inclined guide block.

[0010] Furthermore, the first docking unit is in a superior arc shape, and the second docking unit is in a inferior arc shape.

[0011] Furthermore, an arc-shaped guide groove is provided on the housing of the first docking unit, and a connecting rod is slidably connected in the arc-shaped guide groove, with the other end of the connecting rod fixedly connected to the sliding column.

[0012] Furthermore, a support column is fixedly connected to the housing of the first docking unit, and a rotating ring is rotatably connected to the support column. A torsion spring is provided between the rotating ring and the support column. Both the locking element and the triggering element are fixedly connected to the rotating ring. The locking element has a hook portion. In the overlapping state, the hook portion is used to hook the blocking part on the housing of the second docking unit, and the triggering element is blocked in the inner ring of the housing. The hook back of the hook portion is inclined. During the process of switching from the misaligned state to the overlapping state, the hook back and the blocking part slide and abut against each other.

[0013] Furthermore, the sliding structure includes a sliding ridge fixedly disposed on the housing of the first docking unit and a sliding groove formed on the housing of the second docking unit. The length direction of the sliding ridge and the sliding groove are adapted to a preset path. A slider is provided at one end of the sliding ridge that protrudes from the corresponding housing. Both sliders slide in cooperation with the sliding groove.

[0014] Furthermore, in the docking state, the docking ends of the two iron cores are inclined, and the elastic force of the compression spring makes the docking ends of the two iron cores fit tightly together.

[0015] Furthermore, the spring groove also includes a second arc-shaped groove that is coaxial with the first arc-shaped groove and has an axial drop. One end of the second arc-shaped groove is closed, and the other end is connected to the end of the first arc-shaped groove through a curved transition groove.

[0016] Furthermore, each of the two winding coils is connected to a spring piece at both ends, and each spring piece is fixedly connected to the corresponding housing. In the mating state, the spring pieces at the mating ends of the two winding coils are in elastic contact.

[0017] Compared with the prior art, the present invention provides a current transformer that can be replaced while energized. The two docking units are integrated even when not installed on the conductor under test, preventing the loss of a single docking unit or mismatch between the two docking units. By clamping one of the docking units with an insulating rod, the inner rings of the two docking units in the overlapping state are brought close to the conductor under test. The trigger element is pressed by the conductor under test, which unlocks the locking element. The elastic component releases its elastic force, allowing the two docking units to switch from the overlapping state to the offset state and then to the docking state, thereby automatically fitting onto the conductor under test. The operation is very convenient and has a high safety factor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the structure in the overlapping state provided by an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the internal structure of the spring groove provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the housing of the first docking unit provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the housing of the second docking unit provided in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the locking member when it is unlocked according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure in the misaligned state provided in an embodiment of the present invention;

[0025] Figure 7-8 This is a structural schematic diagram of the docking state provided in an embodiment of the present invention;

[0026] Figure 9 This is a structural schematic diagram of the docking state provided in another embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Docking unit; 1.1. Housing; 1.2. Iron core; 1.3. Winding coil; 1.4. Spring piece; 1.5. Slide groove; 1.6. Slide edge; 2. Support column; 3. Rotary ring; 4. Locking element; 5. Trigger element; 6. Elastic component; 6.1. Spring groove; 6.11. First arc groove; 6.12. Transition groove; 6.13. Second arc groove; 6.2. Compression spring; 6.3. Slide column; 6.4. Inclined guide block; 7. Arc guide groove; 8. Connecting rod; 9. Blocking part. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Please see Figure 1-9The present invention provides a current transformer that can be replaced while energized, comprising two arc-shaped docking units 1, a junction box, a locking member 4, a trigger member 5, and an elastic component 6. The junction box is fixedly connected to one of the docking units 1. Each docking unit 1 includes an arc-shaped housing 1.1, an iron core 1.2 disposed within the housing 1.1, and a winding coil 1.3 wound on the iron core 1.2. The two docking units 1 are slidably engaged along a preset path by a sliding structure. Specifically, for ease of description, one of the two docking units 1 is the first docking unit 1, and the other is the second docking unit 1. The sliding structure includes a sliding ridge 1.6 fixedly mounted on the housing 1.1 of the first docking unit 1 and a sliding groove 1.5 opened on the housing 1.1 of the second docking unit 1. The length directions of the sliding ridge 1.6 and the sliding groove 1.5 are adapted to the preset path. A slider is provided at one end of the sliding ridge 1.6 that protrudes from the corresponding housing 1.1. Both sliders slide in cooperation with the sliding groove 1.5. The preset path includes a connected arc segment along the circumference of the housing 1.1 and a straight segment along the axial direction of the housing 1.1. The two connecting units always maintain a coaxial state during the sliding process.

[0031] During the sliding process between the two docking units 1, there are successively overlapping, misaligned and docking states. When the two docking units 1 are in the overlapping state, there is an axial drop and they are completely overlapping. When the two docking units 1 are in the misaligned state, there is an axial drop and they are completely misaligned. That is to say, the projection of the two docking units 1 along the axial direction is a complete circular structure. When the two docking units 1 are docked together to form a circular structure, there is no axial drop between them. In the docking state, the inner ring of the two shells 1.1 is fitted with the test wire, the docking ends of the two iron cores 1.2 are in contact and conductive, and the docking ends of the two winding coils 1.3 are in contact and conductive.

[0032] The release of elastic force by the elastic component 6 drives the two docking units 1 to switch from an overlapping state to a docking state via a staggered state. The elastic component 6 includes a spring groove 6.1 formed on the housing 1.1 of the first docking unit 1. The spring groove 6.1 includes a first arc-shaped groove 6.11, a transition groove 6.12, and a second arc-shaped groove 6.13 connected in sequence. The first arc-shaped groove 6.11 is coaxial with the arc segment and is open. The second arc-shaped groove 6.13 is coaxial with the first arc-shaped groove 6.11 and has an axial drop. One end of the second arc-shaped groove 6.13 is closed, and the other end is connected to the end of the first arc-shaped groove 6.11 through a curved transition groove 6.12. 6.1 contains a compression spring 6.2, which is made of alloy spring steel or stainless steel. One end of the compression spring 6.2 abuts against the closed end of the second arc-shaped groove 6.13, and the other end of the compression spring 6.2 is connected to a sliding post 6.3, which slides in conjunction with the first arc-shaped groove 6.11. A slanted guide block 6.4 is fixedly connected to the inner wall of the housing 1.1 of the second docking unit 1. One end of the slanted guide block 6.4 extends into the first arc-shaped groove 6.11, and the sliding post 6.3 slides in contact with the inclined surface of the slanted guide block 6.4. Preferably, as follows... Figure 9 The housing 1.1 of the first docking unit 1 is provided with an arc-shaped guide groove 7 coaxial with the first arc-shaped groove 6.11. A connecting rod 8 is slidably connected in the arc-shaped guide groove 7. The other end of the connecting rod 8 is fixedly connected to the sliding column 6.3. In this way, when the sliding column 6.3 slides out from the end of the first arc-shaped groove 6.11 away from the transition groove 6.12, the connecting rod 8 can still make the sliding column 6.3 slidably connected to the housing 1.1 of the first docking unit 1, instead of relying solely on the compression spring 6.2 to maintain stability.

[0033] The locking element 4 is used to lock the two docking units 1 in an overlapping state. The specific arrangement of the locking element 4 is as follows: a support column 2 is fixedly connected to the housing 1.1 of the first docking unit 1, a rotating ring 3 is rotatably connected to the support column 2, a torsion spring is provided between the rotating ring 3 and the support column 2, and the locking element 4 is fixedly connected to the rotating ring 3. The trigger element 5 is rod-shaped and is triggered to unlock the locking element 4 when it is squeezed by the wire being tested. The trigger element 5 is also fixedly connected to the rotating ring 3. The locking member 4 has a hook. In the stacked state, the spring force keeps the hook connected to the blocking part 9 on the housing 1.1 of the second docking unit 1. In fact, the blocking part 9 can share the protrusion of the housing 1.1 body with the axially extending groove 1.5 on the second docking unit 1. In the stacked state, the trigger member 5 is blocked in the inner ring of the housing 1.1, which facilitates the compression with the test wire. In the docking state, the trigger member 5 is always compressed by the test wire, and the trigger member 5 also plays a limiting role to prevent the docking unit 1 and the test wire from shaking. The hook back is inclined. During the process of the two docking units 1 switching from the misaligned state to the stacked state, the hook back slides and abuts against the blocking part 9, so that the conversion overcomes the spring force and rotates. The hook part avoids the blocking part 9, so that the two docking units 1 can move smoothly to the stacked state.

[0034] As a preferred technical solution, the first docking unit 1 is in the shape of a superior arc and the second docking unit 1 is in the shape of a inferior arc. This allows the spring groove 6.1 to be set as long as possible, thereby reducing the maximum compression of the compression spring 6.2 and improving the durability of the compression spring 6.2.

[0035] To improve the contact between the mating ends of the two iron cores 1.2, the mating ends of the iron cores 1.2 are designed with inclined end faces. This results in the contact surface between the mating ends of the two iron cores 1.2 being inclined in the mating state, thereby compressing the elastic force of the spring 6.2 and ensuring a tight fit between the mating ends of the two iron cores 1.2. Each end of the two winding coils 1.3 is connected to a spring piece 1.4, and each spring piece 1.4 is fixedly connected to its corresponding housing 1.1. In the mating state, the spring pieces 1.4 at the mating ends of the two winding coils 1.3 make elastic contact, thus ensuring good contact between the two winding coils 1.3.

[0036] This invention remains integrated even during unused storage, preventing the loss of individual docking units 1 or mismatch between two docking units 1. Furthermore, it maintains the docked state as much as possible during storage, keeping the compression spring 6.2 under minimal compression to ensure its performance. When needed, the two docking units 1 are first separated axially, then rotated relative to each other to switch them to the overlapping position, as shown below. Figure 1-2Then, the first docking unit 1 is clamped by a clamping tool, so that the inner rings of the two docking units 1 in the overlapping state approach the test wire. The trigger 5 is squeezed by the test wire and drives the rotating ring 3 to rotate in the direction that overcomes the torsion spring force. The rotating ring 3 drives the locking member 4 to move together, so that the hook of the locking member 4 avoids the blocking part 9, and the locking member 4 is unlocked. Figure 5 At this point, the spring force of the compression spring 6.2 is released, causing the sliding column 6.3 to slide along the first arc-shaped groove 6.11. The sliding column 6.3 presses against the inclined guide block 6.4 and moves together, thereby causing the second docking unit 1 to rotate relative to the first docking unit 1. The first docking unit 1 first rotates to a misaligned state relative to the second docking unit 1, such as... Figure 6 At this point, the slider slides to the junction of the arc-shaped area and the straight area of ​​the groove 1.5; then, due to the elastic force of the compression spring 6.2 still acting on the slider 6.3, sliding occurs between the slider 6.3 and the inclined guide block 6.4, thereby pressing down the inclined guide block 6.4, causing the first docking unit 1 to slide axially relative to the second docking unit 1, so that the two docking units 1 switch to the docking state, as shown. Figure 7-8 This allows it to be easily and safely applied to the conductor being tested.

[0037] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A current transformer that can be replaced while energized, characterized in that, include Two arc-shaped docking units, each docking unit includes an arc-shaped shell, an iron core disposed inside the shell, and a winding coil wound on the iron core; the two docking units slide and engage along a preset path through a sliding structure, the preset path including a connected arc-shaped segment along the circumference of the shell and a straight segment along the axial direction of the shell, and during the sliding process between the two docking units, they successively have: an overlapping state with axial drop and complete overlap, a misaligned state with axial drop and complete offset, and a docking state in which they dock into a circular structure. A locking element, used to lock the two docking units in an overlapping state; The trigger element releases the locking element when it is pressed by the conductor being tested; The elastic component, in the process of releasing elastic force, drives the two docking units to switch from the overlapping state to the staggered state to the docking state. In the docking state, the inner ring of the two shells is fitted with the test wire, the docking ends of the two iron cores are in contact and conductive, and the docking ends of the two winding coils are in contact and conductive.

2. The current transformer that can be replaced while energized according to claim 1, characterized in that, One of the two docking units is a first docking unit, and the other is a second docking unit. The elastic component includes a spring groove formed on the housing of the first docking unit. The spring groove includes an open first arc-shaped groove coaxial with the arc-shaped section. A compression spring is housed in the spring groove. One end of the compression spring abuts against one end of the spring groove, and the other end of the compression spring is connected to a sliding post. The sliding post slides in contact with the first arc-shaped groove. An inclined guide block is fixedly connected to the inner wall of the housing of the second docking unit. One end of the inclined guide block extends into the first arc-shaped groove, and the sliding post slides in contact with the inclined surface of the inclined guide block.

3. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, The first docking unit is in the shape of a superior arc, and the second docking unit is in the shape of a inferior arc.

4. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, The housing of the first docking unit has an arc-shaped guide groove, and a connecting rod is slidably connected inside the arc-shaped guide groove. The other end of the connecting rod is fixedly connected to the sliding column.

5. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, A support column is fixedly connected to the housing of the first docking unit, and a rotating ring is rotatably connected to the support column. A torsion spring is provided between the rotating ring and the support column, and the locking element and the triggering element are both fixedly connected to the rotating ring. The locking member has a hook portion, which is used to hook onto the blocking portion on the housing of the second docking unit when the unit is in the stacked state, and the trigger member is blocked inside the inner ring of the housing. The hook back is inclined, and during the process of switching from the misaligned state to the overlapping state, the hook back slides and abuts against the blocking part.

6. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, The sliding structure includes a sliding ridge fixedly disposed on the housing of the first docking unit and a sliding groove formed on the housing of the second docking unit. The length direction of the sliding ridge and the sliding groove are adapted to a preset path. A slider is provided at one end of the sliding ridge that protrudes from the corresponding housing. Both sliders slide in cooperation with the sliding groove.

7. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, When the two iron cores are docked, their docking ends are inclined, and the spring force of the compression spring makes the docking ends of the two iron cores fit tightly together.

8. A current transformer that can be replaced while energized, as described in claim 2, is characterized in that, The spring groove also includes a second arc-shaped groove that is coaxial with the first arc-shaped groove and has an axial drop. One end of the second arc-shaped groove is closed, and the other end is connected to the end of the first arc-shaped groove through a curved transition groove.

9. A current transformer that can be replaced while energized, as described in claim 1, characterized in that, Each of the two winding coils has a spring piece connected to its two ends. Each spring piece is fixedly connected to the corresponding housing. When the two winding coils are mated, the spring pieces at the mating ends of the two winding coils are in elastic contact.

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