A pluggable modular current transformer

Abstract

The present invention relates to the technical field of mutual inductors, in particular to a pluggable modular current mutual inductor, comprising: a mutual inductance mechanism, including arc mutual inductance blocks and a locking plate. A plurality of arc mutual inductance blocks are arranged in a circumferential array to form a mutual inductance ring, and the ends of two adjacent arc mutual inductance blocks are in abutment. Each arc mutual inductance block includes an arc outer shell, an arc iron core coaxially arranged inside the arc outer shell, and end connection plates symmetrically fitted and fixed at both ends of the arc outer shell. A plugging groove is formed in the middle of the side surface of the end connection plate away from the arc outer shell in the front-back direction, and an elastic metal sheet is plugged and fixed in the plugging groove. The elastic metal sheets on the two end connection plates in abutment are in contact with each other, and main locking grooves are formed in the end connection plates on both sides of the plugging groove in the front-back direction; and an installation mechanism arranged below the mutual inductance mechanism, including a base plate and a fixing hoop. The modular design of this current mutual inductor facilitates installation wiring and disassembly and replacement during use, effectively reducing the use cost and having a high safety factor.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument transformers, and particularly to a plug-in modular current transformer. Background Art

[0002] A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. A current transformer consists of an iron core and windings. Its primary side winding has very few turns and is connected in series in the circuit where the current needs to be measured. The secondary side winding has relatively more turns and is connected in series in the measuring instrument and protection circuit, converting the high current on the primary side into a standard small current on the secondary side, enabling the measuring instrument to safely and accurately obtain power system parameters. Thus, when a circuit fault occurs, it can quickly take action to prevent equipment damage and accident expansion.

[0003] For example, the existing published document CN213124130U - A Small Current Transformer for a Modular Ring Main Unit and the existing published document CN219393097U - Electronic Current Transformer both disclose a common current transformer for circuit equipment measurement. Although the existing current transformers can realize the monitoring of the circuit system, the existing current transformers still have the following deficiencies in actual use:

[0004] 1. The secondary side of the existing current transformer is an integral ring-shaped induction device. In actual use, the primary side line passes through the induction ring. This design method makes it troublesome for the staff to perform wiring operations during circuit maintenance and replacement and when increasing the number of turns of the primary side line (the primary side line is wound around the induction ring to reduce the voltage on the secondary side). Moreover, due to the integral design of the induction ring, when the coil inside the induction ring is damaged, the staff needs to remove and replace the entire current transformer, indirectly increasing the production and use costs.

[0005] 2. Since the number of turns of the primary side of the existing current transformer is much less than that of the secondary side, this results in a relatively high output voltage on the secondary side. Therefore, the secondary side of the current transformer cannot have a short circuit or an open circuit. However, in actual use, due to reasons such as circuit looseness, when an open circuit problem occurs on the secondary side, it poses a great safety hazard to the staff.

[0006] Therefore, it is necessary to improve the existing technology to solve the above technical problems. Summary of the Invention

[0007] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0008] In view of the problem that the existing electromagnetic ring design of the integrated current transformer is troublesome in actual installation, maintenance and replacement operations, a plug-in modular current transformer is proposed.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: A plug-in modular current transformer, comprising: a mutual inductance mechanism, including arc mutual inductance blocks and a locking plate. A plurality of arc mutual inductance blocks are arranged in a circumferential array to form a mutual inductance ring, and the ends of two adjacent arc mutual inductance blocks are in abutment. Each arc mutual inductance block includes an arc outer shell, an arc iron core coaxially arranged inside the arc outer shell, and end connection plates symmetrically fitted and fixed at both ends of the arc outer shell. A plug-in groove is formed in the middle of the side surface of the end connection plate away from the arc outer shell in the front-rear direction, and an elastic metal sheet is inserted and fixed in the plug-in groove. The elastic metal sheets on two abutting end connection plates are in abutment. Main locking grooves are formed in the end connection plates on both sides of the plug-in groove in the front-rear direction. A U-shaped notch for clearance fit with the locking plate is formed in the arc outer shell in front of the main locking groove. At the same time, an auxiliary locking groove aligned with the main locking groove is formed in the arc outer shell behind the main locking groove. A locking rod for clearance fit with the aligned main locking grooves on two abutting end connection plates is fixed on one side surface of the locking plate, and the free end of the locking rod passes through the auxiliary locking groove and is fixed in cooperation with the arc outer shell through a locking bolt; and an installation mechanism arranged below the mutual inductance mechanism, including a base plate and fixing hoops. Fixing hoops are symmetrically sleeved outside the arc outer shell at the bottom, and the fixing hoops are fixed in cooperation with the arc outer shell through fixing bolts.

[0010] The beneficial effects of the present invention are as follows: When this kind of current transformer is in use, the abutment of the elastic metal sheets can realize the electrical conduction between two adjacent arc mutual inductance blocks, and the locking rod can realize the locking cooperation with the main locking grooves on the two end connection plates. After the locking bolt is disengaged from the locking rod by screwing, the staff can pull out the locking rod from the main locking groove, so that the disassembly between the arc mutual inductance blocks can be realized. Such a design method can modularize the mutual inductance ring into multiple independent arc mutual inductance blocks. Such a design method is convenient and low-cost for line installation, maintenance and replacement, winding, and the replacement of the induction ring itself, and has good overall practicability.

[0011] As a preferred scheme of the plug-in modular current transformer of the present invention, wherein: the end cross-section of the locking rod is integrally formed by a rectangle and trapezoids symmetrically arranged on both sides of the rectangle, and the cross-section of the main locking groove is integrally formed by a rectangle and a trapezoid on one side of the rectangle.

[0012] As a preferred embodiment of the plug-in modular current transformer of the present invention, the following is provided: an induction coil is wound around the outer side of the arc-shaped iron core, and a joint terminal for connecting the end of the induction coil is fixedly provided at the other end relative to the terminal board provided with the insertion groove; a plurality of induction coils form a series-connected induction circuit, and an outlet hole for the end wire of the entire induction circuit to pass through is provided on the bottom surface of the arc-shaped outer casing at the lowest position.

[0013] As a preferred embodiment of the plug-in modular current transformer of the present invention, the following is provided: the fixing hoop is fixedly connected to the top surface of the base plate through the support plate, and mounting holes are provided at the four corner positions of the base plate.

[0014] In view of the fact that there are certain potential safety hazards in the actual use of the existing current transformers, the plug-in modular current transformer of the present invention is further preferably improved. The following is provided: an adjusting mechanism is further included, which is arranged between the mutual inductance mechanism and the mounting mechanism. The adjusting mechanism includes a U-shaped frame, an adjusting component, a conductive plate and a protective shell; the U-shaped frame is located directly below the mutual inductance mechanism, and the open end of the U-shaped frame is fixedly provided on the top surface of the base plate. Symmetrically fixed sleeves of the first conductive columns are provided on the upper horizontal plate of the U-shaped frame, and first abutting grooves are symmetrically provided on the front and rear side walls at the lower end of the first conductive columns; the adjusting component includes a connecting plate, an electromagnetic block, a first conduction piece and a second conduction piece. Connecting strips are symmetrically fixedly provided on the rear side surface of the connecting plate, and the two first conduction pieces are respectively fixedly sleeved on the two connecting strips; the two conductive plates are arranged in parallel from left to right. A third conductive column is fixedly provided on the top surface of one side of the conductive plate, and the two third conductive columns and the two first conductive columns are arranged in one-to-one correspondence and coaxially. A second abutting groove is provided on the upper rear side wall of the third conductive column, and the first abutting groove and the second abutting groove are conductively attached through the first conduction piece; a second conduction piece for fitting with the first abutting groove on the front side of the first conductive column is also fixedly sleeved on the connecting strip. An adsorption iron sheet is embedded and fixedly provided on the front side surface of the connecting plate. The electromagnetic blocks are arranged in alignment on the front side of the adsorption iron sheet, and the mounting sleeve fixedly sleeved on the outer side of the electromagnetic block is fixedly connected to the top surface of the base plate.

[0015] As a preferred embodiment of the plug-in modular current transformer of the present invention, the following is provided: T-shaped columns are symmetrically slidably sleeved on the connecting plate on both sides of the adsorption iron sheet, and the front end of the T-shaped column is fixedly connected to the top surface of the base plate through a fixing plate. A spring is slidably sleeved on the T-shaped column between the connecting plate and the fixing plate.

[0016] As a preferred embodiment of the pluggable modular current transformer of the present invention, the following is provided: A first connection bolt is helically engaged on the top surface of the first conductive post. On the other side of the conductive plate provided with the third conductive post, a third connection bolt is helically engaged on the top surface. The third connection bolt is used for electrically connecting with the current detection mechanism, and the electromagnetic block is connected in series in the current detection mechanism. A conductive plate is fixedly provided on the bottom surface of the second conductive sheet. A second conductive post is fixedly provided on the front side of the bottom surface of the conductive plate. And a second connection bolt is helically engaged on the bottom surface of the second conductive post. The second connection bolt is used for electrically connecting with the monitoring and warning mechanism.

[0017] Another beneficial effect of the present invention is that when the current transformer is in use, the first conductive sheet is respectively attached to the first conductive post and the third conductive post to realize the electrical conduction of the current detection mechanism. In this way, the monitoring of the primary circuit during daily use can be realized. However, when the current detection mechanism fails and causes an open circuit in the current detection mechanism, the electromagnetic block will lose magnetism due to power-off. In this case, under the action of the spring reset, the connecting plate will move along the axis direction of the T-shaped post. The first conductive sheet will be separated from the first conductive post, and the second conductive sheet will be attached to the first conductive post. In this way, the current output by the current transformer will flow into the monitoring and warning mechanism to realize timely monitoring and warning, so as to provide a warning to the staff. And when the output induced current is connected to the monitoring and warning mechanism, it will not cause an open circuit at the position of the first conductive post, and the overall practicability is good.

[0018] As a preferred embodiment of the pluggable modular current transformer of the present invention, the following is provided: The vertical section of the conductive plate is in an I shape. A slot for the sliding insertion of the conductive plate is provided on the top surface of the base plate. And the conductive plate is fixed in cooperation with the base plate through a fixing bolt.

[0019] As a preferred embodiment of the pluggable modular current transformer of the present invention, the following is provided: Protective shells are arranged in an aligned manner on the front and rear sides of the U-shaped frame. And the two protective shells are fixed in cooperation with the U-shaped frame through screws. A wire passing groove is provided at the lower end position of the side wall of the front protective shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of a pluggable modular current transformer.

[0022] Figure 2 For the present invention Figure 1 The right rear view of the structure.

[0023] Figure 3 For the present invention Figure 1 Vertical sectional view of the structure in the left - right direction.

[0024] Figure 4 For the present invention Figure 1 Vertical sectional view of the structure in the front - back direction.

[0025] Figure 5 Cooperating view of the mutual - inductance ring and the locking plate in the present invention.

[0026] Figure 6 Cooperating view of the locking rod, elastic metal sheet and arc - shaped mutual - inductance block in the present invention.

[0027] Figure 7 Schematic diagram of the cooperation between the installation mechanism and the adjustment mechanism in the present invention.

[0028] Figure 8 Cooperating view of the protective shell and the base plate in the present invention.

[0029] Figure 9 Cooperating view of the conductive plate, adjustment component and U - shaped frame in the present invention.

[0030] Figure 10 Schematic diagram of the cooperation between the connecting plate, the first conduction sheet and the second conduction sheet in the present invention. Detailed implementation manners

[0031] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings of the specification.

[0032] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0033] Secondly, the so - called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other with other embodiments.

[0034] Next, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be locally enlarged out of the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included. Embodiment 1

[0035] Refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 This is the first embodiment of the present invention. This embodiment provides a pluggable modular current transformer. When the current transformer is in use, the mutual inductance mechanism 100 is used to generate a secondary current through electromagnetic induction, so as to facilitate the monitoring of the primary-side circuit, and the installation mechanism 200 is used to install and fix the mutual inductance mechanism 100 during use.

[0036] Specifically, it includes a mutual inductance mechanism 100, which includes arc mutual inductance blocks 101 and locking plates 102. A plurality of arc mutual inductance blocks 101 are arranged in a circumferential array to form a mutual inductance ring, and the ends of two adjacent arc mutual inductance blocks 101 are abutted; and an installation mechanism 200 arranged below the mutual inductance mechanism 100, which includes a base plate 201 and fixing hoops 202. Fixing hoops 202 are symmetrically sleeved on the outside of the lowermost arc outer shell 101a, and the fixing hoops 202 are fixed in cooperation with the arc outer shell 101a through fixing bolts, so as to realize the detachable installation between the fixing hoops 202 and the mutual inductance ring. The fixing hoops 202 are fixedly connected to the top surface of the base plate 201 through support plates 202a. Installation holes 201a are provided at the four corner positions of the base plate 201. The design of the installation holes 201a is for the fixed installation of the current transformer in the power distribution cabinet.

[0037] See in detail Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown in the figure, the arc mutual inductance block 101 includes an arc outer shell 101a, an arc iron core 101b coaxially arranged inside the arc outer shell 101a, and end connection plates 101c symmetrically fitted and fixed at both ends of the arc outer shell 101a. The end connection plates 101c are bonded to the arc outer shell 101a by an adhesive. A plug-in groove 101c-3 is formed in the middle of the side surface of the end connection plate 101c away from the arc outer shell 101a in the front-back direction, and an elastic metal sheet 101c-4 is inserted and fixed in the plug-in groove 101c-3. The elastic metal sheets 101c-4 on the two abutting end connection plates 101c are in abutment. An induction coil 101b-1 is wound around the outside of the arc iron core 101b. A protective layer, preferably a fireproof layer, is filled between the arc iron core 101b and the arc outer shell 101a. A connection terminal 101c-1 for connecting the end of the induction coil 101b-1 is fixed at the other end of the end connection plate 101c opposite to the one provided with the plug-in groove 101c-3. A plurality of induction coils 101b-1 form a series-connected induction circuit. An outlet hole 101a-2 for the end wire of the entire induction circuit to pass through is formed in the bottom surface of the arc outer shell 101a at the bottommost position.

[0038] When the above settings are in use, the connection terminal 101c-1 and the elastic metal sheet 101c-4 are electrically connected by a conducting wire. The induction coil 101b-1 is connected to the connection terminal 101c-1, and electrical conduction is carried out between the two abutting elastic metal sheets 101c-4. In this way, each induction coil 101b-1 can be connected in series to form a circuit. The primary side wire passes through the mutual inductance ring, and by energizing the primary side wire, an induced current can be generated in the induction circuit. It should be noted that two induction coils 101b-1 should be wound around the outside of the arc iron core 101b in the arc outer shell 101a at the bottommost position. One end of each of the two induction coils 101b-1 is connected to the connection terminal 101c-1, and one end of the other induction coil 101b-1 passes through the outlet hole 101a-2 to realize the wiring of the secondary current.

[0039] For details, see Figure 5 and Figure 6As shown in the figure, main locking grooves 101c-2 are provided on the terminal connection plates 101c on both sides of the insertion groove 101c-3 along the front-back direction. A U-shaped notch 101a-1 for clearance fit with the locking plate 102 is provided on the arc-shaped outer shell 101a in front of the main locking groove 101c-2. At the same time, an auxiliary locking groove 101a-3 aligned with the main locking groove 101c-2 is provided on the arc-shaped outer shell 101a behind the main locking groove 101c-2. A locking rod 102a for clearance fit with the aligned main locking grooves 101c-2 on the two abutting terminal connection plates 101c is fixedly provided on one side of the locking plate 102. The free end of the locking rod 102a passes through the auxiliary locking groove 101a-3 and is fixedly fitted with the arc-shaped outer shell 101a through a locking bolt 102b. In this way, after the locking rod 102a is inserted into the main locking groove 101c-2, the limit fixation of the cooperation between the two abutting terminal connection plates 101c is realized, so as to realize the cooperation fixation between two adjacent arc-shaped mutual inductance blocks 101. The design of the auxiliary locking groove 101a-3 can further improve the firmness of the cooperation between the locking rod 102a and the arc-shaped outer shell 101a. In actual use, the disassembly and installation of the two arc-shaped mutual inductance blocks 101 can be realized by screwing the locking bolt 102b.

[0040] Furthermore, the end cross-section of the locking rod 102a is integrally formed by a rectangle and trapezoids symmetrically arranged on both sides of the rectangle. The cross-section of the main locking groove 101c-2 is integrally formed by a rectangle and a trapezoid on one side of the rectangle. In this way, the locking rod 102a can be fitted in the two main locking grooves 101c-2 for limit locking. Embodiment 2

[0041] Referring to Figure 7 、 Figure 8 、 Figure 9 and Figure 10 This is the second embodiment of the present invention. Based on the previous embodiment, the difference is that in order to avoid damage to the current transformer itself and great danger to the staff due to too high voltage output by the secondary of the current transformer when there is an open circuit or other situations in the secondary current detection mechanism, an adjustment mechanism 300 is proposed for early warning protection.

[0042] Specifically, it further includes an adjustment mechanism 300 arranged at the position between the mutual inductance mechanism 100 and the installation mechanism 200. The adjustment mechanism 300 includes a U-shaped frame 301, an adjustment component 302, a conductive plate 303 and a protective shell 304;

[0043] The U-shaped frame 301 is located directly below the mutual inductance mechanism 100, and the open end of the U-shaped frame 301 is fixedly arranged on the top surface of the base plate 201. Symmetrically fixed sleeves of the first conductive columns 301a are arranged on the upper horizontal plate of the U-shaped frame 301. A first wiring bolt 301a-1 is in screw fit with the top surface of the first conductive column 301a. The first wiring bolt 301a-1 is used to be respectively connected with two outgoing line ends on the induction circuit, and first abutting grooves 301a-2 are symmetrically arranged on the front and rear side walls at the lower end of the first conductive column 301a;

[0044] The adjusting component 302 includes a connecting plate 302a, an electromagnet 302b, a first conduction sheet 302d and a second conduction sheet 302e. Symmetrically fixed connection bars 302a-2 are arranged on the rear side surface of the connecting plate 302a, and two first conduction sheets 302d are respectively fixedly sleeved on the two connection bars 302a-2; Two conductive plates 303 are arranged in parallel from left to right. A third conductive column 303a is fixedly arranged on the top surface of one side of the conductive plate 303, and the two third conductive columns 303a and the two first conductive columns 301a are coaxially arranged in one-to-one correspondence. A second abutting groove 303a-1 is arranged on the upper rear side wall of the third conductive column 303a, and the first abutting groove 301a-2 and the second abutting groove 303a-1 are conductively attached through the first conduction sheet 302d. A third wiring bolt 303b is in screw fit with the top surface of the other side of the conductive plate 303 provided with the third conductive column 303a. The third wiring bolt 303b is used to be electrically connected with the current detection mechanism, and the electromagnet 302b is connected in series in the current detection mechanism. Thus, when the current detection mechanism monitors the secondary current, the electromagnet 302b will adsorb and position the connecting plate 302a by generating magnetism;

[0045] When the above settings are in use, the current induced by the induction circuit sequentially passes through the first wiring bolt 301a-1, the first conductive column 301a, the first conduction sheet 302d, the third conductive column 303a, the conductive plate 303 and the third wiring bolt 303b and is conducted to the current detection mechanism, so as to form a monitoring electrical loop. The current detection mechanism at least includes a current detector, a resistor, etc.

[0046] Further, the vertical cross-section of the conductive plate 303 is in an I shape. A slot 201b for the sliding insertion of the conductive plate 303 is arranged on the top surface of the base plate 201, and the conductive plate 303 is fixedly matched with the base plate 201 through a fixing bolt, so that the detachable connection between the conductive plate 303 and the base plate 201 can be realized.

[0047] For details, see Figure 8 、 Figure 9 and Figure 10As shown, a second conduction sheet 302e for fitting with a first engagement groove 301a-2 on the front side of the first conductive post 301a is fixedly sleeved on the connection bar 302a-2. An adsorption iron sheet 302a-1 is fitted and fixed on the front side surface of the connection plate 302a. The electromagnetic block 302b is arranged in alignment with the front side of the adsorption iron sheet 302a-1, and the mounting sleeve 302b-1 fixedly sleeved on the outer side of the electromagnetic block 302b is fixedly connected to the top surface of the base plate 201. A conduction plate 302e-1 is fixedly provided on the bottom surface of the second conduction sheet 302e. A second conductive post 302e-2 is fixedly provided on the front side of the bottom surface of the conduction plate 302e-1, and a second connection bolt 302e-3 is in screw fit with the bottom surface of the second conductive post 302e-2. The second connection bolt 302e-3 is used for electrical connection with the monitoring and warning mechanism;

[0048] T-shaped posts 302c are symmetrically and slidably sleeved on the connection plate 302a on both sides of the adsorption iron sheet 302a-1 to realize the limit and guidance during the movement of the connection plate 302a. The front ends of the T-shaped posts 302c are fixedly connected to the top surface of the base plate 201 through fixing plates 302c-2. A spring 302c-1 is slidably sleeved on the T-shaped posts 302c at the position between the connection plate 302a and the fixing plate 302c-2;

[0049] When the current detection mechanism is open-circuited during use, the electromagnetic block 302b will lose magnetism accordingly, thus losing the magnetic adsorption on the adsorption iron sheet 302a-1. In this way, under the action of the reset of the spring 302c-1, the connection plate 302a moves along the axis direction of the T-shaped post 302c, resulting in the separation of the first conduction sheet 302d from the first conductive post 301a, and the circuit of the current detection mechanism is open-circuited. The second conduction sheet 302e is connected to the first conductive post 301a. In this way, the current generated by induction in the induction circuit sequentially passes through the first connection bolt 301a-1, the first conductive post 301a, the second conduction sheet 302e, the second conductive post 302e-2, the second connection bolt 302e-3 and the monitoring and warning mechanism, so as to form a warning electrical circuit. The monitoring and warning mechanism at least includes an alarm, a series voltage-dividing resistor group, etc. Moreover, this warning electrical circuit can effectively avoid the problem of open circuit at the position of the first conductive post 301a;

[0050] In addition, it should be noted that when the current detection mechanism is short-circuited, the electromagnetic block 302b will also be burned out due to the short circuit. In this way, the electromagnetic block 302b will still lose its magnetic state. Of course, this situation belongs to a minor situation, and this device is mainly used for the protection when the current detection mechanism is open-circuited.

[0051] Further, protective cases 304 are arranged in alignment on the front and rear sides of the U-shaped frame 301, and the two protective cases 304 are fixedly coupled to the U-shaped frame 301 by means of screws. The protective cases 304 are used to protect the adjusting mechanism 300 against dust, water, etc. A wire passing groove 304a is formed at the lower end of the side wall of the protective case 304 on the front side, and the wire passing groove 304a is used for the incoming and outgoing wiring of the monitoring and warning mechanism.

[0052] In addition, it should be noted that the components not described in detail in this article are of the prior art.

[0053] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number or position of discrete elements may be changed or altered. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0054] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (that is, those features that are not relevant to the currently considered best mode of implementing the present invention or those features that are not relevant to the implementation of the present invention).

[0055] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine work of design, manufacturing and production.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A plug-in modular current transformer, characterized in that: include, A mutual inductance mechanism (100) comprises an arc mutual inductance block (101) and a locking plate (102); a plurality of the arc mutual inductance blocks (101) are arranged in a circumferential array to form a mutual inductance ring, and the ends of two adjacent arc mutual inductance blocks (101) abut against each other; the arc mutual inductance block (101) comprises an arc shell (101a), an arc iron core (101b) coaxially arranged inside the arc shell (101a), and terminal plates (101c) symmetrically embedded and fixedly arranged at both ends of the arc shell (101a); an insertion groove (101c-3) is provided in the middle of a side surface of the terminal plate (101c) away from the arc shell (101a) along the front-to-back direction, and an elastic metal sheet (101c-4) is inserted and fixedly arranged in the insertion groove (101c-3); the elastic metal sheets (101c-4) on the two abutting terminal plates (101c) abut against each other, and the insertion groove (101c-3) is provided with a plurality of locking plates (102 ... The terminal plates (101c) on both sides of the groove (101c-3) are provided with main lock grooves (101c-2) along the front-to-back direction, the arc shell (101a) on the front side of the main lock groove (101c-2) is provided with a U-shaped notch (101a-1) for clearance fit of the locking plate (102), and the arc shell (101a) on the rear side of the main lock groove (101c-2) is provided with a U-shaped notch (101a-1) for clearance fit of the locking plate (102). ), a locking rod (102a) is fixedly provided on one side surface of the locking plate (102) for respectively engaging with the main locking grooves (101c-2) aligned with the two terminal plates (101c) abutting against each other, and a free end of the locking rod (102a) passes through the auxiliary locking groove (101a-3) and is engaged and fixed with the arc housing (101a) by a locking bolt (102b); and, The mounting mechanism (200) is arranged below the mutual inductance mechanism (100), comprising a base plate (201) and a fixing hoop (202), the fixing hoop (202) being symmetrically sleeved on the outer side of the arc housing (101a) located at the bottom, and the fixing hoop (202) is fixed to the arc housing (101a) by means of fixing bolts; An induction coil (101b-1) is wound around the outside of the circular arc iron core (101b), and a connector terminal (101c-1) for connecting the end of the induction coil (101b-1) is fixedly provided at the other end of the terminal plate (101c) provided with an insertion groove (101c-3); A plurality of induction coils (101b-1) form a series-connected induction circuit, and a wire outlet hole (101a-2) for passing the end wires of the entire induction circuit is provided on the bottom surface of the arc housing (101a) at the bottom.

2. A plug-in modular current transformer according to claim 1, characterized in that: The end cross section of the locking rod (102a) is formed by a rectangle and a trapezoidal shape symmetrically arranged on both sides of the rectangle, and the cross section of the main locking groove (101c-2) is formed by a rectangle and a trapezoidal shape on one side of the rectangle.

3. A plug-in modular current transformer according to claim 1, characterized in that: The fixing hoop (202) is fixedly connected to the top surface of the base plate (201) via a support plate (202a), and mounting holes (201a) are provided at four corners of the base plate (201).

4. The pluggable modular current transformer according to claim 1, characterized in that: It also includes an adjustment mechanism (300) disposed between the mutual inductance mechanism (100) and the mounting mechanism (200), wherein the adjustment mechanism (300) includes a U-shaped frame (301), an adjustment component (302), a conductive plate (303), and a protective shell (304); The U-shaped frame (301) is located directly below the mutual inductance mechanism (100), and the open end of the U-shaped frame (301) is fixedly mounted on the top surface of the base plate (201), a first conductive column (301a) is symmetrically fixedly sleeved on the upper transverse plate of the U-shaped frame (301), and first abutment grooves (301a-2) are symmetrically provided on the front and rear side walls of the lower end of the first conductive column (301a); The adjustment component (302) comprises a connecting plate (302a), an electromagnetic block (302b), a first conductive sheet (302d) and a second conductive sheet (302e); connecting strips (302a-2) are symmetrically fixedly arranged on the rear side surface of the connecting plate (302a), and two first conductive sheets (302d) are respectively fixedly sleeved on the two connecting strips (302a-2); Two conductive plates (303) are arranged in parallel on the left and right sides, a third conductive column (303a) is fixedly provided on the top surface of one side of the conductive plate (303), and the two third conductive columns (303a) are coaxially arranged in a one-to-one correspondence with the two first conductive columns (301a), a second abutting groove (303a-1) is provided on the rear side wall of the upper end of the third conductive column (303a), and the first abutting groove (301a-2) and the second abutting groove (303a-1) are abutted and conductively connected via a first conductive sheet (302d); The connecting strip (302a-2) is also fixedly sleeved with a second conductive sheet (302e) for fitting with a first abutting groove (301a-2) on the front side of the first conductive column (301a); an adsorption iron sheet (302a-1) is fixedly embedded on the front side of the connecting plate (302a); the electromagnetic block (302b) is aligned and arranged on the front side of the adsorption iron sheet (302a-1); and the mounting sleeve (302b-1) fixedly sleeved on the outside of the electromagnetic block (302b) is fixedly connected to the top surface of the base plate (201).

5. A plug-in modular current transformer as claimed in claim 4, characterized in that: T-shaped columns (302c) are symmetrically and slidably sleeved on the connecting plates (302a) on both sides of the adsorption iron sheet (302a-1), and the front ends of the T-shaped columns (302c) are fixedly connected to the top surface of the base plate (201) via fixing plates (302c-2), and springs (302c-1) are slidably sleeved on the T-shaped columns (302c) between the connecting plates (302a) and the fixing plates (302c-2).

6. A plug-in modular current transformer as claimed in claim 5, characterized in that: A first connecting bolt (301a-1) is screwed on the top surface of the first conductive column (301a), and a third connecting bolt (303b) is screwed on the top surface of the other side of the conductive plate (303) on which the third conductive column (303a) is provided, the third connecting bolt (303b) being used for electrical connection to a current detection mechanism, and the electromagnetic block (302b) is connected in series in the current detection mechanism; A conductive plate (302e-1) is fixedly provided on the bottom surface of the second conductive sheet (302e), a second conductive column (302e-2) is fixedly provided on the front side of the bottom of the conductive plate (302e-1), and a second connecting bolt (302e-3) is screwed on the bottom surface of the second conductive column (302e-2), and the second connecting bolt (302e-3) is used for electrical connection with a monitoring and early warning mechanism.

7. A plug-in modular current transformer according to claim 6, characterized in that: The vertical cross-section of the conductive plate (303) is in an I-shape, a slot (201b) for slidingly inserting the conductive plate (303) is provided on the top surface of the base plate (201), and the conductive plate (303) is fixed to the base plate (201) by means of fixing bolts.

8. The pluggable modular current transformer according to claim 4, characterized in that: Protective shells (304) are aligned on the front and rear sides of the U-shaped frame (301), and the two protective shells (304) are fixed to the U-shaped frame (301) by screws, and a threading groove (304a) is provided at the lower end of the side wall of the protective shell (304) located at the front side.

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