Pluggable modular current transformer

Abstract

The invention relates to the technical field of mutual inductors, in particular to a plug-in type modular current transformer which comprises a mutual inductance mechanism, the mutual inductance mechanism comprises arc mutual inductance blocks and a locking plate, the multiple arc mutual inductance blocks are arranged in an array mode in the circumferential direction to form a mutual inductance ring, and the ends of every two adjacent arc mutual inductance blocks abut against each other; the arc mutual inductance block comprises an arc shell, an arc iron core coaxially arranged in the arc shell and terminating plates symmetrically embedded and fixedly arranged at the two ends of the arc shell, an inserting groove is formed in the middle of the side face, away from the arc shell, of each terminating plate in the front-back direction, and an elastic metal sheet is fixedly arranged in each inserting groove in an inserted mode; the elastic metal sheets on the two abutting end connecting plates abut against each other, and main locking grooves are formed in the end connecting plates on the two sides of the inserting groove in the front-back direction. And the installation mechanism is arranged below the mutual inductance mechanism and comprises a base plate and a fixing hoop, the current transformer adopts a modular design, so that installation, wiring, disassembly and replacement during use are facilitated, the use cost is effectively reduced, and the safety coefficient is high.

Description

Technical Field

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

[0002] The current transformer is an instrument that converts the primary side high current into the secondary side low current for measurement based on the principle of electromagnetic induction. The current transformer is composed of an iron core and a winding. Its primary side winding has few turns and is connected in series in the current line to be measured. The secondary side winding has more turns and is connected in series in the measuring instrument and protection circuit. It converts the primary side high current into a standard secondary side low current, so that the measuring instrument can safely and accurately obtain the power system parameters, so that when a circuit fault occurs, it can quickly take action to prevent equipment damage and the expansion of accidents. For example, the existing open document CN213124130U-A small current transformer for modular ring network cabinet and the existing open document CN219393097U-Electronic current transformer both disclose a common current transformer for measuring circuit equipment. Although the existing current transformer can realize the monitoring of the circuit system, the existing current transformer still has the following deficiencies in actual use: 1. The secondary side of the existing current transformer is an integrated ring-shaped induction device. In actual use, the line on the primary side passes through the induction ring. This design makes it difficult for workers to perform wiring operations when the circuit is repaired and replaced, and the number of turns of the primary side wire is increased (the primary side wire is wound around the induction ring, thereby reducing the voltage on the secondary side). In addition, the integrated design of the induction ring requires workers to dismantle and replace the entire current transformer when the coil inside the induction ring is damaged, which indirectly increases the production and use costs; 2. The existing current transformer has much fewer turns on the primary side than on the secondary side, which results in a higher output voltage on the secondary side. Therefore, the secondary side of the current transformer cannot be short-circuited or open-circuited. However, in actual use, due to loose circuits and other reasons, when a circuit is open on the secondary side, it will pose a great safety hazard to the staff; Therefore, it is necessary to improve the prior art to solve the above-mentioned technical problems. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the problem that the existing current transformer with an integrated electromagnetic ring design is troublesome in actual installation, maintenance and replacement operations, a plug-in modular current transformer is proposed.

[0005] In order 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 an arc mutual inductance block 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 abutted, the arc mutual inductance block comprises an arc shell, an arc iron core coaxially arranged inside the arc shell, and terminal plates symmetrically embedded and fixedly arranged at both ends of the arc shell, an insertion groove is opened in the middle of a side surface of the terminal plate away from the arc shell along the front-to-back direction, and an elastic metal sheet is inserted and fixedly arranged in the insertion groove, the elastic metal sheets on the two abutting terminal plates are abutted, and the ends on both sides of the insertion groove are inserted and fixedly arranged. A main locking groove is opened in the front-to-back direction on the connecting plates, a U-shaped notch for the gap matching of the locking plate is opened on the arc shell on the front side of the main locking groove, and an auxiliary locking groove aligned with the main locking groove is opened on the arc shell on the rear side of the main locking groove, a locking rod is fixed on one side surface of the locking plate for matching the gaps of the main locking grooves aligned with the two end connecting plates, and the free end of the locking rod passes through the auxiliary locking groove and is fixed to the arc shell by a locking bolt; and an installation mechanism arranged below the mutual inductance mechanism, including a base plate and a fixing hoop, a fixing hoop is symmetrically sleeved on the outer side of the arc shell at the bottom, and the fixing hoop is fixed to the arc shell by a fixing bolt.

[0006] The beneficial effects of the present invention are as follows: when the current transformer is in use, the abutment of the elastic metal sheets can realize electrical conduction between two adjacent arc mutual inductance blocks, and the locking rod can realize locking with the main locking grooves on the two terminal plates. After the locking bolt is disengaged from the locking rod by twisting the locking bolt, the staff can pull the locking rod out of the main locking groove, so that the disassembly between the arc mutual inductance blocks can be realized. This design method can modularly set the mutual inductance ring into multiple independent arc mutual inductance blocks. This design method is convenient and low-cost in line installation, maintenance and replacement, winding, and replacement of the induction ring itself, and has good overall practicality.

[0007] As a preferred solution of a plug-in modular current transformer of the present invention, the end cross-section of the locking rod is formed by a rectangle and a trapezoid symmetrically arranged on both sides of the rectangle, and the cross-section of the main locking groove is formed by a rectangle and a trapezoid on one side of the rectangle.

[0008] As a preferred solution of a plug-in modular current transformer of the present invention, an induction coil is wound around the outer side of the arc iron core, and a connector terminal for connecting the end of the induction coil is fixedly provided at the other end of the terminal plate provided with the plug-in groove; a plurality of induction coils constitute a series induction circuit, and a wire outlet hole for the end wire of the entire induction circuit to pass through is provided on the bottom surface of the arc shell at the bottom.

[0009] As a preferred solution of a plug-in modular current transformer of the present invention, 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 corners of the base plate.

[0010] In view of the fact that the existing current transformers have certain safety hazards in actual use, a plug-in modular current transformer of the present invention is further improved, wherein: it also includes an adjustment mechanism arranged between the mutual inductance mechanism and the installation mechanism, the adjustment mechanism includes a U-shaped frame, an adjustment 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 mounted on the top surface of the base plate, the upper end cross plate of the U-shaped frame is symmetrically fixedly sleeved with a first conductive column, and the front and rear side walls of the lower end of the first conductive column are symmetrically provided with a first abutting groove; the adjustment component includes a connecting plate, an electromagnetic block, a first conductive sheet and a second conductive sheet, and the rear side surface of the connecting plate is symmetrically fixed with a connecting column. The invention relates to a connecting strip, and the two first conductive sheets are respectively fixedly sleeved on the two connecting strips; the two conductive plates are arranged in parallel left and 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 are coaxially arranged in a one-to-one correspondence with the two first conductive columns, a second abutting groove is provided on the rear side wall of the upper end of the third conductive column, and the first abutting groove and the second abutting groove are abutted and conductively bonded through the first conductive sheet; a second conductive sheet for abutting 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 block is aligned and arranged 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.

[0011] As a preferred solution of a plug-in modular current transformer of the present invention, wherein: T-shaped columns are symmetrically slidably sleeved on the connecting plates on both sides of the adsorption iron sheet, and the front ends of the T-shaped columns are fixedly connected to the top surface of the base plate through fixed plates, and springs are slidably sleeved on the T-shaped columns between the connecting plates and the fixed plates.

[0012] As a preferred solution of a plug-in modular current transformer of the present invention, wherein: a first connecting bolt is spirally fitted on the top surface of the first conductive column, and a third connecting bolt is spirally fitted on the top surface on the other side of the conductive plate on which the third conductive column is provided, the third connecting bolt is used to be electrically connected to 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 column is fixedly provided on the front side of the bottom of the conductive plate, and a second connecting bolt is spirally fitted on the bottom surface of the second conductive column, and the second connecting bolt is used to be electrically connected to the monitoring and early warning mechanism.

[0013] Another beneficial effect of the present invention is that when the current transformer is in use, the first conductive sheet is respectively fitted with the first conductive column and the third conductive column to realize the electrical conduction of the current detection mechanism, so that the monitoring of the primary circuit during daily use can be realized. However, when the current detection mechanism fails and causes the current detection mechanism to be short-circuited, the electromagnetic block will lose magnetism due to power failure. In this way, under the action of the spring reset, the connecting plate will move along the axial direction of the T-shaped column, and the first conductive sheet will be separated from the first conductive column, while the second conductive sheet will be fitted with the first conductive column. In this way, the current output by the current transformer flows into the monitoring and early warning mechanism to realize timely monitoring and early warning, thereby providing early warning to the staff, and the output induced current is connected to the monitoring and early warning mechanism, and will not cause the first conductive column position to be open, and the overall practicality is good.

[0014] As a preferred solution of a plug-in modular current transformer of the present invention, the vertical cross-section of the conductive plate is I-shaped, a slot for sliding the conductive plate is provided on the top surface of the base plate, and the conductive plate is fixed to the base plate by fixing bolts.

[0015] As a preferred solution of a plug-in modular current transformer of the present invention, protective shells are aligned on the front and rear sides of the U-shaped frame, and the two protective shells are fixed to the U-shaped frame by screws, and a wire threading groove is opened at the lower end of the side wall of the protective shell on the front side. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 The figure is a schematic diagram of the overall structure of a plug-in modular current transformer.

[0017] Figure 2 For the present invention Figure 1 Right rear view of the structure.

[0018] Figure 3 For the present invention Figure 1 Vertical cross-section of the structure in the left-right direction.

[0019] Figure 4 For the present invention Figure 1 Vertical cross-section of the structure in the front-to-back direction.

[0020] Figure 5 This is a diagram of the mutual inductance ring and the locking plate to be matched in the present invention.

[0021] Figure 6 This is a diagram of the locking rod, the elastic metal sheet and the arc mutual inductance block to be matched in the present invention.

[0022] Figure 7 It is a schematic diagram of the coordination of the installation mechanism and the adjustment mechanism in the present invention.

[0023] Figure 8 This is a diagram of the protective shell and the base plate of the present invention ready to be matched.

[0024] Fig. 9 This is a diagram of the conductive plate, the adjustment assembly and the U-shaped frame to be matched in the present invention.

[0025] Fig.10 It is a schematic diagram of the coordination of the connecting plate, the first conductive sheet and the second conductive sheet in the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0030] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , which is the first embodiment of the present invention, and this embodiment provides a plug-in modular current transformer. When the current transformer is in use, the mutual inductance mechanism 100 is used to generate a secondary current by electromagnetic induction, thereby facilitating the monitoring of the primary side circuit, and the installation mechanism 200 is used to install and fix the mutual inductance mechanism 100 when in use.

[0031] Specifically, it includes a mutual inductance mechanism 100, including an arc mutual inductance block 101 and a locking plate 102, wherein 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, including a base plate 201 and a fixing hoop 202, wherein the fixing hoop 202 is symmetrically sleeved on the outer side of the arc shell 101a located at the bottom, and the fixing hoop 202 is fixed to the arc shell 101a by fixing bolts, thereby realizing detachable installation between the fixing hoop 202 and the mutual inductance ring, and the fixing hoop 202 is fixedly connected to the top surface of the base plate 201 by a support plate 202a, and mounting holes 201a are opened at four corners of the base plate 201, and the mounting holes 201a are designed for fixed installation of the current transformer in the distribution cabinet.

[0032] See Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the arc mutual inductance block 101 includes an arc shell 101a, an arc iron core 101b coaxially arranged inside the arc shell 101a, and terminal plates 101c symmetrically embedded and fixed at both ends of the arc shell 101a. The terminal plates 101c are bonded to the arc shell 101a by an adhesive. An insertion groove 101c-3 is opened 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 fixed in the insertion groove 101c-3, and the elastic metal sheets on the two terminal plates 101c that are abutted against each other are provided. 101c-4 are abutted, an induction coil 101b-1 is wound around the outer side of the arc core 101b, a protective layer is filled between the arc core 101b and the arc shell 101a, preferably a fireproof layer, a connector terminal 101c-1 for connecting the end of the induction coil 101b-1 is fixedly arranged at the other end of the terminal plate 101c provided with the insertion groove 101c-3, and multiple induction coils 101b-1 constitute a series induction circuit, and a wire outlet hole 101a-2 for the end wire of the entire induction circuit to pass through is provided on the bottom surface of the arc shell 101a located at the bottom; When the above arrangement is in use, the connector terminal 101c-1 and the elastic metal sheet 101c-4 are electrically connected through the conductive line, the induction coil 101b-1 is connected to the connector terminal 101c-1, and electrical conduction is carried out between the two elastic metal sheets 101c-4 that are in contact with each other, so that the various induction coils 101b-1 can be connected in series to form a circuit, and the primary side wire passes through the mutual inductance ring, and the primary side wire is energized to realize the induction circuit to generate current; it should be noted that the outer side of the arc core 101b in the arc shell 101a at the bottom should wrap around the two induction coils 101b-1, one end of the two induction coils 101b-1 are connected to the connector terminal 101c-1, and one end of the other induction coil 101b-1 passes through the wire outlet hole 101a-2 to realize the wiring of the secondary current.

[0033] See Figure 5 and Figure 6 As shown, the terminal plates 101c on both sides of the insertion groove 101c-3 are provided with main locking grooves 101c-2 along the front-to-back direction, and the arc shell 101a on the front side of the main locking groove 101c-2 is provided with a U-shaped notch 101a-1 for the clearance fit of the locking plate 102, and at the same time, the arc shell 101a on the rear side of the main locking groove 101c-2 is provided with an auxiliary locking groove 101a-3 aligned with the main locking groove 101c-2, and a locking rod 102a is fixed on one side surface of the locking plate 102 for clearance fit with the aligned main locking grooves 101c-2 on the two abutting terminal plates 101c, and the locking rod 102a The free end of 02a passes through the auxiliary locking groove 101a-3 and is fixed to the arc shell 101a by the locking bolt 102b, so that after the locking rod 102a is inserted into the main locking groove 101c-2, the two abutting terminal plates 101c are fixed to each other, thereby realizing the fixing of the two adjacent arc mutual inductance blocks 101, and the design of the auxiliary locking groove 101a-3 can further improve the firmness of the fitting between the locking rod 102a and the arc shell 101a. In actual use, the two arc mutual inductance blocks 101 can be disassembled and installed by twisting the locking bolt 102b.

[0034] Furthermore, the end cross-section of the locking rod 102a is formed by a rectangle and a trapezoid symmetrically arranged on both sides of the rectangle, and the cross-section of the main lock groove 101c-2 is formed by a rectangle and a trapezoid on one side of the rectangle, so that the locking rod 102a can be matched in the two main lock grooves 101c-2 for limited locking. Example 2

[0035] Reference Figure 7 , Figure 8 , Fig. 9 and Fig.10, which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but is different in that in order to avoid the situation where the secondary current detection mechanism is short-circuited, the transformer itself may be damaged and the workers may be in danger because the secondary output voltage of the current transformer is too high, so an adjustment mechanism 300 is proposed for early warning protection.

[0036] Specifically, it also includes an adjustment mechanism 300 disposed between the mutual inductance mechanism 100 and the mounting mechanism 200, and 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 fixed on the top surface of the base plate 201. The first conductive column 301a is symmetrically fixedly sleeved on the upper horizontal plate of the U-shaped frame 301. The first connecting bolt 301a-1 is screwed on the top surface of the first conductive column 301a. The first connecting bolt 301a-1 is used to be connected to the two outlet terminals of the induction circuit respectively, and the front and rear side walls of the lower end of the first conductive column 301a are symmetrically provided with first abutting grooves 301a-2. The adjustment component 302 includes a connecting plate 302a, an electromagnetic block 302b, a first conductive sheet 302d and a second conductive sheet 302e. The connecting plate 302a is symmetrically fixed with a connecting strip 302a-2 on the rear side surface, and the two first conductive sheets 302d are respectively fixedly sleeved on the two connecting strips 302a-2; the two conductive plates 303 are arranged in parallel to each other, and a third conductive column 303a is fixed 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, and the upper rear side wall of the third conductive column 303a A second abutting groove 303a-1 is provided, and the first abutting groove 301a-2 and the second abutting groove 303a-1 are abutted and conductive through the first conductive sheet 302d. A third wiring bolt 303b is screwed on 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 to the current detection mechanism, and the electromagnetic block 302b is connected in series in the current detection mechanism. In this way, when the current detection mechanism monitors the secondary current, the electromagnetic block 302b will generate magnetism to adsorb and position the connecting plate 302a. When the above arrangement is in use, the current generated by the induction of the induction circuit is sequentially conducted to the current detection mechanism through the first connecting bolt 301a-1, the first conductive column 301a, the first conductive sheet 302d, the third conductive column 303a, the conductive plate 303 and the third connecting bolt 303b, thereby forming a monitoring electrical circuit. The current detection mechanism at least includes a current detector, a resistor, etc.

[0037] Furthermore, the vertical cross-section of the conductive plate 303 is I-shaped, and a slot 201b for the sliding insertion of 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 fixing bolts, so that a detachable connection between the conductive plate 303 and the base plate 201 can be achieved.

[0038] See Figure 8 , Fig. 9 and Fig.10 As shown, a second conductive sheet 302e for fitting with the first abutting groove 301a-2 on the front side of the first conductive column 301a is fixedly sleeved on the connecting strip 302a-2, an adsorption iron sheet 302a-1 is embedded and fixedly provided 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, 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 wiring bolt 302e-3 is screwed on the bottom surface of the second conductive column 302e-2, and the second wiring bolt 302e-3 is used for electrically connecting with the monitoring and early warning mechanism; The connecting plates 302a on both sides of the adsorption iron sheet 302a-1 are symmetrically slidably sleeved with T-shaped columns 302c to achieve limiting guidance when the connecting plates 302a move, and the front ends of the T-shaped columns 302c are fixedly connected to the top surface of the base plate 201 through the fixing plates 302c-2, and the T-shaped columns 302c between the connecting plates 302a and the fixing plates 302c-2 are slidably sleeved with springs 302c-1; When the above arrangement is in use, when the current detection mechanism is disconnected, the electromagnetic block 302b will lose its magnetism, thereby losing the magnetic attraction to the adsorption iron sheet 302a-1. In this way, under the action of the spring 302c-1 being reset, the connecting plate 302a moves along the axial direction of the T-shaped column 302c, thereby causing the first conductive sheet 302d to be separated from the first conductive column 301a, the current detection mechanism circuit is disconnected, and the second conductive sheet 302e is connected to the first conductive column 301a. In this way, the current generated by the induction circuit passes through the first wiring bolt 301a-1, the first conductive column 301a, the second conductive sheet 302e, the second conductive column 302e-2, the second wiring bolt 302e-3 and the monitoring and early warning mechanism in sequence, so as to form an early warning electrical circuit. The monitoring and early warning mechanism at least includes an alarm, a series voltage-dividing resistor group, etc., and the early warning electrical circuit can effectively avoid the problem of the first conductive column 301a being open. In addition, it should be noted that when a short circuit occurs in the current detection mechanism, the electromagnetic block 302b will also burn out due to the short circuit. In this case, the electromagnetic block 302b will still lose its magnetism. Of course, this situation is a minority case. This device is mainly used for protection when the current detection mechanism is short-circuited.

[0039] Furthermore, 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. The protective shells 304 are used to provide dust and water protection for the adjustment mechanism 300. A wire threading groove 304a is provided at the lower end of the side wall of the protective shell 304 on the front side, and the wire threading groove 304a is used to monitor the incoming and outgoing wiring of the early warning mechanism.

[0040] In addition, it should be noted that the components not described in detail in this article are prior art.

[0041] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0042] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0043] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in 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) disposed below the mutual inductance mechanism (100) comprises a base plate (201) and a fixing hoop (202); the fixing hoop (202) is symmetrically sleeved on the outside 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.

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 as claimed in claim 2, characterized in that: 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.

4. The pluggable 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).

5. The pluggable modular current transformer according to claim 3, 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).

6. A plug-in modular current transformer as claimed in claim 5, 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).

7. A plug-in modular current transformer according to claim 6, 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.

8. A plug-in modular current transformer according to claim 7, 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.

9. The pluggable modular current transformer according to claim 5, 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.

Images