Metering current transformer with quickly-detachable wiring terminal

Abstract

The utility model relates to the technical field of mutual inductors, in particular to a metering current mutual inductor, a wiring terminal comprises two threaded inserts made of copper and conductively connected with coils at the head end and the tail end of a coil in the mutual inductor respectively, and the threaded inserts are embedded into an epoxy resin layer; two threaded holes are formed in each threaded insert, and bolts are arranged in the threaded holes in a threaded fit mode; the wiring terminal further comprises two metal pressing blocks which are stacked and pressed on the threaded insert, and the two metal pressing blocks are respectively an upper pressing block and a lower pressing block. The two bolts respectively penetrate through the two threaded through holes of the upper pressing block and the other two threaded through holes of the lower pressing block and are in threaded connection with the two threaded holes of the threaded insert; the groove of the upper pressing block and the groove of the lower pressing block are attached to form a wire pressing cavity for containing and pressing an external wire. The upper pressing block and the lower pressing block are conductively connected with an external wire in the wire pressing cavity; the mutual inductor can be quickly and conductively connected with the external wire through the wiring terminal, and the external wire is prevented from being crushed when the bolt is tightened.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a metering current transformer. Background Art

[0002] A metering current transformer is a device used to measure current in a power system. It is mainly used to convert high current into low current in order to measure and monitor the current in the power system.

[0003] When connecting the metering current transformer to other electrical equipment, you need to first peel off the outer rubber layer of the wire, then loosen the bolts pre-installed on the insert until they are loose, then bend the wire into a ring shape, put the ring of the wire on the bolt, and finally use a tool to screw the bolt into the insert and tighten the bolt to compress the wire.

[0004] However, when the bolts tighten the wires, the tightening force cannot be controlled stably. If it is too tight, the wires may be damaged, while if it is too loose, the wires may be loose or not connected firmly, resulting in poor contact or even disconnection between the terminal and the wire, leaving a safety hazard. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the problems existing in the above-mentioned prior art, the present utility model is proposed.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A metering current transformer with a quick-detachable terminal block comprises a transformer, the transformer is provided with two terminal blocks, and the transformer is wrapped with an epoxy resin layer;

[0009] The wiring terminal comprises two copper threaded inserts which are respectively connected to the coils at the first and second ends of the coil in the transformer, and the threaded inserts are embedded in the epoxy resin layer;

[0010] Each threaded insert is provided with two threaded holes, and bolts are provided in the threaded holes in a threaded manner;

[0011] The terminal block also includes two stacked metal pressing blocks pressed on the threaded insert, respectively referred to as an upper pressing block and a lower pressing block;

[0012] The upper pressing block is provided with two threaded through holes corresponding to the positions of the threaded inserts;

[0013] The lower pressing block is provided with two other threaded through holes corresponding to the positions of the threaded inserts;

[0014] Two bolts pass through the two threaded holes of the upper pressing block and the other two threaded holes of the lower pressing block respectively, and are threadedly connected with the two threaded holes of the threaded insert;

[0015] The bottom surface of the upper pressing block is provided with a groove, and the top surface of the lower pressing block is provided with another groove;

[0016] The groove of the upper pressing block fits with the groove of the lower pressing block to form an inner cavity for accommodating and pressing the external wire, which is called the wire pressing cavity;

[0017] The upper pressing block and the lower pressing block are electrically connected to the external wire in the wire pressing cavity.

[0018] The above design, firstly, sets the metal upper pressing block and the lower pressing block, fixes the upper pressing block and the lower pressing block on the threaded insert with bolts, and uses the upper pressing block and the lower pressing block to clamp the external wires of other electrical equipment to connect the current transformer to other electrical equipment with the connection terminal, and connects the current transformer to other electrical equipment without removing the bolts, and uses the upper pressing block and the lower pressing block to clamp the external wires, making the wire connection more convenient and quick, and secondly, sets the grooves on the upper pressing block and the lower pressing block to form a wire clamping cavity to accommodate the external wires, and the upper pressing block and the lower pressing block clamp the external wires with the grooves to ensure that the external wires will not be damaged when the bolts are tightened, and finally, each threaded insert is provided with two threaded holes, and the upper pressing block and the lower pressing block are provided with corresponding threaded through holes, and the two bolts fix the upper pressing block and the lower pressing block, and after the bolts are loosened, the upper pressing block and the lower pressing block can only slide up and down along the bolts and will not rotate, so that the grooves of the upper pressing block and the lower pressing block can be docked, and the transformer can be quickly connected to the external wires of other electrical equipment through the terminal block.

[0019] Preferably, the upper pressing block and the lower pressing block are both made of copper; the copper pressing block ensures the conductive connection between the external wires and the upper pressing block and the lower pressing block, ensuring that the mutual inductor can be quickly conductively connected to other electrical equipment.

[0020] Preferably, the groove of the upper pressing block is provided with a strip groove and an annular groove, the strip groove penetrates into the annular groove, and the annular groove is called a fitting groove; another groove of the lower pressing block is provided with a strip groove and annular groove, the strip groove penetrates into the annular groove, and the annular groove is called a clamping groove; the fitting groove and the clamping groove are superimposed to form an annular cavity, and the annular cavity serves as a part of the wire clamping cavity; a corrugated washer made of stainless steel metal is provided in the clamping groove of the lower pressing block for clamping the external wire in the wire clamping cavity; the corrugated washer is entirely coated with a tin layer with a thickness of 0.1-0.5mm; the external wire in the wire clamping cavity is arranged to be embedded in and fit into the wire clamping cavity in an annular shape; the corrugated washer in the clamping groove is opposite to the fitting groove; by providing the clamping groove and the fitting groove, the corrugated washer pushes the external wire to the contact with the wire The wire pressing cavity is tightly fitted, and the external wire is tightly fitted with the wire pressing cavity without damaging the external wire, thereby reducing the resistance at the connection. The fitting groove is set as a ring structure, so that a larger area of ​​the external wire can be attached to the upper pressure block, and the fitting area is larger, which further reduces the resistance when the terminal is connected to the external wire, and the external wire will not be pulled out of the wire pressing cavity, thereby ensuring that the conductive connection of the wire is stable. A corrugated washer made of stainless steel metal is arranged in the wire pressing cavity to press the external wire tightly to ensure that the wire will not have poor contact due to unstable connection, and a layer of tin layer is wrapped outside the corrugated washer to increase the conductivity of the corrugated washer without damaging the external wire, thereby achieving that the terminal can clamp the external wire without crushing the external wire and ensure its conductivity, thereby ensuring the safe use of the current transformer.

[0021] Preferably, the bolt adopts an external hexagonal bolt, and a cross groove is provided on the top of the hexagonal head of the bolt; the bolt adopts a bolt made of stainless steel metal; by using an external hexagonal bolt and providing a cross groove on the top of the hexagonal head, the tightening and loosening of the bolt is facilitated, thereby facilitating the rapid removal and installation of external wires, and the bolt made of stainless steel metal ensures that the connection of the terminal is stable and conductive.

[0022] Preferably, the threaded insert is provided with a cavity structure that separates the threaded hole, which is called an idle cavity; the two sections of threaded holes separated by the idle cavity are respectively called a lower threaded hole located below the idle cavity and an upper threaded hole located above the idle cavity; the screw rod of the bolt is provided with a cylindrical structure that separates the upper threaded structure of the screw rod, which is called an idle rod; the two sections of the screw rod separated by the idle rod are respectively called a lower screw rod located below the idle rod and an upper screw rod located above the idle rod; the length of the lower screw rod is less than the length of the idle cavity; the length of the idle rod is greater than the length of the upper threaded hole; when the bolt is loosened, the lower screw rod will be placed in the idle cavity, and the idle rod will idle at the upper threaded hole, but the lower screw rod will be stuck at the upper threaded hole and will not fall out easily, thereby preventing the bolt from falling into the electrical equipment and causing dangers such as short circuit.

[0023] Preferably, a metal spring washer and a flat washer are sleeved on the screw rod of the bolt, the flat washer is pressed on the upper pressure block, the spring washer is pressed on the flat washer, and the hexagonal head of the bolt is pressed on the spring washer; by providing the spring washer and the flat washer, firstly, the bolt is prevented from loosening, and secondly, the bolt is prevented from damaging the upper pressure block of the copper structure, thereby improving the stability of the overall structure at the terminal.

[0024] Optimization, the column structure with the thread groove provided on the threaded insert is set as a non-rotating structure, and an annular groove is provided in the middle of the column structure; firstly, the non-rotating structure of the column structure with the thread groove is provided to ensure that the threaded insert will not rotate in the epoxy resin layer, and secondly, the annular groove is provided to make the threaded insert stuck in the epoxy resin layer and not easy to fall off, thereby ensuring that the threaded insert is not easy to fall off and improving the stability of the overall structure at the terminal.

[0025] The optimization also includes a cover covering the two wiring terminals, called an anti-electricity theft cover, which is detachably connected to the epoxy resin layer; by setting the anti-electricity theft cover and setting a lead seal on the anti-electricity theft cover, it is prevented from others tampering with or short-circuiting the wires connected to the secondary winding wiring terminals to steal electricity, and the wiring terminals are protected to prevent them from being affected by the external environment and causing unstable connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0027] Figure 1 A schematic diagram of the overall structure of a wiring terminal in a metering current transformer with a quick-detachable wiring terminal according to an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a structure in which a wiring terminal of a metering current transformer with a quick-detachable wiring terminal is connected to an epoxy resin layer according to an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of a cross-sectional structure of a wiring terminal in a metering current transformer with a quick-detachable wiring terminal according to an embodiment of the utility model;

[0030] Figure 4 The utility model provides an exploded structural diagram of a terminal block part in a metering current transformer with a quick-detachable terminal block according to an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] 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.

[0033] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, 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.

[0034] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1

[0036] Reference Figure 1 to Figure 3 This embodiment provides a metering current transformer with a quick-detachable terminal block, including a transformer, the transformer is provided with two terminal blocks, and the transformer is wrapped with an epoxy resin layer.

[0037] The terminal block includes two copper threaded inserts 1 which are respectively connected to the coils at the ends of the coil in the transformer, and the threaded inserts 1 are embedded in the epoxy resin layer; each threaded insert 1 is provided with two threaded holes, and the threaded holes are provided with bolts 2 in thread matching; the terminal block also includes two stacked metal pressing blocks pressed on the threaded inserts 1, which are respectively called upper pressing blocks 3 and lower pressing blocks 4; the upper pressing block 3 is provided with two threaded through holes corresponding to the positions of the threaded inserts 1; the lower pressing block 4 is provided with a threaded through hole corresponding to the position of the threaded insert 1 The two bolts 2 pass through the two threaded holes of the upper pressing block 3 and the other two threaded holes of the lower pressing block 4, respectively, and are threadedly connected with the two threaded holes of the threaded insert 1; the bottom surface of the upper pressing block 3 is provided with a groove, and the top surface of the lower pressing block 4 is provided with another groove; the groove of the upper pressing block 3 and the groove of the lower pressing block 4 fit together to form an inner cavity for accommodating and compressing the external wire 5, which is called the wire clamping cavity; the upper pressing block 3 and the lower pressing block 4 are electrically connected to the external wire 5 in the wire clamping cavity; first, by setting The upper pressing block 3 and the lower pressing block 4 of the metal are fixed on the threaded insert 1 with bolts 2. The upper pressing block 3 and the lower pressing block 4 are used to clamp the external wire 5 of other electrical equipment of the current transformer with the connection terminal. The current transformer is connected to other electrical equipment without removing the bolts 2. The upper pressing block 3 and the lower pressing block 4 are used to clamp the external wire 5, making the wire connection more convenient and quick. Secondly, grooves are set on the upper pressing block 3 and the lower pressing block 4 to form a wire clamping cavity to accommodate the external wire 5. The upper pressing block 3 and The lower pressing block 4 clamps the external wire 5 with a groove to ensure that the external wire 5 will not be crushed when the bolt 2 is tightened. Finally, each threaded insert 1 is provided with two threaded holes, and the upper pressing block 3 and the lower pressing block 4 are provided with corresponding threaded through holes. The two bolts 2 fix the upper pressing block 3 and the lower pressing block 4. After the bolt 2 is loosened, the upper pressing block 3 and the lower pressing block 4 can only slide up and down along the bolt 2 and will not rotate, which is convenient for the grooves of the upper pressing block 3 and the lower pressing block 4 to dock, and it is convenient for the transformer to quickly conduct electricity and connect the external wire 5 of other electrical equipment through the terminal block.

[0038] The upper pressing block 3 and the lower pressing block 4 are both made of copper; the copper pressing block ensures the conductive connection between the external wire 5 and the upper pressing block 3 and the lower pressing block 4, ensuring that the mutual inductor can be quickly conductively connected to other electrical equipment.

[0039] The bolt 2 is an external hexagonal bolt 2, and a cross groove is provided on the top of the hexagonal head of the bolt 2; the bolt 2 is a bolt 2 made of stainless steel metal; by using the external hexagonal bolt 2 and providing a cross groove on the top of the hexagonal head, it is convenient to tighten and loosen the bolt 2, thereby facilitating the rapid disassembly and installation of the external wire 5, and the bolt 2 made of stainless steel metal ensures that the connection of the terminal is stable and conductive.

[0040] When in use, before pouring epoxy resin into the current transformer, the threaded insert 1 of the terminal block is conductively connected to the coils at both ends of the coil in the transformer, the transformer with the threaded insert 1 is placed in a casting mold, and then the epoxy resin liquid with a curing agent added is poured, and solidified to form an epoxy resin layer, ensuring that one side of the threaded hole of the threaded insert 1 will not be covered by the epoxy resin layer; then the upper pressing block 3 and the lower pressing block 4 are placed on both threaded inserts 1, and then each threaded insert 1 is equipped with two bolts 2, and the two bolts 2 pass through the threaded through holes of the upper pressing block 3 and the lower pressing block 4 respectively and threadedly cooperate with the two threaded holes on the threaded insert 1; the outer layer of glue at the connection between the external wire 5 of the conductive connection electrical equipment and the terminal block is The skin is peeled off, and then the terminal is placed into the wire clamping cavity formed by the two grooves, and the bolt 2 is tightened to clamp the external wire 5 in the wire clamping cavity. The two bolts 2 fix the upper pressing block 3 and the lower pressing block 4, which is convenient for the grooves of the upper pressing block 3 and the lower pressing block 4 to dock, so that the mutual inductor can quickly conduct electricity and connect the external wire 5 of other electrical equipment through the terminal. The upper pressing block 3 and the lower pressing block 4 clamp the external wire 5 with the groove to ensure that the external wire 5 will not be damaged when the bolt 2 is tightened. The corrugated washer 6 made of stainless steel metal presses against the external wire 5 to ensure that the wire will not have poor contact due to unstable connection, thereby ensuring that the external wire 5 of the terminal is fast, stable and safe. Just tighten the bolt 2 without damaging the wire.

[0041] Example 2

[0042] Reference Figure 1 to Figure 4 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0043] The groove of the upper pressing block 3 is provided with a strip groove and an annular groove, and the strip groove penetrates into the annular groove, and the annular groove is called a fitting groove 7; another groove of the lower pressing block 4 is provided with a strip groove and annular groove, and the strip groove penetrates into the annular groove, and the annular groove is called a clamping groove; the fitting groove 7 and the clamping groove are superimposed to form an annular cavity, and the annular cavity serves as a part of the wire clamping cavity; the clamping groove of the lower pressing block 4 is provided with a corrugated washer 6 made of stainless steel metal material for clamping the external wire 5 in the wire clamping cavity; the corrugated washer 6 is entirely coated with a tin layer with a thickness of 0.1-0.5mm; the external wire 5 in the wire clamping cavity is arranged to be embedded in and fit into the wire clamping cavity in an annular shape; the corrugated washer 6 in the clamping groove is opposite to the fitting groove 7; by providing the clamping groove and the fitting groove 7, the corrugated washer 6 pushes the external wire 5 to be tightly fitted with the wire clamping cavity , without damaging the external wire 5, the external wire 5 is tightly fitted with the wire pressing cavity, reducing the resistance at the connection, and the fitting groove 7 is set to a ring structure, so that the external wire 5 can be attached to the upper pressure block 3 over a larger area, and the fitting area is larger, further reducing the resistance when the terminal is connected to the external wire 5, and the external wire 5 will not be pulled out of the wire pressing cavity, ensuring the stable conductive connection of the wire, and a corrugated washer 6 made of stainless steel metal is arranged in the wire pressing cavity to press the external wire 5 to ensure that the wire will not have poor contact due to unstable connection, and a layer of tin layer is wrapped around the corrugated washer 6 to increase the conductivity of the corrugated washer 6 without damaging the external wire 5, so that the terminal can clamp the external wire 5 without crushing the external wire 5 and ensure its conductivity, thereby ensuring the safe use of the current transformer.

[0044] A cavity structure is provided in the threaded insert 1 for separating the threaded holes, which is called the idle cavity 8; the two sections of threaded holes separated by the idle cavity 8 are respectively called the lower threaded hole located below the idle cavity 8 and the upper threaded hole located above the idle cavity 8; a cylindrical structure is provided on the screw of the bolt 2 for separating the upper threaded structure of the screw, which is called the idle rod 9; the two sections of the screw separated by the idle rod 9 are respectively called the lower screw located below the idle rod 9 and the upper screw located above the idle rod 9; the length of the lower screw is less than the length of the idle cavity 8; the length of the idle rod 9 is greater than the length of the upper threaded hole; when the bolt 2 is loosened, the lower screw will be placed in the idle cavity 8, and the idle rod 9 will idle at the upper threaded hole, but the lower screw will be stuck at the upper threaded hole and will not fall out easily, thereby preventing the bolt 2 from falling into the electrical equipment and causing dangers such as short circuit.

[0045] A metal spring washer and a flat washer are sleeved on the screw rod of the bolt 2, the flat washer is pressed on the upper pressure block 3, the spring washer is pressed on the flat washer, and the hexagonal head of the bolt 2 is pressed on the spring washer; by arranging the spring washer and the flat washer, firstly, the bolt 2 is prevented from loosening, and secondly, the bolt 2 is prevented from damaging the upper pressure block 3 of the copper structure, thereby improving the stability of the overall structure at the terminal.

[0046] The columnar structure with a thread groove formed in the threaded insert 1 is configured as a non-rotating structure, and an annular groove is formed in the middle of the columnar structure. Firstly, the non-rotating structure of the columnar structure with a thread groove is configured to ensure that the threaded insert 1 does not rotate in the epoxy resin layer, and secondly, the annular groove is configured to prevent the threaded insert 1 from being stuck in the epoxy resin layer and from falling off easily, thereby ensuring that the threaded insert 1 does not fall off easily and improving the stability of the overall structure at the terminal.

[0047] It also includes a cover covering the two wiring terminals, called an anti-electricity theft cover, which is detachably connected to the epoxy resin layer; by setting the anti-electricity theft cover and setting a lead seal on the anti-electricity theft cover, it is prevented from others tampering with or short-circuiting the wires connected to the secondary winding wiring terminals to steal electricity, and the wiring terminals are protected to prevent them from being affected by the external environment and causing unstable connections.

[0048] When in use, first bend the external wire 5 with the outer rubber peeled off into a ring, put the bent wire in the wire pressing cavity, align and fit the circular external wire 5 with the fitting groove 7, and fit the straight section with the strip groove to increase the contact area between the external wire 5 and the upper pressing block 3. After the upper pressing block 3 and the lower pressing block 4 are put together, the corrugated washer 6 presses the wire in the wire pressing cavity, and the external wire 5 in the wire pressing cavity will not be pulled out of the wire pressing cavity. First, put a spring washer on the bolt 2 and then put a flat washer on it, and then pass it through the threaded through holes of the upper pressing block 3 and the lower pressing block 4 to connect with the threaded hole of the threaded insert 1, tighten the bolt 2, the spring washer ensures that the bolt 2 will not loosen during the operation of the current transformer, and the flat washer prevents the bolt 2 from crushing the copper upper pressing block 3. When all the wiring terminals are fixed The anti-theft cover covers the two wiring terminals, the anti-theft cover is fixed with a lead-sealed bolt 2, a steel wire is passed through the anti-theft cover and the epoxy resin layer and the steel wire is sealed with a lead seal. The anti-theft cover is provided to prevent other people from tampering with or short-circuiting the wires connected to the secondary winding wiring terminals to steal electricity, and the wiring terminals are protected to prevent them from being affected by the external environment and causing unstable connections; when the bolt 2 is loosened and the external wire 5 is replaced, the lower screw rod will be placed in the idle cavity 8, and the idle rod 9 will idle at the upper threaded hole, but the lower screw rod will be stuck at the upper threaded hole and will not fall out easily, thereby preventing the bolt 2 from falling into the electrical equipment and causing dangers such as short circuits, so that the wiring terminal can clamp the external wire 5 without crushing it and ensure its conductivity, thereby ensuring the safe use of the current transformer.

[0049] Importantly, it should be noted that the construction and arrangement of the present application shown in a number 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, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel angles and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple 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. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present utility model, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0050] Additionally, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments 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.

[0051] It should be understood 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 for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A metering current transformer with a quick-detachable terminal block, comprising a transformer, the transformer being provided with two terminal blocks, the transformer being wrapped with an epoxy resin layer, characterized in that: The wiring terminal comprises two copper threaded inserts which are respectively connected to the coils at the first and second ends of the coil in the transformer, and the threaded inserts are embedded in the epoxy resin layer; Each threaded insert is provided with two threaded holes, and bolts are provided in the threaded holes in a threaded manner; The terminal block also includes two stacked metal pressing blocks pressed on the threaded insert, respectively referred to as an upper pressing block and a lower pressing block; The upper pressing block is provided with two threaded through holes corresponding to the positions of the threaded inserts; The lower pressing block is provided with two other threaded through holes corresponding to the positions of the threaded inserts; Two bolts pass through the two threaded holes of the upper pressing block and the other two threaded holes of the lower pressing block respectively, and are threadedly connected with the two threaded holes of the threaded insert; The bottom surface of the upper pressing block is provided with a groove, and the top surface of the lower pressing block is provided with another groove; The groove of the upper pressing block fits with the groove of the lower pressing block to form an inner cavity for accommodating and pressing the external wire, which is called the wire pressing cavity; The upper pressing block and the lower pressing block are electrically connected to the external wire in the wire pressing cavity.

2. The metering current transformer with quick-detachable terminal blocks according to claim 1, characterized in that: The upper pressing block and the lower pressing block are both made of copper.

3. The metering current transformer with quick-detachable terminal blocks according to claim 2, characterized in that: The groove of the upper pressing block is provided with a strip groove and an annular groove, the strip groove penetrates into the annular groove, and the annular groove is called a fitting groove; Another groove of the lower pressing block is provided with a strip groove and an annular groove, the strip groove penetrates into the annular groove, and the annular groove is called a clamping groove; The fitting groove and the pressing groove are superimposed to form an annular cavity, and the annular cavity serves as a part of the wire pressing cavity; A corrugated washer made of stainless steel metal is arranged in the pressing groove of the lower pressing block to press the external wire in the wire pressing cavity; The whole corrugated washer is coated with a tin layer with a thickness of 0.1-0.5mm; The external wire in the wire pressing cavity is arranged in a ring shape embedded in and fitting the wire pressing cavity; The corrugated washer in the pressing groove faces the fitting groove.

4. The metering current transformer with quick-detachable terminal blocks according to claim 1, characterized in that: The bolt is an external hexagonal bolt, and a cross groove is provided on the top of the hexagonal head of the bolt; The bolts are made of stainless steel.

5. The metering current transformer with quick-detachable terminal blocks according to claim 4, characterized in that: The threaded insert is provided with a cavity structure which separates the threaded hole, which is called an idle cavity; The two threaded holes separated by the idle cavity are respectively called the lower threaded hole located below the idle cavity and the upper threaded hole located above the idle cavity; The screw rod of the bolt is provided with a cylindrical structure which separates the thread structure on the screw rod and is called an idler rod; The two sections of screw separated by the idler rod are respectively called a lower screw below the idler rod and an upper screw above the idler rod; The length of the lower screw is smaller than the length of the idle chamber; The length of the idler rod is greater than the length of the upper threaded hole.

6. The metering current transformer with quick-detachable terminal blocks according to claim 5, characterized in that: A spring washer and a flat washer made of metal are sleeved on the screw rod of the bolt, the flat washer is pressed on the upper pressing block, the spring washer is pressed on the flat washer, and the hexagonal head of the bolt is pressed on the spring washer.

7. The metering current transformer with quick-detachable terminal blocks according to claim 1, characterized in that: The column structure of the threaded insert with the thread groove is arranged as a non-rotating structure, and an annular groove is arranged in the middle of the column structure.

8. The metering current transformer with quick-detachable terminal blocks according to claim 1, characterized in that: It also includes a cover covering the two connection terminals, called an anti-electricity theft cover, and the anti-electricity theft cover is detachably connected and arranged on the epoxy resin layer.

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