Waterproof open type current transformer

Abstract

The application discloses a waterproof open type current transformer, which comprises a transformer upper part, a transformer lower part and a waterproof gasket, one end of the transformer upper part and the transformer lower part is connected through a rotating shaft structure, the other end is locked together through a locking structure, the waterproof gasket is arranged at the connection of the transformer upper part and the transformer lower part, the transformer upper part comprises an upper shell, a wire pressing sheet, an upper iron core and an upper cover plate, the upper shell, the wire pressing sheet, the upper iron core and the upper cover plate form an automatic wire clamp structure, a silica gel pad is arranged between the upper iron core and the upper cover plate, and the silica gel pad is pasted at the top center of the upper iron core through glue. The application fixes the transformer on the cable through the design of an automatic wire clamping function, achieves the IP68 protection level through the design of multiple waterproof silica gel pads, reduces the installation time, enhances the reliability of the power electrical monitoring system and prolongs the service life.

Description

Technical Field

[0001] This invention relates to the field of power Internet of Things (IoT) application technology, specifically a waterproof open-type current transformer. Background Technology

[0002] To measure the current in conductors that carry alternating current, such as power cables, current transformers (CTs) have traditionally been used. These transformers consist of a coil wound around a ring-shaped iron core, and a secondary coil generates a current corresponding to the primary current by appropriately transforming the value of the primary current of the wire passing through a hole in the center of the iron core into a lower value.

[0003] When traditional current transformers are used in existing power distribution system renovation projects, the power supply must first be disconnected, the busbars and busbars dismantled, the busbars passed through the current transformer's through-hole, and then the busbars and busbars installed. This traditional method not only affects users' normal power supply, but also introduces many uncontrollable factors and poses potential dangers due to the need to dismantle the busbars and busbars; it also requires a greater investment in manpower and resources.

[0004] Open-type current transformers allow for installation by opening the transformer's magnetic circuit, passing the busbars and busbars through the transformer's core hole, and then closing the magnetic circuit. This eliminates the need to modify existing power distribution lines, avoiding power outages and the need to disassemble busbars and busbars, while also saving manpower and resources, leading to their increasingly widespread use. However, because the magnetic circuit of an open-type current transformer is cut open, the core is directly exposed to the air. When used in humid outdoor or indoor environments, the core cross-section is prone to moisture absorption and rust, resulting in decreased transformer accuracy, reduced stability, and even malfunction. Therefore, waterproof open-type current transformers are urgently needed.

[0005] Currently, most open-type current transformers on the market are manufactured using either a glue-filling and cutting method or a hard-fitting method for the transformer core. This method, involving glue-filling and cutting the entire core and casing before assembly, is complex, resulting in low performance and instability. Due to the different outer diameters of various cables, a gap exists between the inner hole of the current transformer and the cable sheath, making it impossible to secure the current transformer. Fixing it with cable ties or rubber filling the inner hole requires using nylon cable ties to bind the current transformer to the cable or filling the current transformer with rubber pads. This increases installation time and affects aesthetics. In some outdoor applications, the current transformer needs good waterproof capabilities; otherwise, water will penetrate the transformer core, causing rust on the mating surfaces, thus affecting the transformer's performance and lifespan. Currently, the highest protection rating for open-type current transformers on the market is only IP67, which is insufficient for applications in harsh environments such as water immersion or cable trenches. Summary of the Invention

[0006] The purpose of this invention is to provide a waterproof open-type current transformer that uses an automatic wire clamping function to fix the transformer to the cable and achieves an IP68 protection rating through a multi-layer waterproof silicone pad design, thereby reducing installation time.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a waterproof openable current transformer, comprising an upper part of the transformer, a lower part of the transformer, and a waterproof gasket. Both the upper and lower parts of the transformer are semi-circular ring structures. One end of each part is connected by a rotating shaft, and the other end is locked together by a locking structure. The waterproof gasket is located at the connection between the upper and lower parts of the transformer. The upper part of the transformer includes an upper shell, pressure plates, an upper core, and an upper cover plate. The upper shell has an upper groove, and each of the inner walls on both sides of the upper groove has a mounting position for mounting the pressure plates. There are two pressure plates, which are installed in the mounting positions respectively. The pressure plates are used to fix the sensor on the power cable and prevent the current sensor from sliding. The pressure plates have multiple mounting holes from top to bottom. The upper iron core is installed in the upper groove and is set between the two pressure plates. The upper cover plate is set on the upper iron core. The lower end of the upper cover plate is provided with two rows of support columns. The number of support columns in each row matches the number of mounting holes on the pressure plates. The lower end of the support column is provided with a spring. The support column is inserted into the mounting hole. A silicone pad is provided between the upper iron core and the upper cover plate. The silicone pad is glued to the center of the top of the upper iron core. The silicone pad has a certain degree of elasticity.

[0008] Furthermore, protruding guide blocks are provided on the left and right side walls of the mounting position. The guide blocks are used to guide the pressure plate. Square limiting blocks are recessed inward on the inner side wall of the mounting position. Multiple limiting blocks are provided to prevent the pressure plate from falling. The shape of the pressure plate matches the mounting position. Sliding grooves are provided on both the left and right sides of the pressure plate. The size of the sliding grooves matches the size of the guide blocks of the mounting position. The sliding grooves cooperate with the guide blocks of the mounting position to allow the pressure plate to be quickly installed into the mounting position.

[0009] Furthermore, a limiting groove is formed on the outer wall of the pressure piece corresponding to the position of the limiting block. The lower end of the limiting groove is connected to the bottom of the pressure piece, and the upper end of the limiting groove is closed. The limiting block of the mounting position is inserted into the limiting groove of the pressure piece, and the limiting block abuts against the top of the limiting groove. Furthermore, the mounting hole is parallel to the slide groove and is not vertically connected.

[0010] Furthermore, the top of the pressure plate has an arc-shaped structure forming an upper arc surface, the curvature of which is consistent with the inner ring curvature of the upper cover plate. Horizontal bearing surfaces are provided on both the left and right sides of the bottom of the pressure plate, and an arc-shaped structure forms a clamping surface between the two bearing surfaces. The clamping surface is used to clamp the power cable.

[0011] Furthermore, a support platform is provided at the lower end of the support column, and a spring is installed on the support platform. The spring extends out of the end of the support column, and the support column is inserted into the mounting hole. One end of the spring abuts against the bottom of the mounting hole, and the other end abuts against the support platform of the support column, so that an elastic connection structure is formed between the upper cover plate and the pressure plate.

[0012] Furthermore, the lower part of the current transformer includes a lower shell, a lower iron core, a lead wire, and a lower cover plate. The lower shell is a semi-circular ring structure, and the lower shell and the upper shell form a circular ring structure. Both end faces of the bottom of the lower shell are provided with protruding fixing blocks. The fixing blocks are square structures, and sealing grooves are opened around the bottom of the fixing blocks. The sealing grooves are used to embed waterproof gaskets. The body of the lower shell has a lower groove, and the lower iron core is installed in the lower groove. The lower cover plate is set on the outer edge of the lower groove, thereby sealing the lower iron core in the lower groove. A circular hole is opened at the axial position of the lower shell, and the lead wire extends into the lower shell from the circular hole.

[0013] Furthermore, the bottom ends of the outer walls on the left and right sides of the upper shell are respectively provided with a rotating shaft connecting end and an upper locking ring, and the bottom ends of the outer walls on the left and right sides of the lower shell are respectively provided with a rotating shaft fixing end and a lower locking ring. The rotating shaft fixing end and the rotating shaft connecting end are connected by a rotating shaft. The position of the lower locking ring corresponds to the position of the upper locking ring, and the lower locking ring and the upper locking ring are fixed together by bolts.

[0014] Furthermore, the waterproof gasket is installed on the fixing block. The waterproof gasket is made of rubber material and includes a base. The base has a square structure and can be fitted onto the outer periphery of the fixing block. The lower middle part of the base extends horizontally outward to form a sealing ring. The sealing ring is set at the connection between the upper and lower shells to prevent water from entering the shell. The upper middle part of the base extends downward at an angle to form a water-blocking ring, which can effectively prevent water from entering the upper shell.

[0015] Furthermore, the waterproof gasket is fitted onto the fixing block from top to bottom, with the bottom of the waterproof gasket embedded in the sealing groove around the fixing block, and the sealing ring located at the connection between the upper and lower shells.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The automatic clamping structure allows the current transformer to be automatically clamped onto the cable, eliminating the need for cable ties or rubber fillers to fix the current transformer, making installation and operation simple and convenient. 2. The silicone pad design with multiple waterproof structures achieves an IP68 waterproof and dustproof rating, which is the highest level of waterproof and dustproof protection and is one level higher than the existing solutions on the market. 3. The iron core is aligned using an elastic structure. The lower half of the iron core with winding is fixed, while the upper half of the iron core without winding is aligned with the lower half of the iron core using silicone or other elastic methods. When the current transformer is closed, the upper half of the iron core can automatically align and fit with the lower half of the iron core. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the waterproof open-type current transformer described in this invention; Figure 2 This is an exploded view of the waterproof open-type current transformer described in this invention; Figure 3 For the appendix Figure 1 The top view of the upper shell is shown. Figure 4 For the appendix Figure 2 The diagram shows the structure of the pressure plate. Figure 5 For the appendix Figure 1 The diagram shows the structure of the waterproof gasket. Figure 6 For the appendix Figure 1 The cross-sectional view of the waterproof gasket shown is shown. Figure 7 This is a diagram showing the usage state of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 , Figure 2 This invention provides a waterproof open-type current transformer, comprising an upper transformer part 1, a lower transformer part 2, and a waterproof gasket 3. Both the upper transformer part 1 and the lower transformer part 2 are semi-circular ring structures. One end of the upper transformer part 1 and the lower transformer part 2 are connected by a rotating shaft structure, and the other end is locked together by a locking structure. The waterproof gasket 3 is set at the connection between the upper transformer part 1 and the lower transformer part 2, and serves a waterproof function.

[0020] The upper part 1 of the current transformer includes an upper shell 11, a pressure plate 12, an upper iron core 13, and an upper cover plate 14. The upper shell 11 has a semi-circular ring structure. The inner ring of the upper shell 11 is used to clamp the power cable. The upper shell 11 is made of insulating materials such as plastic or rubber. The bottom ends of the outer walls on the left and right sides of the bottom of the upper shell 11 are respectively provided with a shaft connection end 115 and an upper locking ring 116. The shaft connection end 115 is used to install the shaft. The upper locking ring 116 is used to lock with the lower part 2 of the current transformer. The two end faces of the bottom of the upper shell 11 are provided with square waterproof grooves 112. The waterproof grooves 112 are used to embed waterproof gaskets 3.

[0021] The upper shell 11 has an upper groove 111, which is used to install the pressure plate 12 and the upper iron core 13, such as Figure 3 , Figure 4 As shown, each of the left and right inner walls of the upper groove 111 has a mounting position 113. The mounting position 113 is a flat structure and is used to mount the pressure plate 12. The left and right side walls of the mounting position 113 have protruding guide blocks 114 for guiding the pressure plate 12. The inner wall of the mounting position 113 has inwardly recessed square limiting blocks 117. Multiple limiting blocks 117 are provided to prevent the pressure plate 12 from falling off. There are two pressure plates 12, which are installed in the mounting position 113. The pressure plates 12 are used to fix the sensor on the power cable and prevent the current sensor from sliding. The pressure plates 12 are made of nylon or ABS plastic materials. The shape matches the mounting position 113. Sliding grooves 121 are provided on both the left and right sides of the pressure piece 12. The size of the sliding grooves 121 matches the size of the guide block 114 of the mounting position 113. The sliding grooves 121 and the guide block 114 of the mounting position 113 cooperate to allow the pressure piece 12 to be quickly installed into the mounting position 113. A limiting groove 122 is provided on the outer wall of the pressure piece 12 corresponding to the position of the limiting block 117. The lower end of the limiting groove 122 is connected to the bottom of the pressure piece 12, and the upper end of the limiting groove 122 is closed. During installation, the limiting block 117 of the mounting position 113 is inserted into the limiting groove 122 of the pressure piece 12. The limiting block 117 abuts against the top of the limiting groove 122, thereby limiting the pressure piece 12 and preventing the pressure piece 12 from falling off.

[0022] The pressure plate 12 has multiple mounting holes 123, which are parallel to the sliding groove 121 and do not extend vertically through it. The number of mounting holes 123 can be set according to the size of the current transformer; the larger the current transformer, the more mounting holes 123 are required. In this embodiment, three mounting holes 123 are provided. The top end of the pressure plate 12 has an arc-shaped structure forming an upper arc surface, and the curvature of the upper arc surface is consistent with the curvature of the inner ring of the upper cover plate 14. 2. Horizontal bearing surfaces are provided on both the left and right sides of the bottom end. An arc-shaped structure between the two bearing surfaces forms a clamping surface for clamping the power cable. The upper iron core 13 is installed in the upper groove 111 and positioned between the two pressure plates 12. The upper iron core 13 has an arc-shaped structure. The upper cover plate 14 is positioned above the upper iron core 13. The upper cover plate 14 has an arc-shaped structure and its size matches that of the upper groove 111. The upper cover plate 14 is used to seal the upper iron core 13 within the upper groove 111. Inside, the lower end of the upper cover plate 14 is provided with two rows of support columns 141. The number of support columns 141 in each row matches the number of mounting holes 123 on the pressure plate 12. The lower end of the support column 141 is provided with a support platform (not shown in the figure). A spring is installed on the support platform, and the spring extends out of the end of the support column 141. The support column 141 is inserted into the mounting hole 123. One end of the spring abuts against the bottom of the mounting hole 123, and the other end abuts against the support platform of the support column 141, so that an elastic connection structure is formed between the upper cover plate 14 and the pressure plate 12. When the pressure plate 12 clamps the power cable, due to the action of the spring, the spring will deform and generate downward pressure. The pressure plate 12 will move upward under the force, thereby clamping the power cable. Based on the above structural features, the upper shell 11, the pressure plate 12, the upper iron core 13 and the upper cover plate 14 constitute an automatic wire clamp structure. The automatic wire clamp structure can automatically clamp the power cable and prevent it from falling off, and can adapt to power cables with different outer diameters.

[0023] A silicone pad 15 is provided between the upper iron core 13 and the upper cover plate 14. The silicone pad 15 is glued to the center of the top of the upper iron core 13. The silicone pad 15 has a certain elasticity. Under normal conditions, the upper iron core 13 and the upper cover plate 14 press the silicone pad 15 tightly. When the current transformer closes and clamps the power cable, the pressure plate 12 will push the upper cover plate 14 upward. At the same time, due to the elastic properties of the silicone pad, a certain pressure is maintained between the upper iron core 13 and the upper cover plate 14, which can make the two mating surfaces of the upper and lower iron cores fit together well.

[0024] The lower part 2 of the current transformer includes a lower shell 21, a lower iron core 22, a lead wire 23, and a lower cover plate 24. The lower shell 21 has a semi-circular annular structure and is made of insulating materials such as plastic or rubber. The lower shell 21 and the upper shell 11 form a circular annular structure. The bottom ends of the outer walls on the left and right sides of the lower shell 21 are respectively provided with a rotating shaft fixing end 211 and a lower locking ring 212. The rotating shaft fixing end 211 and the rotating shaft connecting end 115 are connected by a rotating shaft to form a rotating shaft structure, thereby enabling the upper shell 11 to... With the pivot as the center, the lower locking ring 212 is positioned corresponding to the upper locking ring 116. The lower locking ring 212 and the upper locking ring 116 are fixed together by bolts, thereby locking the lower shell 21 and the upper shell 11 together. The two end faces of the bottom of the lower shell 21 are provided with protruding fixing blocks 213. The fixing blocks 213 are square structures, and sealing grooves 214 are opened around the bottom of the fixing blocks 213. The sealing grooves 214 are used to embed the waterproof gaskets 3 to achieve a water-blocking effect. The lower shell 21 has a lower groove 215, and the lower iron core 22 is installed in the lower groove 215. Preferably, the lower iron core 22 is glued to the inner wall of the lower cover plate 24, so that the lower iron core 22 and the lower cover plate 24 become an integral structure. The lower cover plate 24 is located on the outer edge of the lower groove 215, thereby sealing the lower iron core 22 in the lower groove 215. A circular hole is opened at the axial position of the lower shell 21, and the lead wire 23 extends from the circular hole into the lower shell 21.

[0025] The waterproof gasket 3 is installed on the fixing block 213. The waterproof gasket 3 is made of rubber material and is used to prevent water from entering the current transformer. Figure 5 , Figure 6 As shown, the waterproof gasket 3 includes a base 31, which has a square structure. The base 31 can be fitted onto the outer periphery of the fixing block 213. The lower middle part of the base 31 extends horizontally outward to form a sealing ring 32, which is located at the connection between the upper shell 11 and the lower shell 21 to prevent water from entering the shell. The upper middle part of the base 31 extends downward at an angle to form a water-blocking ring 33, which can effectively prevent water from entering the upper shell 11. During installation, the waterproof gasket 3 is fitted onto the fixing block 213 from top to bottom. The bottom of the waterproof gasket 3 is embedded in the sealing groove around the fixing block 213. At this time, the sealing ring 32 is attached to the bottom of the lower shell 21. When the upper shell 11 and the lower shell 21 are closed, the sealing ring 32 is exactly at the connection between the upper shell 11 and the lower shell 21. The water-blocking ring 33 is embedded in the waterproof groove 112 of the upper shell 11. The inclined structure of the water-blocking ring 33 can effectively prevent water from entering the upper shell. The bottom, side and top surfaces of the waterproof gasket 3 are pressed against the upper shell 11 and the lower shell 21, thereby achieving a triple waterproof structure and greatly improving the waterproof effect.

[0026] As a further improvement of the present invention, a label layer 5 is affixed to the outer surface of both the upper cover plate 14 and the lower cover plate 24. The label layer 5 is used to print or record relevant information of the current transformer to facilitate maintenance and use.

[0027] The working principle of this invention is as follows: like Figure 7 As shown, during use, the upper part 1 and the lower part 2 of the current transformer are connected to form an openable ring structure by passing the rotating shaft through the rotating shaft connecting end 115 and the rotating shaft fixing end 211. During testing, after the current transformer is opened, the power cable is inserted. When the current transformer is closed, the pressure plate 12 will press on the power cable first. As the current transformer closes, the pressure plate 12 will push upward under the action of the spring, forming a continuous pressure on the power cable to form an automatic clamp structure. At this time, the pressure plate 12 will push the upper cover plate 14 upward. At the same time, due to the elastic properties of the silicone pad, a certain pressure is maintained between the upper iron core 13 and the upper cover plate 14, which can make the two mating surfaces of the upper and lower iron cores fit together well. Finally, the lower locking ring 212 and the upper locking ring 116 are fixed together with bolts, thereby locking the upper part 1 and the lower part 2 of the current transformer together.

[0028] This invention employs an automatic clamping structure, eliminating the need for cable ties or rubber fillers to secure the current transformer. It automatically clamps the power cable to prevent it from falling off, making installation simple and convenient. It can also adapt to power cables of different outer diameters. The invention features a multi-layered waterproof silicone pad design, achieving an IP68 waterproof and dustproof rating, the highest level. It also utilizes a core elastic mating structure. The lower half of the core with winding is fixed in an elastic manner, while the upper half without winding is secured with silicone or other elastic methods. When the transformer is closed, the upper half of the core automatically aligns and fits flush with the lower half.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waterproof open-type current transformer, comprising an upper part (1), a lower part (2), and a waterproof gasket (3), characterized in that: The upper part (1) and the lower part (2) of the current transformer are both semi-circular ring structures. One end of the upper part (1) and the lower part (2) of the current transformer are connected by a rotating shaft structure, and the other end is locked together by a locking structure. The waterproof gasket (3) is set at the connection between the upper part (1) and the lower part (2) of the current transformer. The upper part (1) of the current transformer includes an upper shell (11), pressure plates (12), an upper iron core (13), and an upper cover plate (14). The upper shell (11) has an upper groove (111) on its main body. There is a mounting position (113) on the inner wall of the upper groove (111) on both the left and right sides. There are two pressure plates (12), which are installed in the mounting positions (113) respectively. Multiple mounting holes (123) are opened on the pressure plates (12) from top to bottom. The upper iron core (13) is installed in the upper groove (111) and is located between the two pressure plates (12). The upper cover plate (14) is located on the upper groove (111). The upper end of the iron core (13) and the lower end of the upper cover plate (14) are provided with two rows of support columns (141). The number of support columns (141) in each row matches the number of mounting holes (123) on the pressure plate (12). The lower end of the support column (141) is provided with a spring. The support column (141) is inserted into the mounting hole (123). A silicone pad (15) is provided between the upper iron core (13) and the upper cover plate (14). The silicone pad (15) is glued to the center of the top of the upper iron core (13). The silicone pad (15) has a certain elasticity. The two end faces of the bottom of the upper shell (11) are provided with square waterproof grooves (112). The lower part (2) of the current transformer includes a lower shell (21), which is a semi-circular ring structure. The lower shell (21) and the upper shell (11) form a circular ring structure. The two end faces of the bottom of the lower shell (21) are provided with protruding fixing blocks (213). The fixing blocks (213) are square structures. Sealing grooves (214) are opened around the bottom of the fixing blocks (213). The waterproof gasket (3) is installed on the fixing blocks (213). The waterproof gasket (3) is made of rubber material. The waterproof gasket (3) includes a base (31), which is a square structure. The base (31) can be fitted onto the fixing blocks. (213) The upper outer periphery, the middle and lower part of the base (31) extends horizontally outward to form a sealing ring (32), the sealing ring (32) is set at the connection between the upper shell (11) and the lower shell (21), the middle and upper part of the base (31) extends downward to form a water-blocking ring (33), the water-blocking ring (33) can effectively prevent water from entering the upper shell (11), the bottom of the waterproof gasket (3) is embedded in the sealing groove (214); when the upper shell (11) and the lower shell (21) are closed, the sealing ring (32) is located at the connection between the upper shell (11) and the lower shell (21), and the water-blocking ring (33) is embedded in the waterproof groove (112) of the upper shell (11).

2. The waterproof open-type current transformer according to claim 1, characterized in that: The mounting position (113) has raised guide blocks (114) on its left and right side walls. The inner side wall of the mounting position (113) is recessed to form a square limiting block (117). Multiple limiting blocks (117) are provided. The shape of the pressure piece (12) matches the mounting position (113). The pressure piece (12) has a sliding groove (121) on both the left and right sides. The size of the sliding groove (121) matches the size of the guide block (114) of the mounting position (113). The sliding groove (121) and the guide block (114) of the mounting position (113) cooperate to allow the pressure piece (12) to be quickly installed into the mounting position (113).

3. The waterproof open-type current transformer according to claim 2, characterized in that: A limiting groove (122) is provided on the outer wall of the pressure piece (12) corresponding to the position of the limiting block (117). The lower end of the limiting groove (122) is connected to the bottom of the pressure piece (12), and the upper end of the limiting groove (122) is closed. The limiting block (117) of the mounting position (113) is inserted into the limiting groove (122) of the pressure piece (12), and the limiting block (117) abuts against the top of the limiting groove (122).

4. The waterproof open-type current transformer according to claim 2, characterized in that: The mounting hole (123) is parallel to the slide groove (121) and is not vertically connected.

5. The waterproof open-type current transformer according to claim 1, characterized in that: The top of the pressure plate (12) is an arc-shaped structure forming an upper arc surface. The arc of the upper arc surface is consistent with the arc of the inner ring of the upper cover plate (14). Horizontal bearing surfaces are provided on both the left and right sides of the bottom of the pressure plate (12). An arc-shaped structure forms a clamping surface between the two bearing surfaces.

6. The waterproof open-type current transformer according to claim 1, characterized in that: The lower end of the support column (141) is provided with a support platform, and a spring is installed on the support platform. The spring extends out of the end of the support column (141), and the support column (141) is inserted into the mounting hole (123). One end of the spring abuts against the bottom of the mounting hole (123), and the other end abuts against the support platform of the support column (141), so that an elastic connection structure is formed between the upper cover plate (14) and the pressure plate (12).

7. The waterproof open-type current transformer according to claim 1, characterized in that: The lower part (2) of the current transformer also includes a lower iron core (22), a lead wire (23), and a lower cover plate (24). The body of the lower shell (21) has a lower groove (215). The lower iron core (22) is installed in the lower groove (215). The lower cover plate (24) is set on the outer edge of the lower groove (215) and seals the lower iron core (22) in the lower groove (215). A round hole is opened at the axial position of the lower shell (21). The lead wire (23) extends from the round hole into the lower shell (21).

8. The waterproof open-type current transformer according to claim 7, characterized in that: The bottom of the outer walls on the left and right sides of the upper shell (11) is provided with a rotating shaft connecting end (115) and an upper locking ring (116), respectively. The bottom of the outer walls on the left and right sides of the lower shell (21) is provided with a rotating shaft fixing end (211) and a lower locking ring (212), respectively. The rotating shaft fixing end (211) and the rotating shaft connecting end (115) are connected by a rotating shaft. The position of the lower locking ring (212) corresponds to the position of the upper locking ring (116). The lower locking ring (212) and the upper locking ring (116) are fixed together by bolts.

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