Outdoor combined mutual inductor

Abstract

The invention relates to the technical field of mutual inductors, and discloses an outdoor combined mutual inductor which comprises a mutual inductor body, a binding post is arranged on the mutual inductor body, a junction box is arranged on the side face of the mutual inductor body, a containing groove is formed in the side, away from the mutual inductor body, of the junction box, and an insulating partition plate is arranged in the containing groove. The containing groove is divided into a sealing cavity and a working cavity by the partition plate, a wire inlet hole communicated with the working cavity is formed in the bottom of the junction box, a cover plate used for sealing the containing groove is arranged on one side of the junction box, a plurality of junction rods inserted into the sealing cavity are arranged on the mutual inductor body, and a plurality of conductive parts are arranged on the partition plate. A wire for connecting the conductive part and the junction pole is arranged between the end, extending into the sealing cavity, of the conductive part and the junction pole, and the end, extending into the working cavity, of the conductive part is used for being electrically connected with an external cable inserted into the working cavity through the wire inlet hole.

Description

Technical Field

[0001] This application relates to the technical field of current transformers, and in particular to an outdoor combined current transformer. Background Technology

[0002] Outdoor combined instrument transformers are key equipment installed outdoors in power systems, mainly used for voltage and current measurement and protection of incoming lines.

[0003] An outdoor combined current transformer in related technology includes a housing, a junction box on the outer side of the housing, a connecting rod inside the junction box, and a nut threaded onto the connecting rod. An inlet hole communicating with the interior of the junction box is provided at the bottom of the junction box. An O-type terminal is connected to the end of an external cable. The external cable and the O-type terminal are inserted into the junction box through the inlet hole at the bottom of the junction box, then sleeved on the connecting rod, and secured to the O-type terminal with a nut.

[0004] When outdoor instrument transformers are used in substations near cement plants, mines, or other dusty environments, the air outside the transformer contains a large amount of dust, which can enter the junction box through gaps in the inlet port. After prolonged operation, dust gradually adheres to the connection between the terminal block and the O-type terminal, as well as the surrounding surface. During rainy weather or periods of high humidity, moist air or even rainwater can enter the junction box through the gaps in the inlet port, causing the dust inside the junction box to mix with the moisture in the air to form a conductive contamination layer, resulting in increased contact resistance and decreased insulation resistance. If an electric arc occurs at the connection between the terminal block and the O-type terminal, the high temperature generated by the arc can burn the surface of the terminal block or the threaded parts, leading to damage to the terminal block and loss of conductivity. This renders the instrument transformer malfunctioning, requiring power outage repair or even replacement of the entire unit.

[0005] Therefore, the existing wiring structure of outdoor instrument transformers is prone to contamination at the wiring points in dusty and humid outdoor environments, which may even lead to damage to the wiring poles, thus affecting long-term insulation reliability and operation and maintenance safety. Summary of the Invention

[0006] In order to improve the problem that the wiring parts of existing outdoor current transformers are easily contaminated in harsh outdoor environments such as high dust and high humidity, which increases the risk of damage to the wiring poles, this application provides an outdoor combined current transformer.

[0007] This application provides an outdoor combined current transformer, which adopts the following technical solution: An outdoor combined current transformer includes a current transformer body, a terminal block on the top of the current transformer body, a junction box on the side of the current transformer body, a receiving groove on the side of the junction box away from the current transformer body, an insulating partition inside the receiving groove, the partition dividing the receiving groove from top to bottom into a sealed cavity and a working cavity, an inlet hole at the bottom of the junction box communicating with the working cavity, a cover plate on the side of the junction box away from the current transformer body for sealing the receiving groove, the cover plate sealingly engaging with the opening of the receiving groove, isolating the sealed cavity from the outside when the cover plate is closed, a plurality of terminal rods inserted into the sealed cavity are provided on the current transformer body, a plurality of conductive elements are provided on the partition plate, a wire connecting the two is provided between the end of the conductive element extending into the sealed cavity and the terminal rod, and the end of the conductive element extending into the working cavity is used for electrical connection with an external cable inserted into the working cavity through the inlet hole.

[0008] By adopting the above technical solution, the terminal rod of the current transformer body is arranged in a sealed cavity surrounded by a receiving groove, a partition, and a cover plate. This places the terminal rod, wires, some conductive parts, and their connection points in a relatively clean and stable space. The external cable enters the working cavity through the inlet hole at the bottom of the junction box and is electrically connected to the lower end of the conductive part on the partition within the working cavity. This structurally isolates the wiring environment on the current transformer body side from the wiring environment on the field side. On the one hand, contaminants such as dust and moisture, which mainly enter through the inlet hole, are confined within the working cavity and cannot directly affect the seal. The wiring rods and conductors inside the cavity mitigate the deterioration trend of increasing contact resistance and decreasing insulation resistance over time, improving the long-term insulation reliability of the transformer leads. On the other hand, when an electric arc occurs at the external cable connection point inside the working cavity, its carbonization channel mainly extends along the side wall of the working cavity and near the conductive parts, and is not likely to spread into the sealed cavity, thereby reducing the risk of the wiring rod being burned and damaged. At the same time, when repairing or modifying the secondary circuit, it is only necessary to operate the external cable end inside the working cavity, avoiding frequent contact with the wiring rod on the transformer body side, improving operation and maintenance safety and extending the overall service life of the transformer.

[0009] Optionally, the partition plate has a threaded hole connecting the sealing cavity and the working cavity. The conductive component includes a conductive post threaded into the threaded hole and passing through the partition plate, and a conductive cover disposed above the partition plate. The conductive cover has a fixing groove on the side facing the partition plate for inserting the conductive post. The upper end of the conductive post abuts against the bottom wall of the fixing groove. A connecting nut is threaded onto the conductive cover. A conductive ring located below the partition plate is sleeved on the conductive post. A conductive block is disposed below the conductive ring. A conductive rod is disposed on the side of the conductive block. The conductive rod is used for hanging the O-type terminal connected to the external cable and electrically connecting it to the external cable.

[0010] By adopting the above technical solution, a conductive cover is set up to form an additional shielding and sealing structure around the conductive column, so that the sealed cavity is not connected to the working cavity, preventing dust and moisture in the working cavity from entering the sealed cavity along the circumferential gaps of the conductive column. This allows the conductive column to be reliably positioned and sealed at the partition. The conductive column, threaded into the threaded hole, abuts against the bottom wall of the fixing groove, realizing the electrical connection between the conductive column and the conductive cover. The fixing groove also provides axial restraint for the conductive column, making it less prone to loosening under long-term operation and external forces. When the conductive column is damaged, the conductive column threaded to the partition can be easily removed from the partition and replaced. The conductive ring, conductive block, and conductive rod on its side arrange the O-type terminal hanging points of the external cable in the working cavity, forming a continuous conductive path from top to bottom. The O-type terminal and the conductive rod are hung up, which facilitates the connection or separation of the O-type terminal and the conductive rod, simplifying on-site wiring and maintenance operations.

[0011] Optionally, the bottom wall of the fixing groove is provided with a groove, and a conductive spring in a compressed state is provided in the groove. One end of the conductive spring abuts against the bottom wall of the groove, and the other end of the conductive spring abuts against the end of the conductive post.

[0012] By adopting the above technical solution, the conductive spring applies a continuous axial clamping force to the end of the conductive column. Even when the end of the conductive column no longer directly abuts against the bottom wall of the fixing groove due to factors such as assembly tolerance, thermal expansion and contraction, or vibration, a reliable electrical connection between the conductive column and the conductive cover can still be achieved through the conductive spring. In addition, the conductive spring absorbs part of the axial impact and vibration load at the end of the conductive column, which helps to reduce the mechanical stress concentration of the conductive column at the partition and prevent the conductive column from loosening or the end face and threads from being hard-forced to break, thereby further improving the electrical reliability and mechanical life of the conductive connection part on the sealed cavity side.

[0013] Optionally, the conductive block is eccentrically positioned relative to the axis of the conductive column, the conductive rod is located on the side of the conductive block facing the conductive column and directly below the conductive column, and a first limiting groove is provided on the lower end face of the conductive column, and a limiting rod for contacting the upper part of the conductive rod is slidably disposed in the first limiting groove.

[0014] By adopting the above technical solution, the driving limit rod rises, hanging the O-type terminal onto the conductive rod. Without applying force to the limit rod, it descends due to its own weight and contacts the conductive rod, placing it on the path where the O-type terminal detaches from the conductive rod. This prevents the O-type terminal from easily detaching from the conductive rod when it wobbles, ensuring a stable electrical connection between the O-type terminal and the conductive component. The conductive rod extends directly below the conductive post, ensuring that when the external cable is hung through the O-type terminal, its weight direction is essentially aligned with the axis of the conductive post. This reduces the bending moment at the end of the conductive post, allowing the cable to sag naturally and avoiding excessive bending. This reduces the risk of mechanical fatigue and loosening at the connection point, improving the overall reliability of the wiring structure.

[0015] Optionally, a second limiting groove is provided on the side of the conductive post facing the conductive spring. The upper end of the first limiting groove is connected to the bottom wall of the second limiting groove. A limiting block is provided in the second limiting groove. The upper end of the limiting rod is fixedly connected to the lower end face of the limiting block. The lower end of the conductive spring abuts against the limiting block. When the limiting block abuts against the bottom wall of the second limiting groove, the end of the limiting rod away from the limiting block extends out of the post.

[0016] By adopting the above technical solution, the conductive spring also applies a downward force to the limiting rod, driving the limiting rod down until it abuts against the conductive rod. This ensures that the limiting rod remains close to the conductive rod when there is no external force. When the transformer is under vibration or the external cable is swaying, the limiting rod is less likely to move away from the conductive rod, thus providing a continuous blocking effect on the O-type terminals hanging on the conductive rod. This reduces the probability of the O-type terminals accidentally detaching from the conductive rod and helps maintain the stability of the connection between the external cable and the conductive component.

[0017] Optionally, the conductive rod is fitted with a compression spring and a pressure block. The compression spring and pressure block are arranged sequentially along the axial direction of the conductive rod between the conductive block and the limiting rod. One end of the compression spring abuts against the conductive block, and the other end of the compression spring abuts against the pressure block. When the compression spring is in its natural length state, the distance between the pressure block and the limiting rod along the axial direction of the conductive rod is less than the dimension of the O-type terminal connected to the external cable along the axial direction of the conductive rod.

[0018] By adopting the above technical solution, when the O-type terminal of the external cable is hung on the conductive rod, the O-type terminal will push the pressure block and compress the clamping spring. Under the action of the spring's restoring force, the pressure block always pushes against the limiting rod, so that the O-type terminal is clamped between the pressure block and the limiting rod on the conductive rod. Thus, when the equipment vibrates or the cable sways, the O-type terminal is not easy to slip off along the axial direction of the conductive rod, and the wiring position is more stable. At the same time, since the clamping spring can absorb part of the relative displacement and impact force, it reduces the direct impact and wear between rigid components, which is conducive to improving the reliability and service life of the O-type terminal hanging connection.

[0019] Optionally, the cover plate is vertically slidably mounted on the junction box, and the cover plate is provided with a locking mechanism for locking the cover plate in a predetermined vertical position; the cover plate has an operating groove on the side facing the junction box, and an operating hole is provided on the bottom wall of the operating groove; the locking mechanism includes an operating rod passing through the operating hole, a locking disc and a locking spring disposed in the operating groove; one side of the operating rod is connected to the locking disc, and the other end of the operating rod extends through the operating hole to the outside of the cover plate and is connected to the operating disc; the locking spring is in a compressed state, one end of the locking spring abuts against the bottom wall of the operating groove, and the other end of the locking spring abuts against the locking disc; the partition plate has a locking groove on the side facing the cover plate for the locking disc to be inserted.

[0020] By adopting the above technical solution, when the locking disc is inserted into the locking groove, the locking spring makes it difficult for the locking disc to disengage from the locking groove, thereby restricting the cover plate from moving vertically and preventing the cover plate from sliding down under operating vibration or external disturbance; ensuring the stable closed state of the junction box; when it is necessary to open the cover plate, the operating lever is driven by the operating panel to overcome the locking spring force and remove the locking disc from the locking groove, so that the cover plate can move vertically, realizing a relatively simple one-handed unlocking and opening operation. This not only improves the convenience of operation during on-site maintenance and wiring adjustment, but also avoids the wear and loss risks caused by repeated disassembly and assembly of screw-type fasteners, which is conducive to maintaining the integrity of the junction box structure and its service life.

[0021] Optionally, an operating block is provided on the outer circumferential surface of the locking disc. The partition plate has a first sliding groove located below the locking groove and a second sliding groove located on the horizontal side of the locking groove on the side facing the cover plate. Both the first and second sliding grooves are connected to the locking groove. The inner circumferential surface of the locking groove has a slide rail connecting the first and second sliding grooves. The operating block can slide within the first sliding groove, the second sliding groove, and the slide rail. The cover plate has a slot aligned with the first sliding groove and a first mounting groove aligned with the second sliding groove on the side facing the partition plate. The first mounting groove is connected to the operating groove. A first mounting block and a mounting spring are provided in the first mounting groove. One end of the mounting spring is fixedly connected to the first mounting block, and the other end of the mounting spring is fixedly connected to the bottom wall of the first mounting groove. The partition plate has a slot for inserting the first mounting block on the side facing the cover plate. The slot is connected to the second sliding groove and extends upward through the partition plate. When the mounting spring is in its natural length state, the first mounting block extends out of the cover plate.

[0022] By adopting the above technical solution, when the mounting spring is in its natural length state, the first mounting block extends into the slot. The first mounting block limits the vertical movement of the cover plate, keeping the cover plate in the position where the working cavity is open and the sealing cavity remains closed. When the operator moves the operating block from the first slide groove to the locking groove, the cover plate can only move upward due to the presence of the first mounting block. When the first mounting block abuts against the upper inner wall of the sealing cavity, it can also limit the cover plate from rising further, thus playing a limiting role. When the operator moves the operating block from the second slide groove to the corresponding position of the first mounting groove, the operating block drives the first mounting block to disengage from the slot together. At this time, the cover plate is driven to slide downward, opening the sealing cavity.

[0023] Optionally, the cover plate has an installation cavity located on the side of the first installation groove away from the operating groove, and the installation cavity communicates with the first installation groove. The cover plate has a second installation groove located on the side of the installation cavity away from the first installation groove, facing the partition. The second installation groove is located below the partition and communicates with the installation cavity. A second installation block is slidably disposed in the second installation groove and can slide along the second installation groove and be selectively inserted into the working cavity. A horizontally arranged round rod is disposed in the installation cavity. A rotating rod is sleeved on the round rod and can rotate around the round rod. A first sliding hole is disposed above the round rod and a second sliding hole is disposed below the round rod. A first sliding rod connected to the first installation block is slidably disposed in the first sliding hole, and a second sliding rod connected to the second installation block is slidably disposed in the second sliding hole. A check piece is disposed on the cover plate to restrict the movement of the first installation block. When the installation spring is in its natural length state, the second installation block does not extend outside the cover plate.

[0024] By adopting the above technical solution, when the operator moves the operating block from the second slide groove to the corresponding position of the first mounting groove, the operating block drives the first mounting block to disengage from the slot together. At the same time, the mounting spring is compressed and deformed. After the first mounting block is fully inserted into the first mounting groove, the movement of the first mounting block is restricted by the check valve. The first mounting block drives the first slide rod to move. The first slide rod drives the second slide rod and the second mounting block to move through the rotating rod, so that the second mounting block is inserted into the working cavity. The second mounting block plays a limiting role in the vertical movement of the cover plate, keeping the cover plate in the position where the sealing cavity is open and the working cavity is still closed. When the check valve is released from restricting the first mounting block, the mounting spring resets and drives the first mounting block to extend out of the first mounting groove again, and the second mounting block is disengaged from the working cavity. Thus, the controllable switching of the cover plate position and the coordinated control of the opening state of the working cavity / sealing cavity can be achieved through the same locking mechanism under different working conditions.

[0025] Optionally, the upper inner wall of the first mounting groove is provided with a slot, and a check rod is provided in the slot. The upper end face of the first mounting block is provided with a check groove for the check rod to be inserted. The inner wall of the slot away from the partition is provided with a hole, and a push rod that can slide along the axial direction of the hole is inserted into the hole. The side of the check rod facing the hole is provided with a through hole for the push rod to be inserted. The end of the check rod facing the hole is provided with an operating chamfer. The operating chamfer is located at the junction of the end face of the check rod facing the hole and the upper inner wall of the through hole. The side of the push rod away from the check rod extends out of the cover plate. The push rod is located on the path of the operating disc moving towards the cover plate. When the check rod is inserted into the check groove, the operating chamfer is located on the movement path of the push rod.

[0026] By adopting the above technical solution, when the first mounting block is fully inserted into the first mounting groove and the check groove is aligned with the slot, the check rod descends and inserts into the check groove. At this time, the mounting spring cannot drive the first mounting block to extend out of the first mounting groove again, thus mechanically limiting the position of the first mounting block. When the check rod is inserted into the check groove and in the check state, the operating chamfer is located on the movement path of the push rod. At this time, when the operating disc moves towards the cover plate, it will push the push rod into the through hole and slide up along the operating chamfer, thereby lifting the check rod and causing it to exit the check groove, thus releasing the check state from outside the cover plate. The above design can complete the check and unlocking of the first mounting block without adding additional complex mechanisms, and can also achieve one-handed operation from the outside through the linkage of the push rod and the operating disc. The structural relationship is clear and the action path is determined, which is conducive to improving the reliability of the locking mechanism under outdoor vibration conditions and reducing the possibility of misoperation.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The terminal rod of the current transformer body is arranged in a sealed cavity formed by a receiving groove, a partition, and a cover plate. This places the terminal rod, wires, some conductive parts, and their connection points in a relatively clean and stable space. The external cable enters the working cavity through the inlet hole at the bottom of the junction box and is electrically connected to the lower end of the conductive part on the partition within the working cavity. This structurally isolates the wiring environment on the current transformer body side from the wiring environment on the field side. On the one hand, contaminants such as dust and moisture, which mainly enter through the inlet hole, are confined within the working cavity and cannot directly affect the wiring environment within the sealed cavity. The poles and conductors mitigate the deterioration trend of increasing contact resistance and decreasing insulation resistance over time, improving the long-term insulation reliability of the transformer leads. On the other hand, when an electric arc occurs at the connection point of the external cable inside the working chamber, its carbonization channel mainly extends along the side wall of the working chamber and near the conductive parts, and is not likely to spread into the sealed chamber, thereby reducing the risk of the poles being burned and damaged. At the same time, when repairing or modifying the secondary circuit, it is only necessary to operate the end of the external cable inside the working chamber, avoiding frequent contact with the connection poles on the transformer body side, improving operation and maintenance safety and extending the overall service life of the transformer. 2. By installing conductive components consisting of conductive posts, conductive covers, conductive springs, conductive rings, conductive blocks, and conductive rods on the partition, and cooperating with limiting blocks, limiting rods, clamping springs, and pressure blocks to form a mechanism for hanging, clamping, and preventing the O-type terminals from detaching, the conductive posts are reliably positioned at the partition, and the contact pressure is stable. The O-type terminals are not easily loosened or slipped under vibration and shaking conditions, facilitating replacement when the conductive components are partially damaged, and further improving the mechanical strength and electrical reliability of the secondary wiring. At the same time, through the vertical sliding of the cover plate and the multi-level locking structure of the locking disc, operating block, first mounting block, second mounting block, and check valve, the open / closed states of the working chamber and the sealed chamber are controlled and interlocked in a graded manner. This allows maintenance personnel to open only the working chamber for routine wiring and maintenance as needed, and to safely open the sealed chamber when necessary, reducing the risk of misoperation and accidental exposure of the sealed chamber, thereby improving the overall protection performance and maintenance safety of the instrument transformer. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a front view of the current transformer; Figure 3 This is a partial structural diagram after the cover plate has been removed; Figure 4 It is along Figure 2 A partial sectional view of line AA in the middle; Figure 5 It is along Figure 2 A partial sectional view of the middle BB line; Figure 6 This is a schematic diagram highlighting the structure of the cover plate; Figure 7 This is a partial sectional view highlighting the check valve. Figure 8 This is a partial sectional view highlighting the internal structure of the mounting cavity; Figure 9 This is a partial structural diagram highlighting the relationship between the locking mechanism and the partition.

[0029] Reference numerals: 1. Current transformer body; 11. Connecting rod; 12. Compression nut; 2. Terminal post; 3. Support frame; 31. Assembly hole; 32. Lifting ring; 33. Handle; 4. Junction box; 41. Receiving groove; 411. Sealing cavity; 412. Working cavity; 42. Inlet hole; 43. Guide strip; 431. Guide groove; 44. Sealing ring groove; 441. Sealing ring block; 5. Partition plate; 51. Threaded hole; 52. 521. Sealing groove; 53. Locking groove; 531. First sliding groove; 532. Second sliding groove; 54. Slot; 6. Conductive component; 61. Conductive cover; 611. Fixing groove; 612. Groove; 613. Connecting nut; 62. Conductive post; 621. Second limiting groove; 622. First limiting groove; 623. Limiting block; 624. Limiting rod; 625. Conductive spring; 63. Conductive ring; 64. 65. Conductive block; 65. Conductive rod; 651. Compression spring; 652. Pressure block; 7. Wire; 71. Conductive terminal; 8. Cover plate; 81. Guide block; 82. Operating groove; 83. Operating hole; 84. First mounting groove; 841. First mounting block; 8411. Check groove; 842. Mounting spring; 85. Receiving groove; 86. Check element; 861. Check rod; 8611. Through hole; 862. Check spring; 863. Push rod; 87. Mounting cavity; 871. Round rod; 872. Rotating rod; 8721. First sliding hole; 8722. Second sliding hole; 8723. First sliding rod; 8724. Second sliding rod; 88. Second mounting groove; 881. Second mounting block; 89. Slot; 891. Slot hole; 9. Locking mechanism; 91. Locking disc; 92. Locking spring; 93. Operating block; 94. Operating lever; 95. Operating disc. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0031] This embodiment discloses an outdoor combined current transformer. (Refer to...) Figure 1 and Figure 2 An outdoor combined current transformer includes a current transformer body 1, with a terminal block 2 fixedly connected to the top of the current transformer body 1. Two support frames 3 are fixedly connected to the bottom of the current transformer body 1, and the two support frames 3 are parallel to each other. The support frames 3 have multiple mounting holes 31, through which the current transformer can be installed in a designated position by bolts passing through the mounting holes 31.

[0032] Reference Figure 1 Two lifting rings 32 are provided on the support frame 3, and the current transformer body 1 is located between the two lifting rings 32, which facilitates the lifting of the current transformer by hoisting equipment. Two handles 33 are fixedly connected to the opposite end faces of the two support frames 3, and the current transformer body 1 is located between the two lifting rings 32 on the same support frame 3. The handles 33 facilitate the handling of the current transformer by workers.

[0033] Reference Figure 2 and Figure 3 A junction box 4 is fixedly connected to the side of the current transformer body 1. A receiving groove 41 is formed on the side of the junction box 4 away from the current transformer body 1. A partition 5 is fixedly connected to the bottom wall of the receiving groove 41, and both horizontal sides of the partition 5 are fixedly connected to the inner wall of the receiving groove 41. The side of the partition 5 away from the bottom wall of the receiving groove 41 is coplanar with the side of the junction box 4 away from the current transformer body 1. The partition 5 is made of insulating material. The partition 5 divides the receiving groove 41 from top to bottom into a sealed cavity 411 and a working cavity 412. A wire inlet hole 42 is formed on the lower end face of the junction box 4, and the wire inlet hole 42 communicates with the working cavity 412.

[0034] Reference Figure 3 and Figure 4 Several connecting rods 11 are fixedly connected to the side of the current transformer body 1. Each connecting rod 11 passes through the junction box 4 and is inserted into the sealed cavity 411. When multiple connecting rods 11 are used, they are distributed along the length of the current transformer body 1. Each connecting rod 11 is externally threaded with a clamping nut 12.

[0035] Reference Figure 3 and Figure 5 The partition 5 is provided with a plurality of conductive elements 6, the number of which is the same as the number of connecting rods 11. When there are multiple conductive elements 6, they are distributed along the length of the transformer body 1. The spacing between two adjacent conductive elements 6 and two adjacent connecting rods 11 is the same. A plurality of spacers are fixedly connected to the upper end face of the partition 5, and the spacers are located between two adjacent conductive elements 6. One end of the spacer is fixedly connected to the bottom wall of the receiving groove 41, and the spacers increase the creepage distance between two conductive elements 6.

[0036] Reference Figure 3 and Figure 5 The upper surface of the partition 5 has several threaded holes 51, the number of which is the same as the number of conductive parts 6. The threaded holes 51 connect the sealing cavity 411 and the working cavity 412.

[0037] Reference Figure 3 and Figure 5 The conductive component 6 includes a conductive cover 61, a conductive post 62, a conductive ring 63, a conductive block 64, and a conductive rod 65.

[0038] Reference Figure 3 and Figure 5 The conductive cover 61 is fixedly connected to the upper end face of the partition 5, and the conductive cover 61 is located directly above the threaded hole 51. A fixing groove 611 is provided on the side of the conductive cover 61 facing the partition 5, and the fixing groove 611 communicates with the threaded hole 51. A groove 612 is provided on the bottom wall of the fixing groove 611. A connecting nut 613 is externally threaded onto the conductive cover 61.

[0039] Reference Figure 3 and Figure 5 The conductive cover 61 and the connecting rod 11 are provided with a wire 7 connecting the two. Each end of the wire 7 is connected to a conductive terminal 71, which is an O-type terminal. One conductive terminal 71 is hung on the outside of the connecting rod 11 and is pressed by a clamping nut 12; the other conductive terminal 71 is sleeved on the outside of the conductive cover 61 and is pressed by a connecting nut 613.

[0040] Reference Figure 5 The conductive post 62 is threaded into the threaded hole 51. The upper end of the conductive post 62 is inserted into the fixing groove 611, and the upper end face of the conductive post 62 abuts against the bottom wall of the fixing groove 611. A second limiting groove 621 is formed on the upper end face of the conductive post 62, and the second limiting groove 621 is aligned with the groove 612. A first limiting groove 622 is formed on the lower end face of the conductive post 62, and the upper part of the first limiting groove 622 communicates with the bottom wall of the second limiting groove 621. The opening of the first limiting groove 622 is smaller than the opening of the second limiting groove 621. In this embodiment, the opening cross-section of the first limiting groove 622 is exemplified by a square. In other embodiments, the opening cross-section of the first limiting groove 622 may be of a shape other than square.

[0041] Reference Figure 5 A limiting block 623 is provided inside the second limiting groove 621, and the limiting block 623 contacts the bottom wall of the second limiting groove 621. The limiting block 623 is made of conductive material. A limiting rod 624 is fixedly connected to the lower end face of the limiting block 623. The limiting rod 624 passes through the opening of the first limiting groove 622 and extends below the conductive post 62. A limiting chamfer is provided on the limiting rod 624, and the limiting chamfer is located at the junction of the side of the limiting rod 624 away from the bottom wall of the receiving groove 41 and the lower end face of the limiting rod 624.

[0042] Reference Figure 5 A conductive spring 625 is provided in the groove 612, and the conductive spring 625 is in a compressed state. One end of the conductive spring 625 is inserted into the second limiting groove 621 and abuts against the limiting block 623, while the other end of the conductive spring 625 abuts against the bottom wall of the groove 612.

[0043] Reference Figure 3 and Figure 5 A conductive ring 63 is sleeved around the conductive post 62, and the conductive ring 63 is located below the partition 5. The lower end face of the conductive ring 63 is coplanar with the lower end face of the partition 5. A conductive block 64 is fixedly connected to the lower end face of the conductive ring 63, and the conductive block 64 is eccentrically positioned relative to the axis of the conductive post 62.

[0044] Reference Figure 4 and Figure 5The conductive rod 65 is fixedly connected to the end face of the conductive block 64 facing the axis of the conductive post 62, and the conductive rod 65 is located directly below the conductive post 62. The external cable and the connected O-type terminal are inserted through the inlet hole 42, so that the O-type terminal connected to the external cable is hung outside the conductive rod 65, and the conductive rod 65 is located between the limiting rod 624 and the conductive block 64.

[0045] Reference Figure 4 and Figure 5 The conductive rod 65 is fitted with a compression spring 651 and a pressure block 652. One end of the compression spring 651 is fixedly connected to the conductive block 64, and the other end of the compression spring 651 is fixedly connected to the pressure block 652. When the compression spring 651 is in its natural length state, the distance between the pressure block 652 and the limiting rod 624 is less than the thickness of the O-type terminal connected to the external cable. When the O-type terminal is between the limiting rod 624 and the conductive block 64, the compression spring 651 applies a force to the pressure block 652, causing the pressure block 652 and the limiting rod 624 to clamp the O-type terminal, making it less likely for the O-type terminal to wobble on the conductive rod 65 and reducing wear between the conductive rod 65 and the O-type terminal.

[0046] Reference Figure 3 Junction box 4 is fixedly connected to two guide bars 43 away from transformer body 1. The two guide bars 43 are horizontally spaced and parallel to each other, and receiving groove 41 is located between the two guide bars 43. Guide groove 431 is opened at the end of the two guide bars 43 that are close to each other.

[0047] Reference Figure 3 and Figure 6 A cover plate 8 is provided on the side of the junction box 4 away from the transformer body 1, and the cover plate 8 is located between two guide bars 43. A guide block 81 is fixedly connected to the end face of the cover plate 8 facing the guide bar 43, and the guide block 81 is slidably disposed in the guide groove 431.

[0048] Reference Figure 3 and Figure 6 The cover plate 8 is fitted to the end face of the junction box 4 away from the transformer body 1. A sealing ring groove 44 is formed on the side of the junction box 4 facing the cover plate 8, surrounding the receiving groove 41. A sealing ring block 441 is provided inside the sealing ring groove 44. A sealing groove 52 is formed on the side of the partition plate 5 facing the cover plate 8. Connecting grooves are formed on both inner walls of the receiving groove 41 along the length of the transformer body 1. One end of the connecting groove communicates with the sealing ring groove 44, and the other end communicates with the sealing groove 52. A sealing strip 521 is provided inside the sealing groove 52, with both ends of the sealing strip 521 passing through the connecting groove and fixedly connected to the sealing ring block 441 along its length.

[0049] Reference Figure 4 and Figure 6A locking mechanism 9 is provided on the cover plate 8 to restrict the vertical movement of the cover plate 8. The locking mechanism 9 includes a locking disc 91, a locking spring 92, an operating block 93, an operating rod 94, and an operating disc 95. An operating groove 82 is provided on the side of the cover plate 8 facing the partition 5, and an operating hole 83 is provided on the bottom wall of the operating groove 82.

[0050] Reference Figure 4 and Figure 6 The cover plate 8 has a first mounting groove 84 and a receiving groove 85 on the side facing the partition plate 5. The first mounting groove 84 is located on the horizontal side of the operating groove 82. The receiving groove 85 is located directly below the operating groove 82. Both the first mounting groove 84 and the receiving groove 85 are connected to the operating groove 82.

[0051] Reference Figure 4 and Figure 6 An operating lever 94 passes through an operating hole 83. The end of the operating lever 94 furthest from the partition 5 is fixedly connected to an operating disc 95, which is located outside the cover plate 8. The side of the operating lever 94 furthest from the operating disc 95 is fixedly connected to a locking disc 91, which is located within an operating groove 82. An operating block 93 is fixedly connected to the outer circumferential surface of the locking disc 91, and the operating block 93 can move into the first mounting groove 84 / accommodating groove 85. A locking spring 92 is sleeved on the outside of the operating lever 94, and is in a compressed state. One side of the locking spring 92 abuts against the locking disc 91, and the other end of the locking spring abuts against the bottom wall of the operating groove 82.

[0052] Reference Figure 3 , Figure 4 and Figure 6 The partition 5 has a locking groove 53, a first sliding groove 531, and a second sliding groove 532 on the side facing the cover plate 8. The locking groove 53 allows the locking disc 91 to be inserted. Both the first sliding groove 531 and the second sliding groove 532 are connected to the locking groove 53. The first sliding groove 531 is located directly below the locking groove 53 and is aligned with the receiving groove 85. The second sliding groove 532 is located on the horizontal side of the locking groove 53 and is aligned with the first mounting groove 84. A slide rail is formed on the inner circumferential surface of the locking groove 53, which connects the first sliding groove 531 and the second sliding groove 532. In this embodiment, the first sliding groove 531 and the second sliding groove 532 form an angle of 90 degrees. Furthermore, the operating block 93 has a certain weight, allowing the locking disc 91 to rotate. When the operating block 93 is in the area of ​​the second sliding groove 532 located directly above the slide rail or within the slide rail, the operating block 93 can return to the second sliding groove 532 due to its own weight.

[0053] Reference Figure 6 and Figure 7A first mounting block 841 and a mounting spring 842 are disposed within the first mounting groove 84. One side of the first mounting block 841, facing the axis of the operating groove 82, contacts the outer circumferential surface of the locking disc 91. One end of the mounting spring 842 is fixedly connected to the bottom wall of the first mounting groove 84, and the other end of the first mounting groove 84 is fixedly connected to the first mounting block 841. When the mounting spring 842 is in its natural length state, the first mounting block 841 extends beyond the cover plate 8.

[0054] Reference Figure 3 and Figure 7 The partition 5 has a slot 54 on the side facing the cover plate 8. The slot 54 communicates with the second slide groove 532 and extends upward through the partition 5. The slot 54 allows the first mounting block 841 to be inserted. When the cover plate 8 is closed to both the sealing cavity 411 and the working cavity 412, the first mounting block 841 is located in the slot 54.

[0055] Reference Figure 3 , Figure 7 and Figure 8 A mounting cavity 87 is formed within the cover plate 8. The mounting cavity 87 is located on the side of the first mounting groove 84 away from the operating groove 82 and communicates with the first mounting groove 84. A second mounting groove 88 is formed on the side of the cover plate 8 facing the partition plate 5. The second mounting groove 88 is located below the partition plate 5. Furthermore, the upper inner wall of the second mounting groove 88 can be made coplanar with the lower surface of the partition plate 5. The second mounting groove 88 is located on the side of the mounting cavity 87 away from the first mounting groove 84 and communicates with the mounting cavity 87. A second mounting block 881 is slidably disposed within the second mounting groove 88.

[0056] Reference Figure 8 and Figure 9 A round rod 871 is disposed between the two inner walls of the mounting cavity 87 along the length of the cover plate 8. A rotating rod 872 is sleeved on the round rod 871, and the rotating rod 872 can rotate around the axis of the round rod 871. The rotating rod 872 has a first sliding hole 8721 and a second sliding hole 8722 on the side facing the second mounting groove 88. Both the first sliding hole 8721 and the second sliding hole 8722 are elongated holes. The round rod 871 is located between the first sliding hole 8721 and the second sliding hole 8722, and the first sliding hole 8721 is located above the second sliding hole 8722.

[0057] Reference Figure 7 and Figure 8A first mounting block 841 is fixedly connected to a first sliding rod 8723 on the side facing the rotating rod 872, and the first sliding rod 8723 is slidably disposed within the first sliding hole 8721. A second mounting block 881 is fixedly connected to a second sliding rod 8724 on the side facing the rotating rod 872, and the second sliding rod 8724 is slidably disposed within the second sliding hole 8722. When the mounting spring 842 is in its natural length state, the second mounting block 881 does not extend beyond the second mounting groove 88. In this embodiment, the distance from the first sliding rod 8723 to the axis of the round rod 871 is the same as the distance from the second sliding rod 8724 to the axis of the round rod 871. In other embodiments, the distance from the first sliding rod 8723 to the axis of the round rod 871 is greater than the distance from the second sliding rod 8724 to the axis of the round rod 871, making the rotating rod 872 a force-saving lever. During the process of the mounting spring 842 driving the first mounting block 841 to extend back from the first mounting groove 84, it is easier to drive the second mounting block 881 back into the second mounting groove 88.

[0058] Reference Figure 3 , Figure 7 and Figure 9 A check valve 86 is provided on the cover plate 8, which is used to restrict the movement of the first mounting block 841 along the axial direction of the operating groove 82. The check valve 86 includes a check rod 861, a check spring 862, and a push rod 863. A slot 89 is provided on the upper inner wall of the first mounting groove 84, and a slot hole 891 is provided on the side of the slot 89 away from the partition plate 5.

[0059] Reference Figure 7 and Figure 9 Both the check rod 861 and the check spring 862 are located within the slot 89. The upper end of the check spring 862 is fixedly connected to the upper inner wall of the slot 89, and the lower end of the check spring 862 is fixedly connected to the check rod 861. During the movement of the first mounting block 841 along the axis of the operating groove 82, the first mounting block 841 is always located directly below the slot 89. A check groove 8411 is provided on the upper end face of the first mounting block 841, which allows the check rod 861 to be inserted.

[0060] Reference Figure 7 and Figure 9 The end face of the check rod 861 facing the locking hole 891 has a through hole 8611. The check rod 861 has an operating chamfer, which is located at the junction of the end face of the check rod 861 facing the locking hole 891 and the inner wall of the through hole 8611.

[0061] Reference Figure 7 The push rod 863 passes through the locking hole 891, with the side of the push rod 863 away from the check rod 861 extending out of the cover plate 8. The push rod 863 is located on the path of the operating disc 95 moving toward the cover plate 8. When the check rod 861 is inserted into the check groove 8411, the operating chamfer is located on the moving path of the push rod 863.

[0062] The implementation principle of an outdoor combined current transformer according to an embodiment of this application is as follows: When it is necessary to open the working chamber 412, first pull the operating plate 95. The operating plate 95 drives the operating block 93 to disengage from the first slide groove 531 and enter the receiving groove 85. Then drive the cover plate 8 to rise and open the working chamber 412, so that the staff can inspect the components in the working chamber 412. Conversely, the cover plate 8 can be used to re-seal the working chamber 412. When the locking groove 53 is aligned with the operating groove 82, the locking plate 91 can be driven to re-insert into the locking groove 53.

[0063] When the sealing cavity 411 needs to be opened, the operating disk 95 is driven to rotate while the working cavity 412 is kept closed, so that the operating block 93 is rotated from the first slide groove 531 to the second slide groove 532. Then, the operating disk 95 is pulled, and the operating disk 95 drives the operating block 93 to disengage from the second slide groove 532 and enter the first mounting groove 84. During the movement of the operating block 93, the first mounting block 841 is pushed, so that the first mounting block 841 disengages from the slot 54. The first mounting block 841 drives the second mounting block 881 to move along the second mounting groove 88 towards the working cavity 412 and extend into the working cavity 412 through the first slide rod 8723 and the rotating rod 872, thus limiting the vertical stroke of the cover plate 8. When the check groove 8411 is aligned with the slot 89, the check rod 861 descends under the action of the check spring 862 and inserts into the check groove 8411, locking the first mounting block 841. At this time, the drive cover plate 8 can descend to open the sealing cavity 411. However, since the second mounting block 881 has extended into the working cavity 412, it limits the further descent of the cover plate 8, keeping the working cavity 412 closed. Conversely, when it is necessary to reseal the sealing cavity 411, first raise the cover plate 8 to the closed position of the sealing cavity 411, then press the operating plate 95. The operating plate 95 pushes the push rod 863, causing the push rod 863 to drive the check rod 861 to rise and disengage from the check groove 8411. Under the elastic force of the mounting spring 842, the first mounting block 841 is reinserted into the slot 54, and the second mounting block 881 is driven back into the second mounting groove 88 by the rotating rod 872, thereby resetting the second mounting block 881 and restoring the normal closed state of the sealing cavity 411 and the working cavity 412.

[0064] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. An outdoor combined current transformer, comprising a current transformer body (1), characterized in that: A terminal block (2) is provided on the top of the current transformer body (1). A junction box (4) is provided on the side of the current transformer body (1). A receiving groove (41) is provided on the side of the junction box (4) away from the current transformer body (1). An insulating partition (5) is provided inside the receiving groove (41). The partition (5) divides the receiving groove (41) from top to bottom into a sealed cavity (411) and a working cavity (412). An inlet hole (42) communicating with the working cavity (412) is provided at the bottom of the junction box (4). A sealing groove (41) is provided on the side of the junction box (4) away from the current transformer body (1). The cover plate (8) is sealed to the opening of the receiving groove (41) so that the sealing cavity (411) is isolated from the outside when the cover plate (8) is closed. The transformer body (1) is provided with a number of connecting rods (11) inserted into the sealing cavity (411). The partition plate (5) is provided with a number of conductive parts (6). One end of the conductive part (6) extending into the sealing cavity (411) is connected to the connecting rod (11) by a wire (7). One end of the conductive part (6) extending into the working cavity (412) is used to connect with the external cable inserted into the working cavity (412) through the inlet hole (42).

2. An outdoor combined current transformer according to claim 1, characterized in that: The partition (5) has a threaded hole (51) that connects the sealing cavity (411) and the working cavity (412). The conductive component (6) includes a conductive post (62) that is threaded into the threaded hole (51) and passes through the partition (5) and a conductive cover (61) that is disposed above the partition (5). The conductive cover (61) has a fixing groove (611) for inserting the conductive post (62) on the side facing the partition (5). The upper end of the conductive post (62) abuts against the bottom wall of the fixing groove (611). The conductive cover (61) is externally threaded with a connecting nut (613). The conductive post (62) is sleeved with a conductive ring (63) located below the partition (5). A conductive block (64) is disposed below the conductive ring (63). A conductive rod (65) is disposed on the side of the conductive block (64). The conductive rod (65) is used for hanging the O-type terminal connected to the external cable and electrically connecting it to the external cable.

3. An outdoor combined current transformer according to claim 2, characterized in that: The bottom wall of the fixing groove (611) is provided with a groove (612), and a conductive spring (625) in a compressed state is provided in the groove (612). One end of the conductive spring (625) abuts against the bottom wall of the groove (612), and the other end of the conductive spring (625) abuts against the end of the conductive post (62).

4. An outdoor combined current transformer according to claim 3, characterized in that: The conductive block (64) is eccentrically positioned relative to the axis of the conductive post (62). The conductive rod (65) is located on the side of the conductive block (64) facing the conductive post (62) and directly below the conductive post (62). A first limiting groove (622) is provided on the lower end face of the conductive post (62). A limiting rod (624) for contacting the upper part of the conductive rod (65) is slidably disposed in the first limiting groove (622).

5. An outdoor combined current transformer according to claim 4, characterized in that: The conductive post (62) has a second limiting groove (621) on the side facing the conductive spring (625). The upper end of the first limiting groove (622) is connected to the bottom wall of the second limiting groove (621). A limiting block (623) is provided in the second limiting groove (621). The upper end of the limiting rod (624) is fixedly connected to the lower end face of the limiting block (623). The lower end of the conductive spring (625) abuts against the limiting block (623). When the limiting block (623) abuts against the bottom wall of the second limiting groove (621), the end of the limiting rod (624) away from the limiting block (623) extends out of the post.

6. An outdoor combined current transformer according to claim 4, characterized in that: The conductive rod (65) is fitted with a compression spring (651) and a pressure block (652). The compression spring (651) and the pressure block (652) are arranged sequentially along the axial direction of the conductive rod (65) between the conductive block (64) and the limiting rod (624). One end of the compression spring (651) abuts against the conductive block (64), and the other end of the compression spring (651) abuts against the pressure block (652). When the compression spring (651) is in its natural length state, the distance between the pressure block (652) and the limiting rod (624) along the axial direction of the conductive rod (65) is less than the dimension of the O-type terminal connected to the external cable along the axial direction of the conductive rod (65).

7. An outdoor combined current transformer according to claim 1, characterized in that: The cover plate (8) is vertically slidably mounted on the junction box (4). The cover plate (8) is provided with a locking mechanism (9) for locking the cover plate (8) in a predetermined vertical position. An operating groove (82) is provided on the side of the cover plate (8) facing the junction box (4). An operating hole (83) is provided on the bottom wall of the operating groove (82). The locking mechanism (9) includes an operating rod (94) passing through the operating hole (83), a locking disc (91) disposed in the operating groove (82), and a locking spring (92). One side of the operating lever (94) is connected to the locking disc (91), and the other end of the operating lever (94) extends through the operating hole (83) to the outside of the cover plate (8) and is connected to the operating disc (95). The locking spring (92) is in a compressed state. One end of the locking spring (92) abuts against the bottom wall of the operating groove (82), and the other end of the locking spring (92) abuts against the locking disc (91). The partition plate (5) has a locking groove (53) on the side facing the cover plate (8) for the locking disc (91) to be inserted.

8. An outdoor combined current transformer according to claim 7, characterized in that: An operating block (93) is provided on the outer circumferential surface of the locking disc (91). The partition plate (5) facing the cover plate (8) has a first sliding groove (531) located below the locking groove (53) and a second sliding groove (532) located on the horizontal side of the locking groove (53). Both the first sliding groove (531) and the second sliding groove (532) communicate with the locking groove (53). The inner circumferential surface of the locking groove (53) has a slide rail connecting the first sliding groove (531) and the second sliding groove (532). The operating block (93) can slide within the first sliding groove (531), the second sliding groove (532), and the slide rail. The cover plate (8) facing the partition plate (5) has a slot (89) aligned with the first sliding groove (531) and a slot (89) aligned with the second sliding groove (532). 2) Aligned first mounting groove (84), the first mounting groove (84) is connected to the operating groove (82), the first mounting groove (84) is provided with a first mounting block (841) and a mounting spring (842), one end of the mounting spring (842) is fixedly connected to the first mounting block (841), and the other end of the mounting spring (842) is fixedly connected to the bottom wall of the first mounting groove (84). The partition (5) has a slot (54) for the first mounting block (841) to be inserted on the side facing the cover plate (8). The slot (54) is connected to the second sliding groove (532). The slot (54) extends upward through the partition (5). When the mounting spring (842) is in its natural length state, the first mounting block (841) extends out of the cover plate (8).

9. An outdoor combined current transformer according to claim 8, characterized in that: The cover plate (8) has an installation cavity (87) located on the side of the first installation groove (84) away from the operating groove (82). The installation cavity (87) communicates with the first installation groove (84). The cover plate (8) has a second installation groove (88) located on the side of the partition (5) facing the partition (5), on the side of the installation cavity (87) away from the first installation groove (84). The second installation groove (88) is located below the partition (5) and communicates with the installation cavity (87). A second installation block (881) is slidably disposed in the second installation groove (88) and can slide along the second installation groove (88) and be selectively inserted into the working cavity (412). A horizontally arranged round rod (871) is disposed in the installation cavity (87). The outer sleeve is provided with a rotating rod (872) that can rotate around the round rod (871). The rotating rod (872) has a first sliding hole (8721) above the round rod (871) and a second sliding hole (8722) below the round rod (871). A first sliding rod (8723) connected to the first mounting block (841) is slidably disposed in the first sliding hole (8721). A second sliding rod (8724) connected to the second mounting block (881) is slidably disposed in the second sliding hole (8722). A check piece (86) is provided on the cover plate (8) to restrict the movement of the first mounting block (841). When the mounting spring (842) is in its natural length state, the second mounting block (881) does not extend out of the cover plate (8).

10. An outdoor combined current transformer according to claim 9, characterized in that: The upper inner wall of the first mounting groove (84) is provided with a slot (89), and a check rod (861) is provided in the slot (89). The upper end face of the first mounting block (841) is provided with a check groove (8411) for inserting the check rod (861). The inner wall of the slot (89) away from the partition (5) is provided with a hole (891), and a push rod (863) that can slide along the axial direction of the hole (891) is inserted into the hole (891). The side of the check rod (861) facing the hole (891) is provided with a through-hole for inserting the push rod (863). The hole (8611) has an operating chamfer on one end of the check rod (861) facing the locking hole (891). The operating chamfer is located at the junction of the end face of the check rod (861) facing the locking hole (891) and the inner wall of the through hole (8611). The push rod (863) extends out of the cover plate (8) on the side away from the check rod (861). The push rod (863) is located on the path of the operating disc (95) moving towards the cover plate (8). When the check rod (861) is inserted into the check groove (8411), the operating chamfer is located on the moving path of the push rod (863).

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