Secondary outlet box for a mutual inductor

Abstract

The utility model relates to secondary outgoing line box sealing technical field for mutual inductor, especially secondary outgoing line box for mutual inductor, including the shell that front and back side surface all open settings, the shell front side open end cooperation setting has the apron, and the apron one side is hinged on the shell, the apron other side is connected the shell through the buckle, the apron inboard edge is provided with recess no. One, recess no. One is provided with sealing ring no. One, the front side edge of shell outer wall is provided with the boss, and the apron is set up recess no. Two on sealing ring no. One cooperation boss and shell front side, and recess no. Two sets up on sealing ring no. One side away from the apron, and the shell rear side open end is provided with sealing assembly. The connecting mode that apron adopts hinged and buckle combines, has simplified the operation, promoted work efficiency, avoided the problem that sealing property drops simultaneously caused by the frequent dismounting, the recess no. One cooperation sealing ring no. One of apron inboard, and recess no. Two that sets up on sealing ring no. One according to the boss and shell front side, has strengthened the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for secondary output boxes of current transformers, and in particular to a secondary output box for current transformers. Background Technology

[0002] In the field of instrument transformer manufacturing technology, the terminal box is a key component that ensures the safe and stable operation of the secondary wiring of the instrument transformer, and its performance is of paramount importance. Currently, most substation instrument transformer terminal boxes are manufactured using welding processes, with only a protective paint coating applied to the surface.

[0003] In terms of sealing, existing secondary outlet boxes typically use a single-layer sealing ring structure to prevent the intrusion of external factors such as rainwater and snowmelt, and are sealed and fixed by tightening bolts around the perimeter after wiring is completed.

[0004] However, with increasing usage time and the influence of complex and ever-changing on-site environments, the drawbacks of existing junction boxes have gradually become apparent. On the one hand, the simple single-layer sealing ring is prone to aging at the bolt fastening points during long-term use. The sealing performance of the aged sealing ring decreases significantly, allowing rainwater and other liquids to easily seep in, which in turn reduces the insulation level of the secondary wiring of the current transformer and may even threaten the normal and stable operation of the secondary system in severe cases. On the other hand, the sealing method of fastening bolts around the perimeter makes on-site inspection of secondary wiring operations extremely complex and cumbersome, not only affecting work efficiency, but also causing the junction box's sealing performance to gradually decrease due to frequent bolt disassembly and reassembly. Utility Model Content

[0005] In response to the current problems of poor sealing performance of sealing rings and cumbersome disassembly and assembly of bolt-fastened cover plates, which can easily affect sealing performance, this utility model provides a secondary output box for current transformers.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A secondary output box for a current transformer includes a housing with openings on both the front and rear sides. A cover plate is fitted to the front opening of the housing, with one side of the cover plate hinged to the housing. The other side of the cover plate is connected to the housing via a snap fastener. A groove is provided on the inner edge of the cover plate. A sealing ring is provided in the groove. A boss is provided on the front edge of the outer wall of the housing. A groove is provided on the sealing ring to fit the boss and the front side of the housing. The groove is located on the side of the sealing ring away from the cover plate. A sealing assembly is provided at the rear opening of the housing. The cover plate utilizes a combination of hinges and snap-fit ​​connections, simplifying operation and improving work efficiency while avoiding the problem of reduced sealing caused by frequent disassembly and assembly. The inner side groove of the cover plate, in conjunction with the sealing ring, and the second groove on the sealing ring targeting the boss and the front side of the housing, enhances the sealing performance, reduces the risk of rainwater and other liquids seeping in, ensures the insulation level of the secondary wiring of the transformer, and improves the operational stability of the secondary system. The sealing component located at the opening end on the rear side of the housing further strengthens the overall protection, optimizes the protection performance and maintainability of the terminal box, and also reserves structural space for the future addition of real-time monitoring function for electrical connection status.

[0008] Preferably, the thickness of the sealing ring is greater than the depth of the groove. This design, where the sealing ring is thicker than the groove, further enhances the sealing performance of the transformer secondary output box. When the cover plate is closed to the housing, the thicker sealing ring, under compression, can generate greater elastic deformation, effectively filling the tiny gaps between the cover plate and the housing. Compared to conventional fitting designs, this significantly improves the tightness of the seal. Simultaneously, this compression deformation allows the sealing ring to fit more tightly against the inner wall of the groove, the boss, and the front side of the housing, further optimizing the protective effect of the double-layer sealing structure. This effectively resists the intrusion of external liquids such as rainwater and snowmelt, reducing the risk of a decrease in the insulation level of the transformer secondary wiring and extending the stable operation cycle of the secondary system. Furthermore, this design allows the sealing ring to better compensate for thickness loss caused by aging and wear during long-term use, maintaining a good sealing condition, reducing maintenance frequency, and further improving the practicality and reliability of the output box.

[0009] Preferably, the sealing ring is either glued or bolted into the groove. Using either glue or bolts to fix the sealing ring in the groove significantly improves the performance and maintenance efficiency of the secondary output box of the instrument transformer. The glued method ensures a seamless fit between the sealing ring and the groove, effectively avoiding leakage risks caused by installation gaps, while simplifying the installation process and improving assembly efficiency. The bolted method, on the other hand, gives the sealing ring a detachable feature, allowing for quick removal and replacement when the sealing ring ages or is damaged. Both methods ensure the stability of the sealing ring in the groove, maintaining the integrity of the sealing structure even under conditions of equipment vibration and external impact, guaranteeing long-term reliable sealing of the output box, and providing strong support for the safe and stable operation of the instrument transformer secondary wiring system.

[0010] Preferably, a groove three is formed on the boss; a sealing ring two is disposed within the groove three; the thickness of the sealing ring two is greater than the depth of the groove three. The design of forming a groove three on the boss and providing a sealing ring two, with the sealing ring two being thicker than the groove three, further strengthens the sealing and protection system of the secondary output box of the instrument transformer. The sealing ring two and the sealing ring one form a double sealing barrier, effectively blocking the liquid penetration path through the staggered sealing structure. Compared to a single-layer seal or a single sealing ring design, it can more effectively resist the intrusion of rainwater, snowmelt, and moisture. The excessively thick sealing ring two generates stronger elastic deformation force after compression, which not only tightly fits the inner wall of the groove three but also provides additional pressure compensation at the connection between the housing and the cover plate, eliminating gaps caused by assembly errors or component deformation. Simultaneously, this redundant design ensures that the sealing ring two can maintain reliable sealing performance even with localized wear and aging during long-term use, reducing insulation problems in the secondary wiring of the instrument transformer caused by sealing failure, improving the safety and stability of power system operation, and reducing equipment maintenance frequency and costs.

[0011] Preferably, the sealing assembly includes a U-shaped plate fixedly disposed at the open end of the rear side of the housing; the U-shaped plate is provided with a plurality of threaded holes; the U-shaped plate is provided with a groove four; and a sealing ring three is disposed in the groove four. The sealing assembly adopts a U-shaped plate fixedly disposed at the open end of the rear side of the housing, and is provided with threaded holes, groove four, and sealing ring three. This design comprehensively improves the sealing and protection performance of the secondary output box of the current transformer. The U-shaped plate's structural design allows it to fit tightly against the rear opening of the housing, providing stable rear-end support for the entire outlet box and enhancing the overall structural strength of the housing. The threaded hole facilitates connection and fixation with external equipment or other components, making the outlet box installation more flexible. Furthermore, during tightening, it further compacts the sealing ring three, effectively preventing liquid seepage from the rear-end gap. The sealing ring three within the groove four forms a reliable sealing barrier between the U-shaped plate and external components, working in conjunction with the front sealing ring one and sealing ring two to achieve comprehensive sealing of the outlet box from front to back, eliminating the risk of rainwater and moisture intrusion. In addition, this sealing assembly has a simple structure, facilitating installation and disassembly. When the sealing ring three ages or is damaged, it can be quickly replaced, effectively reducing equipment maintenance difficulty and costs, and ensuring the long-term stable operation of the transformer secondary wiring system.

[0012] Preferably, the sealing assembly further includes a baffle plate fixedly disposed above the rear opening of the housing. The baffle plate, fixedly disposed above the rear opening of the housing in the sealing assembly, further optimizes the protective performance of the transformer secondary output box. This baffle plate effectively prevents rain, snow, sand, and other external foreign objects from directly intruding into the rear opening of the housing and the sealing assembly, reducing the risk of rainwater seeping into the output box through gaps and lowering the probability of the sealing ring and the U-shaped plate aging and being damaged due to long-term rainwater erosion. Simultaneously, the baffle plate prevents direct sunlight from hitting the sealing assembly, slowing down the aging rate of the sealing ring material caused by ultraviolet radiation and extending the service life of the sealing assembly.

[0013] Preferably, the thickness of sealing ring three is greater than the depth of groove four. This design, where the thickness of sealing ring three is greater than the depth of groove four, significantly improves the protective performance of the secondary output box sealing assembly of the current transformer. The thicker sealing ring three, under installation pressure, can generate greater elastic deformation, fully filling the tiny gaps between the U-shaped plate and external components. Compared to conventional fitting designs, this effectively blocks the penetration paths of rainwater and moisture. Even under extreme temperature differences and equipment vibration conditions, sealing ring three can maintain a tight fit due to its strong elastic recovery force, avoiding seal failure caused by thermal expansion and contraction or external impact.

[0014] Preferably, a through hole is provided on the bottom surface of the housing; a baffle is detachably installed on the bottom surface of the housing to match the through hole. The design of the through hole and the detachable baffle on the bottom surface of the housing greatly optimizes the performance of the secondary output box of the current transformer. The through hole provides a standardized channel for the introduction and exit of secondary wiring cables, facilitating the neat layout and centralized management of cables and avoiding the risk of poor contact or tangling caused by messy cables; the detachable baffle design facilitates the cable threading and wiring operations of personnel while sealing the through hole with a gland.

[0015] Preferably, the baffle includes a flat plate; a ring plate is provided on the flat plate to fit the through hole; the ring plate is snapped onto the bottom surface of the inner side of the housing. The design of the baffle using a flat plate and a ring plate with the ring plate snapped onto the bottom surface of the inner side of the housing significantly improves the reliability and ease of operation of the protection of the bottom surface of the secondary output box of the current transformer. The combined structure of the flat plate and the ring plate provides double-layer protection when sealing the through hole. The flat plate blocks the intrusion of large areas of foreign objects, while the ring plate tightly fits the edge of the through hole, further eliminating gaps. Compared with a single flat plate structure, this effectively enhances the sealing performance. The snap-on installation method significantly simplifies the installation process compared to traditional bolt fixing, allowing workers to quickly install and remove the baffle with one hand, greatly improving the efficiency of wiring and maintenance operations.

[0016] Preferably, the outer sides of the opposite surfaces of the ring plate are fitted with retaining strips that mate with the bottom surface of the inner side of the housing. These retaining strips secure the ring plate to the bottom surface of the inner side of the housing, facilitating the assembly and disassembly of the baffle.

[0017] As can be seen from the above technical solutions, the advantages of this utility model include: the secondary output box of the current transformer uses a hinged and snap-fit ​​connection method through the cover plate, which simplifies operation, improves work efficiency, and avoids the problem of reduced sealing caused by frequent disassembly and assembly; the groove on the inner side of the cover plate, in conjunction with the sealing ring, and the groove on the sealing ring targeting the boss and the front side of the housing, enhances the sealing performance, reduces the risk of rainwater and other liquids seeping in, ensures the insulation level of the secondary wiring of the current transformer, and improves the operational stability of the secondary system; the sealing component set at the opening end on the rear side of the housing further strengthens the overall protection, optimizes the protection performance and maintainability of the output box, and also reserves structural space for the subsequent addition of real-time monitoring function of electrical connection status. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the buckle structure of this utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0023] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention after the buckles have been removed. Figure 1 ;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the present invention after the buckles have been removed. Figure 2 ;

[0026] Figure 8 This is a schematic diagram of the structure of the baffle of this utility model;

[0027] Figure 9 This is a schematic diagram of the structure of the sealing ring of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 1-shell, 2-cover plate, 3-buckle, 4-sealing ring one, 5-sealing ring two, 6-sealing ring three, 7-shield, 8-baffle;

[0029] 101-Boss, 102-Groove Three, 103-U-shaped Plate, 104-Groove Four, 105-Through Hole, 106-Threaded Hole; 201-Groove One; 301-Hook, 302-Lock; 401-Groove Two; 801-Flat Plate, 802-Ring Plate, 803-Clamping Strip. Detailed Implementation

[0030] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0031] like Figure 1 , Figure 2 As shown, a secondary output box for a current transformer includes a housing 1 with openings on both the front and rear sides. A cover plate 2 is fitted onto the front opening of the housing 1, with one side of the cover plate 2 hinged to the housing 1. The other side of the cover plate 2 is connected to the housing 1 via a snap fastener 3. The snap fastener 3 includes a hook 301 fixedly mounted on one side of the cover plate 2, which can be hooked onto a latch 302, which is fixedly mounted on the housing 1. The connection method of the cover plate 2 using a combination of hinge and snap fastener 3 simplifies operation, improves work efficiency, and avoids the problem of reduced sealing caused by frequent disassembly and assembly.

[0032] like Figure 3 , Figure 4 , Figure 6 and Figure 9 As shown, a groove 201 is provided on the inner edge of the cover plate 2; a sealing ring 4 is provided in the groove 201; a boss 101 is provided on the front edge of the outer wall of the housing 1; a groove 401 is provided on the sealing ring 4 to mate with the boss 101 and the front side of the housing 1, and the groove 401 is located on the side of the sealing ring 4 away from the cover plate 2; a sealing assembly is provided at the rear opening of the housing 1. The thickness of the sealing ring 4 is greater than the depth of the groove 201. The sealing ring 4 is glued or bolted into the groove 201. A groove 102 is provided on the boss 101; a sealing ring 5 is provided in the groove 102; the thickness of the sealing ring 5 is greater than the depth of the groove 102.

[0033] The inner side groove 201 of the cover plate 2, in conjunction with the sealing ring 4, and the groove 401 on the sealing ring 4 targeting the boss 101 and the front side of the housing 1, enhances the sealing performance, reduces the risk of rainwater and other liquids seeping in, ensures the insulation level of the secondary wiring of the current transformer, and improves the operational stability of the secondary system. The sealing component set at the rear opening of the housing 1 further strengthens the overall protection, optimizes the protection performance and maintainability of the outlet box, and also reserves structural space for the future addition of real-time monitoring function of electrical connection status. The design of the sealing ring 4 being thicker than the depth of the groove 201 further enhances the sealing performance of the secondary outlet box of the current transformer. When the cover plate 2 is closed with the housing 1, the excessively thick sealing ring 4, under compression, can generate greater elastic deformation, effectively filling the tiny gaps between the cover plate 2 and the housing 1. Compared with conventional fitting designs, this significantly improves the tightness of the seal. Simultaneously, this compression deformation allows the sealing ring 4 to form a tighter fit with the inner wall of the groove 201, the boss 101, and the front side of the housing 1, further optimizing the protective effect of the double-layer sealing structure. This effectively resists the intrusion of external liquids such as rainwater and snowmelt, reduces the risk of a decrease in the insulation level of the secondary wiring of the instrument transformer, and extends the stable operation cycle of the secondary system. Furthermore, this design allows the sealing ring 4 to better compensate for thickness loss caused by aging and wear during long-term use, maintaining a good sealing condition, reducing maintenance frequency, and further improving the practicality and reliability of the outlet box. The sealing ring 4 is installed in the groove 201 by adhesive bonding or bolting, significantly improving the performance and maintenance efficiency of the instrument transformer secondary outlet box. The adhesive bonding method achieves a seamless fit between the sealing ring and the groove 201, effectively avoiding the risk of leakage caused by installation gaps, while simplifying the installation process and improving assembly efficiency. The bolt fixing method, on the other hand, gives the sealing ring a detachable feature, allowing for quick removal and replacement when the sealing ring ages or is damaged. Both methods ensure the stability of the sealing ring within the groove 201, maintaining the integrity of the sealing structure even under conditions of equipment vibration and external impact, guaranteeing the long-term reliable sealing of the terminal box, and providing strong protection for the safe and stable operation of the transformer secondary wiring system. A groove 102 is formed on the boss 101, and a second sealing ring 5 is installed thereon. The thickness of the second sealing ring 5 is greater than the depth of the groove 102. This design further strengthens the sealing protection system of the transformer secondary terminal box.The sealing ring 25 and sealing ring 14 form a double sealing barrier, effectively blocking the liquid penetration path through the staggered sealing structure. Compared with single-layer sealing or single sealing ring design, it can more effectively resist the intrusion of rainwater, snow water and moisture. The thicker sealing ring 25 generates stronger elastic deformation force after compression, which can not only fit tightly against the inner wall of groove 3102, but also form additional pressure compensation at the connection between housing 1 and cover plate 2, eliminating gaps caused by assembly errors or component deformation. At the same time, this redundant design allows sealing ring 25 to maintain reliable sealing performance even if local wear and aging occur during long-term use, reducing the insulation problems of secondary wiring of the current transformer caused by sealing failure, improving the safety and stability of power system operation, and reducing equipment maintenance frequency and cost.

[0034] like Figure 3 , Figure 5 and Figure 7 As shown, the sealing assembly includes a U-shaped plate 103 fixedly disposed at the rear opening end of the housing 1; the U-shaped plate 103 is provided with a plurality of threaded holes 106; the U-shaped plate 103 is provided with a groove 104; a sealing ring 6 is disposed in the groove 104. The sealing assembly also includes a baffle plate 7 fixedly disposed above the rear opening end of the housing 1. The thickness of the sealing ring 6 is greater than the depth of the groove 104.

[0035] The sealing assembly adopts a U-shaped plate 103 fixedly installed at the rear opening end of the housing 1, and has a threaded hole 106, a groove 104 and a sealing ring 6 on it. This design comprehensively improves the sealing and protection performance of the secondary output box of the current transformer. The U-shaped plate 103's structural design allows it to fit tightly against the rear opening of the housing 1, providing stable rear-end support for the entire outlet box and enhancing the overall structural strength of the housing 1. The threaded hole 106 facilitates connection and fixation with external equipment or other components, making the outlet box installation more flexible. During tightening, it further compacts the sealing ring 6, effectively preventing liquid seepage from the rear gap. The sealing ring 6 within the groove 104 forms a reliable sealing barrier between the U-shaped plate 103 and external components, working in conjunction with the front sealing rings 4 and 5 to achieve all-around sealing of the outlet box, eliminating the risk of rainwater and moisture intrusion. Furthermore, this sealing assembly has a simple structure, facilitating installation and disassembly. When the sealing ring 6 ages or is damaged, it can be quickly replaced, effectively reducing equipment maintenance difficulty and cost, and ensuring long-term stable operation of the transformer secondary wiring system. The baffle 7, fixedly installed above the rear opening of the housing 1 in the sealing assembly, further optimizes the protective performance of the transformer secondary outlet box. The shield 7 effectively prevents rain, snow, dust, and other external debris from directly impacting the rear opening of the housing 1 and the sealing components, reducing the risk of rainwater seeping into the junction box through gaps and lowering the likelihood of aging and damage to the sealing ring 6 and the U-shaped plate 103 due to long-term rainwater erosion. Simultaneously, the shield 7 prevents direct sunlight from reaching the sealing components, slowing down the aging of the sealing ring material caused by ultraviolet radiation and extending the service life of the sealing components. The design of the sealing ring 6 being thicker than the groove 104 significantly improves the protective performance of the transformer secondary junction box sealing components. The thicker sealing ring 6, under installation pressure, can generate greater elastic deformation, fully filling the tiny gaps between the U-shaped plate 103 and external components. Compared to conventional fitting designs, this effectively blocks the penetration paths of rainwater and moisture. Even under extreme temperature differences and equipment vibration, the sealing ring 6 can maintain a tight fit due to its strong elastic recovery force, preventing sealing failure caused by thermal expansion and contraction or external impact.

[0036] like Figure 3 , Figure 6 and Figure 8As shown, a through hole 105 is provided on the bottom surface of the housing 1; a baffle 8 is detachably installed on the bottom surface of the housing 1 to match the through hole 105. The baffle 8 includes a flat plate 801; a ring plate 802 is provided on the flat plate 801 to match the through hole 105; the ring plate 802 is snapped onto the inner bottom surface of the housing 1. The outer sides of the opposite surfaces of the ring plate 802 are fitted with retaining strips 803 to match the inner bottom surface of the housing 1. The design of the through hole 105 on the bottom surface of the housing 1, along with the detachable baffle 8, greatly optimizes the performance of the secondary output box of the current transformer. The through hole 105 provides a standardized channel for the introduction and exit of secondary wiring cables, facilitating the neat layout and centralized management of cables, and avoiding the risk of poor contact or tangling caused by messy cables; the design of the detachable baffle 8, while facilitating cable threading and wiring operations, also seals the through hole 105 using a gland. The baffle 8 employs a design combining a flat plate 801 and a ring plate 802, with the ring plate 802's clip 3 positioned on the inner bottom surface of the housing 1. This significantly improves the reliability and ease of operation of the protection for the bottom surface of the secondary output box of the current transformer. The combined structure of the flat plate 801 and the ring plate 802 provides double-layer protection when sealing the through hole 105. The flat plate 801 prevents large-area foreign object intrusion, while the ring plate 802 tightly fits the edge of the through hole 105, further eliminating gaps. Compared to a single flat plate 801 structure, this effectively enhances sealing performance. The clip 3 installation method, compared to traditional bolt fixing, significantly simplifies the installation process, allowing workers to quickly install and remove the baffle 8 with one hand, greatly improving wiring and maintenance efficiency. The clip 3 on the inner bottom surface of the housing 1 facilitates the installation and removal of the baffle 8.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A secondary output box for a current transformer, comprising a housing (1) with openings on both the front and rear sides, wherein a cover plate (2) is fitted to the front opening end of the housing (1), characterized in that, One side of the cover plate (2) is hinged to the housing (1); the other side of the cover plate (2) is connected to the housing (1) by a buckle (3); a groove (201) is provided on the inner side edge of the cover plate (2); a sealing ring (4) is provided in the groove (201); a boss (101) is provided on the front side edge of the outer wall of the housing (1); a groove (401) is provided on the sealing ring (4) to cooperate with the boss (101) and the front side of the housing (1), and the groove (401) is provided on the sealing ring (4) on the side away from the cover plate (2); a sealing component is provided at the rear opening end of the housing (1).

2. The secondary output box for the current transformer according to claim 1, characterized in that, The thickness of sealing ring 1 (4) is greater than the depth of groove 1 (201).

3. The secondary output box for the current transformer according to claim 2, characterized in that, The sealing ring 1 (4) is glued or bolted into the groove 1 (201).

4. The secondary output box for the current transformer according to claim 3, characterized in that, The boss (101) has a groove three (102); a sealing ring two (5) is provided in the groove three (102); the thickness of the sealing ring two (5) is greater than the depth of the groove three (102).

5. The secondary output box for a current transformer according to claim 1 or 4, characterized in that, The sealing assembly includes a U-shaped plate (103) fixedly disposed at the rear opening end of the housing (1); the U-shaped plate (103) is provided with a plurality of threaded holes (106); the U-shaped plate (103) is provided with a groove four (104); and a sealing ring three (6) is provided in the groove four (104).

6. The secondary output box for a current transformer according to claim 5, characterized in that, The sealing assembly also includes a baffle (7) fixedly disposed above the rear opening end of the housing (1).

7. The secondary output box for a current transformer according to claim 6, characterized in that, The thickness of sealing ring three (6) is greater than the depth of groove four (104).

8. The secondary output box for a current transformer according to claim 7, characterized in that, A through hole (105) is provided on the bottom surface of the housing (1); a baffle (8) is detachably provided on the bottom surface of the housing (1) in conjunction with the through hole (105).

9. The secondary output box for a current transformer according to claim 8, characterized in that, The baffle (8) includes a flat plate (801); a ring plate (802) is provided on the flat plate (801) in conjunction with the through hole (105); the ring plate (802) is snapped onto the bottom surface of the inner side of the housing (1).

10. The secondary output box for a current transformer according to claim 9, characterized in that, The outer sides of the opposite surfaces of the ring plate (802) are fitted with retaining strips (803) on the inner bottom surface of the shell (1).

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