Protective device for junction box and current transformer

Abstract

The invention discloses a protective device for a junction box and a current transformer, and belongs to the technical field of current transformers, the protective device comprises a waterproof cover, a telescopic assembly and a locking piece, the waterproof cover comprises an elastic cover face abutting against the upper end face of the junction box, the upper surface of the cover face comprises a downwards-sunken diversion trench, and the two ends of the telescopic assembly are connected with the two ends of the waterproof cover respectively; the length of the telescopic assembly is adjustable so as to adjust the width of the waterproof cover, and the locking piece is movably used for locking the telescopic assembly and abuts against the lower end face of the junction box. The waterproof cover is arranged on the junction box, rain and snow can be effectively shielded and can be quickly discharged along the diversion trench of the cover surface, accumulated water is prevented from permeating into the junction box, the service life of equipment is prolonged, and the width and height of a space defined by the waterproof cover and the telescopic assembly are adjusted by adjusting the length and position of the telescopic assembly. The waterproof cover is suitable for junction boxes of different sizes, the locking piece and the waterproof cover are fixed on the junction box in a matched mode, installation and detachment are convenient, and reliability and economical efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and particularly to a protection device for a junction box and a current transformer. Background Art

[0002] A current transformer is an important electrical device in the power system. Current transformers are generally used outdoors and have a long service life. The sealing cover of the secondary junction box of a current transformer that is exposed to the sun and rain and snow erosion outdoors for a long time is prone to corrosion and rust, and the sealing strip is prone to aging and deformation, resulting in a decrease in sealing performance. Rain and snow are likely to flow into the current transformer through the corroded part. If this continues for a long time, the insulation level of the secondary cable inside the current transformer will decrease, and even cause misoperation of protection, loss of load. The present invention proposes a new solution to the above problems. Summary of the Invention

[0003] In order to overcome at least one of the above disadvantages, the present invention provides a protection device for a junction box and a current transformer. The object of the present invention can be achieved by adopting the following technical solutions:

[0004] In a first aspect of the present application, there is provided a protection device for a junction box, including a protection device, the protection device is applied to a junction box, and the protection device includes:

[0005] A waterproof cover, the waterproof cover includes an elastic cover surface that abuts against the upper end surface of the junction box, and the upper surface of the cover surface includes a downwardly concave diversion groove;

[0006] A telescopic assembly, both ends of the telescopic assembly are respectively connected to both ends of the waterproof cover, and the length of the telescopic assembly is adjustable to adjust the width of the waterproof cover;

[0007] A locking member, the locking member is movable to lock the telescopic assembly and abuts against the lower end surface of the junction box.

[0008] In an implementable manner, the telescopic assembly includes a first connecting member and a second connecting member, the first connecting member is movably connected to the second connecting member, and the locking member is used to fix the positions of the first connecting member and the second connecting member.

[0009] In an implementable manner, at least a part of the first connecting member is located within the projection area of the edge of the second connecting member in the horizontal direction, and the locking member passes through the first connecting member and the second connecting member and can move in a direction close to the junction box until it abuts against the junction box.

[0010] In an implementable manner, the locking member includes a bolt. A plurality of first through holes are formed in the first connecting member, and a plurality of second through holes corresponding to the first through holes are formed in the second connecting member. Internal threads corresponding to the bolt are provided on the first through holes and / or the second through holes.

[0011] In an implementable manner, the first connecting member and the second connecting member include pipe fittings, and at least a part of the first connecting member is embedded in the second connecting member.

[0012] In an implementable manner, the first connecting member and the second connecting member include plate members, and at least a part of the first connecting member is located at the top or bottom of the second connecting member.

[0013] In an implementable manner, the cover includes a bending portion for abutting against the upper end surface of the junction box, and the degree of bending of the bending portion is adjusted by the telescopic assembly.

[0014] In an implementable manner, the cover is of a corrugated structure. The corrugated structure includes a wave crest and a wave trough arranged in sequence. The length direction of the wave crest and the wave trough is arranged along the axis direction of the bending portion, and the diversion groove is formed at the wave trough.

[0015] In an implementable manner, the projected area of the waterproof cover on the side away from the fuel tank exceeds the edge of the junction box by at least 50 mm.

[0016] In an implementable manner, one end of the waterproof cover extending downward away from the fuel tank forms a drip edge, and the inclination angle of the diversion groove is 5° to 20°.

[0017] In an implementable manner, the protection device further includes:

[0018] An installation part, both ends of the telescopic assembly are movably connected to the installation parts at both ends of the bottom of the waterproof cover respectively, and the radial distance between the telescopic assembly and the junction box is adjustable.

[0019] In the second aspect of the present application, a current transformer is provided, including:

[0020] A secondary junction box, the secondary junction box is arranged on the fuel tank;

[0021] And a protection device for a junction box in any one of the first aspects, the protection device for a junction box is used to cover the secondary junction box.

[0022] Advantageous Technical Effects of the Present Invention: According to the present disclosure, the protective device for the junction box and the current transformer include a waterproof cover, a telescopic assembly, and a locking member. By arranging the waterproof cover on the junction box, it can effectively block rain and snow and quickly drain the rain and snow along the diversion grooves on the cover surface, preventing water accumulation from penetrating into the junction box. The waterproof cover and the top of the junction box form a physical barrier, cooperating with the original sealing cover to constitute a double-layer protection system. Even if the sealing strip of the sealing cover ages and fails, most of the external water vapor can still be blocked, extending the service life of the equipment. By adjusting the length and position of the telescopic assembly, the width and height of the space enclosed by the waterproof cover and the telescopic assembly can be adjusted, and the size can be adaptively adjusted to be applicable to junction boxes of different sizes. The locking member is used to lock the telescopic assembly and cooperate with the waterproof cover to be fixed on the junction box, facilitating installation and disassembly without the need for professional tools, reducing the difficulty of on-site operations, and improving the reliability and economy of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, the following is given by way of example and not limitation:

[0024] Figure 1 Shows a schematic structural view of the current transformer of the present invention from one angle;

[0025] Figure 2 Shows a schematic structural view of the current transformer of the present invention from another angle;

[0026] Figure 3 Shows a schematic overall structural view of a conventional current transformer;

[0027] Figure 4 Shows a schematic structural view of the protective device for the junction box of the present invention from the first angle;

[0028] Figure 5 Shows a schematic structural view of the protective device for the junction box of the present invention from the second angle;

[0029] Figure 6 Shows a schematic structural view of the protective device for the junction box of the present invention from the third angle;

[0030] Figure 7 Shows a schematic structural view of the protective device for the junction box of the present invention from the fourth angle;

[0031] Figure 8 Shows a top view of the structure of the protective device for the junction box of the present invention;

[0032] Figure 9 Shows a side view of the structure of the protective device for the junction box of an embodiment of the present invention;

[0033] Figure 10 Shows a side view of the structure of the protective device for the junction box of another embodiment of the present invention;

[0034] Figure 11 Shows a side view of the protective device structure for a junction box according to another embodiment of the present invention.

[0035] In the figure:

[0036] 100, fuel tank; 200, secondary junction box; 1, protective device; 11, waterproof cover; 12, installation part; 13, telescopic assembly; 14, locking part;

[0037] 111, diversion groove; 121, installation hole; 131, first connecting piece; 132, second connecting piece; 1311, first through hole; 1321, second through hole. Detailed implementation manners

[0038] In the following detailed disclosure, reference is made to the accompanying drawings and these embodiments are fully described. To make the technical solutions of the present invention clearer and more definite for those skilled in the art, the described implementation manners are not limited thereto. The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings.

[0039] In the present invention, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "joined", "fixed" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be construed as a limitation to the present invention.

[0041] As Figure 3 shown, the secondary junction box 200 of the traditional current transformer is arranged on the side wall of the cylindrical fuel tank 100. The secondary junction box 200 can be a horizontal cylindrical box body, and a sealable cover that can be opened is provided at the opening of the box body. The seal between the seal cover and the opening is achieved through a sealing strip.

[0042] In the first aspect of the present application, as Figure 1 , Figure 2 , Figures 4 - 11As shown in the figure, a protective device for a junction box is provided, including a protective device 1, which is applied to the junction box. The protective device 1 includes a waterproof cover 11, a telescopic component 13, and a locking component 14. The waterproof cover 11 includes an elastic cover surface that abuts against the upper end surface of the junction box. The upper surface of the cover includes a downwardly concave diversion groove 111. Both ends of the telescopic component 13 are respectively connected to both ends of the waterproof cover 11, and the length of the telescopic component 13 is adjustable to adjust the width of the waterproof cover 11. The locking component 14 is movable to lock the telescopic component 13 and abuts against the lower end surface of the junction box.

[0043] For the protective device for the junction box provided in this embodiment, by arranging the waterproof cover 11 on the junction box, it can effectively block rain and snow and make the rain and snow quickly drain along the diversion groove 111 on the cover surface, greatly improving the drainage efficiency and effectively preventing water accumulation from penetrating into the junction box. The waterproof cover 11 forms a physical barrier with the top of the junction box, and together with the original sealing cover, it constitutes a double-layer protection system of "external protection and internal guarantee". Even if the sealing strip of the sealing cover ages and fails, it can still block more than 90% of the external water vapor, extending the service life of the equipment.

[0044] For the protective device for the junction box provided in this embodiment, by covering the waterproof cover 11 outside the junction box, it can also play a role in preventing ultraviolet rays and resisting impacts to a certain extent, greatly reducing the aging speed of the sealing strip. It can not only resist the impact of sand, wind, and gravel, but also withstand a snow load of at least 1.5 kN / m2, improving the environmental adaptability of the junction box and extending the service life of the equipment.

[0045] Among them, the waterproof cover 11 can be made of materials with corrosion resistance, aging resistance, and good waterproof performance, such as stainless steel, aluminum alloy, or special plastics, to ensure the stability of long-term use.

[0046] Among them, a hydrophobic coating can be provided on the waterproof cover 11, which can make water droplets form beads when contacting the surface of the coating and slide off the surface of the coating more easily, reducing the possibility of water penetration and further improving the waterproof effect.

[0047] For the protective device for the junction box provided in this embodiment, by adjusting the length and position of the telescopic component 13, the width and height of the space enclosed by the waterproof cover 11 and the telescopic component 13 can be adjusted, and the size can be adjusted adaptively, suitable for junction boxes of different sizes.

[0048] Among them, the length adjustment range of the telescopic component 13 is 200 mm - 350 mm, and the height adjustment range is 0 mm - 100 mm, that is, the width adjustment range of the enclosed space is 200 mm - 350 mm, and the height adjustment range of the enclosed space is 200 mm - 500 mm, which can be compatible with the secondary junction boxes 200 of most national grid standard current transformer models.

[0049] The protective device for the junction box provided in this embodiment. The locking member 14 is used to lock the telescopic assembly 13 and cooperate with the waterproof cover 11 to be fixed on the junction box, which is convenient for installation and disassembly, without the need for professional tools, reduces the difficulty of on-site operation, and improves the reliability and economy of the current transformer.

[0050] In an implementable manner, as Figures 4 - 8 shown, the telescopic assembly 13 includes a first connecting member 131 and a second connecting member 132. The first connecting member 131 is movably connected to the second connecting member 132, and the locking member 14 is used to fix the positions of the first connecting member 131 and the second connecting member 132.

[0051] Wherein, the first connecting member 131 and the second connecting member 132 are slidably matched along the length direction. The first connecting member 131 and the second connecting member 132 are dynamically locked by applying a pre-tightening force through the locking member 14. After loosening the locking member 14, the first connecting member 131 can be slid out along the second connecting member 132, which improves the efficiency of installation and disassembly.

[0052] Wherein, the sliding connection between the first connecting member 131 and the second connecting member 132 can adjust the overall length of the telescopic assembly 13. When the length of the telescopic assembly 13 changes, the bending degree of the waterproof cover 11 connected thereto will also be adjusted accordingly, so that the waterproof cover 11 can better fit junction boxes of different sizes, improving the applicability and flexibility and ensuring good sealing and protection effects.

[0053] In an implementable manner, as Figures 4 - 8 shown, at least part of the first connecting member 131 is located within the projection area of the edge of the second connecting member 132 in the horizontal direction. The locking member 14 passes through the first connecting member 131 and the second connecting member 132 and can move towards the junction box until it abuts against the junction box.

[0054] Wherein, in the horizontal direction, there is a projection overlapping area between the first connecting member 131 and the second connecting member 132, and the projection overlapping area is more than 30% of the first connecting member 131 or the second connecting member 132 itself, ensuring the balanced transmission of pressure.

[0055] Wherein, the locking member 14 can pass through the first connecting member 131 and the second connecting member 132 from the bottom upwards. The end of the locking member 14 abuts against the lower end face of the junction box and cooperates with the waterproof cover 11 to form a limit for the junction box, maintaining the stability of the protective device 1.

[0056] In an implementable manner, as Figure 4 and Figure 5As shown, the locking member 14 includes a bolt. A number of first through holes 1311 are provided on the first connecting member 131, and a number of second through holes 1321 corresponding to the first through holes 1311 are provided on the second connecting member 132. Internal threads corresponding to the bolt are provided on the first through holes 1311 and / or the second through holes 1321.

[0057] Among them, the first through holes 1311 and the second through holes 1321 can be arranged in an equidistant distribution manner. For example, the spacing is about 10 mm, which can ensure the positioning accuracy in cooperation with the bolt.

[0058] Among them, a number of through holes are provided on both the first connecting member 131 and the second connecting member 132, which can ensure that the bolt is installed at the position directly below the axis of the junction box during installation, thus ensuring the installation stability.

[0059] Among them, internal threads corresponding to the bolt are provided on the first through holes 1311 and / or the second through holes 1321 to achieve fixation with the bolt, and fixation can also be achieved through a nut.

[0060] In an implementable manner, the first connecting member 131 and the second connecting member 132 include plate members, and at least a part of the first connecting member 131 is located on the top or bottom of the second connecting member 132.

[0061] It can be understood that the first connecting member 131 and the second connecting member 132 adopt a design of stacking plate members up and down, which is suitable for the installation of a compact junction box with limited space, uses less materials, and has a lower cost.

[0062] In an implementable manner, the first connecting member 131 and the second connecting member 132 include pipe members, and at least a part of the first connecting member 131 is embedded in the second connecting member 132.

[0063] It can be understood that the first connecting member 131 and the second connecting member 132 adopt a design of nesting pipe members, which can improve the bending resistance capacity.

[0064] In an implementable manner, as Figure 1 and Figure 2 shown, the cover surface includes a bending portion for abutting against the upper end surface of the junction box. As Figures 4 - 7 shown, the bending degree of the bending portion is adjusted by the telescopic assembly 13.

[0065] Among them, the radian of the bending portion is adjusted by the telescopic assembly 13, which can be adapted to the upper end surfaces of junction boxes with different curvatures (such as flat surfaces, arc surfaces or inclined surfaces), eliminate the excessive gaps caused by the shape mismatch of the rigid cover body, and prevent water seepage, thus realizing dynamic fitting installation.

[0066] In one possible implementation, the cover is of a corrugated structure. The corrugated structure includes a wave crest and a wave trough arranged in sequence. The length direction of the wave crest and the wave trough is basically set along the axis direction of the bending part, and a diversion groove 111 is formed at the wave trough.

[0067] Among them, the corrugated cover has good elasticity and restorability, and can well disperse stress when bearing pressure, vibration and impact, maintaining high stability and durability.

[0068] Among them, the drain trough formed by the corrugated structure can greatly improve the drainage capacity, meet the demand for rapid drainage under rainstorm intensity. The corrugated inclination angle (i.e., the angle between the wave crest and the horizontal plane) forms a directional water flow scouring effect. Combined with the centrifugal drainage effect of the wave trough diversion groove 111, it can automatically remove surface sediments and maintain long-term drainage efficiency.

[0069] Among them, the wave crest and the wave trough extend along the axis of the bending part to form a drainage channel parallel to the axis of the junction box, which can accurately guide the water flow to the area on the side of the junction box far from the fuel tank 100, avoiding rainwater flowing through the junction box and reducing the risk of secondary penetration.

[0070] Among them, a semi-circular groove with a depth of 3 mm - 8 mm can be set at the bottom of the diversion groove 111. When icing occurs in winter, a directional expansion space can be formed, avoiding the destruction of the structure by ice expansion force, reducing the ice adhesion, and improving the tolerance to extreme climates.

[0071] Among them, the corrugated structure can be spliced and extended, and methods such as snap connection or welding can be used to meet the installation scenario requirements of multiple junction boxes in parallel or junction boxes of different sizes.

[0072] In one possible implementation, as Figure 1 shown, the projected area of the waterproof cover 11 on the side far from the fuel tank 100 exceeds the edge of the junction box by at least 50 mm.

[0073] Among them, the width adjustment range of the waterproof cover 11 is 200 mm - 400 mm, which can be compatible with the secondary junction boxes 200 of the vast majority of national grid standard current transformers.

[0074] Among them, the width of the waterproof cover 11 can be designed according to the size of the junction box. The projected area of the waterproof cover 11 on the side far from the fuel tank 100 exceeds the edge of the junction box by at least 50 mm, which can ensure shielding against wind and rain while not affecting the opening of the sealing cover.

[0075] In one possible implementation, as Figure 10 shown, one end of the waterproof cover 11 far from the fuel tank 100 extends downward to form a drip edge, and the inclination angle of the diversion groove 111 is 5° - 20°.

[0076] Among them, when the diversion groove 111 is inclined, the length directions of the wave crest and the wave trough are arranged at an angle with the axial direction of the bending part. The inclined diversion groove 111 causes the water flow to form a self-cleaning effect, reducing the risk of blockage of the diversion groove 111 caused by surface dirt adhesion.

[0077] Among them, the waterproof cover 11 extends beyond the edge of the junction box by at least 50 mm and extends downward to form a drip edge, which can resist a part of the oblique wind and rain and improve the protection effect.

[0078] In an implementable manner, as Figure 11 shown, the end face of the waterproof cover 11 in contact with the fuel tank 100 fits the fuel tank 100, reducing the gap between the waterproof cover 11 and the fuel tank 100 and reducing the rainwater passing through this gap.

[0079] Furthermore, an elastic sealing strip, such as made of rubber, is provided on the end face of the waterproof cover 11 in contact with the fuel tank 100, which can improve the fitting degree with the fuel tank 100, further improve the waterproof effect, and enable the accumulated water to drain from the side of the diversion groove 111 away from the fuel tank 100.

[0080] In an implementable manner, as Figures 4 - 7 shown, the protection device 1 further includes a mounting part 12. Both ends of the telescopic assembly 13 are movably connected to the mounting parts 12 at both ends of the bottom of the waterproof cover 11 respectively, and the radial distance between the telescopic assembly 13 and the junction box is adjustable.

[0081] Among them, by adjusting the positions of the telescopic assembly 13 and the mounting part 12, the radial distance between the telescopic assembly 13 and the junction box can be adjusted, and the adjustment range is 0 - 100 mm. It can compensate for the concentricity deviation of the installation base surface, ensure that the circumferential gap between the waterproof cover 11 and the junction box is uniform, and avoid water seepage caused by too large a gap.

[0082] Among them, the mounting part 12 can be a plate member extending downward from the bottom of the waterproof cover 11, which can improve the strength of the overall structure.

[0083] Among them, an array of mounting holes 121 can be longitudinally opened on the mounting part 12, and the telescopic assembly 13 and the mounting part 12 are detachably connected by bolts to realize the adjustment of the position of the telescopic assembly 13.

[0084] Among them, a longitudinal slide rail or chute can be provided on the mounting part 12 for the telescopic assembly 13 to slide, realizing stepless height adjustment, and it can be fixed by self-locking and anti-detachment, with higher positioning accuracy.

[0085] In the second aspect of the present application, as Figure 1 and Figure 2As shown, a current transformer is provided, which includes a secondary junction box 200 and any one of the protective devices for the junction box in the first aspect. The secondary junction box 200 is disposed on the oil tank 100, and the protective device for the junction box is used to cover the secondary junction box 200.

[0086] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0087] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0088] In view of the above detailed description, these and other changes can be made to these embodiments. This written description discloses the present invention including the best mode of the embodiments. The patent scope obtained by the present invention is defined by the claims, and the claims are not limited by the content of this disclosure. The protection scope of the present invention is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent replacements or changes, and all are within the protection scope of the present invention.

Claims

1. A protective device for a junction box, characterized in that: The invention comprises a protective device (1), wherein the protective device (1) is applied to a junction box, and the protective device (1) comprises: A waterproof cover (11), the waterproof cover (11) comprising an elastic cover surface abutting against the upper end surface of the junction box, the upper surface of the cover surface comprising a downwardly recessed guide groove (111); A telescopic component (13), two ends of the telescopic component (13) are respectively connected to two ends of the waterproof cover (11), and the length of the telescopic component (13) is adjustable to adjust the width of the waterproof cover (11); A locking member (14), the locking member (14) is movably used to lock the telescopic assembly (13) and abuts against the lower end surface of the junction box.

2. The protection device for a junction box according to claim 1, characterized in that: The telescopic assembly (13) comprises a first connecting member (131) and a second connecting member (132), wherein the first connecting member (131) is movably connected to the second connecting member (132), and the locking member (14) is used to fix the positions of the first connecting member (131) and the second connecting member (132).

3. The protection device for a junction box according to claim 2, characterized in that: At least a portion of the first connecting member (131) is located within the edge projection area of ​​the second connecting member (132) in the horizontal direction, and the locking member (14) is inserted through the first connecting member (131) and the second connecting member (132) and can move toward the junction box until it abuts against the junction box.

4. The protection device for a junction box according to claim 3, characterized in that: The locking member (14) comprises a bolt, the first connecting member (131) is provided with a plurality of first through holes (1311), the second connecting member (132) is provided with a plurality of second through holes (1321) corresponding to the first through holes (1311), and the first through holes (1311) and / or the second through holes (1321) are provided with internal threads corresponding to the bolts.

5. The protection device for a junction box according to claim 1, characterized in that: The cover surface comprises a curved portion for abutting against the upper end surface of the junction box, and the degree of curvature of the curved portion is adjusted by the telescopic assembly (13).

6. The protection device for a junction box according to claim 5, characterized in that: The cover surface is a corrugated structure, and the corrugated structure includes crests and troughs arranged in sequence. The length directions of the crests and troughs are arranged along the axial direction of the curved portion, and the guide groove (111) is formed at the trough.

7. The protection device for a junction box according to claim 1, characterized in that: The projection area of ​​the waterproof cover (11) on the side away from the oil tank (100) exceeds the edge of the junction box by at least 50 mm.

8. The protection device for a junction box according to claim 1 or 7, characterized in that: One end of the waterproof cover (11) away from the oil tank (100) extends downward to form a dripping eave, and the inclination angle of the guide groove (111) is 5° to 20°.

9. The protection device for a junction box according to claim 1, characterized in that: The protective device (1) further comprises: The mounting portion (12) has two ends of the telescopic component (13) movably connected to the mounting portion (12) at two ends of the bottom of the waterproof cover (11), and the radial distance between the telescopic component (13) and the junction box is adjustable.

10. A current transformer, characterized in that: include: A secondary junction box (200), wherein the secondary junction box (200) is arranged on the oil tank (100); And a junction box protection device according to any one of claims 1 to 9, wherein the junction box protection device is used to cover the secondary junction box (200).

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