Current transformer
By using hollow insulators composed of explosion-proof expanders and epoxy fiberglass tube porcelain umbrella skirt covers in the current transformer, combined with stainless steel corrugated discs and explosion-proof plates, the explosion problem of the current transformer in the event of failure is solved, safe use in earthquake relief and disaster relief is achieved, and equipment and personal safety is improved.
Patent Information
- Application Number
- CN202421730279.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Existing current transformers are prone to explosion when internal failures are made, endangering the safety of surrounding equipment and personal safety, and cannot meet the safety requirements in earthquake relief and disaster relief.
The hollow insulator consisting of explosion-proof expander, epoxy fiberglass tube and porcelain umbrella skirt cover is combined with stainless steel corrugated disc and explosion-proof plate. Through sealed connection and oil-balance mechanism, the current transformer is prevented from exploded, and the internal pressure is transferred to the explosion-proof plate explosion, avoiding the overall explosion.
The impact, explosion and stain-resistant performance of the current transformer is improved, ensuring that overall explosion is avoided in the event of failure, protecting equipment and personal safety, and meeting the safety requirements of earthquake relief.
Smart Images
Figure CN223273093U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of high-voltage current transformers, in particular to a current transformer. Background Art
[0002] During the movement of the earth's crust, natural disasters such as earthquakes often occur. In order to ensure the power supply during earthquake relief and meet the safety requirements of not collapsing in major earthquakes or being damaged in minor earthquakes, the mechanical strength of power equipment needs to be improved to meet the requirements of level nine earthquake resistance.
[0003] When a fault occurs inside the current transformer, the internal pressure of the current transformer increases to a level that exceeds its own tolerance, causing the current transformer to explode. The explosion of the current transformer will endanger surrounding equipment and personal safety. In order to meet the protection requirements for internal arc faults, it is necessary to develop an explosion-proof current transformer. Utility Model Content
[0004] The technical problem to be solved by the present invention is to provide a current transformer to solve the above problems.
[0005] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a current transformer, comprising: an explosion-proof expander, an oil tank, a hollow insulator, a base, a secondary lead tube and a secondary outlet box; the explosion-proof expander and the hollow insulator are installed at the top and bottom ends of the oil tank in a one-to-one correspondence, the hollow insulator is installed at the top end of the base, the secondary outlet box is installed on the base, the secondary lead tube passes through the hollow insulator and is connected to the secondary outlet box; the hollow insulator is composed of an epoxy glass fiber tube, a porcelain umbrella skirt sleeve and two insulator flanges, the porcelain umbrella skirt sleeve is sleeved on the epoxy glass fiber tube, the two insulator flanges are sealed and arranged at the top and bottom ends of the epoxy glass fiber tube and the porcelain umbrella skirt sleeve in a one-to-one correspondence, and the secondary lead tube is arranged in the epoxy glass fiber tube.
[0006] The beneficial effects of the utility model are as follows: the interior of the hollow insulator is provided with an epoxy glass fiber tube, which is beneficial to improving the impact resistance, explosion resistance, and pollution flashover resistance of the current transformer; the exterior is provided with a porcelain umbrella skirt sleeve, which is beneficial to improving the ultraviolet resistance, wind and sand resistance, acid rain resistance, and aging resistance of the current transformer; at the same time, the explosion-proof expander is beneficial to avoiding the problem of endangering surrounding equipment and personal safety caused by the explosion of the current transformer when a fault occurs inside the current transformer and the internal pressure of the current transformer increases to a level that exceeds its own bearing capacity.
[0007] On the basis of the above technical solution, the present invention can also be improved as follows.
[0008] Furthermore, the epoxy glass fiber tube and the porcelain shed are sealed and connected by an adhesive.
[0009] The beneficial effect of adopting the above further solution is that it is conducive to making the hollow insulator have excellent characteristics of anti-ultraviolet radiation, resistance to wind and sand, resistance to impact, explosion-proof, resistance to acid rain, and good anti-aging performance.
[0010] Furthermore, the oil tank includes: an oil tank shell, two mounting flanges, a conductive tube, two wiring terminals and a winding insulation wrap; the winding insulation wrap is arranged inside the oil tank shell, the two mounting flanges are arranged one-to-one on the side walls at both ends of the oil tank shell, the conductive tube passes through the oil tank shell, the mounting flanges and the winding insulation wrap, and the two wiring terminals are installed one-to-one at both ends of the conductive tube.
[0011] The beneficial effect of adopting the above further solution is that the oil cabinet, as an essential component of the current transformer, is conducive to injecting the oil injected from the explosion-proof expander into the hollow insulator during the assembly process and connecting the external circuit using the terminal.
[0012] Furthermore, the oil tank housing is sealed and mounted on the insulator flange provided on the top of the epoxy glass fiber tube and the porcelain shed.
[0013] The beneficial effect of adopting the above further solution is that the oil cabinet housing is sealed with the insulator flange, which helps to prevent leakage of oil inside the current transformer, thereby ensuring pressure balance when the current transformer is working normally.
[0014] Furthermore, a secondary winding is provided in the insulating winding package of the winding, and the conductive tube passes through the secondary winding.
[0015] The beneficial effect of adopting the above further solution is that it is conducive to forming a winding coil on the outer peripheral surface of the conductive tube, thereby ensuring the normal operation of the current transformer.
[0016] Furthermore, the base is sealed and connected to the insulator flange provided at the bottom ends of the epoxy glass fiber tube and the porcelain shed.
[0017] The beneficial effect of adopting the above further solution is that the base is sealed with the insulator flange, which helps to prevent leakage of oil inside the current transformer, thereby ensuring pressure balance when the current transformer is working normally.
[0018] Further, the explosion-proof expander includes: an oil filling valve, a limit plate, multiple external limit rods, an oil pipe, a stainless steel corrugated disk, multiple internal limit rods, an explosion-proof disk, a bottom plate and an expander shell; multiple external limit rods are arranged around the stainless steel corrugated disk, the top and bottom ends of the external limit rods are connected to the limit plate and the bottom plate in a one-to-one manner, the stainless steel corrugated disk can be arranged between the limit plate and the bottom plate for upward and downward displacement, the explosion-proof disk is arranged at the top of the stainless steel corrugated disk, the oil pipe is arranged on the bottom plate and connected to the bottom end of the stainless steel corrugated disk, the internal limit rod is arranged inside the stainless steel corrugated disk and installed on the bottom plate, the oil filling valve is arranged on the explosion-proof disk, the expander shell cover is arranged on the bottom plate, and the oil filling valve, the limit plate, the external limit rod, the oil pipe, the stainless steel corrugated disk, the internal limit rod and the explosion-proof disk are all arranged in the expander shell.
[0019] The beneficial effects of adopting the above-mentioned further scheme are as follows: the oil filling valve is conducive to sucking out the gas inside the current transformer and injecting oil at the same time during the assembly process; the limit plate, the internal limit rod and the external limit rod are conducive to limiting the displacement of the stainless steel corrugated disk; the oil pipe is conducive to inputting the oil injected from the oil filling valve into the oil tank and the hollow insulator below the explosion-proof expander; the stainless steel corrugated disk is conducive to balancing the internal oil pressure and the external air pressure when the current transformer is working normally by expanding up and down; the explosion-proof plate is conducive to exploding when the internal pressure of the current transformer is too high, thereby transferring the explosion of the entire current transformer to the explosion of the explosion-proof plate, avoiding the problem of endangering surrounding equipment and personal safety caused by the explosion of the current transformer.
[0020] Furthermore, the bottom plate is provided with through holes for gas and oil to pass through, and the bottom plate is sealed and mounted on the top of the oil tank shell.
[0021] The beneficial effect of adopting the above further scheme is that: setting a through hole on the bottom plate is conducive to inputting the oil injected from the oil filling valve into the oil tank and hollow insulator below the explosion-proof expander through the oil pipe, and the sealed connection between the bottom plate and the oil tank shell is conducive to ensuring the balance of the oil pressure inside the current transformer and the external air pressure.
[0022] Furthermore, a through hole is provided in the limiting plate, and the through hole is a through hole. When the stainless steel corrugated disk moves up and down, the explosion-proof plate and the oil filling valve pass through the through hole.
[0023] The beneficial effect of adopting the above further solution is that when the stainless steel corrugated disc expands and displaces upward and downward, the bursting disc and the oil filling valve pass through the through hole, which helps to avoid damage to the oil filling valve or the bursting disc due to the expansion of the stainless steel corrugated disc. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1A schematic diagram of the overall structure provided for an embodiment of the present utility model;
[0025] Figure 2 A cross-sectional view of an explosion-proof expander provided in an embodiment of the present utility model;
[0026] Figure 3 A cross-sectional view of an oil tank provided in an embodiment of the present utility model;
[0027] Figure 4 A half-side cross-sectional view of a hollow insulator provided in an embodiment of the present utility model.
[0028] in, Figure 1 The explosion-proof expander 1 and the oil tank 2 are in a half-section view.
[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:
[0030] 1. Explosion-proof expander; 2. Oil tank; 3. Hollow insulator; 4. Base; 5. Secondary lead tube; 6. Secondary outlet box; 11. Oil filling valve; 12. Limit plate; 13. External limit rod; 14. Oil pipe; 15. Stainless steel corrugated disk; 16. Internal limit rod; 17. Explosion-proof disk; 18. Bottom plate; 19. Expander housing; 21. Oil tank housing; 22. Mounting flange; 23. Conductive tube; 24. Terminal block; 25. Winding insulation wrap; 31. Epoxy fiberglass tube; 32. Porcelain umbrella skirt; 33. Insulator flange; 121. Through hole. DETAILED DESCRIPTION
[0031] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0032] like Figures 1 to 4 As shown, a current transformer includes: an explosion-proof expander 1, an oil tank 2, a hollow insulator 3, a base 4, a secondary lead tube 5 and a secondary outlet box 6; the explosion-proof expander 1 and the hollow insulator 3 are installed at the top and bottom ends of the oil tank 2 in a one-to-one correspondence, the hollow insulator 3 is installed at the top of the base 4, the secondary outlet box 6 is installed on the base 4, the secondary lead tube 5 passes through the hollow insulator 3 and is connected to the secondary outlet box 6; the hollow insulator 3 is composed of an epoxy glass fiber tube 31, a porcelain umbrella skirt sleeve 32 and two insulator flanges 33, the porcelain umbrella skirt sleeve 32 is sleeved on the epoxy glass fiber tube 31, the two insulator flanges 33 are sealed and arranged at the top and bottom ends of the epoxy glass fiber tube 31 and the porcelain umbrella skirt sleeve 32 in a one-to-one correspondence, and the secondary lead tube 5 is arranged in the epoxy glass fiber tube 31.
[0033] The beneficial effects of the utility model are as follows: the interior of the hollow insulator is provided with an epoxy glass fiber tube, which is beneficial to improving the impact resistance, explosion resistance, and pollution flashover resistance of the current transformer; the exterior is provided with a porcelain umbrella skirt sleeve, which is beneficial to improving the ultraviolet resistance, wind and sand resistance, acid rain resistance, and aging resistance of the current transformer; at the same time, the explosion-proof expander is beneficial to avoiding the problem of endangering surrounding equipment and personal safety caused by the explosion of the current transformer when a fault occurs inside the current transformer and the internal pressure of the current transformer increases to a level that exceeds its own bearing capacity.
[0034] Preferably, the epoxy glass fiber tube 31 and the porcelain shed sleeve 32 are sealed and connected by an adhesive.
[0035] The beneficial effect of adopting the above preferred solution is that it is conducive to making the hollow insulator have excellent characteristics of anti-ultraviolet radiation, wind and sand resistance, impact resistance, explosion resistance, acid rain resistance and good anti-aging performance.
[0036] Preferably, Figure 3 As shown, the oil cabinet 2 includes: an oil cabinet housing 21, two mounting flanges 22, a conductive tube 23, two wiring terminals 24 and a winding insulation wrap 25; the winding insulation wrap 25 is arranged inside the oil cabinet housing 21, and the two mounting flanges 22 are arranged one-to-one on the side walls at both ends of the oil cabinet housing 21. The conductive tube 23 passes through the oil cabinet housing 21, the mounting flanges 22 and the winding insulation wrap 25, and the two wiring terminals 24 are installed one-to-one at both ends of the conductive tube 23.
[0037] The beneficial effect of adopting the above preferred solution is that the oil cabinet, as an essential component of the current transformer, is conducive to injecting the oil injected from the explosion-proof expander into the hollow insulator during the assembly process and connecting the external circuit using the terminal.
[0038] Preferably, Figure 1 As shown, the oil tank housing 21 is sealed and mounted on the insulator flange 33 provided on the top of the epoxy glass fiber tube 31 and the porcelain shed 32 .
[0039] The beneficial effect of adopting the above preferred solution is that the oil cabinet housing is sealed with the insulator flange, which helps to prevent leakage of oil inside the current transformer, thereby ensuring pressure balance when the current transformer is working normally.
[0040] Preferably, Figure 3 As shown, a secondary winding is provided in the winding insulation wrap 25 , and the conductive tube 23 passes through the secondary winding.
[0041] The beneficial effect of adopting the above preferred solution is that it is conducive to forming a winding coil on the outer peripheral surface of the conductive tube, thereby ensuring the normal operation of the current transformer.
[0042] Preferably, Figure 1 As shown, the base 4 is sealedly connected to the insulator flange 33 arranged at the bottom ends of the epoxy glass fiber tube 31 and the porcelain shed 32.
[0043] The beneficial effect of adopting the above preferred solution is that the base is sealed with the insulator flange, which helps to prevent leakage of oil inside the current transformer, thereby ensuring pressure balance when the current transformer is working normally.
[0044] Preferably, Figure 1 and Figure 2 As shown, the explosion-proof expander 1 includes: an oil filling valve 11, a limit plate 12, a plurality of external limit rods 13, an oil pipe 14, a stainless steel corrugated disk 15, a plurality of internal limit rods 16, an explosion-proof disk 17, a bottom plate 18 and an expander shell 19; a plurality of the external limit rods 13 are arranged around the stainless steel corrugated disk 15, and the top and bottom ends of the external limit rods 13 are connected to the limit plate 12 and the bottom plate 18 in a one-to-one correspondence. The stainless steel corrugated disk 15 can be displaced up and down between the limit plate 12 and the bottom plate 18, and the explosion-proof disk 17 is arranged on the stainless steel corrugated disk 15. At the top of the corrugated disc 15, the oil pipe 14 is arranged on the bottom plate 18 and is connected to the bottom end of the stainless steel corrugated disc 15. The inner limit rod 16 is arranged inside the stainless steel corrugated disc 15 and is installed on the bottom plate 18. The oil filling valve 11 is arranged on the explosion-proof disc 17. The expander housing 19 is covered on the bottom plate 18. The oil filling valve 11, the limit plate 12, the outer limit rod 13, the oil pipe 14, the stainless steel corrugated disc 15, the inner limit rod 16 and the explosion-proof disc 17 are all arranged in the expander housing 19.
[0045] Among them, it should be noted that: in the preferred embodiment of the present utility model, the bottom end of the inner limit rod 16 is installed on an annular plate structure on the base plate 18. This annular plate structure is arranged in the through hole in the middle of the base plate 18 and is connected to the inner wall of the through hole in the middle of the base plate 18 through a connecting rod, thereby providing support for the installation of the inner limit rod 16.
[0046] The beneficial effects of adopting the above-mentioned preferred scheme are: the oil filling valve is conducive to sucking out the gas inside the current transformer and injecting oil at the same time during the assembly process; the limit plate, internal limit rod and external limit rod are conducive to limiting the displacement of the stainless steel corrugated disk; the oil pipe is conducive to inputting the oil injected from the oil filling valve into the oil tank and hollow insulator below the explosion-proof expander; the stainless steel corrugated disk is conducive to balancing the internal oil pressure and external air pressure when the current transformer is working normally through up and down expansion; the explosion-proof plate is conducive to exploding when the internal pressure of the current transformer is too high, thereby transferring the explosion of the entire current transformer to the explosion of the explosion-proof plate, avoiding the problem of endangering surrounding equipment and personal safety caused by the explosion of the current transformer.
[0047] Preferably, Figure 1 and Figure 2 As shown, the bottom plate 18 is provided with through holes for gas and oil to pass through, and the bottom plate 18 is sealed and installed on the top of the oil tank shell 21.
[0048] The beneficial effects of adopting the above-mentioned preferred scheme are: setting a through hole on the bottom plate is conducive to inputting the oil injected from the oil filling valve into the oil tank and hollow insulator below the explosion-proof expander through the oil pipe, and the sealed connection between the bottom plate and the oil tank shell is conducive to ensuring the balance of the oil pressure inside the current transformer and the external air pressure.
[0049] Preferably, Figure 2 As shown, a through hole 121 is provided in the limiting plate 12 . The through hole 121 is a through hole. When the stainless steel corrugated disk 15 moves up and down, the explosion-proof disk 17 and the oil filling valve 11 pass through the through hole 121 .
[0050] The beneficial effect of adopting the above preferred solution is that when the stainless steel corrugated disk expands and displaces up and down, the explosion-proof disk and the oil filling valve pass through the through hole, which helps to avoid damage to the oil filling valve or the explosion-proof disk due to the expansion of the stainless steel corrugated disk.
[0051] The explosion-proof principle of the present invention is described below through an embodiment:
[0052] like Figures 1 to 4 As shown, the oil filling valve 11 can extract the gas inside the current transformer and inject oil into the current transformer during the assembly process of the current transformer, so that the stainless steel corrugated disk 15 can balance the oil pressure inside the current transformer and the external air pressure by freely expanding and contracting under normal operation;
[0053] When the current transformer encounters a fault, after the height of the stainless steel corrugated disk 15 reaches the maximum value, the outer limit rod 13 and the limit plate 12 limit its height from continuing to change. At this time, the pressure inside the current transformer continues to increase. When the pressure inside the current transformer reaches the limit pressure that the explosion-proof disk 17 can withstand, the explosion-proof disk 17 will explode, so that the pressure inside the current transformer is released from the explosion-proof disk 17, preventing the current transformer from exploding as a whole, reducing damage to the equipment around the current transformer and endangering personal safety.
[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0056] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0057] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction 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 example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.
[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A current transformer, characterized in that: include: An explosion-proof expander (1), an oil tank (2), a hollow insulator (3), a base (4), a secondary lead tube (5) and a secondary outlet box (6); the explosion-proof expander (1) and the hollow insulator (3) are mounted on the top and bottom ends of the oil tank (2) in a one-to-one correspondence; the hollow insulator (3) is mounted on the top end of the base (4); the secondary outlet box (6) is mounted on the base (4); the secondary lead tube (5) passes through the hollow insulator (3) and is connected to the secondary outlet box (6); The hollow insulator (3) is composed of an epoxy glass fiber tube (31), a porcelain umbrella skirt sleeve (32) and two insulator flanges (33); the porcelain umbrella skirt sleeve (32) is sleeved on the epoxy glass fiber tube (31); the two insulator flanges (33) are sealed and arranged at the top and bottom ends of the epoxy glass fiber tube (31) and the porcelain umbrella skirt sleeve (32) in a one-to-one correspondence; and the secondary lead tube (5) is arranged in the epoxy glass fiber tube (31); The explosion-proof expander (1) comprises: an oil filling valve (11), a limit plate (12), a plurality of external limit rods (13), an oil pipe (14), a stainless steel corrugated plate (15), a plurality of internal limit rods (16), an explosion-proof disk (17), a bottom plate (18) and an expander housing (19); A plurality of outer limiting rods (13) are arranged around the stainless steel corrugated disk (15), and the top and bottom ends of the outer limiting rods (13) are connected to the limiting plate (12) and the bottom plate (18) in a one-to-one correspondence. The stainless steel corrugated disk (15) is arranged between the limiting plate (12) and the bottom plate (18) so as to be displaceable up and down. The explosion-proof plate (17) is arranged at the top end of the stainless steel corrugated disk (15), and the oil pipe (14) is arranged on the bottom plate (18) and connected to the bottom end of the stainless steel corrugated disk (15). The inner limiting rod (16) is arranged inside the stainless steel corrugated disk (15) and installed on the bottom plate (18); the oil filling valve (11) is arranged on the explosion-proof disk (17); the expander housing (19) is covered on the bottom plate (18); the oil filling valve (11), the limiting plate (12), the outer limiting rod (13), the oil pipe (14), the stainless steel corrugated disk (15), the inner limiting rod (16) and the explosion-proof disk (17) are all arranged in the expander housing (19); A through hole (121) is provided in the limiting plate (12), and the through hole (121) is a through hole. When the stainless steel corrugated disk (15) moves up and down, the explosion-proof disk (17) and the oil filling valve (11) pass through the through hole (121).
2. A current transformer according to claim 1, characterized in that: The epoxy glass fiber tube (31) and the porcelain shed skirt (32) are sealed and connected via an adhesive.
3. A current transformer according to claim 1, characterized in that: The oil cabinet (2) comprises: an oil cabinet housing (21), two mounting flanges (22), a conductive tube (23), two wiring terminals (24) and a winding insulation wrap (25); the winding insulation wrap (25) is arranged inside the oil cabinet housing (21), the two mounting flanges (22) are arranged on the side walls at both ends of the oil cabinet housing (21) in a one-to-one correspondence, the conductive tube (23) passes through the oil cabinet housing (21), the mounting flanges (22) and the winding insulation wrap (25), and the two wiring terminals (24) are installed on the two ends of the conductive tube (23) in a one-to-one correspondence.
4. A current transformer according to claim 3, characterized in that: The oil tank housing (21) is sealed and mounted on the insulator flange (33) arranged on the top ends of the epoxy glass fiber tube (31) and the porcelain skirt sleeve (32).
5. A current transformer according to claim 3, characterized in that: A secondary winding is provided in the winding insulation package (25), and the conductive tube (23) passes through the secondary winding.
6. A current transformer according to claim 3, characterized in that: The base (4) is sealedly connected to the insulator flange (33) arranged at the bottom ends of the epoxy glass fiber tube (31) and the porcelain umbrella skirt sleeve (32).
7. A current transformer according to claim 3, characterized in that: The bottom plate (18) is provided with through holes for gas and oil to pass through, and the bottom plate (18) is sealed and installed on the top end of the oil tank shell (21).