External current transformer and GIS

Abstract

The utility model provides an external current transformer and a GIS, and belongs to the technical field of high-voltage switches. The external current transformer comprises a transformer cylinder, a flange plate and an outer protective cover, the outer protective cover comprises a cover body and a flange which is located at one axial end of the cover body and is folded inwards, the transformer cylinder comprises a limiting end and a straight cylinder part, the limiting end and the flange plate are located at the two axial ends of the straight cylinder part respectively, a mounting hole is formed in the flange plate, and the flange plate is arranged in the mounting hole. The external current transformer further comprises a circular-ring or circular-arc-shaped sealing reinforcing piece which is coaxial with the outer protective cover, the sealing reinforcing piece is located on the axial outer side of the turned-over edge, and a connecting hole for the fastening piece to penetrate through is formed in the sealing reinforcing piece. The GIS comprises the external current transformer. According to the utility model, the sealing reinforcer is additionally arranged at the end part of the flange of the outer protective cover, so that local warping of the flange is avoided, and the sealing effect between the outer protective cover and the flange plate or the mutual inductor cylinder is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high -voltage switch technical field, especially be related to a external current transformer and GIS. BACKGROUND

[0002] The current transformer is the important component unit of GIS switch equipment, the coil is set in the internal built -in current transformer of GIS shell, the coil is set in the external current transformer of GIS shell.

[0003] The built -in current transformer needs to set up shielding and support structure in order to avoid the built -in coil to GIS shell internal high potential field intensity influence and facilitate the assembly of coil, therefore cause the overall structure of built -in current transformer is relatively complex, and the built -in coil is located in the internal insulation gas chamber, very easy to introduce foreign matter in the process of assembly and cause the distortion of the internal electric field of insulation actually, the moisture treatment of built -in coil in the internal insulation gas chamber is very difficult, there is no effective means to solve the problem at present.

[0004] The external current transformer can avoid the above problems, therefore GIS equipment usually chooses external current transformer. For example, the Chinese invention patent application for public disclosure no. CN118197741A discloses a kind of external current transformer and GIS using the current transformer, the external current transformer includes for installing current transformer coil current transformer cylinder, for being fixedly connected with bus cylinder flange, fixed in current transformer cylinder and flange outside and with current transformer cylinder and flange together enclose coil installation space outer protective cover, outer protective cover is provided with the operating opening for hand to enter to carry out wiring operation, operating opening can be detachably connected with sealing cover plate.

[0005] The flange of the outer protective cover of the above-mentioned external current transformer is provided with an annular insertion slot on one end surface in the axial direction, the outer protective cover is inserted into the insertion slot in the axial direction, and a sealing strip is arranged in the insertion slot to enable the outer protective cover and the flange to be sealingly matched; the end of the outer protective cover away from the flange is provided with an inwardly folded flange, the flange is provided with a connecting hole for the bolt to pass through, the flange can be axially lapped with the edge of the current transformer cylinder, and a sealing ring is arranged between the edge of the current transformer cylinder and the flange of the outer protective cover. After the flange of the outer protective cover and the edge of the current transformer cylinder are tightly connected by the bolt, the outer protective cover can simultaneously press the sealing strip and the sealing ring, so that the axial ends of the outer protective cover are respectively sealed with the flange and the current transformer cylinder.

[0006] In order to ensure that the outer protective cover can be smoothly inserted into the slot, the wall thickness of the outer protective cover cannot be too thick, so the outer protective cover is prone to deformation under the action of a large local pressure. In order to enable the flange to be tightly pressed against the sealing ring, each bolt for fixing the flange has a large axial pressure on the flange, but the rest of the positions have no pressure, which causes the flange to be warped between two adjacent bolts, resulting in poor sealing effect. Moreover, the outer protective cover is formed by stamping a plate, and the wall thickness is relatively uniform. If the thickness of the outer protective cover is increased in order to avoid deformation of the flange under a large local pressure, on the one hand, the processing difficulty of the outer protective cover is increased, and the processing cost of the outer protective cover is increased, and on the other hand, the end of the outer protective cover matched with the slot is thickened, which is not convenient for insertion into the slot and cooperation with the sealing strip in the slot. Practical new type content

[0007] The utility model discloses a kind of external current transformers, to solve the technical problem that the flange of outer protective cover of prior art external current transformer is prone to partial warping under the extrusion of bolt and makes sealing effect worse.

[0008] Another purpose of the utility model is to provide a GIS to solve the above technical problems.

[0009] To achieve the above object, the technical scheme of the external current transformer provided by the utility model is:

[0010] An external current transformer includes a transformer cylinder, a flange plate and an outer protective cover. The outer protective cover includes a cover body and a flange folded inward at one axial end of the cover body. The transformer cylinder includes a limiting end and a straight cylinder part. The limiting end and the flange plate are located at the axial ends of the straight cylinder part respectively. One of the flange plate and the limiting end is provided with a sealing element axially abutting against the inner side of the flange. The flange is provided with a mounting hole through which a fastener passes to be fastened to the flange plate or the limiting end. The external current transformer further includes a circular ring or circular arc-shaped sealing reinforcement coaxially arranged with the outer protective cover. The sealing reinforcement is located at the axial outer side of the flange. The sealing reinforcement is provided with a connecting hole through which the fastener passes.

[0011] As a further improvement, the sealing reinforcement is circular arc-shaped. At least two sealing reinforcements are arranged along the circumferential direction of the flange.

[0012] As a further improvement, the size and structure of each sealing reinforcement are the same. The number of connecting holes on a single sealing reinforcement ranges from 2 to 4.

[0013] As a further improvement, the distance from the connecting hole to the radial outer edge of the sealing reinforcement is greater than or equal to the distance from the mounting hole to the radial outer edge of the sealing element.

[0014] As a further improvement, the radius of curvature of the radially outer edge of the sealing reinforcement is less than or equal to the radius of the outer edge of the flange.

[0015] As a further improvement, the axial thickness of the sealing reinforcement is 1-3 times the axial thickness of the flange.

[0016] As a further improvement, the axial thickness of the sealing reinforcement is 3-6 mm.

[0017] As a further improvement, the sealing reinforcement is fixedly connected to the flange.

[0018] As a further improvement, the fastening member is a fastening bolt, and the flange plate or the limiting end portion is provided with threaded holes corresponding to the mounting holes and the connecting holes and used for cooperating with the fastening bolt.

[0019] The external current transformer belongs to an improved invention. The external current transformer adds a sealing reinforcement to the flange end of the outer protective cover. In the case of the original structure, the axial pressure generated by a single fastening member can be evenly dispersed in the circumferential direction by the sealing reinforcement and transmitted to the flange, so that local warping of the flange is avoided, and the sealing effect between the outer protective cover and the flange plate or the transformer cylinder is effectively improved.

[0020] To achieve the above object, the technical scheme of the GIS provided by the utility model is:

[0021] The GIS comprises a bus cylinder and an external current transformer. The external current transformer comprises a transformer cylinder, a flange plate and an outer protective cover. The outer protective cover comprises a cover body and a flange folded inward at one axial end of the cover body. The transformer cylinder comprises a limiting end portion and a straight cylinder portion. The limiting end portion and the flange plate are respectively located at the axial two ends of the straight cylinder portion. One of the flange plate and the limiting end portion is provided with a sealing member axially abutting against the axial inner side of the flange. The flange is provided with mounting holes through which fastening members pass to fasten the flange plate or the limiting end portion. The external current transformer further comprises a sealing reinforcement in the form of a ring or an arc and coaxially arranged with the outer protective cover. The sealing reinforcement is located at the axial outer side of the flange. The sealing reinforcement is provided with connecting holes through which the fastening members pass.

[0022] As a further improvement, the sealing reinforcement is in the form of an arc, and at least two sealing reinforcements are closely arranged along the circumferential direction of the flange.

[0023] As a further improvement, the size and structure of each sealing reinforcement are the same, and the number of connecting holes on a single sealing reinforcement ranges from 2 to 4.

[0024] As a further improvement, the distance of the connection hole to the radially outer edge of the sealing reinforcement is greater than or equal to the distance of the mounting hole to the radially outer edge of the sealing.

[0025] As a further improvement, the radius of curvature of the radially outer edge of the sealing reinforcement is less than or equal to the radius of the outer edge of the flange.

[0026] As a further improvement, the axial thickness of the sealing reinforcement is 1-3 times the axial thickness of the flange.

[0027] As a further improvement, the axial thickness of the sealing reinforcement is 3-6 mm.

[0028] As a further improvement, the sealing reinforcement is fixedly connected to the flange.

[0029] As a further improvement, the fastening element is a fastening bolt, and the flange disc or the limiting end portion is provided with threaded holes corresponding to the mounting holes and the connection holes and used for cooperating with the fastening bolt.

[0030] The beneficial effect is that the GIS provided by the utility model belongs to an improved invention. The external current transformer in the GIS is provided with a sealing reinforcement at the flange end of the external protective cover. In the case where the original structure is not changed, the axial pressure generated by a single fastening element can be evenly dispersed in the circumferential direction by the sealing reinforcement and transmitted to the flange, so that local warping of the flange is avoided, and the sealing effect between the external protective cover and the flange disc or the transformer cylinder is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a sectional view of embodiment 1 of the GIS in the utility model;

[0032] Figure 2 is a structural schematic view of embodiment 1 of the GIS in the utility model;

[0033] Figure 3 is a partial sectional view of the slot portion of embodiment 1 of the GIS in the utility model;

[0034] Figure 4 is a partial sectional view of the flange portion of embodiment 1 of the GIS in the utility model;

[0035] Figure 5 is a structural schematic view of the external protective cover of embodiment 1 of the GIS in the utility model;

[0036] Figure 6 is a structural schematic view of the sealing reinforcement of embodiment 1 of the GIS in the utility model.

[0037] EXPLANATION OF REFERENCE NUMERALS:

[0038] 1, bus cylinder; 2, flange plate; 3, mutual inductor cylinder; 31, straight cylinder part; 32, limiting end part; 4, connecting cylinder; 5, insulating plate; 6, coil; 7, conductive rod; 8, outer protective cover; 81, cover body; 82, flange; 9, insertion groove; 10, sealing strip; 11, sealing element; 12, sealing groove; 13, mounting hole; 14, threaded hole; 15, fastening bolt; 16, sealing reinforcing element; 17, connecting hole. DETAILED DESCRIPTION

[0039] The utility model will be described in further detail below in combination with embodiments.

[0040] To solve the problems in the prior art, the basic concept of the utility model is to additionally provide a sealing reinforcing element at the flange end of the outer protective cover to avoid local warping of the flange.

[0041] The specific embodiment 1 of the GIS provided by the utility model is as follows:

[0042] Referring to Figs. 1 and 2, Figure 1 and Figs. 3 and 4, Figure 2 the GIS comprises, in sequence along the axial direction, a bus cylinder 1, a flange plate 2, a mutual inductor cylinder 3, a connecting cylinder 4, an insulating plate 5, a coil 6, and a conductive rod 7.

[0043] The mutual inductor cylinder 3 comprises limiting end parts 32 and straight cylinder parts 31. The GIS in this embodiment is of the three-phase common box type, and therefore the straight cylinder parts 31 are three parallel ones. Each straight cylinder part 31 is provided with one conductive rod 7, and each straight cylinder part 31 is provided with a coil 6. The limiting end parts 32 are fixedly connected to the axial one ends of the three straight cylinder parts 31 by welding. In other embodiments, the limiting end parts 32 can be integrally cast with the straight cylinder parts 31 or connected by other fixed connection modes, which is the prior art and will not be described here.

[0044] The flange plate 2 is fixedly installed at the axial other end of the straight cylinder part 31 by bolts. The bus cylinder 1 is fixedly connected to the axial other side of the flange plate 2 away from the limiting end part 32 by bolts. The connecting cylinder 4 is connected to the axial other side of the limiting end part 32 away from the flange plate 2 in a flange structure. The insulating plate 5 is connected to the connecting cylinder 4 in a flange structure.

[0045] An outer protective cover 8 is arranged between the flange plate 2 and the limiting end part 32 for sealing and protecting the coils 6 and playing a role of waterproofing and dustproofing. Referring to Fig. 5, Figure 5 the outer protective cover 8 is formed by stamping and comprises a cover body 81 and a flange 82 inwardly folded at the axial one end of the cover body 81.

[0046] Referring to Figs. 6 and 7, Figure 1 and Figs. 8 and 9, Figure 3The limiting end 32 is provided with an annular insertion slot 9 on the axial end surface of the flange 2, and a sealing strip 10 is arranged in the insertion slot 9. The cover body 81 is inserted into the insertion slot 9 in an axial direction away from the flange 82, and the outer protective cover 8 is sealed with the limiting end 32 by axially pressing the sealing strip 10.

[0047] Referring to the drawings Figure 1 and the drawings Figure 4 The flange 82 is located on the side of the flange 2 axially away from the limiting end 32. The flange 2 is provided with a sealing element 11 on the axial end surface away from the limiting end 32. The sealing element 11 is specifically a rubber sealing ring, which is installed through a sealing groove 12 provided on the corresponding end surface of the flange 2. During assembly, the axial inner side surface of the flange 82 is in axial abutment with the sealing element 11, so that the sealing element 11 is compressed and deformed to maintain a pressing force and a tight fit with the flange 82 and the flange 2, so as to realize sealing between the flange 82 and the flange 2.

[0048] The flange 82 is provided with 24 installation holes 13 for fasteners in a circumferential direction. The flange 2 is provided with threaded holes 14 corresponding to the installation holes 13 on the axial end surface. The threaded holes 14 are located radially inward of the sealing groove 12. The fastener in the embodiment is a fastening bolt 15. The fastening bolt 15 passes through the installation hole 13 and cooperates with the threaded hole 14, so as to press the flange 82 on the end surface of the flange 2.

[0049] The axial outer side of the flange 82 is provided with a sealing reinforcing element 16. The sealing reinforcing element 16 is used to disperse the pressure applied by the fastening bolt 15 in the circumferential direction and then transmit the pressure to the flange 82. Referring to the drawings Figure 6 The sealing reinforcing element 16 is provided with eight arc-shaped elements with the same structure and size. The eight sealing reinforcing elements 16 are closely arranged in the circumferential direction of the flange 82. Each sealing reinforcing element 16 is provided with three connecting holes 17 corresponding to the installation holes 13 on the flange 82.

[0050] During assembly, the connecting holes 17 on the sealing reinforcing element 16 are aligned with the installation holes 13 on the flange 82. Then the fastening bolt 15 passes through the connecting holes 17 and then passes through the installation holes 13, and finally cooperates with the threaded holes 14. After the fastening bolt 15 is tightened, the flange 82 is pressed in the axial direction with the sealing element 11, and the end of the cover body 81 is pressed with the sealing strip 10.

[0051] The sealing reinforcement 16 can transmit the local compression force of the fastening bolt 15 to the flange 82 in the circumferential direction, especially at the part between the two mounting holes 13 on the flange 82, to prevent the local buckling of the flange 82 from affecting the sealing effect. Moreover, the plurality of sealing reinforcements 16 are used together, so that the size of the single sealing reinforcement 16 is small, facilitating the processing and manufacturing, and also facilitating the assembly.

[0052] In the embodiment, the axial thickness of the sealing reinforcement 16 is 5 mm, which has higher strength relative to the flange 82 with a wall thickness of 2.5 mm, and can provide reliable support. In other embodiments, the axial thickness of the sealing reinforcement 16 can be selected in the range of 3-6 mm according to actual needs, or the axial thickness of the sealing reinforcement 16 can be selected in the range of 1-3 times the axial thickness of the flange 82. The thickness of the sealing reinforcement 16 cannot be too large, otherwise it will affect the processing and manufacturing and be difficult to assemble in the limited space.

[0053] In the embodiment, the radial width of the sealing reinforcement 16 needs to cover the range of the sealing member 11 to ensure better dispersion of the pressure and effectively avoid the deformation of the flange 82, and also needs to avoid the radial protrusion of the sealing reinforcement 16 outside the outer protective cover 8 after assembly. Specifically, the distance from the connecting hole 17 on the sealing reinforcement 16 to the radial outer edge of the sealing reinforcement 16 is greater than or equal to the distance from the mounting hole 13 to the radial outer edge of the sealing member 11, and the curvature radius of the radial outer edge of the sealing reinforcement 16 is less than or equal to the outer edge radius of the flange 82.

[0054] In the embodiment, the sealing reinforcement 16 and the flange 82 are independent of each other, which facilitates disassembly. In other embodiments, the sealing reinforcement 16 can be fixedly connected with the flange 82, so that the alignment operation of the connecting hole 17 and the mounting hole 13 is not needed during assembly. The fixed connection between the sealing reinforcement 16 and the flange 82 can be welding or gluing, which is not described herein.

[0055] In the embodiment, the fastener is the fastening bolt 15, which is convenient to operate. In other embodiments, the fastener can be a screw rod, which can be fixed on the flange plate 2 in advance, and then the screw rod is inserted through the mounting hole 13 and the connecting hole 17, and a nut is assembled on the screw rod.

[0056] In the embodiment, the size and structure of the sealing reinforcement 16 are the same, which facilitates batch processing and manufacturing. In other embodiments, the size and structure of the sealing reinforcement 16 can be different, and the number of the connecting holes 17 on the sealing reinforcement 16 can also be different.

[0057] In order to facilitate processing and manufacturing, and also to enable the sealing reinforcement 16 to play a better force transmission effect, three connecting holes 17 are arranged on the single sealing reinforcement 16 in the embodiment. In order to play the effect, the number of the connecting holes 17 on the sealing reinforcement 16 can also be 2-4, and of course the number of the connecting holes 17 on the single sealing reinforcement 16 can also be one in other embodiments. The number of the sealing reinforcements 16 is related to the number of the connecting holes 17 thereon, and in the case that the structural sizes of the sealing reinforcements 16 are the same, the fewer the number of the sealing reinforcements 16 is, the more the number of the connecting holes 17 thereon is. In order to facilitate assembly, the number of the sealing reinforcements 16 is least two and at most the same as the number of the fastening bolts 15, that is, one connecting hole 17 is arranged on the single sealing reinforcement 16.

[0058] The specific embodiment 2 of the GIS provided by the utility model is as follows:

[0059] The embodiment is based on the embodiment 1, and the difference from the embodiment 1 is that only one sealing reinforcement is arranged in the embodiment and the sealing reinforcement is a circular ring, and the sealing reinforcement is coaxial with the outer protective cover. The number of the connecting holes on the sealing reinforcement is 24, and the sealing reinforcement has higher integrity and can realize better pressure dispersion and prevent the flange from warping.

[0060] The specific embodiment 3 of the GIS provided by the utility model is as follows:

[0061] The embodiment is given to the embodiment 1, and the difference from the embodiment 1 is that the insertion slot is arranged on the limiting end part in the embodiment, and the threaded hole matched with the fastening bolt is arranged on the flange, that is, the outer protective cover is arranged in the axial direction opposite to the embodiment 1.

[0062] The specific embodiment of the external current transformer provided by the utility model is as follows:

[0063] The external current transformer is the external current transformer in the embodiments 1 or 2 or 3 of the GIS described above, and details are not repeated here.

[0064] Finally, it needs to be explained that the above-mentioned is only the preferred embodiment of the utility model, and is not used for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, and for the person skilled in the art, the technical scheme recorded in the foregoing embodiments can be modified without paying creative labor, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An external current transformer comprising a transformer cylinder, a flange and an external protective cover, the external protective cover comprising a cover body and a turned-in edge at one axial end of the cover body, the transformer cylinder comprising a limiting end and a straight cylinder portion, the limiting end and the flange being respectively located at the two axial ends of the straight cylinder portion, one of the flange and the limiting end being provided with a sealing element in axial abutting engagement with the axial inner side of the turned-in edge, the turned-in edge being provided with a mounting hole through which a fastener passes to fasten the flange or the limiting end, characterized in that, The external current transformer further comprises a sealing reinforcement in the shape of a ring or an arc and coaxially arranged with the outer protective cover, the sealing reinforcement being located axially outside the flange, and the sealing reinforcement being provided with connecting holes through which fasteners pass.

2. The current transformer according to claim 1, characterized in that The sealing reinforcement is in the shape of an arc, and at least two of the sealing reinforcements are closely arranged along the circumferential direction of the flange.

3. The current transformer of claim 2, wherein, The size and structure of each sealing reinforcement are the same, and the number of connecting holes on a single sealing reinforcement ranges from 2 to 4.

4. An external current transformer according to any one of claims 1 to 3, characterised in that, The distance from the connecting holes to the radially outer edge of the sealing reinforcement is greater than or equal to the distance from the mounting holes to the radially outer edge of the sealing reinforcement.

5. An external current transformer according to any one of claims 1-3, characterized in that The radius of curvature of the radially outer edge of the sealing reinforcement is less than or equal to the radius of the outer edge of the flange.

6. The current transformer according to any one of claims 1 to 3, characterized in that The axial thickness of the sealing reinforcement is 1-3 times the axial thickness of the flange.

7. The current transformer according to any one of claims 1 to 3, characterized in that The axial thickness of the sealing reinforcement is 3-6 mm.

8. The current transformer according to any one of claims 1 to 3, characterized in that The sealing reinforcement is fixedly connected with the flange.

9. The current transformer according to any one of claims 1 to 3, characterized in that The fasteners are fastening bolts, and the flange plate or the limiting end portion is provided with threaded holes corresponding to the mounting holes and the connecting holes and used for cooperating with the fastening bolts.

10. A GIS comprising a busbar cylinder and an external current transformer, characterized in that The external current transformer is the external current transformer according to any one of claims 1-9.

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