Dry-type capacitive porcelain-jacketed high-current transformer bushing

Abstract

The invention discloses a dry-type capacitive porcelain sleeve large-current transformer bushing which comprises a current carrier, a porcelain sleeve, a sealing gasket, a flange, a dry-type capacitor core, an oil end bottom plate, a butterfly-shaped gasket, a connecting sleeve and a fixing bolt. A certain gap is reserved between the upper end of the dry-type capacitor core and the current carrier, the groove is arranged on the inner side of the upper port of the flange, and the groove is communicated with the surface of the flange through a plurality of round holes, so that the oil flow circulation range is expanded, the heat dissipation efficiency of the current carrier is improved, the temperature rise is reduced, the height tolerance requirement on a porcelain bushing is also reduced by reserving the gap at the upper end, the structure is simple, and the cost is low. And the assembly efficiency of the sleeve is improved. The oil end tightens the current carrier while fastening and pressing the oil end bottom plate through the bolt, so that the current carrier effectively fixes the porcelain bushing, the two ends of the porcelain bushing are effectively sealed, the structure is compact, and the height space is saved.

Description

Technical Field

[0001] This invention relates to a bushing, specifically to a dry-type capacitor-type porcelain-insulated high-current transformer bushing. Background Technology

[0002] Currently, dry-type capacitor-type ceramic-jacketed high-current transformer bushings have complex structures and the following disadvantages: The oil end is fixed by a spring-loaded plate structure. The tightening force of the mounting bolts at the fluid-carrying end is applied to the capacitor core after passing through the spring. This structure is relatively long, and the size compatibility is poor when replacing old bushings in bushing replacement projects. Springs are used extensively, and long-term stress on the springs can lead to permanent deformation and pressure relaxation due to fatigue, which is detrimental to structural stability and sealing reliability.

[0003] The gap between the core and the porcelain jacket of a bushing-type dry capacitor is sealed and filled with insulating grease, resulting in a complex sealing structure. The insulation material of the dry capacitor core has poor thermal conductivity, and the current carrier must be of a larger specification to reduce temperature rise, which makes the manufacturing cost of the bushing higher.

[0004] It has a complex structure, many parts, difficult manufacturing process, and low production efficiency.

[0005] Both the flange and the air end are equipped with vent holes, resulting in multiple venting points after the sleeve is installed. Summary of the Invention

[0006] The purpose of this invention is to provide a dry-type capacitor-type ceramic-jacketed high-current transformer bushing with a simple structure, flexible size, low temperature rise, reduced manufacturing cost, and improved production efficiency.

[0007] This invention provides a dry-type capacitor-type porcelain-insulated high-current transformer bushing, comprising a current carrier, a porcelain bushing, a sealing gasket, a flange, a dry-type capacitor core, an oil end base plate, a butterfly gasket, a connecting sleeve, and fixing bolts. The key feature is that the dry-type capacitor core is fixed to the flange, the porcelain bushing is located between the flange and the current carrier, sealing gaskets are provided at both ends of the porcelain bushing, and an oil end base plate is provided at the bottom of the dry-type capacitor core.

[0008] A certain gap is reserved between the upper end of the dry capacitor core and the current carrier.

[0009] The upper end disc of the fluid carrier is provided with a vent hole.

[0010] The flange has a groove on the inner side of the upper port, and there are several round holes connecting the groove and the flange surface.

[0011] The oil end base plate has several round holes. The bottom surface of the fluid carrier has several screw holes that are directly opposite the round holes of the oil end base plate. The fixing bolts are inserted into the connecting sleeve. After the connecting sleeve is fitted with several butterfly washers, it is inserted into the round holes of the oil end base plate. The fixing bolts are screwed into the screw holes on the end face of the fluid carrier. The present invention provides a dry-type capacitor-type porcelain-insulated high-current transformer bushing with the following advantages: a certain gap is reserved between the upper end of the dry-type capacitor core and the current carrier. When the bushing is running, the current carrier heats up due to the flow, and the transformer oil circulates inside and outside the capacitor core through the gap, which is conducive to the heat dissipation of the current carrier and reduces the temperature rise; the reserved gap also reduces the height tolerance requirements of the porcelain insulator, the structure is simple, and the assembly efficiency of the bushing is improved.

[0012] The inner side of the flange port is connected to the flange surface through a groove and several round holes. This allows the transformer oil to flow into the current-carrying body, and then some of the transformer oil flows to the gap between the dry capacitor core and the porcelain jacket, and flows back into the transformer tank through the flange. Compared with the traditional heat dissipation method that only allows oil to flow inside the dry capacitor core, the oil circulation range is expanded and the heat dissipation efficiency is improved.

[0013] There is no need to install a vent hole at the flange position of the sleeve; only the upper disc has a vent hole, which reduces the workload of installing the sleeve.

[0014] The oil end structure tightens the oil end base plate with bolts while simultaneously tightening the fluid carrier, which also effectively fixes the porcelain sleeve. The two ends of the porcelain sleeve are effectively sealed, resulting in a compact structure that saves height space. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of the present invention—a dry-type capacitor-type porcelain-insulated high-current transformer bushing.

[0016] Figure 2 yes Figure 1 A sectional view.

[0017] The diagram includes: 1. Current carrier; 2. Porcelain sleeve; 3. Sealing gasket; 4. Sealing gasket; 5. Flange; 6. Dry capacitor core; 7. Oil end base plate; 8. Butterfly gasket; 9. Connecting sleeve; 10. Fixing bolt. Detailed Implementation

[0018] One embodiment of the present invention is illustrated in the appendix. Figure 1 and Figure 2 As shown, it includes a current carrier 1, a porcelain sleeve 2, a sealing gasket 3, a sealing gasket 4, a flange 5, a dry capacitor core 6, an oil end base plate 7, a butterfly gasket 8, a connecting sleeve 9, and a fixing bolt 10.

[0019] The dry capacitor core 6 is fixed to the flange 5, the porcelain sleeve 2 is between the flange 5 and the current carrier 1, and the porcelain sleeve 2 is provided with sealing gaskets 3 and 4 at both ends. The bottom of the dry capacitor core 6 is provided with an oil end base plate 7.

[0020] A certain gap is reserved between the upper end of the dry capacitor core 6 and the current carrier 1.

[0021] The upper end of the fluid carrier 1 is provided with a vent hole.

[0022] The inner side of the upper port of flange 5 is provided with a groove, and there are several round holes connecting the groove and the flange 5.

[0023] The oil end base plate 7 has several round holes. The bottom surface of the fluid carrier 1 has several screw holes that are directly opposite the several round holes of the oil end base plate 7. The fixing bolt 10 is inserted into the connecting sleeve 9. After the connecting sleeve 9 is fitted with several butterfly washers 8, it is inserted into the round holes of the oil end base plate 7. The fixing bolt 10 is screwed into the screw hole on the end face of the fluid carrier 1. The above preferred embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, all equivalent technical solutions fall within the protection scope of the invention.

Claims

1. A dry-type capacitor-type porcelain-insulated high-current transformer bushing, comprising a current carrier, a porcelain bushing, a sealing gasket, a flange, a dry-type capacitor core, an oil end base plate, a butterfly gasket, a connecting sleeve, and fixing bolts; characterized in that: The dry capacitor core is fixed to the flange, the porcelain bushing is between the flange and the current carrier, the porcelain bushing is provided with sealing rings at both ends, and the dry capacitor core is provided with an oil end base plate.

2. The dry-type capacitor-type porcelain-insulated high-current transformer bushing as described in claim 1, characterized in that: A certain gap is reserved between the upper end of the dry capacitor core and the current carrier.

3. The dry-type capacitor-type porcelain-insulated high-current transformer bushing as described in claim 1, characterized in that: The upper end disc of the fluid carrier is provided with a vent hole.

4. The dry-type capacitor-type porcelain-insulated high-current transformer bushing as described in claim 1, characterized in that: The flange has a groove on the inner side of the upper port, and there are several round holes connecting the groove and the flange surface.

5. A dry-type capacitor-type porcelain-insulated high-current transformer bushing as described in claim 1, characterized in that: The oil end base plate has several round holes. The bottom surface of the fluid carrier has several screw holes that are directly opposite the round holes of the oil end base plate. The fixing bolt is inserted into the connecting sleeve. After the connecting sleeve is fitted with several butterfly washers, it is inserted into the round holes of the oil end base plate. The fixing bolt is screwed into the screw holes on the end face of the fluid carrier.

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