Gas-insulated power transmission device

Abstract

The gas-insulated power transmission device of the present invention comprises: a housing; the partition plate is arranged in the shell and divides the space in the shell into a first chamber and a second chamber which are isolated from each other, the partition plate comprises a body and a conductive insert embedded in the body, and the two ends of the conductive insert extend into the first chamber and the second chamber respectively; the first power transmission element is arranged in the first chamber, the second power transmission element is arranged in the second chamber, and the first power transmission element and the second power transmission element are electrically connected with the conductive insert; and at least one of the first power transmission element and the second power transmission element is mechanically and electrically connected with the conductive insert in a welding manner. At least one of the first power transmission element and the second power transmission element is mechanically and electrically connected with the conductive insert in a welding manner, so that the power transmission equipment welded with the conductive insert does not need a complex conductor shielding structure.

Description

Technical Field

[0001] This invention relates to the field of high-voltage / ultra-high-voltage power transmission, and more specifically to gas-insulated power transmission devices. Background Technology

[0002] In GIS / GIL products, partitions are used to separate compartments and are airtight to prevent air leakage or contamination between adjacent compartments. Partitions are generally made of materials with insulating and mechanical properties to ensure normal operation throughout the product's lifespan. During maintenance and repair, the partitions must also withstand the pressure difference across the compartment to ensure safe and reliable maintenance activities. This requires the partitions to have a mechanical strength capable of withstanding at least three times the design pressure.

[0003] Existing separator inserts require complex shielding structures to connect with conductors. Summary of the Invention

[0004] To address at least one technical problem of the prior art, the present invention provides a gas-insulated power transmission device.

[0005] A gas-insulated power transmission device includes: a housing; a partition disposed within the housing and dividing the space within the housing into a first chamber and a second chamber isolated from each other, the partition including a body and a conductive insert embedded in the body, the two ends of the conductive insert extending into the first chamber and the second chamber respectively; a first power transmission element and a second power transmission element, the first power transmission element being disposed in the first chamber and the second power transmission element being disposed in the second chamber, the first power transmission element and the second power transmission element being electrically connected to the conductive insert respectively, and at least one of the first power transmission element and the second power transmission element being mechanically and electrically connected to the conductive insert by welding.

[0006] In some embodiments, the first power transmission element and the second power transmission element are mechanically and electrically connected to the conductive insert by welding, respectively.

[0007] In some embodiments, there are three conductive inserts, which are spaced apart from each other in the circumferential direction of the body.

[0008] In some embodiments, the conductive insert includes a tube with a hollow cavity extending axially along the partition and a plug hermetically welded to one end of the cavity or inside the cavity to seal the cavity; or, the conductive insert is a solid conductor extending axially along the partition; or, the conductive insert is a solid conductor with both ends processed into a tubular shape and a portion of thickness retained in the middle as an air gap.

[0009] In some embodiments, the housing includes a first housing and a second housing. One port of the first housing has a first flange, and one port of the second housing has a stepped second flange. The second flange has a first stepped surface and a second stepped surface facing the first housing. In the radial direction of the body, the first stepped surface surrounds the outside of the second stepped surface, and in the axial direction of the body, the first stepped surface is closer to the first housing than the second stepped surface. The body includes a first side facing the first chamber and a second side facing the second chamber. The second side has a sealing surface at its edge. A third flange is connected to the second flange and presses the periphery of the body against the second stepped surface. The sealing surface faces the second stepped surface, and a second sealing ring is provided between the sealing surface and the second stepped surface.

[0010] In some embodiments, the second sealing ring is disposed in a sealing groove located on the second step surface.

[0011] In some embodiments, a first sealing ring is provided between the third flange and the first stepped surface, the first flange of the first housing is connected to the third flange, and the first flange and the third flange are sealed by the third sealing ring.

[0012] In some embodiments, the first side has an abutment surface near the edge, the third flange is pressed against the abutment surface, a first positioning hole is provided on the abutment surface, and a second positioning hole corresponding to the first positioning hole is provided on the third flange, and positioning pins are provided in the first positioning hole and the second positioning hole.

[0013] In some embodiments, the inner or outer ring of the body located radially on the sealing surface has a raised surface that is higher than the sealing surface.

[0014] In some embodiments, the contact surface is provided with a vent groove extending radially along the body, and the vent groove communicates with the first chamber.

[0015] Since at least one of the first and second power transmission elements is mechanically and electrically connected to the conductive insert by welding, the power transmission equipment welded to the conductive insert does not require a complex conductor shielding structure. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A cross-sectional view along the axial direction is shown of a gas-insulated power transmission device according to some embodiments of the present disclosure.

[0018] Figure 2 It shows Figure 1 A partially enlarged view of the partition and flange mounting structure of the gas-insulated power transmission device shown.

[0019] Figure 3 A perspective view of the partition of a gas-insulated power transmission device according to some embodiments of the present disclosure is shown.

[0020] Figure 4 A perspective view of the partition of a gas-insulated power transmission device according to some embodiments of the present disclosure is shown from another angle.

[0021] Figure 5 A partially enlarged view of the sealing surface of a gas-insulated power transmission device according to some embodiments of the present disclosure is shown.

[0022] Symbol explanation: Casing 1 Partition 2 First power transmission element 3 Second power transmission element 4 Room 5, Room 1 Second Room 6 Ontology 7 Conductive insert 8 First shell 9 Second shell 10 First flange 11 Second flange 12 First step surface 13 Second step surface 14 First side view 15 Second side 16 Sealing surface 17 18-inch mating surface Third flange 19 First sealing ring 20 Second sealing ring 21 First positioning hole 22 Positioning pin 23 Third sealing ring 24 25 raised surfaces Ventilation slot 26 27 plugs Concave 28 Groove 29 Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] This disclosure provides a gas-insulated power transmission device, which includes a housing 1, a partition 2, a first power transmission element 3, and a second power transmission element 4. The partition 2 is disposed within the housing 1 and divides the space within the housing 1 into a first chamber 5 and a second chamber 6 that are isolated from each other. The partition 2 includes a body 7 and a conductive insert 8 embedded in the body 7. The two ends of the conductive insert 8 extend into the first chamber 5 and the second chamber 6, respectively. The first power transmission element 3 is disposed in the first chamber 5, and the second power transmission element 4 is disposed in the second chamber 6. The first power transmission element 3 and the second power transmission element 4 are electrically connected to the conductive insert 8, and at least one of the first power transmission element 3 and the second power transmission element 4 is mechanically and electrically connected to the conductive insert 8 by welding.

[0026] The housing 1 can be a metal shell-like object that defines an inner cavity for accommodating the power transmission equipment. Preferably, the housing 1 has a circular cross-section.

[0027] The partition 2 divides the space inside the shell 1 into a first chamber 5 and a second chamber 6 that are not ventilated to each other, thus preventing the leakage of insulating gas between the different chambers.

[0028] The conductive insert 8 of the partition 2 transmits current between the first power transmission element 3 in the first chamber 5 and the second power transmission element 4 in the second chamber 6.

[0029] Since at least one of the first power transmission element 3 and the second power transmission element 4 is mechanically and electrically connected to the conductive insert 8 by welding, the power transmission equipment welded to the conductive insert 8 does not require a complex conductor shielding structure. More specifically, the first power transmission element 3 is welded to the conductive insert 8, or the second power transmission element 4 is welded to the conductive insert 8, or both the first power transmission element 3 and the second power transmission element 4 are welded to the conductive insert 8.

[0030] In some embodiments, the partition 2 has three conductive inserts 8, which are spaced apart from each other in the circumferential direction of the body 7. Therefore, the partition 2 can be connected to three-phase power transmission equipment.

[0031] In some embodiments, the first power transmission element 3 includes a conductor, and the second power transmission element 4 includes a conductor. Further, the first power transmission element 3 includes three conductors respectively welded to three conductive inserts 8, and the second power transmission element 4 includes three conductors respectively welded to the conductive inserts 8. Exemplarily, the conductors are hollow, rod-shaped, conductive metal rods. The conductors are coaxially arranged with the conductive inserts 8, and the ends of the conductors are butt-joined and welded to the ends of the conductive inserts 8.

[0032] The body 7 is constructed to have sufficient strength to support the power transmission equipment and to be electrically insulating. Exemplarily, the body 7 has a shape adapted to the cross-section of the housing 1, for example, the body 7 is circular. The body 7 is made of an insulating material, for example, epoxy resin.

[0033] The body 7 is disposed within the housing 1, and its periphery is hermetically sealed to the housing 1. For example, the housing 1 includes a first housing 9 and a second housing 10. One port of the first housing 9 has a first flange 11, and one port of the second housing 10 has a stepped second flange 12. The second flange 12 has a first stepped surface 13 and a second stepped surface 14 facing the first housing 9. In the radial direction of the body, the first stepped surface 13 surrounds the outside of the second stepped surface 14, and in the axial direction of the body 7, the first stepped surface 13 is closer to the first housing 9 relative to the second stepped surface 14. The body 7 includes a first side surface 15 facing the first chamber 5 and a second side surface 16 facing the second chamber 6. The second side surface 16 has a sealing surface 17 near its edge, and the first side surface 15 has an abutment surface 18 near its edge. The periphery of the body 7 is disposed on the step of the second flange 12. Specifically, the sealing surface 17 abuts the second stepped surface 14, and a third flange 19 presses the periphery of the body 7 onto the second stepped surface 14, thereby fixing the body 7. The third flange 19 is an independent flange other than the first flange 11 and the second flange 12. A first sealing ring 20 is provided between the third flange 19 and the first stepped surface 13, and a second sealing ring 21 is provided between the sealing surface 17 and the second stepped surface 14. More specifically, the second sealing ring 21 is disposed in a sealing groove formed on the second stepped surface 14. The third flange 19 is pressed against the abutment surface 18, on which a first positioning hole 22 is provided, and on the third flange 19 a second positioning hole corresponding to the first positioning hole 22 is provided. Positioning pins 23 are provided in the first positioning hole and the second positioning hole to prevent the body 7 from rotating. The first flange 11 of the first housing 9 is connected to the third flange 19, and the two are sealed by the third sealing ring 24.

[0034] In some embodiments, such as Figure 5 As shown, the inner or outer ring located radially on the sealing surface 17 has a raised surface 25 that is higher than the sealing surface 17. The sealing surface 17 is located at a lower position relative to the raised surface 25, which reduces the risk of damage to the sealing surface 17 during handling and installation, thus eliminating the need for machining after the partition 2 is cast.

[0035] In some embodiments, the first side surface 15 includes a concave surface 28, which is adjacent to the abutment surface 18 and disposed within the circumferential region enclosed by the abutment surface 18. A venting groove 26 is provided on the abutment surface 18, which radially connects the outer edge and inner edge of the abutment surface 18. The venting groove 26 communicates with the groove 29 formed by the concave surface 28. During evacuation of the air chamber, the gap between the side surface of the partition 2 and the second flange 12, the gap between the abutment surface 18 and the third flange 19, and the residual gas in the first positioning hole 22 and the second positioning hole can be easily removed through the venting groove 26. Furthermore, the insulating gas introduced can fully fill the gaps, thereby preventing partial discharge at the gaps.

[0036] The conductive insert 8 is airtight. For example, the conductive insert 8 includes a tube with a hollow cavity extending along the axial direction of the partition 2 and a plug 27 that is airtightly welded to one end of the cavity or inside the cavity of the tube to seal the cavity.

[0037] In some other embodiments, the conductive insert 8 is a solid conductor extending axially along the partition 2.

[0038] In some other embodiments, some material at both ends of the solid conductor can be removed, so that the two ends of the solid conductor are tubular and a portion of the thickness in the middle is retained as an air gap.

[0039] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas insulated power transmission device, characterized by The application relates to a shell, a partition plate arranged in the shell and separating a space in the shell into a first chamber and a second chamber isolated from each other, the partition plate comprising a body and a conductive insert embedded on the body, two ends of the conductive insert extending into the first chamber and the second chamber respectively, a first power transmission element arranged in the first chamber and a second power transmission element arranged in the second chamber, the first power transmission element and the second power transmission element being electrically connected with the conductive insert, and at least one of the first power transmission element and the second power transmission element being mechanically and electrically connected with the conductive insert by welding. The first power transmission element and the second power transmission element are mechanically and electrically connected with the conductive insert by welding. The conductive insert has three, three of which are spaced apart from each other in the circumferential direction of the body. The conductive insert comprises a hollow-tube pipe extending in the axial direction of the partition plate and a plug airtightly welded at one end or inside the lumen of the pipe to seal the lumen.

2. The gas insulated power transmission device according to claim 1, characterized by Alternatively, the conductive insert is a solid conductor extending in the axial direction of the partition plate.

3. The gas insulated power transmission device according to claim 1, characterized by Alternatively, the conductive insert is a solid conductor with both ends processed into a tubular shape and a part of thickness reserved as an air gap at the middle position.

4. The gas insulated power transmission device according to claim 1, characterized by The shell comprises a first shell and a second shell, one end of the first shell has a first flange, one end of the second shell has a second flange with a step, The second flange has a first step surface and a second step surface facing the first shell, the first step surface surrounds the second step surface outside in the radial direction of the body and is closer to the first shell than the second step surface in the axial direction of the body, The body comprises a first side surface facing the first chamber and a second side surface facing the second chamber, the second side surface has a sealing surface at the edge position, 5. The gas insulated power transmission device according to any one of claims 1 to 4, characterized by A third flange is connected with the second flange and presses the circumference of the body on the second step surface, the sealing surface faces the second step surface, and a second sealing ring is arranged between the sealing surface and the second step surface. The second sealing ring is arranged in a sealing groove on the second step surface. A first sealing ring is arranged between the third flange and the first step surface, the first flange of the first shell is connected with the third flange, and the first flange and the third flange are sealed by a third sealing ring. The first side surface has an abutting surface at the edge position, the third flange is pressed on the abutting surface, a first positioning hole is arranged on the abutting surface, a second positioning hole corresponding to the first positioning hole is arranged on the third flange, and a positioning pin is arranged in the first positioning hole and the second positioning hole.

6. The gas insulated power transmission device according to claim 5, characterized by A convex surface higher than the sealing surface is arranged in the inner ring or the outer ring of the sealing surface in the radial direction of the body.

7. The gas insulated power transmission device according to claim 5, characterized by ​ 8. The gas insulated power transmission device according to claim 5, characterized by ​ 9. The gas insulated power transmission device according to claim 5, characterized by ​ 10. The gas insulated power transmission device according to claim 8, characterized by The first side surface comprises a concave surface adjacent to the abutment surface and arranged in a circumferential region of the abutment surface, the abutment surface being provided with a ventilation groove which communicates with the outer edge and the inner edge of the abutment surface in the radial direction of the body and which communicates with a groove formed by the concave surface.

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