Capacitive bushing oil pillow and capacitive bushing

Abstract

This invention discloses an oil conservator for capacitive bushings, comprising: an oil conservator body, the bottom plate of which has an oil leakage hole, the bottom plate being an end plate near the outer insulating ceramic component; and an oil guide pipe, the first end of which is sealed and connected to the oil leakage hole, and the second end of which is inside the oil conservator body and extends away from the first end of the oil guide pipe. When the oil conservator body is vertically arranged, any position of the oil guide pipe is below the transformer oil level inside the oil conservator body. When the oil conservator body is horizontally arranged, the vertical height of at least one position of the oil guide pipe is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating ceramic component. This invention eliminates the need to raise the head of the capacitive bushing during long-term storage, preventing transformer oil from flowing into the oil conservator from the outer insulating ceramic component, thus avoiding exposure of the capacitor core and reducing the maintenance difficulty of the capacitive bushing. This invention also discloses a capacitive bushing.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to an oil conservator for a capacitor bushing and a capacitor bushing. Background Technology

[0002] Transformer bushings are the main external insulation devices of transformer tanks. The leads of transformer windings must pass through the insulating bushings to insulate between leads and between leads and the transformer casing, while also fixing the leads in place. Capacitive bushings are generally used on high-voltage transformers above 100kV and consist of a capacitor core, external insulating porcelain components, oil conservator, spring assembly, equalizing ball, terminals, insulating oil, etc.

[0003] The capacitor core is wound around a central conductive tube, which passes through an outer insulating porcelain component and is electrically connected to terminals at both ends. The portion of the capacitor core inside the outer insulating porcelain component needs to be immersed in transformer oil. An oil conservator is connected to the upper part of the outer insulating porcelain component via a flange. Currently, the bottom plate of the oil conservator in capacitive bushings has oil leakage holes, and during operation, the transformer oil inside the capacitive bushing is in a continuous state. When the capacitive bushing is placed horizontally, transformer oil flows into the oil conservator, exposing the capacitor core.

[0004] If capacitive bushings are to be stored for a long period of time, it is generally required that the head of the capacitive bushing be raised by more than 10° to raise the height of the oil conservator and prevent the transformer oil inside the outer insulating porcelain parts from flowing into the oil conservator. This ensures that the capacitor core is completely submerged in the transformer oil during long-term storage, which brings inconvenience to the operation and maintenance of capacitive bushings.

[0005] Therefore, how to prevent transformer oil from flowing into the oil tank from the external insulating ceramic parts without raising the head when storing capacitive bushings for a long time is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method that, when storing a capacitive bushing for a long time, prevents transformer oil inside the outer insulating ceramic component from flowing into the oil tank without raising the head.

[0007] Another object of the present invention is to provide a capacitive bushing having the above-mentioned capacitive bushing oil conservator.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An oil conservator for a capacitive bushing includes:

[0010] The oil conservator body has a central conductive tube for penetrating through it. The bottom plate of the oil conservator body has an oil leakage hole for connecting to the transformer oil cavity of the outer insulating porcelain of the capacitive bushing. The bottom plate of the oil conservator body is the end plate of the oil conservator body near the outer insulating porcelain.

[0011] The oil guide pipe has a first end that is sealed and connected to the oil leakage hole, and a second end that is connected to the oil conservator body and extends away from the first end of the oil guide pipe. When the oil conservator body is arranged vertically, any position of the oil guide pipe is below the transformer oil level in the oil conservator body. When the oil conservator body is arranged horizontally, the vertical height of at least one position of the oil guide pipe is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain part.

[0012] Optionally, in the above-mentioned capacitive bushing oil conservator, the oil guide pipe is arranged around the inner wall of the oil conservator body, and at least around half of the inner wall of the oil conservator body.

[0013] Optionally, in the above-mentioned capacitive bushing oil conservator, an oil level gauge for detecting the transformer oil level inside the oil conservator body is provided in the oil conservator body.

[0014] In the first direction, each position of the oil guide pipe is arranged closer to the bottom plate of the oil conservator body than the oil level gauge, and the first direction is the axial direction of the central conductive pipe.

[0015] Optionally, in the above-mentioned capacitive bushing oil conservator, the first end and the second end of the oil guide tube are respectively located at positions symmetrically aligned with the axis of the central conductive tube.

[0016] Optionally, in the above-mentioned capacitive bushing oil conservator, the oil leakage hole is a threaded hole, and the first end of the oil guide pipe is installed at the threaded hole through a threaded sealing joint.

[0017] Optionally, in the above-mentioned capacitive bushing oil conservator, the oil guide tube includes a vertical section communicating with the threaded sealing joint and a circumferential section communicating with the vertical section. The vertical section extends from the bottom plate of the oil conservator body to the end away from the bottom plate. The bottom plate of the oil conservator body is the end plate of the oil conservator body near the outer insulating ceramic piece.

[0018] The surrounding section is arranged around the inner wall of the oil pillow body.

[0019] Optionally, in the above-mentioned capacitive bushing oil conservator, the surrounding section is located at the same position along a first direction, which is the axial direction of the central conductive tube.

[0020] Optionally, in the above-mentioned capacitive bushing oil conservator, the oil guide tube is made of copper, with an inner diameter of φ8mm~φ12mm and a wall thickness of 0.8mm~1.2mm.

[0021] The oil conservator for capacitor bushings provided by this invention adds an oil guide pipe to the oil conservator body. The first end of the oil guide pipe is sealed and connected to the oil leakage hole, and the second end extends away from the first end of the oil guide pipe. When the oil conservator body is arranged vertically, any position of the oil guide pipe is below the transformer oil level in the oil conservator body, so that the oil conservator body and the transformer oil cavity of the outer insulating porcelain are in a state of communication. The transformer oil in the transformer oil cavity of the outer insulating porcelain can enter the oil guide pipe through the oil leakage hole and flow into the oil conservator body through the second end of the oil guide pipe. Correspondingly, the transformer oil in the oil conservator body can enter the oil guide pipe through the second end of the oil guide pipe and flow into the transformer oil cavity of the outer insulating porcelain through the oil leakage hole through the first end of the oil guide pipe. This realizes free flow between the oil conservator body and the transformer oil cavity of the outer insulating porcelain, so that the transformer oil in the transformer oil cavity of the outer insulating porcelain is replenished by the oil conservator body, and the transformer oil circulates through the oil guide pipe, so that the capacitor core is completely immersed in the transformer oil during normal use.

[0022] When the oil conservator body is arranged horizontally, the vertical height of at least one position of the oil guide pipe is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain component. This ensures that the oil conservator body and the transformer oil cavity of the outer insulating porcelain component are in a cut-off state, preventing the transformer oil in the transformer oil cavity of the outer insulating porcelain component from flowing into the oil conservator body through the oil guide pipe. This ensures that there is sufficient transformer oil in the transformer oil cavity of the outer insulating porcelain component, preventing the capacitor core from being exposed outside the transformer oil due to transformer oil loss. When the capacitive bushing is stored for a long time, there is no need to raise the head of the capacitive bushing, which also prevents the transformer oil in the outer insulating porcelain component from flowing into the oil conservator and avoids the capacitor core from being exposed, thus reducing the operation and maintenance difficulty of the capacitive bushing.

[0023] A capacitive bushing includes an outer insulating ceramic component, an oil conservator, a central conductive tube disposed within the oil conservator, and a spring assembly disposed within the oil conservator and located outside the central conductive tube. One end of the central conductive tube extends out of the oil conservator, and the other end extends into the outer insulating ceramic component. A sealing joint is connected to the end of the central conductive tube extending out of the oil conservator. The oil conservator is an oil conservator for a capacitive bushing as described in any of the preceding claims. The oil guide tube is located on the side of the spring assembly away from the central conductive tube.

[0024] Optionally, in the above-mentioned capacitive bushing, the end of the oil conservator body away from the base plate has an installation opening, one end of the central conductive tube extends out of the oil conservator through the installation opening, and the sealing joint is sealed and installed at the installation opening through a double pressure cap.

[0025] Optionally, in the above-mentioned capacitive bushing, the double pressure cap includes:

[0026] The first pressure cap has a central region and an edge region located outside the central region. The central region has a recessed platform that sinks into the mounting opening. The recessed platform has a first pressure cap hole for the central conductive tube to extend out. The edge region is fixed to the oil tank body by fasteners. The edge region and the oil tank body, as well as the first pressure cap hole and the central conductive tube, are sealed by seals. The sealing joint is fixed to the edge region of the first pressure cap by fasteners.

[0027] The second pressure cap is recessed in the direction of the mounting opening to form a groove on the side of the recess facing the sealing joint. The second pressure cap is fixed in the groove by fasteners. The second pressure cap has a second pressure cap hole for the central conductive tube to extend out. The second pressure cap and the first pressure cap, as well as the second pressure cap hole and the central conductive tube, are sealed by a sealing element.

[0028] The capacitive bushing provided by the present invention has all the technical effects of the aforementioned capacitive bushing oil conservator, which will not be repeated here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a partial structural schematic diagram of the capacitive bushing disclosed in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the double pressure cap sealing structure disclosed in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the oil reservoir disclosed in an embodiment of the present invention;

[0033] Figure 4 This is a top view of the interior of the oil reservoir disclosed in an embodiment of the present invention.

[0034] Figures 1 to 4 The meanings of the various reference numerals in the attached figures are as follows:

[0035] 101 is a sealing joint, 102 is a spring assembly, 103 is an oil conservator body, 104 is an oil guide pipe, 105 is an oil level gauge, 106 is a central conductive pipe, 107 is a first pressure cap, 108 is a second pressure cap, and 109 is a threaded sealing joint. Detailed Implementation

[0036] The core of this invention is to provide an oil conservator for capacitive bushings, so that when the capacitive bushing is stored for a long time, there is no need to raise the head, and the transformer oil inside the outer insulating porcelain part can be prevented from flowing into the oil conservator.

[0037] Another key aspect of this invention is to provide a capacitive bushing having the aforementioned capacitive bushing oil conservator.

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figure 1 and 3 As shown, an embodiment of the present invention discloses an oil conservator for a capacitive bushing, comprising an oil conservator body 103 and an oil guide pipe 104.

[0040] The central conductive tube 106 of the capacitive bushing is used to penetrate the oil conservator body 103. The bottom plate of the oil conservator body 103 has an oil leakage hole (not shown in the figure). The oil leakage hole is used to connect to the transformer oil cavity of the outer insulating porcelain of the capacitive bushing, so that when the volume of transformer oil expands or contracts with changes in oil temperature, the oil conservator body 103 can store and replenish oil through the oil leakage hole. The bottom plate of the oil conservator body 103 is the end plate of the oil conservator body 103 near the outer insulating porcelain.

[0041] To further ensure that transformer oil does not flow back when the capacitive bushing is placed horizontally, the gap between the oil conservator body 103 and the central conductive pipe 106 is sealed, preventing direct communication between the upper and lower spaces of the oil conservator body 103. Specifically, the gap between the bottom plate of the oil conservator body 103 and the central conductive pipe 106 can be sealed with sealing rubber.

[0042] The key feature of this embodiment is the addition of an oil guide tube 104, with its first end sealed and connected to the oil leakage hole. The second end of the oil guide tube 104 is located within the oil conservator body 103 and extends away from the first end, ensuring that at least two ends of the oil guide tube 104 are not on the same plane when the capacitive sleeve is placed horizontally. The second end of the oil guide tube 104 is also located within the oil conservator body 103 to maintain communication between the second end of the oil guide tube 104 and the oil conservator body 103.

[0043] When the oil conservator body 103 is arranged vertically, any position of the oil guide pipe 104 is below the transformer oil level inside the oil conservator body 103. That is, the fluctuation of each position of the oil guide pipe 104 in the axial direction along the central conductive pipe 106 should not be too large. If the second end of the oil guide pipe 104 extends upward along the axial direction of the central conductive pipe 106 by too large a distance, it may extend beyond the transformer oil level inside the oil conservator body 103.

[0044] The oil conservator body 103 is vertically arranged, meaning the axis of the central conductive tube 106 is vertical. During normal operation of the capacitive bushing, the axis of the central conductive tube 106 is nearly vertical. Therefore, as long as the oil conservator body 103 is vertically arranged and the oil guide tube 104 is below the transformer oil level, the oil guide tube 104 will also be below the transformer oil level during normal operation of the capacitive bushing. The vertical arrangement of the oil conservator body 103 can be understood as the state in which the capacitive bushing is installed in the transformer and is in operation.

[0045] When the oil conservator body 103 is arranged horizontally, the vertical height of at least one position of the oil guide pipe 104 is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain component. The oil guide pipe 104 is arranged as close as possible to the inner wall of the oil conservator body 103, that is, away from the direction of the central conductive pipe 106, so that the distance between the axis of the oil guide pipe 104 and the central conductive pipe 106 is greater, making it easier to maintain it above the highest position of the transformer oil cavity of the outer insulating porcelain component.

[0046] The present invention provides an oil conservator for a capacitor bushing, wherein an oil guide pipe 104 is added inside the oil conservator body 103. The first end of the oil guide pipe 104 is sealed and connected to the oil leakage hole, and the second end extends away from the first end of the oil guide pipe 104. When the oil conservator body 103 is arranged vertically, any position of the oil guide pipe 104 is below the transformer oil level inside the oil conservator body 103, so that the oil conservator body 103 is in communication with the transformer oil cavity of the outer insulating porcelain. The transformer oil in the transformer oil cavity of the outer insulating porcelain can enter the oil guide pipe 104 through the oil leakage hole and flow into the oil conservator body 103 through the second end of the oil guide pipe 104.

[0047] Correspondingly, the transformer oil in the oil conservator body 103 can enter the oil guide pipe 104 through the second end of the oil guide pipe 104, and flow into the transformer oil cavity of the outer insulating porcelain through the oil leakage hole through the first end of the oil guide pipe 104, realizing free flow between the oil conservator body 103 and the transformer oil cavity of the outer insulating porcelain, so as to replenish the transformer oil cavity of the outer insulating porcelain through the oil conservator body 103, and make the transformer oil circulate through the oil guide pipe 104, so that the capacitor core is completely immersed in the transformer oil during normal use.

[0048] When the oil conservator body 103 is arranged horizontally, the vertical height of at least one position of the oil guide pipe 104 is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain component. This ensures that the oil conservator body 103 and the transformer oil cavity of the outer insulating porcelain component are in a cut-off state. The transformer oil in the transformer oil cavity of the outer insulating porcelain component cannot flow into the oil conservator body 103 through the oil guide pipe 104, ensuring that there is sufficient transformer oil in the transformer oil cavity of the outer insulating porcelain component. This prevents the capacitor core from being exposed outside the transformer oil due to transformer oil loss. When the capacitive bushing is stored for a long time, there is no need to raise the head of the capacitive bushing, which also prevents the transformer oil in the outer insulating porcelain component from flowing into the oil conservator and avoids the capacitor core from being exposed, thus reducing the maintenance difficulty of the capacitive bushing.

[0049] To ensure that the oil conservator body 103 is horizontally arranged, the oil guide pipe 104 can more easily separate the transformer oil cavity of the external insulating porcelain and the oil conservator body 103. In a specific embodiment of the present invention, the oil guide pipe 104 is arranged around the inner wall of the oil conservator body 103, and at least around half a circumference of the inner wall of the oil conservator body 103. The oil guide pipe 104 is arranged around the inner wall of the oil conservator body 103 for half a circumference, so that the line connecting the first end and the second end of the oil guide pipe 104 passes through the axis of the central conductive pipe 106 (that is, the first end and the second end of the oil guide pipe 104 are respectively located at a position symmetrical about the axis of the central conductive pipe 106).

[0050] If the oil conservator body 103 is a cylindrical structure, then the line connecting the first and second ends of the oil guide pipe 104 passes through the axis of the oil conservator body 103. In this embodiment, by having the oil guide pipe 104 encircle at least half a circumference along the inner wall of the oil conservator body 103, when the oil conservator body 103 is arranged horizontally, any position near the ground ensures that the vertical height of at least one position of the oil guide pipe 104 is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain component. This eliminates any requirements on the horizontal placement of the oil conservator body 103, reducing the difficulty of placement. It should be noted that the oil guide pipe 104 encircles the inner wall of the oil conservator body 103 for one full circumference, or between half a circumference and one full circumference.

[0051] Normally, the oil tank body 103 is equipped with an oil level gauge 105 for detecting the transformer oil level inside the oil tank body 103. The oil level gauge 105 detects the transformer oil level so that when the transformer oil in the oil tank body 103 decreases to a certain level, it can remind maintenance personnel to add transformer oil.

[0052] In the first direction, the oil guide pipe 104 is positioned closer to the bottom plate of the oil conservator body 103 than the oil level gauge 105. The first direction is the axial direction of the central conductive pipe 106. The oil level gauge 105 is positioned at the lowest limit liquid level in the oil conservator body 103 when the capacitive bushing is arranged vertically. In this embodiment, by setting the oil guide pipe 104 below the oil level gauge 105 (when the capacitive bushing is arranged vertically), that is, when the capacitive bushing is in operation, the oil guide pipe 104 can always be located below the transformer oil level. This ensures that as long as the transformer oil in the oil conservator body 103 is above the lowest limit liquid level, it can flow into the transformer oil cavity of the outer insulating ceramic component through the oil guide pipe 104.

[0053] Since the oil guide pipe 104 needs to be sealed and connected to the oil leakage hole, in this embodiment, the oil leakage hole is designed as a threaded hole to facilitate the installation of the oil guide pipe 104. The first end of the oil guide pipe 104 is installed in the threaded hole through a threaded sealing joint 109. The threaded sealing joint 109 can be threaded into the threaded hole to achieve a sealed connection between the oil guide pipe 104 and the oil leakage hole. Moreover, the threaded connection makes it easier to achieve a seal, preventing transformer oil from bypassing the oil guide pipe 104 and instead flowing through the oil leakage hole.

[0054] In this embodiment, the oil leakage hole is a threaded hole of M10 to M14, and the oil guide tube 104 is made of copper with an inner diameter of φ8mm to φ12mm and a wall thickness of 0.8mm to 1.2mm. Further, in a specific embodiment, the oil leakage hole is a threaded hole of M12, the oil guide tube 104 has an inner diameter of φ10mm, a wall thickness of 1mm, and a length of 700mm. It should be noted that the inner diameter, wall thickness, and length of the oil guide tube 104 can be adjusted according to actual needs and the dimensions of the oil conservator body 103, and are not limited to the specific dimensions disclosed in the above embodiments.

[0055] like Figure 3 and Figure 4 As shown, in a specific embodiment of the present invention, the oil guide pipe 104 includes a vertical section communicating with the threaded sealing joint 109 and a surrounding section communicating with the vertical section. The vertical section extends from the bottom plate of the oil conservator body 103 to the end away from the bottom plate. The bottom plate of the oil conservator body 103 is the end plate of the oil conservator body 103 near the outer insulating ceramic part. The surrounding section is arranged around the inner wall of the oil conservator body 103. The surrounding section can be an arc structure or other forms of surrounding structure, as long as the surrounding section is arranged as close as possible to the inner wall of the oil conservator body 103.

[0056] The vertical section increases the height of the oil guide pipe 104 to raise the distance between the winding section and the threaded sealing joint 109, preventing the winding section from being too close to the threaded sealing joint 109 during installation, which would affect the installation of the threaded sealing joint 109. The winding section also increases the distance between the oil guide pipe 104 and the central conductive pipe 106, ensuring that when the capacitor bushing is placed horizontally, the oil tank body 103 and the transformer oil cavity of the outer insulating porcelain are in a cut-off state, preventing the transformer oil in the transformer oil cavity of the outer insulating porcelain from flowing into the oil tank body 103 through the oil guide pipe 104.

[0057] The surrounding sections are located at the same position along the first direction, which is the axial direction of the central conductive tube 106. That is, when the capacitive bushing is arranged vertically, the surrounding sections are located at the same height. It should be noted that the position of the surrounding sections can also be tilted at a certain angle from the axial direction of the central conductive tube 106, as long as all positions of the surrounding sections are below the oil level gauge 105.

[0058] This invention also discloses a capacitive bushing, including an outer insulating ceramic component, an oil conservator, a central conductive tube 106, and a spring assembly 102. The central conductive tube 106 is disposed within the oil conservator, and the spring assembly 102 is disposed within the oil conservator but located outside the central conductive tube 106. One end of the central conductive tube 106 extends out of the oil conservator, and the other end extends into the outer insulating ceramic component. A sealing joint 101 is connected to the end of the central conductive tube 106 extending out of the oil conservator. The spring assembly 102, under the action of its spring, drives the central conductive tube 106 to remain inserted into the sealing joint 101. The key point of this invention is that the oil conservator is the capacitive bushing oil conservator disclosed in the above embodiment, and the oil guide tube 104 is located on the side of the spring assembly 102 away from the central conductive tube 106, that is, the oil guide tube 104 is located outside the spring assembly 102, and also between the spring assembly 102 and the inner wall of the oil conservator body 103.

[0059] The capacitive bushing provided by the present invention has all the technical effects of the aforementioned capacitive bushing oil conservator, which will not be repeated here.

[0060] like Figure 1 and Figure 2 As shown, the oil conservator body 103 has an installation opening at the end away from the base plate. One end of the central conductive tube 106 extends out of the oil conservator through the installation opening. The sealing joint 101 is installed at the installation opening using a double-pressure cap, and the end of the central conductive tube 106 extending out of the installation opening is connected to the sealing joint 101. In this embodiment, a double-pressure cap sealing structure is used to seal the installation opening, which provides a better sealing effect than a single-pressure cap sealing structure, thus preventing transformer oil leakage.

[0061] In a specific embodiment of the present invention, the double pressure cap includes a first pressure cap 107 and a second pressure cap 108. The first pressure cap 107 has a central region and an edge region located outside the central region. The central region has a recessed platform that is recessed into the installation opening, such that a groove is formed on the side of the platform facing the sealing joint 101.

[0062] The platform has a first cap hole for the central conductive tube 106 to extend from. The edge area is fixed to the oil tank body 103 by fasteners to seal the installation opening through the first cap 107. In order to ensure that the first cap 107 is sealed with the central conductive tube 106 and the oil tank body 103, the edge area of ​​the first cap 107 and the oil tank body 103, as well as the first cap hole of the first cap 107 and the central conductive tube 106, are sealed with sealing elements. The sealing joint 101 is fixed to the edge area of ​​the first cap 107 by fasteners.

[0063] The countersunk platform is lowered towards the installation opening to form a recess on the side of the countersunk platform facing the sealing joint 101. The second pressure cap 108 is fixed in the recess by fasteners. The second pressure cap 108 has a second pressure cap hole for the central conductive tube 106 to extend out. The second pressure cap 108 and the first pressure cap 107, as well as the second pressure cap hole and the central conductive tube 106, are sealed by sealing elements. In this embodiment, the sealing effect between the pressure cap and the central conductive tube 106 is improved by adding the second pressure cap 108, and the second pressure cap 108 is placed in the recess formed by the countersunk platform without increasing the volume of the capacitor sleeve.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0066] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0067] Hereinafter, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0068] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A capacitive bushing oil pillow characterized by, include: The oil conservator body (103) has a central conductive tube (106) of the capacitive bushing penetrating through it. The bottom plate of the oil conservator body (103) has an oil leakage hole for connecting the transformer oil cavity of the outer insulating porcelain of the capacitive bushing. The bottom plate of the oil conservator body (103) is the end plate of the oil conservator body (103) near the outer insulating porcelain. The oil guide pipe (104) has a first end sealed and connected to the oil leakage hole, and a second end connected to the oil conservator body (103), extending away from the first end of the oil guide pipe (104). When the oil conservator body (103) is arranged vertically, any position of the oil guide pipe (104) is below the transformer oil level in the oil conservator body (103). When the oil conservator body (103) is arranged horizontally, the vertical height of at least one position of the oil guide pipe (104) is higher than the vertical height of the highest position of the transformer oil cavity of the outer insulating porcelain.

2. The capacitive oil pillow for bushings according to claim 1, characterized in that, The oil guide pipe (104) is arranged around the inner wall of the oil conservator body (103), and at least around half of the inner wall of the oil conservator body (103).

3. The capacitive oil pillow for bushings according to claim 2, characterized in that, The oil tank body (103) is equipped with an oil level gauge (105) for detecting the transformer oil level inside the oil tank body (103); In the first direction, each position of the oil guide pipe (104) is arranged closer to the bottom plate of the oil conservator body (103) than the oil level gauge (105), and the first direction is the axial direction of the central conductive pipe (106).

4. The capacitance type oil pillow for bushings according to claim 2, characterized by The first and second ends of the oil guide tube (104) are located at positions symmetrically aligned with the axis of the central conductive tube (106).

5. The capacitive oil pillow for bushings according to any of claims 1-4, characterized in that, The oil leakage hole is a threaded hole, and the first end of the oil guide pipe (104) is installed at the threaded hole through a threaded sealing joint (109).

6. The capacitance type oil pillow for bushings according to claim 5, characterized by The oil guide tube (104) includes a vertical section communicating with the threaded sealing joint (109) and a circumferential section communicating with the vertical section. The vertical section extends from the bottom plate of the oil conservator body (103) to the end away from the bottom plate. The bottom plate of the oil conservator body (103) is the end plate of the oil conservator body (103) near the outer insulating ceramic piece. The surrounding section is arranged around the inner wall of the oil pillow body (103).

7. The capacitance type oil pillow for bushings according to claim 6, characterized by The surrounding segments are located at the same position along a first direction, which is the axial direction of the central conductive tube (106).

8. The capacitive oil pillow for bushings according to any of claims 1-4, characterized in that, The oil guide tube (104) is made of copper, with an inner diameter of φ8mm~φ12mm and a wall thickness of 0.8mm~1.2mm.

9. A capacitor bushing comprising an outer insulating porcelain, an oil pot, a central electrically conductive tube (106) arranged in the oil pot, and a spring assembly (102) arranged in the oil pot outside the central electrically conductive tube (106), one end of the central electrically conductive tube (106) extending outside the oil pot and the other end extending into the outer insulating porcelain, a sealing joint (101) being connected to the end of the central electrically conductive tube (106) extending outside the oil pot, characterized in that The oil conservator is a capacitive bushing oil conservator as described in any one of claims 1-8, and the oil guide tube (104) is located on the side of the spring assembly (102) away from the central conductive tube (106).

10. The capacitive bushing according to claim 9, characterized in that, The oil conservator body (103) has an installation opening at one end away from the base plate. One end of the central conductive tube (106) extends out of the oil conservator through the installation opening. The sealing joint (101) is sealed and installed at the installation opening by a double pressure cap.

11. The capacitive bushing according to claim 10, characterized in that, The double pressure cap includes: The first pressure cap (107) has a central region and an edge region located outside the central region. The central region has a recessed platform that sinks into the mounting opening. The recessed platform has a first pressure cap hole for the central conductive tube (106) to extend out. The edge region is fixed to the oil tank body (103) by fasteners. The edge region and the oil tank body (103) are sealed by seals, as are the first pressure cap hole and the central conductive tube (106). The sealing joint (101) is fixed to the edge region of the first pressure cap (107) by fasteners. The second pressure cap (108) is recessed in the direction of the mounting opening to form a groove on the side of the recess facing the sealing joint (101). The second pressure cap (108) is fixed in the groove by fasteners. The second pressure cap (108) has a second pressure cap hole for the central conductive tube (106) to extend out. The second pressure cap (108) and the first pressure cap (107) are sealed by a sealing element. The second pressure cap (108) and the central conductive tube (106) are sealed by a sealing element.

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