Double-tap shock-resistant transformer bushing

Abstract

The transformer bushing comprises an oil conservator, an upper insulating sleeve, a capacitor core, a connecting sleeve, a lower insulating sleeve and an elastic component, the oil conservator, the upper insulating sleeve, the connecting sleeve and the lower insulating sleeve are sequentially connected in a sealed mode, and a capacitor plate on the outermost layer of a capacitor screen of the capacitor core is a grounding end screen. A first end of a current-carrying tube of the capacitor core extends out from one end, far away from the upper insulating sleeve, of the oil conservator, a second end of the current-carrying tube extends out from one end, far away from the connecting sleeve, of the lower insulating sleeve, and the connecting sleeve is provided with a first tap electrically connected with the grounding end screen and a second tap electrically connected with another capacitor plate except the grounding end screen. The elastic component is located in the oil conservator and arranged between the current carrying pipe and the oil conservator. The double-tap anti-seismic transformer bushing can be grounded and connected with on-line monitoring equipment at the same time, the problem that the transformer bushing is damaged or a transformer breaks down due to abnormal conditions such as poor grounding can be avoided, and the double-tap anti-seismic transformer bushing has high anti-seismic strength.

Description

Technical Field

[0001] The invention relates to the technical field of power electrical equipment, and in particular to a double-tap anti-seismic transformer bushing. Background Art

[0002] As an important component of transformer equipment, transformer bushing failure has become the main cause of transformer equipment and power outage failure. Improving the seismic resistance of transformer bushings and online monitoring of bushing insulation performance can reduce and prevent abnormal operation.

[0003] At present, most transformer bushings have only one test tap. After the online monitoring equipment is installed, abnormalities such as poor grounding often occur, resulting in transformer bushing damage or transformer failure. Summary of the invention

[0004] The object of the present invention is to provide a double-tap seismic transformer bushing to improve its operating reliability after installing an online monitoring device.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A double-tap anti-seismic transformer bushing, comprising an oil pillow, an upper insulating sleeve, a capacitor core, a connecting sleeve, a lower insulating sleeve and an elastic member, wherein the oil pillow, the upper insulating sleeve, the connecting sleeve and the lower insulating sleeve are sealed and connected in sequence, the capacitor core comprises a current-carrying tube and a multi-layer insulating layer and a multi-layer capacitor screen wrapped outside the current-carrying tube, the capacitor screen is composed of a plurality of layers of coaxial capacitor plates of different lengths, the capacitor plates and the insulating layers are alternately wound and arranged at intervals, the capacitor plates of the outermost layer of the capacitor screen are grounded end screens, the first end of the current-carrying tube extends from an end of the oil pillow away from the upper insulating sleeve, the The second end extends out from one end of the lower insulating sleeve away from the connecting sleeve, and the current-carrying tube is sealed with the oil pillow and the lower insulating sleeve. The connecting sleeve is provided with a first tap and a second tap. The first tap is electrically connected to the grounding end screen, and the second tap is electrically connected to another capacitor plate other than the grounding end screen. The elastic member is located in the oil pillow and is arranged between the current-carrying tube and the oil pillow, so that the second end of the current-carrying tube has a tendency to move toward the oil pillow, thereby pressing the oil pillow, the upper insulating sleeve, the capacitor core, the connecting sleeve and the lower insulating sleeve.

[0007] In one embodiment of the present application, the elastic component includes a compression spring and a mounting seat, the mounting seat is provided on the portion of the current-carrying tube located inside the oil pillow, one end of the compression spring is installed on the mounting seat, and the other end is provided on the inner end surface of one end of the oil pillow connected to the upper insulating sleeve.

[0008] In one embodiment of the present application, the elastic component also includes a guide rod, one end of which is fixedly arranged on the inner end surface of one end of the oil pillow connected to the upper insulating sleeve, the other end of the guide rod is slidably matched with the mounting seat, and the compression spring is sleeved on the guide rod.

[0009] In one embodiment of the present application, the second tap is electrically connected to the capacitor plate of the third layer from the outside to the inside.

[0010] In one embodiment of the present application, the upper insulating sleeve is connected to the oil pillow via a first glue-mounted flange structure, and the upper insulating sleeve is connected to the connecting sleeve via a second glue-mounted flange structure.

[0011] In one embodiment of the present application, the second end of the current-carrying tube is sealingly connected to the lower insulating sleeve via a base, the base is threadedly connected to the second end of the current-carrying tube, a first sealing ring is arranged between the base and an end surface of the lower insulating sleeve away from the connecting sleeve, and the base is tightened relative to the current-carrying tube until the first sealing ring is pressed against the end surface of the lower insulating sleeve away from the connecting sleeve.

[0012] In one embodiment of the present application, the second end of the current-carrying tube passes through the base and is threadedly connected to the lower terminal, and the lower terminal is tightened relative to the current-carrying tube until the second sealing ring is pressed against the base.

[0013] In one embodiment of the present application, the lower terminal cover is provided with a pressure equalizing ball.

[0014] In one embodiment of the present application, the first end of the current-carrying tube is connected to the upper terminal through an end seat, the end seat cover is arranged outside the first end of the current-carrying tube, the end seat is connected to an end of the oil pillow away from the upper insulating sleeve, and a third sealing ring arranged around the current-carrying tube is arranged between the end seat and the oil pillow.

[0015] In one embodiment of the present application, a fourth sealing ring is provided between the end seat and the circumferential tube wall of the current-carrying tube.

[0016] It can be seen from the above technical scheme that the present invention discloses a double-tap anti-seismic transformer bushing, which includes an oil pillow, an upper insulating sleeve, a capacitor core, a connecting sleeve, a lower insulating sleeve and an elastic member, wherein the oil pillow, the upper insulating sleeve, the connecting sleeve and the lower insulating sleeve are sealed and connected in sequence, the capacitor core includes a current-carrying tube and a multi-layer insulating layer and a multi-layer capacitor screen wrapped outside the current-carrying tube, the capacitor screen is composed of a plurality of layers of coaxial capacitor plates of different lengths, the capacitor plates and the insulating layers are alternately wound and arranged at intervals, the outermost capacitor plate of the capacitor screen is a grounded end screen, and the current-carrying The first end of the tube extends from one end of the oil pillow away from the upper insulating sleeve, the second end of the current-carrying tube extends from one end of the lower insulating sleeve away from the connecting sleeve, and the current-carrying tube is sealed with the oil pillow and the lower insulating sleeve. The connecting sleeve is provided with a first tap and a second tap, the first tap is electrically connected to the grounding end screen, and the second tap is electrically connected to another capacitor plate other than the grounding end screen. The elastic component is located in the oil pillow and is arranged between the current-carrying tube and the oil pillow, so that the second end of the current-carrying tube has a tendency to move toward the oil pillow, thereby pressing the oil pillow, the upper insulating sleeve, the capacitor core, the connecting sleeve and the lower insulating sleeve.

[0017] It can be seen that the connecting sleeve of the double-tap seismic-resistant transformer bushing is provided with a first tap and a second tap, wherein the first tap is electrically connected to the grounding end screen to ensure that the double-tap seismic-resistant transformer bushing is always grounded, and the second tap is electrically connected to another capacitor plate other than the grounding end screen, so that the double-tap seismic-resistant transformer bushing can be connected to the online monitoring equipment while being grounded, thereby ensuring that after the online monitoring equipment is installed, there will be no damage to the transformer bushing or transformer failure caused by abnormalities such as poor grounding, and the elastic force of the elastic component can be relied on to tighten the various parts of the bushing to ensure that the sealing of the transformer bushing is intact under the preset earthquake intensity conditions, thereby improving the seismic strength of the double-tap seismic-resistant transformer bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A half-section schematic diagram of a double-tap seismic transformer bushing provided in an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a connecting sleeve of a double-tap seismic transformer bushing provided in an embodiment of the present invention;

[0021] Figure 3 for Figure 1A-direction sectional view;

[0022] Figure 4 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0023] Figure 5 for Figure 1 A partial enlarged schematic diagram of point C in the middle;

[0024] Figure 6 A schematic structural diagram of an upper insulating sleeve of a double-tap seismic-resistant transformer bushing provided in an embodiment of the present invention.

[0025] In the figure:

[0026] 1 is an oil pillow; 2 is an upper insulating sleeve; 201 is an insulating sleeve body; 202 is a first glue-mounted flange; 203 is a second glue-mounted flange; 3 is a capacitor core; 301 is a current-carrying tube; 302 is a capacitor screen; 4 is a connecting sleeve; 5 is a lower insulating sleeve; 6 is an upper terminal; 7 is a lower terminal; 8 is an elastic member; 801 is a compression spring; 802 is a mounting seat; 803 is a guide rod; 9 is a pressure-equalizing ball; 10 is a first tap; 11 is a second tap; 12 is a base; 13 is an end seat. DETAILED DESCRIPTION

[0027] The core of the present invention is to provide a double-tap seismic-resistant transformer bushing, the structural design of which enables it to improve its operating reliability after installing online monitoring equipment.

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 3 , Figure 1 A half-section schematic diagram of a double-tap seismic transformer bushing provided in an embodiment of the present invention, Figure 2 A schematic diagram of the structure of a connecting sleeve of a double-tap seismic transformer bushing provided in an embodiment of the present invention, Figure 3 for Figure 1 A-axis section view.

[0030] In an embodiment of the present invention, a double-tap anti-seismic transformer bushing is disclosed. The double-tap anti-seismic transformer bushing is used to be arranged on a transformer (not shown in the figure), specifically fixed on the shell of the transformer, one end of which extends out of the outside of the transformer and the other end extends into the inside of the transformer, and is used to guide the current in the transformer to an external conductor such as a cable, or to guide the current in an external conductor such as a cable to the transformer. In this application, Figures 1 to 3 As shown, the double-tap anti-seismic transformer bushing includes an oil pillow 1, an upper insulating sleeve 2, a capacitor core 3, a connecting sleeve 4, a lower insulating sleeve 5 and an elastic member 8.

[0031] Among them, the oil pillow 1, the upper insulating sleeve 2, the connecting sleeve 4 and the lower insulating sleeve 5 are sealed and connected in sequence. The oil pillow 1 is used to store insulating oil. When the volume of the insulating oil in the upper insulating sleeve 2 expands or shrinks with the temperature and operating conditions, the oil pillow 1 can play a role in regulating the amount of oil, that is, when the volume of the insulating oil in the upper insulating sleeve 2 expands, the insulating oil in the outer insulating tube flows upward into the oil pillow 1. When the volume of the insulating oil in the upper insulating sleeve 2 shrinks, the insulating oil in the oil pillow 1 flows to the outer insulating tube, thereby playing a role in replenishing oil.

[0032] The upper insulating sleeve 2 and the lower insulating sleeve 5 are hollow structures. In the present application, the upper insulating sleeve 2 and the lower insulating sleeve 5 are made of ceramic or composite materials.

[0033] The capacitor core 3 is inserted into the oil pillow 1, the upper insulating sleeve 2, the connecting sleeve 4 and the lower insulating sleeve 5. The capacitor core 3 includes a current-carrying tube 301 and a multi-layer insulating layer and a multi-layer capacitor screen 302 wrapped outside the current-carrying tube 301. The current-carrying tube 301 is used to transmit current between external conductors such as transformers and cables, that is, to carry current. The current-carrying tube 301 is a hollow tube. The capacitor screen 302 is composed of several layers of coaxial capacitor plates of different lengths. The capacitor plates and the insulating layers are alternately wound and arranged at intervals. The outermost capacitor plate of the capacitor screen 302 is a grounded end screen. The first end of the current-carrying tube 301 extends from one end of the oil pillow 1 away from the upper insulating sleeve 2, and the second end of the current-carrying tube 301 extends from one end of the lower insulating sleeve 5 away from the connecting sleeve 4, and the current-carrying tube 3 is sealed with the oil pillow 1 and the lower insulating sleeve 5.

[0034] The connecting sleeve 4 is provided with a first tap 10 and a second tap 11. The first tap 10 is electrically connected to the grounding end screen, and the second tap 11 is electrically connected to another capacitor plate other than the grounding end screen. Two tap fixing seats are provided on the connecting sleeve 4, and tap lead holes are provided on the grounding end screen and another capacitor plate, respectively. The two tap lead holes are electrically connected to the two tap fixing seats, and the first tap 10 and the second tap 1 are respectively installed on the two tap fixing seats.

[0035] The elastic component 8 is located in the oil pillow 1 and is arranged between the current-carrying tube 301 and the oil pillow 1, so that the second end of the current-carrying tube 301 has a tendency to move toward the oil pillow 1, and the oil pillow 1, the upper insulating sleeve 2, the capacitor core 3, the connecting sleeve 4 and the lower insulating sleeve 5 are compressed. The elastic component 8 includes but is not limited to a leaf spring, a disc spring, and a compression spring.

[0036] Compared with the prior art, the connecting sleeve 4 of the double-tap seismic-resistant transformer bushing provided in the embodiment of the present invention is provided with a first tap 10 and a second tap 11, wherein the first tap 10 is electrically connected to the grounding end screen to ensure that the double-tap seismic-resistant transformer bushing is always grounded, and the second tap 11 is electrically connected to another capacitor plate other than the grounding end screen, so that the double-tap seismic-resistant transformer bushing can be connected to the online monitoring equipment while being grounded, thereby ensuring that after the online monitoring equipment is installed, the transformer bushing is not damaged or the transformer fails due to abnormalities such as poor grounding, and the elastic force of the elastic member 8 can be relied on to tighten the various parts of the bushing to ensure that the sealing of the transformer bushing is intact under the preset seismic intensity, thereby improving the seismic strength of the double-tap seismic-resistant transformer bushing, and reducing various abnormal conditions such as insulation sleeve breakage, cracking, seal damage and oil leakage caused by earthquakes.

[0037] To facilitate the installation of the elastic member 8, in one embodiment of the present application, Figure 1 and Figure 5 As shown, the elastic member 8 includes a compression spring 801 and a mounting seat 802. The mounting seat 802 is provided on the portion of the current-carrying tube 301 located inside the oil pillow 1. A plurality of compression springs 801 are evenly distributed circumferentially around the current-carrying tube 301, and one end of the compression spring 801 is installed on the mounting seat 802, and the other end is provided on the inner end surface of one end of the oil pillow 1 connected to the upper insulating sleeve 2.

[0038] To further optimize the above technical solution, in one embodiment of the present application, Figure 5 As shown, the elastic component 8 also includes a guide rod 803, one end of which is fixedly arranged on the inner end surface of one end of the oil pillow 1 connected to the upper insulating sleeve 2, and the other end of the guide rod 803 is slidably matched with the mounting seat 802, and the compression spring 801 is sleeved on the guide rod 803, and the guide rod 803 can guide and limit the reciprocating movement of the compression spring 801 and the mounting seat 802.

[0039] To further optimize the above technical solution, in one embodiment of the present application, the second tap 11 is electrically connected to the third layer of capacitor plates from the outside to the inside, that is, a tap lead hole is set on the third layer of capacitor plates from the outside to the inside.

[0040] In order to further improve the seismic resistance of the double-tap seismic transformer bushing, in one embodiment of the present application, the upper insulating sleeve 2 is connected to the oil pillow 1 through a first glue-fitting flange structure, and the upper insulating sleeve 2 is connected to the connecting sleeve 4 through a second glue-fitting flange structure. Figure 1 and Figure 6 As shown, in the present case, the upper insulating sleeve 2 includes an insulating sleeve body 201 and a first glued flange 202 and a second glued flange 203 respectively arranged at both ends of the insulating sleeve body 201, a first flange structure corresponding to the first glued flange 202 is arranged on the oil pillow 1, and a second flange structure corresponding to the second glued flange 203 is arranged on the connecting sleeve 4, the first glued flange 202 and the first flange structure as well as the second glued flange 203 and the second flange structure are mechanically connected by bolts, the glued flange structure has a large glue ratio and high mechanical strength, which can further improve the seismic performance of the double-tap seismic-resistant transformer bushing.

[0041] In order to achieve a sealed connection between the second end of the current-carrying tube 301 and the lower insulating sleeve 5, in one embodiment of the present application, as shown in FIG. Figure 4 As shown, the second end of the current-carrying tube 301 is sealed and connected with the lower insulating sleeve 5 through the base 12, and the base 12 is threadedly connected to the second end of the current-carrying tube 301. A first sealing ring is arranged between the base 12 and the end face of the lower insulating sleeve 5 away from the connecting sleeve 4. The base 12 is tightened relative to the current-carrying tube 301 until the first sealing ring is pressed against the end face of the lower insulating sleeve 5 away from the connecting sleeve 4. In this way, the threaded matching structure between the base 12 and the current-carrying tube 301 can realize the sealing between the base 12 and the current-carrying tube 301, and the first sealing ring between the base 12 and the end face of the lower insulating sleeve 5 away from the connecting sleeve 4 can realize the sealing between the base 12 and the lower insulating sleeve 5, thereby sealing the gap formed by the current-carrying tube 301 extending out of the lower insulating sleeve 5.

[0042] To further optimize the above technical solution, in one embodiment of the present application, the second end of the current-carrying tube 301 passes through the base 12 and is threadedly connected to the lower terminal 7 , and the lower terminal 7 is tightened relative to the current-carrying tube 301 until the second sealing ring is pressed against the base 12 .

[0043] like Figure 1 and Figure 4 As shown, the outer cover of the lower terminal 7 is provided with a voltage equalizing ball 9. The voltage equalizing ball 9 can optimize the electric field distribution and reduce the occurrence of local high voltage areas through its specific shape and material properties, thereby protecting the equipment from damage, reducing the risk of tip discharge, and enhancing the insulation strength of the equipment to prevent insulation breakdown accidents caused by uneven voltage distribution.

[0044] like Figure 1 and Figure 5As shown, in one embodiment of the present application, the first end of the current-carrying tube 301 is connected to the upper terminal 6 through the end seat 13, the end seat 13 is covered outside the first end of the current-carrying tube 301, the end seat 13 is connected to the end of the oil pillow 1 away from the upper insulating sleeve 2, and a third sealing ring arranged around the current-carrying tube 301 is arranged between the end seat 13 and the oil pillow 1. The third sealing ring can seal the gap between the end seat 13 and the oil pillow 1, and form an annular seal around the current-carrying tube 301 to avoid the risk of leakage between the end seat 13 and the oil pillow 1.

[0045] To further optimize the above technical solution, in one embodiment of the present application, Figure 5 As shown, a fourth sealing ring is arranged between the end seat and the circumferential tube wall of the current-carrying tube to further improve the sealing performance and eliminate the risk of leakage.

[0046] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0047] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-tap seismic transformer bushing, characterized in that: The invention comprises an oil pillow (1), an upper insulating sleeve (2), a capacitor core (3), a connecting sleeve (4), a lower insulating sleeve (5) and an elastic member (8), wherein the oil pillow (1), the upper insulating sleeve (2), the connecting sleeve (4) and the lower insulating sleeve (5) are sealed and connected in sequence, the capacitor core (3) comprises a current-carrying tube (301) and a multi-layer insulating layer and a multi-layer capacitor screen (302) wrapped outside the current-carrying tube (301), the capacitor screen (302) comprises a plurality of layers of capacitor plates of different lengths and coaxial, the capacitor plates and the insulating layers are alternately wound and arranged at intervals, the capacitor plates of the outermost layer of the capacitor screen (302) are grounded end screens, the first end of the current-carrying tube (301) extends from one end of the oil pillow (1) away from the upper insulating sleeve (2), and the second end of the current-carrying tube (301) extends from the The lower insulating sleeve (5) extends out from one end away from the connecting sleeve (4), and the current-carrying tube (301) is sealed with the oil pillow (1) and the lower insulating sleeve (5). The connecting sleeve (4) is provided with a first tap (6) and a second tap (7). The first tap (6) is electrically connected to the grounding end screen, and the second tap (7) is electrically connected to another capacitor plate other than the grounding end screen. The elastic member (8) is located in the oil pillow (1) and is arranged between the current-carrying tube (301) and the oil pillow (1), so that the second end of the current-carrying tube (301) has a tendency to move toward the oil pillow (1), thereby pressing the oil pillow (1), the upper insulating sleeve (2), the capacitor core (3), the connecting sleeve (4) and the lower insulating sleeve (5).

2. The double-tap seismic transformer bushing according to claim 1, characterized in that: The elastic component (8) comprises a compression spring (801) and a mounting seat (802); the mounting seat (802) is provided on the portion of the current-carrying tube (301) located inside the oil pillow (1); one end of the compression spring is mounted on the mounting seat (802), and the other end is provided on the inner end surface of one end of the oil pillow (1) connected to the upper insulating sleeve (2).

3. The double-tap seismic transformer bushing according to claim 2, characterized in that: The elastic component (8) further comprises a guide rod (803), one end of the guide rod (803) being fixedly arranged on the inner end surface of one end of the oil pillow (1) connected to the upper insulating sleeve (2), the other end of the guide rod (803) being slidably matched with the mounting seat (802), and the compression spring (801) being sleeved on the guide rod (803).

4. The double-tap seismic transformer bushing according to any one of claims 1 to 3, characterized in that: The second tap (7) is electrically connected to the capacitor plate of the third layer from the outside to the inside.

5. The double-tap seismic transformer bushing according to any one of claims 1 to 3, characterized in that: The upper insulating sleeve (2) is connected to the oil pillow (1) via a first glue-fitting flange structure, and the upper insulating sleeve (2) is connected to the connecting sleeve (4) via a second glue-fitting flange structure.

6. The double-tap seismic transformer bushing according to any one of claims 1 to 3, characterized in that: The second end of the current-carrying tube (301) is connected to the lower insulating sleeve (5) in a sealing manner via a base (12); the base (12) is threadedly connected to the second end of the current-carrying tube (301); a first sealing ring is arranged between the base (12) and an end surface of the lower insulating sleeve (5) away from the connecting sleeve (4); the base (12) is screwed relative to the current-carrying tube (301) until the first sealing ring is pressed against an end surface of the lower insulating sleeve (5) away from the connecting sleeve (4).

7. The double-tap seismic transformer bushing according to claim 6, characterized in that: The second end of the current-carrying tube (301) passes through the base (12) and is threadedly connected to the lower terminal (7); the lower terminal (7) is screwed relative to the current-carrying tube (301) until the second sealing ring is pressed against the base (12).

8. The double-tap seismic transformer bushing according to claim 7, characterized in that: The outer cover of the lower wiring terminal (7) is provided with a pressure equalizing ball (9).

9. The double-tap seismic transformer bushing according to any one of claims 1 to 3, characterized in that: The first end of the current-carrying tube (301) is connected to the upper wiring terminal (6) via an end seat (13); the end seat (13) is arranged outside the first end of the current-carrying tube (301); the end seat (13) is connected to an end of the oil pillow (1) away from the upper insulating sleeve (2); and a third sealing ring is arranged between the end seat (13) and the oil pillow (1) and surrounds the current-carrying tube (301).

10. The double-tap seismic transformer bushing according to claim 9, characterized in that: A fourth sealing ring is provided between the end seat (13) and the circumferential tube wall of the current-carrying tube (301).

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