A double-tap anti-seismic transformer bushing

Abstract

This invention relates to a double-tap seismic-resistant transformer bushing. The bushing includes an oil conservator, an upper insulating sleeve, a capacitor core, a connecting sleeve, a lower insulating sleeve, and an elastic component. The oil conservator, upper insulating sleeve, connecting sleeve, and lower insulating sleeve are sequentially and sealed together. The outermost capacitor plate of the capacitor core is a grounding end screen. The first end of the current-carrying tube of the capacitor core extends from the end of the oil conservator away from the upper insulating sleeve, and the second end extends from the end of the lower insulating sleeve away from the connecting sleeve. The connecting sleeve is provided with a first tap electrically connected to the grounding end screen and a second tap electrically connected to another capacitor plate (excluding the grounding end screen). The elastic component is located inside the oil conservator and positioned between the current-carrying tube and the oil conservator. This double-tap seismic-resistant transformer bushing can be connected to online monitoring equipment simultaneously with grounding, preventing transformer bushing damage or transformer failure caused by grounding failures and other anomalies, and also possesses high seismic resistance.

Description

Technical Field

[0001] This invention relates to the field of power electrical equipment technology, and in particular to a double-tap anti-vibration transformer bushing. Background Technology

[0002] Transformer bushings are a crucial component of transformer equipment, and bushing failures have become a major cause of transformer equipment and power outages. Improving the seismic resistance of transformer bushings and implementing online monitoring of bushing insulation performance can reduce and prevent abnormal operating conditions.

[0003] Currently, most transformer bushings only have one test tap. After the installation of online monitoring equipment, abnormalities such as poor grounding often occur, leading to damage to the transformer bushing or transformer failure. Summary of the Invention

[0004] The purpose of this invention is to provide a double-tap anti-seismic transformer bushing to improve its operational reliability after the installation of online monitoring equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A double-tap anti-vibration transformer bushing includes 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 and sealed together. The capacitor core includes a current-carrying tube and multiple layers of insulating layers and multiple layers of capacitor screens wrapped around the current-carrying tube. The capacitor screen is composed of several layers of coaxial capacitor plates of different lengths. The capacitor plates and the insulating layers are alternately wound and spaced apart. The outermost capacitor plate of the capacitor screen is a grounded end screen. The first end of the current-carrying tube extends from the end of the oil conservator away from the upper insulating sleeve. The second end extends from the end of the lower insulating sleeve away from the connecting sleeve, and the current-carrying tube is sealed to the oil conservator 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 inside the oil conservator and is disposed between the current-carrying tube and the oil conservator, so that the second end of the current-carrying tube has a tendency to move towards the oil conservator, pressing the oil conservator, the upper insulating sleeve, the capacitor core, the connecting sleeve, and the lower insulating sleeve together.

[0007] In one embodiment of this application, the elastic member includes a compression spring and a mounting base. The mounting base is provided on the portion of the current-carrying tube located inside the oil conservator. One end of the compression spring is mounted on the mounting base, and the other end is disposed on the inner end face of the end of the oil conservator connected to the upper insulating sleeve.

[0008] In one embodiment of this application, the elastic member further includes a guide rod, one end of which is fixedly disposed on the inner end face of the end where the oil conservator is connected to the upper insulating sleeve, and the other end of which is slidably engaged with the mounting base, and the compression spring is sleeved on the guide rod.

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

[0010] In one embodiment of this application, the upper insulating sleeve is connected to the oil conservator via a first adhesive flange structure, and the upper insulating sleeve is connected to the connecting sleeve via a second adhesive flange structure.

[0011] In one embodiment of this application, the second end of the current-carrying tube is sealed and connected to the lower insulating sleeve via a base. The base is threaded to the second end of the current-carrying tube. A first sealing ring is provided between the base and the end face of the lower insulating sleeve away from the connecting sleeve. The base is screwed relative to the current-carrying tube to press the first sealing ring against the end face of the lower insulating sleeve away from the connecting sleeve.

[0012] In one embodiment of this 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 screwed relative to the current-carrying tube to press the second sealing ring against the base.

[0013] In one embodiment of this application, the lower terminal block cover is provided with an equalizing ball.

[0014] In one embodiment of this application, the first end of the current-carrying tube is connected to the upper terminal block via an end seat. The end seat covers the first end of the current-carrying tube and is connected to the end of the oil conservator away from the upper insulating sleeve. A third sealing ring is provided between the end seat and the oil conservator, surrounding the current-carrying tube.

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

[0016] As can be seen from the above technical solution, this invention discloses a double-tap anti-seismic transformer bushing, which includes an oil conservator, an upper insulating sleeve, a capacitor core, a connecting sleeve, a lower insulating sleeve, and an elastic component. The oil conservator, upper insulating sleeve, connecting sleeve, and lower insulating sleeve are sequentially and sealed together. The capacitor core includes a current-carrying tube and multiple layers of insulating layers and multiple layers of capacitor screens wrapped around the current-carrying tube. The capacitor screen is composed of several layers of coaxial capacitor plates of different lengths. The capacitor plates and insulating layers are alternately wound and spaced. The outermost capacitor plate of the capacitor screen is a grounded end screen. The first end of the tube extends from the end of the oil conservator away from the upper insulating sleeve, and the second end of the current-carrying tube extends from the end of the lower insulating sleeve away from the connecting sleeve. The current-carrying tube is sealed to the oil conservator 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 inside the oil conservator and is provided between the current-carrying tube and the oil conservator, so that the second end of the current-carrying tube has a tendency to move towards the oil conservator, pressing the oil conservator, the upper insulating sleeve, the capacitor core, the connecting sleeve, and the lower insulating sleeve together.

[0017] As can be seen, the connecting sleeve of the aforementioned double-tap seismic-resistant transformer bushing is equipped with a first tap and a second tap. The first tap is electrically connected to the grounding end screen to ensure that the double-tap seismic-resistant transformer bushing is always grounded. The second tap is electrically connected to another capacitor plate besides the grounding end screen, allowing the double-tap seismic-resistant transformer bushing to be connected to the online monitoring equipment while being grounded. This ensures that after the online monitoring equipment is installed, there will be no problems such as transformer bushing damage or transformer failure caused by poor grounding. Furthermore, the elastic force of the elastic component can tighten the various parts of the bushing, ensuring the integrity of the transformer bushing's seal under the preset seismic intensity conditions and improving the seismic resistance of the double-tap seismic-resistant transformer bushing. Attached Figure Description

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

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

[0020] Figure 2 This is a schematic diagram of the connecting sleeve of the double-tap anti-vibration transformer bushing provided in an embodiment of the present invention;

[0021] Figure 3 for Figure 1Sectional view along direction A in the middle;

[0022] Figure 4 for Figure 1 Enlarged view of a portion of point B in the middle;

[0023] Figure 5 for Figure 1 Enlarged view of a portion of point C in the middle;

[0024] Figure 6 This is a schematic diagram of the upper insulating sleeve of a double-tap anti-vibration transformer bushing provided in an embodiment of the present invention.

[0025] In the picture:

[0026] 1 is the oil conservator; 2 is the upper insulating sleeve; 201 is the insulating sleeve body; 202 is the first adhesive flange; 203 is the second adhesive flange; 3 is the capacitor core; 301 is the current-carrying tube; 302 is the capacitor screen; 4 is the connecting sleeve; 5 is the lower insulating sleeve; 6 is the upper terminal; 7 is the lower terminal; 8 is the elastic component; 801 is the compression spring; 802 is the mounting base; 803 is the guide rod; 9 is the equalizing ball; 10 is the first tap; 11 is the second tap; 12 is the base; 13 is the end seat. Detailed Implementation

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

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 3 , Figure 1 This is a half-sectional schematic diagram of a double-tap anti-vibration transformer bushing provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the connecting sleeve of the double-tap anti-vibration transformer bushing provided in an embodiment of the present invention. Figure 3 for Figure 1 Sectional view along direction A.

[0030] This invention discloses a double-tap anti-vibration transformer bushing. This bushing is used to mount on a transformer (not shown in the figure), specifically fixed to the transformer casing. One end extends out of the transformer and the other end extends into the transformer's interior. It is used to guide current from the transformer to external conductors such as cables, or to guide current from external conductors such as cables to the transformer. In this application, as... Figures 1 to 3 As shown, the bushing of the double-tap anti-vibration transformer includes an oil conservator 1, an upper insulating sleeve 2, a capacitor core 3, a connecting sleeve 4, a lower insulating sleeve 5, and an elastic component 8.

[0031] The oil conservator 1, upper insulating sleeve 2, connecting sleeve 4, and lower insulating sleeve 5 are sequentially and sealed together. The oil conservator 1 is used to store insulating oil. When the volume of insulating oil in the upper insulating sleeve 2 expands or shrinks with the temperature and operating conditions, the oil conservator 1 can regulate the amount of oil. That is, when the volume of insulating oil in the upper insulating sleeve 2 expands, the insulating oil in the outer insulating tube flows upward into the oil conservator 1. When the volume of insulating oil in the upper insulating sleeve 2 shrinks, the insulating oil in the oil conservator 1 flows to the outer insulating tube, which plays the role of replenishing oil.

[0032] The upper insulating sleeve 2 and the lower insulating sleeve 5 are hollow structures. In this 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 installed inside the oil conservator 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 multiple layers of insulating layers and multiple layers of capacitor screen 302 wrapped around the current-carrying tube 301. The current-carrying tube 301 is used to transmit current between external conductors such as transformers and cables, i.e., to carry current. The current-carrying tube 301 is a hollow tube. The capacitor screen 302 is composed of several layers of capacitor plates of different lengths and coaxiality. The capacitor plates and insulating layers are alternately wound and spaced. 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 the end of the oil conservator 1 away from the upper insulating sleeve 2, and the second end of the current-carrying tube 301 extends from the end of the lower insulating sleeve 5 away from the connecting sleeve 4. The current-carrying tube 3 is sealed to the oil conservator 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. The connecting sleeve 4 is provided with two tap fixing seats, and tap lead holes are provided on the grounding end screen and the other capacitor plate respectively. The two tap lead holes are electrically connected to the two tap fixing seats respectively, and the first tap 10 and the second tap 11 are installed on the two tap fixing seats respectively.

[0035] The elastic member 8 is located inside the oil conservator 1 and is disposed between the current-carrying tube 301 and the oil conservator 1, so that the second end of the current-carrying tube 301 has a tendency to move towards the oil conservator 1, pressing the oil conservator 1, the upper insulating sleeve 2, the capacitor core 3, the connecting sleeve 4 and the lower insulating sleeve 5 together. The elastic member 8 includes, but is not limited to, leaf springs, disc springs and compression springs.

[0036] Compared with the prior art, the connecting sleeve 4 of the double-tap earthquake-resistant transformer bushing provided in this embodiment of the invention is provided with a first tap 10 and a second tap 11. The first tap 10 is electrically connected to the grounding end screen to ensure that the double-tap earthquake-resistant transformer bushing is always grounded. The second tap 11 is electrically connected to another capacitor plate other than the grounding end screen, so that the double-tap earthquake-resistant transformer bushing can be connected to the online monitoring equipment at the same time as grounding. This ensures that after the online monitoring equipment is installed, there will be no problems such as transformer bushing damage or transformer failure caused by poor grounding. Moreover, the elastic force of the elastic member 8 can be used to tighten the various parts of the bushing, ensuring the integrity of the transformer bushing's seal under the preset earthquake intensity, improving the earthquake resistance of the double-tap earthquake-resistant transformer bushing, and reducing various abnormal situations 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 this application, such as Figure 1 and Figure 5 As shown, the elastic member 8 includes a compression spring 801 and a mounting base 802. The mounting base 802 is provided on the portion of the current-carrying tube 301 located inside the oil conservator 1. Multiple compression springs 801 are evenly distributed around the current-carrying tube 301 in the circumference. One end of the compression spring 801 is mounted on the mounting base 802, and the other end is located on the inner end face of the end of the oil conservator 1 connected to the upper insulating sleeve 2.

[0038] To further optimize the above technical solution, in one embodiment of this application, such as... Figure 5 As shown, the elastic member 8 also includes a guide rod 803. One end of the guide rod 803 is fixedly disposed on the inner end face of the end where the oil conservator 1 is connected to the upper insulating sleeve 2. The other end of the guide rod 803 is slidably engaged with the mounting base 802. The compression spring 801 is sleeved on the guide rod 803. The guide rod 803 can guide and limit the reciprocating movement of the compression spring 801 and the mounting base 802.

[0039] To further optimize the above technical solution, in one embodiment of this 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 provided on the third layer of capacitor plates from the outside to the inside.

[0040] To further improve the seismic resistance of the bushing of the double-tap seismic transformer, in one embodiment of this application, the upper insulating sleeve 2 is connected to the oil conservator 1 via a first adhesive flange structure, and the upper insulating sleeve 2 is connected to the connecting sleeve 4 via a second adhesive flange structure, such as... Figure 1 and Figure 6 As shown, in this case, the upper insulating sleeve 2 includes an insulating sleeve body 201 and a first adhesive flange 202 and a second adhesive flange 203 respectively disposed at both ends of the insulating sleeve body 201. The oil conservator 1 is provided with a first flange structure corresponding to the first adhesive flange 202, and the connecting sleeve 4 is provided with a second flange structure corresponding to the second adhesive flange 203. The first adhesive flange 202 and the first flange structure and the second adhesive flange 203 and the second flange structure are mechanically connected by bolts. The adhesive flange structure has a large adhesive ratio and high mechanical strength, which can further improve the seismic performance of the double-tap anti-seismic transformer bushing.

[0041] 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 this application, such as Figure 4 As shown, the second end of the current-carrying tube 301 is connected to the lower insulating sleeve 5 in a sealed fit through the base 12. The base 12 is threadedly connected to the second end of the current-carrying tube 301. A first sealing ring is provided between the end face of the base 12 and the lower insulating sleeve 5 away from the connecting sleeve 4. The base 12 is screwed relative to the current-carrying tube 301 to press the first sealing ring against the end face of the lower insulating sleeve 5 away from the connecting sleeve 4. In this way, the threaded fit structure between the base 12 and the current-carrying tube 301 can achieve a seal between the base 12 and the current-carrying tube 301. 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 achieve a seal 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 this application, 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 tightened relative to the current-carrying tube 301 to press the second sealing ring against the base 12.

[0043] like Figure 1 and Figure 4 As shown, the lower terminal 7 is covered with an equalizing ball 9. The equalizing ball 9, through its specific shape and material properties, can optimize the electric field distribution, reduce the occurrence of local high voltage areas, 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 this 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 covers the first end of the current-carrying tube 301 and is connected to the end of the oil conservator 1 away from the upper insulating sleeve 2. A third sealing ring is provided between the end seat 13 and the oil conservator 1, which surrounds the current-carrying tube 301. The third sealing ring can seal the gap between the end seat 13 and the oil conservator 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 conservator 1.

[0045] To further optimize the above technical solution, in one embodiment of this application, such as... Figure 5 As shown, a fourth sealing ring is installed between the end seat and the circumferential 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, 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.

[0047] 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 double-tap anti-seismic transformer bushing, characterized in that, The system includes an oil conservator (1), an upper insulating sleeve (2), a capacitor core (3), a connecting sleeve (4), a lower insulating sleeve (5), and an elastic component (8). The oil conservator (1), the upper insulating sleeve (2), the connecting sleeve (4), and the lower insulating sleeve (5) are sequentially and sealed together. The capacitor core (3) includes a current-carrying tube (301) and multiple layers of insulating layers and multiple layers of capacitor screen (302) wrapped around the current-carrying tube (301). 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 spaced apart. 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 the end of the oil conservator (1) away from the upper insulating sleeve (2), and the second end of the current-carrying tube (301) extends from the end of the lower insulating sleeve (5) away from the connecting sleeve (4). The current-carrying tube (301) and the oil conservator (1) are connected in a sealed manner. The upper insulating sleeve (5) and the lower insulating sleeve (5) are sealed together. 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. The second tap (11) is electrically connected to the third layer of capacitor plates from the outside to the inside. The grounding end screen and the third layer of capacitor plates from the outside to the inside are respectively provided with tap lead holes. The two tap lead holes are respectively electrically connected to two tap fixing seats. The first tap (10) and the second tap (11) are respectively installed on the two tap fixing seats. The elastic member (8) is located in the oil conservator (1) and is provided between the current-carrying tube (301) and the oil conservator (1) so that the second end of the current-carrying tube (301) has a tendency to move towards the oil conservator (1), pressing the oil conservator (1), the upper insulating sleeve (2), the capacitor core (3), the connecting sleeve (4) and the lower insulating sleeve (5) together.

2. The double-tap anti-seismic transformer bushing according to claim 1, characterized in that, The elastic member (8) includes a compression spring (801) and a mounting base (802). The mounting base (802) is provided on the portion of the current-carrying tube (301) located inside the oil conservator (1). One end of the compression spring is mounted on the mounting base (802), and the other end is located on the inner end face of the end of the oil conservator (1) connected to the upper insulating sleeve (2).

3. The double-tap anti-seismic transformer bushing according to claim 2, characterized in that, The elastic member (8) further includes a guide rod (803), one end of which is fixedly disposed on the inner end face of the end where the oil conservator (1) is connected to the upper insulating sleeve (2), and the other end of which is slidably engaged with the mounting base (802). The compression spring (801) is sleeved on the guide rod (803).

4. The double-tap anti-seismic transformer bushing according to any one of claims 1-3, characterized in that, The upper insulating sleeve (2) is connected to the oil conservator (1) through a first adhesive flange structure, and the upper insulating sleeve (2) is connected to the connecting sleeve (4) through a second adhesive flange structure.

5. The double-tap anti-seismic transformer bushing according to any one of claims 1-3, characterized in that, The second end of the current-carrying tube (301) is sealed and connected to the lower insulating sleeve (5) through the base (12). The base (12) is threaded to the second end of the current-carrying tube (301). A first sealing ring is provided between the base (12) and the end face of the lower insulating sleeve (5) away from the connecting sleeve (4). The base (12) is screwed relative to the current-carrying tube (301) to press the first sealing ring against the end face of the lower insulating sleeve (5) away from the connecting sleeve (4).

6. The double-tap anti-seismic transformer bushing according to claim 5, characterized in that, The second end of the current-carrying tube (301) passes through the base (12) and is threaded to the lower terminal (7). The lower terminal (7) is screwed relative to the current-carrying tube (301) to press the second sealing ring against the base (12).

7. The double-tap anti-seismic transformer bushing according to claim 6, characterized in that, The lower terminal (7) is covered with an equalizing ball (9).

8. The double-tap anti-seismic transformer bushing according to any one of claims 1-3, characterized in that, 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) covers the first end of the current-carrying tube (301). The end seat (13) is connected to the end of the oil conservator (1) away from the upper insulating sleeve (2). A third sealing ring is provided between the end seat (13) and the oil conservator (1) and surrounds the current-carrying tube (301).

9. The double-tap anti-seismic transformer bushing according to claim 8, characterized in that, A fourth sealing ring is provided between the end seat (13) and the circumferential wall of the current-carrying tube (301).

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