A capacitive bushing end screen grounding device

Abstract

The present invention discloses a capacitive bushing end screen grounding device, which adopts a grounding copper sheet bolt fastening method for reliable grounding without the risk of poor grounding. At the same time, the end screen grounding device is built into the flange, so that it forms an integrated end screen grounding device structure with the flange, ensuring the connection reliability and sealing performance of the end screen grounding device. At the same time, it can simplify the operation process during the bushing test. During the insulation test, the end screen protective cover is first removed, and the grounding copper sheet can be toggled to disconnect the end screen from the flange by loosening the nuts and screws. The operation is convenient, there is no risk of incorrect operation, and it can avoid the occurrence of poor grounding of the bushing end screen due to multiple disassembly.

Description

Technical Field

[0001] The invention relates to a capacitive bushing end screen grounding device, belonging to the field of electrical technology. Background Art

[0002] The transformer bushing's end shield is connected to the ground at the same potential. It must be grounded during operation. During preventive testing, it must be disconnected to measure the bushing's capacitance and dielectric loss, thereby assessing the insulation condition of the capacitive shield. Existing transformer bushing end shield grounding methods mostly use elastic contact grounding, employing springs, springs, or elastic contacts. Elastic contact end shield devices are subject to the risk of aging and poor contact due to elastic contact components. This can easily lead to loss of grounding, potentially causing insulation failure.

[0003] In addition, the existing transformer bushing end screen devices all adopt an end screen base structure. The end screen base needs to be connected to the flange with bolts. The end screen device and the flange have a split connection structure. A sealing ring needs to be used to seal between the end screen base and the flange, which poses a risk of sealing leakage. Summary of the Invention

[0004] The present invention provides a capacitive bushing end screen grounding device to solve the deficiencies in the above-mentioned background technology.

[0005] The technical solution adopted in the present invention is:

[0006] A capacitive bushing end screen grounding device, comprising:

[0007] An insulating sleeve is arranged in a terminal seat on the bushing flange body;

[0008] The terminal is coaxially arranged in the insulating sleeve, with the upper end extending above the insulating sleeve, the lower end being limited in the insulating sleeve, and the bottom end being connected to the end screen lead; by rotating the grounding copper sheet with the opening at the bottom end of the grounding copper sheet as the vertical center line, the grounding copper sheet is connected or disconnected with the terminal, thereby achieving grounding or disconnection of the end screen;

[0009] The grounding copper sheet is rotatably connected to the top of the terminal block at its bottom end, and a bayonet is provided on one side of the top end, through which the grounding copper sheet is clamped to the upper end of the terminal block;

[0010] The locking nut is screwed onto the terminal above the grounding copper plate.

[0011] As a preferred embodiment of the present invention, the grounding device further includes:

[0012] The pressure ring is sleeved on the outside of the insulating sleeve and fixedly connected to the terminal seat, and is used to limit the insulating sleeve.

[0013] As a preferred embodiment of the present invention, the grounding device further includes:

[0014] The compression nut is screwed onto the terminal located above the insulating sleeve and between the grounding copper sheet, and cooperates with the locking nut to fix the top of the grounding copper sheet.

[0015] As a preferred embodiment of the present invention, the grounding device further includes:

[0016] The protective cover and the fixed cover are arranged outside the terminal block, and the terminal posts and the grounding copper sheet are located inside the protective cover.

[0017] As a preferred embodiment of the present invention, a convex ring is formed at the lower end of the terminal, and a sealing ring is provided on the terminal sleeve above the convex ring, and the sealing ring abuts against the top surface of the recessed groove at the bottom end of the insulating sleeve.

[0018] As a preferred embodiment of the present invention, the inner hole of the terminal seat is an inverted convex structure, and a sealing ring 2 with an inverted convex structure is provided in the terminal seat, and the sealing ring 2 abuts against the bottom end of the insulating sleeve and the bottom end of the pressure ring.

[0019] As a preferred embodiment of the present invention, a convex ring 2 is formed at the lower end of the insulating sleeve and abuts against the inner step surface of the terminal seat, and a sealing ring 3 is provided on the outer cover of the insulating sleeve above the convex ring 2, and the sealing ring 3 abuts against the top surface of the groove at the bottom end of the pressure ring.

[0020] As a preferred embodiment of the present invention, a recessed groove is provided at the bottom end of the clamping nut, and a sealing ring four is provided in the recessed groove. The sealing ring four is sleeved on the terminal above the insulating sleeve and abuts against the top surface of the insulating sleeve.

[0021] As a preferred embodiment of the present invention, a sealing ring 5 is provided at the connection between the protective cover and the terminal seat.

[0022] The beneficial effects of the present invention are:

[0023] 1. Simple structure and easy operation. The grounding device is built into the flange body, forming an integrated structure with the flange body, ensuring the safety, reliability, and sealing of the grounding device. The grounding status of the end screen can be changed without disassembling the main structure of the grounding device. The test operation is simple, safe, and reliable, completely eliminating the risk of the end screen losing grounding during bushing operation, optimizing the on-site installation and use process, and simplifying the test operation during the test process.

[0024] 2. Reliable grounding is achieved through grounding copper sheet bolt fastening, which increases the grounding area of the contact surface, effectively reducing the risk of poor grounding due to aging of the product structure, making the structure safer and more reliable.

[0025] 3. Grounding copper sheets are easy to produce and process, with relatively low costs and easy replacement. Fastening parts are standard, easy to purchase, and do not require additional production or processing.

[0026] 4. The terminal shield's protective cover protects the terminal shield and is not part of the terminal shield's reliable grounding loop. Therefore, there is no risk of the shield losing ground due to the cover. When the bushing terminal shield is unprotected, the shield is already reliably grounded, eliminating the risk of ground loss associated with frequent removal of traditional grounding covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of the grounding device provided by the present invention;

[0028] Figure 2 It is the grounding status diagram of the last screen of the grounding device control;

[0029] The main reference numerals in the figures have the following meanings:

[0030] 1. Insulation sleeve, 2. Terminal block, 3. Grounding copper sheet, 4. Locking nut, 5. Pressure ring, 6. Pressure nut, 7. Protective cover, 8. Sealing ring 1, 9. Sealing ring 2, 10. Sealing ring 3, 11. Sealing ring 4, 12. Sealing ring 5, 13. Screws, 14. Flange body. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-2 As shown: This embodiment is a capacitive bushing end screen grounding device, including an insulating sleeve 1, a terminal 2, a grounding copper sheet 3, a locking nut 4, a pressure ring 5, a compression nut 6 and a protective cover 7.

[0033] like Figure 1 As shown, the insulating sleeve 1 is arranged in the terminal seat on the bushing flange body 14; the terminal 2 is coaxially arranged in the insulating sleeve 1, the upper end of the terminal 2 extends above the insulating sleeve 1, the lower end of the terminal 2 is limited in the insulating sleeve 1, and the bottom end of the terminal 2 is connected to the end screen lead; the bottom end of the grounding copper plate 3 is rotatably connected to the top of the terminal seat, as shown in FIG. Figure 2 As shown, a bayonet is provided on one side of the top of the grounding copper sheet 3, and the grounding copper sheet 3 is clamped with the upper end of the terminal 2 through the bayonet. By rotating the grounding copper sheet 3 with the opening at the bottom end of the grounding copper sheet 3 as the vertical center line, the grounding copper sheet 3 is connected or disconnected with the terminal 2, thereby realizing the grounding or disconnection of the end screen.

[0034] The locking nut 4 is screwed onto the terminal post 2 located above the grounding copper sheet 3; the pressure ring 5 is sleeved on the outside of the insulating sleeve 1 and fixedly connected to the terminal seat, which is used to limit the insulating sleeve 1; the compression nut 6 is screwed onto the terminal post 2 located above the insulating sleeve 1 and between the grounding copper sheet 3, and cooperates with the locking nut 4 to fix the top of the grounding copper sheet 3.

[0035] The protective cover 7 is fixedly arranged outside the terminal base, and forms a space with the terminal base for protecting components such as the terminal post 2 and the grounding copper sheet 3.

[0036] A convex ring 1 is formed at the lower end of the terminal 2, and a sealing ring 1 8 is provided on the outer sleeve of the terminal 2 above the convex ring 1. The sealing ring 1 8 abuts against the top surface of the recessed groove at the bottom end of the insulating sleeve 1.

[0037] The inner hole of the terminal seat is an inverted convex structure and is connected to the inner cavity of the flange. A sealing ring 2 9 with an inverted convex structure is provided in the terminal seat. The sealing ring 2 9 abuts against the bottom end of the insulating sleeve 1 and the bottom end of the pressure ring 5.

[0038] A convex ring 2 is formed at the lower end of the insulating sleeve 1 and abuts against the inner step surface of the terminal seat. A sealing ring 3 10 is provided on the outer cover of the insulating sleeve 1 above the convex ring 2. The sealing ring 3 10 abuts against the top surface of the groove at the bottom end of the pressure ring 5.

[0039] A recessed groove is provided at the bottom end of the compression nut 6 , in which a sealing ring 4 11 is provided. The sealing ring 4 11 is sleeved on the terminal 2 located above the insulating sleeve 1 and abuts against the top surface of the insulating sleeve 1 .

[0040] A sealing ring 5 12 is provided at the connection between the protective cover 7 and the terminal seat.

[0041] During assembly, first place the sealing ring 2 9 into the terminal seat of the flange body 14, then weld the end screen lead to the bottom end of the terminal 2. Then put the terminal 2, insulation sleeve 1, compression nut 6 and sealing ring 1 8, sealing ring 4 11 as shown in the figure. Figure 1 The terminal assembly is assembled into an integrated form and placed in the terminal seat. Then the sealing ring 10 is placed on the insulating sleeve 1, and the pressure ring 5 is screwed into the terminal seat of the flange body 14 to compress the insulating sleeve 1.

[0042] Install the grounding copper sheet 3 onto the assembled terminal assembly. Secure the punched end to the terminal block with screws 13, and secure the bayonet-shaped end to the terminal post 2 with locknuts 4. Tighten screws 13 and locknuts 4 to ensure a secure connection between the terminal post 2 and the grounding copper sheet 3, and between the grounding copper sheet 3 and the flange body 14. Finally, screw on the protective cover 7.

[0043] When the bushing operates normally, the flange body 14 is grounded, and the end screen can be reliably grounded through the path of the end screen lead, the terminal 2, the grounding copper sheet 3, and the flange body 14.

[0044] When measuring the dielectric loss and partial discharge of the bushing, remove the protective cover 7 and gently loosen the screws 13 and locknut 4 securing the grounding copper plate 3 to loosen it. Move the grounding copper plate 3 to separate the terminal 2 and the grounding copper plate 3 along the latch to change the grounding state.

[0045] After the measurement is completed, the grounding copper sheet 3 must be pulled back, and the screw 13 and the lock nut 4 must be tightened to ensure that the end screen is reliably grounded when the bushing is running, and then the protective cover 7 can be tightened onto the terminal seat of the flange body 14.

[0046] In summary, the present invention provides a capacitive bushing end screen grounding device, which uses a grounding copper sheet bolt fastening method to ensure that the bushing end screen is reliably grounded during operation, without the risk of poor grounding. At the same time, the present invention embeds the end screen grounding device inside the flange, so that it forms an integrated end screen grounding device structure with the flange, ensuring the connection reliability and sealing performance of the end screen device. At the same time, the present invention simplifies the operating process during the bushing test. During the insulation test, the end screen protective cover is first removed, and the grounding copper sheet can be moved to disconnect the end screen from the flange by loosening the nuts and screws. The operation is convenient, there is no risk of incorrect operation, and it can avoid the occurrence of poor grounding of the bushing end screen due to multiple disassembly.

[0047] The above is only a preferred embodiment of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A capacitive bushing end screen grounding device, characterized in that: include: An insulating sleeve is arranged in a terminal seat on the bushing flange body; The terminal is coaxially arranged in the insulating sleeve, with the upper end extending above the insulating sleeve, the lower end being limited in the insulating sleeve, and the bottom end being connected to the end screen lead; The grounding copper sheet is rotatably connected to the top of the terminal block at its bottom end, and a bayonet is provided on one side of the top end. The grounding copper sheet is clamped to the upper end of the terminal block through the bayonet. By rotating the grounding copper sheet with the opening at the bottom end of the grounding copper sheet as the vertical center line, the grounding copper sheet is connected or disconnected to the terminal block, thereby achieving grounding or disconnection of the end screen. The locking nut is screwed onto the terminal above the grounding copper sheet; The pressure ring is sleeved on the outside of the insulating sleeve and fixedly connected to the terminal block, and is used to limit the position of the insulating sleeve; The compression nut is screwed onto the terminal located above the insulating sleeve and between the grounding copper sheet, and cooperates with the lock nut to fix the top of the grounding copper sheet; The protective cover and the fixed cover are arranged outside the terminal block, and the terminal posts and the grounding copper sheet are located inside the protective cover.

2. A capacitive bushing end screen grounding device according to claim 1, characterized in that: A convex ring 1 is formed at the lower end of the terminal post, and a sealing ring 1 is provided on the terminal post outer sleeve above the convex ring 1. The sealing ring 1 abuts against the top surface of the sink groove at the bottom end of the insulating sleeve.

3. The capacitive bushing end screen grounding device according to claim 1, characterized in that: The inner hole of the terminal seat is an inverted convex structure, and a sealing ring 2 with an inverted convex structure is provided in the terminal seat. The sealing ring 2 abuts against the bottom end of the insulating sleeve and the bottom end of the pressure ring.

4. A capacitive bushing end screen grounding device according to claim 3, characterized in that: A convex ring 2 is formed at the lower end of the insulating sleeve and abuts against the inner step surface of the terminal seat. A sealing ring 3 is provided on the outer cover of the insulating sleeve above the convex ring 2 and abuts against the top surface of the groove at the bottom end of the pressure ring.

5. The capacitive bushing end screen grounding device according to claim 1, characterized in that: A recessed groove is provided at the bottom end of the compression nut, and a sealing ring four is provided in the recessed groove. The sealing ring four is sleeved on the terminal post located above the insulating sleeve and abuts against the top surface of the insulating sleeve.

6. The capacitive bushing end screen grounding device according to claim 1, characterized in that: A sealing ring 5 is provided at the connection between the protective cover and the terminal seat.

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