Switching high voltage bushing end shield measuring terminal

Abstract

The application discloses a switch type high-voltage bushing end screen measurement terminal, which comprises a grounding base and a terminal cap installed at the top opening of the grounding base; a terminal post is fixed in the grounding base, a copper column is fixed in the terminal cap, the terminal post is in abutment with the inner wall of the inner contactor ring of the copper column, and a measurement line is installed at the top end of the copper column; a through opening is formed in one side of the grounding base, the through opening is sealed by a rubber film, an axial left-right rotating switch button is fixed on the inner side of the rubber film; a contact spring sheet is arranged at the corner part of the grounding base at the tail of the through opening, the execution end of the switch button is in abutment with the contact spring sheet, the contact spring sheet is attached to the corner part, and a contact block is further installed on the terminal post. The position state of the switch button is changed by pressing the rubber film, the abutment state of the contact spring sheet and the contact block is changed, the grounding terminal is grounded or disconnected, the operation is simple and convenient, the operation risk and difficulty are reduced, and the operation reliability of the end screen terminal is improved.

Description

Technical Field

[0001] This invention relates to a switch-type high-voltage bushing end-screen measuring terminal, belonging to the field of high-voltage power transmission and transformation technology. Background Technology

[0002] Currently, most capacitive high-voltage bushings use a built-in spring for grounding the end-screen measuring terminals. When conducting tests on the bushing, the terminal cap must be unscrewed to perform local square, dielectric loss, and capacitance tests. Removing the terminal cap presents several risks: first, it's complex and carries the risk of damaging the terminal cap threads due to misoperation; second, there's a risk of the terminal cap seizing onto the end-screen terminal base, preventing removal and thus hindering testing; and third, there's a risk of the terminal cap being lost during field testing, preventing grounding of the bushing. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a switchable high-voltage bushing end-screen measurement terminal, enabling bushing testing to be performed simply by pressing a switch, reducing operational risks and difficulties, and improving the operational reliability of the end-screen terminal.

[0004] The technical solution adopted in this invention is as follows:

[0005] A switch-type end-screen measurement terminal includes a grounding base installed at the grounding flange port and a terminal cap installed at the top opening of the grounding base; an end-screen terminal is installed inside the grounding base and connected to the end-screen lead on the capacitor core; a copper column is sealed and fixed inside the terminal cap; the top of the end-screen terminal is inserted into the bottom end of the copper column and abuts against the inner wall of the contact ring inside the bottom end of the copper column; a measurement line extending to the outside of the terminal cap is installed at the top of the copper column.

[0006] An opening is provided on one side of the grounding base, which communicates with the opening at the top of the grounding base. The opening is sealed with a rubber membrane, and a switch button is fixed inside the rubber membrane. The switch button is rotatably mounted inside the opening via a rotating shaft. An outwardly protruding edge is formed on the grounding base at the tail of the opening. A contact spring is provided at the edge. The actuating end of the switch button abuts against the contact spring, so that the contact spring fits against the edge.

[0007] A contact block is also installed on the terminal block of the end screen located inside the opening at the top of the grounding base; the position of the switch button is changed by pressing the rubber diaphragm; and...

[0008] When the measuring terminal is in the grounded state, the switch button is tilted upward and the actuating end abuts against the upper half of the contact spring, the contact spring is in contact with the upper half of the edge and the end abuts against the contact block;

[0009] When the measuring terminal is in the off state, the switch button is tilted downwards and the actuating end abuts against the lower half of the contact spring. The contact spring is in contact with the lower half of the edge and the end is disengaged from the contact block.

[0010] Preferably, the terminal cap is screwed onto the top opening of the grounding base, and a sealing ring is provided at the contact surface between the terminal cap and the grounding base.

[0011] Preferably, the grounding base is internally threaded with a lower insulating component, and the terminal block is embedded in and passes through the lower insulating component.

[0012] Preferably, a sealing ring is also provided at the contact point between the lower insulating component and the grounding base.

[0013] Preferably, an upper insulating member is fixed inside the terminal cap, and a copper pillar is embedded in and penetrates the upper insulating member.

[0014] Preferably, the rubber diaphragm is fixed to the opening of the grounding base by a number of clamping pads, and the clamping pads are fixed to the grounding base by bolts.

[0015] Preferably, the switch button includes a button base, a rotating shaft passing through the button base along the front and rear end direction and rotatably connected to the grounding base at the opening; a receiving cylinder is provided at the end of the button base away from the rubber membrane, a spring is placed inside the receiving cylinder, and a cross-shaped abutment is provided at the front end of the spring, the abutment being kept in contact with the contact spring under the action of the spring.

[0016] Preferably, the contact block is sleeved on the terminal block of the end screen and fixed by two locking nuts; one end of the contact block extends toward the opening.

[0017] Preferably, the terminal block and the lower insulating component are an integral structure.

[0018] Preferably, the terminal cap, upper insulating component, and copper pillar are an integral structure.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The bushing end screen can be grounded and disconnected by pressing the switch button. The operation is simple and convenient, reducing the operation risk and difficulty, and improving the reliability of the end screen terminal operation.

[0021] 2. The terminal cap, upper insulating component, and copper pillar are integrated into one structure, and the measuring line (or signal line) is led out from the copper pillar. This ensures the sealing effect of the terminal cap and allows for sleeve testing without disassembling the terminal cap. The sleeve test can be carried out simply by connecting the terminal cap to the measuring line (or signal line), making the operation simple and reliable.

[0022] 3. The outer surface of the switch button is made of rubber film. The rubber film can deform with the switch and can also achieve a seal. This truly enables the end screen terminal to carry out sleeve test measurements in a fully sealed state (the end screen terminal and the lower insulating part are an integral structure, and the terminal cap, the upper insulating part and the copper post are an integral structure. This integral structure ensures the sealing effect). Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure under the grounding condition of the measurement terminal;

[0024] Figure 2 This is a schematic diagram of the structure when the measuring terminal is not grounded;

[0025] Figure 3 This is a schematic diagram of the structure of the switch button.

[0026] The meanings of the main reference numerals in the figure are as follows:

[0027] 1. Grounding base; 2. Terminal cap; 3. Lower insulating component; 4. End screen terminal; 5. Upper insulating component; 6. Copper pillar; 7. Measuring wire; 8. Rubber diaphragm; 9. Pressing pad; 10. Switch button; 11. Contact spring; 12. Button base; 13. Receiving cylinder; 14. Spring; 15. Abutting component; 16. Contact block; 17. Locking nut; 18. Contact ring; 19. Rotating shaft. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-3 As shown: This embodiment is a switchable high-voltage bushing end-screen measuring terminal, including a grounding base 1 installed at the grounding flange port and a terminal cap 2 screwed onto the top opening of the grounding base 1. A sealing ring is provided at the contact surface between the terminal cap 2 and the grounding base 1. A lower insulating component 3 is threaded into the axial hole inside the grounding base 1, and a sealing ring is also provided at the contact point between the lower insulating component 3 and the grounding base 1. An end-screen terminal 4 is fixed in the axial hole of the lower insulating component 3. The end-screen terminal 4 is connected to the end-screen lead on the capacitor core. The lower insulating component 3 is cast from insulating material. Before casting, the end-screen terminal 4 is fixed in the mold, and then casting is performed so that the lower insulating component 3 and the end-screen terminal 4 become an integral structure after molding.

[0030] An upper insulating component 5 is fixed inside the axial hole of the terminal cap 2, and a copper pillar 6 is fixed inside the upper insulating component 5. The top of the terminal block 4 is inserted into the bottom end of the copper pillar 6 and abuts against the inner wall of the contact ring 18 embedded in the copper pillar 6. A measuring line 7 extending to the outside of the terminal cap 2 is installed at the top of the copper pillar 6. The upper insulating component 5 is also cast from insulating material. Before casting, the terminal cap 2 and the copper pillar 16 with the contact ring 18 embedded are first fixed in the mold, and then cast, so that the upper insulating component 5, the terminal cap 2, and the copper pillar 16 become an integral structure after molding.

[0031] The insulating material is selected from epoxy resin or insulating plastic.

[0032] An opening is provided on one side of the grounding base 1, which communicates with the opening at the top of the grounding base 1. The opening is sealed by a rubber membrane 8, which has a certain deformation capacity. The rubber membrane 8 is fixed to the opening of the grounding base 1 by several pressing pads 9. The pressing pads 9 are fixed to the grounding base 1 by bolts.

[0033] A switch button 10 is adhered and fixed to the inside of the rubber membrane 8. The switch button 10 is fixed to the grounding base 1 at the opening via a rotating shaft 19 and can rotate relative to each other. An outwardly protruding edge is formed on the grounding base 1 at the tail of the opening, and a contact spring 11 is provided at the edge. The switch button 10 includes a button base 12. The rotating shaft 19 passes through the button base 12 along the front and rear end direction and is rotatably connected to the grounding base 1 at the opening. A receiving cylinder 13 is provided at the end of the button base 12 away from the rubber membrane 8. A spring 14 is placed inside the receiving cylinder 13. A cross-shaped abutment 15 is provided at the front end of the spring 14. The abutment 15 is kept in contact with the contact spring 11 under the action of the spring 14, and the contact spring 11 is in contact with the edge.

[0034] A contact block 16 is also installed on the terminal block 4 located in the top opening of the grounding base 1. The contact block 16 is sleeved on the terminal block 4 and fixed by two locking nuts 17; one end of the contact block 16 extends toward the opening.

[0035] In practical applications, the grounding state of the measuring terminal is achieved by changing the position of the switch button 10 by pressing the rubber diaphragm 8. When the measuring terminal is in the grounding state, the switch button 10 is tilted upwards and the abutment 15 is held in contact with the upper half of the contact spring 11 by the action of the spring 14. At this time, the contact spring 11 is in contact with the upper half of the corner portion and its end is in contact with the contact block 16, maintaining the grounding state. Figure 1 ).

[0036] When it is necessary to adjust the measuring terminal to the off state (non-grounded state), press the switch button 10 to tilt it downwards. At this time, the abutment 15 abuts against the lower half of the contact spring 11. At this time, the contact spring 11 is in contact with the lower half of the corner and the end is disengaged from the contact block 16, thus disengaging from the grounded state. Figure 2 ).

[0037] During bushing testing, the grounding state can be changed simply by pressing switch button 10, thus reducing operational risks and difficulties and improving the operational reliability of the end-screen terminal. Simultaneously, the integrated lower insulating component 3, end-screen terminal 4, and integrated upper insulating component 5, terminal cap 2, and copper post 16 are sealed by a sealing ring and the opening is sealed by a rubber diaphragm 8, enabling bushing testing and measurement of the end-screen terminal in a fully sealed state, improving data reliability. Furthermore, after the measuring line 7 is led out from the copper post 6, the terminal cap 2 does not need to be disassembled during bushing testing; it only needs to be connected to the measuring line 7 to conduct the bushing test, making operation simple and reliable.

[0038] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A switch-type high-voltage bushing end-screen measuring terminal, characterized in that, It includes a grounding base installed at the grounding flange port and a terminal cap installed at the top opening of the grounding base; the grounding base is equipped with a terminal post connected to the terminal lead on the capacitor core, and a copper post is sealed and fixed inside the terminal cap. The top of the terminal post is inserted into the bottom of the copper post and abuts against the inner wall of the contact ring inside the bottom of the copper post. A measuring line extending to the outside of the terminal cap is installed at the top of the copper post. An opening is provided on one side of the grounding base, which communicates with the opening at the top of the grounding base. The opening is sealed with a rubber membrane, and a switch button is fixed inside the rubber membrane. The switch button is rotatably mounted inside the opening via a rotating shaft. An outwardly protruding edge is formed on the grounding base at the tail of the opening. A contact spring is provided at the edge. The actuating end of the switch button abuts against the contact spring, so that the contact spring fits against the edge. A contact block is also installed on the terminal block of the end screen located inside the opening at the top of the grounding base; the position of the switch button is changed by pressing the rubber diaphragm; and... When the measuring terminal is in the grounded state, the switch button is tilted upward and the actuating end abuts against the upper half of the contact spring, the contact spring is in contact with the upper half of the edge and the end abuts against the contact block; When the measuring terminal is in the off state, the switch button is tilted downwards and the actuating end abuts against the lower half of the contact spring. The contact spring is in contact with the lower half of the edge and the end is disengaged from the contact block.

2. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, The terminal cap is screwed onto the top opening of the grounding base, and a sealing ring is provided at the contact surface between the terminal cap and the grounding base.

3. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, The grounding base is internally threaded with a lower insulating component, and the terminal block is embedded in and passes through the lower insulating component.

4. The switch-type high-voltage bushing end-screen measuring terminal according to claim 3, characterized in that, A sealing ring is also provided at the contact point between the lower insulating component and the grounding base.

5. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, An upper insulating component is fixed inside the terminal cap, and a copper pillar is embedded in and penetrates the upper insulating component.

6. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, The rubber diaphragm is fixed to the opening of the grounding base by several clamping pads, and the clamping pads are fixed to the grounding base by bolts.

7. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, The switch button includes a button base, a rotating shaft passing through the button base along the front and rear end direction and rotatably connected to the grounding base at the opening; a receiving cylinder is provided at the end of the button base away from the rubber membrane, a spring is placed inside the receiving cylinder, and a cross-shaped abutment is provided at the front end of the spring, the abutment being kept in contact with the contact spring under the action of the spring.

8. The switch-type high-voltage bushing end-screen measuring terminal according to claim 1, characterized in that, The contact block is sleeved on the terminal block of the end screen and fixed by two locking nuts; one end of the contact block extends toward the opening.

9. The switch-type high-voltage bushing end-screen measuring terminal according to claim 3, characterized in that, The terminal block and the lower insulating component are an integral structure.

10. The switch-type high-voltage bushing end-screen measuring terminal according to claim 5, characterized in that, The terminal cap, upper insulating component, and copper pillar are integrated into one structure.

Images