CN102306588B - Combined electrode column of vacuum arc extinguishing chamber - Google Patents

Abstract

A combined vacuum interrupter pole, which overcomes the problems of low flow capacity and weak heat dissipation of the existing solid-sealed pole. In severe cases, it may reach the glass transition temperature of epoxy resin and cause major accidents. Features It is to set the epoxy resin pouring point at the part where the upper shielding ring, the upper insulating cylinder, the upper outlet end, the lower insulating cylinder and the shielding electrode are connected to each other, and inject the pre-mixed epoxy resin and curing agent to seal the shielding electrode, the lower insulating cylinder , the upper outlet terminal, the upper insulating cylinder and the upper shielding ring are firmly connected together to form a pole cover, and a vacuum interrupter is installed in the pole cover, and the pole conduction is realized by the moving contact, the spring contact finger and the lower outlet end. connection, the beneficial effect is that the manufacturing process of the pole is simplified, the insulation capacity of the pole is improved, and the production cost of the pole is reduced. Once the quality problem of the vacuum interrupter itself occurs, only the vacuum interrupter needs to be replaced. The outer poles can still be used and thus facilitate the installation and replacement of the vacuum interrupter.

Description

A Combined Vacuum Interrupter Pole

technical field

The invention belongs to the technical field of high-voltage electrical appliances, and in particular relates to a pole column of a combined vacuum interrupter used in a vacuum circuit breaker of a 126kV high-voltage system.

Background technique

In the prior art, the poles of the vacuum interrupter are usually solid-sealed poles, which are made by the APG (automatic pressure gel) process, which requires several sets of special automatic pressure gel molds, vacuum mixers, molding machines, post-processing For special equipment such as curing constant temperature heating box, the finished pole must be inspected by X-ray perspective to determine whether there are internal defects. Therefore, the investment in molds and equipment is large, and the production cycle is long, especially X-ray perspective inspection. A special high-power X-ray machine is required, which is very expensive, and a special lead room and labor protection measures are also required. Once a quality problem occurs during the sealing process, not only the epoxy resin and silicone parts of the pole need to be smashed and scrapped, Even the expensive vacuum interrupter may be scrapped at the same time, so the production is more difficult. With the increase of the voltage level, the size of the vacuum interrupter continues to increase, the difficulty of manufacture is also increasing, and the cost is increasing. In addition, because the vacuum interrupter is completely sealed inside the epoxy resin shell, the flow capacity is low, the heat dissipation capacity is weak, and the temperature rise of the pole is high. In severe cases, it may reach the glass transition temperature of epoxy resin , resulting in a larger accident.

Contents of the invention

The problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a 126kV high-voltage system that can simplify the manufacturing process of the pole, reduce the production cost of the pole, and facilitate the adjustment of the mechanical characteristics of the circuit breaker. A combined vacuum interrupter pole in a vacuum circuit breaker.

The technical scheme adopted in the present invention includes shielding electrodes, lower insulating cylinders, upper outlet terminals, upper insulating cylinders, upper shielding rings, and mounting flanges, and a first epoxy resin pouring is provided at the parts where the upper shielding rings and the upper insulating cylinders are connected to each other. A second epoxy resin pouring point is set at the part where the upper insulating cylinder and the upper outlet end are connected to each other, and a third epoxy resin pouring point is arranged at the part where the upper insulating cylinder and the lower insulating cylinder are connected to each other. The parts where the shielding electrodes are connected to each other are provided with a fourth epoxy resin pouring point, at the first epoxy resin pouring point, the second epoxy resin pouring point, the third epoxy resin pouring point and the fourth epoxy resin pouring point Inject pre-mixed epoxy resin and curing agent, firmly connect the shielding electrode, the lower insulating cylinder, the upper outlet terminal, the upper insulating cylinder and the upper shielding ring together to form a pole cover, and assemble a vacuum arc extinguisher in the pole cover The chamber, and the conductive connection of the pole is realized by the moving contact, the spring contact finger and the lower outlet terminal.

The first epoxy resin pouring point, the second epoxy resin pouring point, the third epoxy resin pouring point and the fourth epoxy resin pouring point are all composed of two annular grooves. There are two injection round holes for processing.

Compared with the existing traditional solid-sealed pole, the beneficial effects of the present invention are:

(1) The pole is an assembled structure, which is filled with epoxy resin to connect conductors, insulating cylinders, and shielding electrodes, replacing the traditional automatic pressure gel process to make poles, simplifying the production process of poles, and The insulation ability of the pole is improved, and the investment in special molds, special production equipment and special testing instruments is avoided, and the production cost of the pole is reduced;

(2) The epoxy resin is poured and mixed in the air without vacuum operation. The resin pouring can be completed with a simple injection tool, and it can be cured at room temperature without heating equipment, and the epoxy resin used for connection is completely Within the shielding range of the electrode, its internal defects will not affect the insulation performance of the pole (partial discharge, power frequency or impact), so there is no need for X-ray inspection.

(3) The vacuum interrupter is changed from a solid-sealed structure to an assembled structure. The vacuum interrupter is assembled in the pole, which is flexible and convenient. Once the quality problem of the vacuum interrupter itself occurs, only the vacuum interrupter needs to be replaced. , the external poles can still be used, which facilitates the installation and replacement of the vacuum interrupter, and the sulfur hexafluoride gas with strong thermal conductivity between the vacuum interrupter and the insulating cylinder improves the performance of the poles. The heat dissipation conditions are conducive to convection and heat conduction to dissipate heat, reduce the temperature rise of the pole, increase the carrying capacity of the pole, and make the operation of the equipment safer.

(4) The shape and position of the upper and lower outlet terminals and the electric field shielding electrodes balance the electric field between the upper and lower outlet terminals of the arc extinguishing chamber and the upper outlet terminal and the grounded fixed flange. Dielectric strength between phases.

For the first time in this invention, a 126kV vacuum interrupter is made into a pole and installed on a 126kV C-GIS product. After experimental use, the mechanical strength is higher than the product's dynamic and thermal stability requirements, and the insulation strength meets the requirements of the national standard.

Description of drawings

Fig. 1 is the front view of the present invention,

Fig. 2 is A-A sectional view of Fig. 1,

Figure 3 Enlarged view of part B of Figure 2,

Figure 4 The enlarged view of part C of Figure 2,

Fig. 5 Enlarged view of part D of Fig. 2,

Fig. 6 is a partial expanded view of the annular groove.

1. Shielding electrode, 2. Lower insulating cylinder,

3. Upper outlet terminal, 4. Upper insulating barrel,

5. Upper shielding ring, 6. Moving contact,

7. Vacuum interrupter, 8. Lower outlet terminal,

9. Spring finger, 10. pole cover,

11. First epoxy pour point,

12 second epoxy pour point,

13. Third epoxy pour point,

14. Fourth epoxy pour point,

15. Annular groove,

16. Filling round hole

17. Install the flange.

Detailed ways

Specific embodiments of the present invention are provided below in conjunction with the accompanying drawings.

As shown in the drawings, the present invention includes a shielding electrode 1, a lower insulating cylinder 2, an upper outlet terminal 3, an upper insulating cylinder 4, an upper shielding ring 5 and a mounting flange 17, and the upper shielding ring 5 and the upper insulating cylinder 4 are connected to each other The first epoxy resin pouring point 11 composed of two annular grooves 15 is set at the position, and the second epoxy resin composed of two annular grooves 15 is arranged at the part where the upper insulating cylinder 4 and the upper outlet end 3 are connected to each other. The pouring point 12, the third epoxy resin pouring point 13 composed of two annular grooves 15 is set at the part where the upper outlet end 3 and the lower insulating cylinder 2 are connected to each other, and the third epoxy resin pouring point 13 is set at the part where the lower insulating cylinder 2 and the shielding electrode 1 are connected to each other There is a fourth epoxy resin pouring point 14 composed of two annular grooves 15, each of the above two annular grooves 15 of each epoxy resin pouring point is processed with two injection round holes 16, through each annular groove One of the injection holes 16 on the groove 15 injects the mixture of premixed epoxy resin and curing agent into the two annular grooves 15, and the other injection hole 16 is used for exhaust during the injection process. After curing at room temperature, the shielding electrode 1, the lower insulating cylinder 2, the upper outlet terminal 3, the upper insulating cylinder 4 and the upper shielding ring 5 are firmly connected together to form a pole cover 10 to form an insulation structure of the vacuum interrupter pole. The vacuum interrupter 7 is assembled in the pole cover 10, and the conductive connection of the pole is realized by the movable contact 6, the spring contact finger 9 and the lower outlet terminal 8, and the assembly of the entire pole is completed.

In use, after the present invention is installed in the gas box of the circuit breaker, the sulfur hexafluoride gas of the rated pressure (0.1-0.2 MPa air pressure) is filled to realize the composite insulation of the vacuum interrupter, and at the same time, the sulfur hexafluoride gas plays To enhance the heat dissipation function, each conductive element of the pole of the vacuum interrupter not only has the function of connecting the circuit and transmitting electric energy, but also has the function of balancing the phase-to-phase and relative-to-ground electric fields.

Claims (2)

1. A pole of a combined vacuum interrupter, including a shielding electrode (1), a lower insulating cylinder (2), an upper outlet terminal (3), an upper insulating cylinder (4) and an upper shielding ring (5) and an installation method Lan (17), characterized in that a first epoxy resin pouring point (11) is provided at the part where the upper shielding ring (5) and the upper insulating cylinder (4) are connected to each other, and the upper insulating cylinder (4) and the upper outgoing line A second epoxy resin pouring point (12) is provided at the part where the terminals (3) are connected to each other, and a third epoxy resin pouring point (13) is provided at the part where the upper outlet end (3) and the lower insulating cylinder (2) are connected to each other. ), the fourth epoxy resin pouring point (14) is set at the part where the lower insulating cylinder (2) and the shielding electrode (1) are connected to each other, and at the first epoxy resin pouring point (11), the second epoxy resin Inject the pre-mixed epoxy resin and curing agent into the pouring point (12), the third epoxy resin pouring point (13) and the fourth epoxy resin pouring point (14), and place the shielding electrode (1), the lower insulating cylinder (2), the upper outlet terminal (3), the upper insulating cylinder (4) and the upper shielding ring (5) are firmly connected together to form a pole cover (10), and a vacuum interrupter ( 7), and the conductive connection of the pole is realized by the moving contact (6), the spring contact finger (9) and the lower outlet terminal (8). 2. A combined vacuum interrupter pole according to claim 1, characterized in that the first epoxy resin pouring point (11), the second epoxy resin pouring point (12), the third ring Both the epoxy resin pouring point (13) and the fourth epoxy resin pouring point (14) are made up of two annular grooves (15), each of which is processed with two circular injection holes ( 16).

Images