CN114429879B - An isolated static contact and a three-position isolation grounding switch - Google Patents

Abstract

The invention relates to an isolation static contact and a three-station isolation grounding switch. The isolation static contact comprises a front vertical seat and a rear vertical seat which are arranged at intervals along the front and rear directions, conductive contact fingers are respectively arranged on the opposite inner side walls of the two vertical seats, the conductive contact fingers are used for being in conductive contact with the moving contact, the right ends of the two vertical seats are insertion ends for the insertion of the moving contact, arc striking pieces are respectively arranged at the insertion ends of the two vertical seats, the arc striking pieces are provided with arc sections which are bent leftwards or rightwards, and the arc sections are used for being in contact with the moving contact to realize arc striking. In the bus conversion operation process, before the movable contact is separated from the conductive contact finger of the isolated static contact, the current flows mainly through the conductive contact finger; after the moving contact is separated from the conductive contact finger, a large current is led to the arc striking piece through the arc section, and when the moving contact is separated from the arc section of the arc striking piece, the arc starts to strike, and at the moment, the arc is ablated by the arc striking piece, so that the ablation of the arc to the conductive contact finger can be effectively reduced, and the service life of the isolation static contact is prolonged.

Description

An isolated static contact and a three-position isolation grounding switch

Technical field

The invention relates to a three-station isolation and grounding switch, and in particular to an isolation static contact of a three-station isolation and grounding switch.

Background technique

The renovation and expansion of old power grid transmission and substations are increasingly using HGIS switch equipment. The three-position switch with isolation and grounding function is an important part of HGIS equipment, and the requirements for its related technical parameters are getting higher and higher.

At present, the design of three-station isolating grounding switches at home and abroad is mainly divided into two methods: linear motion and rotational motion of the movable contact. For example, the Chinese patent document with authorization announcement number CN201629255U discloses a three-station isolation grounding switch, including a moving contact, an isolation static contact and a grounding static contact. The moving contact is driven by a rotating shaft to rotate. When the movable contact is in conductive contact with the isolating static contact, the isolation function is realized; when the movable contact is in conductive contact with the grounding static contact, the grounding function is realized; when the movable contact is in electrical contact with the isolating static contact or the grounding static contact, When in contact, it is the disconnected position. Among them, the isolation static contact and the grounding static contact are both provided with conductive contact fingers for conductive contact with the movable contact.

Ordinary isolating switches have bus conversion parameters of 10V and 1600A. However, as the product voltage level and the requirements for compact product structure increase, the bus conversion parameters of the isolating switch also increase. The latest required bus conversion parameters are 100V and 1600A. This means that the arc energy is higher, which can easily cause the arc to ablate the conductive fingers of the isolated static contact, affecting the service life of the isolating switch.

Contents of the invention

The purpose of the present invention is to provide an isolating static contact to solve the technical problem in the prior art that when the arc energy is high, the arc ablation of the conductive contact fingers of the isolating static contact is easily caused; the purpose of the present invention is also to provide an isolation static contact. A three-position isolation grounding switch using the isolation static contact.

In order to achieve the above object, the technical solution of the present invention for isolating static contacts is:

The isolated static contact includes a front vertical seat and a rear vertical seat arranged at intervals along the front and rear directions. Conductive contact fingers are respectively provided on the opposite inner walls of the two vertical seats. The conductive contact fingers are used for conductive contact with the movable contact. Two The right end of the vertical seat is the insertion end for the insertion of the moving contact. The two vertical seats are respectively provided with arc-starting blades at the insertion ends. The arc-striking blades have arc-shaped segments that bend to the left or right. The arc-shaped segments are used for Make contact with the moving contact to achieve arc ignition.

The beneficial effect is: during the bus conversion operation, before the movable contact and the conductive contact finger of the isolating static contact are separated, the current mainly flows through the conductive contact finger; after the movable contact and the conductive contact finger are separated, a large current flows through the arc The segment is led to the arc-striking piece. When the movable contact is separated from the arc-shaped segment of the arc-striking piece, the arc starts. At this time, the arc ablate is the arc-striking piece, so it can effectively reduce the ablation of the conductive contact fingers by the arc. , improve the service life of the isolated static contact.

As a further improvement, the arc segment is provided at the end of the arc ignition blade.

The beneficial effect is that this design is not only beneficial to the processing of the arc segment, but also beneficial to the stress deformation of the arc segment.

As a further improvement, the arc-starting blade includes a plurality of arc-starting contact fingers arranged at intervals up and down, and the arc-starting contact fingers have the arc-shaped segments.

The beneficial effect is that such a design is not only beneficial to the deformation of the arc segment, but also beneficial to the heat dissipation of the arc segment.

As a further improvement, two arc-striking blades are respectively provided on the two vertical seats, and the two arc-striking blades on the same vertical base are arranged in the left and right directions.

The beneficial effect is that this design can increase the flow capacity.

As a further improvement, the arc sections of the two arc-starting blades are bent in opposite directions.

The beneficial effect is that this design saves installation space and facilitates the insertion and extraction of the moving contacts.

As a further improvement, the arc-starting blade is fixed on the corresponding vertical base through screws.

The beneficial effect is: with this design, the arc-striking blade is more convenient to fix, has better stability, and is easier to disassemble and replace later.

As a further improvement, the two vertical bases respectively include a base and a shielding block fixed on the base through screws. The shielding block is an arc-resistant block that is resistant to arc ablation.

The beneficial effect is: with this design, the shielding block can effectively prevent its surface from being ablated by the arc into uneven spots, and can effectively optimize the electric field.

As a further improvement, the base is provided with a positioning structure for positioning the shielding block.

The beneficial effect is that this design can ensure the position accuracy of the shielding block.

As a further improvement, the arc-starting blade has a Z-shaped structure. The arc-starting blade includes a fixed section, an overhanging section and a connecting section. The connecting section is connected between the fixed section and the overhanging section, and the arc-shaped section is arranged on the overhanging section. on; the base has a step block, and the step block has a first fixed elevation facing right, a second fixed elevation facing away from the conductive contact finger, and a fixed plane facing upward; the shielding block includes a top cover that is buckled on the fixed plane part, the first enclosed part on the right side of the first fixed facade and the second enclosed part buckled on the second fixed facade; the shielding block and the step block form an installation space for installing arc ignition blades, The fixed section is fixed on the first fixed facade through screws.

In order to achieve the above objectives, the technical solution of the three-station isolation grounding switch of the present invention is:

The three-station isolating and grounding switch comprises a shell, in which a moving contact, an isolating static contact and a grounding static contact are arranged. The isolating static contact comprises a front vertical seat and a rear vertical seat arranged at intervals in the front-to-back direction. Conductive contact fingers are respectively arranged on the opposite inner side walls of the two vertical seats. The conductive contact fingers are used for conductive contact with the moving contact. The right ends of the two vertical seats are insertion ends for the moving contact to be inserted. Arc-strike pieces are respectively provided at the insertion ends of the two vertical seats. The arc-strike pieces have an arc-shaped segment bent to the left or right. The arc-shaped segment is used for contacting with the moving contact to achieve arc striking.

The beneficial effect is: during the bus conversion operation, before the movable contact and the conductive contact finger of the isolating static contact are separated, the current mainly flows through the conductive contact finger; after the movable contact and the conductive contact finger are separated, a large current flows through the arc The segment is led to the arc-striking piece. When the movable contact is separated from the arc-shaped segment of the arc-striking piece, the arc starts. At this time, the arc ablate is the arc-striking piece, so it can effectively reduce the ablation of the conductive contact fingers by the arc. , improve the service life of the isolated static contact.

As a further improvement, the arc segment is provided at the end of the arc ignition blade.

The beneficial effect is that this design is not only beneficial to the processing of the arc segment, but also beneficial to the stress deformation of the arc segment.

As a further improvement, the arc-starting blade includes a plurality of arc-starting contact fingers arranged at intervals up and down, and the arc-starting contact fingers have the arc-shaped segments.

The beneficial effect is that such a design is not only beneficial to the deformation of the arc segment, but also beneficial to the heat dissipation of the arc segment.

As a further improvement, two arc-striking blades are respectively provided on the two vertical seats, and the two arc-striking blades on the same vertical base are arranged in the left and right directions.

The beneficial effect is that this design can increase the flow capacity.

As a further improvement, the arc sections of the two arc-starting blades are bent in opposite directions.

The beneficial effect is that this design saves installation space and facilitates the insertion and extraction of the moving contacts.

As a further improvement, the arc-starting blade is fixed on the corresponding vertical base through screws.

The beneficial effect is: with this design, the arc-striking blade is more convenient to fix, has better stability, and is easier to disassemble and replace later.

As a further improvement, the two vertical bases respectively include a base and a shielding block fixed on the base through screws. The shielding block is an arc-resistant block that is resistant to arc ablation.

The beneficial effect is: with this design, the shielding block can effectively prevent its surface from being ablated by the arc into uneven spots, and can effectively optimize the electric field.

As a further improvement, the base is provided with a positioning structure for positioning the shielding block.

The beneficial effect is that this design can ensure the position accuracy of the shielding block.

As a further improvement, the arc-starting blade has a Z-shaped structure. The arc-starting blade includes a fixed section, an overhanging section and a connecting section. The connecting section is connected between the fixed section and the overhanging section, and the arc-shaped section is arranged on the overhanging section. on; the base has a step block, and the step block has a first fixed elevation facing right, a second fixed elevation facing away from the conductive contact finger, and a fixed plane facing upward; the shielding block includes a top cover that is buckled on the fixed plane part, the first enclosed part on the right side of the first fixed facade and the second enclosed part buckled on the second fixed facade; the shielding block and the step block form an installation space for installing arc ignition blades, The fixed section is fixed on the first fixed facade through screws.

Description of drawings

Figure 1 is a schematic structural diagram of Embodiment 1 of the three-station isolation grounding switch of the present invention;

Figure 2 is a top view of the isolated static contact in Figure 1;

Figure 3 is a side view of Figure 2;

Figure 4 is a schematic structural diagram of Figure 3 with the shielding block removed;

Figure 5 is a schematic structural diagram of Figure 4 with the strap contact fingers and arc ignition blades removed;

Figure 6 is a schematic structural diagram of the arc ignition blade in Figure 4;

Figure 7 is a schematic structural diagram of the shielding block in Figure 3;

In the picture: 11. Housing; 12. Moving support; 13. Grounding static contact; 14. Moving contact; 15. Isolating static contact; 16. Base; 17. First screw; 18. Conductive contact finger ; 19. Second screw; 20. Shielding block; 21. Arc section; 22. Step block; 23. First fixed facade; 24. Third screw; 25. Arc striker; 26. Positioning pin; 27. First threaded hole; 28, second threaded hole; 29, third threaded hole; 30, first pin hole; 31, fixed section; 32, connecting section; 33, overhang section; 34, third through hole; 35 , the second through hole; 36, the first through hole; 37, the second pin hole; 38, the fourth screw; 39, the fifth screw; 40, the top cover part; 41, the first enclosure part; 42, the second Enclosed part.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. That is, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present invention.

It should be noted that the possible terms such as “first” and “second” and other relational terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no actual relationship or sequence between entities or operations. Furthermore, terms such as "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed. or other elements inherent in the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or device that includes the stated element. In addition, the terms "front", "back", "upper", "lower", "left" and "right" are based on the orientation and positional relationship shown in the drawings, and are only used to facilitate the description of the present invention, rather than indicating the The devices or components referred to must have a specific orientation and are therefore not to be construed as limitations of the invention.

The features and performance of the present invention will be described in further detail below with reference to examples.

Embodiment 1 of the three-position isolation grounding switch of the present invention:

As shown in Figure 1, the three-station isolation and grounding switch includes a housing 11. A moving support 12 is provided in the housing 11. The moving support 12 extends in the vertical direction, and the upper end of the moving support 12 is fixed on the shell 11. At the top, the lower end of the movable support 12 is connected with a movable contact 14 . The housing is also provided with a grounding static contact 13 and an isolation static contact 15. The grounding static contact 13 is located on the right side of the moving support 12, and the isolation static contact 15 is located below the moving support 12. Among them, the movable contact 14 is driven and rotated by an insulating torsion bar to achieve conductive contact with the isolation static contact 15 or the grounding static contact 13, thereby realizing the isolation and grounding functions.

The direction in which the movable contact 14 is inserted into the isolating stationary contact 15 is the left-right direction. As shown in Figures 2 and 3, the isolated static contact 15 includes a front vertical seat and a rear vertical seat arranged at intervals along the front and rear directions. Conductive contact fingers 18 are respectively provided on the opposite inner walls of the two vertical seats. The conductive contact fingers 18 It is used for conductive contact with the movable contact 14. Preferably, the two vertical seats are processed with watchband contact finger mounting grooves, and the conductive contact fingers 18 are watchband contact fingers. Among them, there are two strap contact fingers spaced apart along the left and right directions on each vertical seat, a total of 62 pieces, with a theoretical throughput of 4680A.

In this embodiment, the front vertical seat and the rear vertical seat are detachably fixed and connected together through the fourth screw 38 to facilitate the processing of the watchband contact finger mounting groove. Among them, the front vertical seat and the rear vertical seat have the same structure and are arranged symmetrically. The front vertical base and the rear vertical base are fixedly connected together to form an isolated static contact 15. The isolated static contact 15 is fixed on other conductors in the housing 11 through a fifth screw 39.

In this embodiment, the right ends of the two vertical seats are the insertion ends for the moving contacts 14 to be inserted. The insertion ends of the two vertical seats are respectively provided with arc-starting blades 25. The arc-starting blades 25 have arc sections 21. 21 is used to make contact with the movable contact 14 to achieve arc ignition and thereby disperse the arc energy. Among them, the arc segment 21 is provided at the end position of the arc ignition piece 25 .

Taking the rear vertical base as an example, as shown in Figures 3 and 5, the rear vertical base includes a base 16 and a shielding block 20. The shielding block 20 and the step block 22 form an installation space for installing the arc ignition blade 25. The installation space It is Z-shaped. The base 16 has a step block 22. The step block 22 is provided with a first fixed elevation 23 facing right, a second fixed elevation facing backward and a fixed plane facing upward; the first fixed elevation 23 is provided with two The third threaded hole 29; as shown in Figure 4 and Figure 6, the arc starting piece 25 has a Z-shaped structure. The arc starting piece 25 includes a fixed section 31, an overhang section 33 and a connecting section 32. The connecting section 32 is connected to the fixed section 31 Between the overhanging section 33 and the fixed section 31, two third through holes 34 are provided. The third through holes 34 correspond to the third threaded holes 29. The arc starting blade 25 is fixed on the step block through the third screw 24. 22 on the first fixed facade 23. Among them, the arc segment 21 is provided on the overhanging segment 33.

As shown in FIGS. 3 and 4 , the arc striking blade 25 includes a plurality of arc striking contact fingers arranged at intervals up and down, and the arc striking contact fingers have the above-mentioned arc segments 21 . This design is not only beneficial to the deformation of the arc segment 21, but also beneficial to the heat dissipation of the arc segment 21.

In this embodiment, two arc-starting blades 25 are provided on the rear vertical seat, and the two arc-starting blades 25 are arranged in the left and right directions to increase the flow capacity. Among them, the arc section 25 of the left arc starting piece 25 is bent to the left, and the arc section 21 of the right arc starting piece 25 is bent to the right, which saves installation space and facilitates the insertion of the movable contact 14 into the isolated static contact 15 and the moving contact. The head 14 is separated from the isolated static contact 15 .

In this embodiment, the fixed sections of the two arc-starting blades 25 are arranged closely, and there are gaps between the connecting sections 32 and the overhanging sections 33 of the two arc-starting blades 25 so that the arc-starting contact fingers can be easily moved. The contact 14 deforms when the force is applied.

As shown in Figures 3, 4 and 7, a first threaded hole 27 is provided on the second fixed elevation, and a second threaded hole 28 is provided on the fixed plane. The shielding block 20 includes a top cover part 40 that is buckled on the fixed plane, a first enclosure part 41 on the right side of the first fixed elevation 23, and a second enclosure part 42 that is buckled on the second fixed elevation. The top cover part is provided with a second through hole 35, and the second enclosed part is provided with a first through hole 36. The first through hole 36 corresponds to the first threaded hole 27, and the second through hole 35 corresponds to the second threaded hole 28. Correspondingly, the shielding block 20 is fixed on the step block 22 through the first screw 17 and the second screw 19 . The first enclosing portion 41 is provided with an escape groove for avoiding the head of the third screw 24 .

In this embodiment, the shielding block 20 is made of CuW material, which can effectively prevent its surface from being ablated by the arc into uneven spots, and can effectively optimize the electric field.

In this embodiment, a first pin hole 30 is provided on the base 16, and a positioning pin 26 is installed in the first pin hole 30; a second pin hole 37 is provided on the first enclosing part 41, and the second pin hole 37 is positioned and matched with the positioning pin 26 to ensure the position accuracy of the shielding block 20. Among them, the positioning pin 26 constitutes the positioning structure.

As shown in FIG. 2 , the shielding block 20 is provided with an escape hole, and the escape hole is used to avoid the bolt head of the third screw 24 .

In this embodiment, the arc-starting blade 25 is made of a 2mm CuW plate, cut into several bars at the connecting section 32 and the overhanging section 33, and then bent into shape as a whole. This not only enhances the elasticity of the arc striking piece 25, but also can disperse the arc energy, facilitate heat dissipation, and is resistant to ablation, thus protecting the conductive contact finger 18.

During the bus switching operation, before the movable contact 14 is separated from the conductive contact finger 18 of the isolating static contact 15, the current mainly flows through the conductive contact finger 18. After the movable contact 14 is separated from the conductive contact finger 18, the large current is It is led to the arc-starting piece 25. When the moving contact 14 is separated from the arc-shaped section 21 of the arc-starting piece 25, the arc starts. At this time, the arc ablate is the arc-starting piece, and the material of the arc-starting piece is resistant to high temperatures, so It can effectively reduce arc ablation of conductive contact fingers.

The three-station isolation grounding switch of the present invention improves the arc ablation resistance of the isolation static contact by arranging an arc striking piece on the isolation static contact, meets the bus conversion parameters, and improves the service life.

Embodiment 2 of the three-position isolation grounding switch of the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the arc-striking blade has a Z-shaped structure, and the arc-shaped segment is provided at the end of the arc-striking blade. In this embodiment, the arc-starting blade has a zigzag structure, and the arc-shaped segment is arranged at the middle position of the arc-starting blade.

Embodiment 3 of the three-station isolation grounding switch of the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, two arc-striking blades are respectively provided on the two vertical seats, and the two arc-striking blades on the same vertical base are arranged in the left and right directions. In this embodiment, an arc-starting piece is provided on each of the two vertical seats.

Embodiment 4 of the three-position isolation grounding switch of the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the arc-shaped segments of the two arc-striking blades bend in opposite directions, that is, the arc-shaped segments of the left arc-striking blade bend to the left, and the arc-shaped segments of the right arc-striking blade bend to the left. The shape segment bends to the right. In this embodiment, the arc-shaped segments of the two arc-striking blades are bent in the same direction, that is, the arc-shaped segments of the two arc-striking blades are both bent to the left or the arc-shaped segments of the two arc-striking blades are both bent to the right.

Embodiment 5 of the three-position isolation grounding switch of the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the arc striking blade is fixed on the corresponding vertical seat through screws. In this embodiment, the arc ignition blade is pressed and mounted on the corresponding vertical seat through the shielding block.

An embodiment of the isolating static contact of the present invention. The structure of the isolating static contact in this embodiment is the same as that of the isolating static contact described in any one of Embodiments 1 to 5 of the above-mentioned three-station isolating grounding switch. No details are mentioned here. Again.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be subject to the claims. Any equivalent structural changes made using the contents of the description and drawings of the present invention, Likewise, they should all be included in the protection scope of the present invention.

Claims (8)

1. Isolated static contacts (15), including front vertical seats and rear vertical seats arranged at intervals along the front and rear directions. Conductive contact fingers (18) are respectively provided on the opposite inner walls of the two vertical seats. Conductive contact fingers (18) It is used for conductive contact with the movable contact (14). The right end of the two vertical seats is the insertion end for the movable contact (14) to be inserted. It is characterized in that the two vertical seats are respectively provided with arc-starting blades at the insertion ends. (25), the arc striking piece (25) has an arc segment (21) bent to the left or right, and the arc segment (21) is used to contact the movable contact (14) to achieve arc striking; Two arc-striking blades (25) are respectively provided on the two vertical seats, and the two arc-striking blades (25) on the same vertical base are arranged in the left and right directions; The arc sections (21) of the two arc-starting blades (25) bend in opposite directions. 2. The isolated static contact (15) according to claim 1, characterized in that the arc segment (21) is provided at the end of the arc striking piece (25). 3. The isolated static contact (15) according to claim 1 or 2, characterized in that the arc striking piece (25) includes a plurality of arc contact fingers arranged at intervals up and down, and the arc contact fingers have the arc segment (21). 4. The isolating static contact (15) according to claim 1 or 2, characterized in that the arc-starting piece (25) is fixed to the corresponding vertical seat by screws. 5. The isolated static contact (15) according to claim 1 or 2, characterized in that the two vertical bases respectively include a base (16) and a shielding block (20) fixed on the base (16) by screws. ). 6. The isolated static contact (15) according to claim 5, characterized in that the base (16) is provided with a positioning structure for positioning the shielding block (20). 7. The isolated static contact (15) according to claim 5, characterized in that the arc starting piece (25) has a Z-shaped structure, and the arc starting piece (25) includes a fixed section (31) and an overhanging section. (33) and the connecting section (32), the connecting section (32) is connected between the fixed section (31) and the overhanging section (33), the arc section (21) is arranged on the overhanging section (33); the base (16) It has a step block (22), which has a first fixed elevation (23) facing to the right, a second fixed elevation facing away from the conductive contact finger (18), and a fixed plane facing upward; shielding The block (20) includes a top cover part (40) fastened on a fixed plane, a first enclosure part (41) on the right side of the first fixed elevation (23), and a second fixed elevation fastened on the second fixed elevation. The second enclosing part (42); the shielding block (20) and the step block (22) enclose the installation space for installing the arc ignition blade, and the fixed section (31) is fixed on the first fixed facade (23) by screws . 8. Three-station isolation and grounding switch, including a casing (11). The casing (11) is provided with a moving contact (14), an isolation static contact (15) and a grounding static contact (13). It is characterized by: , the isolation static contact (15) is the isolation static contact (15) described in any one of the above claims 1 to 7.