Resistor structure for isolating switch static contact and isolating switch static contact

Abstract

The utility model relates to the field of resistors combined with a switch device structure, in particular to a resistor structure for a static contact of an isolating switch and the static contact of the isolating switch. The static contact of the isolating switch comprises a resistor structure which is arranged between an upper shielding case and a lower shielding case of the static contact and connected with the upper shielding case and the lower shielding case, and the resistor structure comprises an integrated resistor rod and a conductive supporting rod which is connected to the bottom of the integrated resistor rod and used for supporting the integrated resistor rod in a conductive mode. And the center of the top of the conductive supporting rod is provided with an avoiding groove for avoiding a bottom element of the integrated resistor rod. By arranging the conductive supporting rod, when the distance between the upper shielding case and the lower shielding case is increased, the existing integrated resistor rod can still be installed between the upper shielding case and the lower shielding case and can be normally used, so that the installation flexibility of the existing integrated resistor rod is higher; the problem that an existing integrated resistor rod cannot be fixedly connected with a lower shielding case due to the fact that the distance between the upper shielding case and the lower shielding case of a static contact is increased is solved.

Description

Technical Field

[0001] This utility model relates to the field of resistors integrated into the structure of switching devices, and more particularly to a resistor structure for a stationary contact of a disconnecting switch and a stationary contact of a disconnecting switch. Background Technology

[0002] Disconnect switches are a key component of GIS equipment, performing functions such as maintenance and sectional isolation, busbar switching, and switching on and off unloaded circuits. However, disconnect switches are prone to transient overvoltages when closing, which can damage the insulation of the disconnect switch itself and adjacent equipment, potentially affecting the stability of the power system. To effectively suppress the impact of transient overvoltages during opening and closing, such as… Figure 1 As shown, a resistor structure for suppressing overvoltage is provided between the upper shield 1 and the lower shield 2 of the stationary contact of the disconnector. The generation of transient overvoltage is suppressed by the auxiliary circuit generated by the resistor contact and the resistor structure at the top of the upper shield.

[0003] The aforementioned resistor structure is a resistor string 4 consisting of resistor pieces 3 mounted on an insulating rod connected in series. Multiple resistor strings 4 can be set up. Because each column of resistor string 4 is composed of multiple resistor pieces 3, each column of resistor string 4 needs to be assembled multiple times to complete the assembly. Furthermore, shims need to be added between the resistor pieces 3 for adjustment during the assembly process. Therefore, the assembly time of this resistor string 4 is relatively long and the process is complex. Moreover, when the disconnecting switch is activated, the resistor pieces 3 will break due to the impact of the moving contact. The resulting debris will scatter between the disconnecting switch and the disconnecting switch housing, thereby reducing the insulation performance between the disconnecting switch and the housing, causing electric field distortion, and resulting in discharge.

[0004] To address this issue, existing technology provides an integrated resistor rod to replace the original resistor string. This integrated resistor rod includes a top connecting flange, a bottom connecting flange for connecting to the connecting flanges at the upper and lower shields, and a resistor rod body located between the top and bottom flanges. It also includes a bottom element located at the center of the bottom connecting flange. When the voltage level of the disconnecting switch is fixed, the length of the integrated resistor rod used in this disconnecting switch is constant. In practice, the distance between the upper and lower shields of the disconnecting switch is increased according to actual usage and assembly requirements. This increased distance makes it impossible to fix the existing fixed-length integrated resistor rod to the lower shield, thus rendering the resistor rod unusable for this disconnecting switch. Utility Model Content

[0005] The purpose of this invention is to provide a resistor structure for the stationary contact of a disconnector, so as to solve the problem that the existing integrated resistor rod cannot be connected and fixed to the lower shield due to the increased distance between the upper and lower shields of the stationary contact of the disconnector.

[0006] The purpose of this utility model is also to provide a stationary contact of a disconnecting switch to solve the problem that the existing integrated resistance rod located between the upper and lower shields of the stationary contact cannot be connected and fixed to the lower shield due to the increased distance between the upper and lower shields.

[0007] To achieve the above objectives, the present invention provides a resistor structure for the stationary contact of a disconnector, employing the following technical solution:

[0008] A resistor structure for a stationary contact of a disconnector includes an integral resistor rod. The resistor structure also includes a conductive support rod connected to the bottom of the integral resistor rod and used for conductive support of the integral resistor rod. The top center of the conductive support rod is provided with a clearance groove for avoiding the bottom components of the integral resistor rod.

[0009] Furthermore, the resistor structure also includes a resistor shielding structure located at the connection between the integrated resistor rod and the conductive support rod.

[0010] Furthermore, the conductive support rod is an I-shaped conductive support rod with an I-shaped vertical cross-section. The I-shaped conductive support rod includes a central support rod and a top connecting plate and a bottom connecting plate vertically disposed at both ends of the central support rod. The top connecting plate of the conductive support rod is connected to the bottom connecting flange of the integrated resistance rod. The resistance shielding structure is disposed at the connection position between the top connecting plate and the bottom connecting flange.

[0011] Furthermore, the resistor shielding structure is a split, spliced, hollow spherical structure symmetrical along the plane containing the central axis of the integrated resistor rod. It has end openings at both ends for the central support rod and the main body of the resistor rod to pass through. Inside, it has a cavity for accommodating the connected top plate connecting plate and the bottom connecting flange. The cavity is also provided with a connecting structure for connecting to the top plate connecting plate.

[0012] Furthermore, the connecting structure includes a flange structure for connecting the top connecting plate, which extends vertically inward along the cavity wall of the cavity. The flange structure forms a central through hole for the central support rod to pass through. The flange structure is provided with a connecting through hole. The connecting structure also includes a threaded mounting hole provided at the position corresponding to the connecting through hole on the top mounting plate.

[0013] Beneficial effects: The resistor structure for the stationary contact of a disconnector switch of this utility model is an improved invention. Specifically, it includes an integrated resistor rod and a conductive support rod at the bottom of the integrated resistor rod. The top of the conductive support rod is provided with a clearance groove for avoiding the bottom components of the integrated resistor plate. By setting a conductive support rod at the bottom of the integrated resistor rod for conductive support, the existing integrated resistor rod can still be connected and fixed to the lower shield with the help of the conductive support rod when the distance between the upper and lower shields of the stationary contact increases. This makes the installation flexibility of the existing integrated resistor rod higher and solves the problem that the existing integrated resistor rod cannot be connected and fixed to the lower shield due to the increase in the distance between the upper and lower shields of the stationary contact.

[0014] To achieve the above objectives, the present invention provides a stationary contact for a disconnecting switch, which adopts the following technical solution:

[0015] A stationary contact of a disconnecting switch includes a resistor structure disposed between and connected to the upper and lower shields of the stationary contact. The resistor structure includes an integral resistor rod and a conductive support rod connected to the bottom of the integral resistor rod for conductive support of the integral resistor rod. The top center of the conductive support rod is provided with a clearance groove for avoiding the bottom components of the integral resistor rod.

[0016] Furthermore, the resistor structure also includes a resistor shielding structure located at the connection between the integrated resistor rod and the conductive support rod.

[0017] Furthermore, the conductive support rod is an I-shaped conductive support rod with an I-shaped vertical cross-section. The I-shaped conductive support rod includes a central support rod and a top connecting plate and a bottom connecting plate vertically disposed at both ends of the central support rod. The top connecting plate of the conductive support rod is connected to the bottom connecting flange of the integrated resistance rod. The resistance shielding structure is disposed at the connection position between the top connecting plate and the bottom connecting flange.

[0018] Furthermore, the resistor shielding structure is a split, spliced, hollow spherical structure symmetrical along the plane containing the central axis of the integrated resistor rod. It has end openings at both ends for the central support rod and the main body of the resistor rod to pass through. Inside, it has a cavity for accommodating the connected top plate connecting plate and the bottom connecting flange. The cavity is also provided with a connecting structure for connecting to the top plate connecting plate.

[0019] Furthermore, the connecting structure includes a flange structure for connecting the top connecting plate, which extends vertically inward along the cavity wall of the cavity. The flange structure forms a central through hole for the central support rod to pass through. The flange structure is provided with a connecting through hole. The connecting structure also includes a threaded mounting hole provided at the position corresponding to the connecting through hole on the top mounting plate.

[0020] Beneficial Effects: The present invention relates to an improved isolating switch stationary contact. Specifically, it includes a resistor structure located between the upper and lower shields of the switch. The resistor structure comprises an existing integrated resistor rod and a conductive support rod located at the bottom of the integrated resistor rod. The top of the conductive support rod has a clearance groove for avoiding the bottom components of the integrated resistor plate. By providing a conductive support rod for conductive support of the integrated resistor rod at the bottom of the integrated resistor rod within the stationary contact, the existing integrated resistor rod can still be connected and fixed to the lower shield with the help of the conductive support rod when the distance between the upper and lower shields of the stationary contact increases. This makes the installation flexibility of the existing integrated resistor rod higher and solves the problem that the existing integrated resistor rod cannot be connected and fixed to the lower shield due to the increased distance between the upper and lower shields of the stationary contact. Attached Figure Description

[0021] Figure 1 A schematic diagram of a resistor string installed on the stationary contact of a disconnector in the prior art;

[0022] Figure 2 This is a cross-sectional view of one embodiment of the resistor structure for the stationary contact of a disconnector according to the present invention;

[0023] Figure 3 for Figure 2 A partial enlarged view of the resistor shielding structure installed at the bottom connecting flange and the top connecting plate of the conductive support rod of the integrated resistor rod.

[0024] Figure 4 for Figure 2 A schematic diagram of the medium-resistance shielding structure;

[0025] Figure 5 for Figure 4 Sectional view along the AA direction;

[0026] Figure 6 for Figure 4 Top view.

[0027] In the diagram: 1. Upper shield; 2. Lower shield; 3. Resistor sheet; 4. Resistor string; 5. Resistor structure; 51. Integrated resistor rod; 52. Conductive support rod; 6. Resistor shielding structure; 61. End opening; 7. Bottom component; 8. Clearance groove; 9. Top connecting plate; 91. Connecting threaded hole; 10. Bottom connecting plate; 11. Central support rod; 12. Bottom connecting flange; 14. Accommodating cavity; 15. Flange structure; 16. Resistor rod body; 17. Connecting through hole; 18. Mounting threaded hole; 19. Top connecting flange; 20. Bottom connecting through hole. Detailed Implementation

[0028] This invention provides a supporting conductive rod at the bottom of the existing integrated resistor rod, so that even when the distance between the upper and lower shields of the stationary contact of the disconnector increases, this integrated resistor rod can still be installed and used between the upper and lower shields of the stationary contact.

[0029] Based on the above ideas, such as Figure 2 As shown, the resistive structure for the stationary contact of a disconnector according to this utility model includes an integral resistor rod 51 and a conductive support rod 52 connected to the bottom of the integral resistor rod 51 for conductive support. A clearance groove 8 is provided at the top center of the conductive support rod 52 to avoid the bottom component 7 of the integral resistor rod 51. To uniformly distribute the electric field at the bottom connecting flange 12 of the integral resistor rod 51, the resistive structure 5 also includes a resistive shielding structure 6 located at the connection between the integral resistor rod 51 and the conductive support rod 52.

[0030] In a preferred embodiment, to improve the support performance of the conductive support rod 52, the conductive support rod 52 is an I-shaped conductive support rod with a vertical cross-section. The I-shaped conductive support rod includes a central support rod 11 and a top connecting plate 9 and a bottom connecting plate 10 vertically disposed at both ends of the central support rod 11. A resistor shielding structure 6 is disposed at the connection position between the top connecting plate 9 and the bottom connecting flange 12. The resistor shielding structure 6 is used to optimize the distorted electric field at the connection between the bottom connecting flange 12 of the integrated resistor rod 51 and the top connecting plate 9 of the conductive support rod 52, and improve the distribution of the electric field inside the disconnecting switch. In the prior art, the top connecting flange 19 of the integrated resistor rod 51 is connected to the connecting flange of the upper shield of the stationary contact, and the bottom connecting flange 12 is connected to the connecting flange of the lower shield of the stationary contact. When the resistor structure 5 is fixed, the resistor structure 5 is connected to the connecting flange of the upper shield 1 through the top connecting flange 19 of the integrated resistor rod 51, and to the connecting flange of the lower shield 2 through the bottom connecting plate 10 of the conductive support rod 52. The bottom connecting plate 10 is provided with a bottom connecting through hole 20. The threaded fastener passes through the bottom connecting through hole 20 and is screwed into the threaded hole on the lower shield 2, thereby connecting the bottom of the resistor structure 5 to the lower shield 2.

[0031] like Figure 2-3 As shown, the top connecting plate 9 of the conductive support rod 52 is provided with a threaded hole 91. A threaded fastener passes through the through hole on the bottom connecting flange 12 and is screwed into the threaded hole 91 of the top connecting plate 9, thereby fixing the top connecting plate 9 and the bottom connecting flange 12 together. In other embodiments, the conductive support rod 52 can also be a cylindrical conductive rod, with its top surface connected to the bottom connecting flange 12 of the integrated resistance rod 51.

[0032] like Figure 4-6As shown, the resistor shielding structure 6 is a split hollow spherical structure with openings at both ends, including two hemispherical shells symmetrical along the central cross-section of the integral resistor rod 51. The central support rod 11 and the resistor rod body 16 pass through the end openings 61 at both ends. Its interior has a receiving cavity 14 for accommodating the connected top plate connecting plate 9 and the bottom connecting flange 12. The receiving cavity 14 is provided with a connecting structure for connecting to the top plate connecting plate 9.

[0033] The connecting structure includes a flange structure 15 extending vertically inward along the cavity wall of the accommodating cavity 14 for connecting the top connecting plate. A central through hole formed by the flange structure 15 allows the central support rod 11 to pass through. The flange structure 15 has a connecting through hole 17. The connecting structure also includes a threaded mounting hole 18 located at the bottom of the top connecting plate 9 corresponding to the connecting through hole 17. A threaded fastener passes through the connecting through hole 17 and is screwed into the threaded mounting hole 18, thereby fixing the resistor shielding structure 6 to the top connecting plate 9. In other embodiments, the connecting structure may also include a groove on the circumferential side of the top mounting plate 9 and a flange perpendicular to the inner wall of the cavity 14. During installation, the resistor shielding structure 6 inserts and adheres the flange located within its cavity into the groove of the top mounting plate 9, thereby fixing it to the top mounting plate 9. In other embodiments, the resistor shielding structure 6 can also be a split thin-walled hollow spherical shell with a thin-walled flange extending inward along the shell wall. The thin-walled flange has a through hole. During installation, the thin-walled flange is inserted between the mounting surfaces of the bottom connecting flange 12 and the top mounting plate 9, and the through hole on the thin-walled flange is aligned with the connecting threaded hole 91 on the top mounting plate 91. Then, the threaded fasteners are passed through the through holes on the bottom connecting flange 12 and the thin-walled flange in sequence and screwed into the connecting threaded hole 91 of the top mounting plate 9, thereby connecting and fixing the bottom connecting flange 12, the resistor shielding structure 6 and the top mounting plate 9.

[0034] This utility model also provides a stationary contact of an isolating switch, including a resistor structure 5 disposed between a shielding cover 1 and a lower shielding cover 2 on the stationary contact and connected to the upper and lower shielding covers. The resistor structure 5 includes an integral resistor rod 51 and a conductive support rod 52 connected to the bottom of the integral resistor rod 51 and used for conductive support of the integral resistor rod 51. The top center of the conductive support rod 52 of the integral resistor rod 51 is provided with a clearance groove 8 for avoiding the bottom components of the integral resistor rod 51. The technical solution of the resistor structure 5 has been described above and will not be repeated here.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A resistive structure for the stationary contact of a disconnector switch, comprising an integral resistance rod, characterized in that, The resistor structure also includes a conductive support rod connected to the bottom of the integrated resistor rod and used for conductive support of the integrated resistor rod, wherein the top center of the conductive support rod is provided with a clearance groove for avoiding the bottom components of the integrated resistor rod.

2. The resistive structure for the stationary contact of a disconnector according to claim 1, characterized in that, The resistor structure also includes a resistor shielding structure located at the connection between the integrated resistor rod and the conductive support rod.

3. The resistive structure for the stationary contact of a disconnector according to claim 2, characterized in that, The conductive support rod is an I-shaped conductive support rod with a vertical cross-section. The I-shaped conductive support rod includes a central support rod and a top connecting plate and a bottom connecting plate vertically arranged at both ends of the central support rod. The top connecting plate of the conductive support rod is connected to the bottom connecting flange of the integrated resistance rod. The resistance shielding structure is located at the connection position between the top connecting plate and the bottom connecting flange.

4. The resistive structure for the stationary contact of a disconnector according to claim 3, characterized in that, The resistor shielding structure is a split, spliced, hollow spherical structure symmetrical along the plane of the central axis of the integrated resistor rod. It has end openings at both ends for the central support rod and the main body of the resistor rod to pass through. Inside, it has a cavity for accommodating the connected top plate connecting plate and the bottom connecting flange. The cavity is also provided with a connecting structure for connecting to the top plate connecting plate.

5. The resistive structure for the stationary contact of a disconnector according to claim 4, characterized in that, The connecting structure includes a flange structure that extends vertically inward along the cavity wall of the cavity to connect to the top connecting plate. The flange structure forms a central through hole for the central support rod to pass through. The flange structure has a connecting through hole. The connecting structure also includes a threaded mounting hole on the top mounting plate at a position corresponding to the connecting through hole.

6. A stationary contact of a disconnecting switch, comprising a resistive structure disposed between and connected to the upper and lower shielding covers of the stationary contact, characterized in that, The resistor structure includes an integral resistor rod and a conductive support rod connected to the bottom of the integral resistor rod for conductive support of the integral resistor rod. The top center of the conductive support rod is provided with a clearance groove for avoiding the bottom components of the integral resistor rod.

7. The stationary contact of the disconnector according to claim 6, characterized in that, The resistor structure also includes a resistor shielding structure located at the connection between the integrated resistor rod and the conductive support rod.

8. The stationary contact of the disconnector according to claim 7, characterized in that, The conductive support rod is an I-shaped conductive support rod with a vertical cross-section. The I-shaped conductive support rod includes a central support rod and a top connecting plate and a bottom connecting plate vertically arranged at both ends of the central support rod. The top connecting plate of the conductive support rod is connected to the bottom connecting flange of the integrated resistance rod. The resistance shielding structure is located at the connection position between the top connecting plate and the bottom connecting flange.

9. The stationary contact of the disconnector according to claim 8, characterized in that, The resistor shielding structure is a split, spliced, hollow spherical structure symmetrical along the plane of the central axis of the integrated resistor rod. It has end openings at both ends for the central support rod and the main body of the resistor rod to pass through. Inside, it has a cavity for accommodating the connected top plate connecting plate and the bottom connecting flange. The cavity is also provided with a connecting structure for connecting to the top plate connecting plate.

10. The stationary contact of the disconnector according to claim 9, characterized in that, The connecting structure includes a flange structure that extends vertically inward along the cavity wall of the cavity to connect to the top connecting plate. The flange structure forms a central through hole for the central support rod to pass through. The flange structure has a connecting through hole. The connecting structure also includes a threaded mounting hole at the corresponding position of the top mounting plate and the connecting through hole.

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