A grading insulator for an environmentally friendly gas-insulated switchgear

Abstract

The utility model discloses a kind of equalizing insulation for environmental protection gas insulated cabinet, including insulating layer, first insert and second insert, the first insert is set in the first end of the insulating layer, the second insert is set in the second end of the insulating layer, and the axis of first insert and second insert coincides with the axis of insulating layer, one end of the first insert and one end of the second insert are embedded in the insulating layer respectively, and the other end extends to the outside of the insulating layer;The insulating layer is spindle structure, the cross section diameter gradually decreases along its axis direction from middle to both ends, and the outside surface of insulating layer is continuous smooth arc surface.The utility model, excellent insulating property, its insulating layer surface electric field evenly distributes, can avoid local electric field too strong, reduce the risk of creeping and surface flashover.

Description

Technical Field

[0001] This utility model relates to the field of switchgear insulators, and in particular to an equalizing insulator for environmentally friendly gas-insulated switchgear. Background Technology

[0002] An insulator is a layer of electrical insulation installed between conductors at different potentials in a switchgear. Insulators used in switchgear are mostly epoxy resin cast composite insulators. Insulators, located at different positions within the switchgear, serve to withstand voltage and mechanical stress. At different voltage levels, the height of the insulator and the skirt on its outer surface are increased to meet the insulation levels required for the corresponding voltage levels as specified in GB / T 3906 and GB / T 11022.

[0003] Currently, SF6 gas-insulated switchgear (GIS) primarily uses epoxy resin-cast basin insulators, three-post insulators, and single-post insulators. Replacing traditional SF6 gas with dry air as the environmentally friendly insulating gas in GIS represents the mainstream development direction for future medium- and high-voltage switchgear. While traditional basin insulators offer advantages in insulation, support, and gas chamber isolation within SF6 gas switchgear, their application in dry-air environmentally friendly gas switchgear presents challenges such as high cost, poor structural compatibility, significant impact on insulation reliability due to the substitute gas, potential for localized electric field exceedances, and increased insulation risks. Therefore, they cannot be directly used in dry-air gas-insulated switchgear. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing an equalizing insulator for environmentally friendly gas-insulated cabinets. It has excellent insulation performance, and the electric field on the surface of its insulation layer is uniformly distributed, which can avoid excessive local electric field and reduce the risk of creepage and surface flashover.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an equalizing insulator for an environmentally friendly gas-insulated cabinet, comprising an insulating layer, a first insert and a second insert, wherein the first insert is disposed at a first end of the insulating layer, one end of the first insert and one end of the second insert are respectively embedded in the insulating layer, and the other end extends to the outside of the insulating layer; the insulating layer has a spindle structure, the diameter of its cross-section gradually decreases from the middle to both ends along its axial direction, and the outer surface of the insulating layer is a continuous smooth arc-shaped surface.

[0006] Furthermore, the end face of the first end of the insulating layer is parallel to the end face of the second end.

[0007] Furthermore, the minimum cross-sectional diameter of the first end of the insulating layer is greater than the minimum cross-sectional diameter of the second end of the insulating layer; the diameter of the first insert is greater than the diameter of the second insert.

[0008] Furthermore, it also includes a third insert and a fourth insert, wherein the third insert is fixedly connected to the other end of the first insert, and the fourth insert is fixedly connected to the other end of the second insert.

[0009] Furthermore, the third and fourth inserts are rotatably connected to a transmission component via a bearing structure, and the end of the transmission component away from the insulating layer is provided with a gear.

[0010] Furthermore, the insulating layer is formed by epoxy resin casting.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The insulating layer of this utility model has a spindle structure, and its shape is similar to the field strength contour distribution of an ideal spherical gap electric field. This makes the electric field on the surface of the insulating layer uniformly distributed, which can avoid excessive local electric field, reduce the risk of creepage and surface flashover, and improve insulation performance.

[0013] 2. The third and fourth inserts are rotatably connected to a transmission component via bearings. The end of the transmission component away from the insulation layer is provided with a gear, which enables the equalizing insulator to have a transmission function. This transmission method replaces the traditional transmission method of the insulating screw, avoiding the discharge and creepage phenomena that occur when the traditional insulating screw is used in the tank-type environmentally friendly gas insulation cabinet.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the voltage equalizing insulator for environmentally friendly gas-insulated cabinets of the present invention is not limited to the embodiments. Attached Figure Description

[0015] Figure 1 This is a front view (internal perspective of the insulating layer) of Embodiment 1 of this utility model.

[0016] Figure 2 This is a schematic diagram of the voltage equalization and shielding function of Embodiment 1 of this utility model;

[0017] Figure 3 This is the front view (internal perspective of the insulating layer) of Embodiment 2 of this utility model.

[0018] Figure 4 This is a schematic diagram of the voltage equalization and shielding function of Embodiment 2 of this utility model;

[0019] Figure 5 This is a three-dimensional structural schematic diagram of embodiment three of this utility model;

[0020] In the figure: 1. Insulating layer; 2. First insert; 21. First large rounded corner end; 22. First connecting end; 23. First spherical end; 3. Second insert; 31. Second large rounded corner end; 32. Second connecting end; 33. Second spherical end; 4. Third insert; 5. Fourth insert; 6. Bearing structure; 7. Transmission component; 71. Gear; 8. High-potential conductor; 81. Protrusion; 9. Low-potential conductor. Detailed Implementation

[0021] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] Example 1

[0024] Please see Figure 1As shown, this utility model discloses an equalizing insulator for an environmentally friendly gas-insulated cabinet, comprising an insulating layer 1, a first insert 2, and a second insert 3. The first insert 2 is disposed at a first end of the insulating layer 1, and the second insert 3 is disposed at a second end of the insulating layer 1. The axes of the first insert 2 and the second insert 3 coincide with the axis of the insulating layer 1. One end of the first insert 2 and one end of the second insert 3 are respectively embedded in the insulating layer 1, and the other end extends outside the insulating layer 1. The insulating layer 1 has a spindle structure, and its cross-sectional diameter gradually decreases from the middle to both ends along its axis. The outer surface of the insulating layer 1 is a continuous smooth arc-shaped surface. Specifically, the insulating layer 1 is cast from epoxy resin. The spindle structure is a geometric body formed by rotating a smooth arc curve around the axis of the insulating layer 1. The end face of the first end of the insulating layer 1 is parallel to the end face of the second end.

[0025] The minimum cross-sectional diameter of the first end of the insulating layer 1 is greater than the minimum cross-sectional diameter of the second end of the insulating layer 1. The size of the first insert 2 is greater than the size of the second insert 3, that is, the first insert 2 is the high potential end and the second insert 3 is the low potential end.

[0026] In this embodiment, one end of the first insert 2 and one end of the second insert 3 are respectively large rounded corner ends, and the other ends of the first insert 2 and the second insert 3 are respectively connecting ends. The large rounded corner ends of both are embedded in the insulating layer 1, and the connecting ends extend outside the insulating layer 1. The large rounded corner ends are geometric shapes formed by rotating a smooth arc curve around the axis of the insulating layer 1. This arc curve consists of two arc segments, with the arc segment farther from the connecting end having a larger radius and the arc segment closer to the connecting end having a smaller radius. Specifically, the connecting ends of the first insert 2 and the second insert 3 are respectively cylindrical, and the transition area between the large rounded corner ends and the connecting ends has a smooth transition arc surface. However, the structure of the first insert 2 and the second insert 3 is not limited to this.

[0027] The maximum lateral distance between the large rounded corners of the first insert 2 and the second insert 3 can naturally shield the three-interface region of the insulating layer 1, avoiding the technical problems of surface flashover and partial discharge caused by the easy accumulation of charge and the presence of interface polarization effect in this region.

[0028] For ease of distinction, the large rounded corner end of the first insert 2 is named the first large rounded corner end 21, and the connecting end is named the first connecting end 22. The large rounded corner end of the second insert 3 is named the second large rounded corner end 31, and the connecting end is named the second connecting end 32. The size of the first large rounded corner end 21 of the first insert 2 is larger than the size of the second large rounded corner end 31 of the second insert 3. Similarly, the size of the first connecting end 22 of the first insert 2 (i.e., the diameter of the cylinder) is also larger than the size of the second connecting end 32 of the second insert 3 (i.e., the diameter of the cylinder). Specifically, the distance between the first large rounded corner end 21 and the second large rounded corner end 31, the curvature of the outer surface of the insulating layer 1, and the sizes of the insulating layer 1, the first large rounded corner end 21, and the second large rounded corner end 31 can be adjusted according to requirements.

[0029] This utility model also includes a third insert 4 and a fourth insert 5. The third insert 4 is fixedly connected to the other end (i.e., the first connecting end 22) of the first insert 2, and the fourth insert 5 is fixedly connected to the other end (i.e., the second connecting end 32) of the second insert 3, so as to connect with other components through the third insert 4 and the fourth insert 5. Specifically, the structure of the third insert 4 and the fourth insert 5 can be adjusted according to the installation position and the required function.

[0030] When voltage-equalizing insulators are required for voltage-equalizing shielding, multiple voltage-equalizing insulators are fixed at a specific installation angle (based on the electrode shape) at the desired voltage-equalizing shielding location to achieve the voltage-equalizing shielding function. No additional equipment is required, thus avoiding increased costs. Specifically, as follows... Figure 2 As shown, the high-potential conductor 8 and the low-potential conductor 9 are coaxially arranged, and their electric field distribution is a slightly non-uniform electric field. When there is any protrusion 81 on the high-potential conductor 8, it no longer satisfies the slightly non-uniform electric field distribution. Insulators are installed on both sides of the protrusion 81 for voltage equalization shielding. Even if the first insert 2 of the two voltage equalization insulators is connected to the high-potential conductor 8 through the third insert 4, and the second insert 3 is connected to the low-potential conductor 9 through the fourth insert 5, the two first inserts 2 make it possible for... Figure 2 The area enclosed by the dashed line is at the same potential, achieving voltage equalization and shielding, which utilizes the principle of electrostatic shielding. In practical applications, such as compact tank-type environmentally friendly gas-insulated cabinets, the main busbar often uses a tubular structure, forming an electric field between coaxial cylindrical electrodes with the gas tank. When conductors of different shapes need to be installed on the main busbar (e.g., grounding switch static contacts), a highly non-uniform electric field is formed. Traditional insulators do not possess the functions of voltage equalization and shielding insulation, requiring the installation of other primary equipment, leading to increased costs. However, using the voltage equalization insulator of this invention for support and isolation can simultaneously provide voltage equalization and shielding functions, eliminating the need for other primary equipment and avoiding increased costs.

[0031] This utility model discloses an equalizing insulator for an environmentally friendly gas-insulated cabinet. The insulation layer 1 has a spindle structure, and its shape is similar to the field strength contour distribution of an ideal spherical gap electric field. This makes the electric field on the surface of the insulation layer 1 uniformly distributed, which can avoid excessive local electric field and reduce the risk of creepage and surface flashover.

[0032] This utility model discloses an equalizing insulator for environmentally friendly gas-insulated cabinets, which has reliable electrical performance and meets the insulation level requirements of GB / T 3906 and GB / T 11022.

[0033] Example 2

[0034] Please see Figure 3 As shown, the equalizing insulator for an environmentally friendly gas-insulated cabinet according to this utility model differs from Embodiment 1 in that one end of the first insert 2 and one end of the second insert 3 are both spherical ends, and the transition area between the spherical ends and the connecting ends of both has a smooth transition arc surface. For ease of distinction, the spherical end of the first insert 2 is named the first spherical end 23, and the spherical end of the second insert 3 is named the second spherical end 33. The diameter of the first spherical end 21 of the first insert 2 is larger than the diameter of the second spherical end 31 of the second insert 3.

[0035] Similarly, such as Figure 4 As shown, when there are any protrusions 81 on the high-potential conductor 8, it no longer satisfies the slightly non-uniform electric field distribution. Insulators are installed on both sides of the protrusions 81 for voltage equalization shielding. Even if the first insert 2 of the two voltage equalization insulators is connected to the high-potential conductor 8 through the third insert 4, and the second insert 3 is connected to the low-potential conductor 9 through the fourth insert 5, the two first inserts 2 make it possible for... Figure 4 The area enclosed by the dashed line is at the same potential, thus achieving the function of equal voltage shielding, which utilizes the principle of electrostatic shielding.

[0036] Similarly, the maximum diameter of the spherical ends of the first insert 2 and the second insert 3 can naturally shield the three-interface region of the insulating layer 1, avoiding the technical problems of surface flashover and partial discharge caused by the easy accumulation of charge and the presence of interface polarization effect in this region.

[0037] Since the first insert 2 and the second insert 3 are provided with spherical ends, that is, spherical electrodes are used, a spherical gap electric field can be formed, which is a slightly non-uniform electric field. This increases the radius of curvature of the electrode, improves the edge of the electrode, makes the electric field distribution in the insulating layer 1 uniform, and improves the breakdown field strength of the gap. The spherical end can reduce the maximum field strength inside the insulating layer 1, slow down the aging rate of the insulating material, and improve the reliability of the insulating layer 1. Furthermore, the spherical end, in combination with the spindle structure of the insulating layer 1, can make the surface electric field of the insulating layer 1 optimal.

[0038] Example 3

[0039] Please see Figure 5 As shown, the equalizing insulator for an environmentally friendly gas-insulated cabinet according to this utility model differs from Embodiments 1 and 2 in that the third insert 4 and the fourth insert 5 are rotatably connected to a transmission member 7 via a bearing structure 6. A gear 71 is provided at the end of the transmission member 7 away from the insulating layer 1, enabling the insulator to have a transmission function. The gear 71 on the transmission member 7 is used to mesh with gears of other components in the environmentally friendly gas-insulated cabinet to achieve the transmission function.

[0040] Because tank-type environmentally friendly gas-insulated cabinets have a compact structure, the main busbar often adopts a tubular structure, forming an electric field between coaxial cylindrical electrodes with the gas box. However, when there is an insulating rod with transmission function between the two electrodes, surface discharge is prone to occur, increasing the insulation risk. The transmission method of the equalizing insulator in this invention replaces the traditional transmission method of the insulating rod, which can avoid the discharge and creepage phenomena that occur when the traditional insulating rod is used in tank-type environmentally friendly gas-insulated cabinets.

[0041] This utility model provides an equalizing insulator for an environmentally friendly gas-insulated cabinet. The parts not covered herein are the same as or can be implemented using existing technologies.

[0042] The above embodiments are only used to further illustrate the equalizing insulator for environmentally friendly gas-insulated cabinets of this utility model. However, this utility model is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of the technical solution of this utility model.

Claims

1. A voltage equalizing insulator for an environmentally friendly gas-insulated cabinet, comprising an insulating layer, a first insert, and a second insert, wherein the first insert is disposed at a first end of the insulating layer, the second insert is disposed at a second end of the insulating layer, and the axes of the first insert and the second insert coincide with the axis of the insulating layer; one end of the first insert and one end of the second insert are respectively embedded in the insulating layer, and the other ends extend outside the insulating layer; characterized in that: The insulating layer has a spindle-shaped structure, with its cross-sectional diameter gradually decreasing from the middle to both ends along its axial direction, and the outer surface of the insulating layer is a continuous smooth arc-shaped surface.

2. The equalizing insulator for an environmentally friendly gas-insulated cabinet according to claim 1, characterized in that: The end face of the first end of the insulating layer is parallel to the end face of the second end.

3. The equalizing insulator for an environmentally friendly gas-insulated cabinet according to claim 1, characterized in that: The minimum cross-sectional diameter of the first end of the insulating layer is greater than the minimum cross-sectional diameter of the second end of the insulating layer; the size of the first insert is greater than the size of the second insert.

4. The equalizing insulator for an environmentally friendly gas-insulated cabinet according to claim 1, characterized in that: It also includes a third insert and a fourth insert, wherein the third insert is fixedly connected to the other end of the first insert, and the fourth insert is fixedly connected to the other end of the second insert.

5. The equalizing insulator for an environmentally friendly gas-insulated cabinet according to claim 4, characterized in that: The third and fourth inserts are rotatably connected to a transmission component via a bearing structure, and a gear is provided at the end of the transmission component away from the insulating layer.

6. The equalizing insulator for an environmentally friendly gas-insulated cabinet according to claim 1, characterized in that: The insulating layer is formed by casting epoxy resin.

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