Vacuum pouring cushion block for 110kV dry-type transformer

Abstract

The utility model relates to the technical field of transformer cushion blocks, and provides a vacuum pouring cushion block for a 110kV dry-type transformer, which comprises a resin cushion block body, a first top surface is arranged at the top of the resin cushion block body; the first top surface is provided with a first platform, a second platform and a first clamping groove; the first clamping groove is located between the first platform and the second platform. A lug boss is arranged at the front end of the resin cushion block body; a second top surface is arranged at the top of the lug boss; the second top surface is lower than the first top surface; a second clamping groove is formed in the second top surface; and umbrella skirts are arranged at the rear end and two side surfaces of the resin cushion block body. According to the resin cushion block, the protruding part is arranged at the front end of the resin cushion block body, the second clamping groove is formed in the top of the protruding part and used for installing the low-voltage insulating cylinder located between the iron core and the low-voltage coil, insulation failure caused by discharge breakdown of the low-voltage coil of the 110 kV dry type transformer to the iron core can be effectively avoided, and market requirements are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer pads, and in particular relates to a vacuum casting pad for a 110kV dry-type transformer. Background Art

[0002] When assembling the existing dry-type transformer coil, the pad is first supported by the pad, and then the safety distance between the low-voltage coil and the core column, and between the high-voltage coil and the low-voltage coil is adjusted, and then the pad is pressed between the high-voltage coil and the low-voltage coil to ensure the safety distance. For example, the insulating pad proposed in the patent document with publication number CN217181983U is provided with a slot for installing a high-voltage insulating cylinder located between the high-voltage coil and the low-voltage coil.

[0003] But for 110kV dry-type transformers, the withstand voltage performance between the iron core and the low-voltage coil needs to be considered. Therefore, a low-voltage insulation cylinder needs to be installed between the low-voltage coil and the iron core. Otherwise, the discharge of the low-voltage coil to the iron core will break through the insulation layer between the two, causing insulation failure. However, the traditional spacer lacks a structure for installing the low-voltage insulation cylinder. Therefore, a new insulation spacer suitable for 110kV dry-type transformers is needed. Utility Model Content

[0004] In view of the above problems in the prior art, the present application proposes a vacuum cast pad for a 110kV dry-type transformer, which effectively avoids insulation failure by adding a slot for a low-voltage insulation cylinder.

[0005] The utility model proposes a vacuum casting pad for a 110kV dry-type transformer, comprising a resin pad body; a first top surface is arranged on the top of the resin pad body; a first platform, a second platform and a first slot are arranged on the first top surface; the first slot is located between the first platform and the second platform; a protrusion is arranged on the front end of the resin pad body; a second top surface is arranged on the top of the protrusion; the second top surface is lower than the first top surface; the second top surface is arranged with a second slot; and umbrella skirts are arranged on the rear end and two side surfaces of the resin pad body.

[0006] Furthermore, the second slot is an arc-shaped slot.

[0007] Furthermore, the resin pad body, the raised portion and the umbrella skirt are integrally formed.

[0008] Furthermore, there are a plurality of the first card slots, and the plurality of the first card slots are arranged at intervals.

[0009] Furthermore, positioning holes are respectively provided on the first platform and the second platform.

[0010] Furthermore, there are a plurality of the second card slots, and the plurality of the second card slots are arranged at intervals.

[0011] Furthermore, one end of the umbrella skirt on the side surface of the resin pad body extends to the protruding portion.

[0012] Furthermore, at least one umbrella skirt is provided between the first card slot and the second top surface.

[0013] Furthermore, the wall surfaces of the first card slot and the second card slot are inclined surfaces.

[0014] Furthermore, a positioning groove is provided at the bottom of the resin pad body.

[0015] The beneficial effects of the utility model are as follows: by providing a protrusion at the front end of the resin gasket body and providing a second slot on the top of the protrusion for installing a low-voltage insulation cylinder between the iron core and the low-voltage coil, the low-voltage coil of the 110kV dry-type transformer can be effectively prevented from discharging and breaking down the iron core, causing insulation failure, thereby meeting market demand. The first slot is used to install a high-voltage insulation cylinder between the low-voltage coil and the high-voltage coil. Under the action of the first slot and the second slot, the displacement of the resin gasket body, the coil and the iron core is effectively limited, thereby improving the quality of the transformer product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a three-dimensional structural schematic diagram of a vacuum casting pad for a 110kV dry-type transformer.

[0017] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure from another perspective.

[0018] Figure 3 This is a front view of a vacuum cast pad for a 110kV dry-type transformer of the utility model.

[0019] Figure 4 for Figure 3 Schematic side view of .

[0020] Figure 5 for Figure 4 Schematic top view of .

[0021] In the figure, 10 is a resin pad body; 11 is a first platform; 12 is a second platform; 13 is a first slot; 14 is a raised portion; 15 is a second slot; 16 is a positioning hole; 17 is an umbrella skirt; and 18 is a positioning groove. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 5 The utility model is further described in detail with specific embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3 The vacuum casting gasket for the 110kV dry-type transformer shown in the figure comprises a resin gasket body 10; a first top surface is arranged on the top of the resin gasket body 10; a first platform 11, a second platform 12 and a first slot 13 are arranged on the first top surface; the first slot 13 is located between the first platform 11 and the second platform 12; a protrusion 14 is arranged on the front end of the resin gasket body 10; a second top surface is arranged on the top of the protrusion 14; the second top surface is lower than the first top surface; a second slot 15 is arranged on the second top surface; an umbrella skirt 17 is arranged on the rear end and two side surfaces of the resin gasket body 10.

[0024] The resin pad body 10, the raised portion 14 and the umbrella skirt 17 of the present embodiment are integrally formed, and are all integrally formed by vacuum casting.

[0025] The 110kV dry-type transformer includes an iron core, a low-voltage coil and a high-voltage coil which are arranged in sequence from the inside to the outside; wherein a low-voltage insulating cylinder is arranged between the iron core and the low-voltage coil, and a high-voltage insulating cylinder is arranged between the low-voltage coil and the high-voltage coil.

[0026] The first card slot 13 is used to install the high-voltage insulation cylinder between the low-voltage coil and the high-voltage coil. The second card slot 15 is used to install the low-voltage insulation cylinder between the iron core and the low-voltage coil.

[0027] By setting a protrusion 14 at the front end of the resin gasket body 10 and setting a second slot 15 at the top of the protrusion 14 for installing a low-voltage insulating cylinder located between the iron core and the low-voltage coil, the insulation failure caused by the discharge and breakdown of the low-voltage coil of the 110kV dry-type transformer on the iron core can be effectively avoided, thereby meeting market demand.

[0028] Under the action of the first clamping groove 13 and the second clamping groove 15, the displacement of the resin spacer body 10, the coil and the iron core is effectively restricted, thereby improving the product quality of the transformer.

[0029] like Figure 4 As shown, there are multiple first card slots 13, and the multiple first card slots 13 are arranged at intervals. In this embodiment, there are four first card slots 13, and correspondingly, the high-voltage insulation cylinder can adopt a four-layer structure, and the end of the high-voltage insulation cylinder is inserted into the first card slot 13. If the high-voltage insulation cylinder adopts a three-layer structure, the corresponding first card slots 13 can be set to three.

[0030] Positioning holes 16 are provided on the first platform 11 and the second platform 12, respectively. The positioning holes 16 are used to position the buffer pads installed on the first platform 11 and the second platform 12. Before the end face of the low-voltage coil contacts the first platform 11, a buffer pad is installed on the first platform 11, and the buffer pad is positioned and fixed through the positioning holes 16 on the first platform 11. After the buffer pad is installed on the first platform 11, the end face of the low-voltage coil contacts the buffer pad. Similarly, before the end face of the high-voltage coil contacts the second platform 12, a buffer pad is also installed on the second platform 12, and the buffer pad is positioned and fixed through the positioning holes 16 on the second platform 12. After the buffer pad is installed on the second platform 12, the end face of the high-voltage coil contacts the buffer pad. In practice, the low-voltage coil and the high-voltage coil should be contacted after the installation of the buffer pads is completed on both the first platform 11 and the second platform 12.

[0031] like Figure 5 As shown, the second card slot 15 is an arc-shaped slot. There are multiple second card slots 15, and the multiple second card slots 15 are arranged at intervals. In this embodiment, there are two second card slots 15, and the two second card slots 15 are arranged at intervals along the radial direction of the arc-shaped slot. Figure 1 , Figure 5 As shown, the end surface of the front end of the resin spacer body 10 where the protrusion 14 is not provided is an arc surface, which is used to contact the outer wall of the low-voltage insulation cylinder.

[0032] The walls of the first and second slots 13 and 15 are inclined surfaces. Since the resin pad body 10, the protrusion 14 and the umbrella skirt 17 of this embodiment are integrally formed by vacuum casting, the inner walls of the first and second slots 13 and 15 are both provided with inclined surfaces for easy demoulding, and the vertical section of the umbrella skirt 17 is also triangular.

[0033] like Figure 1 , Figure 4 As shown in FIG. 1 , one end of the shed 17 on the side of the resin spacer body 10 extends to the raised portion 14. Figure 4 As shown, the resin pad body 10 is provided with at least one shed 17 between the horizontal plane where the bottom of the first slot 13 is located and the horizontal plane where the second top surface is located. Figure 2 As shown, a positioning groove 18 is provided at the bottom of the resin gasket body 10. The positioning groove 18 is used for installing and positioning the vacuum casting gasket in the transformer and can also limit the lateral displacement of the vacuum casting gasket.

[0034] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A vacuum casting pad for a 110kV dry-type transformer, characterized in that: It includes a resin pad body; a first top surface is arranged on the top of the resin pad body; a first platform, a second platform and a first slot are arranged on the first top surface; the first slot is located between the first platform and the second platform; a protrusion is arranged on the front end of the resin pad body; a second top surface is arranged on the top of the protrusion; the second top surface is lower than the first top surface; a second slot is arranged on the second top surface; umbrella skirts are arranged on the rear end and two side surfaces of the resin pad body.

2. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1 is characterized in that: The second slot is an arc-shaped slot.

3. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: The resin pad body, the raised portion and the umbrella skirt are integrally formed.

4. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: There are a plurality of first card slots, and the plurality of first card slots are arranged at intervals.

5. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: Positioning holes are respectively provided on the first platform and the second platform.

6. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: There are a plurality of the second card slots, and the plurality of the second card slots are arranged at intervals.

7. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: One end of the shed on the side surface of the resin pad body extends to the protruding portion.

8. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: At least one umbrella skirt is arranged between the first clamping slot and the second top surface.

9. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: The wall surfaces of the first card slot and the second card slot are inclined surfaces.

10. The vacuum casting spacer for a 110kV dry-type transformer according to claim 1, characterized in that: A positioning groove is arranged at the bottom of the resin pad body.

Images