Novel method for optimizing internal ground potential of transformer oil tank

Abstract

The invention relates to a novel transformer oil tank internal ground potential optimization method. The optimization method comprises the following installation steps that S1, a layer of semi-conductive paper is laid on the surface of a lower insulating paperboard; s2, laying double-sided gluing paper in the semi-conductive paper in the S1; s3, uniformly laying a plurality of groups of vertical copper strips on the double-sided gluing paper, laying a horizontal copper strip to connect the plurality of groups of vertical copper strips into a whole, and then leading out a grounding lead; according to the optimization method, gluing paper is laid on the inner sides of an upper layer insulating paper board and a lower layer insulating paper board, copper strips and semi-conductive paper which are evenly arranged are placed between the upper layer insulating paper board and the lower layer insulating paper board, one point of the ground potential board is grounded after overall hot press molding, and the new ground potential board effectively avoids the situation that due to different shrinkage rates of all materials, the ground potential board cannot be damaged. The situation that the internal electric field is affected by deformation of the ground electrode due to displacement, wrinkling and local protrusion of the material after overall drying is avoided, and the quality of the ground potential plate in the oil tank is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a novel method for optimizing the internal ground potential of a transformer oil tank. Background Art

[0002] Transformers are an important part of the power system. The safe and stable operation of transformers directly affects the safety of the power grid and even economic development. With the development of the power system, the capacity and voltage level of transformers continue to increase, but the external dimensions of transformers cannot be expanded indefinitely due to transportation restrictions. How to ensure the electrical safety between the body, leads and tank ground potential of large-capacity, high-voltage transformers has become one of the difficulties in transformer design.

[0003] When designing conventional transformers, most of them adopt the method of laying flat conductive materials on insulating cardboard, tying them inside the oil tank and grounding them at one point with the oil tank to form a flat ground potential plate to reduce the field strength of the ground potential. However, due to the different shrinkage rates of the conductive material and the insulating cardboard, the conductive material is prone to displacement, wrinkling and local bulging after overall drying. If the location corresponds to the high voltage area of ​​the transformer, it is very easy to cause a breakdown accident. At the same time, the ground potential plate tied inside the oil tank is also very easy to bulge towards the transformer body due to furnace drying and vacuuming processes, reducing the electrical insulation margin and increasing the possibility of breakdown accidents. Summary of the invention

[0004] The purpose of the present invention is to provide a novel method for optimizing the internal ground potential of a transformer oil tank in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A new method for optimizing the internal ground potential of a transformer tank. The installation steps are as follows:

[0007] S1. Lay a layer of semi-conductive paper on the surface of the lower insulating paperboard;

[0008] S2, laying double-sided adhesive paper on the semi-conductive paper in S1;

[0009] S3. Evenly lay multiple groups of vertical copper tapes on the double-sided adhesive tape, and lay a horizontal copper tape to connect the multiple groups of vertical copper tapes into one, and then lead out the ground lead;

[0010] S4, cover the copper tape with another layer of semi-conductive paper;

[0011] S5, laying an upper insulating paperboard on the semi-conductive paper in S4;

[0012] S6, the lower insulating cardboard, the semi-conductive paper, the double-sided adhesive paper, the copper tape, the semi-conductive paper and the lower insulating cardboard are connected to form a ground potential plate;

[0013] S7. Use the fixing parts to fix the ground potential plate to the wire clamp frame;

[0014] S8, use the lifting device to lift the wire clamp frame in S5, and use the fixing parts to connect the wire clamp frame to the fixing seat on the inner side of the fuel tank wall;

[0015] S9. Fix a grounding lead wire to the grounding bolt on the inner side of the box wall to form a single-point grounding.

[0016] As a further optimization scheme of the present invention, the lower insulating paperboard, semi-conductive paper, double-sided adhesive tape, copper tape, semi-conductive paper and upper insulating paperboard arranged in sequence in step S6 are integrally hot-pressed.

[0017] As a further optimization solution of the present invention, the thickness of the upper insulating paperboard and the lower insulating paperboard is 1 mm.

[0018] As a further optimization solution of the present invention, the copper strip has a thickness of 0.2 mm and a width of 20 mm.

[0019] As a further optimization scheme of the present invention, the fixing member includes a glass fiber screw and an insulating nut, and the glass fiber screw and the insulating nut cooperate with each other to connect the ground potential plate and the wire clamp frame and the wire clamp frame and the fixing seat.

[0020] As a further optimization scheme of the present invention, the fixing part is used to connect the wire clamp frame and the fixing seat, the fixing part includes a pin part, a socket is provided on the surface of the fixing seat, a through hole is provided on the surface of the ground potential plate, and a mounting hole is provided on the surface of the wire clamp frame. The pin part passes through the mounting hole, the through hole and the socket in sequence, and an installation component is connected to the pin part, and the installation component includes a fixing block, the fixing block is fixedly connected to one end of the pin part located in the fixing seat, a slide groove is provided on the inner wall of the socket, an elastic part 1 is connected to the inner wall of the slide groove, and one end of the elastic part 1 is fixedly connected to an inclined block, the inclined block extends into the socket, and the side of the fixing block is an inclined surface, and the fixing block cooperates with the inclined block to connect the wire clamp frame to the fixing seat.

[0021] As a further optimization scheme of the present invention, the latch member includes a pressing portion, an insertion portion and an installation portion, the pressing portion and the installation portion are respectively connected to two ends of the insertion portion, the pressing portion is located in the installation hole, the installation portion is located in the insertion hole, and the fixing block is connected to one end of the installation portion away from the insertion portion.

[0022] As a further optimization scheme of the present invention, the installation component also includes a movable block, which is slidably connected to the surface of the installation part, and a pop-up component is connected to the installation hole. The movable block cooperates with the inclined block and the pop-up component to allow the latch to be removed from the installation hole.

[0023] As a further optimization scheme of the present invention, the pop-up assembly includes a spring plate and an elastic member 2, the spring plate is slidably connected to the inner wall of the mounting hole, the two ends of the elastic member 2 are respectively connected to the inner wall of the mounting hole and the surface of the spring plate, the spring plate is sleeved on the outside of the insertion part and abuts against the surface of the pressing part.

[0024] The beneficial effects of the present invention are as follows: the ground potential plate in the present invention adopts upper and lower layers of insulating cardboard with glue paper laid on the inner sides, and evenly arranged copper strips and semi-conductive paper are placed in the middle. After the overall hot pressing and forming, the ground potential plate is grounded at one point. The new ground potential plate effectively avoids the displacement, wrinkling and local protrusion of the material after the overall drying due to the different shrinkage rates of each material, which causes the ground electrode to deform and affect the internal electric field, thereby improving the quality of the ground potential plate inside the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the ground potential plate according to the first embodiment of the present invention;

[0026] Figure 2 It is a side view of the overall structure of the ground potential plate of the first embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the connection between the fixing base, the ground potential plate and the wire clamp frame of the first embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a wire clamp frame according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of a fixing member according to the first embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of the structure of a fixing member according to the second embodiment of the present invention;

[0031] Figure 7 The present invention Figure 6 A partial enlarged view of the fixing structure;

[0032] Figure 8 It is a schematic diagram of the structure of the fixing block of the second embodiment of the present invention.

[0033] In the figure: 1. lower insulating cardboard; 2. semi-conductive paper; 3. double-sided adhesive tape; 4. copper tape; 5. upper insulating cardboard; 6. ground potential plate; 7. glass fiber screw; 8. insulating nut; 9. wire clamp frame; 10. fixing seat; 11. latch member; 111. pressing part; 112. insertion part; 113. installation part; 12. installation assembly; 121. fixing block; 122. movable block; 13. elastic member 1; 14. inclined block; 15. connecting rod; 16. limiting block; 17. ejection assembly; 171. spring plate; 172. elastic member 2. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] Embodiment 1

[0036] refer to Figure 1 and Figure 2 , a new method for optimizing the internal ground potential of the transformer tank, the installation steps are as follows:

[0037] S1. Lay a layer of semi-conductive paper on the surface of the lower insulating paperboard;

[0038] S2, laying double-sided adhesive paper on the semi-conductive paper in S1;

[0039] S3. Evenly lay multiple groups of vertical copper tapes on the double-sided adhesive tape, and lay a horizontal copper tape to connect the multiple groups of vertical copper tapes into one, and then lead out the ground lead;

[0040] S4, cover the copper tape with another layer of semi-conductive paper;

[0041] S5, laying an upper insulating paperboard on the semi-conductive paper in S4;

[0042] S6, the lower insulating cardboard, the semi-conductive paper, the double-sided adhesive paper, the copper tape, the semi-conductive paper and the lower insulating cardboard are connected to form a ground potential plate;

[0043] S7. Use the fixing parts to fix the ground potential plate to the wire clamp frame;

[0044] S8, use the lifting device to lift the wire clamp frame in S5, and use the fixing parts to connect the wire clamp frame to the fixing seat on the inner side of the fuel tank wall;

[0045] S9. Fix a grounding lead wire to the grounding bolt on the inner side of the tank wall (tank wall) to form a grounding point.

[0046] It should be noted that the upper insulating paperboard 5 and the lower insulating paperboard 1 are both made of T4 insulating paperboard, and the shape and size of the semi-conductive paper 2 are determined according to the required range of the ground electrode. The semi-conductive paper 2 must not be wrinkled, creased or damaged.

[0047] Furthermore, in step S6, the lower insulating paperboard 1, the semi-conductive paper 2, the double-sided adhesive paper 3, the copper tape 4, the semi-conductive paper 2 and the upper insulating paperboard 5 are integrally hot-pressed to form a ground potential plate 6.

[0048] It should be noted that the hot-pressed ground potential plate 6 effectively avoids the displacement, wrinkling and local protrusion of the material after overall drying due to the different shrinkage rates of the materials. The semi-conductive paper 2 forms a flat ground potential after contact with the copper tape 4. The upper insulating cardboard 5 and the lower insulating cardboard 1 covered by the semi-conductive paper 2 avoid the local field strength concentration inside the fuel tank, thereby improving the quality of the ground potential plate 6 inside the fuel tank.

[0049] Furthermore, the thickness of the upper insulating paperboard 5 and the lower insulating paperboard 1 is 1 mm.

[0050] Furthermore, the copper strip 4 has a thickness of 0.2 mm and a width of 20 mm.

[0051] According to the above-described novel method for optimizing the internal ground potential of a transformer oil tank, a fixing structure is provided for connecting a ground potential plate 6 with a wire clamp frame 9 and a wire clamp frame 9 with a fixing seat 10. Specifically, the fixing includes a glass fiber screw 7 and an insulating nut 8, which cooperate with each other.

[0052] In the ground potential optimization method provided by the present invention, after the edge of the hot-pressed ground potential plate 6 is punched with a frame-type assembly structure, glass fiber screws 7 and insulating nuts 8 are used to fix the wire clamp frame 9 composed of a wire clamp and a frame plate, and then the wire clamp frame 9 is lifted as a whole by a lifting device in conjunction with the lifting holes opened on the frame plate, and then fixed to a fixing seat 10 on the inner wall of the transformer oil tank by glass fiber screws 7 and insulating nuts 8, and then the grounding lead on the ground potential plate 6 is connected to the grounding bolt to complete the one-point grounding. This assembly method can be assembled as a whole without laying down or turning over the oil tank, which shortens the assembly time, reduces the occurrence of moisture absorption caused by the insulation parts of the body being exposed to air, and further improves the quality of the transformer.

[0053] Embodiment 2

[0054] refer to Figure 6 and Figure 7The present embodiment is further improved on the basis of the first embodiment, and provides another structure of a fixing member, which is used to connect the wire clamp frame 9 and the fixing seat 10. Compared with the structure of the fixing member in the first embodiment, the fixing member provided in the present embodiment can achieve the effect of quick installation and removal. Specifically, the fixing member includes a plug member 11, a plug hole is provided on the surface of the fixing seat 10, a through hole is provided on the surface of the ground potential plate 6, and a mounting hole is provided on the surface of the wire clamp frame 9. The plug member 11 passes through the mounting hole, the through hole and the plug hole in sequence. The plug member 11 is connected to a mounting assembly 12, and the mounting assembly 12 includes a fixing block 121. The fixing block 121 is fixedly connected to one end of the plug member 11 located in the fixing seat 10, a slide groove is provided on the inner wall of the plug hole, and an elastic member 13 is connected to the inner wall of the slide groove. One end of the elastic member 13 is fixedly connected to an inclined block 14, and the inclined block 14 extends into the plug hole. The side of the fixing block 121 is an inclined surface. The fixing block 121 cooperates with the inclined block 14 to connect the wire clamp frame 9 to the fixing seat 10.

[0055] It should be noted that the elastic member 13 is a compression spring, and one end of the inclined block 14 close to the elastic member 13 is fixedly connected to a connecting rod 15, and the other end of the connecting rod 15 is connected to a limiting block 16, which is slidably connected in the slide groove, and the compression spring is sleeved on the surface of the connecting rod 15.

[0056] It should be further explained that the moving distance of the inclined block 14 is limited by the cooperation between the limiting block 16 and the sliding groove.

[0057] Furthermore, the latch member 11 includes a pressing portion 111, an insertion portion 112 and a mounting portion 113, the pressing portion 111 and the mounting portion 113 are respectively connected to two ends of the insertion portion 112, the pressing portion 111 is located in the mounting hole, the mounting portion 113 is located in the insertion hole, and the fixing block 121 is connected to one end of the mounting portion 113 away from the insertion portion 112.

[0058] Furthermore, the mounting assembly 12 also includes a movable block 122, which is slidably connected to the surface of the mounting portion 113, and a pop-up assembly 17 is connected to the mounting hole. The movable block cooperates with the inclined block 14 and the pop-up assembly 17 to remove the latch member 11 from the mounting hole.

[0059] It should be noted that the cross section of the side of the movable block 122 is in a “<” shape.

[0060] It should be further explained that the surface of the fixed block 121 on one side close to the movable block 122 is recessed in the direction away from the movable block 122, and the shape of the recess is consistent with the shape of the lower half of the movable block 122 (i.e., the position from the widest position of the movable block 122 to the position of the surface of the movable block 122 on one side close to the fixed block 121). For details, please refer to Figure 8 .

[0061] Furthermore, the pop-up assembly 17 includes a spring plate 171 and an elastic member 172. The spring plate 171 is slidably connected to the inner wall of the mounting hole. The two ends of the elastic member 172 are respectively connected to the inner wall of the mounting hole and the surface of the spring plate 171. The spring plate 171 is sleeved on the outer side of the insertion portion 112 and abuts against the surface of the pressing portion 111.

[0062] It should be noted that the second elastic member 172 is a tension spring, and the tension spring is sleeved on the surface of the insertion portion 112 .

[0063] When the locking nut 11 is in the state of being moved, the locking nut 121 is engaged with the locking nut 141 and the locking nut 142 is engaged with the locking nut 141. When the locking nut 11 is in the state of being moved, the locking nut 121 is engaged with the locking nut 141 and the locking nut 142 is engaged with the locking nut 141.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A novel method for optimizing the internal ground potential of a transformer oil tank, characterized in that: The installation steps are as follows: S1. Lay a layer of semi-conductive paper on the surface of the lower insulating paperboard; S2, laying double-sided adhesive paper on the semi-conductive paper in S1; S3. Evenly lay multiple groups of vertical copper tapes on the double-sided adhesive tape, and lay a horizontal copper tape to connect the multiple groups of vertical copper tapes into one, and then lead out the ground lead; S4, cover the copper tape with another layer of semi-conductive paper; S5, laying an upper insulating paperboard on the semi-conductive paper in S4; S6, the lower insulating cardboard, the semi-conductive paper, the double-sided adhesive paper, the copper tape, the semi-conductive paper and the lower insulating cardboard are connected to form a ground potential plate; S7. Use a fixing to fix the ground potential plate to the wire clamp frame; S8, use the lifting device to lift the wire clamp frame in S5, and use the fixing parts to connect the wire clamp frame to the fixing seat on the inner side of the fuel tank wall; S9. Fix the grounding lead to the grounding bolt on the inner side of the box wall to form a single-point grounding.

2. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 1, characterized in that: In step S6, the lower insulating paperboard (1), the semi-conductive paper (2), the double-sided adhesive paper (3), the copper tape (4), the semi-conductive paper (2) and the upper insulating paperboard (5) which are sequentially arranged are integrally hot-pressed.

3. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 1, characterized in that: The thickness of the upper insulating paperboard (5) and the lower insulating paperboard (1) is 1 mm.

4. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 1, characterized in that: The copper strip (4) has a thickness of 0.2 mm and a width of 20 mm.

5. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 1, characterized in that: The fixing member comprises a glass fiber screw (7) and an insulating nut (8), and the glass fiber screw (7) and the insulating nut (8) cooperate with each other and are used to connect the ground potential plate (6) and the wire clamp frame (9) and the wire clamp frame (9) and the fixing seat (10).

6. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 1, characterized in that: The fixing member is used to connect the wire clamp frame (9) and the fixing seat (10), and the fixing member includes a plug member (11). The surface of the fixing seat (10) is provided with a plug hole, the surface of the ground potential plate (6) is provided with a through hole, and the surface of the wire clamp frame (9) is provided with a mounting hole. The plug member (11) passes through the mounting hole, the through hole and the plug hole in sequence. The plug member (11) is connected to a mounting assembly (12), and the mounting assembly (12) includes a fixing block (121). The fixing block (121) is fixedly connected to one end of the plug member (11) located in the fixing seat (10); a slide groove is provided on the inner wall of the insertion hole; an elastic member (13) is connected to the inner wall of the slide groove; an inclined block (14) is fixedly connected to one end of the elastic member (13); the inclined block (14) extends into the insertion hole; a side surface of the fixing block (121) is an inclined surface; the fixing block (121) cooperates with the inclined block (14) to connect the wire clamp frame (9) to the fixing seat (10).

7. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 4, characterized in that: The latch member (11) comprises a pressing portion (111), an inserting portion (112) and a mounting portion (113); the pressing portion (111) and the mounting portion (113) are respectively connected to two ends of the inserting portion (112); the pressing portion (111) is located in the mounting hole; the mounting portion (113) is located in the insertion hole; and the fixing block (121) is connected to one end of the mounting portion (113) away from the inserting portion (112).

8. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 6, characterized in that: The mounting assembly (12) further comprises a movable block (122) which is slidably connected to the surface of the mounting portion (113); a pop-up assembly (17) is connected to the mounting hole; the movable block cooperates with the inclined block (14) and the pop-up assembly (17) to enable the latch member (11) to be removed from the mounting hole.

9. A novel method for optimizing the internal ground potential of a transformer oil tank according to claim 7, characterized in that: The pop-up assembly (17) comprises a spring plate (171) and a second elastic member (172); the spring plate (171) is slidably connected to the inner wall of the mounting hole; two ends of the second elastic member (172) are respectively connected to the inner wall of the mounting hole and the surface of the spring plate (171); the spring plate (171) is sleeved on the outer side of the insertion portion (112) and abuts against the surface of the pressing portion (111).

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