A novel transformer oil tank internal ground potential optimization method

Abstract

The present application relates to a kind of novel transformer oil tank internal ground potential optimization method.The optimization method includes the following installation steps:S1, a layer of semiconductive paper is laid on the surface of lower insulating paperboard;S2, double-sided gummed paper is laid in the semiconductive paper in S1;S3, multiple groups of vertical copper strips are evenly laid on the double-sided gummed paper, and a horizontal copper strip is laid to connect the multiple groups of vertical copper strips into a whole and then lead out a grounding lead;In the ground potential plate of the optimization method, double-layer insulating paperboard is used to lay gummed paper on the inner side, and copper strips and semiconductive paper arranged uniformly are placed in the middle, after whole hot-pressing molding, the ground potential plate is grounded at one point, the new ground potential plate effectively avoids the displacement, wrinkling and local bulging of materials due to different shrinkage rates of various materials after overall drying, which causes the deformation of ground electrode to affect the internal electric field, and improves the quality of the ground potential plate inside the oil tank.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformers, and particularly relates to a novel transformer oil tank internal ground potential optimization method. BACKGROUND

[0002] A transformer is an important component of a power system, and safe and stable operation of the transformer directly affects power grid safety and even economic development. With the development of the power system, the capacity and voltage grade of the transformer are continuously improved, but the external size of the transformer cannot be expanded unlimitedly due to transportation limitations. How to ensure electrical safety between the transformer body, the lead wire and the oil tank ground potential of the large-capacity and high-voltage grade transformer has become one of the difficulties in transformer design.

[0003] In conventional transformer design, a flat conductive material is mostly laid on an insulating paper board, and is bound to the inside of the oil tank and grounded to the oil tank at one point to form a flat ground potential plate, so as to reduce the field strength of the ground potential. However, due to the different shrinkage rates of the conductive material and the insulating paper board, displacement, wrinkling and local bulging of the conductive material are prone to occur after overall drying. If the position corresponds to a high-voltage area of the transformer, a breakdown accident is prone to occur. At the same time, the ground potential plate bound to the inside of the oil tank is also prone to bulge towards the transformer body due to drying in the furnace and vacuumizing process, thereby reducing the electrical insulation margin and increasing the possibility of a breakdown accident. SUMMARY

[0004] The purpose of the present application is to provide a novel transformer oil tank internal ground potential optimization method to solve the above problems.

[0005] The application achieves the above purpose by the following technical solutions:

[0006] A novel transformer oil tank internal ground potential optimization method, the installation steps are as follows:

[0007] S1, laying a layer of semi-conductive paper on the surface of the lower insulating paper board;

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

[0009] S3, uniformly laying multiple groups of vertical copper strips on the double-sided gummed paper, and laying a horizontal copper strip to connect the multiple groups of vertical copper strips into one body and then leading out a grounding lead wire;

[0010] S4, covering the copper strip with a layer of semi-conductive paper;

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

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

[0013] S7, the ground potential plate is fixed on the wire clamp frame using a fixing member;

[0014] S8, the wire clamp frame in S5 is lifted using a lifting device, and the wire clamp frame is connected to the fixing seat on the inner side of the oil tank wall using a fixing member;

[0015] S9, a point grounding lead is fixed on the grounding bolt on the inner side of the tank wall to form a point grounding.

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

[0017] As a further optimization scheme of the application, the thickness of the upper layer insulation paperboard and the lower layer insulation paperboard is 1mm.

[0018] As a further optimization scheme of the application, the thickness of the copper tape is 0.2mm, and the width is 20mm.

[0019] As a further optimization scheme of the application, the fixing member includes a fiberglass screw and an insulating nut, which 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 application, the fixing member is used to connect the wire clamp frame and the fixing seat, the fixing member includes a plug member, the surface of the fixing seat is provided with a plug hole, the surface of the ground potential plate is provided with a through hole, and the surface of the wire clamp frame is provided with a mounting hole, the plug member passes through the mounting hole, the through hole and the plug hole in sequence, the plug member is connected with a mounting assembly, the mounting assembly includes a fixed block, the fixed block is fixedly connected to one end of the plug member located in the fixing seat, the inner wall of the plug hole is provided with a sliding groove, the sliding groove is connected with an elastic member one, one end of the elastic member one is fixedly connected with an inclined block, the inclined block extends into the plug hole, the side surface of the fixed block is an inclined surface, and the fixed block cooperates with the inclined block to connect the wire clamp frame to the fixing seat.

[0021] As a further optimization scheme of the application, the plug member includes a pressing part, a penetrating part and a mounting part, the pressing part and the mounting part are connected to the two ends of the penetrating part respectively, the pressing part is located in the mounting hole, the mounting part is located in the plug hole, and the fixed block is connected to one end of the mounting part away from the penetrating part.

[0022] As a further optimization scheme of the present application, the mounting assembly further comprises a movable block, the movable block is slidingly connected to the surface of the mounting portion, the mounting hole is connected with a pop-up assembly, the movable block cooperates with the inclined block and the pop-up assembly to enable the plug pin to be taken out from the mounting hole.

[0023] As a further optimization scheme of the present application, the pop-up assembly comprises two elastic members and a pop-up plate, the pop-up plate is slidingly connected to the inner wall of the mounting hole, the two ends of the elastic member are respectively connected to the inner wall of the mounting hole and the surface of the pop-up plate, the pop-up plate is sleeved outside the penetrating portion and abuts against the surface of the pressing portion.

[0024] The present application has the beneficial effect that the ground potential plate in the present application adopts the upper and lower two layers of insulating paper boards, the inner sides of which are paved with gummed paper, and the copper belts and semi-conductive paper are evenly arranged in the middle, and after the whole hot-pressing forming, the ground potential plate is grounded, the new ground potential plate effectively avoids the displacement, wrinkling and local bulging of the materials after the whole drying due to the different shrinkage rates of the materials, which causes the deformation of the ground electrode and affects the internal electric field, and improves the quality of the ground potential plate in the oil tank. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure schematic view of the ground potential plate of the embodiment one of the present application;

[0026] Figure 2 is the side view of the overall structure of the ground potential plate of the embodiment one of the present application;

[0027] Figure 3 is the connection schematic view of the fixing seat, the ground potential plate and the wire clamp frame of the embodiment one of the present application;

[0028] Figure 4 is the wire clamp frame schematic view of the embodiment one of the present application;

[0029] Figure 5 is the fixing member structure schematic view of the embodiment one of the present application;

[0030] Figure 6 is the fixing member structure schematic view of the embodiment two of the present application;

[0031] Figure 7 is the fixing member structure partial enlarged view of the embodiment two of the present application; Figure 6

[0032] Figure 8 is the fixing block structure schematic view of the embodiment two of the present application.

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

[0034] The following further describes the present application in conjunction with the drawings. It is necessary to point out here that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0035] Example one

[0036] Reference Figure 1 and Figure 2 A new transformer oil tank internal ground potential optimization method, the installation steps are as follows:

[0037] S1, a layer of semi-conductive paper is laid on the surface of the lower insulating paperboard;

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

[0039] S3, a plurality of vertical copper strips are evenly laid on the double-sided adhesive paper, and a horizontal copper strip is laid to connect the plurality of vertical copper strips into one body and then lead out a grounding lead;

[0040] S4, a layer of semi-conductive paper is further covered on the copper strip;

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

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

[0043] S7, the ground potential plate is fixed on the wire clamp frame using a fixing part;

[0044] S8, the wire clamp frame in S5 is lifted using a hoisting device, and the wire clamp frame is connected to the fixing seat on the inner side of the tank wall using a fixing part;

[0045] S9, a point grounding is formed by fixing a point grounding lead on the grounding bolt on the inner side of the tank wall (tank wall of the oil tank).

[0046] It should be noted that the upper insulating paperboard 5 and the lower insulating paperboard 1 are both T4 insulating paperboards, and the shape and size of the semi-conductive paper 2 depend on the range of the ground electrode, and the semi-conductive paper 2 cannot have wrinkles, folds, and damages.

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

[0048] It should be noted that the hot-pressed ground potential plate 6 effectively avoids the displacement, wrinkles, and local bulging of the materials due to the different shrinkage rates of the materials after overall drying, and the semi-conductive paper 2 and the copper strip 4 form a flat ground potential after being in contact, and the upper insulating paperboard 5 and the lower insulating paperboard 1 covered thereby avoid the occurrence of local field intensity concentration in the oil tank, thereby improving the quality of the ground potential plate 6 in the oil tank.

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

[0050] Further, the thickness of the copper strip 4 is 0.2 mm, and the width is 20 mm.

[0051] According to the above-described novel transformer oil tank internal ground potential optimization method, a fixing member structure is provided for connecting the ground potential plate 6 with the wire clamp frame 9 and the wire clamp frame 9 with the fixing seat 10, specifically, the fixing member includes a fiberglass screw 7 and an insulating nut 8, and the fiberglass screw 7 and the insulating nut 8 are used in cooperation.

[0052] In the ground potential optimization method provided in the present application, the hot-pressed ground potential plate 6 is punched at the edges, and then the wire clamp frame 9 composed of a wire clamp and a frame plate is fixed on the fiberglass screw 7 and the insulating nut 8, and then the wire clamp frame 9 is integrally hoisted through the hoisting hole provided on the frame plate by using a hoisting device, and then the wire clamp frame 9 is fixed on the fixing seat 10 on the inner wall of the transformer oil tank by using the fiberglass screw 7 and the insulating nut 8, and then the grounding lead on the ground potential plate 6 is connected to the grounding bolt to complete the point grounding, and this assembly method can be integrally assembled without putting down and turning over the oil tank, thereby shortening the assembly time, reducing the occurrence of moisture absorption of the body insulating member due to exposure, and further improving the quality of the transformer.

[0053] Example Two

[0054] Reference Figure 6 and Figure 7The embodiment is further improved on the basis of embodiment one, and provides another structure of the fixing part for connecting the wire clamp frame 9 and the fixing base 10. Compared with the structure of the fixing part in embodiment one, the fixing part provided in the embodiment can achieve the effect of quick installation and disassembly. Specifically, the fixing part comprises a bolt 11, the surface of the fixing base 10 is provided with a insertion hole, the surface of the grounding 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 bolt 11 passes through the mounting hole, the through hole and the insertion hole in sequence. The bolt 11 is connected with a mounting assembly 12. The mounting assembly 12 comprises a fixed block 121. The fixed block 121 is fixedly connected to one end of the bolt 11 located in the fixing base 10. The inner wall of the insertion hole is provided with a sliding slot. The inner wall of the sliding slot is connected with a first elastic piece 13. One end of the first elastic piece 13 is fixedly connected with an inclined block 14. The inclined block 14 extends into the insertion hole. The side surface of the fixed block 121 is an inclined surface. The fixed block 121 cooperates with the inclined block 14 to connect the wire clamp frame 9 to the fixing base 10.

[0055] It should be noted that the first elastic piece 13 is a compression spring. One end of the inclined block 14 close to the first elastic piece 13 is fixedly connected with a connecting rod 15. The other end of the connecting rod 15 is connected with a limiting block 16. The limiting block 16 is slidingly connected in the sliding slot. The compression spring is sleeved on the surface of the connecting rod 15.

[0056] It should be further noted that the distance of the movement of the inclined block 14 is limited by the cooperation of the limiting block 16 and the sliding slot.

[0057] Further, the bolt 11 comprises a pressing portion 111, a penetrating portion 112 and a mounting portion 113. The pressing portion 111 and the mounting portion 113 are connected to two ends of the penetrating portion 112 respectively. The pressing portion 111 is located in the mounting hole. The mounting portion 113 is located in the insertion hole. The fixed block 121 is connected to one end of the mounting portion 113 away from the penetrating portion 112.

[0058] Further, the mounting assembly 12 further comprises a movable block 122. The movable block 122 is slidingly connected to the surface of the mounting portion 113. The mounting hole is connected with a pop-up assembly 17. The movable block cooperates with the inclined block 14 and the pop-up assembly 17 to make the bolt 11 taken out from the mounting hole.

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

[0060] It should be further noted that the side surface of the fixed block 121 close to the movable block 122 is recessed in the direction away from the movable block 122. The recessed shape is consistent with the shape of the lower half of the movable block 122 (i.e. the widest position of the movable block 122 to the position of the side surface of the movable block 122 close to the fixed block 121). Specifically, it can be referred to Figure 8 .

[0061] Further, the ejecting assembly 17 comprises a spring plate 171 and a second elastic member 172, the spring plate 171 is slidingly connected to the inner wall of the mounting hole, the 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 penetrating part 112 and abuts against the surface of the pressing part 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 penetrating part 112.

[0063] In actual use, the plug pin 11 is inserted into the insertion hole, the fixed block 12 extrudes the inclined block 14 into the sliding groove, when the fixed block 12 moves to the plane side of the inclined block 14, the inclined block 14 clamps the fixed block 121, at this time, the plug pin 11 can connect the wire clamp frame 9 to the fixed seat 10, when it is needed to remove the plug pin 11, only the pressing part 111 of the plug pin 11 needs to be pressed, specifically, after the pressing part 111 of the plug pin 11 is pressed, the movable block 122 will push the inclined block 14 into the sliding groove, when the inclined block passes the most convex point of the movable block 122, the inclined block 14 is ejected again, at this time, under the action of the second elastic member 172, the spring plate 171 will eject the plug pin 11, in the process of ejecting the plug pin 11, the inclined block 14 will drive the movable block 122 to move, finally, the two cooperate, the inclined block 14 will directly pass the fixed block 121, so that the plug pin 11 is ejected.

[0064] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A method for optimizing the internal ground potential of a transformer 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 cardboard; S2. Lay double-sided adhesive paper on the semi-conductive paper in S1; S3. Evenly lay multiple sets of vertical copper strips on double-sided adhesive tape, and lay a horizontal copper strip to connect the multiple sets of vertical copper strips into one piece before leading out the grounding lead. S4. Cover the copper strip with another layer of semi-conductive paper; S5. Lay an upper layer of insulating paperboard on the semi-conductive paper in S4. S6. The lower insulating paperboard, semi-conductive paper, double-sided adhesive paper, copper strip, semi-conductive paper and lower insulating paperboard are connected to form a ground potential plate; S7. Use fasteners to fix the ground potential plate to the wire clamp frame; S8. Use a lifting device to lift the wire clamp frame in S5, and use fasteners to connect the wire clamp frame to the fixed seat on the inside of the tank wall. S9. Fix the grounding lead to the grounding bolt on the inside of the box wall to form a single-point grounding; In step S6, the lower insulating paperboard (1), semi-conductive paper (2), double-sided adhesive paper (3), copper strip (4), semi-conductive paper (2) and upper insulating paperboard (5) are sequentially hot-pressed together; The fastener is used to connect the wire clamp frame (9) and the fixing seat (10). The fastener includes a pin (11). The surface of the fixing seat (10) is provided with a socket. The surface of the ground potential plate (6) is provided with a through hole. The surface of the wire clamp frame (9) is provided with a mounting hole. The pin (11) passes through the mounting hole, the through hole and the socket in sequence. The pin (11) is connected to an installation component (12). The installation component (12) includes a fixing block (121). The fixing block (121) is fixedly connected to one end of the pin (11) located in the fixing seat (10). The inner wall of the insertion hole is provided with a sliding groove. An elastic element (13) is connected to the inner wall of the sliding groove. One end of the elastic element (13) is fixedly connected to an inclined block (14). The inclined block (14) extends into the insertion 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).

2. The method for optimizing the internal ground potential of a transformer 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.

3. The method for optimizing the internal ground potential of a transformer 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.

4. The method for optimizing the internal ground potential of a transformer tank according to claim 1, characterized in that: The fastener includes a fiberglass screw (7) and an insulating nut (8), which cooperate to connect the ground potential plate (6) to the wire clamp frame (9) and the wire clamp frame (9) to the fixing base (10).

5. The method for optimizing the internal ground potential of a transformer tank according to claim 3, characterized in that: The pin (11) includes a pressing part (111), an inserting part (112) and a mounting part (113). The pressing part (111) and the mounting part (113) are respectively connected to the two ends of the inserting part (112). The pressing part (111) is located in the mounting hole, and the mounting part (113) is located in the insertion hole. The fixing block (121) is connected to the end of the mounting part (113) away from the inserting part (112).

6. The method for optimizing the internal ground potential of a transformer tank according to claim 4, characterized in that: The mounting assembly (12) also includes a movable block (122), which is slidably connected to the surface of the mounting part (113). A pop-out assembly (17) is connected inside the mounting hole. The movable block, together with the inclined block (14) and the pop-out assembly (17), can remove the pin (11) from the mounting hole.

7. The method for optimizing the internal ground potential of a transformer tank according to claim 6, characterized in that: The pop-out assembly (17) includes a spring plate (171) and an elastic element two (172). The spring plate (171) is slidably connected to the inner wall of the mounting hole. The two ends of the elastic element two (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 outside of the insertion part (112) and abuts against the surface of the pressing part (111).

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