Main transformer framework suitable for high-altitude and high-intensity areas

Abstract

The utility model belongs to the technical field of transformer substations, and particularly relates to a main transformer framework suitable for high-altitude and high-intensity areas, which comprises a firewall, framework beams and framework columns. The framework column comprises a first column foot and a second column foot; the end, close to the main transformer, of the framework beam is provided with an insulator string arranged in the horizontal direction. The end, away from the framework beam, of the insulator string is provided with a horizontal wire and a lower lead. The projections of the framework girders and the firewall on the horizontal plane are perpendicular to each other and are arranged at intervals; the first column foot is fixedly installed at the end, away from the main transformer sleeve, of the upper surface of the firewall, and the second column foot is fixedly installed on a site table top. The firewall is of a frame type structure; the wiring end, away from the framework girder, of the insulator string is vertically aligned with the main transformer sleeve. The lower lead is perpendicular to the horizontal plane, and the lower end of the lower lead is connected to a main transformer terminal of the main transformer sleeve. The lower lead is arranged perpendicular to the horizontal plane by increasing the horizontal distance between the framework beam and the main transformer sleeve, the horizontal tension borne by the main transformer sleeve is reduced, and the shock resistance of the main transformer sleeve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer substations, and in particular relates to a main transformer frame suitable for high-altitude and high-intensity areas. Background Art

[0002] The main transformer frame is the supporting structure for the conductor to access the main transformer. It is usually set above the main transformer. Its structural form is usually a bent structure, including frame beams and frame columns of a herringbone structure. The frame columns are erected on the ground or on the firewall to support the frame beams. The frame beams are generally lattice steel beams with triangular variable sections, steel chords, angle steel webs, and connected by bolts. The beams and columns are fixed and connected by bolts. The splicing joints of the columns and beam chords are connected by rigid or flexible flanges, and are hot-dip galvanized for corrosion protection.

[0003] As attached Figure 1-2 As mentioned above, in order to meet the safety and fire protection requirements, the substation is also provided with a fire wall 9 at the main transformer frame. In order to save floor space, the main transformer frame is arranged across the substation fire wall 9, that is, the frame beam 1 is erected directly above the fire wall 9, and the projections of the frame beam 1 and the fire wall 9 on the horizontal plane are perpendicular and intersecting, and the column feet of the frame columns 2 are connected to the fire wall 9 by anchor bolts. The frame beam 1 is provided with an insulator string 3 arranged in the horizontal direction, and the end of the insulator string 3 away from the frame beam is provided with a horizontal conductor 4 and a lower lead 5 of a cross-line T connection, and the lower lead 5 is downwardly connected to the main transformer bushing 61 of the main transformer 6.

[0004] The number of insulators in the insulator string 3 needs to be modified according to the altitude. The air in high altitude areas is thin and the air pressure is low, so the breakdown voltage is lower than that in plains. Increasing the number of insulators can increase the distance between the frame beam 1 and the line, thereby increasing the breakdown voltage and protecting the line safety. Therefore, the insulator string 3 in high altitude areas is longer than the insulator string 3 in low altitude areas. High altitude generally refers to an altitude of more than 2000m. When the main transformer frame of the above structure is used in high altitude areas, such as the attached Figure 3As shown, due to the increase in the length of the insulator string 3, the lower lead 5 connected from the end of the insulator string 3 away from the frame beam 1 to the main transformer bushing 61 will be in a serious oblique tension state, and the lower lead 5 will pull the main transformer bushing 61 upward, so that the main transformer bushing 61 is simultaneously subjected to the upward pulling force and the horizontal pulling force. When an earthquake occurs, the firewall 9 and the main transformer 6 in the substation will shake to varying degrees, causing the main transformer bushing 61, which is already subjected to the oblique pulling force of the lower lead 5, to be subjected to a greater pulling force in the horizontal direction. Especially when the earthquake intensity level is above 7 degrees, the lower lead 5 is very likely to damage the main transformer terminal on the main transformer bushing 61, causing a circuit failure. In most cases, the diameter and mass of the lower lead 5 are both large, and even if the length of the lower lead 5 is increased, it is difficult to reduce the horizontal pulling of the lower lead 5 on the main transformer bushing 61. For example, when the transmission voltage is 1000KV, the lower lead 5 needs to use a six-split conductor, and the diameter of the single conductor inside is more than 70mm. The diameter of the lower lead 5 can reach 1m, and the weight and volume are both large. Considering the need for earthquake resistance, it is now necessary to redesign the above-mentioned main transformer frame structure located in high-altitude areas. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a main transformer frame suitable for high-altitude and high-intensity areas, improve the earthquake resistance of the main transformer bushing, and ensure the stable operation of the transformer substation.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a main transformer frame suitable for high-altitude and high-intensity areas, including a firewall, a frame beam of a truss structure and a frame column for supporting the frame beam; the frame column includes a first column foot and a second column foot; an insulator string arranged in a horizontal direction is provided at one end of the frame beam close to the main transformer, and a horizontal conductor and a down lead are arranged at one end of the insulator string away from the frame beam;

[0007] The frame beams are perpendicular to the projection of the firewall on the horizontal plane and are arranged at intervals;

[0008] The first column foot is fixedly mounted on the upper surface of the firewall at one end away from the main transformer casing, and the second column foot is fixedly mounted on the site table; the firewall is a frame structure;

[0009] The connection end of the insulator string away from the frame beam is aligned with the main transformer bushing up and down, the lower end of the lower lead is connected to the main transformer terminal of the main transformer bushing, and the lower lead is perpendicular to the horizontal plane.

[0010] Furthermore, the top surfaces of the first column foot and the second column foot are flush and a top plate is provided on the top surfaces of the two, and the frame beam is connected to the top plate.

[0011] Furthermore, a tie rod is provided between the first column foot and the second column foot, and the first column foot and the second column foot are connected by the tie rod; the upper end spacing of the first column foot and the second column foot is smaller than the lower end spacing of the first column foot and the second column foot.

[0012] Furthermore, the fire wall includes a wall and a frame structure, and the frame structure includes a plurality of frame columns; the bottom end of the first column foot is fixedly mounted on the frame column at the end of the fire wall.

[0013] Furthermore, cup-shaped foundations are provided on the site table and above the frame columns at the ends of the fire wall;

[0014] The lower end of the first column foot is cast and fixed in the cup-shaped foundation groove on the frame column, and the lower end of the second column foot is cast and fixed in the cup-shaped foundation groove on the site table.

[0015] Compared with the prior art, the utility model has the following beneficial effects: providing a main transformer frame suitable for high-altitude and high-intensity areas, which increases the horizontal spacing between the frame beam and the main transformer bushing by arranging the frame beam and the fire wall at intervals in the horizontal direction, so that the end of the insulator string away from the frame beam is just located directly above the main transformer bushing, thereby making the lower lead arranged perpendicular to the horizontal plane, reducing the horizontal pulling force of the lower lead on the main transformer bushing. When an earthquake occurs, the lower lead arranged perpendicular to the horizontal plane applies less horizontal pulling force to the main transformer bushing during the shaking process, reducing the possibility of damage to the main transformer bushing. The utility model can improve the seismic resistance of the main transformer casing and is suitable for high-altitude areas prone to earthquakes; by setting the firewall as a frame structure, the seismic resistance of the firewall and the main transformer frame is improved; by setting the first column foot and the second column foot as an eight-shaped structure and connecting the two through a tie rod, the structural stability of the frame column is improved; by fixing the first column foot on the frame column at the end of the firewall, the damage to the first column foot and the frame beam caused by the earthquake is reduced; by grouting the column foot into the groove of the cup-shaped foundation, the column foot is connected to the ground foundation and the firewall, and the connection strength of the column foot is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a top view structure in the background technology;

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0018] Figure 3 It is a cross-sectional structural schematic diagram of the main transformer frame in the background technology after being used in high altitude areas;

[0019] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0020] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure along the BB direction;

[0021] Figure 6 yes Figure 5 The enlarged structural diagram of the middle C part;

[0022] Figure numerals: 1-frame beam; 2-frame column; 21-first column foot; 22-second column foot; 23-top plate; 24-pull rod; 3-insulator string; 4-horizontal conductor; 5-lower lead; 6-main transformer; 61-main transformer bushing; 8-cup-shaped foundation; 9-firewall; 91-frame column. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] As attached Figure 4-6 As shown, a main transformer frame suitable for high-altitude and high-intensity areas includes a fire wall 9, a frame beam 1 of a truss structure and a frame column 2 for supporting the frame beam 1; the frame column 2 includes a first column foot 21 and a second column foot 22; an insulator string 3 arranged in a horizontal direction is provided at one end of the frame beam 1 close to the main transformer 6, and a horizontal conductor 4 and a lower lead 5 are arranged at one end of the insulator string 3 away from the frame beam 1; the frame beam 1 is perpendicular to the projection of the fire wall 9 on the horizontal plane and is arranged at intervals; the first column foot 21 is fixedly mounted on the upper surface of the fire wall 9 at one end away from the main transformer bushing 61, and the second column foot 22 is fixedly mounted on the site table; the fire wall 9 is a frame structure; the connection end of the insulator string 3 away from the frame beam 1 is aligned with the main transformer bushing 61 up and down, and the lower end of the lower lead 5 is connected to the main transformer terminal of the main transformer bushing 61; the lower lead 5 is perpendicular to the horizontal plane. The “vertical alignment” mentioned above means that the connection end of the frame beam 1 coincides with the projection of the main transformer bushing 61 on the horizontal plane.

[0025] The horizontal conductor 4 is connected to the lower lead 5, and the lower lead 5 is used to connect the horizontal conductor 4 to the main transformer 6. The lower lead 5 can be used to input the current of the horizontal conductor 4 to the main transformer 6 for voltage transformation, and can also be used to output the current after voltage transformation of the main transformer 6 to the output horizontal conductor 4. The insulator string 3 is used to keep a safe distance between the conductor and the frame beam 1, thereby insulating the conductor from the frame beam 1 and the frame column 2. The firewall 9 is used to separate the main transformer 6 in the substation into multiple groups to prevent the spread of flames in the event of a fire and reduce the loss of the substation in the event of a fire. The utility model changes the position of the frame column 2 relative to the firewall 9 so that the frame beam 1 and the firewall 9 are arranged at intervals in the horizontal direction, increases the horizontal spacing between the frame beam 1 and the main transformer bushing 61, and makes the end of the insulator string 3 away from the frame beam 1 just above the main transformer bushing 61, thereby making the lower lead 5 arranged vertically on the horizontal plane, reducing the horizontal pulling force of the lower lead 5 on the transformer bushing 61, and improving the earthquake resistance of the transformer line and the main transformer bushing. When an earthquake occurs at the substation, the frame beam 1, the frame column 2, the main transformer 6 and the main transformer bushing 61 thereon will all swing horizontally, and the horizontal force will cause more serious damage to the building. Compared with the lower lead 5 that is originally arranged obliquely, the lower lead 5 in the utility model applies less horizontal pulling force to the main transformer bushing 61 during the shaking process, reducing the possibility of damage to the main transformer bushing 61. By setting the firewall 9 as a frame structure, the rigidity, toughness and integrity of the firewall 9 are improved, and the possibility of damage to the firewall 9 during an earthquake is reduced.

[0026] The frame beam 1 of the truss structure is used to support and fix the power line. It is light in weight, high in strength, and has good stability, ensuring the stable operation of the power system. Its cross section can be any shape, such as a quadrilateral, a hexagon, or a triangle. Specifically, the frame beam 1 is a triangular variable cross-section structure with good stability, simple structure, and easy manufacturing and construction. It can be assembled from steel materials such as angle steel, I-beam, channel steel, and steel pipe.

[0027] The frame column 2 is used to position the frame beam 1 in the horizontal direction, and can be a variable-section column or a uniform-section column, and can be assembled and welded from angle steel, steel pipe, channel steel and other steel materials. Specifically, the top surfaces of the first column foot 21 and the second column foot 22 are flush, and a top plate 23 is also provided on the top surfaces of the two, and the frame beam 1 is connected to the top plate 23.

[0028] The first column foot 21 and the second column foot 22 can be arranged in parallel or crosswise. Preferably, a tie rod 24 is provided between the first column foot 21 and the second column foot 22, and the first column foot 21 and the second column foot 22 are connected by the tie rod 24; the upper end spacing of the first column foot 21 and the second column foot 22 is smaller than the lower end spacing of the first column foot 21 and the second column foot 22, that is, the first column foot 21 and the second column foot 22 form an eight-shaped structure, which improves the structural stability of the frame column 2.

[0029] Preferably, the fire wall 9 includes a wall and a frame structure, and the frame structure includes a plurality of frame columns 91; the bottom end of the first column foot 21 is fixedly mounted on the frame column 91 at the end of the fire wall 9, and the weight of the main transformer frame is carried by the frame column 91 on the fire wall 1 and its load is transmitted to the ground foundation. The frame column 91 has good toughness, which reduces the damage of the first column foot 21 and the frame beam 1 thereon caused by earthquake. The column foot of the frame column 2 can be connected to the site table or the frame column 91 by anchor bolts, or can be fixed by concrete pouring and other methods. Preferably, a cup-shaped foundation 8 is provided on the site table and above the frame column 91 at the end of the fire wall 9; the lower end of the first column foot 21 is cast and fixed in the groove of the cup-shaped foundation 8 on the frame column 91, and the lower end of the second column foot 22 is cast and fixed in the groove of the cup-shaped foundation 8 on the site table. Improve the connection strength between the column foot and the fire wall 9 and the ground foundation. During installation, the lower end of the column foot is first inserted into the groove of the cup-shaped foundation 8, and finally the column foot is poured and connected to the cup-shaped foundation 8 by pouring concrete in the groove. Compared with bolt connection, the connection method of the column foot of the utility model is safer and more reliable, and has better earthquake resistance.

[0030] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the figures, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationships in the figures are only used for illustrative purposes and cannot be construed as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

Claims

1. A main transformer frame suitable for high-altitude and high-intensity areas, comprising a firewall (9), a frame beam (1) of a truss structure and a frame column (2) for supporting the frame beam (1); the frame column (2) comprises a first column foot (21) and a second column foot (22); an insulator string (3) arranged in a horizontal direction is provided at one end of the frame beam (1) close to the main transformer (6), and a horizontal conductor (4) and a lower lead (5) are provided at one end of the insulator string (3) away from the frame beam (1); the characteristics are: The frame beam (1) is perpendicular to the projection of the fire wall (9) on a horizontal plane and is arranged at intervals; The first column foot (21) is fixedly mounted on the end of the fire wall (9) away from the main transformer casing (61), and the second column foot (22) is fixedly mounted on the site table; the fire wall (9) is a frame structure; The connection end of the insulator string (3) away from the frame beam (1) is aligned vertically with the main transformer bushing (61), and the lower end of the lower lead (5) is connected to the main transformer terminal of the main transformer bushing (61); the lower lead (5) is perpendicular to the horizontal plane.

2. The main transformer frame suitable for high altitude and high intensity areas according to claim 1 is characterized in that: The top surfaces of the first column foot (21) and the second column foot (22) are flush and a top plate (23) is provided on the top surfaces of both, and the frame beam (1) is connected to the top plate (23).

3. The main transformer frame suitable for high altitude and high intensity areas according to claim 1 is characterized in that: A tie rod (24) is provided between the first column foot (21) and the second column foot (22), and the first column foot (21) and the second column foot (22) are connected via the tie rod (24); the distance between the upper ends of the first column foot (21) and the second column foot (22) is smaller than the distance between the lower ends of the first column foot (21) and the second column foot (22).

4. The main transformer frame suitable for high altitude and high intensity areas according to claim 1 is characterized in that: The fire wall (9) comprises a wall and a frame structure, wherein the frame structure comprises a plurality of frame columns (91); the bottom end of the first column foot (21) is fixedly mounted on the frame column (91) at the end of the fire wall (9).

5. The main transformer frame suitable for high altitude and high intensity areas according to claim 4 is characterized in that: A cup-shaped foundation (8) is provided on the site table and above the frame column (91) at the end of the fire wall (9); The lower end of the first column foot (21) is cast and fixed in the groove of the cup-shaped foundation (8) on the frame column (91), and the lower end of the second column foot (22) is cast and fixed in the groove of the cup-shaped foundation (8) on the site surface.

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