500KV transformer low-voltage side connecting structure

Abstract

The utility model discloses a low-voltage side connecting structure of a 500kV transformer. The device comprises a main transformer and a tubular bus which are arranged in a transformer chamber, the tubular bus is a gas-insulated closed tubular bus, the tubular bus is supported in the transformer chamber through a support frame, and the tubular bus is connected with a second insulating sleeve on the main transformer through a first insulating sleeve. According to the utility model, the advantages of the gas insulation enclosed tubular bus are fully utilized, the tubular bus has no live-line distance requirement on surrounding facilities, the arrangement height of the tubular bus is basically equal to the height of the low-voltage side sleeve of the main transformer, and the tubular bus is connected with the low-voltage side sleeve of each phase of the main transformer through the insulation sleeve; and the connection and arrangement of high and medium voltage sides and neutral point bushings of the main transformer and a power distribution device are not influenced. Meanwhile, the gas insulation enclosed tubular bus is of a three-phase common box arrangement structure and is supported on the ground of a transformer room, so that the space can be effectively saved, the installation, operation and maintenance are relatively convenient, and the operation and maintenance safety is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of electrical technology, and specifically relates to a low-voltage side connection structure of a 500 kV transformer. Background Art

[0002] Indoor 500 kV substation, the low-voltage side bushing of the main transformer with phase arrangement needs to be connected with the low-voltage side busbar. Usually, the low-voltage side busbar of the indoor station is installed by insulator string suspension tube busbar, such as Figure 1 , Figure 2 As shown in the figure, the insulator string hanging point is on the roof of the main transformer room, and the three phases of the tube busbar are separated and connected to the low-voltage side bushing of the main transformer through soft wires. For indoor stations, each main transformer has three voltage level bushings of high voltage, medium voltage and low voltage connected to the distribution device. The main transformer room is compact, the live distance is tight, and the layout is difficult. The installation method of the suspended tube busbar has a high hanging point height, which is difficult to install and maintain. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the above-mentioned background technology and provide a 500 kV transformer low-voltage side connection structure.

[0004] The technical solution adopted by the utility model is: a 500 kV transformer low-voltage side connection structure, including a main transformer and a tubular bus arranged in a transformer room, the tubular bus is a gas-insulated closed tubular bus, the tubular bus is supported inside the transformer room by a supporting frame, and the tubular bus is connected to a second insulating bushing on the main transformer through a first insulating bushing.

[0005] Furthermore, the transformer room comprises three transformer sub-chambers arranged adjacent to each other, each transformer sub-chamber is provided with a main transformer, the tube busbar runs through the three transformer sub-chambers, and the three phases of the tube busbar are respectively connected to the three main transformers.

[0006] Furthermore, the support frame includes a plurality of pillars, the bottom ends of the pillars are fixed to the ground of the transformer room, and the top ends of the pillars are fixedly connected to the bottom of the tube busbar.

[0007] Furthermore, the tubular busbar and the first insulating sleeve are connected via a flange.

[0008] Furthermore, the first insulating sleeve and the second insulating sleeve are connected via a soft wire.

[0009] Furthermore, the first insulating sleeve is fixed to the top of the tube busbar.

[0010] Furthermore, the bottom of the first insulating sleeve is at the same height as the bottom of the second insulating sleeve.

[0011] Furthermore, the vertical distance between the center line of the tube busbar and the center of the second insulating sleeve is 2-3m.

[0012] Furthermore, the first insulating sleeve and the second insulating sleeve are both air insulating sleeves.

[0013] The beneficial effects of the utility model are:

[0014] The utility model makes full use of the advantages of the gas-insulated closed tube busbar. The tube busbar has no live distance requirements for surrounding facilities. Its layout height is basically the same as the height of the low-voltage side bushing of the main transformer. It is connected to the low-voltage side bushings of each phase of the main transformer through the insulating bushing, and does not affect the connection and layout of the high- and medium-voltage sides and neutral point bushings of the main transformer and the distribution device. At the same time, because the gas-insulated closed tube busbar is a three-phase common box layout structure and is supported on the ground of the transformer room, it can effectively save space, and installation, operation and maintenance are also relatively convenient, and the operation and maintenance safety is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a floor plan of the prior art.

[0016] Figure 2 for Figure 1 AA schematic diagram in .

[0017] Figure 3 This is a plan layout diagram of the utility model.

[0018] Figure 4 for Figure 3 Schematic diagram of the medium BB.

[0019] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0020] Figure 6 for Figure 3 Middle CC section.

[0021] In the figure, 1-main transformer room; 1.1-transformer sub-chamber; 2-main transformer; 3-tube busbar; 4-insulator string; 5-flexible wire; 6-support frame; 6.1-pillar; 7-first insulating sleeve; 8-second insulating sleeve; 9-flange. DETAILED DESCRIPTION

[0022] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 3-6 As shown, the utility model provides a 500 kV transformer low-voltage side connection structure, including a 500 kV main transformer 2 arranged in a transformer chamber 1 and a tubular bus 3 on the low-voltage side, wherein the tubular bus 3 is a gas-insulated closed tubular bus, and the tubular bus 3 is supported inside the transformer chamber 1 by a support frame 6, and the tubular bus 3 is connected to a second insulating bushing 8 on the main transformer 2 through a first insulating bushing 7.

[0024] The utility model makes full use of the advantages of the gas-insulated closed tube busbar. The tube busbar has no live distance requirements for surrounding facilities. Its layout height is basically the same as the height of the low-voltage side bushing of the main transformer. It is connected to the low-voltage side bushings of each phase of the main transformer through the insulating bushing, and does not affect the connection and layout of the high- and medium-voltage sides and neutral point bushings of the main transformer and the distribution device. At the same time, because the gas-insulated closed tube busbar is a three-phase common box layout structure and is supported on the ground of the transformer room, it can effectively save space, and installation, operation and maintenance are also relatively convenient, and the operation and maintenance safety is greatly improved.

[0025] As a preferred solution, the transformer chamber 1 includes three adjacent transformer chambers 1.1, each transformer chamber 1.1 is provided with a main transformer 2, the high-voltage side of the main transformer 2 is connected to the high-voltage side bus through a corresponding bushing, one end of the tube bus 3 passes through the three transformer chambers 1.1, the three phases of the tube bus 3 are respectively connected to the low-voltage sides of the three main transformers 2, each phase is connected to the main transformer 2 through two first insulating bushings 7, and the other end of the tube bus 3 extends out of the transformer chamber for connecting 66kV equipment.

[0026] As a preferred solution, the support frame 6 includes a plurality of pillars 6.1, the bottom ends of the pillars 6.1 are fixed to the ground of the transformer room 1, and the top ends of the pillars 6.1 are fixedly connected to the bottom of the tube bus 3. Each transformer sub-chamber 1.1 supports the tube bus 3 through two, three or four pillars 6.1, and the pillars 6.1 are conventional columnar structures. The tube bus is supported by pillars, which is low in height, simple in structure, and more convenient to install and maintain.

[0027] As a preferred solution, the tubular busbar 3 is connected to the first insulating bushing 7 via a flange 9. Specifically, a circular hole is opened at the top of the tubular busbar as close as possible to the second insulating bushing on the main transformer and a flange is installed. The first insulating bushing 7 is vertically fixed to the top of the flange 9, so that the distance between the first insulating bushing and the second insulating bushing is small, and the corresponding phase of the tubular busbar is connected to the second insulating bushing on the main transformer of the corresponding phase through a lead-out.

[0028] As a preferred solution, the first insulating sleeve 7 and the second insulating sleeve 8 are connected by a soft wire 5. To simplify the line layout, the bottom of the first insulating sleeve 7 is at the same height as the bottom of the second insulating sleeve 8, that is, the height of the tube busbar is substantially the same as the height of the second insulating sleeve, which is more convenient for line connection.

[0029] As a preferred solution, although the busbar 3 has no live distance requirement for surrounding facilities, in order to further improve the safety of the equipment, the vertical distance L between the center line of the busbar 3 and the center of the second insulating sleeve 8 is designed to be 2-3m, preferably 2.5m.

[0030] As a preferred solution, the first insulating sleeve 7 and the second insulating sleeve 8 are both conventional air insulating sleeves.

[0031] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A 500 kV transformer low voltage side connection structure, comprising a main transformer (2) and a tube bus (3) arranged in a transformer room (1), characterized in that: The tubular busbar (3) is a gas-insulated closed tubular busbar, the tubular busbar (3) is supported inside the transformer chamber (1) via a support frame (6), and the tubular busbar (3) is connected to a second insulating bushing (8) on the main transformer (2) via a first insulating bushing (7).

2. The 500 kV transformer low voltage side connection structure according to claim 1 is characterized in that: The transformer room (1) comprises three transformer sub-chambers (1.1) arranged adjacent to each other, each transformer sub-chamber (1.1) being provided with a main transformer (2), the tube bus (3) passing through the three transformer sub-chambers (1.1), and the three phases of the tube bus (3) being respectively connected to the three main transformers (2).

3. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The support frame (6) comprises a plurality of pillars (6.1), the bottom ends of the pillars (6.1) are fixed to the ground of the transformer room (1), and the top ends of the pillars (6.1) are fixedly connected to the bottom of the tube busbar (3).

4. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The tube busbar (3) and the first insulating sleeve (7) are connected via a flange (9).

5. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The first insulating sleeve (7) and the second (8) are connected via a soft wire (5).

6. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The first insulating sleeve (7) is fixed to the top of the tube busbar (3).

7. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The bottom of the first insulating sleeve (7) is at the same height as the bottom of the second insulating sleeve (8).

8. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The vertical distance (L) between the center line of the tube busbar (3) and the center of the second insulating sleeve (8) is 2-3m.

9. The 500 kV transformer low voltage side connection structure according to claim 1, characterized in that: The first insulating sleeve (7) and the second insulating sleeve (8) are both air-insulated sleeves.

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