Installation device for zero sequence current transformer of offshore substation

Abstract

The utility model relates to the technical field of offshore substation equipment, in particular to a zero sequence current transformer mounting device for an offshore substation. The installation device comprises at least two stand columns used for jacking up the SF6 inflatable switch cabinet, a support is arranged in a space defined by the stand columns, and a zero sequence current transformer is fixed to the support. According to the mounting device, the height of the SF6 inflatable switch cabinet is increased by adopting the upright post, and the zero-sequence current transformer bracket is arranged between the SF6 inflatable switch cabinet and the deck, so that the zero-sequence current transformer can be arranged in a power distribution room nearby, the working reliability of the zero-sequence current transformer is ensured, and the design and equipment cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore substation equipment, in particular to an offshore substation zero-sequence current transformer installation device. Background Art

[0002] The development of offshore wind power will not only help the low-carbon transformation of energy, but also help improve energy security capabilities.

[0003] In an offshore wind power project, the offshore substation is the "heart" of the entire offshore wind power project. All the electricity generated by wind turbines is collected and boosted here, and then connected to the onshore power grid through transmission lines. Therefore, a reasonable offshore substation design is the key to the smooth operation of the project.

[0004] Taking into account the compact layout requirements of offshore substations, 35kV distribution devices generally use SF6 gas-filled switchgear. This layout saves space in the substation, but will result in the zero-sequence current transformer being unable to be installed in the bottom area of ​​the switchgear cabinet. The conventional practice is to set up a zero-sequence current transformer protection box on the lower floor of the 35kV distribution device room, fix the current transformer protection box to the bracket and weld it to the lower steel structure of the 35kV distribution room. The above conventional practice has the following disadvantages: 1) Increase the workload of the zero-sequence current transformer protection box design. 2) Considering the anti-corrosion requirements, this protection box is generally made of stainless steel, which increases the cost significantly. 3) More protection boxes occupy the space of the first floor of the substation. The first floor of the substation is usually used as a cable mezzanine. The protection box increases the difficulty of arranging cables, other pipelines and air ducts. 4) The outgoing cable of the zero-sequence current transformer needs to be laid from the protection box to the 35kV distribution room on the upper floor. This part of the cable is partially exposed to the outdoor environment and is easily affected by the external environment, causing disconnection, affecting the accuracy of the relevant protection action signal. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an offshore substation zero-sequence current transformer installation device which can ensure the working reliability of the zero-sequence current transformer and has low cost.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: an offshore substation zero-sequence current transformer installation device, comprising a device for installing SF 6 The inflatable switch cabinet has at least two upright columns at the top, and a bracket is arranged in the space surrounded by the upright columns, and the zero-sequence current transformer is fixed on the bracket.

[0007] Wherein, the support comprises two vertical channel steels and one transverse channel steel which are connected to each other in an N-shape.

[0008] Wherein, the free end of the vertical channel steel is connected to the bracket bottom plate.

[0009] Among them, one end of the vertical channel steel connected to the horizontal channel steel is provided with a screw hole, and the vertical channel steel is connected to the zero-sequence current transformer through the cooperation of the screw hole and the bolt.

[0010] It also includes a bracket bottom plate and a column bottom plate. The bracket is fixed on the deck through the bracket bottom plate, and the column is fixed on the deck through the column bottom plate.

[0011] Among them, the SF 6 An operating platform is provided below the inflatable switch cabinet, and the operating platform is connected to the column.

[0012] The beneficial effect of the utility model is that the zero-sequence current transformer installation device of the offshore substation adopts a column to improve the SF 6 Gas-filled switchgear height, and in SF 6 A zero-sequence current transformer bracket is arranged between the inflatable switch cabinet and the deck, so that the zero-sequence current transformer can be placed close to the distribution room, ensuring the reliability of the zero-sequence current transformer and saving design and equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure shows a schematic diagram of the structure of the zero-sequence current transformer installation device for offshore substation in the first embodiment of the utility model;

[0014] Figure 2 A top view of the bracket of the utility model;

[0015] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0016] Description of labels:

[0017] 1. Column base plate; 2. Bracket base plate; 3. Column; 4. Bracket; 41. Vertical channel steel; 411. Screw hole; 42. Horizontal channel steel; 5. Operating platform; 6. Bolt; 7. SF 6 Inflatable switch cabinet; 8. Deck; 9. Zero-sequence current transformer; 10. Sealing flange. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0019] Please refer to Figures 1 to 3 , an offshore substation zero-sequence current transformer installation device, comprising a device for 6 The inflatable switch cabinet has at least two upright columns at the top, and a bracket is arranged in the space surrounded by the upright columns, and the zero-sequence current transformer is fixed on the bracket.

[0020] From the above description, it can be seen that the beneficial effect of the utility model is that the installation device of the utility model can install the SF 6 The inflatable switch cabinet has a high top, and a bracket for installing the zero-sequence current transformer is set in the space surrounded by the columns. The installation device sets the zero-sequence current transformer on the installation SF 6 In the distribution room of the inflatable switchgear, compared with the conventional method of installing the zero-sequence current transformer on the steel structure below the distribution room, there is no need to set up an additional zero-sequence current transformer protection box, which saves design cost and equipment cost; it can also avoid the zero-sequence current transformer outlet cable being exposed to the outdoors, and the loss of protection signal caused by disconnection due to later factors; and reduce the space occupied by the lower platform layer, which is convenient for the layout of the cables, pipelines and air ducts on the lower platform. The installation device has a simple structure, is easy to install and disassemble, and is suitable for zero-sequence current transformers of any size.

[0021] Furthermore, the support comprises two vertical channel steels and one transverse channel steel which are connected to each other in an N-shape.

[0022] It can be seen from the above description that the support structure is stable.

[0023] Furthermore, the free end of the vertical channel steel (the end not connected to the transverse channel steel) is connected to the bracket bottom plate.

[0024] Furthermore, a screw hole is provided at one end where the vertical channel steel is connected to the horizontal channel steel, and the vertical channel steel is connected to the zero-sequence current transformer through the cooperation of the screw hole and the bolt.

[0025] From the above description, it can be seen that installing a zero-sequence current transformer at one end where the vertical channel steel is connected to the horizontal channel steel can improve the stability of the structure.

[0026] Furthermore, it also includes a bracket bottom plate and a column bottom plate, the bracket is fixed on the deck through the bracket bottom plate, and the column is fixed on the deck through the column bottom plate.

[0027] Furthermore, the bracket, bracket bottom plate and deck are welded in sequence from top to bottom, and the column, column bottom plate and deck are welded in sequence from top to bottom.

[0028] Furthermore, SF 6 An operating platform is provided under the inflatable switch cabinet, and the operating platform is connected to the column.

[0029] Please refer to Figures 1 to 3 , Embodiment 1 of the present utility model is:

[0030] A zero-sequence current transformer installation device for an offshore substation includes a column bottom plate 1, a bracket bottom plate 2, and two columns 3 for raising an SF6 gas-filled switch cabinet 7. A bracket 4 is provided in the space surrounded by the columns 3. A zero-sequence current transformer 9 is fixed on the bracket 4. The bracket 4, the bracket bottom plate 2, and the deck 8 are welded in sequence. The columns 3, the column bottom plate 1, and the deck 8 are welded in sequence. An operating platform 5 is provided below the SF6 gas-filled switch cabinet 7, and the operating platform 5 is connected to the column 3. The bracket 4 includes two vertical channel steels 41 and a horizontal channel steel 42 that are connected to each other in an n-shaped manner. The free end of the vertical channel steel 41 is connected to the bracket bottom plate 2. One end of the vertical channel steel 41 connected to the horizontal channel steel 42 is provided with a screw hole 411. The vertical channel steel 41 is connected to the zero-sequence current transformer 9 through the cooperation of the screw hole 411 and the bolt 6. A sealing flange 10 for fireproof sealing is provided on the deck 8.

[0031] In summary, the zero-sequence current transformer installation device for offshore substation provided by the utility model has the following advantages:

[0032] 1. No need to set up an additional protection box for the zero-sequence current transformer, saving design and equipment costs;

[0033] 2. It avoids the outgoing cable of the zero-sequence current transformer from being exposed outdoors, and avoids the loss of protection signal caused by disconnection due to later factors;

[0034] 3. Reduce the space occupied by the lower platform layer, which is convenient for the layout of cables, pipelines and air ducts on the lower platform;

[0035] 4. The structure is simple, stable, easy to install and disassemble, and suitable for zero-sequence current transformers 9 of any size. The above description is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent transformation made by using the contents of the utility model specification and drawings, or directly or indirectly used in related technical fields, is also included in the patent protection scope of the utility model.

Claims

1. An offshore substation zero-sequence current transformer installation device, characterized in that: It comprises at least two columns for raising the top of the SF6 gas-filled switch cabinet, a bracket is arranged in the space surrounded by the columns, and a zero-sequence current transformer is fixed on the bracket.

2. The installation device for zero-sequence current transformer of offshore substation according to claim 1, characterized in that: The support comprises two vertical channel steels and one transverse channel steel which are connected to each other in an N-shape.

3. The installation device for zero-sequence current transformer of offshore substation according to claim 2, characterized in that: The free end of the vertical channel steel is connected to the bracket bottom plate.

4. The installation device for zero-sequence current transformer of offshore substation according to claim 2, characterized in that: A screw hole is provided at one end where the vertical channel steel is connected to the horizontal channel steel, and the vertical channel steel is connected to the zero-sequence current transformer through the cooperation of the screw hole and the bolt.

5. The installation device for zero-sequence current transformer of offshore substation according to claim 1, characterized in that: It also includes a bracket bottom plate and a column bottom plate. The bracket is fixed on the deck through the bracket bottom plate, and the column is fixed on the deck through the column bottom plate.

6. The installation device for zero-sequence current transformer of offshore substation according to claim 1, characterized in that: An operating platform is provided below the SF6 gas-filled switch cabinet, and the operating platform is connected to the column.

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