Box-in top noise reduction device suitable for converter transformer of extra-high voltage converter station

Abstract

The invention discloses a Box-in top noise reduction device suitable for a converter transformer of an extra-high voltage converter station. The Box-in top noise reduction device comprises a grating frame arranged on the top of the converter transformer, sound insulation plates arranged on the two sides of the top of the converter transformer and an external controller. Liftable hooks are installed on the edges of the two sides of the grating frame respectively, the hook on each side of the grating frame is connected with the sound insulation plate on the same side, and the sound insulation plates can ascend and descend along with ascending and descending of the hooks. The sound insulation plate comprises a mounting frame, two layers of flame-retardant plates and a sound insulation material, the two layers of flame-retardant plates are mounted on the mounting frame, the space between the two layers of flame-retardant plates is filled with the sound insulation material, a temperature sensor is arranged on the grating frame, and the external controller is in communication connection with the temperature sensor and the hook. The device can meet the requirements of sound insulation and noise reduction during daily operation of the converter transformer, can be conveniently operated, maintained and overhauled, can adapt to automatic falling of the converter transformer when a fire disaster occurs, is simple in design, and can be widely applied to noise treatment of converter stations and fire protection transformation.

Description

Technical Field

[0001] The present invention belongs to the field of noise reduction of electric power equipment, and in particular relates to a noise reduction device for the top of a Box-in converter transformer applicable to an ultra-high voltage converter station. Background Art

[0002] Ultra-high voltage (UHV) transmission meets the requirements of large-scale, long-distance, and highly efficient power transmission, improves environmental quality, and becomes a key means of addressing the inverse distribution of energy resources and load centers, significantly promoting economic and social development. However, with the continued strengthening of environmental legislation and increasing public awareness, substandard noise levels at converter station boundaries not only negatively impact UHVDC transmission projects, but also increase construction time and investment, potentially risking delayed commissioning. UHV converter station boundary noise primarily originates from outdoor noise-generating equipment, such as converter transformers. Currently, both domestically and internationally, converter transformers in UHV converter stations are treated using a box-in solution. This involves enclosing the converter transformer in a removable soundproof chamber equipped with ventilation and heat dissipation mufflers to reduce noise. However, due to the confined space, if a converter transformer malfunctions and ignites a fire, the sudden increase in pressure within the box-in chamber could cause an explosion, irreversibly damaging surrounding equipment and resulting in significant economic losses. Therefore, it is necessary to take necessary equipment protection measures and improve the top structure of the converter transformer Box-in without affecting the normal operation of the converter transformer to minimize the economic losses caused by emergencies. Summary of the Invention

[0003] In view of this, the present invention provides a noise reduction device for the top of a converter transformer box-in of an ultra-high voltage converter station, which can solve the noise problems caused by fire protection and sealing in the converter transformer box-in of the converter station in the prior art.

[0004] The embodiment of the present invention discloses the following technical solutions:

[0005] A noise reduction device for the top of a box-in converter transformer in an ultra-high voltage converter station comprises: a grille mounted on the top of the converter transformer, sound insulation panels mounted on both sides of the top of the converter transformer, and an external controller. Liftable hooks are mounted on the edges of both sides of the grille, with the hooks on each side of the grille connected to the sound insulation panels on the same side, allowing the panels to rise and fall as the hooks rise and fall. The sound insulation panels comprise a mounting frame, two layers of flame-retardant panels, and sound insulation material. The two layers of flame-retardant panels are mounted on the mounting frame, with the sound insulation material filled between the two layers of flame-retardant panels. A temperature sensor is mounted on the grille, and the external controller is in communication with the temperature sensor and the hooks.

[0006] Further: the partition brackets used to form the grid in the grid frame are inclined.

[0007] Furthermore: the grid frame is formed by assembling a plurality of grid plates, and two adjacent grid plates are connected together by a U-shaped buckle with an opening facing downward.

[0008] Further: the surface of the grid plate is coated with anti-corrosion paint to make the surface of the grid plate rough.

[0009] Furthermore: the area of the sound insulation board is larger than the area of the grille board.

[0010] Further: the material of the grid plate is steel.

[0011] Further: when the converter transformer operates normally, the external controller controls the hook to be locked so that the sound insulation board is located on both sides of the top of the converter transformer;

[0012] When a fire occurs inside the converter transformer and the temperature detected by the temperature sensor exceeds a preset threshold, the external controller controls the hook to descend, so that the sound insulation board descends to the ground.

[0013] Furthermore: the flame retardant board is made of a material containing nitrogen-based flame retardant.

[0014] Further: the sound insulation material is C&E-2001 sound absorbing material.

[0015] Furthermore: support frames are respectively provided on both sides of the converter transformer, and the top ends of the support frames on each side of the converter transformer are connected to the edges of the grid frame on the same side.

[0016] In this way, the embodiment of the present invention adopts such a structural setting, which can not only meet the needs of sound insulation and noise reduction during daily operation of the converter transformer, but also facilitate operation, maintenance and repair. It can also adapt to automatic shedding in the event of a fire in the converter transformer. The design is simple and can be widely used in noise control and fire protection renovation of converter stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 Schematic diagram of a top noise reduction device for a converter transformer Box-in in a UHV converter station according to an embodiment of the present invention;

[0019] Figure 2is a schematic diagram of a liftable sound insulation board according to an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a grid frame with inclined partition brackets according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] The embodiment of the present invention discloses a noise reduction device for the top of the UHV converter transformer Box-in, which is applicable to the original closed structure of the top of the UHV converter transformer Box-in. Figures 1 to 3 As shown, the device includes: a grid frame 1 arranged on the top of the converter transformer, sound insulation boards 2 arranged on both sides of the top of the converter transformer, and an external controller.

[0023] The edges of both sides of the grille 1 are each mounted with a retractable hook 6. The hook 6 can be an electromagnetic hook, raised and lowered by means of an electromagnetically controlled retractable rope. The hook 6 on each side of the grille 1 connects to the sound insulation panel 2 on the same side, allowing the panel 2 to rise and fall with the hook 6. The sound insulation panel 2 comprises a mounting frame 3, two layers of flame-retardant panels 4, and sound insulation material 5. The two layers of flame-retardant panels 4 are mounted on the mounting frame 3. The mounting frame 3 supports the flame-retardant panels 4, making the structure more stable. The sound insulation material 5 is filled between the two layers of flame-retardant panels 4. The flame-retardant panels 4 are made of a material containing a nitrogen-based flame retardant. This synthetic material has high flame retardancy, low toxicity, and excellent heat resistance. When decomposed at high temperatures, it produces low smoke and releases non-combustible gases such as CO2 and HN3, reducing the combustion rate. The sound insulation material 5 is C&E-2001 sound-absorbing material, which is based on a 41-pound per cubic foot Portland cement formula. The material is corrosion-resistant, fire-resistant, and non-combustible, and has good sound absorption performance. It plays a role in sound insulation and noise reduction under normal operating conditions of the converter transformer.

[0024] A temperature sensor is provided on the grid frame 1. An external controller is in communication with the temperature sensor and the hook 6.

[0025] The principle of this device is as follows: when the converter transformer is operating normally, the external controller controls the hook 6 to lock, so that the sound insulation board 2 is located on both sides of the top of the converter transformer; when a fire occurs inside the converter transformer and the temperature detected by the temperature sensor exceeds a preset threshold, the external controller controls the hook 6 to descend, so that the sound insulation board 2 descends to the ground.

[0026] Specifically, support frames are respectively provided on both sides of the converter transformer. The top ends of the support frames on each side of the converter transformer are connected to the edges of the grid frame 1 on the same side, thereby supporting the grid frame 1.

[0027] In a preferred embodiment, if Figure 3 As shown, the partition brackets used to form the grid in the grid frame 1 are tilted. When the converter transformer is in operation, the tilted design can refract the noise generated by the converter transformer, further reducing the noise generated by the converter transformer.

[0028] Therefore, by providing the sound insulation board 2 and the grid frame 1 with an inclined angle, the noise of the converter transformer can be insulated and reduced during normal operation of the converter transformer. When a fire occurs in the converter transformer, fire fighting will not be affected, and maintenance personnel can perform some maintenance work on the converter transformer on the grid frame 1.

[0029] The total load-bearing capacity of the grid frame 1 can reach 500kg, which is convenient for 2 to 3 maintenance personnel to carry out maintenance work on it smoothly.

[0030] In a preferred embodiment, the grid frame 1 is formed by assembling a plurality of grid plates. A grid plate may include a plurality of grids. Two adjacent grid plates are connected together by a U-shaped clip with the opening facing downward. That is, the contact edge brackets of the two adjacent grid plates are embedded in the U-shaped clip. More preferably, the contact edge brackets of the two adjacent grid plates and the U-shaped clip can be connected and fastened by engaging bolts and nuts. The size of the opening of the U-shaped clip can be selected according to actual conditions to adapt to the grid plates to be connected. The distance between adjacent U-shaped clips can be set according to actual conditions, for example, 30 mm apart. This design makes it easy to assemble different numbers of grid plates according to the floor space of the converter transformer to adapt to the converter transformer; it is also easy to disassemble.

[0031] More preferably, the grid plate is made of steel. The surface of the grid plate is coated with anti-corrosion paint to make the surface of the grid plate rough, thereby further absorbing the noise generated by the converter transformer. In addition, the area of the sound insulation board 2 is larger than the area of the grid plate.

[0032] The process of using the device is as follows:

[0033] When the converter transformer is operating normally, the ambient temperature is normal, the top structure remains unchanged, and the grid 1 is performing well, the sound insulation panels 2 and grid 1 primarily serve to isolate and reduce noise. If a fire occurs inside the converter transformer, the flame-retardant material of the sound insulation panels 2 prevents the fire from spreading. When the temperature detected by the temperature sensor exceeds a preset threshold, the external controller activates the extension cord of the hook 6, rapidly lowering the sound insulation panels 2 to the ground. This exposes the entire top of the converter transformer to air, freeing it from obstruction. Firefighting foam and water can be sprayed directly onto the top of the converter transformer, facilitating fire extinguishing.

[0034] In summary, the embodiments of the present invention can not only meet the needs for sound insulation and noise reduction during daily operation of the converter transformer, but also facilitate operation, maintenance and repair. It can also adapt to automatic shedding in the event of a fire in the converter transformer. It has a simple design and can be widely used in noise control and fire protection renovation in converter stations.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A noise reduction device for the top of a converter transformer box-in in a UHV converter station, characterized in that: include: A grid frame is provided on the top of a converter transformer, sound insulation panels are provided on both sides of the top of the converter transformer, and an external controller; the edges of both sides of the grid frame are respectively installed with liftable hooks, and the hooks on each side of the grid frame are connected to the sound insulation panels on the same side, so that the sound insulation panels can be raised and lowered as the hooks are raised and lowered; the sound insulation panels include: a mounting frame, two layers of flame retardant panels, and sound insulation material, the two layers of flame retardant panels being installed on the mounting frame, and the sound insulation material being filled between the two layers of flame retardant panels; a temperature sensor is provided on the grid frame, and the external controller is in communication with the temperature sensor and the hooks.

2. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 1 is characterized in that: The partition brackets for forming the grid in the grid frame are inclined.

3. The top noise reduction device for a UHV converter transformer Box-in according to claim 1 is characterized in that: The grid frame is formed by assembling a plurality of grid plates, and two adjacent grid plates are connected together by U-shaped buckles with downward openings.

4. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 3 is characterized by: The surface of the grid plate is coated with anti-corrosion paint to make the surface of the grid plate rough.

5. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 3 is characterized by: The area of the sound insulation board is larger than that of the grille board.

6. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 3 is characterized by: The material of the grid plate is steel.

7. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 1 is characterized in that: When the converter transformer operates normally, the external controller controls the hook to lock so that the sound insulation board is located on both sides of the top of the converter transformer; When a fire occurs inside the converter transformer and the temperature detected by the temperature sensor exceeds a preset threshold, the external controller controls the hook to descend, so that the sound insulation board descends to the ground.

8. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 1 is characterized in that: The flame retardant plate is made of a material containing a nitrogen-based flame retardant.

9. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 1 is characterized in that: The sound insulation material is C&E-2001 sound absorbing material.

10. The top noise reduction device for a converter transformer box-in in a UHV converter station according to claim 1 is characterized in that: Support frames are respectively provided on both sides of the converter transformer, and the top ends of the support frames on each side of the converter transformer are connected to the edges of the grid frame on the same side.

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