On-site maintenance method for extra-high voltage converter transformer
By building a temporary factory for maintenance including external dust room and internal dust room, and using maintenance equipment and operation auxiliary equipment, the problem of on-site maintenance of ultra-high voltage converter transformers has been solved, low-cost and efficient on-site maintenance has been achieved, and the floor area and project construction cycle have been saved.
Patent Information
- Application Number
- CN202411918321.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-03-25
AI Technical Summary
The prior art is difficult to carry out on-site maintenance of ultra-high voltage converter transformers at low cost and efficiently, due to on-site weather, temperature and humidity, wind and other conditions, and there is a lack of suitable maintenance work space on site.
Build a temporary factory for maintenance including an external dust room and an internal dust room. The external dust room is used to place maintenance equipment and external components. The internal dust room is used to place environmental control equipment and fuel tank maintenance. Environmental isolation is achieved through internal and external separation devices, and maintenance tasks are completed using maintenance equipment and operation auxiliary equipment.
The on-site cover maintenance and body maintenance of ultra-high voltage converter transformers have been realized, which saves the floor area and project construction cycle, reduces the project cost, and improves maintenance efficiency and safety.
Smart Images
Figure CN119695681A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of power transformers, and in particular relates to an on-site maintenance method for an ultra-high voltage converter transformer. Background Art
[0002] At present, the construction of UHV converter stations often faces the problem of poor transportation conditions for large equipment. The transportation and construction supporting measures required for large equipment are complex and costly, and many supporting measures are temporary construction and reinforcement measures.
[0003] After the UHV converter station project is completed and put into operation, if the UHV converter transformer fails and needs to be repaired, the transportation cycle of returning to the factory for repair is long, and there are uncertain factors such as difficulty in transporting large equipment and high costs; if the repair is carried out at the on-site workstation of the UHV converter transformer, it is limited by the on-site weather, temperature, humidity, wind and other conditions and the high risks of moisture and pollution of the UHV converter transformer, as well as the lack of space for body repair work. There are no application cases in the industry. The on-site professional maintenance temporary plant is mainly used for the on-site dismantling, assembly, installation and maintenance of the UHV converter transformer. Due to the long construction period and high construction cost of the on-site professional maintenance temporary plant, it is currently only built in UHV converter stations that do not have the conditions for transporting UHV converter transformers. Therefore, how to realize the on-site maintenance of UHV converter transformers at low cost and high efficiency has become a technical problem that needs to be solved urgently. Summary of the invention
[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology, to provide a temporary maintenance plant with a short construction period, low engineering cost, and the ability to meet the needs of on-site maintenance of ultra-high voltage converter transformers, thereby realizing on-site maintenance of ultra-high voltage converter transformers. The technical solution adopted by the present invention is: A method for on-site maintenance of a UHV converter transformer comprises building a temporary maintenance plant including an outer dustproof room and an inner dustproof room, placing maintenance equipment, external components of the UHV converter transformer and maintenance materials in the outer dustproof room, and placing environmental dust reduction and temperature and humidity control equipment, maintenance operation auxiliary equipment and an oil tank of the UHV converter transformer in the inner dustproof room; the maintenance equipment in the outer dustproof room comprises at least one vacuum unit and at least one dry air generator; the environmental dust reduction and temperature and humidity control equipment installed in the inner dustproof room comprises at least one air filter device, at least four high-temperature air conditioners, at least two dehumidifiers, a dustproof shed and temperature and humidity detection equipment; the maintenance operation auxiliary equipment comprises a set of assembly racks, a lifting vehicle and a vacuum cleaner; the inner dustproof room and the outer dustproof room share a double-beam bridge crane; an inner and outer partition device is provided between the outer dustproof room and the inner dustproof room; When the UHV converter transformer needs to be overhauled on site, the oil tank of the UHV converter transformer is transported to the inner dustproof room, and the inner and outer isolation devices are completely closed; the dust reduction and temperature and humidity in the inner dustproof room are adjusted to indicators that can meet the maintenance requirements, and after the inspection and maintenance are completed and cleaned using the maintenance equipment, the oil tank of the UHV converter transformer is transported to the outer dustproof room, and the inspection and maintenance are completed using maintenance auxiliary equipment; during the maintenance process, the components of the UHV converter transformer that need to be removed are transported to the outer dustproof room for temporary storage, and the box cover and switch of the UHV converter transformer are hoisted to the outer dustproof room for temporary storage using a double-beam bridge crane.
[0005] Preferably, the internal and external separation device includes a steel structure beam, a steel pipe and a windproof thickened tarpaulin. The steel structure beam is fixedly installed on the steel structure on the top of the temporary factory building. Light rail wheels are installed on the top and bottom ends of the steel pipe. Top and bottom slide rails that cooperate with the light rail wheels are provided on the steel structure beam and the ground. The top of the windproof thickened tarpaulin is fixedly connected to the top of the steel pipe, and the steel pipe at the end is connected to the forward and reverse motor through a wire rope transmission. The windproof thickened tarpaulin adopts a polyethylene tarpaulin. When the windproof thickened tarpaulin is in a closed state, sandbags are used to assist in compacting and fixing the lower end of the windproof thickened tarpaulin.
[0006] Preferably, the vacuum unit is a movable vacuum unit equipped with universal wheels, the dry air generator is a movable dry air generator equipped with universal wheels, the air filtration equipment is a movable air filtration equipment equipped with universal wheels, the high-temperature air conditioner is a fixed high-temperature air conditioner, the dehumidifier is a fixed dehumidifier, the dehumidifier is arranged in the middle of the high-temperature air conditioner, and the temperature and humidity detection equipment is a temperature and humidity meter.
[0007] Preferably, the plane structure of the temporary factory building is rectangular, the entrance door of the temporary factory building is located in the middle of the short axis side, and the entrance door is a side sliding door structure.
[0008] Preferably, the maintenance work auxiliary equipment in the inner dustproof room includes a group of movable assembly racks, which are placed on both sides of the long axis direction of the oil tank and a movable lifting vehicle arranged on the short axis side of the oil tank.
[0009] Preferably, the inner dustproof chamber and the outer dustproof chamber are steel structure bodies, and the outside is covered with color steel plates.
[0010] Beneficial effects of the present invention: The on-site maintenance method for the ultra-high voltage converter transformer provided by the present invention has a temporary maintenance plant with a simple structure and is easy to build. The cover and body maintenance of the ultra-high voltage converter transformer can be carried out on-site. Compared with on-site professional maintenance temporary plants, the temporary maintenance plant saves floor space, construction period and construction cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a temporary maintenance plant in an embodiment of the present invention; Figure 2 is a schematic diagram of a maintenance work auxiliary device according to an embodiment of the present invention; In the figure, 1 is an outer dustproof room, 2 is an inner dustproof room, 3 is an entrance door, 4 is a double-beam bridge crane, 5 is a vacuum unit, 6 is a dry air generator, 7 is a high-temperature air conditioner, 8 is a dehumidifier, 9 is an air filtration device, 10 is an ultra-high voltage converter transformer oil tank, 11 is an assembly rack, 12 is a lifting vehicle, 13 is an inner and outer partition device, 14 is a steel structure beam, 15 is a steel pipe, 16 is a forward and reverse motor, 17 is a sandbag, and 18 is a windproof thickened tarpaulin. DETAILED DESCRIPTION
[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] like Figure 1 , 2 A method for on-site maintenance of an ultra-high voltage converter transformer is required. First, a temporary maintenance building is built, including a temporary maintenance building body. The temporary maintenance building body includes an outer dustproof room 1 and an inner dustproof room 2. The outer dustproof room 1 is used for placing maintenance equipment required for maintenance work, placing external components of the ultra-high voltage converter transformer, and unpacking and cleaning maintenance material packaging boxes. The inner dustproof room 2 is used for the maintenance of the ultra-high voltage converter transformer oil tank 10. Environmental dust reduction and temperature and humidity control equipment and maintenance operation auxiliary equipment are placed in the inner dustproof room 2.
[0014] In the embodiment of the present invention, the plane structure of the temporary maintenance building is rectangular, and the access door 3 of the temporary maintenance building is located in the middle of the short axis side (right side); the access door 3 is a side sliding door structure, and the access door 3 is provided for transporting the UHV converter transformer oil tank 10 and other equipment to the outer dustproof room 1 and the inner dustproof room 2.
[0015] The maintenance equipment in the outer dustproof room 1 includes at least one vacuum unit 5 and a dry air generator 6. The vacuum unit 5 is a movable vacuum unit 5 with universal wheels for vacuuming the oil tank and components of the UHV converter transformer, such as the equipment with model VG4200, with a vacuuming speed of 4200m / s. 3 / h, meeting the requirement of vacuuming the oil tank to 30Pa. The dry air generator 6 is a movable dry air generator 6 with universal wheels for continuously blowing dry air into the oil tank and the inner dustproof chamber 2 during the maintenance of the UHV converter transformer oil tank 10. For example, the model is AD100, and the dry air flow rate is 100m 3 / h, dew point ≤-65℃.
[0016] It also includes an internal and external partition device 13 between the outer dustproof chamber 1 and the inner dustproof chamber 2. The internal and external partition device 13 is used to achieve environmental isolation between the inner dustproof chamber 2 and the outer dustproof chamber 1 during maintenance work, and to achieve different environmental control in the inner dustproof chamber 2 and the outer dustproof chamber 1 during the maintenance process, especially to ensure the independent environment inside the inner dustproof chamber 2, so that the ambient temperature, ambient humidity and dust reduction of the inner dustproof chamber 2 meet the maintenance work requirements of the ultra-high voltage converter transformer oil tank 10. The internal and external separation device 13 in this embodiment includes a steel structure beam 14, a steel pipe 15 and a windproof thickened tarpaulin 18. The windproof thickened tarpaulin 18 is made of a polyethylene tarpaulin with a thickness of 0.6 mm. The steel structure beam 14 is fixedly installed on the steel structure on the top of the temporary factory building. Light rail wheels are installed at the top and bottom of the steel pipe 15. The steel structure beam 14 and the ground are provided with top and bottom slide rails that cooperate with the light rail wheels. The top of the windproof thickened tarpaulin 18 is fixedly connected to the top of the steel pipe 15. The steel pipe 15 at the end is connected to the forward and reverse motor 16 through a wire rope transmission. The forward and reverse motor 16 cooperates with the wire rope to drive the steel pipe 15 at the end to slide, so as to realize the rapid opening and closing of the windproof thickened tarpaulin 18. When the windproof thickened tarpaulin 18 is in a closed state, a sandbag 17 is used to assist in compacting and fixing the lower end of the windproof thickened tarpaulin 18.
[0017] The environmental dust reduction and temperature and humidity control equipment installed in the inner dustproof room 2 includes at least one air filtration device 9, at least four high-temperature air conditioners 7, at least two dehumidifiers 8, a dustproof shed and temperature and humidity detection equipment; the maintenance work auxiliary equipment includes a set of assembly racks 11, a lifting vehicle 12 and a vacuum cleaner, and a set of assembly racks 11 are arranged in parallel on both sides of the UHV converter transformer oil tank 10. The inner dustproof room 2 and the outer dustproof room 1 share a double-beam bridge crane 4 with a lifting capacity of 32 tons.
[0018] The inner dustproof room 2 and the outer dustproof room 1 in this embodiment are steel structure bodies, and the outside is covered with color steel plates to meet the maintenance environment requirements such as windproof and rainproof. Modular building materials are used to facilitate transportation and on-site assembly.
[0019] The environment control device in the inner dustproof room 2 of this embodiment includes a movable air filter device 9 with universal wheels for controlling the dust reduction amount in the inner dustproof room 2, such as KJ1200F, with an air volume of 1000m 3 / h, control the dust fall amount in the inner dustproof room 2 ≤15mg / (m3 × days); a fixed high-temperature air conditioner 7 for ambient temperature control arranged near the four corners of the square of the inner dustproof room 2, and a fixed dehumidifier 8 for ambient air dehumidification arranged in the middle of the high-temperature air conditioner 7 in the long axis direction of the inner dustproof room 2, the above equipment is used to control the ambient temperature in the inner dustproof room 2 to 16℃~28℃, and the humidity ≤50%RH; a temperature and humidity meter with a temperature measurement accuracy of not less than ±1℃ and a humidity measurement accuracy of not less than ±2%RH, placed at the flange mouth of the oil tank opened during maintenance to detect the temperature and humidity conditions to meet the maintenance requirements.
[0020] The maintenance auxiliary equipment in the inner dustproof room 2 in this embodiment includes a group of movable assembly racks 11 for maintenance workers to work at a high position on the long axis side of the oil tank, placed on both sides of the long axis direction of the oil tank, a movable lifting vehicle 12 for workers to work at a high position on the short axis side of the oil tank, a double-beam bridge crane 4 and a dust collector that meet the requirements of lifting components such as the tank cover and switches, so as to facilitate the completion of maintenance work such as lifting cover maintenance and body maintenance in the temporary maintenance workshop. The number of the above equipment is appropriate to meet the temperature, humidity, dust reduction and other conditions required for maintenance.
[0021] When the UHV converter transformer needs to be overhauled on site, the UHV converter transformer oil tank 10 is cleaned and transported to the inner dustproof chamber 2, and the inner and outer isolation devices 13 between the dustproof chamber 1 and the inner dustproof chamber 2 are completely closed; after the inspection, maintenance and cleaning are completed using the overhaul equipment, the UHV converter transformer oil tank 10 is transported to the outer dustproof chamber 1, and after the inspection, maintenance and cleaning are completed using the overhaul operation auxiliary equipment, the oil tank 10 is transported to the UHV converter station for installation of the UHV converter transformer oil tank 10.
[0022] During the maintenance process, the components that need to be removed, such as the bushing, riser, oil storage cabinet, and cooler of the UHV converter transformer, are transported to the outer dustproof room 1 for temporary rainproof storage. The components that need to be removed during the maintenance process, such as the box cover and switch of the UHV converter transformer, are hoisted to the outer dustproof room 1 by a double-beam bridge crane 4 for temporary storage.
[0023] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.
[0024] The above description is only a preferred embodiment of the present invention and does not limit the structure of the present invention in any form.
Claims
1. A method for on-site maintenance of a UHV converter transformer, comprising building a temporary maintenance plant including an outer dustproof room and an inner dustproof room, characterized in that: Maintenance equipment, external components of the UHV converter transformer and maintenance materials are placed in the outer dustproof room, and environmental dust reduction and temperature and humidity control equipment, maintenance operation auxiliary equipment and the UHV converter transformer oil tank are placed in the inner dustproof room; the maintenance equipment in the outer dustproof room includes at least one vacuum unit and at least one dry air generator; the environmental dust reduction and temperature and humidity control equipment installed in the inner dustproof room includes at least one air filtration device, at least four high-temperature air conditioners, at least two dehumidifiers, a dustproof shed and temperature and humidity detection equipment, the maintenance operation auxiliary equipment includes a set of assembly racks, a lifting vehicle and a vacuum cleaner, and the inner and outer dustproof rooms share a double-beam bridge crane; an inner and outer partition device is set between the outer dustproof room and the inner dustproof room; When the UHV converter transformer needs to be overhauled on site, the oil tank of the UHV converter transformer is transported to the inner dustproof room, and the inner and outer isolation devices are completely closed; Adjust the environmental dust reduction, temperature and humidity in the inner dustproof room to indicators that can meet the maintenance requirements. After using the maintenance equipment to complete the inspection, maintenance and cleaning, transport the UHV converter transformer tank to the outer dustproof room, and use the maintenance operation auxiliary equipment to complete the inspection and maintenance. During the maintenance process, the components of the UHV converter transformer that need to be removed are transported to the outer dustproof room for temporary storage, and the box cover and switch of the UHV converter transformer are lifted by a double-beam bridge crane to the outer dustproof room for temporary storage.
2. The on-site maintenance method for a UHV converter transformer according to claim 1, characterized in that: The internal and external separation device includes a steel structure beam, a steel pipe and a windproof thickened tarpaulin. The steel structure beam is fixedly installed on the steel structure on the top of the temporary factory building. Light rail wheels are installed at the top and bottom ends of the steel pipe. Top and bottom slide rails that cooperate with the light rail wheels are arranged on the steel structure beam and the ground. The top of the windproof thickened tarpaulin is fixedly connected to the top of the steel pipe, and the steel pipe at the end is connected to the forward and reverse motor through a wire rope transmission. The windproof thickened tarpaulin adopts a polyethylene tarpaulin. When the windproof thickened tarpaulin is in a closed state, sandbags are used to assist in compacting and fixing the lower end of the windproof thickened tarpaulin.
3. The on-site maintenance method for ultra-high voltage converter transformer according to claim 1, characterized in that: The vacuum unit is a movable vacuum unit equipped with universal wheels, the dry air generator is a movable dry air generator equipped with universal wheels, the air filtering device is a movable air filtering device equipped with universal wheels, the high-temperature air conditioner is a fixed high-temperature air conditioner, the dehumidifier is a fixed dehumidifier, the dehumidifier is arranged in the middle of the high-temperature air conditioner, and the temperature and humidity detection equipment is a temperature and humidity meter.
4. The on-site maintenance method for a UHV converter transformer according to claim 1, characterized in that: The plane structure of the temporary factory building is rectangular, and the entrance door of the temporary factory building is located in the middle of the short axis side, and the entrance door is a side sliding door structure.
5. The on-site maintenance method for UHV converter transformer according to claim 1, characterized in that: The auxiliary equipment for maintenance work in the inner dustproof room includes a group of movable assembly racks, which are placed on both sides of the long axis direction of the oil tank and a movable lifting vehicle arranged on the short axis side of the oil tank.
6. The on-site maintenance method for a UHV converter transformer according to any one of claims 1 to 5, characterized in that: The inner dustproof room and the outer dustproof room are steel structure bodies, and the outside is covered with color steel plates.