Draw-out type dry-type transformer cooling device

Abstract

The utility model relates to the technical field of dry-type transformer cooling, in particular to a drawable dry-type transformer cooling device. The drawable dry-type transformer cooling device comprises a main body unit and a maintenance mechanism, the main body unit comprises a transformer shell, and a maintenance window is formed in the transformer shell; a plurality of maintenance mechanisms are arranged; the maintenance mechanism comprises a cooling fan, a displacement base, a sliding rail and rollers; the two sliding rails are arranged in parallel, one end of each sliding rail is connected with a transformer shell, a transformer winding base is connected below the sliding rails, a displacement base is placed on the sliding rails through rollers, and a cooling fan is placed above the base. According to the device, the cooling fan is placed on the displacement base, the sliding rail is installed below the displacement base, after the overhauling window is opened, the displacement base is pulled out, and the cooling fan can be taken out under the condition that the cooling fan does not enter a transformer shell, so that overhauling or replacement is achieved, operators can be prevented from getting close to electrified parts, and the safety of the operators is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of dry variable cooling technology, and in particular to a removable dry variable cooling device. Background Technology

[0002] Most dry-type transformers currently use bottom air cooling, typically with the cooling fan fixedly installed at the bottom of the transformer windings. However, due to prolonged operation, these fans age, and their lifespan is significantly reduced under high-temperature conditions. If a fan malfunctions, the transformer must be de-energized, appropriate safety measures implemented, and then the transformer must be accessed for inspection or replacement.

[0003] Especially in power plant generator systems, critical dry-type transformers such as excitation transformers often employ four 220V single-phase AC cooling fans per phase winding in some large excitation transformers. These 220V single-phase AC cooling fans typically require starting capacitors, which are highly sensitive to environmental conditions and have a high probability of burning out. If a fan failure occurs, the excitation transformer faces the risk of high-temperature tripping. During operation, it's common for even a small starting capacitor in the excitation transformer's cooling fan to burn out, requiring the generator to be disconnected and various safety measures implemented before access to the transformer for repair. This maintenance is prohibitively expensive and significantly reduces the stability of the excitation transformer and even the entire power generation system.

[0004] Therefore, there is a need for a maintenance method and corresponding device that allows for the maintenance or replacement of cooling fans without requiring power outages in dry-type transformers or for maintenance personnel to enter the transformer. Utility Model Content

[0005] The purpose of this invention is to provide a removable dry-type transformer cooling device. This device allows for the maintenance and replacement of the dry-type transformer cooling fan even when the transformer is energized, greatly reducing maintenance costs and improving the stability of important dry-type transformers such as the excitation transformer, as well as the entire power generation system.

[0006] This utility model provides a removable dry variable cooling device, including: a main unit and a maintenance mechanism;

[0007] The main unit includes a transformer housing, and the transformer housing has an inspection window;

[0008] The maintenance mechanism is provided in multiple ways;

[0009] The maintenance mechanism includes a cooling fan, a displacement base, a slide rail, and rollers;

[0010] Two slide rails are arranged in parallel. One end of each slide rail is connected to the transformer housing. A transformer winding base is connected to the bottom of each slide rail. The displacement base is placed on the slide rail via rollers. A cooling fan is placed on top of the base.

[0011] Preferably, the maintenance mechanism further includes a pull handle, which is disposed on the displacement base.

[0012] More preferably, the pull handle is fixed to the displacement base by fastening bolts.

[0013] Preferably, the slide rail is connected to the transformer housing by fastening bolts;

[0014] The slide rail is connected to the transformer winding base by fastening bolts.

[0015] Preferably, the pull handle is covered with a cold-shrink insulating sleeve.

[0016] Preferably, the displacement base and the slide rail are grounded via a grounding wire.

[0017] Preferably, the transformer winding base is grounded via a grounding wire.

[0018] Preferably, one end of the inspection window is also provided with a pluggable power connector.

[0019] Further preferably, the pluggable power connector is also provided with a measuring hole.

[0020] Preferably, the inspection window is connected to the transformer casing via a hinge.

[0021] Beneficial effects:

[0022] The technical solution of this utility model involves placing the cooling fan on a displacement base and installing a slide rail below the displacement base. After opening the inspection window, the displacement base can be pulled out, allowing the cooling fan to be removed without entering the transformer casing. This enables maintenance or replacement, avoids operators getting close to live parts, and ensures the safety of operators. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a side view of the maintenance mechanism in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Cooling fan; 2. Inspection window; 3. Slide rail; 4. Pull-out handle; 5. Plug-in power connector; 6. Power cord; 7. Grounding wire; 8. Transformer casing; 9. Displacement base; 10. Transformer winding base; 12. Rollers. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] like Figure 1 and Figure 2As shown, this utility model provides a retractable dry-type transformer cooling device, which includes a main unit and a maintenance mechanism. The main unit includes a transformer housing 8, on which a maintenance window 2 is provided. Multiple maintenance mechanisms are provided, including a cooling fan 1, a displacement base 9, slide rails 3, and rollers 12. Two slide rails 3 are arranged in parallel, one end of which is connected to the transformer housing 8. A transformer winding base 10 is connected below the slide rails 3. The displacement base 9 is placed on the slide rails 3 via the rollers 12, and the cooling fan 1 is placed on top of the base.

[0032] The technical solution of this utility model involves placing the cooling fan 1 on a displacement base 9 and installing a slide rail 3 below the displacement base 9. After opening the inspection window 2, the displacement base 9 can be pulled out, allowing the cooling fan 1 to be removed without entering the transformer casing 8. This enables maintenance or replacement, avoiding the need for operators to approach live parts and ensuring operator safety. This device allows the maintenance and replacement of the dry-type transformer cooling fan 1 to be performed even when the transformer is energized, significantly reducing maintenance costs and improving the stability of important dry-type transformers such as the excitation transformer, and even the entire power generation system.

[0033] The maintenance mechanism also includes a pull-out handle 4, which is mounted on the displacement base 9. The pull-out handle 4 is fixed to the displacement base 9 by fastening bolts. The pull-out handle 4 is covered with a cold-shrink insulating sleeve. Specifically, the pull-out handle 4 is made of 304 stainless steel.

[0034] The slide rail 3 is connected to the transformer housing 8 by fastening bolts, and the slide rail 3 is also connected to the transformer winding base 10 by fastening bolts. Specifically, the displacement base 9, the slide rail 3, and the inspection window 2 are all made of 304 stainless steel.

[0035] The displacement base 9 and slide rail 3 are grounded via grounding wire 7. The transformer winding base 10 is grounded via grounding wire 7. Grounding wire 7 reliably grounds the entire device module, allowing for the maintenance and replacement of the dry-type transformer cooling fan even when the transformer is energized.

[0036] One end of the inspection window 2 is also equipped with a pluggable power connector 5. The power supply for the cooling fan 1 is connected to the transformer air-cooling control circuit via the power cord 6 and the pluggable power connector 5. A measuring hole is also provided at the pluggable power connector 5. Specifically, the lower connector of the pluggable power connector 5 is fixed to the outside of the slide rail 3 near the inspection window 2. Its exterior is made of insulating material, and its interior contains 220V AC positive and negative terminals and a grounding terminal, which are connected to the transformer air-cooling control circuit. The upper connector of the pluggable power connector 5 is not fixed. Its exterior is made of insulating material and can be snapped together with the lower connector. It has two measuring holes. Its interior contains 220V AC positive and negative terminals and a grounding terminal corresponding to the lower interface. When the exterior is snapped together with the lower connector, it is also stably connected to the corresponding terminal of the lower interface.

[0037] The inspection window 2 is connected to the transformer housing 8 via a hinge. Specifically, the inspection window 2 is located directly opposite the slide rail 3 to the transformer housing 8.

[0038] Usage process:

[0039] When cooling fan 1 needs maintenance, even if the transformer is energized, the inspection window 2 can be opened, the plug-in power connector 5 removed, and the base along with cooling fan 1 pulled out of the transformer via the pull handle 4 for maintenance or replacement. Personnel should avoid approaching energized parts. Cooling fan 1 is directly fixed to the displacement base 9 with a clearance fit. If cooling fan 1 needs replacement, simply remove the original cooling fan and install the new one. After maintenance or replacement, place the displacement base 9 along with cooling fan 1 into the slide rail 3 and push it to the bottom. Then insert the plug-in power connector 5 and finally close the inspection window 2.

[0040] A pluggable power connector 5 is installed near the inspection window 2, with two measuring holes. If the fault condition of the cooling fan 1 is unclear, it is not even necessary to remove the cooling fan 1. The internal resistance and insulation can be checked by observing through the inspection window 2 and by checking the two measuring holes of the pluggable power connector 5, thus performing a preliminary inspection of the cooling fan 1.

[0041] The base, along with the pull handle 4 and slide rail 3, is reliably grounded via the grounding wire 7, preventing high-voltage induced current in the dry-type transformer. A cold-shrink insulating sleeve is also fitted over the pull handle 4. This eliminates the risk of electric shock for maintenance personnel when installing or removing the cooling fan 1, ensuring their safety.

[0042] In this embodiment, the entire maintenance process of the dry-type transformer cooling fan 1 avoids maintenance personnel coming into contact with live parts, even when the dry-type transformer is energized. Furthermore, the entire maintenance process is more efficient than existing technologies and avoids the risk of the dry-type transformer tripping due to high temperature.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A removable dry variable cooling device, characterized in that, include: Main unit and maintenance mechanism; The main unit includes a transformer housing, and the transformer housing has an inspection window; The maintenance mechanism is provided in multiple ways; The maintenance mechanism includes a cooling fan, a displacement base, a slide rail, and rollers; Two slide rails are arranged in parallel. One end of each slide rail is connected to the transformer housing. A transformer winding base is connected to the bottom of each slide rail. The displacement base is placed on the slide rail via rollers. A cooling fan is placed on top of the base.

2. The extractable dry variable cooling device according to claim 1, characterized in that, The maintenance mechanism also includes a pull handle, which is mounted on the displacement base.

3. The extractable dry variable cooling device according to claim 2, characterized in that, The pull handle is fixed to the displacement base by fastening bolts.

4. The extractable dry variable cooling device according to claim 1, characterized in that, The slide rail is connected to the transformer housing by fastening bolts; The slide rail is connected to the transformer winding base by fastening bolts.

5. The extractable dry variable cooling device according to claim 2, characterized in that, The pull handle is covered with a cold-shrink insulating sleeve.

6. The extractable dry variable cooling device according to claim 1, characterized in that, The displacement base and the slide rail are grounded via a grounding wire.

7. The extractable dry variable cooling device according to claim 1, characterized in that, The transformer winding base is grounded via a grounding wire.

8. The extractable dry variable cooling device according to claim 1, characterized in that, One end of the inspection window is also equipped with a pluggable power connector.

9. The extractable dry variable cooling device according to claim 8, characterized in that, The pluggable power connector is also equipped with a measuring hole.

10. The extractable dry variable cooling device according to claim 1, characterized in that, The inspection window is connected to the transformer casing via a hinge.

Images