Dry-type transformer

Abstract

The utility model relates to the field of cooling and ventilation of transformers, in particular to a dry-type transformer. The dry-type transformer is used for solving the problems that a refrigeration fan of an existing dry-type transformer is prone to being damaged, when the refrigeration fan is damaged, the refrigeration fan needs to stop running and be overhauled, and normal running of the dry-type transformer is affected. The dry-type transformer comprises a control system, a bottom foot, a lower clamping piece and a three-phase winding, the lower clamping piece and the three-phase winding are installed on the bottom foot, a ventilation air channel is formed between a high-voltage winding and a low-voltage winding of each phase winding, a first refrigeration fan unit is arranged on the lower clamping piece, an air opening of a refrigeration fan of the first refrigeration fan unit faces the ventilation air channel, and a second refrigeration fan unit is further installed on the bottom foot. The first refrigerating fan unit and the second refrigerating fan unit are both connected with the control system, and the refrigerating fan units serve as backups for each other, so that when one refrigerating fan unit breaks down, the other refrigerating fan unit can work under the control of the control system. And continuous cooling of the transformer is ensured.

Description

Technical Field

[0001] This utility model relates to the field of transformer cooling and ventilation, and specifically to a dry-type transformer. Background Technology

[0002] Currently, dry-type transformers are widely used in power systems due to their advantages such as environmental friendliness, safety, and ease of maintenance. However, with the continuous improvement of people's living standards and the gradual increase in electricity demand, dry-type transformers often operate under overload conditions. Under high-load operating conditions, traditional dry-type transformers may face the problem of insufficient heat dissipation. Therefore, heat dissipation of dry-type transformers is particularly important.

[0003] Chinese utility model patent CN202977084U discloses a dry-type transformer. This transformer includes a base, on which an iron core is mounted. From the inside out, the iron core has low-voltage windings and high-voltage windings, forming a ventilation channel between them. A cooling fan is also mounted on the base. In existing technology, the base typically consists of a lower clamp and feet. The iron core and cooling fan are mounted on the lower clamp. When the dry-type transformer reaches a high temperature, the control system activates the cooling fan, which directs airflow through the ventilation channel to dissipate heat and achieve cooling. However, existing dry-type transformers are often under overload, causing frequent starts of the cooling fan, leading to frequent fan malfunctions. Furthermore, the humidity and dust accumulation in the surrounding environment also increase the likelihood of cooling fan failure. Once the cooling fan malfunctions, the transformer must be immediately shut down for cooling system maintenance, disrupting the transformer's normal operation. Utility Model Content

[0004] The purpose of this utility model is to provide a dry-type transformer to solve the problem that existing dry-type transformers need to be stopped and repaired when the refrigeration fan is damaged, which affects the normal operation of the dry-type transformer.

[0005] To solve the above-mentioned technical problems, the present invention provides a dry-type transformer with the following technical solution:

[0006] A dry-type transformer includes a control system, a base, and a transformer core mounted on the base. The transformer core includes a lower clamp and three-phase windings. A ventilation duct is formed between the high-voltage and low-voltage windings of each phase winding. A first cooling fan unit is installed on the lower clamp with its air outlet facing the ventilation duct. A second cooling fan unit is also installed on the base with its air outlet also facing the ventilation duct. Both the first and second cooling fan units are connected to the control system and serve as backups for each other so that if one cooling fan unit fails, the other cooling fan unit can operate under the control of the control system.

[0007] Furthermore, the three-phase windings are arranged in a row, and a second cooling fan unit is installed on both sides of the row of three-phase windings, corresponding to each phase winding.

[0008] Furthermore, the lower clamp is also equipped with an interphase cooling fan unit that can cool the space between two adjacent phase windings.

[0009] Furthermore, the refrigeration fan of the phase-to-phase refrigeration fan unit is a centrifugal fan.

[0010] Furthermore, the cooling fan of the first cooling fan unit is a centrifugal fan, and its air outlet faces the ventilation duct.

[0011] Furthermore, a mounting bracket is installed on the base, extending along the arrangement direction of the three-phase windings. The mounting bracket is fixedly connected to the two bases near both ends, and the second refrigeration fan unit is installed on the mounting bracket.

[0012] Furthermore, the refrigeration fan of the second refrigeration fan unit is a crossflow fan.

[0013] Furthermore, the crossflow fan is configured in a one-to-one correspondence with each phase winding.

[0014] Furthermore, it also includes an alarm device connected to the control system to issue an alarm signal when the refrigeration fan unit malfunctions.

[0015] This utility model proposes an improved technical solution. By setting a second cooling fan unit on the base, both the first and second cooling fan units are connected to the control system and serve as backups for each other. When one cooling fan unit fails, the other cooling fan unit can take over the cooling work under the control of the control system to blow air into the ventilation duct, thereby ensuring that the cooling of the transformer is uninterrupted. Attached Figure Description

[0016] Figure 1 This is a front view of a dry-type transformer according to the present invention;

[0017] Figure 2 for Figure 1 The left view;

[0018] Figure 3 for Figure 1 Top view.

[0019] In the diagram: 1. High-voltage winding; 2. Low-voltage winding; 3. Lower clamp; 4. First refrigeration fan unit; 5. Second refrigeration fan unit; 6. Base; 7. Intelligent temperature control monitoring; 8. Interphase refrigeration fan unit; 9. Mounting bracket. Detailed Implementation

[0020] This utility model proposes an improved technical solution to address the problems existing in the above-mentioned technical solutions. The core concept of this utility model is: to install a second cooling fan unit on the base, and both the first and second cooling fan units are connected to the control system and the cooling fan units serve as backups for each other. In the event of a failure of one cooling fan unit, the other cooling fan unit can take over the cooling work under the control of the control system to blow air into the ventilation duct, ensuring that the cooling of the transformer is uninterrupted.

[0021] In view of the above-mentioned inventive concept, the present invention provides a dry-type transformer including a control system, such as... Figure 1 The diagram shows the base 6 and the transformer core mounted on the base 6. The transformer core includes a lower clamp 3, and a three-phase winding is mounted on the upper clamp 3. A ventilation channel is formed between the high-voltage and low-voltage windings of each phase winding. The lower clamp 3 is provided with... Figure 2 The first cooling fan unit 4 is shown, and its air outlet faces the ventilation duct. This ensures that the cooling fan dissipates heat from the ventilation duct when blowing air, thereby cooling the dry-type transformer. A second cooling fan unit 5 is also mounted on the base 6, with its air outlet also facing the ventilation duct. Both the first and second cooling fan units 4 and 5 are connected to the control system, and the cooling fan units serve as backups for each other. The control system includes, as shown... Figure 1 The temperature control intelligent monitoring 7 shown has a switching mechanism for switching the cooling fan units. In this way, when one of the cooling fan units fails, the other cooling fan unit can immediately take over the operation under the switching mechanism of the temperature control intelligent monitoring 7 to blow air into the ventilation duct, ensuring uninterrupted cooling of the dry-type transformer and enabling the dry-type transformer to operate continuously and stably.

[0022] In this embodiment, the three-phase windings are arranged in a row, and a second cooling fan unit 5 is provided on both sides of the row of three-phase windings, corresponding to each phase winding. The second cooling fan units 5 located on both sides of the three-phase windings can uniformly dissipate heat from the ventilation ducts and can also better replace the cooling effect of the first cooling fan unit. Of course, in other embodiments, the cooling fan of the second cooling fan unit may only be placed on one side of the three-phase windings.

[0023] In this embodiment, the lower clamp 3 is also provided with such as Figure 3 The diagram shows an interphase cooling fan unit 8 that can cool the space between adjacent phase windings. The first cooling fan unit 4 and the second cooling fan unit 5 can only cool the ventilation duct between the high-voltage winding 1 and the low-voltage winding 2, and the space between the two phase windings cannot be adequately cooled. However, the interphase cooling fan unit 8 can cool the windings between phases, which greatly improves the heat dissipation effect of the dry-type transformer.

[0024] In this embodiment, the cooling fan of the interphase cooling fan unit 8 is a centrifugal fan. Centrifugal fans are small in size and can provide a stable and strong airflow, which helps to quickly remove heat. In addition, in other embodiments, the cooling fan of the interphase cooling fan unit 8 can also be an axial flow fan or a crossflow fan, as long as the cooling fan can blow air to cool the space between the two phase windings.

[0025] In this embodiment, the cooling fan of the first cooling fan unit 4 is a centrifugal fan, with its outlet facing the ventilation duct. Centrifugal fans are small in size and can provide a stable and strong airflow, helping to quickly remove heat. Furthermore, in other embodiments, the cooling fan of the first cooling fan unit can also be an axial flow fan or a crossflow fan, as long as the cooling fan can effectively cool the ventilation duct.

[0026] In this embodiment, a mounting bracket 9 is mounted on the base 6. The mounting bracket 9 extends along the arrangement direction of the three-phase windings, and the positions of the mounting bracket 9 near both ends are fixedly connected to the two bases 6 respectively. The second refrigeration fan unit 5 is mounted on the mounting bracket. The second refrigeration fan unit 5 can be first installed on the mounting bracket 9, and the two can be installed as a modular whole. This makes the installation of the second refrigeration fan unit 5 convenient.

[0027] In this embodiment, the cooling fan of the second cooling fan unit 5 is a crossflow fan. The airflow direction of a crossflow fan is horizontal inlet and horizontal outlet; therefore, the outlet of the crossflow fan needs to be adjusted so that it faces the ventilation duct. Furthermore, the crossflow fan is mounted on a base, i.e., located beside the winding. In use, the crossflow fan can not only cool the ventilation duct but also blow air onto the outside of the high-voltage winding. Of course, in other embodiments, the cooling fan of the second cooling fan unit can also be a centrifugal fan.

[0028] In this embodiment, the crossflow fan is configured in a one-to-one correspondence with each phase winding. For example... Figure 1 As shown, the dry-type transformer has three-phase windings. Crossflow fans are positioned on both sides of each phase winding, corresponding one-to-one with each phase winding, to dissipate heat from the windings. This ensures the cooling effect of the crossflow fans on the windings. Furthermore, in other embodiments, only one large crossflow fan can be installed on one side of the three-phase windings, simultaneously cooling the ventilation ducts on the three-phase windings.

[0029] In this embodiment, the dry-type transformer also includes an alarm device connected to the control system to issue an alarm signal when the refrigeration fan unit malfunctions. The alarm signal issued by the alarm device helps staff to promptly detect refrigeration fan malfunctions and take repair measures as soon as possible to avoid more serious equipment failures caused by damage to the refrigeration fan.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A dry-type transformer, comprising a control system, a base, and a transformer core mounted on the base, the transformer core comprising a lower clamp and three-phase windings, wherein a ventilation duct is formed between the high-voltage and low-voltage windings of each phase winding, and a first cooling fan unit is disposed on the lower clamp with the cooling fan outlet of the first cooling fan unit facing the ventilation duct, characterized in that: A second refrigeration fan unit is also installed on the base. The air outlet of the second refrigeration fan unit also faces the ventilation duct. Both the first and second refrigeration fan units are connected to the control system and the refrigeration fan units serve as backups for each other so that when one set of refrigeration fan units fails, the other set of refrigeration fan units can work under the control of the control system.

2. The dry-type transformer according to claim 1, characterized in that: The three-phase windings are arranged in a row, and a second cooling fan is installed on both sides of the row of three-phase windings, corresponding to each phase winding.

3. The dry-type transformer according to claim 1 or 2, characterized in that: The lower clamp is also equipped with an interphase cooling fan unit that can cool the space between two adjacent phase windings.

4. The dry-type transformer according to claim 3, characterized in that: The refrigeration fans in the phase-to-phase refrigeration fan unit are centrifugal fans.

5. The dry-type transformer according to claim 1 or 2, characterized in that: The first refrigeration fan unit has a centrifugal fan with its air outlet facing the ventilation duct.

6. The dry-type transformer according to claim 1 or 2, characterized in that: The base is equipped with a mounting bracket that extends along the arrangement direction of the three-phase winding. The mounting bracket is fixedly connected to the two bases near both ends. The second refrigeration fan unit is installed on the mounting bracket.

7. The dry-type transformer according to claim 6, characterized in that: The refrigeration fan of the second refrigeration fan unit is a crossflow fan.

8. The dry-type transformer according to claim 7, characterized in that: The crossflow fan is configured in a one-to-one correspondence with each phase winding.

9. The dry-type transformer according to claim 1 or 2, characterized in that: It also includes an alarm device that is connected to the control system to issue an alarm signal when one refrigeration unit fails and another refrigeration unit is started.

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