A transformer oil pump standby structure

Abstract

The application provides a transformer oil pump standby structure, which comprises connecting pipes connected between a first oil outlet of a transformer and an oil inlet of a first cooler and between the first oil outlet of the transformer and an oil inlet of a second cooler; a main oil pump is installed on the connecting pipes, and the oil inlet end and the oil outlet end of the main oil pump are both provided with control valves; a first standby pipe and a second standby pipe are connected between the two connecting pipes, a third standby pipe is connected between the first standby pipe and the second standby pipe, the third standby pipe is in communication with the first standby pipe and the second standby pipe, a standby oil pump is installed on the third standby pipe, and control valve groups are arranged on the first standby pipe and the second standby pipe; the control valves and the control valve groups are electrically connected with a controller through channel wires, a flow sensor is electrically connected to the controller, and the flow sensor is arranged at the oil outlet of the main oil pump.

Description

Technical Field

[0001] This invention belongs to the technical field of transformer auxiliary equipment, specifically to a standby structure for a transformer oil pump. Background Technology

[0002] With the continuous increase in transformer capacity and the growing number of old substation expansion and renovation projects, traditional radiators can no longer meet the requirements of users for the site. As a highly efficient heat dissipation device, coolers are being used more frequently on transformers.

[0003] However, during the expansion and renovation of the old substation, the cooler is connected to the transformer via pipelines, and an oil pump is installed on the pipelines to deliver the cooling medium to the cooler. However, due to space limitations, no backup system is installed at the existing oil pump location. When the oil pump fails, the cooler will be used entirely, resulting in the cooler losing its cooling capacity. This causes the main equipment in the transformer to overheat, making it impossible to supply power normally. In severe cases, it can cause the transformer to burn out and lose power supply. Summary of the Invention

[0004] To address the problem that existing coolers are connected to the transformer via pipelines without a backup line, and that the cooler will be in full use when the oil pump fails, potentially causing damage to major equipment in the transformer, this invention provides a backup structure for the transformer oil pump.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention proposes a standby structure for a transformer oil pump, including a connecting pipe connecting the first oil outlet of the transformer and the oil inlet of the first cooler, and the second oil outlet of the transformer and the oil inlet of the second cooler. A main oil pump is installed on the connecting pipe, and control valves are provided at both the oil inlet and oil outlet of the main oil pump. A first spare pipe and a second spare pipe are connected between the two connecting pipes. The first spare pipe is connected to the connecting pipe at the positions between the first oil outlet of the transformer and the control valve and between the second oil outlet of the transformer and the control valve, respectively. The second spare pipe is connected to the connecting pipe at the positions between the control valve and the oil inlet of the second cooler and between the control valve and the oil inlet of the first cooler, respectively. A third backup pipe is connected between the first backup pipe and the second backup pipe. The third backup pipe is connected to both the first backup pipe and the second backup pipe. A backup oil pump is installed on the third backup pipe. Control valve groups are installed on both the first backup pipe and the second backup pipe. The control valve and the control valve group are electrically connected to the controller via wires. A flow sensor is electrically connected to the controller and is located at the oil outlet of the main oil pump.

[0006] Preferably, the main oil pump includes a first main oil pump and a second main oil pump, wherein the first main oil pump is installed on the connecting pipe connecting the first oil outlet of the transformer and the oil inlet of the first cooler; The second main oil pump is installed on the connecting pipe between the second oil outlet of the transformer and the oil inlet of the second cooler.

[0007] Preferably, the control valve includes a first butterfly valve, a fourth butterfly valve, a fifth butterfly valve, and a seventh butterfly valve; The first butterfly valve is located at the oil inlet end of the first main oil pump, and the fifth butterfly valve is located at the oil outlet end of the first main oil pump. The fourth butterfly valve is located at the oil inlet end of the second main oil pump, and the seventh butterfly valve is located at the oil outlet end of the second main oil pump.

[0008] Preferably, the first butterfly valve, the fourth butterfly valve, the fifth butterfly valve, and the seventh butterfly valve are all DN150 type butterfly valves.

[0009] Preferably, the control valve group includes a first valve group disposed on a first spare pipe and a second valve group disposed on a second spare pipe; The first valve group includes a second butterfly valve and a third butterfly valve. The second butterfly valve is disposed on one side of the first spare pipe at the connection position between the first spare pipe and the third spare pipe, and the third butterfly valve is disposed on the other side of the first spare pipe at the connection position between the first spare pipe and the third spare pipe. The second valve assembly includes a sixth butterfly valve and an eighth butterfly valve. The sixth butterfly valve is located on one side of the second spare pipe at the connection point between the second spare pipe and the third spare pipe, and the eighth butterfly valve is located on the other side of the second spare pipe at the connection point between the second spare pipe and the third spare pipe.

[0010] Preferably, the second butterfly valve, the third butterfly valve, the sixth butterfly valve, and the eighth butterfly valve are all DN150 type butterfly valves.

[0011] Preferably, a first ball valve is provided on the first oil outlet of the transformer, a second ball valve is provided on the second oil outlet of the transformer, a fourth ball valve is provided on the oil inlet of the second cooler, and a third ball valve is provided on the oil inlet of the first cooler.

[0012] Preferably, the first ball valve, the second ball valve, the third ball valve, and the fourth ball valve are all DN125 ball valves.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a backup structure for a transformer oil pump. In this backup structure, a main oil pump and inlet / outlet control valves are installed on the connecting pipe between the transformer's first oil outlet and the two coolers. This, along with a first backup pipe, a second backup pipe between the two connecting pipes, and a third backup pipe with a backup oil pump between them, constructs a complete main and backup oil supply system. This avoids the situation where the coolers fail due to a lack of backup routes and a main oil pump malfunction. Specifically, when the main oil pump fails, the controller obtains the main oil pump's operating status through a flow sensor, and then controls the main oil pump control valve to close and the control valve group on the backup pipe to open via wires. The backup oil pump quickly intervenes to continuously supply oil to the two coolers, preventing damage to the transformer's main equipment due to cooling interruption, improving equipment operational continuity, extending transformer lifespan, reducing maintenance risks caused by cooling failure, and enhancing equipment operational stability. Furthermore, this backup system uses a control valve group to enable the backup oil pump to form an independent cooling medium delivery channel after one of the main oil pumps fails, and the delivery process does not affect the transmission of cooling medium in the other main oil pump. The structure is simple and the operation is convenient.

[0014] Furthermore, this backup system uses controllers to link with green and red warning lights respectively, providing intuitive feedback on the operating status of the first and second main oil pumps. This reduces the difficulty of inspection for maintenance personnel and enables the visualization of fault warnings and status of the first and second main oil pumps, providing more comprehensive protection for the continuous and stable operation of the transformer cooling system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system connection of a transformer oil pump standby structure proposed in this invention; Figure 2 This is a schematic diagram of the pipeline connection for a transformer oil pump standby structure proposed in this invention; Figure 3 This is a schematic diagram of the cooling medium delivery in the standby structure of a transformer oil pump proposed in this invention when the first main oil pump fails. Figure 4 This is a schematic diagram of the cooling medium delivery in the standby structure of a transformer oil pump proposed in this invention when the second main oil pump fails. In the attached diagram: 1. First butterfly valve; 2. Second butterfly valve; 3. Third butterfly valve; 4. Fourth butterfly valve; 5. Fifth butterfly valve; 6. Sixth butterfly valve; 7. Seventh butterfly valve; 8. Eighth butterfly valve; 9. Connecting pipe; 10. First main oil pump; 11. Standby oil pump; 12. Second main oil pump; 13. First ball valve; 14. Second ball valve; 15. Third ball valve; 16. Fourth ball valve; 17. First cooler; 18. Second cooler. Detailed Implementation

[0016] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0017] In the description of this invention, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] 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 that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] This invention proposes a standby structure for a transformer oil pump, such as... Figures 1-4 As shown, it includes a connecting pipe 9 connecting the first oil outlet of the transformer and the oil inlet of the first cooler 17, and the second oil outlet of the transformer and the oil inlet of the second cooler 18; a main oil pump is installed on the connecting pipe 9, and control valves are provided at both the oil inlet and outlet ends of the main oil pump; a first spare pipe and a second spare pipe are connected between the two connecting pipes 9, the first spare pipe being connected to the connecting pipe 9 at the positions between the first oil outlet of the transformer and the control valve and the second oil outlet of the transformer and the control valve, respectively, and the second spare pipe being connected to the connecting pipe 9 at the positions between the control valve and the second cooler 18, respectively. The main oil pump and the control valve are connected between the oil inlet of the transformer and the oil inlet of the first cooler 17; a third backup pipe is connected between the first backup pipe and the second backup pipe, and the third backup pipe is connected to the first backup pipe and the second backup pipe respectively. A backup oil pump 11 is installed on the third backup pipe, and control valve groups are installed on both the first backup pipe and the second backup pipe. By setting the main oil pump and the oil inlet and outlet control valve on the connecting pipe 9 between the first oil outlet of the transformer and the two coolers, and with the first backup pipe, the second backup pipe and the third backup pipe with backup oil pump 11 between the two connecting pipes, a complete main and backup oil supply system is constructed.

[0023] The control valve and control valve group are electrically connected to the controller via wires. A flow sensor is electrically connected to the controller and is located at the oil outlet of the main oil pump. The flow sensor monitors the oil supply status of the main oil pump in real time. In this backup structure, the main oil pump fault can be identified in advance or immediately by abnormal flow, such as sudden drop, interruption, or excessive fluctuation, avoiding the risk of cooling interruption caused by delayed fault identification. When the flow sensor detects an abnormal flow and transmits an electrical signal to the controller, the controller can quickly close the inlet and outlet control valves of the faulty main oil pump via wires. At the same time, it opens the control valve groups on the first and second backup pipes and the backup oil pump 11 on the third backup pipe, realizing automatic and rapid switching between the main and backup oil circuits. This allows the first cooler 17 and the second cooler 18 to continuously cool the transformer, preventing the main transformer equipment from overheating and being damaged due to cooling failure.

[0024] In this embodiment, as Figures 1-4 As shown, the main oil pump includes a first main oil pump 10 and a second main oil pump 12. The first main oil pump 10 is installed on the connecting pipe 9 connecting the first oil outlet of the transformer and the oil inlet of the first cooler 17; the second main oil pump 12 is installed on the connecting pipe 9 connecting the second oil outlet of the transformer and the oil inlet of the second cooler 18.

[0025] In this embodiment, as Figures 1-4 As shown, the control valves include a first butterfly valve 1, a fourth butterfly valve 4, a fifth butterfly valve 5, and a seventh butterfly valve 7. The first butterfly valve 1 is located at the inlet of the first main oil pump 10, and the fifth butterfly valve 5 is located at the outlet of the first main oil pump 10. The fourth butterfly valve 4 is located at the inlet of the second main oil pump 12, and the seventh butterfly valve 7 is located at the outlet of the second main oil pump 12. In this embodiment, the first butterfly valve 1, the fourth butterfly valve 4, the fifth butterfly valve 5, and the seventh butterfly valve 7 are all DN150 type butterfly valves.

[0026] In this embodiment, as Figures 1-4As shown, the control valve group includes a first valve group installed on the first backup pipe and a second valve group installed on the second backup pipe. The first valve group includes a second butterfly valve 2 and a third butterfly valve 3. The second butterfly valve 2 is installed on one side of the first backup pipe at the connection position between the first backup pipe and the third backup pipe, and the third butterfly valve 3 is installed on the other side of the first backup pipe at the connection position between the first backup pipe and the third backup pipe. The second valve group includes a sixth butterfly valve 6 and an eighth butterfly valve 8. The sixth butterfly valve 6 is installed on one side of the second backup pipe at the connection position between the second backup pipe and the third backup pipe, and the eighth butterfly valve 8 is installed on the other side of the second backup pipe at the connection position between the second backup pipe and the third backup pipe. Through the cooperation of the first valve group and the second valve group, the controller achieves precise oil circuit switching and optimizes the reliability of the main and backup systems. When a single main oil pump fails, the controller, based on the flow data transmitted by the flow sensor, then precisely controls the control valve of the failed main oil pump to close via a wire, while simultaneously opening the butterfly valve on the corresponding backup pipe. This allows the backup oil pump 11 to supply oil to the cooler on the failed side through the third backup pipe and the corresponding backup pipe, while the other main oil pump operates normally, achieving precise backup replenishment in a single failure scenario. In this embodiment, the second butterfly valve 2, the third butterfly valve 3, the sixth butterfly valve 6, and the eighth butterfly valve 8 are all DN150 butterfly valves.

[0027] In this embodiment, as Figure 1 As shown, a first ball valve 13 is installed at the first oil outlet of the transformer, a second ball valve 14 is installed at the second oil outlet of the transformer, a fourth ball valve 16 is installed at the oil inlet of the second cooler 18, and a third ball valve 15 is installed at the oil inlet of the first cooler 17. In this embodiment, the first ball valve 13, the second ball valve 14, the third ball valve 15, and the fourth ball valve 16 are all DN125 ball valves.

[0028] In this embodiment, the controller is electrically connected to a fault display, which includes a green warning light and a red warning light connected to the controller. The green and red warning lights are linked to the controller to form a clear feedback mechanism for the operating status of the first main oil pump 10 and the second main oil pump 12. When either the first main oil pump 10 or the second main oil pump 12 fails and the standby oil pump 11 starts, the red warning light illuminates. When both the first main oil pump 10 and the second main oil pump 12 are operating normally, the green warning light illuminates, alerting maintenance personnel to the fault in either the first or second main oil pump 12. This allows maintenance personnel to quickly detect the critical status of main oil pump failure and standby system intervention, preventing the situation where the failure of the first or second main oil pump 10 or the second main oil pump 12 is hidden, the standby oil pump 11 operates undetected for a long time, and the secondary risks caused by the long-term single-load operation of the standby oil pump 11. In this embodiment, the controller is a PLC.

[0029] The specific usage process of this backup system is as follows: the flow signals at the oil outlets of the first main oil pump 10 and the second main oil pump 12 are obtained through the flow sensor, and the flow signals are compared with the abnormal signals stored in the controller to determine the operating status of the first main oil pump 10 and the second main oil pump 12.

[0030] When it is confirmed that the first main oil pump 10 and the second main oil pump 12 are operating normally, the green warning light illuminates, the first butterfly valve 1, the fourth butterfly valve 4, the fifth butterfly valve 5, and the seventh butterfly valve 7 open, and the second butterfly valve 2, the third butterfly valve 3, the sixth butterfly valve 6, and the eighth butterfly valve 8 close. Figure 2 As shown, the cooling medium in the transformer is transported to the first cooler 17 and the second cooler 18 through the connecting pipe 9 for cooling.

[0031] When a fault is detected in the first main oil pump 10, the red warning light illuminates, the first butterfly valve 1 and the fifth butterfly valve 5 close, the fourth butterfly valve 4 and the seventh butterfly valve 7 open normally, the second butterfly valve 2 and the sixth butterfly valve 6 open, and the third butterfly valve 3 and the eighth butterfly valve 8 remain closed. Figure 3 As shown, part of the cooling medium in the transformer is transported to the second cooler 18 through the connecting pipe 9 for cooling, and the other part flows through the first standby pipe through the standby oil pump 11, enters the second standby pipe, and then enters the first cooler 17 for cooling.

[0032] When a malfunction is confirmed in the second main oil pump 12, the red warning light illuminates. The first butterfly valve 1 and the fifth butterfly valve 5 open normally, the fourth butterfly valve 4 and the seventh butterfly valve 7 close, the second butterfly valve 2 and the sixth butterfly valve 6 remain closed, and the third butterfly valve 3 and the eighth butterfly valve 8 open. Figure 4 As shown, part of the cooling medium in the transformer is transported to the first cooler 17 through the connecting pipe 9 for cooling, and the other part flows through the first standby pipe through the standby oil pump 11 and enters the second standby pipe, and then enters the second cooler 18 for cooling.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A standby structure for a transformer oil pump, characterized in that, Including the connecting pipe (9) between the first oil outlet of the transformer and the oil inlet of the first cooler (17), and between the second oil outlet of the transformer and the oil inlet of the second cooler (18); A main oil pump is installed on the connecting pipe (9), and control valves are provided at both the oil inlet and the oil outlet of the main oil pump. A first spare pipe and a second spare pipe are connected between the two connecting pipes (9). The first spare pipe and the connecting pipe (9) are connected at the positions between the first oil outlet of the transformer and the control valve and between the second oil outlet of the transformer and the control valve, respectively. The second spare pipe and the connecting pipe (9) are connected at the positions between the control valve and the oil inlet of the second cooler (18) and between the control valve and the oil inlet of the first cooler (17), respectively. A third backup pipe is connected between the first backup pipe and the second backup pipe. The third backup pipe is connected to the first backup pipe and the second backup pipe respectively. A backup oil pump (11) is installed on the third backup pipe. A control valve group is provided on both the first backup pipe and the second backup pipe. The control valve and the control valve group are electrically connected to the controller via wires. A flow sensor is electrically connected to the controller and is located at the oil outlet of the main oil pump. The main oil pump includes a first main oil pump (10) and a second main oil pump (12). The first main oil pump (10) is installed on the connecting pipe (9) that connects the first oil outlet of the transformer and the oil inlet of the first cooler (17). The second main oil pump (12) is installed on the connecting pipe (9) that connects the second oil outlet of the transformer and the oil inlet of the second cooler (18); The control valves include a first butterfly valve (1), a fourth butterfly valve (4), a fifth butterfly valve (5), and a seventh butterfly valve (7). The first butterfly valve (1) is located at the oil inlet end of the first main oil pump (10), and the fifth butterfly valve (5) is located at the oil outlet end of the first main oil pump (10). The fourth butterfly valve (4) is located at the oil inlet end of the second main oil pump (12), and the seventh butterfly valve (7) is located at the oil outlet end of the second main oil pump (12). The control valve group includes a first valve group disposed on a first spare pipe and a second valve group disposed on a second spare pipe; The first valve group includes a second butterfly valve (2) and a third butterfly valve (3). The second butterfly valve (2) is located on one side of the first spare pipe at the connection position between the first spare pipe and the third spare pipe, and the third butterfly valve (3) is located on the other side of the first spare pipe at the connection position between the first spare pipe and the third spare pipe. The second valve group includes a sixth butterfly valve (6) and an eighth butterfly valve (8). The sixth butterfly valve (6) is located on one side of the second spare pipe at the connection position between the second spare pipe and the third spare pipe, and the eighth butterfly valve (8) is located on the other side of the second spare pipe at the connection position between the second spare pipe and the third spare pipe.

2. The transformer oil pump standby structure according to claim 1, characterized in that, The first butterfly valve (1), the fourth butterfly valve (4), the fifth butterfly valve (5), and the seventh butterfly valve (7) are all DN150 type butterfly valves.

3. The transformer oil pump standby structure according to claim 1, characterized in that, The second butterfly valve (2), the third butterfly valve (3), the sixth butterfly valve (6) and the eighth butterfly valve (8) are all DN150 type butterfly valves.

4. The transformer oil pump standby structure according to claim 1, characterized in that, A first ball valve (13) is provided on the first oil outlet of the transformer, a second ball valve (14) is provided on the second oil outlet of the transformer, a fourth ball valve (16) is provided on the oil inlet of the second cooler (18), and a third ball valve (15) is provided on the oil inlet of the first cooler (17).

5. A transformer oil pump standby structure according to claim 4, characterized in that, The first ball valve (13), the second ball valve (14), the third ball valve (15) and the fourth ball valve (16) are all DN125 ball valves.

6. The transformer oil pump standby structure according to claim 1, characterized in that, The controller is connected to a fault display when powered on.

7. A transformer oil pump standby structure according to claim 6, characterized in that, The fault display includes a green warning light and a red warning light, which are respectively connected to the controller.

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