New energy oil-immersed transformer

Abstract

The invention discloses a new energy oil-immersed transformer which comprises a transformer body. The heat conducting plate is arranged on one side of the transformer body; the heat dissipation plates are arranged on the surface of the heat conduction plate at intervals, the heat dissipation plates are hollow, heat dissipation coil pipes are arranged in the heat dissipation plates respectively, water inlets and water outlets of the heat dissipation coil pipes penetrate out of one sides of the heat dissipation plates to be communicated with a water inlet pipe and a water outlet pipe respectively, and a water pump is arranged on the water inlet pipe; the controller is connected with the water pump and used for adjusting the power of the water pump according to the monitored temperature of the area where the heat dissipation plate is located. According to the invention, precise heat dissipation can be realized, and heat dissipation energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field related to transformers, and more specifically, to a new energy oil-immersed transformer. Background Art

[0002] New energy oil-immersed transformers (transformers for hydropower, wind power, and solar power generation systems) use transformer oil as an insulating and heat dissipation medium in the oil tank, and the iron core and windings are immersed in the transformer oil. At present, the existing technology generally sets a heat sink outside the oil tank, and then combines air cooling, water cooling and other methods to improve the heat dissipation effect. However, these existing technologies usually dissipate heat blindly, do not consider the temperature differences in different areas, cannot achieve accurate heat dissipation, and have high heat dissipation energy consumption. Therefore, it is necessary to design a technical solution that can overcome the above defects. Summary of the invention

[0003] An object of the present invention is to provide a new energy oil-immersed transformer that can achieve precise heat dissipation and reduce heat dissipation energy consumption.

[0004] In order to achieve these purposes and other advantages of the present invention, according to one aspect of the present invention, the present invention provides a new energy oil-immersed transformer, including: a transformer body; a heat conduction plate, which is arranged on one side of the transformer body; a plurality of heat sinks, which are arranged at intervals on the surface of the heat conduction plate, the heat sinks are hollow inside, and heat sinks are respectively arranged inside the heat sinks, and the water inlet and water outlet of the heat sink pass through one side of the heat sink and are respectively connected to a water inlet pipe and a water outlet pipe, and a water pump is arranged on the water inlet pipe; a controller, which is connected to the water pump and is used to adjust the power of the water pump according to the monitored temperature of the area where the heat sink is located.

[0005] Furthermore, it also includes: multiple temperature sensors, multiple temperature sensors are distributed on the heat conducting plate, and the heat conducting plate is divided into multiple monitoring areas, multiple heat dissipation plates are respectively located in the multiple monitoring areas, and the controller determines the monitoring temperature of each monitoring area according to the temperature value of the temperature sensor corresponding to each monitoring area.

[0006] Furthermore, the plurality of temperature sensors form a rectangular array on the heat conducting plate, and each heat dissipation plate is surrounded by four temperature sensors.

[0007] Furthermore, the controller constructs a variation curve of the monitored temperature in a predetermined time period, constructs a power variation curve according to the variation curve and a preset target temperature, and controls the power of the water pump according to the power variation curve.

[0008] Furthermore, the controller obtains the monitored temperature, transformer operating time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure in several historical time intervals of each of the monitored areas, and inputs them into a prediction model, outputs the predicted monitored temperature in a future time interval, and constructs the change curve of a predetermined time period based on the predicted monitored temperature; the prediction model uses the historical data of the monitored temperature, transformer operating time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure, inputs them into a BP neural network, and is trained.

[0009] Furthermore, the controller also obtains the water temperature value in the water inlet pipe, and compares it with the water temperature reference value to obtain the water temperature difference, and corrects the power change curve according to the water temperature difference.

[0010] Furthermore, the heat dissipation coil is obtained by bending or winding a metal tube multiple times.

[0011] Furthermore, the water inlet pipe and the water outlet pipe are connected to a water tank.

[0012] The present invention has at least the following beneficial effects: The present invention comprises a transformer body, a heat conducting plate, a plurality of heat sinks and a controller. The plurality of heat sinks are arranged at intervals on the surface of the heat conducting plate. Heat sinks are respectively provided inside the heat sinks. A water inlet and a water outlet of the heat sink pass through one side of the heat sink and are respectively connected with a water inlet pipe and a water outlet pipe. A water pump is provided on the water inlet pipe. The controller is used for adjusting the power of the water pump according to the monitored temperature of the heat conducting plate and the ambient temperature. The present invention can dissipate heat for each heat sink individually through the heat sink and adjust the power of the water pump according to the monitored temperature, thereby achieving precise heat dissipation for the area where each heat sink is located and reducing heat dissipation energy consumption.

[0013] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a heat conducting plate according to an embodiment of the present application; Figure 3 This is a schematic structural diagram of a heat sink according to an embodiment of the present application. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0016] It should be understood that the terms such as "having", "including" and "comprising" used in the embodiments of the present application do not exclude the existence or addition of one or more other elements or their combinations. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. When an element is referred to as "fixed on" or "set on" another element, it can be directly on the other element or there may be a centering element at the same time. When an element is referred to as "connecting" another element, it can be directly connected to another element or it can be indirectly connected to another element through a centering element. The description of "first", "second", etc. in the embodiments of the present application is only for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0017] It should be noted that the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0018] The inventor took into account the arrangement of the iron core and windings inside the oil tank, as well as the poor circulation of the transformer oil, which resulted in inconsistent temperatures in various areas of the oil tank. The prior art usually adopted a blind heat dissipation method, resulting in high heat dissipation energy consumption and the inability to quickly cool down the high-temperature area, which also affected the life and performance of the transformer.

[0019] In view of the above technical problems, the embodiments of the present application provide a new energy oil-immersed transformer, see Figure 1-2, comprising: a transformer body 1; a heat conducting plate 2, which is arranged on one side of the transformer body 1; a plurality of heat sinks 3, which are arranged at intervals on the surface of the heat conducting plate 2, the heat sink 3 is hollow inside, and heat sinks 4 are respectively arranged inside the heat sink 3, and the water inlet and water outlet of the heat sink 4 pass through one side of the heat sink 3 and are respectively connected to a water inlet pipe 401 and a water outlet pipe 402, and a water pump 6 is arranged on the water inlet pipe 401; a controller, which is connected to the water pump 6 and is used to adjust the power of the water pump 6 according to the monitored temperature of the area where the heat sink 3 is located; that is, this embodiment independently controls the heat sinks 3 dispersed on the surface of the heat conducting plate 2, uses the controller to collect the temperature value of the area where the heat sink 3 is located in real time, and compares it with the preset target temperature, calculates the real-time temperature difference, and dynamically adjusts the power of the water pump 6 according to the real-time temperature difference, thereby reducing the heat dissipation energy consumption, and can individually and accurately dissipate the heat of each heat sink 3 and the corresponding transformer internal area through the heat sink 4, quickly dissipate the heat of the local high temperature area, and also reduce unnecessary heat dissipation energy consumption.

[0020] Exemplarily, the transformer body 1 includes an oil tank, an iron core and a winding, the oil tank is filled with transformer oil, and the iron core and the winding are immersed in the transformer oil; For example, one surface of the heat conducting plate 2 is attached to one side surface of the oil tank, covering the side surface as much as possible, and the heat conducting plate 2 is made of a metal material with good thermal conductivity; Exemplarily, a plurality of heat sinks 3 are distributed at intervals on the other surface of the heat conducting plate 2, the heat sinks 3 are perpendicular to the heat conducting plate 2, the heat sinks 3 are arranged at intervals, and the heat sinks 3 need to be distributed in all areas of the heat conducting plate 2 as much as possible to achieve accurate heat dissipation in each area, and the heat sinks 3 can be made of copper alloy; Exemplarily, a cavity is formed inside the heat sink 3, the shape of the heat sink coil 4 matches the cavity, and the cavity is filled as much as possible. The heat sink coil 4 has a water inlet and a water outlet, the water inlet is connected to the water inlet pipe 401, and the water outlet pipe 402 is connected to the water outlet pipe 402. The water inlet pipe 401 and the water outlet pipe 402 are led out from one side of the heat sink 3, such as the side away from the heat conducting plate 2, and should not be led out from one of the two side surfaces of the heat sink 3, so as not to affect the natural heat dissipation effect; Exemplarily, a water pump 6 is provided on the water inlet pipe 401, and the water pump 6 is a variable frequency water pump 6 capable of adjusting power; Exemplarily, a temperature sensor 5 is provided on the heat conducting plate 2 or the heat dissipating plate 3, for respectively obtaining the monitoring temperature of the area where the heat dissipating plate 3 is located; Exemplarily, the controller calculates the difference between the monitored temperature and the preset target temperature, and determines the power of water pump 6 based on a predetermined relationship table between the temperature difference and the power of water pump 6; the relationship table is determined in advance through experiments to ensure that the monitored temperature can be reduced to a temperature close to the preset target temperature under the power of water pump 6; the preset target temperature is determined based on the optimal operating temperature of the oil-immersed transformer.

[0021] In another embodiment, it further comprises: a plurality of temperature sensors 5, the plurality of temperature sensors 5 are distributed on the heat conducting plate 2, and the heat conducting plate 2 is divided into a plurality of monitoring areas, the plurality of heat dissipating plates 3 are respectively located in the plurality of monitoring areas, and the controller determines the monitoring temperature of each monitoring area according to the temperature value of the temperature sensor 5 corresponding to each monitoring area; Exemplarily, the monitored temperature may be an average value, a maximum value, or a central temperature value of the monitoring area obtained by interpolation calculation of the temperature values ​​of the temperature sensors 5 around the heat sink 3 .

[0022] In another embodiment, see Figure 2 , a plurality of the temperature sensors 5 form a rectangular array on the heat conducting plate 2, and each of the heat dissipation plates 3 is surrounded by four of the temperature sensors 5; in this way, the temperature of each area of ​​the heat conducting plate 2 can be monitored and cooled as much as possible, thereby improving the precise cooling effect.

[0023] In another embodiment, the controller constructs a variation curve of the monitored temperature in a predetermined time period, constructs a power variation curve according to the variation curve and a preset target temperature, and controls the power of the water pump 6 according to the power variation curve; Exemplarily, the change curve can be determined based on the historical monitored temperature, such as by establishing a regression model or a machine learning model to predict the monitored temperature, and then establishing the change curve; Exemplarily, according to physics, the temperature difference between the temperature in each time interval in the change curve and the preset target temperature is correlated with the water flow in the heat dissipation coil 4, that is, it is correlated with the power of the water pump 6. A water pump cooling test can be carried out to establish an empirical relationship between the temperature difference and the power of the water pump 6, and then the power change curve can be obtained according to the change curve, the preset target temperature and the empirical relationship, and the water pump 6 can be controlled according to the power change curve.

[0024] In another embodiment, the controller obtains the monitored temperature, transformer operation time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure of several historical time intervals of each of the monitored areas, and inputs them into a prediction model, outputs the predicted monitored temperature of a future time interval, and constructs the change curve of a predetermined time period according to the predicted monitored temperature; the prediction model uses the historical data of the monitored temperature, transformer operation time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure, inputs them into a BP neural network, and obtains them through training; The present embodiment provides a method for accurately predicting the monitored temperature, that is, a training set is established based on historical data, the training set includes the monitored temperature, transformer operation time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure in each historical time interval, the monitored temperature, transformer operation time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure in more than two past time intervals are used as input, and the monitored temperature in the next time interval is used as output, and a BP neural network is trained to obtain a prediction model; the monitoring temperature in each time interval within a predetermined time period is predicted by using the prediction model to obtain multiple predicted monitored temperatures for the construction of a change curve; after testing with a test set, the accuracy is higher than that of the established polynomial model and random forest model; the predetermined time period can be 1 h, 2 h, 6 h, etc., and the time interval can be 10 min, 20 min, 30 min, etc., which is not specifically limited in the present embodiment and can be determined according to the actual control accuracy; the monitored temperature can be determined by the method of the above embodiment, the transformer operation time can be determined according to the operation record, and the ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure can be obtained through networking or by setting sensors locally.

[0025] In another embodiment, the controller also obtains the water temperature value in the water inlet pipe 401, and compares it with the water temperature reference value to obtain the water temperature difference, and corrects the power change curve according to the water temperature difference; the above embodiment takes into account the situation where the water temperature is at a constant water temperature reference value. In actual application, the water temperature may fluctuate. The water temperature of the water inlet pipe 401 is synchronously obtained in each time interval, and the current water pump 6 power is multiplied by a correction coefficient according to the temperature difference. The correction coefficient can be determined through experience or experiments.

[0026] In another embodiment, the heat dissipation coil 4 is obtained by bending or winding a metal tube multiple times, and is used for rectangular and disc-shaped heat dissipation plates 3 respectively.

[0027] In another embodiment, the water inlet pipe 401 and the water outlet pipe 402 are connected to a water tank for supplying water to each heat dissipation coil 4 .

[0028] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. New energy oil-immersed transformer, characterized in that: include: Transformer body; A heat conducting plate, which is arranged on one side of the transformer body; A plurality of heat sinks are arranged at intervals on the surface of the heat conducting plate, the heat sinks are hollow inside, heat sinks are respectively provided inside, a water inlet and a water outlet of the heat sink pass through one side of the heat sink and are respectively connected to a water inlet pipe and a water outlet pipe, and a water pump is provided on the water inlet pipe; A controller is connected to the water pump and is used to adjust the power of the water pump according to the monitored temperature of the area where the heat sink is located.

2. The new energy oil-immersed transformer according to claim 1, characterized in that: Also includes: Multiple temperature sensors are distributed on the heat conducting plate and divide the heat conducting plate into multiple monitoring areas. Multiple heat dissipation plates are respectively located in the multiple monitoring areas. The controller determines the monitoring temperature of each monitoring area according to the temperature value of the temperature sensor corresponding to each monitoring area.

3. The new energy oil-immersed transformer according to claim 2, characterized in that: The plurality of temperature sensors form a rectangular array on the heat conducting plate, and each heat dissipation plate is surrounded by four temperature sensors.

4. The new energy oil-immersed transformer according to claim 2, characterized in that: The controller constructs a variation curve of the monitored temperature in a predetermined time period, constructs a power variation curve according to the variation curve and a preset target temperature, and controls the power of the water pump according to the power variation curve.

5. The new energy oil-immersed transformer according to claim 3, characterized in that: The controller obtains the monitored temperature, transformer operating time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure in several historical time intervals of each of the monitored areas, and inputs them into a prediction model, outputs the predicted monitored temperature in a future time interval, and constructs the change curve of a predetermined time period based on the predicted monitored temperature; the prediction model uses the historical data of the monitored temperature, transformer operating time, ambient temperature, ambient humidity, ambient wind speed, and ambient air pressure, inputs them into a BP neural network, and is trained.

6. The new energy oil-immersed transformer according to claim 4, characterized in that: The controller also obtains the water temperature value in the water inlet pipe and compares it with the water temperature reference value to obtain the water temperature difference, and corrects the power change curve according to the water temperature difference.

7. The new energy oil-immersed transformer according to claim 1, characterized in that: The heat dissipation coil is obtained by bending or winding a metal tube multiple times.

8. The new energy oil-immersed transformer according to claim 1, characterized in that: The water inlet pipe and the water outlet pipe are connected to a water tank.

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