CN117153528A - Cooling device of transformer and control method thereof - Google Patents

Abstract

The application discloses a cooling device of a transformer and a control method thereof. The micro-channel structure of the core body comprises a transformer oil channel and a cooling medium channel, the transformer oil and the cooling medium exchange heat in the core body, and the micro-channel structure of the core body saves the space occupied by the cooling device, so that the transformer can work in an environment with limited space; the control module can acquire a temperature signal of the temperature sensor group and a flow signal of the flowmeter, and control the flow of the transformer oil and the cooling medium so as to adjust the cooling capacity of the cooling device, thereby achieving the purpose of saving energy and improving the operation efficiency of the cooling device.

Description

Cooling device for transformer and control method thereof

Technical field

The present application belongs to the technical field of transformer cooling equipment, and in particular relates to a cooling device for a transformer and a control method thereof.

Background technique

The cooling device is a key component of the transformer and is mainly divided into air cooling device and water cooling device. For the water cooling device, its working principle is to send the high-temperature transformer oil on the top layer of the transformer into the cooling core of the cooler through the oil pump, transfer the heat generated by the high-temperature transformer oil to the cooling core, and then transfer the heat to the cooling water from the cooling core. The cooling water is supplied by a water pump, which pumps the cold water into the cooler core to take away the heat released from the cooling core to accelerate the cooling of the hot oil. The cooled oil enters the lower oil tank of the transformer from the lower end of the cooler or directly enters the winding oil passage.

The main function of the cooling device is to dissipate the heat generated by the total loss of the transformer during operation through heat exchange, including no-load loss and load loss and stray loss of each winding at full load, thereby controlling the temperature of the transformer during operation within a reasonable range within to ensure safe operation of the transformer.

However, the actual working environment of the transformer includes a closed and space-limited environment, which requires high size requirements for the transformer and its accessories. Conventional air cooling devices and water cooling devices cannot meet the requirements of actual operating conditions. Therefore, there is a need for a cooling device for a transformer that is compact and operates efficiently in a space-limited, enclosed environment.

Contents of the invention

In view of this, the present application provides a cooling device of a transformer and a control method thereof to solve the problem that the cooling device of the existing transformer cannot operate in a closed environment with limited space.

In order to solve the above problems, this application provides the following solutions:

A cooling device for a transformer, including:

The core body has a micro-channel structure, including a transformer oil channel and a cooling medium channel, and the transformer oil and cooling medium perform heat exchange in the core body;

Temperature sensor groups installed at the inlet and outlet of the core;

A flow meter installed at the inlet of the core;

A control module, configured to obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter, and control the flow rate of the transformer oil and the cooling medium to adjust the cooling capacity of the cooling device.

Optionally, the core body includes a first core body and a second core body, and the first core body and the second core body are assembled into the core body of the microchannel structure.

Optionally, the core body is obtained by stacking and brazing fins, partitions and seals in sequence;

The fins are used to be arranged into preset channels, and the preset channels include the transformer oil channel and the cooling medium channel;

The partition is used to isolate the transformer oil channel and the cooling medium channel;

The seal is used to close the preset channel and support the core.

Optionally, the core is an aluminum alloy channel structure with an anti-corrosion coating sprayed on the outside.

Optional, the cooling medium is environmentally friendly vegetable insulating oil.

Optionally, the core inlet includes a transformer oil inlet and a cooling medium inlet;

The core outlet includes a transformer oil outlet and a cooling medium outlet.

Optionally, the control module includes a calculation module, a variable frequency pump or a valve;

The calculation module is used to calculate the cooling capacity of the cooling device, and control the variable frequency pump or valve according to the cooling capacity to adjust the flow rate of the cooling device.

Optionally, it also includes an operation and maintenance analysis module;

The operation and maintenance analysis module is used to obtain the temperature signal and the flow signal, and calculate the cooling capacity of the cooling device based on the temperature signal and the flow signal, thereby monitoring the operating status of the cooling device.

A method for controlling a cooling device of a transformer, applied to a control module, including:

Obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter;

Calculate cooling capacity based on the temperature signal and the flow signal;

Adjust the valve or variable frequency pump according to the cooling capacity to control the flow rate of the cooling device.

It can be seen from the above solution that the cooling device and its control method of the transformer disclosed in this application include a core with a micro-channel structure, a temperature sensor group installed at the core inlet and core outlet, and a flow sensor installed at the core inlet. design and control module. The micro-channel structure of the core includes transformer oil channels and cooling medium channels. Transformer oil and cooling medium exchange heat in the core. The micro-channel structure of the core saves the space required for the cooling device, allowing the transformer to operate in limited spaces. Operating in an environment; the control module can obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter, control the flow of transformer oil and cooling medium, to adjust the cooling capacity of the cooling device, achieve the purpose of energy saving, thereby improving the operation of the cooling device efficiency.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only This is an embodiment of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is an example diagram of an air cooling device in the known technology provided by this application;

Figure 2 is an example diagram of a water cooling device in the known technology provided by this application;

Figure 3 is an example diagram of a single core provided by this application;

Figure 4 is an example diagram of a transformer cooling device provided by this application;

Figure 5 is an example diagram of the core provided by this application;

Figure 6 is an example diagram of the internal structure of the core provided by this application;

FIG. 7 is a schematic flowchart of the control method of the transformer cooling device provided by this application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

As used herein, the term "include" and its variations are open-ended, ie, "including but not limited to." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; and the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below.

It should be noted that concepts such as “first” and “second” mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units. Or interdependence.

It should be noted that the modifications of "one" and "multiple" mentioned in this application are illustrative and not restrictive. Those skilled in the art will understand that unless the context clearly indicates otherwise, it should be understood as "one or Multiple”.

Referring to Figure 1, this application provides an example diagram of an air cooling device in the known technology. As shown in the figure, the fluid channel in the device is a straight channel. The cooling device is very large, which increases the overall volume of the transformer. It is not conducive to the transportation and maintenance of transformers. Similarly, referring to Figure 2, this application provides an example diagram of a water cooling device in the known technology. As shown in the figure, the water cooling device in the known technology also has the problem of being large in size.

For transformers, the working environment is diverse. For example, a closed environment with limited space has high requirements on the size of the transformer, such as a tower. If the transformer uses a water cooling device in the known technology, the size requirements of the tower for the transformer cannot be met. Therefore, in order to ensure that the transformer can operate normally in a working environment with size requirements, this application proposes a compact and efficient cooling device for a transformer that can operate in a limited space and closed environment.

Optionally, the cooling device of the transformer provided by this application includes a core with a micro-channel structure. The core includes a transformer oil channel and a cooling medium channel, and the transformer oil and cooling medium perform heat exchange in the core; a temperature sensor group installed at the inlet and outlet of the core; a flow meter installed at the inlet of the core; a control module , used to obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter, and control the flow of transformer oil and cooling medium to adjust the cooling capacity of the cooling device.

Exemplarily, see Figure 3, which is an example diagram of a single core provided by this application. As shown in the figure, a single core includes an inlet and an outlet. When the upper port of the core is the inlet, the lower port is the outlet. , when the upper port of the core is the outlet, the lower port is the inlet.

It should be noted that the core of the cooling device provided by the present application may be a core group including a first core and a second core, and is used in combination with two single cores.

Refer to Figure 4, an example diagram of a transformer cooling device provided by this application, as shown in the figure:

The core body includes an oil inlet 1, an oil outlet 2, a cooling medium inlet 3, a cooling medium outlet 4, an oil flow channel 5, and a cooling medium channel 6. The core is mainly assembled from two individual cores. When the cooling device is working, it can be driven by the oil pump, so that the hot oil inside the transformer flows in from the oil inlet 1 of the cooling device, and the hot oil flows out from the oil outlet 2 through the oil flow path 5 inside the cooling device; driven by the cooling medium pump , the cooling medium flows in from the cooling medium inlet 3 of the cooling device, and the cooling medium flows out from the cooling medium outlet 4 through the cooling medium path 6 inside the cooling device. During the circulation process, the transformer oil and the cooling medium exchange heat, cool the hot transformer oil, and then export the cooled transformer oil out of the transformer through the pipeline, thereby reducing the temperature of the transformer oil and controlling the temperature of the transformer during operation within a reasonable range. , to ensure the safe operation of the transformer.

It should be noted that the cooling medium can be environmentally friendly vegetable insulating oil, and environmentally friendly vegetable insulating oil can achieve the purpose of environmental protection. The cooling medium can also be water or water plus ethanol, etc.

It should be noted that the core is made up of fins, partitions, and seals that are stacked and brazed in sequence. The function of the fins is to arrange them into preset flow channels. The preset flow channels can be configured according to the specific working environment of the transformer. Determine, and then braze according to the predetermined flow channel. The core of the resulting microchannel structure can meet the volume requirements in the actual operating environment.

For example, see Figure 5, an example diagram of a core provided in this application, as shown in the figure:

The core is made up of fins, partitions, and seals that are stacked and brazed in sequence, including transformer oil channels and cooling medium channels. Different channels have different shapes of flow routes, which can ensure the cooling performance of the cooling device. , the volume of the compressed cooling device meets the space requirements of the transformer working environment.

For example, see FIG. 6 , which is an example diagram of the internal structure of the core provided in this application. as the picture shows:

The cooling medium and transformer oil flow through the adjacent channels respectively, which ensures sufficient contact between the transformer oil and the cooling medium, and heat exchange occurs through convection and heat conduction of the hot and cold media.

The temperature sensors in the temperature sensor group are installed at the oil inlet, oil outlet, cooling medium inlet, and cooling medium outlet respectively. They are used to measure the temperature signals of the transformer oil and cooling medium, and transmit the obtained temperature signals to the control module. .

The flow meter is installed at the oil inlet and cooling medium inlet to measure the flow of transformer oil and cooling medium, and transmit the measured flow signal to the control module.

Control modules include computing modules, variable frequency pumps or valves. Specifically, the calculation module is used to calculate the cooling capacity of the cooling device, control the variable frequency pump or valve opening angle according to the cooling capacity to adjust the flow of the cooling device, and flexibly control the flow of transformer oil or cooling medium according to the cooling capacity, thereby achieving the purpose of energy saving.

Specifically, the control module obtains the temperature signal of the temperature sensor group and the flow signal of the flow meter, and uses the cooling capacity calculation formula to calculate the cooling capacity of the cooling device. The cooling capacity calculation formula can be the cooling capacity calculation formula in JB/T 8315. Then, adjust the valve angle or control the variable frequency pump according to the cooling capacity, so that the cooling capacity of the cooling device can be adjusted according to the load and temperature rise of the branch transformer to achieve the purpose of energy saving.

The core of the cooling device provided by this application adopts brazed micro-channel technology. It has a compact structure and is much smaller than the cooling device in the known technology. It is light in weight. If the cooling device provided by this application weighs about 70kg, while the cooling device in the known technology weighs about 70kg. A cooling device with the same capacity is about 600kg; it has strong pressure-bearing capacity. The cooling device in the known technology can bear a pressure of 0.5MPa, and the cooling device provided by this application can bear a pressure of 1.5Mpa; it is well sealed. The core of the cooling device provided by this application is made of solder. Welded; corrosion-resistant, the core of the cooling device provided by this application can be made of aluminum alloy with good corrosion resistance, and the exterior is sprayed with an anti-corrosion coating, which can meet the anti-corrosion performance standards used on offshore platforms; high-efficiency; energy-saving, provided by this application The cooling device can accurately control the flow of the cooling device according to the temperature rise or load of the transformer; it is environmentally friendly. The cooling device provided by this application can use environmentally friendly plant insulating oil as the cooling medium.

The cooling device provided by this application can determine the transformer oil channel and cooling medium channel according to the actual working environment before assembling and brazing the cooling device, and can design different cooling devices for different working environments; the cooling device provided by this application Due to its small size, it is easy to transport and maintain, reducing transportation and maintenance costs.

To sum up, the cooling device of the transformer disclosed in this application includes a core with a micro-channel structure, a temperature sensor group installed at the core inlet and core outlet, a flow meter installed at the core inlet and a control module. The micro-channel structure of the core includes transformer oil channels and cooling medium channels. Transformer oil and cooling medium exchange heat in the core. The micro-channel structure of the core saves the space required for the cooling device, allowing the transformer to operate in limited spaces. Work in an environment; the control module can obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter, control the flow of transformer oil and cooling medium to adjust the cooling capacity of the cooling device, achieve the purpose of energy saving, and thereby improve the operation of the cooling device efficiency.

Optionally, the cooling device of the above transformer also includes an operation and maintenance analysis module. The operation and maintenance analysis module can calculate the cooling capacity of the cooling device, monitor the operating status of the cooling device, and evaluate the operating status of the cooling device.

The operation and maintenance analysis module can be an operation and maintenance analysis system for the transformer. The operation and maintenance analysis system can include background calculation and analysis software. This software can obtain temperature signals and flow signals and calculate the cooling capacity of the cooling device. The cooling capacity can characterize the cooling of the cooling device. ability. The calculated cooling capacity is evaluated and analyzed to achieve the purpose of monitoring the operating status of the cooling device.

For the cooling device of the transformer provided by the present application, the present application provides a control method of the cooling device of the transformer. Refer to Figure 7, which is a schematic flow chart of the control method of the cooling device of the transformer provided by the present application. As shown in the figure, the The control method of the cooling device is applied to the control module and includes the following steps:

Step 101: Obtain the temperature signal of the temperature sensor group and the flow signal of the flow meter.

The control module mainly includes calculation module, variable frequency pump or valve. The calculation module obtains temperature signals and flow signals from the temperature sensor group and the flow meter.

Step 102: Calculate the cooling capacity based on the temperature signal and the flow signal.

The calculation module calculates the cooling capacity of the cooling device based on the temperature signal and the flow signal.

Step 103: Adjust the valve or variable frequency pump according to the cooling capacity to control the flow rate of the cooling device.

The calculation module calculates the cooling capacity and adjusts the flow rate of the cooling device by controlling the variable frequency pump or adjusting the valve opening angle.

The above only describes the best embodiments of the present application, but it cannot be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. All changes made within the protection scope of the independent claims of this application are within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing specific embodiments only and is not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments are referred to each other. Can.

For the convenience of description, when describing the above system or device, the functions are divided into various modules or units and described separately. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and/or hardware.

Finally, it should be noted that in this article, relational terms such as first, second, third, fourth, etc. are only used to distinguish one entity or operation from another entity or operation, and do not Any such actual relationship or sequence between these entities or operations must not be required or implied. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications can also be made. should be regarded as the scope of protection of this application.

Claims (9)

1. A cooling device for a transformer, comprising:

the micro-channel cooling device comprises a core body with a micro-channel structure, a cooling medium and a cooling medium, wherein the core body comprises a transformer oil channel and a cooling medium channel, and the transformer oil and the cooling medium exchange heat in the core body;

temperature sensor groups arranged at the inlet and the outlet of the core body;

a flow meter mounted at an inlet of the core;

and the control module is used for acquiring a temperature signal of the temperature sensor group and a flow signal of the flowmeter, and controlling the flow of the transformer oil and the cooling medium so as to adjust the cooling capacity of the cooling device.

2. The cooling device of a transformer of claim 1, wherein the core comprises a first core and a second core, the first core and the second core assembled into a core of the microchannel structure.

3. The cooling device of the transformer according to claim 1, wherein the core is obtained by sequentially stacking and brazing fins, a separator and a seal;

the fins are arranged into preset channels, and the preset channels comprise the transformer oil channels and the cooling medium channels;

the separator is used for isolating the transformer oil channel and the cooling medium channel;

the seal is used for sealing the preset channel and supporting the core body.

4. The cooling device of a transformer according to claim 1, wherein the core is an aluminum alloy channel structure with an externally sprayed anti-corrosion coating.

5. The cooling device of the transformer according to claim 1, wherein the cooling medium is an environment-friendly vegetable insulating oil.

6. The cooling device of a transformer according to claim 1, wherein the core inlet comprises a transformer oil inlet and a cooling medium inlet;

the core outlet comprises a transformer oil outlet and a cooling medium outlet.

7. The cooling device of a transformer according to claim 1, wherein the control module comprises a calculation module, a variable frequency pump or a valve;

the calculating module is used for calculating the cooling capacity of the cooling device and controlling the variable frequency pump or the valve according to the cooling capacity so as to adjust the flow of the cooling device.

8. The cooling device of the transformer according to claim 1, further comprising an operation and maintenance analysis module;

the operation and maintenance analysis module is used for acquiring the temperature signal and the flow signal, and calculating the cooling capacity of the cooling device according to the temperature signal and the flow signal so as to monitor the running state of the cooling device.

9. A control method of a cooling device of a transformer, applied to a control module, comprising:

acquiring a temperature signal of a temperature sensor group and a flow signal of a flowmeter;

calculating a cooling capacity from the temperature signal and the flow signal;

and controlling the flow of the cooling device according to the cooling capacity regulating valve or the variable frequency pump.