Cooling device of main transformer

Abstract

The utility model provides a cooling device of a main transformer, which relates to the field of cooling equipment for the main transformer and comprises a transformer shell, the transformer shell is used for protecting a transformer core, and insulating oil and a cooling component are added in the transformer shell. Comprising cooling fins and a first fan which are used for cooling a transformer shell, a frame fixed to one side of the transformer shell, a coiled pipe, fins and a second fan which are used for cooling insulating oil, and a circulation assembly which comprises a circulation pump and a backflow pipe communicated with the transformer shell and the liquid inlet end of the circulation pump. According to the transformer temperature monitored by the thermocouple and the liquid level information monitored by the liquid level sensor through the PLC in the control assembly, the first electromagnetic valve, the second electromagnetic valve, the first fan, the second fan and the circulating pump are intelligently regulated and controlled through the relay and the frequency converter; therefore, operation parameters of the cooling device can be flexibly adjusted according to actual conditions, and the energy-saving effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of cooling equipment for main transformers, specifically a cooling device for main transformers. Background Technology

[0002] The main transformer is a core device in a power system used for voltage conversion and power transmission. It mainly consists of a casing, iron core, coils, and protective devices. The iron core and coils are immersed in a casing filled with insulating oil, as follows: Figure 7 As shown, main transformers are widely used in power plants, substations, industrial and commercial fields. During operation, main transformers generate a lot of heat, so cooling and heat dissipation are required to ensure their normal operation and extend their service life.

[0003] The main methods for heat dissipation of the main transformer are as follows:

[0004] Natural cooling: Heat is dissipated through radiation from the tank walls and radiators, as well as natural air convection. It is suitable for small-capacity oil-immersed transformers and dry-type transformers.

[0005] Air-cooled: Based on natural cooling, a fan is added to accelerate airflow and improve heat dissipation efficiency. It is suitable for medium-sized oil-immersed transformers and dry-type transformers.

[0006] Forced oil circulation air cooling: The oil is pumped into the cooler for cooling and then circulated back to the oil tank. It is suitable for large-capacity oil-immersed main transformers.

[0007] Forced oil circulation water cooling: Similar to forced oil circulation air cooling, but uses water as the cooling medium. It is suitable for large-capacity transformers, especially step-up transformers in hydropower plants.

[0008] Forced guided oil circulation air cooling and water cooling: Improves cooling efficiency through guided oil circulation, suitable for higher capacity transformers;

[0009] However, in actual use, regardless of which of the above methods is used to cool the main transformer, and the cooling mode is a fixed mode, the cooling device cannot adjust the cooling according to the actual temperature changes, resulting in energy waste.

[0010] In summary, this utility model provides a cooling device for a main transformer to solve the above-mentioned problems. Utility Model Content

[0011] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0012] A cooling device for a main transformer includes a transformer housing for core protection and filled with insulating oil; a cooling assembly including heat sinks and a first fan for cooling the transformer housing; a frame fixed to one side of the transformer housing; a serpentine tube, fins, and a second fan for cooling the insulating oil; and a support plate for supporting the frame; and a circulation assembly including a circulation pump; a return pipe connected to the transformer housing and the inlet of the circulation pump; a guide pipe connected to the outlet of the circulation pump and the inlet of the serpentine tube; a circulation pipe connected to the outlet of the serpentine tube; an oil inlet pipe connected to the oil inlet of the transformer housing; a first solenoid valve mounted on the surface of the guide pipe; and a... The second solenoid valve is located on the surface of the circulation pipe, and the other end of the circulation pipe is connected to the oil inlet pipe. The control assembly includes a control box fixed to the transformer housing, a second liquid level sensor and a thermocouple fixed to the surface of the transformer housing, and a PLC controller, relays, frequency converters, and a display fixed inside the control box. The output terminals of the second liquid level sensor and the thermocouple are both connected to the input terminals of the PLC controller. The output terminals of the PLC controller are respectively connected to the input terminals of the relays, frequency converters, and the display. The output terminals of the relays are respectively connected to the input terminals of the first solenoid valve and the second solenoid valve. The output terminals of the frequency converter are respectively connected to the input terminals of the first fan, the second fan, and the circulation pump.

[0013] Furthermore, in this utility model, the fluid replenishment assembly includes an oil storage tank, a fluid replenishment pipe communicating with the transformer housing and the oil storage tank, a third solenoid valve installed on the surface of the fluid replenishment pipe, a first liquid level sensor fixed to one side of the oil storage tank, and an oil tank cover installed on the top of the oil storage tank. The output terminal of the first liquid level sensor is connected to the input terminal of the PLC controller, and the output terminal of the PLC controller is connected to the input terminal of the third solenoid valve.

[0014] Furthermore, in this utility model, the support plate is fixedly connected to the transformer housing, the frame is fixedly connected to the support plate by bolts, and the serpentine tube is fixed to the inner cavity of the frame.

[0015] Furthermore, in this utility model, the fins are fixed to the surface of the serpentine tube, the heat sink is fixedly connected to the transformer housing, the first fan is fixed to the surface of the heat sink, and the second fan is fixed to the back of the frame.

[0016] Furthermore, in this utility model, the oil storage tank is fixedly connected to the transformer housing, and two first liquid level sensors are provided, located at the upper and lower ends of the surface of the oil storage tank respectively, with the detection end of the first liquid level sensor penetrating into the inner cavity of the oil storage tank.

[0017] Furthermore, in this utility model, two second liquid level sensors are provided, and the detection ends of both extend into the inner cavity of the transformer housing. The two second liquid level sensors are used to monitor the highest liquid level and the warning liquid level in the inner cavity of the transformer housing, respectively, and the detection end of the thermocouple penetrates into the inner cavity of the transformer housing.

[0018] Furthermore, in this invention, the control component is installed on one side of the transformer housing, the circulation component is installed on the other side of the transformer housing, and the oil inlet pipe is fixed to the top of the transformer housing.

[0019] Beneficial effects: This utility model has the following beneficial effects:

[0020] This invention utilizes a PLC controller in its control components to intelligently regulate the first solenoid valve, second solenoid valve, first fan, second fan, and circulating pump based on the transformer temperature monitored by thermocouples and the liquid level information monitored by liquid level sensors. This is achieved through relays and a frequency converter. When the transformer temperature rises, the PLC controller can increase the fan speed and the circulating pump flow rate to accelerate heat dissipation. Conversely, when the temperature decreases, the fan speed and circulating pump flow rate are correspondingly reduced to save energy. This allows for flexible adjustment of the cooling device's operating parameters according to actual conditions, thereby improving energy efficiency.

[0021] This invention employs multiple heat dissipation methods working in tandem to effectively cool the main transformer. The heat sink and the first fan directly dissipate heat from the transformer casing, quickly dissipating the heat generated by the transformer into the surrounding environment. The serpentine tube, fins, and the second fan cool the insulating oil. The insulating oil absorbs heat during transformer operation and flows into the serpentine tube through the circulation assembly. The fins increase the heat dissipation area, and the second fan accelerates airflow, further improving heat dissipation efficiency. Through these multiple heat dissipation methods, the transformer temperature can be effectively reduced, ensuring stable operation in a suitable temperature environment and reducing faults and damage caused by overheating. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 2 This is a side view structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the transformer housing and cooling assembly in their separated state according to this utility model.

[0025] Figure 4 This is a schematic diagram of the separated structure of the frame, serpentine tube, and fins of this utility model;

[0026] Figure 5 This is a schematic diagram of the main structure of the control box of this utility model;

[0027] Figure 6 This is a schematic diagram of the system flow of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of a main transformer in the prior art.

[0029] In the picture:

[0030] 100. Transformer housing; 200. Cooling assembly; 210. Heat sink; 220. First fan; 230. Frame; 240. Serpentine tube; 250. Fin; 260. Second fan; 270. Support plate; 300. Circulation assembly; 310. Circulation pump; 320. Return pipe; 330. Guide pipe; 340. Circulation pipe; 350. Oil inlet pipe; 360. First solenoid valve; 370. Second solenoid valve; 400. Liquid replenishment assembly; 410. Oil tank; 420. Liquid replenishment pipe; 430. Third solenoid valve; 440. First liquid level sensor; 450. Oil tank cover; 500. Control assembly; 510. Control box; 520. Second liquid level sensor; 530. Thermocouple; 540. PLC controller; 550. Relay; 560. Frequency converter; 570. Display. Detailed Implementation

[0031] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0032] Example 1

[0033] like Figure 1-6The image shows the first embodiment of this utility model, which provides a cooling device for a main transformer. The device includes a transformer housing 100, which protects the transformer core and contains insulating oil. A cooling assembly 200 includes heat sinks 210 and a first fan 220 for cooling the transformer housing 100, a frame 230 fixed to one side of the transformer housing 100, a serpentine tube 240 for cooling the insulating oil, fins 250, and a second fan 260, as well as a support plate 270 for supporting the frame 230. A circulation assembly 300 includes a circulation pump 310, a return pipe 320 connected to the transformer housing 100 and the inlet of the circulation pump 310, a guide pipe 330 connected to the outlet of the circulation pump 310 and the inlet of the serpentine tube 240, a circulation pipe 340 connected to the outlet of the serpentine tube 240, an oil inlet pipe 350 connected to the oil inlet of the transformer housing 100, and a first solenoid valve 330 mounted on the surface of the guide pipe 330. 60, and a second solenoid valve 370 installed on the surface of the circulation pipe 340, and the other end of the circulation pipe 340 is connected to the oil inlet pipe 350. The control assembly 500 includes a control box 510 fixed to the transformer housing 100, a second liquid level sensor 520 and a thermocouple 530 fixed to the surface of the transformer housing 100, and a PLC controller 540, a relay 550, a frequency converter 560 and a display 570 fixed in the inner cavity of the control box 510. The output terminals of the second liquid level sensor 520 and the thermocouple 530 are both connected to the input terminals of the PLC controller 540. The output terminals of the PLC controller 540 are respectively connected to the input terminals of the relay 550, the frequency converter 560 and the display 570. The output terminals of the relay 550 are respectively connected to the input terminals of the first solenoid valve 360 ​​and the second solenoid valve 370. The output terminals of the frequency converter 560 are respectively connected to the input terminals of the first fan 220, the second fan 260 and the circulation pump 310.

[0034] like Figure 1-6 As shown, the thermocouple 530 in the control component 500 can monitor the temperature inside the transformer housing 100 in real time. When the temperature changes, the thermocouple 530 converts the temperature signal into an electrical signal and transmits the signal to the PLC controller 540. After receiving the temperature signal from the thermocouple 530, the PLC controller 540 analyzes and processes the temperature data. When the temperature inside the transformer housing 100 rises, the PLC controller 540 adjusts the speed of the first fan 220, the second fan 260, and the circulating pump 310 through the frequency converter 560. Increasing the speed of the first fan 220 and the second fan 260 can enhance the heat dissipation effect and accelerate airflow. Increasing the speed of the circulating pump 310 can accelerate the circulation speed of the insulating oil, thereby more effectively removing heat. Conversely, when the temperature drops, the speed of the first fan 220, the second fan 260, and the circulating pump 310 is reduced to reduce unnecessary energy consumption.

[0035] The PLC controller 540 can also control the opening and closing of the first solenoid valve 360 ​​and the second solenoid valve 370 via the relay 550. When the temperature is high, the PLC controller 540 controls the relay 550 to open the first solenoid valve 360 ​​and the second solenoid valve 370, so that the insulating oil circulates through the circulation assembly 300, is cooled through the serpentine tube 240, and then flows back to the transformer housing 100. When the temperature drops to a certain level, the PLC controller 540 controls the relay 550 to close the first solenoid valve 360 ​​and the second solenoid valve 370, stopping the circulation of the insulating oil, thereby reducing energy consumption.

[0036] Example 2

[0037] Reference Figure 1-6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] In this embodiment, the fluid replenishment assembly 400 includes an oil storage tank 410, a fluid replenishment pipe 420 communicating with the transformer housing 100 and the oil storage tank 410, a third solenoid valve 430 installed on the surface of the fluid replenishment pipe 420, a first liquid level sensor 440 fixed to one side of the oil storage tank 410, and an oil tank cover 450 installed on the top of the oil storage tank 410. The output terminal of the first liquid level sensor 440 is connected to the input terminal of the PLC controller 540, and the output terminal of the PLC controller 540 is connected to the input terminal of the third solenoid valve 430.

[0039] The support plate 270 is fixedly connected to the transformer housing 100, the frame 230 is fixedly connected to the support plate 270 by bolts, and the serpentine tube 240 is fixed to the inner cavity of the frame 230.

[0040] Fins 250 are fixed to the surface of serpentine tube 240, heat sink 210 is fixedly connected to transformer housing 100, first fan 220 is fixed to the surface of heat sink 210, and second fan 260 is fixed to the back of frame 230.

[0041] The oil storage tank 410 is fixedly connected to the transformer housing 100. There are two first liquid level sensors 440, which are located at the upper and lower ends of the surface of the oil storage tank 410, respectively. The detection end of the first liquid level sensor 440 extends into the inner cavity of the oil storage tank 410.

[0042] Two second liquid level sensors 520 are provided, and the detection ends of both extend into the inner cavity of the transformer housing 100. The two second liquid level sensors 520 are used to monitor the highest liquid level and the warning liquid level in the inner cavity of the transformer housing 100, respectively. The detection end of the thermocouple 530 extends into the inner cavity of the transformer housing 100.

[0043] The control component 500 is installed on one side of the transformer housing 100, the circulation component 300 is installed on the other side of the transformer housing 100, and the oil inlet pipe 350 is fixed to the top of the transformer housing 100.

[0044] like Figure 1-6 As shown, the thermocouple 530 and the second liquid level sensor 520 in the control component 500 are responsible for monitoring the temperature and liquid level inside the transformer housing 100. The probe end of the thermocouple 530 extends into the inner cavity of the transformer housing 100, enabling it to sense the internal temperature in real time and transmit the temperature signal to the PLC controller 540. Two second liquid level sensors 520 are provided, with their probe ends extending into the inner cavity of the transformer housing 100, respectively used to monitor the highest liquid level and the warning liquid level inside the transformer housing 100, and also transmit the liquid level signal to the PLC controller 540. The liquid replenishment component 400 is used to automatically replenish the insulating oil in the transformer housing 100 when the liquid level is insufficient. The oil storage tank 410 is connected to the transformer housing 100 through the liquid replenishment pipe 420, and two first liquid level sensors are provided on one side of the oil storage tank 410. 440, located at the upper and lower ends of the surface respectively, has its detection end penetrating into the inner cavity of the oil tank 410 to monitor the liquid level in the oil tank 410. When the second liquid level sensor 520 detects that the liquid level in the transformer housing 100 is lower than the warning liquid level, the PLC controller 540 receives the liquid level signal. If the liquid level in the oil tank 410 is normal at this time, the PLC controller 540 will open the third solenoid valve 430 through the relay 550, so that the insulating oil in the oil tank 410 flows into the transformer housing 100 through the replenishment pipe 420 to achieve automatic liquid replenishment. When the liquid level in the transformer housing 100 reaches the maximum liquid level, the PLC controller 540 controls the third solenoid valve 430 to close and stop liquid replenishment, thereby ensuring that there is always enough insulating oil in the transformer housing 100 to ensure the normal operation of the cooling device.

[0045] During operation, thermocouple 530 detects the temperature inside the transformer housing 100 and transmits the temperature signal to PLC controller 540. Two second liquid level sensors 520 are provided to monitor the highest liquid level and the warning liquid level inside the transformer housing 100, respectively, and transmit the liquid level signal to PLC controller 540. Two first liquid level sensors 440 are located at the upper and lower ends of the surface of oil tank 410, respectively, to monitor the liquid level inside oil tank 410 and transmit the liquid level signal to PLC controller 540. PLC controller 540 processes the received temperature, liquid level and other information and transmits it to display 570 for display, so that the staff can understand the working status of the transformer in real time. At the same time, PLC controller 540 intelligently controls each component through relay 550 and frequency converter 560 based on the monitoring data to realize cooling and liquid replenishment, thereby realizing real-time monitoring of temperature and liquid level.

[0046] When thermocouple 530 detects an increase in temperature inside transformer housing 100, PLC controller 540 controls the first fan 220 to start via frequency converter 560, accelerating the heat dissipation of heat sink 210 and initially cooling transformer housing 100. PLC controller 540 opens the first solenoid valve 360 ​​and the second solenoid valve 370 via relay 550, and simultaneously starts circulation pump 310 via frequency converter 560. High-temperature insulating oil inside transformer housing 100 is drawn out by circulation pump 310 through return pipe 320 and flows into serpentine tube 240 through guide pipe 330. Fins 250 are fixed on the surface of serpentine tube 240. Second fan 260 accelerates airflow, enhancing the heat dissipation effect of serpentine tube 240 and cooling the insulating oil. The cooled insulating oil flows back to transformer housing 100 through circulation pipe 340 and oil inlet pipe 350, forming a circulating cooling system. This achieves the cooling function of the main transformer and insulating oil, thereby ensuring the normal operation of the main transformer.

[0047] When the second liquid level sensor 520 detects that the liquid level in the transformer housing 100 is lower than the warning level, the PLC controller 540 receives the signal. If the first liquid level sensor 440 detects that there is enough insulating oil in the oil tank 410, the third solenoid valve 430 is opened through the relay 550. The insulating oil in the oil tank 410 flows into the transformer housing 100 through the replenishment pipe 420 to replenish the liquid, thereby realizing the automatic liquid replenishment function.

[0048] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A cooling device for a main transformer, characterized in that: include, A transformer housing (100) is used for the protection of the transformer core and is filled with insulating oil. The cooling assembly (200) includes a heat sink (210) and a first fan (220) for heat dissipation of the transformer housing (100), a frame (230) fixed to one side of the transformer housing (100), a serpentine tube (240) for cooling the insulating oil, fins (250) and a second fan (260), and a support plate (270) for supporting the frame (230). The circulation assembly (300) includes a circulation pump (310), a return pipe (320) connected to the transformer housing (100) and the inlet of the circulation pump (310), a guide pipe (330) connected to the outlet of the circulation pump (310) and the inlet of the serpentine pipe (240), a circulation pipe (340) connected to the outlet of the serpentine pipe (240), an oil inlet pipe (350) connected to the oil inlet of the transformer housing (100), a first solenoid valve (360) mounted on the surface of the guide pipe (330), and a second solenoid valve (370) mounted on the surface of the circulation pipe (340), and the other end of the circulation pipe (340) is connected to the oil inlet pipe (350); The control assembly (500) includes a control box (510) fixed to the transformer housing (100), a second liquid level sensor (520) and a thermocouple (530) fixed to the surface of the transformer housing (100), and a PLC controller (540), a relay (550), a frequency converter (560) and a display (570) fixed to the inner cavity of the control box (510); The output terminals of the second liquid level sensor (520) and the thermocouple (530) are both connected to the input terminals of the PLC controller (540). The output terminals of the PLC controller (540) are respectively connected to the input terminals of the relay (550), the frequency converter (560) and the display (570). The output terminals of the relay (550) are respectively connected to the input terminals of the first solenoid valve (360) and the second solenoid valve (370). The output terminals of the frequency converter (560) are respectively connected to the input terminals of the first fan (220), the second fan (260) and the circulating pump (310).

2. The cooling device for the main transformer as described in claim 1, characterized in that: The fluid replenishment assembly (400) includes an oil tank (410), a fluid replenishment pipe (420) communicating with the transformer housing (100) and the oil tank (410), a third solenoid valve (430) installed on the surface of the fluid replenishment pipe (420), a first liquid level sensor (440) fixed to one side of the oil tank (410), and an oil tank cover (450) installed on the top of the oil tank (410). The output terminal of the first liquid level sensor (440) is connected to the input terminal of a PLC controller (540), and the output terminal of the PLC controller (540) is connected to the input terminal of the third solenoid valve (430).

3. The cooling device for the main transformer as described in claim 1, characterized in that: The support plate (270) is fixedly connected to the transformer housing (100), the frame (230) is fixedly connected to the support plate (270) by bolts, and the serpentine tube (240) is fixed to the inner cavity of the frame (230).

4. The cooling device for the main transformer as described in claim 1, characterized in that: The fins (250) are fixed to the surface of the serpentine tube (240), the heat sink (210) is fixedly connected to the transformer housing (100), the first fan (220) is fixed to the surface of the heat sink (210), and the second fan (260) is fixed to the back of the frame (230).

5. The cooling device for the main transformer as described in claim 2, characterized in that: The oil storage tank (410) is fixedly connected to the transformer housing (100). There are two first liquid level sensors (440), which are located at the upper and lower ends of the surface of the oil storage tank (410) respectively. The detection end of the first liquid level sensor (440) extends into the inner cavity of the oil storage tank (410).

6. The cooling device for the main transformer as described in claim 1, characterized in that: Two second liquid level sensors (520) are provided, and the detection ends of both extend into the inner cavity of the transformer housing (100). The two second liquid level sensors (520) are used to monitor the highest liquid level and the warning liquid level in the inner cavity of the transformer housing (100), respectively. The detection end of the thermocouple (530) extends into the inner cavity of the transformer housing (100).

7. The cooling device for the main transformer as described in claim 1, characterized in that: The control component (500) is installed on one side of the transformer housing (100), the circulation component (300) is installed on the other side of the transformer housing (100), and the oil inlet pipe (350) is fixed to the top of the transformer housing (100).

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