Evaporative cooling type transformer with partition spraying and temperature control functions

Abstract

The invention discloses an evaporative cooling type transformer with partition spraying and temperature control functions, and relates to the technical field of cooling of power equipment. The transformer comprises a transformer box body, an iron core, a coil, a cooling pump, a condenser, a first pipeline, a plurality of partition spraying pipelines, an electromagnetic valve, a temperature sensor and an electric control box. The box body is filled with inert cooling gas, the subarea spraying pipelines are respectively arranged in upper, middle and lower cooling areas of a coil and an iron core, an outlet of the cooling pump is connected with the spraying pipelines, and the front ends of the spraying pipelines are provided with electromagnetic valves which can be independently controlled; the temperature sensors are distributed in all areas and used for collecting temperature data in real time, the electric control box controls opening and closing of the corresponding electromagnetic valves according to the temperature conditions of all the areas, and accurate and partitioned cooling control is achieved. The cooling efficiency and the response speed can be remarkably improved, energy waste caused by invalid spraying is avoided, and the system has the advantages of being reasonable in structure, high in intelligent degree, stable in operation and the like and is suitable for heat dissipation management of the high-power transformer under the high-load working condition.

Description

Technical Field

[0001] The present invention relates to an evaporative cooling transformer with partitioned spraying and temperature control, which is applicable to the interior of power equipment with large loads. Background Art

[0002] With the continuous expansion of the power system capacity and the continuous increase of the electrical load, as the core equipment of the power grid operation, the operation temperature control of the transformer plays a crucial role in the safety, stability and life of the equipment. Traditional transformers mostly adopt oil-immersed or air-cooled, water-cooled and other methods for heat dissipation. In recent years, due to its high efficiency and energy saving, the evaporative cooling technology has been gradually popularized in large transformers.

[0003] In the existing evaporative cooling transformers, the common structure is to spray the cooling medium (such as SF6) from the top or side walls to the surfaces of the iron core and coils through a uniformly arranged spraying system, so as to take away the heat generated during the operation of the equipment. Although this kind of structure can achieve a certain cooling effect, there are the following obvious defects in actual application:

[0004] Uneven cooling coverage. The traditional spraying systems are mostly single-area spraying or full-coverage nozzle arrangements. The cooling medium often cannot accurately act on the parts with the most concentrated heat, resulting in over-cooling in some areas and insufficient cooling in key parts; especially in the case of high-load operation or uneven heat, local overheating is difficult to relieve in time, posing a safety hazard.

[0005] Lagged response and high energy consumption. The traditional systems mostly adopt the control mode of "overall spraying after the temperature reaches the threshold", lacking a targeted on-demand adjustment mechanism; even if the temperature in only one area is too high, the entire system will be triggered to operate, resulting in waste of the cooling medium and additional energy consumption.

[0006] Difficulty in adapting to the changes of the dynamic thermal field. Under different operating conditions (such as start-stop, load increase, sudden abnormality), the heat distribution inside the transformer is constantly changing, while the traditional spraying method cannot flexibly adapt to such thermal field fluctuations in space and time.

[0007] To solve the above problems, the present invention proposes a new type of evaporative cooling transformer combining partitioned spraying and temperature control:

[0008] The interior area of the transformer is divided into three cooling partitions: upper, middle and lower;

[0009] Each area is provided with an independent spraying pipeline and an electromagnetic valve, which can be independently controlled to start and stop;

[0010] At the same time, distributed temperature sensors are arranged in each key heat-generating area to monitor the heat change in real time;

[0011] The control system dynamically determines the opening position and time of the spray according to the temperature of each area, realizing a precise cooling strategy of "spraying where it's hot", "spraying immediately when it's hot", and "stopping immediately after spraying".

[0012] By introducing a regionalized spraying mechanism and a multi-point temperature control feedback system in the structure, the present invention solves the problems of uneven cooling, high energy consumption, and slow response of traditional evaporative cooling transformers, significantly improving the thermal control intelligence level, safety and reliability, and energy-saving operation ability of the equipment, and having good application prospects and promotion value in the field of high-load and high-capacity transformers. Summary of the Invention

[0013] The purpose of the present invention is to provide an evaporative cooling transformer with partition spraying and temperature control. By setting up multi-region independent cooling channels and combining real-time temperature monitoring and automatic control mechanisms, precise and partitioned cooling of the transformer coil and core is achieved. The structure of the present invention is reasonable and the response is rapid, which can significantly improve the cooling efficiency, ensure the operation stability of the equipment, and at the same time has the advantages of energy saving, high adaptability, and easy maintenance, and is suitable for power system scenarios with large load and complex operation.

[0014] To achieve the above object, the present invention adopts the following technical solutions:

[0015] An evaporative cooling transformer with partition spraying and temperature control includes a box body, a core and a coil arranged inside the box body, and also includes a pump, a condenser, a return pipeline, a plurality of partition spraying pipelines, a plurality of solenoid valves, a distributed temperature sensor, and an electric control box. Among them:

[0016] The side of the box body is connected to the condenser through a pipeline for receiving the cooled medium to form an efficient closed-loop cooling system;

[0017] The bottom of the box body is provided with a sealing port and an outlet. The sealing port ensures the system tightness and operation stability, and the outlet is used to discharge the circulated cooling medium and convey it to the pump inlet;

[0018] The outlet of the pump is connected to the total inlet of a plurality of partition spraying pipelines. Each spraying pipeline leads to different cooling areas (such as the upper part, the middle part, and the lower part) of the core and the coil, and each pipeline is configured with an independent solenoid valve; the solenoid valve is used to separately control the start and stop of the spraying in each cooling area according to the control signal, so as to achieve partition cooling;

[0019] The first pipeline seals and connects the outlet at the bottom of the box body to the inlet of the pump to form a loop channel for the cooling medium to realize continuous recycling; the temperature sensor array is arranged at key parts inside each cooling partition to monitor the temperature of each area in real time;

[0020] The electric control box is used to collect temperature signals, determine whether they exceed the set threshold, control the opening and closing of the solenoid valves in the corresponding zones and the start and stop of the pumps, and automatically execute the cooling strategies for each zone;

[0021] The cooling medium is sulfur hexafluoride (SF6) or its environmentally friendly alternative mixture, which has good insulation and cooling performance.

[0022] Compared with traditional evaporative cooling transformers, the present invention has the following advantages:

[0023] It realizes independent zone spraying, with more targeted cooling and higher energy efficiency; through temperature sensor and solenoid valve control, it realizes intelligent temperature control response; it avoids the waste of resources caused by overall spraying, effectively saves the cooling medium and energy; the structure design is simple, the system runs stably and is easy to maintain; it improves the cooling adaptability of the transformer under different loads and operating environments, and significantly improves the safety and service life. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of an evaporative cooling transformer device with zone spraying and temperature control according to the present invention;

[0025] Reference numerals in the figure: 1, transformer housing; 11, first pipeline outlet; 12, upper outlet of gas channel; 13, lower outlet of gas channel; 2, transformer iron core; 3, transformer coil; 4, pump; 5, condenser; 6, first pipeline; 7, second pipeline; 71, zone spraying pipeline (upper part); 72, zone spraying pipeline (middle part); 73, zone spraying pipeline (lower part); 81, solenoid valve (upper part); 82, solenoid valve (middle part); 83, solenoid valve (lower part); 9, electric control box.

Claims

1. A novel evaporation-cooled transformer combining partitioned spray and temperature control, characterized in that, It includes:

1. Transformer box body; 11. First pipeline outlet; 12. Upper outlet of gas channel; 13. Lower outlet of gas channel; 2. Transformer iron core; 3. Transformer coil; 4. Pump; 5. Condenser; 6. First pipeline; 7. Second pipeline; 71. Partitioned spray pipeline (upper part); 72. Partitioned spray pipeline (middle part); 73. Partitioned spray pipeline (lower part); 81. Electromagnetic valve (upper part); 82. Electromagnetic valve (middle part); 83. Electromagnetic valve (lower part); 9. Electric control box. Among them, the box body 1 serves as the main body shell of the device of the present invention, and its interior is filled with an inert gas with excellent insulation and heat capacity as the cooling medium. In this embodiment, sulfur hexafluoride (SF6) gas is preferably used. This gas has excellent electrical insulation performance and strong heat conduction and heat storage capabilities, and can effectively absorb and carry away the heat generated during the operation of the transformer, ensuring the stable operation of the device under high-temperature conditions. To ensure the tightness and maintainability of the cooling system, a sealing port is provided at the bottom of the box body 1 for inspecting and maintaining the internal structure when necessary, and at the same time preventing the leakage of the cooling medium. In addition, a cooling medium outlet is also provided at the center of the bottom of the box body for discharging the gas after heat exchange, thereby effectively releasing the heat. The side wall of the box body 1 is connected to the condenser 5 through a pipeline. The condenser is a key component in the cooling system, and its function is to cool the high-temperature SF6 gas discharged from the box body to a suitable temperature and then send it back into the system. The condenser is connected to the box body through two interfaces (i.e., the upper outlet 12 and the lower outlet 13 of the inert gas channel) provided on the side of the box body, enabling the cooling medium to flow smoothly in the cycle and return to the box body after completing the cooling process to form a closed loop. In addition, to maintain the flow of the cooling medium, one end of the second pipeline 7 is connected to the outlet of the pump 4, and the other end is branched into three outlet pipes 71, 72, and 73 from the side of the box body 1 and arranged at different heights of the upper, middle, and lower positions for spraying. The function of the pump 4 is to promote the flow of the cooling medium, ensuring that the sulfur hexafluoride gas forms a continuous cooling cycle in the device. Through the second pipeline 7, the pump 4 can guide the cooling medium discharged from the condenser 5 to the upper part of the iron core 2 and the coil 3, thereby effectively reducing the temperature of the electrical equipment and avoiding overheating. The inlet of the pump 4 is hermetically connected to the outlet 12 at the center of the bottom of the box body 1 through the first pipeline 6 to form a complete cooling circuit. In this way, the cooling medium flows in the entire system, continuously absorbing and carrying away heat, thereby ensuring that the device can still maintain a stable working temperature during long-term operation. Through the close cooperation of the above pipelines and components, the entire cooling system realizes efficient and continuous heat transfer and effectively maintains the normal operation of the device.

2. The transformer device according to claim 1, characterized in that, Temperature sensors 31, 32, and 33 are respectively arranged in the upper, middle, and lower layers of the iron core and the coil to monitor the temperature changes in each area. The sensors transmit the data to the electric control box 9 in real time. Inside the electric control box 9, there are integrated a temperature data acquisition module, a control instruction generation module, and a solenoid valve control module. It can judge whether the set threshold is exceeded according to the sensor data, control the opening or closing of the solenoid valves 81, 82, and 83 in the corresponding areas, and at the same time control the start and stop of the pump 4 to achieve an efficient and on-demand cooling cycle.

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