Cottonseed-based natural ester oil insulation transformer box body

Abstract

According to the cottonseed-based natural ester oil insulation transformer box body, a capsule oil conservator is installed at one end of the top of the transformer box body, is filled with cottonseed-based natural ester insulating oil and is communicated with heat dissipation oil in the inner space of the box body through a pipeline; the other end of the box body is provided with an on-load tap-changer; a plurality of finned radiators are respectively mounted on the left and right sides of the box body, and oil pipes of the finned radiators are connected with the interior of the transformer box body to form heat-conducting oil circulation heat dissipation; an oil surface temperature controller and a winding temperature controller are mounted at the end part of the box body; a gas relay and a pressure relief valve are mounted at the top of the box body; an oil drain valve, an oil sample valve and a grounding bolt are installed at the bottom of the box body. The capsule oil conservator has the beneficial effects that the capsule oil conservator can be used for supplementing lost heat-conducting oil into the transformer box body or guiding redundant heat-conducting oil into the capsule oil conservator. The on-load tap-changer can adjust the gear of the winding in the transformer box body; and the heat-conducting oil of the radiator is connected with the heat-conducting oil in the transformer box body to form heat-conducting oil circulating heat dissipation.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a transformer housing insulated with cottonseed-based natural ester oil. Background Technology

[0002] Under the national policy of "peak carbon emissions and carbon neutrality," the power industry is rapidly developing new energy sectors. Natural ester insulating oil can seamlessly integrate with these technologies, not only solving the problems of traditional mineral transformer oil's difficulty in degradation, environmental pollution, and safety concerns, but also significantly improving transformer fire resistance, operational stability, and service life, while reducing the incidence of power grid accidents. It plays an increasingly important role in the field of new energy power generation. However, the main raw material for the production of natural ester insulating oil currently on the market is soybean oil, which presents problems of high cost and food security constraints. This patent uses cottonseed oil, which has lower edible value, higher yield, and lower price, to convert into natural ester insulating oil to replace transformer insulating oil. This not only has the advantage of being completely biodegradable, but also boasts a more efficient, green, energy-saving, and environmentally friendly manufacturing process, achieving zero carbon emissions. Cottonseed-based natural ester oil transformers not only solve the problems of high pour point and high viscosity leading to low-temperature cold start and complex heat dissipation structures in the currently widely used soybean-based insulating oil transformers, but also align with the national trend of green and low-carbon transformation, providing strong support for the transformative technological iteration of natural ester insulating oil transformers. As the world's largest cotton-producing country, my country accounts for more than a quarter of global cotton production, and the high yield of cottonseed oil also makes it a vast market for conversion into industrial oil. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this utility model provides an environmentally friendly and energy-efficient transformer housing insulated with cottonseed-based natural ester oil.

[0004] This utility model is achieved through the following technical solution:

[0005] The cottonseed-based natural ester oil insulated transformer housing of this utility model is characterized by:

[0006] A capsule oil reservoir is installed at one end of the top of the transformer tank, which contains cottonseed-based natural ester insulating oil. It is connected to the heat dissipation oil inside the transformer tank through a pipeline.

[0007] A load tap changer is installed at the other end of the transformer housing;

[0008] Several plate-type radiators are installed on the left and right sides of the transformer tank. The oil pipes of the plate-type radiators are connected to the inside of the transformer tank to form a heat-conducting oil circulation for heat dissipation.

[0009] An oil level temperature controller and a winding temperature controller are installed at the end of the transformer tank.

[0010] A gas relay and a pressure relief valve are also installed on the top of the transformer enclosure;

[0011] An oil drain valve, an oil sample valve, and a grounding bolt are installed at the bottom of the transformer enclosure.

[0012] In a further preferred embodiment, a high-voltage terminal box is also installed on the top of the transformer housing, which contains a high-voltage cable plug. One end of the high-voltage cable plug is connected to the high-voltage winding inside the transformer housing via a high-voltage lead, and the other end is connected to an external high-voltage cable via a high-voltage gland. A high-voltage gland is installed at the point where the high-voltage cable passes through the wall of the high-voltage terminal box.

[0013] In a further preferred embodiment, a low-voltage cable box is also installed on the top of the transformer enclosure. Inside the low-voltage cable box, a low-voltage outgoing copper busbar is installed with support from low-voltage post insulators. One end of the low-voltage outgoing copper busbar is connected to a low-voltage bushing, which is connected to the low-voltage winding inside the transformer enclosure via a low-voltage lead wire. The other end of the low-voltage outgoing copper busbar is connected to an external low-voltage cable via a low-voltage gland. A low-voltage gland is installed at the point where the low-voltage cable passes through the wall of the low-voltage cable box.

[0014] In a further preferred embodiment, several lifting ramps are installed on the upper part of the transformer enclosure for hoisting and moving the transformer; a base is installed at the bottom of the transformer enclosure; and a nameplate is installed on the side wall of the transformer enclosure to identify the transformer's specifications and model.

[0015] The beneficial effects of this invention are as follows: the capsule oil conservator can replenish the lost heat transfer oil in the transformer tank or guide excess heat transfer oil into the capsule oil conservator. The on-load tap changer can adjust the tap position of the windings in the transformer tank; the heat transfer oil of the radiator is connected to the heat transfer oil inside the transformer tank, forming a heat transfer oil circulation for heat dissipation. The oil level temperature controller can detect and adjust the temperature of the heat transfer oil; the winding temperature controller can detect and control the winding temperature. The pressure relief valve can regulate the air pressure inside the transformer tank, maintaining a suitable air pressure inside the tank.

[0016] Practice has proven that cottonseed-based natural ester oil-insulated environmentally friendly high-efficiency transformers not only possess the advantages of fully biodegradable natural esters, but also feature a more efficient, green, energy-saving, and environmentally friendly manufacturing process, achieving zero carbon emissions. Cottonseed-based natural ester oil transformers not only solve the problems of high pour point and high viscosity leading to low-temperature cold starts and complex heat dissipation structures in soybean-based insulating oil transformers currently widely used in China, but also align with the national trend of green and low-carbon transformation. The transformer's total life-cycle cost is reduced, extending its lifespan by at least 33%, ensuring the stability of the power system; it is energy-saving and environmentally friendly, reducing carbon emissions to achieve "zero-carbon electricity," reducing energy loss, and improving the global greenhouse gas response; it contributes to low-carbon and green development, providing users with green and efficient new energy services. Attached Figure Description

[0017] Figure 1 , Figure 2 The following are schematic diagrams of the front view and top view of this utility model, respectively.

[0018] In the diagram: 1. On-load switch, 2. Switch gas relay, 3. Surface plate heat sink, 4. Main gas relay, 5. Capsule oil conservator, 6. Main oil level gauge, 7. Low-voltage cable box, 8. Low-voltage outgoing copper busbar, 9. Low-voltage post insulator, 10. Low-voltage bushing, 11. Hanging rod, 12. Oil level temperature controller, 13. Winding temperature controller, 14. Low-voltage gland, 15. Transformer nameplate, 16. Copper valve, 17. Main secondary terminal box, 18. Copper drain valve, 19. Oil sample valve, 20. High-voltage cable plug, 21. High-voltage cable box, 22. High-voltage gland, 23. Temperature controller plug seat, 24. Mercury thermometer plug seat, 25. Drain plug, 26. Grounding bolt, 27. Pressure relief valve, 28. Protection integrated detection system terminal box, 29. Sensor detection and acquisition module. Detailed Implementation

[0019] The attached figure shows a specific embodiment of this utility model.

[0020] This utility model relates to a transformer housing insulated with cottonseed-based natural ester oil.

[0021] A capsule oil tank 5 is installed at one end of the top of the transformer box, which contains cottonseed-based natural ester insulating oil. It is connected to the heat dissipation oil inside the transformer box through a pipe.

[0022] A load tap changer 1 is installed at the other end of the transformer housing;

[0023] Several plate-type radiators 3 are installed on the left and right sides of the transformer box, and the oil pipes of the plate-type radiators are connected to the inside of the transformer box to form a heat-conducting oil circulation for heat dissipation.

[0024] An oil level temperature controller 12 and a winding temperature controller 13 are installed at the end of the transformer tank.

[0025] Gas relay 4 and pressure relief valve 27 are also installed on the top of the transformer enclosure;

[0026] An oil drain valve 18, an oil sample valve 19, and a grounding bolt 26 are installed at the bottom of the transformer tank.

[0027] A high-voltage terminal box 21 is also installed on the top of the transformer housing, which contains a high-voltage cable plug 20. One end of the high-voltage cable plug 20 is connected to the high-voltage winding inside the transformer housing via a high-voltage lead, and the other end is connected to the external high-voltage cable via a high-voltage gland 22. A high-voltage gland is installed at the part of the high-voltage cable that passes through the wall of the high-voltage terminal box.

[0028] A low-voltage cable box 7 is also installed on the top of the transformer box. Inside the low-voltage cable box, a low-voltage outgoing copper busbar 8 is installed, supported by a low-voltage post insulator 9. One end of the low-voltage outgoing copper busbar 8 is connected to a low-voltage bushing 10, which is connected to the low-voltage winding inside the transformer box via a low-voltage lead wire. The other end of the low-voltage outgoing copper busbar is connected to an external low-voltage cable via a low-voltage gland 14. A low-voltage gland is installed at the part of the low-voltage cable that passes through the box wall of the low-voltage cable box.

[0029] Several lifting ramps 11 are installed on the upper part of the transformer enclosure for lifting and moving the transformer; a base is installed at the bottom of the transformer enclosure; a nameplate 15 is installed on the side wall of the transformer enclosure to identify the transformer's specifications and model.

[0030] Cottonseed-based natural ester oil insulated transformer, (1) Kinematic viscosity of cottonseed oil (40℃) ≤26mm2 / s; pour point ≤-38℃; breakdown voltage (2.5mm) ≥65kV; water content ≤30mg / kg; dielectric loss factor (tanδ) (90℃) ≤0.015; acid value ≤0.02 mgKOH / g-1; free of corrosive sulfur; total additives (mass fraction) ≤5%; ignition point ≥300℃; flash point ≥250℃.

[0031] (2) After being impregnated in natural ester at 125℃ for 165h, the change in hardness of the insulating solid is <±5 degrees; the change rate of solid volume is <1%; the change rate of cottonseed oil dielectric loss factor is <1%; the change in acid value is <0.1mg·KOH·g-1; and the change in withstand voltage is <10kV.

[0032] (3) The temperature rise limit can be increased to over 130K; the overload capacity can reach over 20%; and the structural design margin of typical transformers can be increased by 20%.

[0033] (4) An integrated multi-sensor detection system is adopted.

Claims

1. A transformer housing insulated with cottonseed-based natural ester oil, characterized in that: A capsule oil tank (5) is installed at one end of the top of the transformer box, which contains cottonseed-based natural ester insulating oil. It is connected to the heat dissipation oil inside the transformer box through a pipe. A load tap changer (1) is installed at the other end of the transformer housing; Several plate-type radiators (3) are installed on the left and right sides of the transformer box respectively. The oil pipes of the plate-type radiators are connected to the inside of the transformer box to form a heat-conducting oil circulation for heat dissipation. An oil level temperature controller (12) and a winding temperature controller (13) are installed at the end of the transformer housing. A gas relay (4) and a pressure relief valve (27) are also installed on the top of the transformer enclosure. An oil drain valve (18), an oil sample valve (19), and a grounding bolt (26) are installed at the bottom of the transformer housing.

2. The transformer housing insulated with cottonseed-based natural ester oil according to claim 1, characterized in that: A high-voltage terminal box (21) is also installed on the top of the transformer box, which contains a high-voltage cable plug (20). One end of the high-voltage cable plug is connected to the high-voltage winding inside the transformer box via a high-voltage lead, and the other end is connected to the external high-voltage cable via a high-voltage gland (22). A high-voltage gland is installed at the part of the high-voltage cable that passes through the box wall of the high-voltage terminal box.

3. The transformer housing insulated with cottonseed-based natural ester oil according to claim 1, characterized in that: A low-voltage cable box (7) is also installed on the top of the transformer box. Inside the low-voltage cable box, a low-voltage outgoing copper busbar (8) is installed with support from a low-voltage post insulator (9). One end of the low-voltage outgoing copper busbar (8) is connected to a low-voltage bushing (10). The low-voltage bushing is connected to the low-voltage winding inside the transformer box via a low-voltage lead wire. The other end of the low-voltage outgoing copper busbar is connected to an external low-voltage cable via a low-voltage gland (14). A low-voltage gland is installed at the part of the low-voltage cable that passes through the box wall of the low-voltage cable box.

4. The transformer housing insulated with cottonseed-based natural ester oil according to claim 1, characterized in that: Several lifting ramps (11) are installed on the upper part of the transformer box for lifting and moving the transformer; a base is installed at the bottom of the transformer box; a nameplate (15) is installed on the side wall of the transformer box to identify the specifications and model of the transformer.

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