Outdoor oil-immersed distribution transformer for high-reliability and high-efficiency heat dissipation court

Abstract

The invention discloses an outdoor high-reliability efficient heat dissipation transformer area oil-immersed distribution transformer which comprises an integrated epoxy pouring type nonmetal box cover and an integrated epoxy pouring type nonmetal oil tank, and a rubber sealing or resin end sealing mode is adopted between the box cover and the oil tank. The tank cover is provided with a high-voltage base wire outlet device, a low-voltage sleeve wire outlet device, a pressure relief valve fixing device and a tapping outlet head device which are integrally poured by epoxy, and the transformer radiator is fixedly welded with the oil tank. According to the transformer area oil-immersed distribution transformer provided by the invention, the tank cover and the oil tank both adopt an integrated epoxy pouring type structure, and the oil tank is more reliably connected with the tank cover part and external components, so that a more reliable power supply mode under severe working conditions can be realized; the operation environment is wider, the anti-corrosion and moisture-proof performance is more excellent, the product protection and the like reach IP66 or above, and the social and economic benefits are good.

Description

Technical Field

[0001] This invention relates to the field of power transmission equipment technology. Specifically, it is an outdoor, high-reliability, high-efficiency heat-dissipating oil-immersed distribution transformer for use in power distribution substations, typically with a high voltage of 10kV and an overhead line layout. Background Technology

[0002] In China, overhead power lines typically use oil-immersed distribution transformers, which are designed according to the standard for distribution areas. This type of transformer is widely used in outdoor power distribution scenarios due to its mature technical solutions, good overload performance, and adaptability.

[0003] However, existing oil-immersed distribution transformers face increasingly severe environmental challenges during actual operation, especially in outdoor applications near coastal areas where the harsh operating environment is particularly pronounced. Coastal areas have consistently high humidity levels and the air contains high concentrations of salt and other corrosive media. These corrosive media, combined with the high humidity, continuously corrode and erode the transformer's casing, insulating bushings, and sealing structures. This not only leads to component performance degradation but may also compromise the transformer's sealing integrity, causing problems such as moisture absorption of the insulating oil and decreased insulation performance, seriously threatening the transformer's operational reliability.

[0004] Besides harsh environments such as coastal areas, oil-immersed distribution transformers in underground substations for urban lighting also face unique environmental challenges. Underground substations are relatively enclosed spaces with poor air circulation, generally high humidity, and a tendency for condensation, placing more stringent demands on the transformer's moisture-proof performance. Existing moisture-proof designs for oil-immersed distribution transformers are mostly designed for conventional environments and are insufficient to provide effective protection in the high-humidity underground environment. Moisture intrusion can easily lead to aging of insulation components and deterioration of electrical performance, ultimately affecting the transformer's operational reliability. Therefore, developing a highly reliable, heat-dissipating oil-immersed distribution transformer with stronger corrosion resistance, more reliable operation, better heat dissipation, and more economical operation has become an urgent technical problem to be solved in the field of power grid equipment. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide an outdoor high-reliability and high-efficiency heat dissipation oil-immersed distribution transformer for substations, which can effectively solve the problems of insufficient corrosion resistance, moisture resistance, heat dissipation and reliability of existing substation oil-immersed distribution transformers in harsh environments.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An outdoor high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer includes an integrated epoxy cast non-metallic tank cover and an integrated epoxy cast non-metallic oil tank. The tank cover and the oil tank are sealed with rubber or resin end seals. The tank cover is equipped with an integrated epoxy cast high-voltage base outlet device, a low-voltage bushing outlet device, a pressure relief valve fixing device, and a tap outlet device. The transformer radiator is welded and fixed to the oil tank.

[0007] Preferably, the aforementioned integrated epoxy-cast non-metallic fuel tank adopts an epoxy-cast corrugated wall, with both the inner and outer walls being epoxy resin-cast structures, and a mesh aluminum plate installed between the inner and outer walls.

[0008] Preferably, the aforementioned one-piece epoxy casting non-metallic box cover adopts an epoxy casting box wall, with both the inner and outer walls being epoxy resin casting structures, and a metal aluminum plate installed between the inner and outer walls.

[0009] Preferably, the inner side of the box cover is fitted with a non-metallic aluminum explosion-proof film.

[0010] Preferably, the above-mentioned transformer radiator is an integrated horizontally assembled aluminum radiator. The radiator base of the transformer radiator is welded and fixed to the aluminum plate inside the tank cover and then integrally epoxy cast. The heat dissipation tube of the transformer radiator is welded and sealed to the mesh metal aluminum plate inside the tank.

[0011] Preferably, the tap changer in the above-mentioned tap outlet device is of the copper connecting plate type.

[0012] Preferably, the high-voltage base cable outlet device adopts a pluggable cable head structure.

[0013] The technical solution of the present invention achieves the following beneficial technical effects: 1. The oil-immersed distribution transformer for substations provided by this invention adopts an integrated epoxy casting structure for both the tank cover and the oil tank, making the connection between the oil tank and the tank cover and external components more reliable, and enabling a more reliable power supply under harsh working conditions. 2. The oil-immersed distribution transformer for substations provided by this invention replaces the traditional steel plate heat dissipation and adopts an integrated welded structure, which has higher cooling efficiency. 3. The oil-immersed distribution transformer for substations provided by this invention has a reduced internal insulation distance, allowing for a wider range of operating environments, superior corrosion and moisture resistance, and protection ratings of IP66 or higher, resulting in good social and economic benefits. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a structural diagram of the box cover of the present invention; Figure 5 This is a top view of the box cover of the present invention.

[0015] The reference numerals in the figure are as follows: 1-High voltage base outlet device; 2-Oil tank; 3-Radiator base; 4-Box cover; 5-Transformer oil; 6-Non-metallic box cover aluminum explosion-proof film; 7-Aluminum plate; 8-Transformer radiator; 9-Low voltage bushing outlet device; 10-Pressure relief valve fixing device; 11-Tap outlet device; 12-Transformer body coil lead. Detailed Implementation

[0016] like Figure 1 , 5 As shown, this invention mainly includes an integrated epoxy cast non-metallic tank cover 4, an oil tank 2, a transformer radiator 8, a tap changer device 11, a transformer body, transformer oil 5, and high and low voltage output devices. The capacity of this invention is generally 400kVA and below. The voltage is 10.5kV / 0.4kV, and its low-voltage terminal is generally connected to the JP cabinet equipment.

[0017] The cover 4 is an integral epoxy casting structure, featuring an integrated epoxy high-voltage base outlet device (high-voltage bushing copper terminal device) 1, a radiator base 3, a low-voltage bushing outlet device (low-voltage outlet copper busbar device) 9, and a pressure relief valve fixing device 10. The high-voltage base outlet device 1 adopts an integrated casting type, replacing the traditional assembled component mode and eliminating the rubber sealing heat pad. Simultaneously, the copper terminal inside the bushing also adopts a cross-shaped structure for better fixation with the epoxy resin. Similarly, the low-voltage bushing outlet device 9 adopts the same method, changing the traditional porcelain bushing and sealing gasket type to an integrated casting method. The low-voltage bushing outlet device 9 includes an integrally cast conductive rod, where the low-voltage outlet busbar also uses a cross-shaped method for fixation with epoxy resin.

[0018] The high-voltage unit can be equipped with a double bushing, one of which is the power supply and the other can be configured with a surge arrester. The low-voltage output device can be equipped with a closed low-voltage connection device. The tap changer in the tap output device 11 can be implemented by a connecting piece.

[0019] The radiator base 3 is made of aluminum and is welded to the aluminum plate 7 in the middle of the tank cover 4 to achieve a seal between the transformer radiator 8 and the tank body 2, eliminating the need for traditional sealing gaskets. The transformer radiator 8 is a horizontally assembled aluminum radiator with a single joint, and after molding, it is externally powder-coated to prevent long-term oxidation and water immersion. The round tube of the aluminum radiator 8 is effectively welded to the aluminum metal surface inside the tank 2, resulting in high sealing performance. The radiator base 3 is also integrally cast with the non-metallic tank cover 4. The pressure relief valve fixing device 10 also uses welding and integral casting to achieve a seal.

[0020] Fuel tank 2 includes a rectangular corrugated wall with a mesh aluminum plate in the middle. The inner and outer sides are made of epoxy resin with filler and mesh cloth. The exterior has a corrugated structure, and the bottom of the interior of fuel tank 2 has a grounding bolt.

[0021] To enhance product safety, a non-metallic aluminum explosion-proof membrane 6 is installed inside the cover 4, which provides pressure relief when the pressure relief valve fails to operate effectively. A tap changer device 11 is also installed inside the cover 4, using a copper connecting plate type instead of a traditional tap changer. It is also integrally cast with the cover 4.

[0022] The non-metallic oil tank 2 adopts an epoxy-cast corrugated heat dissipation method, with the middle aluminum plate cast together with epoxy resin and equipped with a grounding device. Due to the non-metallic structure of the oil tank 2, the insulation distance between the transformer coil leads 12 and the transformer tank can be reduced, achieving product miniaturization. Simultaneously, transformer oil 5 is injected into the transformer to achieve insulation and heat dissipation.

[0023] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. An outdoor, high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer, characterized in that, It includes an integrated epoxy cast non-metallic tank cover (4) and an integrated epoxy cast non-metallic oil tank (2). The tank cover (4) and the oil tank (2) are sealed with rubber or resin end seal. The tank cover (4) is equipped with an integrated epoxy cast high voltage base outlet device (1), a low voltage bushing outlet device (9), a pressure relief valve fixing device (10), and a tap outlet device (11). The transformer radiator (8) is welded and fixed to the oil tank (2).

2. The outdoor high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 1, characterized in that, The integrated epoxy cast non-metallic oil tank (2) adopts an epoxy cast corrugated wall, with both the inner and outer walls being epoxy resin cast structures, and a mesh metal aluminum plate installed between the inner and outer walls.

3. The outdoor high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 1, characterized in that, The integrated epoxy casting non-metallic box cover (4) adopts an epoxy casting box wall, with both the inner and outer walls being epoxy resin casting structures, and a metal aluminum plate (7) installed between the inner and outer walls.

4. The outdoor high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 3, characterized in that, The inner side of the box cover (4) is fitted with a non-metallic box cover aluminum explosion-proof film (6).

5. The outdoor high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 1, characterized in that, The transformer radiator (8) is an integrated horizontally assembled aluminum radiator. The radiator base (3) of the transformer radiator (8) is welded and fixed to the aluminum plate (7) inside the box cover (4) and then integrally epoxy cast. The heat dissipation round pipe of the transformer radiator (8) is welded and sealed to the mesh metal aluminum plate inside the box body (2).

6. The external high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 1, characterized in that, The tap changer in the tap changer device (11) is of the copper connecting plate type.

7. The external high-reliability, high-efficiency heat dissipation oil-immersed distribution transformer according to claim 1, characterized in that, The high-voltage base cable outlet device (1) adopts a pluggable cable head structure.

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