Double-loop vertical split type high-energy-efficiency distribution transformer for prefabricated cabin type substation

Abstract

The invention discloses a double-loop vertical split type high-energy-efficiency distribution transformer for a prefabricated cabin type substation. The distribution transformer comprises an upper transformer unit and a lower transformer unit which are vertically arranged, an upper transformer unit oil tank of the upper transformer unit and a lower transformer unit oil tank of the lower transformer unit are vertically distributed; and the lower part of the upper transformer unit body of the upper transformer unit and the lower transformer unit body of the lower transformer unit are symmetrically arranged up and down, namely, the winding direction of the high-voltage coil and the low-voltage coil of the upper transformer unit is opposite to that of the lower transformer unit. And mutual conduction of transformer oil in operation can be realized through an external connecting pipe. According to the low-loss and low-temperature-rise design, safe full-capacity operation of a product lower than 5K can still be ensured when the product operates in the box-type transformer substation, and the low-loss and low-temperature-rise low-loss box-type transformer substation has the advantages of being high in reliability, compact in structure, capable of performing energy-saving operation according to operation conditions, low in loss, high in reliability and the like. And external quick access of an external emergency power supply can be realized, and the operation reliability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of distribution transformer manufacturing, and in particular to a double-circuit vertical split high-efficiency distribution transformer for a prefabricated cabin-type substation. Background Art

[0002] Domestic 10kV fully indoor substations generally require civil structure design, occupy a large area, and have a long construction period. The transformer generally uses an epoxy cast dry-type transformer or a traditional oil-immersed transformer. If there are two outgoing lines, it is generally placed horizontally in the room.

[0003] Therefore, how to make the distribution transformer have a small footprint and a high space utilization coefficient structure, and how to design a special transformer to achieve higher operating economy and more flexible operation mode has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a double-circuit vertical split high-efficiency distribution transformer for a prefabricated cabin substation, the purpose of which is to make the distribution transformer have a small footprint and a high space utilization coefficient structure. The special transformer design can achieve higher operating economy and more flexible operation mode.

[0005] To achieve the above-mentioned object, the present invention discloses a double-circuit vertical split high-efficiency distribution transformer for a prefabricated cabin-type substation, comprising an upper transformer unit and a lower transformer unit arranged vertically;

[0006] The upper transformer unit oil tank of the upper transformer unit and the lower transformer unit oil tank of the lower transformer unit are vertically distributed;

[0007] The upper transformer unit oil tank and the lower transformer unit oil tank are filled with transformer oil;

[0008] The lower part of the upper transformer unit body of the upper transformer unit and the lower transformer unit body of the lower transformer unit are symmetrically arranged up and down, that is, the winding direction of the high and low voltage coils of the upper transformer unit is opposite to that of the lower transformer unit;

[0009] The epoxy resin type low-voltage bushing of the upper transformer unit is located at the lower part of the oil tank of the upper transformer unit, and the epoxy resin type low-voltage bushing of the lower transformer unit is located at the upper part of the oil tank of the lower transformer unit;

[0010] The high-voltage cable of the upper transformer unit is a high-voltage plug-in elbow-type bushing, which is arranged at the lower part of the side surface in the width direction of the upper transformer unit body; the high-voltage cable of the lower transformer unit is a high-voltage plug-in elbow-type bushing, which is arranged at the upper part of the side surface in the width direction of the lower transformer unit body;

[0011] The epoxy resin type low-voltage bushing pile heads of the upper transformer unit are all arranged on the lower side of the upper transformer unit body, and the epoxy resin type low-voltage bushing pile heads of the lower transformer unit are all arranged on the upper side of the lower transformer unit body;

[0012] The low-voltage emergency power input sockets of the upper transformer unit and the lower transformer unit are both arranged on the side of the corresponding upper transformer unit body or the side of the corresponding lower transformer unit body, and are both connected to the corresponding epoxy resin type low-voltage bushing pile head through an oil-immersed isolating switch.

[0013] Preferably, the upper part of the upper transformer unit oil tank of the upper transformer unit radiator of the upper transformer unit and the upper part of the lower transformer unit oil tank of the lower transformer unit radiator of the lower transformer unit are connected via an upper radiator connecting pipe;

[0014] The lower part of the upper transformer unit oil tank of the upper transformer unit radiator of the upper transformer unit and the lower part of the lower transformer unit oil tank of the lower transformer unit radiator of the lower transformer unit are connected through a radiator lower connecting pipe.

[0015] More preferably, a vacuum butterfly valve is used between the upper connecting pipe of the radiator and the oil tank of the upper transformer unit to connect after the upper transformer unit and the lower transformer unit are in place;

[0016] The vacuum butterfly valve is used to connect the lower connecting pipe of the radiator and the oil tank of the lower transformer unit after the upper transformer unit and the lower transformer unit are in place.

[0017] More preferably, the lower transformer unit oil tank is a reinforced structure, and an assembled structure is adopted between the lower transformer unit radiator.

[0018] More preferably, the upper transformer unit oil tank and the lower transformer unit oil tank are both provided with a pressure relief valve and a guide port, and are connected to the accident oil pool via the pressure relief valve and the guide port.

[0019] Preferably, the low-voltage outputs of the upper transformer unit and the lower transformer unit can be connected in parallel to the low-voltage switch cabinet through the busbar to make the epoxy resin type low-voltage bushing connected to the low-voltage switch cabinet or each can be independently connected to the two-way low-voltage switch cabinet through the busbar.

[0020] Preferably, it also includes a factory-prefabricated cement foundation;

[0021] The factory-prefabricated cement foundation includes an oil collection unit and a high-voltage cable inlet and outlet unit that are not interconnected;

[0022] The oil collection unit is located below the high-efficiency distribution transformer;

[0023] The high-voltage cable inlet and outlet unit is located below the high-voltage plug-in elbow bushing.

[0024] Preferably, the vegetable oil is flame-retardant and has a high ignition point, and can reach K-grade status; and the flash point of the vegetable oil is not less than 330°C.

[0025] Preferably, the upper transformer unit oil tank and the lower transformer unit oil tank are in communication.

[0026] Preferably, the epoxy resin type low-voltage casing pile head is provided with a low-voltage emergency power input port of an isolating switch.

[0027] Preferably, the upper transformer unit and the lower transformer unit are both first-level energy-efficient transformers.

[0028] Preferably, it also includes a low voltage external emergency power input port;

[0029] The low-voltage external emergency power input port forms a break between the low-voltage isolating switch in the upper transformer unit oil tank or the lower transformer unit oil tank and the coil low-voltage output busbar of the upper transformer unit or the lower transformer unit.

[0030] Beneficial effects of the present invention:

[0031] The low loss and low temperature rise design ensures that the product can still be operated below 5K in a prefabricated cabin substation. The product operates at full capacity and has the advantages of high reliability, compact structure, energy-saving operation according to operating conditions, low loss and high reliability.

[0032] The distribution transformer provided by the present invention can adjust the operation mode according to the operation load, and the transformer can be operated independently or interconnected through the butterfly valve and the upper and lower connecting pipes. The operation temperature rise is low, the loss is low, and the energy saving benefit is obvious.

[0033] The distribution transformer provided by the present invention adopts a vertical split body with a symmetrical design on the upper and lower parts, so that the product is easy and flexible to operate.

[0034] The distribution transformer provided by the present invention is more flexible in adopting high and low voltage side outlet lines, can realize the multifunctionality of high and low voltage power supply modes, and improves the power supply reliability.

[0035] The distribution transformer provided by the present invention adopts an isolating switch and an emergency power supply quick insertion device on the low-voltage side, which can realize the multifunctionality of the low-voltage power supply mode and improve the power supply reliability.

[0036] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front view schematic diagram of a double-circuit vertical split distribution transformer in one embodiment of the present invention.

[0038] Figure 2 It is a side view schematic diagram of a double-circuit vertical split distribution transformer in one embodiment of the present invention.

[0039] Figure 3 Schematic diagram of the external layout of a double-circuit vertical split distribution transformer in one embodiment of the present invention.

[0040] Figure 4 Schematic diagram of a top view of a double-circuit vertical split distribution transformer in one embodiment of the present invention.

[0041] Figure 5 This is a schematic diagram of a top view of a factory-prefabricated cement foundation for a dual-circuit vertical split distribution transformer in one embodiment of the present invention.

[0042] Figure 6 It is a side view schematic diagram of one side of a factory-prefabricated cement foundation for a dual-circuit vertical split distribution transformer in one embodiment of the present invention.

[0043] Figure 7 This is a side view of the other side of the factory-prefabricated cement foundation for a dual-circuit vertical split distribution transformer in one embodiment of the present invention.

[0044] In the figure: 1 is the upper transformer unit body, 2 is the lower transformer unit body, 3 is the high-voltage pluggable elbow bushing, 4 is the oil-immersed isolating switch, 5 is the low-voltage emergency power input, 6 is the radiator upper connecting pipe, 7 is the upper transformer unit radiator, 8 is the epoxy resin type low-voltage bushing pile head, 9 is the radiator lower connecting pipe, 10 is the upper transformer unit oil tank, 11 is the lower transformer unit oil tank, 12 is the lower transformer unit radiator, and 13 is the factory-prefabricated cement foundation. DETAILED DESCRIPTION

[0045] Example

[0046] like Figures 1 to 4 As shown, a double-circuit vertical split high-efficiency distribution transformer for a prefabricated cabin-type substation includes an upper transformer unit and a lower transformer unit arranged vertically;

[0047] The upper transformer unit oil tank 10 of the upper transformer unit and the lower transformer unit oil tank 11 of the lower transformer unit are vertically arranged;

[0048] The upper transformer unit oil tank 10 and the lower transformer unit oil tank 11 are filled with transformer oil;

[0049] The lower part of the upper transformer unit body 1 of the upper transformer unit and the lower transformer unit body 2 of the lower transformer unit are symmetrically arranged up and down, that is, the winding direction of the high and low voltage coils of the upper transformer unit is opposite to that of the lower transformer unit;

[0050] The epoxy resin low-voltage bushing of the upper transformer unit is located at the lower part of the upper transformer unit oil tank 10, and the epoxy resin low-voltage bushing of the lower transformer unit is located at the upper part of the lower transformer unit oil tank 11; in actual application, this technical means can reduce the height of the epoxy resin low-voltage bushing.

[0051] The high-voltage cable of the upper transformer unit is a high-voltage plug-in elbow-type bushing 3, which is arranged at the lower part of the side surface of the upper transformer unit body 1 in the width direction; the high-voltage cable of the lower transformer unit is a high-voltage plug-in elbow-type bushing 3, which is arranged at the upper part of the side surface of the lower transformer unit body 2 in the width direction; in actual application, this technical means can facilitate the access of two external cables and realize horizontal plug-in and pull-out operations.

[0052] The epoxy resin type low-voltage bushing pile heads 8 of the upper transformer unit are all arranged on the lower side of the upper transformer unit body 1, and the epoxy resin type low-voltage bushing pile heads 8 of the lower transformer unit are all arranged on the upper side of the lower transformer unit body 2; in actual applications, the epoxy resin type low-voltage bushing pile heads 8 are respectively arranged on the lower side of the corresponding upper transformer unit body 1 or the upper side of the corresponding lower transformer unit body 2, so that the low-voltage coils between the upper transformer unit and the lower transformer unit can be output separately or in parallel.

[0053] The low-voltage emergency power input sockets 5 of the upper transformer unit and the lower transformer unit are both arranged on the side of the corresponding upper transformer unit body 1 or the side of the corresponding lower transformer unit body 2, and are both connected to the corresponding epoxy resin type low-voltage bushing pile head 8 through the oil-immersed isolating switch 4.

[0054] When the upper transformer unit and the lower transformer unit of the present invention are in operation, the heat dissipation effect of the product is significantly reduced compared with the conventional operation mode. Because the upper transformer unit and the lower transformer unit are operated in parallel, the heat dissipation center is raised due to the upper and lower arrangement of the heat dissipation method, and the temperature rise effect is also reduced compared with the conventional arrangement method.

[0055] The upper transformer unit and the lower transformer unit are arranged in a vertical split manner to minimize the footprint.

[0056] The present invention can adjust the transformer inlet valve according to the operating load conditions to perform dual-circuit heat dissipation regulation. The upper transformer unit oil tank 10 and the lower transformer unit oil tank 11 are filled with two groups of transformer oil, which are shared by each other. When the products are interoperable, the heat dissipation efficiency of a single product can be improved, so that the product operating temperature rise is lower and the load loss is lower. At the same time, it can meet its outdoor operation function and make the transformer product in the prefabricated cabin substation have a lower box temperature rise level, less than 5K. The upper transformer unit oil tank 10 and the lower transformer unit oil tank 11 are both high-reliability structures, and the structural design can achieve low-noise operation. The upper transformer unit body 1 and the lower transformer unit body 2 adopt insulation and heat resistance grades of Class B or above. Make the product smaller and more compact. The operating load capacity is stronger. Improve the reliability of the dual-circuit special transformer for urban 10kV prefabricated cabin substations.

[0057] The high-voltage cables of the upper transformer unit and the lower transformer unit are both high-voltage plug-in elbow bushings 3 and are both connected from the side in the width direction of the corresponding upper transformer unit body 1 or lower transformer unit body 2, and are arranged symmetrically up and down to facilitate on-site operation.

[0058] In some embodiments, the upper portion of the upper transformer unit oil tank 10 of the upper transformer unit radiator 7 of the upper transformer unit and the upper portion of the lower transformer unit oil tank 11 of the lower transformer unit radiator 12 of the lower transformer unit are connected via a radiator upper connecting pipe 6;

[0059] The lower part of the upper transformer unit oil tank 10 of the upper transformer unit radiator 7 of the upper transformer unit and the lower part of the lower transformer unit oil tank 11 of the lower transformer unit radiator 12 of the lower transformer unit are connected through the radiator lower connecting pipe 9 .

[0060] In some embodiments, a vacuum butterfly valve is used between the radiator upper connecting pipe 6 and the upper transformer unit oil tank 10 to connect after the upper transformer unit and the lower transformer unit are in place;

[0061] A vacuum butterfly valve is used between the lower connecting pipe 9 of the radiator and the oil tank 11 of the lower transformer unit to connect after the upper transformer unit and the lower transformer unit are in place.

[0062] When the upper transformer unit and the lower transformer unit are operated in parallel, the vacuum butterfly valve and the corresponding radiator lower connecting pipe 9 and radiator upper connecting pipe 6 are all in the open state.

[0063] The present invention can be connected to each other by opening the vacuum butterfly valve, and the upper and lower symmetrical arrangements can form efficient integrated heat dissipation of transformer oil, reduce the temperature rise during product operation, and make the operating temperature rise of a single product lower. Improve the short-term load operation capacity of a single product. When two units are in operation, the operating temperature rise is also lower than that of conventional horizontally arranged transformers. At the same time, transformer oil can be quickly replaced. The power supply operation mode of the dual-circuit product is more flexible.

[0064] In some embodiments, the lower transformer unit oil tank 11 is a reinforced structure, and an assembled structure is adopted between the lower transformer unit radiator 12 .

[0065] In actual applications, since the pressure after the oil level is connected is different from that of conventional products, it is necessary to adopt a reinforced structural design, and an assembled structure is also used between the oil tank and the radiator to achieve different installation methods under different working conditions.

[0066] In some embodiments, the upper transformer unit oil tank 10 and the lower transformer unit oil tank 11 are both provided with a pressure relief valve and a guide port, and are connected to the accident oil pool through the pressure relief valve and the guide port.

[0067] In some embodiments, the low-voltage outputs of the upper transformer unit and the lower transformer unit can be connected in parallel to the low-voltage switch cabinet through the busbar to connect the epoxy resin type low-voltage bushing to the low-voltage switch cabinet or each can be independently connected to the two-way low-voltage switch cabinet through the busbar.

[0068] In practical applications, the above technical means can realize the control of the transformer low-voltage output operation mode between the upper transformer unit and the lower transformer unit according to the operating load conditions.

[0069] like Figures 5 to 7 As shown, in some embodiments, it also includes a factory-prefabricated cement foundation 13;

[0070] The factory-prefabricated cement foundation 13 includes an oil collection unit and a high-voltage cable inlet and outlet unit that are not interconnected;

[0071] The oil collection unit is located below the energy-efficient distribution transformer;

[0072] The high-voltage cable inlet and outlet unit is located below the high-voltage plug-in elbow bushing.

[0073] In actual application, when oil spray occurs in the high-efficiency distribution transformer, the oil collection unit of the factory-prefabricated cement foundation 13 becomes an emergency oil pool to prevent the emergency situation from affecting the surrounding environment.

[0074] In some embodiments, the vegetable oil is flame-retardant and has a high ignition point, and can reach a K-grade state; and the flash point of the vegetable oil is not less than 330°C.

[0075] In some embodiments, the upper transformer unit oil tank 10 and the lower transformer unit oil tank 11 are in communication.

[0076] In some embodiments, the epoxy resin low-voltage bushing pile head 8 is provided with a low-voltage emergency power input port of an isolating switch.

[0077] In practical applications, this technical means can realize emergency power supply after the fault.

[0078] In some embodiments, both the upper transformer unit and the lower transformer unit are primary energy efficiency transformers.

[0079] In some embodiments, it further includes a low voltage external emergency power input port;

[0080] The low-voltage external emergency power input port forms a break between the low-voltage isolating switch in the upper transformer unit oil tank 10 or the lower transformer unit oil tank 11 and the coil low-voltage outgoing busbar of the upper transformer unit or the lower transformer unit.

[0081] In practical applications, this technical means can achieve rapid external power supply when the normal power supply is disconnected.

[0082] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. Double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin substation; characterized in that: It includes an upper transformer unit and a lower transformer unit arranged vertically; The upper transformer unit oil tank (10) of the upper transformer unit and the lower transformer unit oil tank (11) of the lower transformer unit are vertically distributed; The upper transformer unit oil tank (10) and the lower transformer unit oil tank (11) are filled with transformer oil; The lower part of the upper transformer unit body (1) of the upper transformer unit and the lower transformer unit body (2) of the lower transformer unit are symmetrically arranged up and down, that is, the winding direction of the high and low voltage coils of the upper transformer unit is opposite to that of the lower transformer unit; The epoxy resin type low-voltage bushing of the upper transformer unit is located at the lower part of the upper transformer unit oil tank (10), and the epoxy resin type low-voltage bushing of the lower transformer unit is located at the upper part of the lower transformer unit oil tank (11); The high-voltage cable of the upper transformer unit is a high-voltage plug-in elbow-shaped bushing (3) which is arranged at the lower part of the side surface in the width direction of the upper transformer unit body (1); the high-voltage cable of the lower transformer unit is a high-voltage plug-in elbow-shaped bushing (3) which is arranged at the upper part of the side surface in the width direction of the lower transformer unit body (2); The epoxy resin type low-voltage bushing pile heads (8) of the upper transformer unit are all arranged on the lower side surface of the upper transformer unit body (1), and the epoxy resin type low-voltage bushing pile heads (8) of the lower transformer unit are all arranged on the upper side surface of the lower transformer unit body (2); The low-voltage emergency power input sockets (5) of the upper transformer unit and the lower transformer unit are both arranged on the side of the corresponding upper transformer unit body (1) or the side of the corresponding lower transformer unit body (2), and are both connected to the corresponding epoxy resin type low-voltage bushing pile head (8) through an oil-immersed isolating switch (4).

2. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1 is characterized in that: The upper part of the upper transformer unit oil tank (10) of the upper transformer unit radiator (7) of the upper transformer unit and the upper part of the lower transformer unit oil tank (11) of the lower transformer unit radiator (12) of the lower transformer unit are connected via a radiator upper connecting pipe (6); The lower part of the upper transformer unit oil tank (10) of the upper transformer unit radiator (7) of the upper transformer unit and the lower part of the lower transformer unit oil tank (11) of the lower transformer unit radiator (12) of the lower transformer unit are connected via a radiator lower connecting pipe (9).

3. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 2 is characterized in that: A vacuum butterfly valve is used between the radiator upper connecting pipe (6) and the upper transformer unit oil tank (10) to connect the upper transformer unit and the lower transformer unit after the upper transformer unit and the lower transformer unit are in place; The vacuum butterfly valve is used to connect the lower connecting pipe (9) of the radiator and the oil tank (11) of the lower transformer unit after the upper transformer unit and the lower transformer unit are in place.

4. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 2 is characterized in that: The lower transformer unit oil tank (11) is a reinforced structure, and an assembled structure is adopted between the lower transformer unit radiator (12).

5. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 2 is characterized in that: The upper transformer unit oil tank (10) and the lower transformer unit oil tank (11) are both provided with a pressure relief valve and a guide port, and are connected to an emergency oil pool via the pressure relief valve and the guide port.

6. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1 is characterized in that: The low-voltage outputs of the upper transformer unit and the lower transformer unit can be connected in parallel with the low-voltage switch cabinet through the busbar to make the epoxy resin type low-voltage bushing connected in parallel with the low-voltage switch cabinet, or can be independently connected with two low-voltage switch cabinets through the busbar.

7. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1 is characterized in that: It also includes factory-made prefabricated cement foundations (13); The factory-prefabricated cement foundation (13) includes an oil collection unit and a high-voltage cable inlet and outlet unit that are not interconnected; The oil collection unit is located below the high-efficiency distribution transformer; The high-voltage cable inlet and outlet unit is located below the high-voltage plug-in elbow bushing.

8. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1 is characterized in that: The vegetable oil is flame-retardant and has a high ignition point, and can reach K-grade status; and the flash point of the vegetable oil is not lower than 330°C.

9. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1 is characterized in that: The upper transformer unit oil tank (10) and the lower transformer unit oil tank (11) are in communication.

10. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1, characterized in that: The epoxy resin type low-voltage casing pile head (8) is provided with a low-voltage emergency power supply input port of an isolating switch.

11. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1, characterized in that: The upper transformer unit and the lower transformer unit are both first-level energy-efficient transformers.

12. The double-circuit vertical split high-efficiency distribution transformer for prefabricated cabin-type substation according to claim 1, characterized in that: It also includes a low voltage external emergency power input port; The low-voltage external emergency power supply input port forms a break between the low-voltage isolating switch in the upper transformer unit oil tank (10) or the lower transformer unit oil tank (11) and the coil low-voltage output busbar of the upper transformer unit or the lower transformer unit.

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