American transformer for energy storage converter station and energy storage and conversion integrated transformer substation

Abstract

The utility model relates to the field of oil-immersed transformers in the technical field of power equipment, in particular to an American transformer for an energy storage converter station and an energy storage and conversion integrated substation, which comprise an oil tank, a transformer body, a tank cover, a high-voltage bushing, a low-voltage bushing, a control box, a no-load tap switch, a pressure relief valve and a low-voltage copper bar, the high-voltage bushing is arranged at the front part of the transformer body and connected with the transformer body, the low-voltage bushing and the low-voltage copper bar are arranged at the lower part of the transformer body and connected with the transformer body, the control box is arranged at the upper part of the oil tank, the tank cover hermetically covers the oil tank, the pressure relief valve is arranged at the top of the tank cover, and the no-load tap-changer is arranged below the transformer body and connected with the transformer body. In order to better match with the inverter, the low-voltage bushing connected with the transformer body is led out from the bottom of the right side wall of the oil tank, and the height of the led-out wire is consistent with that of an interface of the inverter, so that the use amount of copper bars can be greatly reduced, and the manufacturing cost of the transformer is reduced.

Description

Technical Field

[0001] The utility model relates to the field of oil-immersed transformers in the technical field of electric power equipment, and in particular to an American-style transformer for an energy storage converter station and an energy storage converter integrated transformer station. Background Art

[0002] Substation refers to the place in the power system where voltage and current are transformed, electric energy is received and distributed. The electrical equipment in the substation is divided into primary equipment and secondary equipment. Primary equipment refers to equipment that directly produces, transmits, distributes and uses electric energy, mainly including transformers, high-voltage circuit breakers, disconnectors, busbars, lightning arresters, capacitors, reactors, etc. The secondary equipment of the substation refers to equipment that measures, monitors, controls and protects the operating conditions of the primary equipment and system. It mainly consists of relay protection devices, automatic devices, measurement and control devices, metering devices, automation systems and DC equipment that provides power for secondary equipment.

[0003] American transformers are suitable for commercial centers, industrial parks, residential areas and other places. They can be installed in load centers for ring network and two-way power supply, and can realize power transmission in one installation. They have the characteristics of full insulation, full sealing structure, maintenance-free and easy installation.

[0004] With the continuous development of new energy storage technology, the market has more and more demands for energy storage and conversion integrated substations, and correspondingly puts forward higher requirements for its quality performance, construction cost and convenience of operation and maintenance. As an important part of the energy storage and conversion integrated substation, the structure and appearance design of the transformer needs to adapt to the operating characteristics of the conversion station and fully consider the layout of each functional compartment. The existing new energy American transformer structure can no longer meet the demand, and it is urgent to develop a new American transformer for the energy storage and conversion integrated substation.

[0005] Therefore, technicians in the field are in urgent need of an American transformer with a highly integrated structure and a reasonable functional layout that can solve the problems of existing American transformers such as scattered operation and maintenance equipment components, inconvenient operation, large footprint, and non-compact structure. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide an American-style transformer with a modular design to reduce the footprint of a substation, fully consider ergonomics to make the routine operation, maintenance and overhaul of the American-style transformer more convenient, and make the structure of the substation more reasonable to meet the needs of long-distance transportation.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an American-style transformer for an energy storage converter station, comprising an oil tank, a body, a box cover, a high-voltage bushing, a low-voltage bushing, a control box, a no-load tap changer, a pressure relief valve, and a low-voltage copper busbar. The body is placed inside the oil tank, the high-voltage bushing is arranged at the front of the body and connected to the body, the low-voltage bushing and the low-voltage copper busbar are arranged at the bottom of the body and connected to the body, the control box is arranged at the upper part of the oil tank, the box cover sealing cover is on the oil tank, the pressure relief valve is arranged on the top of the box cover, and the no-load tap changer is arranged at the bottom of the body and connected to the body.

[0008] The above-mentioned American transformer for energy storage converter station has a control box integrated with fuses, load switches, temperature controllers, pressure gauges, oil level gauges, oil filling valves, and air release valves. The control box and high-voltage bushing are arranged on the upper part of the oil tank, and the fuses and load switches are arranged below the high-voltage bushing. The fuses, load switches, and high-voltage bushings are arranged alternately left and right and up and down in the internal space of the oil tank.

[0009] In the above-mentioned American-style transformer for energy storage converter station, the low-voltage copper busbar leads out downward, and the height of the lead out is consistent with the height of the low-voltage bushing and the inverter interface.

[0010] The above-mentioned American-style transformer for energy storage converter station is also provided with an oil filter valve on the box cover.

[0011] The above-mentioned American-style transformer for energy storage converter station is also provided with a desiccant above the box cover for suppressing the generation of hydrogen in the oil tank.

[0012] The above-mentioned American-style transformer for energy storage converter station is also provided with an oil drain valve for taking oil samples and unloading oil under the oil tank.

[0013] The above-mentioned American-style transformer for energy storage converter station has a heat dissipation structure provided on the rear wall of the oil tank.

[0014] The above-mentioned American transformer for energy storage converter station, the sheet-dispersed structure includes a sheet-dispersed transfer box, a sheet-dispersed bracket, and a sheet-dispersed. Two sheet-dispersed transfer boxes are arranged on the oil tank. The sheet-dispersed bracket is welded to the lower part of the sheet-dispersed and fixed on the base of the converter station. The sheet-dispersed is fixed on the wall of the American transformer box.

[0015] A energy storage and conversion integrated substation includes an inverter, a lead bridge, a high-voltage chamber, a low-voltage cabinet, and an auxiliary transformer, and also includes any of the above-mentioned American transformers for energy storage conversion stations, wherein the high-voltage chamber is connected to the device body through the high-voltage bushing, the lead bridge is connected to the inverter interface, the inverter is connected to the lead bridge, and the low-voltage cabinet and the auxiliary transformer are connected to the high-voltage chamber.

[0016] The above-mentioned integrated energy storage and current conversion substation also includes an operation and maintenance work area, and the control box is arranged in front of the operation and maintenance work area.

[0017] The beneficial effects of the utility model, an American-style transformer for energy storage conversion station and an integrated energy storage conversion substation, are as follows: in order to better cooperate with the inverter, the low-voltage bushing connected to the body of the transformer is led out from the bottom of the right side wall of the oil tank, and the height of the lead-out line is consistent with the height of the inverter interface, which can greatly reduce the amount of copper busbars and reduce the manufacturing cost of the transformer. The control box is located on the left side wall of the oil tank outside the body of the transformer, and the fuse, load switch, temperature controller, pressure gauge, oil level gauge, oil filling valve and air release valve are integrated inside. Compared with the previous control box structure, the layout is more reasonable and compact. There are tap changers, oil drain valves and oil sample valves under the control box. All equipment components that need to be operated are located on the left side wall of the transformer. Similarly, the left side of the transformer is the working area, which has a large space and is convenient for operators to operate. The American-type transformer adopts a new structure. The entire converter station occupies a smaller area and has a more compact structure. The equipment components that need to be operated on the American-type transformer are arranged on the left side of the transformer. The working area is wide, which is convenient for operators to work. The component positions are arranged reasonably, the internal insulation distance is increased, and the risk of internal discharge in the transformer is reduced. The air gap is increased and a desiccant is configured to suppress the generation of hydrogen, ensuring the reliable and stable operation of the American-type transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the front view of the American-style transformer structure of the utility model;

[0019] Figure 2 This is a side view of the American-style transformer structure of the utility model;

[0020] Figure 3 This is a top view of the converter station structure of the utility model.

[0021] Explanation of the reference numerals in the accompanying drawings: high-voltage bushing 1, low-voltage bushing 2, sheet-type transformer 3, sheet-type transformer bracket 4, sheet-type transformer adapter box 5, control box 6, air bleed valve 7, pressure gauge 8, oil filling valve 9, oil level gauge 10, temperature controller 11, load switch 12, fuse 13, oil tank 14, device body 15, pressure relief valve 16, desiccant 17, oil filter valve 18, no-load tap changer 19, oil drain valve 20, low-voltage copper bus 21, inverter 22, lead bridge 23, high-voltage chamber 24, low-voltage cabinet 25, auxiliary transformer 26, operation and maintenance work area 27. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is described below in conjunction with specific implementation methods and drawings.

[0023] Example 1

[0024] like Figure 1-2 As shown, an American-style transformer for an energy storage converter station includes a high-voltage bushing 1, a low-voltage bushing 2, a control box 6, an oil tank 14, a body 15, a box cover, an off-load tap changer 19, a pressure relief valve 16, an inverter interface, and a low-voltage copper bus 21. The body is placed inside the oil tank, and the high-voltage lead is led to the outside of the oil tank through the high-voltage bushing 1, and the high-voltage bushing is arranged above the front panel of the oil tank outside the body. The low-voltage copper bus 21 of the body is led to the outside of the oil tank through the low-voltage bushing 2, and the low-voltage bushing is located below the right side wall of the oil tank outside the body. The control box is arranged at the upper part of the oil tank to protect the internal integrated components. The box cover is sealed on the oil tank, and the pressure relief valve is arranged on the top of the box cover. The off-load tap changer is arranged below the body and connected to the body. The off-load tap changer uses a strip-shaped off-load tap changer, which is located below the control box on the left side wall of the transformer to adjust the voltage. The pressure relief valve can release the internal pressure of the oil tank to ensure the safe and stable operation of the transformer.

[0025] The control box is set on the left wall of the American transformer. The control box is integrated with a vent valve 7, a pressure gauge 8, an oil filling valve 9, an oil level gauge 10, a temperature controller 11, a load switch 12, and a fuse 13. The vent valve can be operated to maintain the pressure balance inside and outside the oil tank. The pressure gauge can monitor the internal pressure of the oil tank in real time. The oil filling valve can be used to fill the transformer to maintain the oil level and ensure the safe and stable operation of the transformer. The oil level gauge can monitor the oil level in real time. The temperature controller can monitor the internal temperature of the transformer in real time. The load switch plays the role of breaking the transformer load. When the transformer current exceeds a certain value, the fuse will melt to prevent other equipment from burning. The control box and the high-voltage bushing are set on the upper part of the oil tank, and the fuse and the load switch are set below the high-voltage bushing. The fuse, the load switch, and the high-voltage bushing are arranged in a left-right and up-down staggered manner in the internal space of the oil tank. The fuse, the load switch, and the high-voltage bushing are located on the upper oil tank of the body. By staggering the fuses, load switches and high-voltage bushings up and down and left and right in space, the internal space of the oil tank is fully utilized. The layout positions of the fuses, load switches and high-voltage bushings make the insulation distance between them sufficiently large, and the lead paths of the device body are short and non-crossed, which greatly reduces the risk of discharge inside the oil tank.

[0026] The low-voltage copper busbar leads out downwards, and the height of the lead is basically consistent with the height of the low-voltage bushing and the inverter interface, which reduces the use of the copper busbar and reduces the manufacturing cost of the transformer.

[0027] An oil filter valve 18 is also provided on the box cover.

[0028] A desiccant 17 for suppressing the generation of hydrogen in the oil tank is also provided above the box cover. The desiccant and the pressure relief valve are both arranged on the left side of the box cover for easy operation, observation and maintenance. By increasing the air gap, configuring a desiccant and other measures, the generation of hydrogen is suppressed to ensure the reliable and stable operation of the American transformer.

[0029] An oil drain valve 20 for taking oil samples and unloading oil is also provided under the oil tank. The oil drain valve can use an emergency oil drain valve and an oil sample valve. The emergency oil drain valve and the oil sample valve are located below the left side wall of the transformer to facilitate operations such as taking oil samples and unloading oil.

[0030] The rear wall of the oil tank is equipped with a heat dissipation structure. The heat dissipation structure takes full account of the operating conditions of the transformer station, strictly controls the temperature rise in the design, and reduces the number of heat dissipation groups by increasing the number of heat dissipation groups, thereby reducing the size of the American transformer, making its structure more compact and convenient for transportation.

[0031] The sheet-dispersed structure includes a sheet-dispersed plate 3, a sheet-dispersed plate bracket 4, and a sheet-dispersed plate transfer box 5. Two sheet-dispersed plate transfer boxes are arranged on the oil tank. The sheet-dispersed plate bracket is welded to the lower part of the sheet-dispersed plate and fixed on the base of the converter station. The sheet-dispersed plate is fixed on the wall of the American transformer box.

[0032] Example 2

[0033] The similarities between this embodiment and embodiment 1 are not described in detail, and the difference between them is that:

[0034] like Figure 3 As shown, a type of integrated energy storage and current conversion substation includes an inverter 22, a lead bridge 23, a high-voltage chamber 24, a low-voltage cabinet 25, and an auxiliary transformer 26. The above structure is a common structure of a substation. The difference from the existing substation is that it also includes an American transformer as described in Example 1. The high-voltage chamber is connected to the body of the transformer through a high-voltage bushing, the lead bridge is connected to the inverter interface, the inverter is connected to the lead bridge, and the low-voltage cabinet and the auxiliary transformer are connected to the high-voltage chamber.

[0035] The high-voltage bushing is located above the front panel of the transformer and the low-voltage bushing is located below the right wall of the transformer, which is conducive to the layout of the high-voltage room, inverter, etc. of the converter station, fully utilizing the space of the converter station, reducing the floor space and reducing the construction cost.

[0036] Furthermore, in order to facilitate operation and improve human-machine efficiency, the substation also includes an operation and maintenance operation area 27, and a control box is arranged in front of the operation and maintenance operation area.

[0037] The scattered plate bracket can be fixed through the base of the converter station, which can effectively reduce the risk of oil leakage at the scattered plate when the converter station is transported over long distances and experiences severe bumps.

[0038] The American-type transformer adopts a new structure. The entire converter station occupies a smaller area and has a more compact structure. The equipment components that need to be operated on the American-type transformer are all arranged on the left side of the transformer. The working area is wide, which is convenient for operators to operate. The transformer components are reasonably arranged to increase the internal insulation distance of the transformer and reduce the risk of internal discharge of the transformer. The air gap is increased and a desiccant is configured to suppress the generation of hydrogen, ensuring the reliable and stable operation of the American-type transformer. The amount of copper busbars is reduced, reducing the manufacturing cost of the transformer.

[0039] The shape of the transformer takes full account of ergonomics. The upper left position of the converter station top view is the operator's work area. Daily operation, maintenance and inspection of American transformers can be carried out in this area, which greatly facilitates the operators.

[0040] The above embodiments are only for illustrating the structural concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. An American-style transformer for energy storage converter station, characterized in that: The utility model comprises an oil tank, a device body, a box cover, a high-pressure bushing, a low-pressure bushing, a control box, a no-load tap changer, a pressure relief valve, and a low-pressure copper busbar. The device body is placed inside the oil tank, the high-pressure bushing is arranged at the front of the device body and connected to the device body, the low-pressure bushing and the low-pressure copper busbar are arranged at the bottom of the device body and connected to the device body, the control box is arranged at the upper part of the oil tank, the box cover sealing cover is on the oil tank, the pressure relief valve is arranged on the top of the box cover, and the no-load tap changer is arranged at the bottom of the device body and connected to the device body.

2. The American-style transformer for energy storage converter station according to claim 1 is characterized in that: The control box is integrated with a fuse, a load switch, a temperature controller, a pressure gauge, an oil level gauge, an oil filling valve, and an air release valve. The control box and the high-voltage bushing are arranged on the upper part of the oil tank, and the fuse and the load switch are arranged below the high-voltage bushing. The fuse, the load switch, and the high-voltage bushing are arranged alternately left and right and up and down in the internal space of the oil tank.

3. The American-style transformer for energy storage converter station according to claim 2 is characterized in that: The low-voltage copper busbar leads out downward, and the height of the lead out is consistent with the height of the low-voltage bushing and the inverter interface.

4. The American-style transformer for energy storage converter station according to claim 3 is characterized in that: The box cover is also provided with an oil filter valve.

5. The American-style transformer for energy storage converter station according to claim 4 is characterized in that: A desiccant for suppressing the generation of hydrogen in the fuel tank is also provided above the tank cover.

6. The American-style transformer for energy storage converter station according to claim 5, characterized in that: An oil drain valve for taking oil samples and unloading oil is also arranged below the oil tank.

7. The American-style transformer for energy storage converter station according to any one of claims 1 to 6, characterized in that: A heat dissipation structure is provided on the rear wall of the oil tank.

8. The American-style transformer for energy storage converter station according to claim 7 is characterized in that: The sheet-dispersed structure includes a sheet-dispersed transfer box, a sheet-dispersed bracket, and a sheet-dispersed. Two sheet-dispersed transfer boxes are arranged on the oil tank. The sheet-dispersed bracket is welded to the lower part of the sheet-dispersed and fixed on the base of the converter station. The sheet-dispersed is fixed on the wall of the American transformer box.

9. An integrated energy storage and current conversion substation, comprising an inverter, a lead bridge, a high voltage chamber, a low voltage cabinet, and an auxiliary transformer, characterized in that: It also includes an American-style transformer for an energy storage converter station as described in any one of claims 1 to 8, wherein the high-voltage chamber is connected to the device body through the high-voltage bushing, the lead bridge is connected to the inverter interface, the inverter is connected to the lead bridge, and the low-voltage cabinet and the auxiliary transformer are connected to the high-voltage chamber.

10. The integrated energy storage and current conversion substation according to claim 9, characterized in that: It also includes an operation and maintenance work area, and the control box is arranged in front of the operation and maintenance work area.

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