Hybrid distribution transformer structure

Abstract

The utility model discloses a kind of hybrid distribution transformer structures, it is related to transformer structure field, including oil tank, low voltage bushing group, high voltage bushing group, control bushing group, distribution box, power module;It further includes multiple current transformers, multiple current transformers are connected with low voltage bushing group, the current of low voltage bushing group can be collected in real time, and with distribution box, power module electric connection, compensation component is located on low voltage bushing group, and with distribution box, power module electric connection, integrated mounting rack group is located between oil tank one side and distribution box, power module;This kind of hybrid distribution transformer structure passes through integrated mounting rack group, can realize distribution box and power module in the same side installation of oil tank, improve wiring convenience, while can improve transformer overall structure integration, reduce occupied space, facilitate installation in the place of limited space.

Description

Technical Field

[0001] This utility model relates to the field of transformer structure, specifically a hybrid distribution transformer structure. Background Technology

[0002] Hybrid transformers are innovative transformers that combine traditional transformers with power electronics technology. They have powerful real-time stepless on-load voltage regulation capabilities, large voltage regulation range, and fast dynamic response. They also have functions such as reactive power compensation and harmonic suppression. They can effectively solve the problem of active voltage regulation in the "last mile" of the distribution network and can cope with power quality problems such as frequent voltage fluctuations and frequent voltage over-limits caused by distributed photovoltaic and electric vehicle access. At the same time, they can also have AC / DC hybrid power supply capabilities and refined power quality management.

[0003] However, existing hybrid distribution transformers have a loose structure and unreasonable component layout, resulting in a large overall size, occupying a lot of space, and making them inconvenient to install in places with limited space. Utility Model Content

[0004] The purpose of this utility model is to provide a hybrid distribution transformer structure. This hybrid distribution transformer structure, through the integrated mounting frame assembly, enables the distribution box and power module to be installed on the same side of the oil tank, improving wiring convenience. At the same time, it can improve the overall structural integration of the transformer, reduce the space occupied, and facilitate installation in places with limited space.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a hybrid distribution transformer structure, including an oil tank, a low-voltage bushing group, a high-voltage bushing group, a control bushing group, a distribution box, and a power module; It also includes multiple current transformers, which are connected to the low-voltage bushing group and can collect the current of the low-voltage bushing group in real time and output it to the distribution box. A compensation component is provided on the low-voltage bushing assembly and is electrically connected to the distribution box and the power module. An integrated mounting frame assembly is located on one side of the oil tank and between the power distribution box and the power module.

[0006] In some embodiments, the system further includes an integrated mounting bracket assembly, which includes two L-shaped rods symmetrically arranged on the top of the oil tank near the low-pressure bushing assembly, and the distribution box is mounted on the two L-shaped rods. A side mounting bracket is provided on one side of the oil tank near the low-pressure bushing assembly, and the power module is provided on the side mounting bracket.

[0007] In some embodiments, the integrated mounting bracket assembly further includes a connecting rod disposed between the two L-shaped rods and connected to the top of the compensation assembly.

[0008] In some embodiments, the integrated mounting bracket assembly further includes a mounting plate disposed on the top of the oil tank near the low-voltage bushing assembly, and the mounting plate is provided with a plurality of the current transformers.

[0009] In some embodiments, the low-voltage bushing group includes a plurality of low-voltage bushings, which are equally spaced between two L-shaped rods, and the current transformer is sleeved on the conductive rod of the low-voltage bushing.

[0010] In some embodiments, the compensation assembly includes a plurality of compensation copper busbars, the bottom of which is provided with a conductive rod through the low-voltage bushing, the top of which is connected to the connecting rod and electrically connected to the distribution box.

[0011] In some embodiments, a heat sink is also included, which is disposed on one side and both ends of the oil tank near the high-pressure bushing assembly.

[0012] In some embodiments, an oil temperature controller is also included. The oil temperature controller is located on the side of the oil tank near the high-voltage bushing assembly, and can monitor the oil temperature in the oil tank in real time and is electrically connected to the distribution box.

[0013] In summary, this utility model has the following beneficial effects: This utility model integrates the distribution box and power module on the same side by integrating the mounting frame assembly, achieving a reasonable layout and compact structure, reducing installation space requirements, simplifying wiring, reducing installation difficulty, and improving installation efficiency.

[0014] This invention enables the transformer to possess powerful real-time stepless on-load tap changer capability without the need for an on-load tap changer by setting a current transformer and a compensation copper busbar on the low-voltage bushing, and combining the collected electrical parameters such as voltage, current, power factor, and harmonics with the control windings inside the distribution box, power module, and transformer. The voltage changer has a large adjustment range, fast dynamic response, no electric arc during voltage adjustment, and does not pollute the transformer oil. At the same time, it realizes reactive power compensation and harmonic suppression functions.

[0015] This invention uses an oil surface temperature controller to monitor the transformer oil temperature in real time, ensuring the stable operation of the transformer. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a structural schematic diagram from another perspective of the present invention.

[0017] In the diagram: 1. Oil tank; 2. Low-pressure bushing assembly; 3. High-pressure bushing assembly; 4. Control bushing assembly; 5. Current transformer; 6. Compensation assembly; 7. Integrated mounting bracket assembly; 71. L-shaped rod; 72. Side mounting bracket; 73. Connecting rod; 74. Mounting plate; 8. Heat sink; 9. Oil temperature controller. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] refer to Figure 1-3A hybrid distribution transformer structure includes an oil tank 1, a low-voltage bushing group 2, a high-voltage bushing group 3, a control bushing group 4, a distribution box (not shown in the figure), a power module (not shown in the figure), multiple current transformers 5, a compensation component 6, and an integrated mounting frame group 7. The low-voltage bushing group 2 is located on one side of the top of the oil tank 1. The low-voltage bushing group 2 is internally connected to the low-voltage winding of the transformer's main transformer and externally connected to the user terminal, enabling the safe and reliable output of the stepped-down electrical energy from the transformer. The high-voltage bushing group 3 is located on the other side of the top of the oil tank 1. The high-voltage bushing group 3 includes multiple equally spaced high-voltage bushings, which connect the external high-voltage power grid to the internal high-voltage winding of the transformer, allowing external high-voltage electrical energy to be introduced into the transformer. The control bushing group 4 is located in the middle of the top of the oil tank 1. The control bushing group 4 includes multiple equally spaced control bushings, internally connected to the transformer's control winding and externally connected to the distribution box and power module via cables, used to regulate the low-voltage side output voltage and ensure stable output power quality. Multiple current transformers 5 are connected to the low-voltage bushing group 2, enabling real-time acquisition of the current in the low-voltage bushing group 2 and outputting it to the distribution box and power module. Combined with the acquired voltage, current, power factor, harmonics, and other electrical parameters, data support is provided for subsequent control. The current transformers 5 are outdoor type to adapt to the environmental requirements of outdoor power distribution scenarios. The compensation component 6 is located on the low-voltage bushing group 2, with one end connected to the conductive part of the low-voltage bushing group 2 and the other end electrically connected to the power module via a cable. Based on the control commands transmitted from the distribution box, it can inject the reactive power or harmonic current output from the power module into the low-voltage side circuit to offset reactive power deficits or suppress harmonics in the system. The power module (not shown in the figure) is installed on the side of the tank 1. It is electrically connected to the distribution box, control bushing group 4, and compensation component 6 via cables. Precise control signals or compensation energy can be generated according to the commands of the power module. Fine voltage regulation of the transformer is achieved through the control bushing group 4.

[0020] The integrated mounting bracket 7 is located on the side of the oil tank 1 near the low-voltage bushing group 2, and between the oil tank 1 and the distribution box and power module. It can integrate the distribution box and power module on the same side of the oil tank 1, shorten the wiring distance between the components, and reduce signal transmission loss and interference.

[0021] With the integrated design of the same side of the integrated mounting bracket group 7, the installation position of the distribution box and the power module is more compact, the wiring operation is more convenient, the installation efficiency is improved, and the later maintenance cost can be reduced. When the transformer is running, the current transformer 5 on the low-voltage bushing group 2 collects the power parameters in real time and transmits them to the distribution box and the power module. The power module analyzes the parameters. If the voltage deviates from the rated value or the power quality is abnormal, the power module will input the regulating voltage to the transformer through the control bushing group 4 to realize real-time stepless on-load voltage regulation. The compensation component 6 injects reactive power or suppresses harmonic current in a targeted manner, ultimately ensuring the stable operation of the transformer.

[0022] In some embodiments, the system also includes an integrated mounting bracket assembly 7, which includes two L-shaped rods 71. The two L-shaped rods 71 ​​are symmetrically arranged on the top of the oil tank 1 near the low-voltage bushing assembly 2, and a distribution box is provided on the two L-shaped rods 71. Side mounting bracket 72 is located on one side of the oil tank 1 near the low-pressure bushing assembly 2, and a power module is mounted on the side mounting bracket 72.

[0023] In some embodiments, the integrated mounting bracket group 7 includes two L-shaped rods 71 ​​and a side mounting bracket 72. The two L-shaped rods 71 ​​are symmetrically arranged on the top of the oil tank 1 near the low-voltage bushing group 2. The horizontal section of the bottom of the L-shaped rods 71 ​​can be fixed to the cover of the oil tank 1 with bolts, and the vertical section of the two L-shaped rods 71 ​​can be fixed to the distribution box with bolts to form a stable connection between the distribution box and the oil tank 1. The side mounting bracket 72 is fixed on the side of the oil tank 1 near the low-voltage bushing group 2. The side mounting bracket 72 may include two channel plates. The two channel plates can be fixed to the side of the oil tank 1 by welding. Two L-shaped plates are horizontally welded between the two channel plates. The power module can be installed on the side mounting bracket 72 with bolts. By installing the distribution box and the power module on the top and side of the same side of the oil tank 1 respectively, the same-side integrated layout of the two is achieved, shortening the wiring distance.

[0024] In some embodiments, the integrated mounting bracket 7 further includes a connecting rod 73, which is horizontally mounted between two L-shaped rods 71, and the bottom of the connecting rod 73 is fixedly connected to the top of the compensation component 6. On the one hand, the connecting rod 73 can enhance the structural stability of the two L-shaped rods 71 ​​and prevent the L-shaped rods 71 ​​from deforming due to the weight of the distribution box. On the other hand, the connecting rod 73 supports and fixes the compensation component 6, ensuring that the position of the compensation component 6 is fixed and preventing the compensation component 6 from shifting due to its own weight or external force, thus ensuring the reliability of its connection with the low-voltage bushing group 2.

[0025] In some embodiments, the integrated mounting bracket assembly 7 further includes a mounting plate 74, which is horizontally fixed to the top of the oil tank 1 near the low-voltage bushing assembly 2. A plurality of current transformers 5 are evenly arranged on the upper surface of the mounting plate 74. The mounting plate 74 provides an independent and flat mounting carrier for the current transformers 5, and the plurality of current transformers 5 are arranged in an orderly manner on the mounting plate 74, which facilitates precise docking with the corresponding bushings of the low-voltage bushing assembly 2.

[0026] In some embodiments, the low-voltage bushing group 2 includes multiple low-voltage bushings, which are equally spaced between two L-shaped rods 71, and each low-voltage bushing has a current transformer 5 mounted on its conductive rod. By arranging the low-voltage bushings at equal intervals, the electrical safety distance between each bushing can be ensured to avoid mutual interference, and the current transformer 5 can accurately correspond to each low-voltage bushing, ensuring that the current change of each low-voltage bushing can be independently and in real time collected, providing a stable hardware foundation for subsequent electrical parameter collection.

[0027] In some embodiments, the compensation component 6 includes multiple compensation copper busbars. The bottom of each compensation copper busbar is connected through a conductive rod of the corresponding low-voltage bushing to achieve a conductive connection with the low-voltage side circuit. The top of the compensation copper busbar is fixedly connected to the connecting rod 73 and is electrically connected to the power module and distribution box via a cable. The compensation copper busbar is made of highly conductive materials such as copper. The excellent conductivity of copper is used to improve the compensation efficiency. The connection between the bottom of the compensation copper busbar and the conductive rod of the low-voltage bushing can directly obtain the low-voltage side power signal. The electrical connection between the top and the distribution box can accurately transmit the compensation power to the low-voltage side. Real-time compensation is achieved in conjunction with the parameters collected by the current transformer 5. The fixed connection with the connecting rod 73 ensures that the compensation copper busbar is installed stably and avoids vibration during operation.

[0028] In some embodiments, the hybrid distribution transformer structure further includes heat sinks 8, which are respectively disposed on one side of the oil tank 1 near the high-voltage bushing group 3 and on both ends of the oil tank 1. During the operation of the transformer, the oil tank 1 will generate heat due to internal winding losses. By increasing the contact area between the oil tank 1 and the air, the heat sinks 8 can quickly conduct the heat inside the oil tank 1 to the external environment. Furthermore, by concentrating the heat sinks 8 on the side away from the low-voltage bushing group 2, it can avoid mutual interference between the heat sinks 8 and the low-voltage side components, and can also utilize the relatively open space on the high-voltage side to improve heat dissipation efficiency and ensure the stable temperature of the insulating oil inside the oil tank 1.

[0029] In some embodiments, the hybrid distribution transformer structure further includes an oil surface temperature controller 9, which is installed on the side of the oil tank 1 near the high-voltage bushing group 3 and electrically connected to the distribution box via a signal line. The probe end of the oil surface temperature controller 9 extends into the insulating oil in the oil tank 1, which can monitor the temperature change of the insulating oil in real time and convert the temperature data into an electrical signal and transmit it to the distribution box. When the oil temperature is detected to exceed the preset safety threshold, the control unit in the distribution box will immediately trigger the protection mechanism, such as starting the cooling equipment or disconnecting part of the load, to prevent the oil temperature from being too high, which could lead to the deterioration of the insulating oil or the burning of the windings, thus providing temperature safety assurance for the stable operation of the transformer.

[0030] The specific working principle is as follows: After the transformer is connected to the power system, current transformer 5 collects the current of each low-voltage bushing in real time, and transmits it along with the collected voltage, current, power factor, harmonics, and other electrical parameters to the distribution box and power module on the same side via cable. Upon receiving the relevant electrical parameters, the control unit within the power module immediately performs data analysis and status judgment: if a voltage deviation from the rated value is detected (such as grid voltage fluctuations), the power module generates a corresponding voltage regulation command, inputting a regulating voltage to the control winding within the transformer through the control bushing group 4, thereby changing the voltage of the main transformer's high-voltage winding to maintain a stable low-voltage output voltage. Based on power electronics technology, the power module quickly adjusts internal circuit parameters and indirectly intervenes in the transformer's core winding through the control bushing group 4, achieving real-time, smooth voltage load regulation.

[0031] When a low power factor (insufficient reactive power) or excessive harmonic content is detected, the power module will perform fine compensation on the system phase, current, and voltage through the compensation copper bus circuit to achieve reactive power compensation and harmonic suppression. During this process, the distribution box continuously receives the oil temperature signal transmitted by the oil temperature controller 9, and synchronously monitors the transformer's safety status to ensure that control commands and safety safeguards do not conflict. When the oil temperature exceeds the preset safety threshold (e.g., due to excessive load or insufficient heat dissipation), the distribution box immediately triggers the protection mechanism: on the one hand, it links with external cooling equipment to enhance heat dissipation; on the other hand, if the oil temperature continues to rise, it can disconnect some non-core loads to prevent insulation oil deterioration or winding burnout, ensuring long-term stable operation of the transformer.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hybrid distribution transformer structure, comprising an oil tank (1), a low-voltage bushing group (2), a high-voltage bushing group (3), a control bushing group (4), a distribution box, and a power module; Its features are: It also includes multiple current transformers (5), which are connected to the low-voltage bushing group (2) and can collect the current of the low-voltage bushing group (2) in real time and output it to the distribution box. Compensation component (6), the compensation component (6) is disposed on the low-voltage bushing group (2) and electrically connected to the distribution box and the power module; An integrated mounting bracket assembly (7) is located on one side of the oil tank (1) between the power distribution box and the power module.

2. The hybrid distribution transformer structure according to claim 1, characterized in that: The integrated mounting frame assembly (7) includes two L-shaped rods (71), which are symmetrically arranged on the top of the oil tank (1) near the low-pressure bushing assembly (2), and the distribution box is provided on the two L-shaped rods (71); Side mounting bracket (72) is located on one side of the oil tank (1) near the low-pressure bushing assembly (2), and the power module is mounted on the side mounting bracket (72).

3. The hybrid distribution transformer structure according to claim 2, characterized in that: The integrated mounting bracket assembly (7) also includes a connecting rod (73), which is located between the two L-shaped rods (71) and is connected to the top of the compensation component (6).

4. The hybrid distribution transformer structure according to claim 2, characterized in that: The integrated mounting frame assembly (7) also includes a mounting plate (74), which is located on the top of the oil tank (1) near the low-pressure bushing assembly (2), and the mounting plate (74) is provided with a plurality of current transformers (5).

5. The hybrid distribution transformer structure according to claim 3, characterized in that: The low-voltage bushing group (2) includes multiple low-voltage bushings, which are equally spaced between two L-shaped rods (71), and the current transformer (5) is sleeved on the conductive rod of the low-voltage bushing.

6. The hybrid distribution transformer structure according to claim 5, characterized in that: The compensation component (6) includes multiple compensation copper busbars, the bottom of which is provided with a conductive rod of the low-voltage bushing, the top of which is connected to the connecting rod (73) and electrically connected to the distribution box.

7. The hybrid distribution transformer structure according to claim 1, characterized in that: It also includes a heat sink (8), which is located on one side and both ends of the oil tank (1) near the high-pressure bushing assembly (3).

8. The hybrid distribution transformer structure according to claim 1, characterized in that: It also includes an oil temperature controller (9), which is located on the side of the oil tank (1) near the high-pressure bushing assembly (3), and can monitor the oil temperature in the oil tank (1) in real time and is electrically connected to the distribution box.

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