New large capacity box transformer low voltage cabinet

Abstract

The utility model discloses a novel large capacity box transformer low voltage cabinet, it includes fixedly connected together's A cabinet, B cabinet, C cabinet, A cabinet, B cabinet symmetrically set up in C cabinet both sides, A cabinet, B cabinet all are provided with frame circuit breaker and the plastic shell circuit breaker, and frame circuit breaker is with plastic shell circuit breaker constitutes the primary loop of low voltage cabinet, C cabinet sets up in the middle, is used to A cabinet, B cabinet and transformer's connecting chamber, and the control device is installed in C cabinet top, and the control device below is provided with the flexible connection, and the flexible connection and control device are separated through the protection seal plate, the utility model provides a new low voltage cabinet electrical device's layout structure, and installs the control device of former A cabinet secondary room on C cabinet flexible connection top, and the A cabinet secondary room that vacates can leave the installation space for the frame circuit breaker of greater shell frame current, improves the space utilization of whole box transformer, and expansion is convenient.

Description

Technical Field

[0001] This utility model relates to the field of box-type transformer equipment, specifically a new type of large-capacity box-type low-voltage switchgear. Background Technology

[0002] With the rapid development of new energy power generation, transformers, as an indispensable part of the power system, are playing an increasingly important role in the development of new energy fields. The capacity of new energy transformer substations is also constantly increasing, which in turn leads to an increase in transformer capacity and a continuous increase in the rated current on the low-voltage side. This requires low-voltage circuit breakers to have a larger frame current to adapt to the increased frame current, which also means a larger size and requires more space. Traditionally, the primary circuit components and secondary circuit components of low-voltage switchgear are placed in the same cabinet, and the structural layout cannot meet the expansion requirements. Therefore, it is necessary to optimize and improve the low-voltage switchgear. Utility Model Content

[0003] This utility model provides a new type of large-capacity prefabricated low-voltage switchgear with a more reasonable structural design, optimized component layout, and more rational use of the limited low-voltage space, freeing up more space for low-voltage circuit breakers to meet expansion needs.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A new type of large-capacity prefabricated low-voltage switchgear includes three cabinets, A, B, and C, which are fixedly connected together. Cabinets A and B are symmetrically arranged back-to-back on both sides of cabinet C. Each of cabinets A and B is equipped with a frame circuit breaker and a molded case circuit breaker. The frame circuit breaker and the molded case circuit breaker together form the primary circuit of the low-voltage switchgear. Cabinet C is located in the middle and serves as a chamber for connecting cabinets A and B to the transformer. The monitoring and control device is installed at the top inside cabinet C, and a flexible connection is provided below the monitoring and control device. The flexible connection and the monitoring and control device are separated by a protective sealing plate.

[0006] Cabinet C mainly serves to connect the primary side of cabinets A and B to the transformer. Some molded case circuit breakers are arranged at its lower end to expand the number of circuits of the subordinate branches of the frame circuit breakers in cabinets A and B.

[0007] Furthermore, the frame circuit breaker is installed on the upper part of cabinet A or cabinet B, with a mounting beam above it for mounting terminal blocks and fuses. A mounting rail is installed on one side of the frame circuit breaker for mounting miniature circuit breakers, residual current devices, and sockets. The molded case circuit breaker is installed below the frame circuit breaker.

[0008] The A and B cabinets are also equipped with primary protection devices such as surge protectors and fuses, and secondary protection devices such as miniature circuit breakers and residual current devices.

[0009] The A or B cabinet is equipped with an auxiliary dry-type transformer, which can convert the primary high voltage into 400V three-phase power for power supply to the measurement and control device and miniature circuit breaker.

[0010] The monitoring and control device is installed at the top of cabinet C, which shortens the distance between it and the circuit breaker in cabinet B, reduces the length of the line connection, and thus reduces the risk of external factors affecting the accuracy of signal transmission.

[0011] The C cabinet is equipped with ventilation holes on its top and cooling fans on its walls.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a new layout structure for low-voltage switchgear electrical components. The measurement and control device, which was originally located in the secondary compartment of cabinet A, is installed above the flexible connection of cabinet C. The freed-up secondary compartment of cabinet A can provide installation space for frame circuit breakers with larger frame current, thereby improving the overall space utilization of the transformer substation and facilitating capacity expansion. At the same time, placing the measurement and control device above cabinet C can decouple it from cabinets A and B. The construction of cabinets A and B or the construction of the measurement and control device will no longer interfere with each other and can be carried out simultaneously, improving construction efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] Figure 2 This is a top view of an embodiment of the present utility model;

[0015] Figure 3 This is a schematic diagram of the layout inside cabinet A;

[0016] 1. Cabinet A, 2. Cabinet B, 3. Cabinet C, 4. Measurement and control device, 5. Frame circuit breaker, 6. Molded case circuit breaker, 7. Mounting beam, 8. Mounting rail, 31-Cooling fan. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] As attached Figure 1-3The diagram illustrates a novel high-capacity prefabricated low-voltage switchgear, comprising three fixedly connected units: A1, B2, and C3. Units A1 and B2 are symmetrically positioned back-to-back on either side of unit C3, with their doors facing opposite directions. Each unit contains a frame circuit breaker 5 and a molded case circuit breaker 6, forming the primary circuit of the low-voltage switchgear. Unit C3, located in the middle, serves as the connection chamber between units A1 and B2 and the transformer. A monitoring and control device 4 is installed at the top of unit C3, with a flexible connection below it. The flexible connection and the monitoring and control device 4 are separated by a protective sealing plate. Since the monitoring and control device 4 is a secondary device (220V), and the original flexible connection between unit C3 and the transformer is a primary device (800V), a protective sealing plate is added to the flexible connection of unit C3 to protect the secondary device and meet the protection requirements of the low-voltage switchgear (Form 2b). This separates the secondary device from the primary device while maintaining adequate insulation distance, thus providing protection.

[0019] Cabinet C3 mainly serves to connect the primary side of cabinets A1 and B2 to the transformer. At its lower end, some molded case circuit breakers 6 are arranged to expand the number of circuits of the subordinate branches of the frame circuit breakers 5 of cabinets A1 and B2.

[0020] Furthermore, the frame circuit breaker 5 is installed on the upper part of cabinet A 1 or cabinet B 2, and a mounting beam 7 is installed above it to install terminal blocks and fuses. A mounting rail 8 is installed on one side of the frame circuit breaker 5 for installing miniature circuit breakers, residual current devices, and sockets. The molded case circuit breaker 6 is installed below the frame circuit breaker 5.

[0021] The cabinets A1 and B2 are also equipped with primary protection devices such as surge protectors and fuses, and secondary protection devices such as miniature circuit breakers and residual current devices.

[0022] The A cabinet 1 or B cabinet 2 is equipped with an auxiliary dry-type transformer, which can convert the primary high voltage into 400V three-phase electricity for power supply to the measurement and control device 4 and the miniature circuit breaker.

[0023] The measurement and control device 4 is installed at the top of cabinet C 3, which shortens the distance between it and the frame circuit breaker 5 of cabinet B 2, reduces the length of the line connection, and thus reduces the risk of external factors affecting the accuracy of signal transmission.

[0024] The top of cabinet C3 is equipped with heat dissipation holes, and the cabinet wall of cabinet C3 is equipped with a heat dissipation fan 31, which effectively reduces the temperature rise of cabinet C.

[0025] Traditional small-capacity frame circuit breakers are relatively small, leaving space in the primary cabinet for secondary devices. However, in this embodiment, the monitoring and control devices, originally located in the secondary compartment of cabinet A, are installed above the flexible connection in cabinet C. This frees up the secondary compartment of cabinet A to provide installation space for frame circuit breakers with larger frame currents, improving the overall space utilization of the transformer substation and facilitating layout optimization. At the same time, placing the monitoring and control devices above cabinet C decouples them from cabinets A and B. Construction of cabinets A and B individually or of the monitoring and control devices will no longer interfere with each other and can be carried out simultaneously, improving construction efficiency.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model. These improvements should also be considered within the scope of protection of the present utility model without creative effort.

Claims

1. A new type of large capacity box transformer low voltage cabinet, characterized by: It includes cabinets A, B, and C, which are fixedly connected together. Cabinets A and B are symmetrically arranged back-to-back on both sides of cabinet C. Cabinets A and B are equipped with frame circuit breakers and molded case circuit breakers. The frame circuit breakers and molded case circuit breakers form the primary circuit of the low-voltage cabinet. Cabinet C is located in the middle and is used as a chamber for connecting cabinets A and B to the transformer. The monitoring and control device is installed at the top inside cabinet C. A flexible connection is set below the monitoring and control device. The flexible connection and the monitoring and control device are separated by a protective sealing plate.

2. The novel high-capacity box-type low voltage switchgear according to claim 1, characterized in that: The lower part of cabinet C is equipped with molded case circuit breakers to expand the number of circuits in the branches of the frame circuit breakers in cabinets A and B.

3. The novel large-capacity prefabricated low-voltage switchgear according to claim 1, characterized in that: The frame circuit breaker is installed on the upper part of cabinet A or cabinet B. A mounting beam is installed above it to install terminal blocks and fuses. A mounting rail is installed on one side of the frame circuit breaker for installing miniature circuit breakers, residual current devices, and sockets. Molded case circuit breakers are installed below the frame circuit breaker.

4. The novel large-capacity prefabricated low-voltage switchgear according to claim 1, characterized in that: The A and B cabinets are equipped with surge protectors, which are primary protection devices.

5. The novel large-capacity prefabricated low-voltage switchgear according to claim 1, characterized in that: An auxiliary dry-type transformer is installed in either cabinet A or cabinet B.

6. The novel large-capacity prefabricated low-voltage switchgear according to claim 1, characterized in that: The C cabinet is equipped with ventilation holes on its top and cooling fans on its walls.

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