Compact low-voltage unit of photovoltaic box-type substation

Abstract

According to the compact low-voltage unit of the photovoltaic box-type transformer substation, the vertical bus is not provided with a special bus interval any more, so that the product volume can be effectively reduced; the fan is arranged at the lower part of the main cabinet, so that the heat dissipation capability of the product can be improved by utilizing the thermal expansion and cold contraction The upper rear side of the auxiliary cabinet is provided with a molded case circuit breaker, and the upper front side of the auxiliary cabinet is provided with a measurement and control device, so that the internal space of the cabinet body can be more effectively utilized; transparent insulating protection plates are arranged above and below the molded case circuit breaker, so that inspection is facilitated, and the safety protection requirement is met; the terminal box on the right side of the auxiliary cabinet is divided into three independent areas, the function division is clear, the operation is safe and reliable, the main buses are vertically arranged, the bus strength is improved, and the current-carrying capacity is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of box-type substations, in particular to a compact low-voltage unit of a photovoltaic box-type substation. Background Art

[0002] The compact low-voltage unit for photovoltaic is used to connect multiple photovoltaic inverters, collect and transmit them to the transformer. It is an AC distribution unit used to realize the output, monitoring, display and equipment protection of the inverter output power. The photovoltaic box transformer low-voltage cabinet provides an output interface for the inverter. The main equipment includes branch circuit molded case circuit breakers, main circuit frame circuit breakers, photovoltaic measurement and control protection devices, AC lightning protection devices and other instruments and equipment.

[0003] Existing photovoltaic low voltage units:

[0004] ① The vertical busbar needs to set up a busbar area between the main cabinet and the auxiliary cabinet, which increases the size of the cabinet;

[0005] ② The low-voltage unit has a large current and many types of components, which causes a lot of heat to be generated in the cabinet. The fan is installed on the left side of the cabinet, which not only increases the volume of the low-voltage unit, but also causes poor heat dissipation due to the obstruction of the circuit breaker interphase insulation board during ventilation;

[0006] ③ The upper and lower plastic shells of the low-voltage unit are arranged on the front side of the cabinet, resulting in the need for installation space for the measurement and control device and other instruments;

[0007] ④ The terminal box adopts an integral structure and does not distinguish between areas such as the miniature circuit breaker, secondary terminals, and primary components. This makes it easy to make mistakes during operation and maintenance, and poses a safety hazard. Utility Model Content

[0008] In order to solve the above technical problems, the utility model is a compact low-voltage unit for photovoltaic box-type substation, and its technical solution is:

[0009] It includes a cabinet body, which is composed of a main cabinet and a sub-cabinet. The main cabinet is arranged on one side of the sub-cabinet. A frame circuit breaker is arranged on the upper part of the main cabinet. The right side of the frame circuit breaker is a vertical busbar, which is on the right side of the main cabinet. A molded case circuit breaker, a lower busbar and a transparent insulating plate are arranged at the lower part of the main cabinet.

[0010] The upper rear side of the auxiliary cabinet is equipped with upper busbar, molded case circuit breaker and transparent insulation board, and the upper front side is equipped with measurement and control device;

[0011] A terminal box is set on the right side of the sub-cabinet, which is divided into three independent areas, namely the terminal box front plate, the terminal box upper plate, and the terminal box lower plate; the terminal box front plate is used to install miniature circuit breakers, the terminal box upper plate is used to install secondary terminals, and the terminal box lower plate is used to install surge protectors and fuse elements.

[0012] Furthermore, a source control terminal is installed inside the terminal box and connected to the 3-frame circuit breaker for realizing operation control.

[0013] Furthermore, a fan is provided at the bottom of the main cabinet frame circuit breaker and the lower busbar.

[0014] The beneficial effects of the utility model are as follows: the utility model is a compact low-voltage unit of a photovoltaic box-type substation. The vertical busbar no longer has a dedicated busbar interval, which can effectively reduce the product volume. A fan is arranged at the bottom of the main cabinet, which can make full use of the principle of thermal expansion and contraction to improve the heat dissipation capacity of the product. A molded case circuit breaker is arranged on the upper rear side of the auxiliary cabinet, and a measurement and control device is arranged on the upper front side, which can make full use of the internal space of the cabinet. The terminal box on the right side of the auxiliary cabinet is divided into three independent areas with clear functional divisions, and is safe and reliable during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 for Figure 1 Left view;

[0017] Figure 3 for Figure 1 Top view;

[0018] Figure 4 for Figure 1 AA section view;

[0019] Figure 5 for Figure 3 BB section view;

[0020] As shown in the figure, 1 is the main cabinet, 2 is the auxiliary cabinet, 3 is the frame circuit breaker, 4 is the vertical busbar, 5 is the transparent insulation board, 6 is the molded case circuit breaker, 7 is the measurement and control device, 8 is the front plate of the terminal box, 9 is the upper plate of the terminal box, 10 is the lower plate of the terminal box, 11 is the upper busbar, 12 is the lower busbar, 13 is the fan, 14 is the miniature circuit breaker, and 15 is the source control terminal. DETAILED DESCRIPTION

[0021] As shown in the figure, the utility model is a compact low-voltage unit of a photovoltaic box substation, including a cabinet body, which is composed of a main cabinet 1 and a sub-cabinet 2. The upper part of the main cabinet 1 is a frame circuit breaker 3, and the right side of the frame circuit breaker 3 is a vertical bus 4. The vertical bus is arranged on the right side of the main cabinet, and the upper part is connected to the upper bus 11, and the lower part is connected to the lower bus 12. The front side of the lower part of the main cabinet 1 is a molded case circuit breaker 6, and the upper and lower parts of the molded case circuit breaker 6 are transparent insulating plates 5. The lower side of the rear of the main cabinet 1 is a fan 13, and the fan 13 is arranged under the main cabinet frame circuit breaker 3 and the lower part of the lower bus 12.

[0022] The right side of the main cabinet 1 is the auxiliary cabinet 2. A molded case circuit breaker 6 is arranged on the upper rear side of the auxiliary cabinet 2. A measurement and control device 7 is arranged on the upper front side of the auxiliary cabinet 2. Transparent insulating plates 5 are arranged above and below the molded case circuit breaker 6.

[0023] A terminal box is arranged on the right side of the sub-cabinet 2, which is divided into three independent areas, namely a terminal box front panel 8, a terminal box upper panel 9, and a terminal box lower panel 10; the terminal box front panel 8 is used for installing miniature circuit breaker socket components and miniature circuit breakers 14, sockets, residual current operated circuit breakers, etc.; the terminal box upper panel 9 is used for installing secondary components such as secondary terminals and relays; the terminal box lower panel 10 is used for installing primary components such as surge protectors and fuses.

[0024] A source control terminal 15 is installed in the terminal box and is connected to the three frame circuit breakers respectively for realizing control management.

[0025] The utility model is a compact low-voltage unit of a photovoltaic box-type substation. The vertical busbar is no longer equipped with a dedicated busbar interval, which can effectively reduce the product volume; a fan is arranged at the lower part of the main cabinet, and the principle of thermal expansion and contraction can be utilized to improve the heat dissipation capacity of the product; a molded case circuit breaker is arranged on the upper rear side of the auxiliary cabinet, and a measurement and control device is arranged on the upper front side of the auxiliary cabinet, which can more effectively utilize the internal space of the cabinet; transparent insulating protective plates are arranged above and below the molded case circuit breaker, which is convenient for inspection and meets the safety protection requirements; the terminal box on the right side of the auxiliary cabinet is divided into three independent areas, with clear functional divisions and safe and reliable operation; the main busbars are arranged vertically, which not only improves the busbar strength but also increases the current carrying capacity.

[0026] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A compact low-voltage unit of a photovoltaic box-type substation includes a cabinet body, which is composed of a main cabinet and a sub-cabinet. The sub-cabinet is arranged on one side of the main cabinet, and is characterized in that: A frame circuit breaker is installed on the upper part of the main cabinet, and a vertical busbar is on the right side of the frame circuit breaker. The vertical busbar is on the right side of the main cabinet; a molded case circuit breaker, a lower busbar and a transparent insulating plate are installed on the lower part of the main cabinet; The upper rear side of the auxiliary cabinet is equipped with upper busbar, molded case circuit breaker and transparent insulation board, and the upper front side is equipped with measurement and control device; A terminal box is set on the right side of the sub-cabinet, which is divided into three independent areas, namely the terminal box front plate, the terminal box upper plate, and the terminal box lower plate; the terminal box front plate of the sub-cabinet is used to install the miniature circuit breaker, the terminal box upper plate is used to install the secondary terminals, and the terminal box lower plate is used to install the surge protector and fuse elements.

2. The compact low-voltage unit of a photovoltaic box-type substation according to claim 1, characterized in that: A source control terminal is installed inside the terminal box and connected to the 3-frame circuit breaker to achieve operation control.

3. The compact low-voltage unit of a photovoltaic box-type substation according to claim 1, characterized in that: A fan is also provided at the bottom of the main cabinet frame circuit breaker and the lower busbar.

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