New energy box transformer compact type air insulation switch cabinet

Abstract

The utility model discloses a compact air-insulated switch cabinet for a new energy box transformer substation, which is suitable for a prefabricated substation with the voltage class of 10kV and comprises a single cabinet body, an instrument door, a circuit breaker chamber door and a cable chamber door are sequentially arranged on the cabinet body from top to bottom, a mounting cross beam is arranged in the cabinet body, a voltage transformer is mounted above the cabinet body, a 10KV circuit breaker is mounted in the middle of the cabinet body, and a high-voltage transformer is mounted in the middle of the cabinet body. Wherein an insulating plate is arranged in the middle of the cabinet body, a lightning arrester is arranged below the circuit breaker, the wire outlet end of the circuit breaker is connected with a current transformer, a copper bar outlet is formed in the right side of the upper end of the cabinet body and used for leading out a copper bar, the circuit breaker chamber door is provided with an operation hole, a live display and an observation window, and the cable chamber door is provided with an electromagnetic lock and a counter. The switch cabinet is reasonable in structural layout, a high-voltage protection module which is compact in structure, economical and practical is provided for a new energy box transformer substation, the high-voltage protection module, a transformer and low-voltage switch equipment jointly form a set of transformation equipment, the overall size of the box transformer substation is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to a compact air-insulated switchgear for new energy transformer substations, which is applicable to the field of 10kV new energy transformer substation power generation. Background Technology

[0002] With the rapid development of the new energy industry, the capacity of wind and solar power transformer substations is gradually increasing, and the range of capacity selection is becoming wider, leading to more diverse requirements for the high-voltage side distribution equipment. In 10kV new energy transformer substation systems, the switch protection configurations used on the high-voltage side vary more depending on the substation capacity: load switch fuse combination electrical appliances with surge arresters, combined vacuum circuit breakers with current transformers and surge arresters, vacuum circuit breakers with isolating grounding switches, current transformers, surge arresters, etc. The corresponding switchgear types are also different, adding trouble to the later switchgear design and production process, and causing certain difficulties in assembling with the transformer substation, leading to a series of problems. In addition, the transformer substation market is becoming increasingly competitive, with the industry striving to reduce costs as much as possible while ensuring quality. In the past, there were various types of switchgear, usually double-cabinet and triple-cabinet styles, with large cabinet sizes and serious waste of internal space. The volume of the switchgear directly affects the overall volume of the transformer substation; the larger the switchgear, the larger the transformer substation enclosure, and the more serious the waste of space on the high-voltage side of the transformer substation. This increases the manufacturing cost of the transformer substation and indirectly affects the land area occupied at the project site. Utility Model Content

[0003] This utility model provides a compact air-insulated switchgear for 10kV new energy transformer substations, which has a compact and reasonable structural design, reduces space occupation, and lowers production costs.

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

[0005] A compact air-insulated switchgear for new energy transformer substations includes a single cabinet. From top to bottom, the front of the cabinet has an instrument door, a circuit breaker compartment door, and a cable compartment door. Inside the cabinet, there are mounting beams for installing electrical components. A voltage transformer is installed at the top of the cabinet, and a 10kV circuit breaker is installed in the middle, with an insulating plate in the middle. A surge arrester is installed below the circuit breaker, and a current transformer is connected to the outgoing terminals of the circuit breaker. A copper busbar outlet is located on the upper right side of the cabinet for leading out copper busbars. The copper busbars are connected to the outgoing terminals of the circuit breaker inside the cabinet, and are supported by insulators outside the cabinet. Their lower ends are connected to the high-voltage bushings of the transformer. The circuit breaker compartment door has an operating hole, a live indicator, and an observation window. The cable compartment door has an electromagnetic lock and a counter. A copper busbar for cable mounting is reserved at the lower end of the cabinet interior.

[0006] The cabinet instrument door is also equipped with a temperature and humidity controller. The temperature and humidity sensor is located in the lower inner cavity of the cabinet and is connected to the temperature and humidity controller circuit. The lower inner cavity of the cabinet is also equipped with a dehumidifier and a heater, which are connected to the temperature and humidity controller circuit. When the cabinet temperature is too low, the heater is activated to raise the temperature. When the humidity is too high, the dehumidifier is activated to remove moisture.

[0007] Furthermore, the insulating plate is horizontally positioned between the inlet and outlet terminals of the circuit breaker to ensure the insulation effect of the circuit breaker.

[0008] Furthermore, both the circuit breaker compartment door and the cable compartment door are single doors. The cable compartment door is equipped with an observation window and lighting. A 10kV sensor II is installed at the incoming end of the circuit breaker and connected to an electromagnetic lock. A counter is connected to a surge arrester.

[0009] Furthermore, the circuit breaker compartment door is equipped with a live indicator, and a 10kV sensor I is installed on the right side of the cabinet near the copper busbar, which is connected to the live indicator circuit.

[0010] Furthermore, a copper busbar for cable mounting is provided at the bottom of the cabinet, which can be directly connected to the lower end of the circuit breaker to facilitate the connection of the on-site power collection line.

[0011] The beneficial effects of this utility model are as follows: Compared with traditional air-insulated switchgear, it optimizes dual or multiple cabinets into a single cabinet. Instrument doors, circuit breaker compartment doors, and cable compartment doors are installed from top to bottom at the front of the cabinet, clearly distinguishing the functions of each part while preventing operators from accidentally contacting internal live parts. Inside the cabinet, crossbeams are arranged according to the component configuration, with components mounted on each crossbeam. The internal electrical component structure is rationally laid out, small in size, simple in structure, and highly standardized, facilitating standardized production. The entire switchgear is installed on the high-voltage side of the transformer substation. A busbar is led out from the upper right side of the cabinet for connection to the transformer, and a copper busbar is reserved at the bottom for cable connection to the field power distribution lines. The single-cabinet switchgear significantly reduces the area of ​​the high-voltage side of the transformer substation, lowering the manufacturing cost of the transformer substation and indirectly reducing the land area used on the project site. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 for Figure 1 Sectional view along axis AA;

[0014] Figure 3 for Figure 1 BB-direction sectional view.

[0015] 1-Instrument door, 2-Circuit breaker compartment door, 3-Cable compartment door, 4-Crossbeam, 5-Voltage transformer, 6-Current transformer, 7-Circuit breaker, 8-Surge arrester, 9-Copper busbar, 10-Insulator, 11-10kV sensor I, 12-Ammeter, 13-Temperature and humidity controller, 14-Dehumidifier, 15-Insulating board, 16-Observation hole, 17-Lighting lamp, 18-Electromagnetic lock, 19-Counter, 20-Live indicator, 21-10kV sensor II, 22-Operating hole. Detailed Implementation

[0016] As attached Figure 1-3 The compact air-insulated switchgear for new energy transformers shown includes a single cabinet. From top to bottom, the front of the cabinet has an instrument door 1, a circuit breaker compartment door 2, and a cable compartment door 3. Inside the cabinet, a mounting beam 4 is installed for mounting electrical components. A voltage transformer 5 is installed at the top of the cabinet. A 10kV circuit breaker 7 is installed in the middle of the cabinet. Circuit breaker 7 is a combined circuit breaker with an insulating plate 15 in its middle. A surge arrester 8 is installed below the circuit breaker. A current transformer 6 is connected to the outgoing terminals of the circuit breaker. A copper busbar outlet is located on the upper right side of the cabinet, leading out a copper busbar 9. The copper busbar 9 is connected to the outgoing terminals of the circuit breaker inside the cabinet. Outside the cabinet, the copper busbar 9 is supported by an insulator 10, and its lower end is connected to the high-voltage bushing of the transformer. The circuit breaker compartment door has an operating hole 22, a live indicator 20, an observation window 16, and a lighting lamp 23. The cable compartment door 3 has an electromagnetic lock 18, a counter 19, and a lighting lamp 23.

[0017] The cabinet instrument door is also equipped with a temperature and humidity controller 13. The temperature and humidity sensor is located in the lower inner cavity of the cabinet. The lower inner cavity of the cabinet is also equipped with a dehumidifier and a heater. When the cabinet temperature is too low, the heater is activated to raise the temperature. When the humidity is too high, the dehumidifier is activated to dehumidify. An ammeter 12 is located on the right side of the instrument door.

[0018] The insulating plate is horizontally installed between the inlet and outlet ends of the circuit breaker to ensure the insulation effect of the circuit breaker. An insulator support 10 is provided at the inlet end of the circuit breaker.

[0019] The circuit breaker compartment door is equipped with a live indicator, and a 10kV sensor I11 is located on the right side of the cabinet near the copper busbar, which is connected to the live indicator circuit.

[0020] Both the circuit breaker compartment door and the cable compartment door are single doors. The cable compartment door is equipped with an observation window and lighting. A 10kV sensor II21 connected to an electromagnetic lock is installed at the inlet of the circuit breaker. The counter is connected to the surge arrester. A cable routing hole is provided at the bottom of the cabinet for easy cable entry.

[0021] This embodiment primarily utilizes 2.5mm thick cold-rolled steel plates, bent and assembled. Compared to previously used ZGN and other air-insulated switchgear, the cabinet has been improved from a double-cabinet type to a single-cabinet type, reducing the overall dimensions from (950mm+750mm)*1100mm*2300mm to 950mm*1050mm*2300mm (width*depth*height), significantly minimizing the cabinet volume. Furthermore, this cabinet design allows for the integration of all components, including 10kV circuit breakers, disconnect switches, current transformers, and voltage transformers, into the cabinet, reducing the path from the transformer through the internal components to the connecting cable busbars, thus lowering the busbar usage and reducing costs. The high-voltage switchgear is installed on the high-voltage side of the transformer substation. Its small size and reduced space occupation directly decrease the cabinet dimensions and substation costs, indirectly reducing the land area required for the project site and expanding the application range of this type of transformer substation. It is particularly suitable for rooftop locations such as factories and shopping malls.

[0022] 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 energy box variable compact air insulation switchgear, characterized in that: It includes single cabinet, the front of cabinet is provided with instrument door, circuit breaker room door and cable room door from top to bottom, the cabinet is provided with installation beam, the cabinet is provided with voltage transformer on top, 10KV circuit breaker is installed in the middle of cabinet, the middle of circuit breaker is provided with insulation board, lightning arrester is provided below the circuit breaker, current transformer is connected with outgoing line end of circuit breaker, copper bar outlet is provided on the right side of upper end of cabinet to lead out copper bar, copper bar is connected with outgoing line end of circuit breaker in the cabinet, copper bar is supported by insulator outside the cabinet, the lower end of copper bar is connected with high voltage sleeve of transformer, operating hole, live display and observation window are provided on circuit breaker room door, electromagnetic lock and counter are provided on cable room door, cable hanging copper bar is reserved in the lower end of inner cavity of cabinet.

2. The new energy box variable compact air insulation switchgear according to claim 1, characterized in that: The inner side of the instrument door of the cabinet is further provided with a temperature and humidity controller, and a temperature and humidity sensor is arranged in the lower end inner cavity of the cabinet.

3. The new energy box variable compact air insulation switchgear according to claim 2, characterized in that: The lower end inner cavity of the cabinet is further provided with a dehumidifier, a heater and a temperature and humidity controller circuit.

4. The new energy box compact air insulated switchgear according to claim 1, characterized in that: The insulation board is horizontally arranged between the incoming line end and the outgoing line end of the circuit breaker.

5. The new energy box compact air insulated switchgear according to claim 1, characterized in that: The circuit breaker room door and the cable room door are both single doors, the cable room door is provided with an observation window and a light, the incoming line end of the circuit breaker is provided with a 10kv sensor II connected with the electromagnetic lock, and the counter is connected with the lightning arrester.

6. The new energy box compact air insulated switchgear according to claim 1, characterized in that: The circuit breaker room door is provided with a live display, and the right side of the cabinet is provided with a 10kv sensor I connected with the live display circuit near the copper bar.

7. The new energy box compact air insulated switchgear according to claim 1, characterized in that: The cable hanging copper bar at the lower part of the cabinet is connected with the lower end of the circuit breaker.

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