YBMF□-40.5/0.69 series wind power box type substation (hereinafter referred to as box transformer) is a specialized equipment that increases the voltage of 0.6-0.69kV generated by wind turbines to 35kV and connects it to the grid for output. This product is a new product developed by our company to meet the requirements of large single unit capacity and high protection for offshore wind farms.

1. Basic floor plan:

2. The base and upper plane in the picture are made of @ 200 concrete (reinforced with φ 16);

3. The number and orientation of pre embedded cables in the foundation are determined by the user based on the number and orientation of cables;

4. All embedded iron parts and supporting components within the foundation should be grounded;

5. The number of grounding rods is determined by the soil conditions, and the grounding resistance must be protected to be less than 4 Ω;

6. The grounding wire can be made of 40x4 galvanized flat steel, and the grounding wire can be made of 5 # angle steel;

7. The connection between the grounding electrode and the grounding wire is welded and coated with asphalt for corrosion prevention.

1. High voltage switchgear, transformers, and low voltage switchgear are integrated into one, with strong completeness: low damage, low noise, superior performance, and the box adopts anti-theft structure:

2. Complete high and low voltage protection, safe and reliable operation, and simple maintenance; Flexible and diverse continuation plans:

3. High voltage is generally protected by a combination of load switches and fuses. After one phase of the fuse is blown, the three phases are interlocked and tripped. The load switch has vacuum, sulfur hexafluoride and other types to choose from, and can be equipped with an electric operating mechanism to achieve automation upgrade. The fuse is a high-voltage current limiting fuse with an impactor, reliable action, and large breaking capacity. The main technical parameters are shown in the table below. It is recommended to use vacuum load switch products for high-voltage load switches. The spring operated mechanism adopts AC220V operation, and can be equipped with box transformer protection devices, light and heavy gas interfaces, and fuses according to the transformer capacity, with lightning arresters and live display devices. There is a reliable mechanical interlock between the vacuum arc extinguishing chamber, isolation switch, and grounding switch of the composite electrical device. Only when the vacuum arc extinguishing chamber is in the open state can the isolation switch and grounding switch be operated, and the isolation switch and grounding switch are linked. The tripping device of the fuse is a three pole linkage, and the fuse used is a firing pin fuse. The impactor can directly disconnect the load switch, ensuring that the fault can be quickly cut off.

4. The low-voltage side main switch adopts universal or intelligent circuit breakers for selective protection.

5. Choose low loss, oil immersed, fully sealed S9, S10, S11 series transformers, or environmentally friendly dry-type transformers with resin insulation or NOMEX paper insulation. The bottom is equipped with a trolley, and the transformer can be easily accessed.

6. The shell material adopts non-metallic environmentally friendly box body, which is corrosion-resistant and salt spray resistant. Composite plates, stainless steel plates, etc. can also be used.

7. Box type transformers can add operating corridors on the high and low voltage sides according to user requirements.