Product Overview

The YB33 series box-type substation for wind power generation (hereafter referred to as "box substation") is a specialized device designed to step up the 0.6–0.69 kV voltage generated by wind turbines to 35 kV before connecting them to the grid. This product was developed by our company specifically to meet the demanding requirements of offshore wind farms, which typically feature large single-unit capacities and high levels of protection.

Conditions and Environmental Requirements

● Altitude not exceeding 2500m.

● Ambient temperature: -45°C to +45°C.

● Relative humidity: The daily average should not exceed 95%, and the monthly average should not surpass 90%.

● Installation location: Areas free from fire hazards, explosion risks, conductive dust, chemically corrosive gases, and severe vibrations. If these conditions are not met, users may contact our company for further discussion.

Ordering Instructions (Please specify when placing your order)

1. The product’s full model number includes the main circuit scheme number and the auxiliary circuit scheme number.

2. Main Circuit System Combination Sequence Diagram.

3. Installation layout diagram.

4. Auxiliary Circuit Electrical Schematic.

5. Set parameters in the circuit, such as voltage, current, and time.

6. Other special requirements that do not align with the product's normal usage.

7. For other specific engineering requirements, please consult with our company and design according to your exact needs.

Product Features

1. The high-voltage switchgear, transformer, and low-voltage switchgear are integrated into a single, highly complete unit—boasting low damage, minimal noise, and superior performance. Additionally, the enclosure features an anti-theft design.

2. Advanced high- and low-voltage protection ensures safe, reliable operation and easy maintenance; the wiring solutions are flexible and versatile.

3. High-voltage systems typically employ load switch-fuse combination devices for protection. Once a single-phase fuse blows, the three phases simultaneously trip via interlocked mechanisms. Load switches are available in vacuum and sulfur hexafluoride (SF6) models, with optional electric operating mechanisms for seamless automation upgrades. The fuses used are high-voltage current-limiting types equipped with impactors, ensuring reliable operation, robust breaking capacity, and key technical specifications. For high-voltage load switches, vacuum load switch products are strongly recommended. These switches feature spring-operated mechanisms powered by AC 220V and can be integrated with packaged substation protection units, complete with light and heavy gas interface connections. Additionally, fuses should be selected based on the transformer’s capacity, and each setup must include surge arresters and live-display devices. The combination device incorporates a reliable mechanical interlock system between the vacuum arc-extinguishing chamber, isolating knife switch, and grounding knife switch. Specifically, the isolating and grounding knife switches can only be operated when the vacuum arc-extinguishing chamber is in the open position—ensuring safe and coordinated operation of these critical components. Furthermore, the fuse tripping mechanism is designed as a three-pole interlock, paired with pin-type fuses that enable the impactor to directly disconnect the load switch, guaranteeing rapid fault isolation.

4. The main switch on the low-voltage side uses a universal-type or intelligent circuit breaker for selective protection.

5. Opt for low-loss, oil-immersed, fully sealed transformers from the S9, S10, and S11 series. Alternatively, environmentally friendly dry-type transformers with resin insulation or NOMEX paper insulation are also available. All models come equipped with casters at the base, allowing for easy in-and-out movement of the transformer.

6. The enclosure material features a non-metallic, eco-friendly housing that is corrosion-resistant and salt-spray proof. Alternatively, composite panels or stainless steel sheets can also be used.

7. The packaged substation can be equipped with an operational walkway on both the high- and low-voltage sides, as per customer requirements.

Technical Requirements

1. Basic floor plan;

2. Both the base and the top surface in the diagram are constructed using 200-grade concrete (reinforced with Ф16 bars).

3. The number and orientation of cables pre-embedded within the foundation shall be determined by the user based on the actual number and positioning of the cables.

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

5. The number of grounding rods is determined by soil conditions, and it is essential to ensure the grounding resistance remains below 4 ohms. Ω 。

6. The grounding wire can be made from 40x4 galvanized flat steel, while the grounding rod can be fabricated using 5# angle steel.

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

Plan Structural Dimension Drawing

A-A Section View

B-B Section View