YB□-40.5/0.69-1600 Wind Power & Photovoltaic Combined Prefabricated Substation
YB□ series is a combined prefabricated substation specially designed for wind power and photovoltaic power generation systems, rated at 40.5kV/0.69kV. It integrates high-voltage switchgear, step-up transformers, low-voltage distribution equipment, and a comprehensive monitoring system into a single weatherproof container-type enclosure, providing a complete power collection and grid-connection solution for large-scale renewable energy projects.
The step-up transformer converts the inverter output voltage (0.69kV) to medium voltage (40.5kV) for connection to the collector network, significantly reducing power transmission losses compared to lower voltage collection schemes — typically reducing I²R losses by over 95% compared to 690V collection over the same distance.
The monitoring system is equipped with complete protection, measurement, control, and signal loops integrated into a coordinated automation architecture. The low-voltage switchgear incorporates reliable prefabricated substation measurement and control units specifically adapted to low-temperature and high-humidity condensation environments common in wind and solar farm installations, along with corresponding fiber optic connection equipment for high-bandwidth, EMI-immune communication. These units collect various electrical parameters (voltage, current, power, frequency, power factor) and non-electrical parameters (transformer oil temperature, winding temperature, enclosure internal temperature, humidity, and door status) within the prefabricated substation, meeting the measurement and control requirements of the photovoltaic power plant’s integrated SCADA automation system.
Technical Specifications
| Item | Specification |
|---|---|
| Model | YB□-40.5/0.69-1600 |
| Rated Voltage (HV Side) | 40.5kV |
| Rated Voltage (LV Side) | 0.69kV (690V) — compatible with inverter output |
| Rated Capacity | 1000kVA – 5000kVA (customizable per project) |
| Rated Frequency | 50Hz / 60Hz |
| Transformer Type | Oil-immersed, self-cooling (ONAN), amorphous alloy or S20 series low-loss |
| No-Load Loss (Amorphous Core) | Up to 50–70% lower than conventional grain-oriented silicon steel (CRGO) transformers |
| HV Protection | SF6 load break switch + current-limiting fuse / Vacuum circuit breaker (up to 1250A) |
| LV Incoming | Main moulded case circuit breaker (MCCB) or air circuit breaker (ACB) — up to 3200A |
| Monitoring Interface | Integrated measurement and control unit with fiber optic communication |
| Communication Protocols | IEC 61850 / Modbus RTU / Modbus TCP / DNP3 (configurable) |
| Enclosure Type | Container-type, weatherproof steel enclosure |
| Enclosure Material | Heavy-duty steel plate with anti-corrosion and anti-UV coating |
| Degree of Protection | IP44 / IP54 |
| Ambient Temperature Range | -25°C to +40°C (low-temperature option: -40°C) |
| Standards | IEC 62271-202, GB/T 17467 |
Key Features
- Renewable Energy Optimized Design: Purpose-built for wind farm and solar PV plant applications with 40.5kV/0.69kV voltage ratio matching standard inverter output and medium voltage collection network requirements — eliminating the need for intermediate transformation stages
- Low-Loss Amorphous Alloy Transformer Core: Optional amorphous alloy transformer core reduces no-load losses by 50–70% compared to conventional CRGO silicon steel cores, delivering significant energy savings over the 20+ year service life — the lower no-load loss also reduces transformer temperature rise, improving overload capacity and extending insulation life
- Integrated Monitoring and Automation System: Complete protection, measurement, control, and signal loops with fiber optic communication enable seamless integration with plant-level SCADA systems — supports IEC 61850 protocol for substation automation interoperability and “four-remote” functions (remote measurement, signaling, control, and regulation) for fully unmanned operation
- Harsh Environment Adaptability: LV measurement and control units are designed with conformal coating and condensation-resistant printed circuit boards for reliable operation in high-humidity environments with large diurnal temperature swings common in desert, coastal, and high-altitude solar farms
- Fiber Optic Communication: All communication between LV measurement units and the station-level controller is via fiber optic cables, providing complete electrical isolation, immunity to electromagnetic interference (EMI) from high-voltage equipment and power cables, and reliable data transmission over long distances
- Comprehensive Parameter Collection: Collects and transmits all critical electrical parameters (three-phase voltage, current, active/reactive power, power factor, frequency, harmonic distortion) and non-electrical parameters (transformer top-oil temperature, winding hot-spot temperature, enclosure internal temperature/humidity, door position status, fire alarm status) for complete substation condition monitoring
- Container-Type Weatherproof Enclosure: Standardized container dimensions enable cost-effective transportation, rapid installation, and easy future relocation — factory-assembled and tested, requiring only foundation preparation, cable connection, and commissioning on site
- Grid Code Compliance: Designed to meet grid connection requirements including low-voltage ride-through (LVRT), reactive power compensation, power quality, and anti-islanding protection as specified by national grid codes for renewable energy integration
Applications
- Large-scale centralized photovoltaic (PV) solar power plants — utility-scale solar farms
- Onshore and offshore wind farm power collection and step-up substations
- Wind-solar hybrid renewable energy projects
- Energy storage system (ESS) — battery energy storage power collection and grid connection
- Distributed energy resource (DER) aggregation and microgrid integration
- Remote area electrification with renewable energy sources
- Industrial park combined heat and power (CHP) systems