Prefabricated Substation(Chinese style box)

Ⅰ.Brief Intrucodtion

1.Customization: Exclusive designs are provided for different scenarios – the “landscape compact type” is adopted in the urban core area, incorporating the Anhui-style sloping roof and new Chinese-style grille; the “economical and durable type” is launched in rural areas to enhance dust and moisture resistance; the “grid-connected type” is adapted for new energy projects and reserved for photovoltaic/wind power interfaces; for electromagnetically sensitive scientific research and medical scenarios, a special electromagnetic shielding layer can be installed.

2.Compliant Standards: Strictly compliant with Chinese and international standards, including GB/T 17467 (National Standard for Prefabricated Substations) and GB 1094 (National Standard for Power Transformers). Compatible with international standards such as IEC 62271-202 and IEEE C57.12.00, the system meets the needs of both domestic and international projects.

3.Voltage Levels:

①High-voltage side: Mainstream 6kV, 10kV, and 35kV (compatible with mainstream domestic distribution grid levels), with customization available for special voltages such as 11kV and 20kV to accommodate the differentiated needs of regional power grids.

②Low-voltage side: Standard 0.4kV (380V/220V), with customization available for industrial voltages such as 0.69kV to meet the specialized power requirements of factory power equipment and large commercial complexes.

4.Voltage Regulation Methods:

①Off-excitation voltage regulation: Simple structure and cost-effective, with a tap range of ±5%, suitable for stable loads in rural and suburban areas, such as agricultural irrigation and rural residential power supply.

②On-load voltage regulation: Supports automatic or manual voltage regulation with a tap range of ±2 × 2.5%, quickly responding to load fluctuations. Suitable for demanding voltage quality scenarios such as urban commercial centers, data centers, and precision manufacturing plants, ensuring stable operation of sensitive equipment.

5.High-voltage tap range: Conventional ±5% or ±2 × 2.5%. For example, at 10kV, the ±5% range allows for three voltage settings: 9.5kV, 10kV, and 10.5kV, adapting to grid voltage fluctuations and ensuring stable output.

6.Rated Capacity: Rated capacity ranges from 30kVA to 8000kVA, meeting the power needs of users of varying sizes.

7.Other Information:

①Power Supply: Three-phase. Default connection group: Dyn11 (suitable for non-linear loads, such as inverters and charging stations) and Yyn0 (suitable for three-phase balanced loads, such as those in general factories and residential areas).

②Impedance Voltage: 4%-8%, customizable based on system short-circuit current and load characteristics.

③Cooling Method: Oil-immersed self-cooling (ONAN, for general use), Oil-immersed air-cooling (ONAF, for large-capacity, high-load use), Dry air-cooling (SCB series, for shopping malls and hospitals with strict fire protection requirements).

④Protection Rating: Basic IP33 (for general outdoor environments), customizable IP54 (for rainy and dusty areas), IP65 (for coastal areas with high salt spray and chemical corrosion).

⑤Insulation Class: B (130°C, economical and practical), F (155°C, high-temperature resistance), H (180°C, for long-term high-load operation). Select the appropriate level based on ambient operating temperature and load factor.

Ⅱ.Operating Conditions:

1.Altitude: ≤ 1000 meters. Custom reinforced insulation design available for high-altitude areas.

2.Ambient Temperature: -25°C to +40°C

3.Relative Humidity: Daily average not exceeding 95%, monthly average not exceeding 90%

4.Maximum Monthly Average Temperature: +35°C

5.Maximum Annual Average Temperature: +20°C

6.Minimum Ambient Temperature: 25°C (outdoor)

7.Maximum Daily Temperature Difference: 25°C

8.Sunlight Intensity: 0.1W/cm² (0.5m/s)

9.Seismic Resistance: 0.2g horizontal ground acceleration; 0.1g vertical ground acceleration

10.Installation Location: Free from severe vibration, corrosive gases, explosive media, and heavy dust. Suitable for locations such as urban roadsides, residential green belts, and industrial park vacant lots.

11.Applicable Areas: Widely used in urban power grid renovation (such as power distribution upgrades in older residential areas), new rural development, industrial parks (such as manufacturing clusters), commercial complexes, municipal projects (such as subway stations and stadiums), and new energy projects (photovoltaic power stations and wind farms).

Ⅲ.Test Types:

1.Type Tests: Insulation withstand voltage test (2.5 times the rated voltage on the high-voltage side for 1 minute without breakdown), short-circuit withstand test (25kA/3s), temperature rise test (oil top temperature ≤ 95°C under full load), protection level verification (IP rating measurement), mechanical life test (switching operation ≥ 10,000 times), internal arc test (verification of arc fault protection capability).

2.Routine Tests: Loop resistance test (≤ 50μΩ), power frequency withstand voltage test, mechanical operation test (smooth switching), transformer parameter test (turn ratio, polarity, no-load loss).

3.Special tests: Noise test (≤ 50dB@1m in residential areas), EMC test (in accordance with GB 17625.1), high and low temperature cycle test (-25°C to +40°C alternating), salt spray test (≥ 500h in coastal areas).

Ⅳ.Component Testing:

1.Transformer: Oil-immersion testing of insulating oil withstand voltage (≥30kV), dielectric loss (≤0.005), and moisture content (≤10ppm); dry-type testing of partial discharge (≤10pC) and temperature rise (F-class ≤100K).

2.High-voltage components: Fuse characteristic test (breaking capacity in accordance with GB 10963), lightning arrester residual voltage test (10kV class residual voltage ≤50kV), high-voltage switch circuit resistance (≤100μΩ).

3.Low-voltage units: Circuit breaker breaking capacity (≥50kA), busbar contact resistance (≤20μΩ), reactive power compensation device capacity accuracy (±5%).

4.Enclosure: Dust and water resistance test (measured according to IP rating), mechanical strength test (resistant to 1500Pa wind pressure, 20J impact), anti-corrosion coating thickness (≥80μm, adhesion ≥5MPa).

Ⅴ.Certification Types:

1.China Certifications: GB/T 17467 Compliance Certification, CQC Voluntary Product Certification, State Grid/China Southern Power Grid Grid Access Qualification;

2.International Certifications: IEC 62271-202 (International Electrotechnical Commission), CE (European Union), AS/NZS 60076 (Australia and New Zealand Standard);

3.Industry Certifications: ISO 9001 Quality Management System Certification, ISO 14001 Environmental Management System Certification, OHSAS 18001 Occupational Health and Safety Certification.