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S22 Oil-Immersed Transformer Product Details 

1. Product Introduction 

The S22 series oil-immersed distribution transformers are Class I energy-efficient (NX1) three-phase double-winding non-excited voltage-regulating transformers compliant with national standards including GB 1094, GB/T 6451, and GB 20052-2024. Building upon the S20 model, these transformers incorporate advanced technologies such as high-permeability silicon steel sheets, optimized magnetic circuit design, full copper windings, and fully sealed oil tanks, significantly reducing no-load losses, load losses, and operational noise. They serve as primary energy-saving distribution equipment for urban/rural power grids, industrial power distribution, commercial/public buildings, and renewable energy applications. Featuring oil-immersed self-cooling ONAN cooling technology, the product offers superior short-circuit resistance, extended service life, maintenance-free operation, and low operational costs. It supports diverse installation configurations including indoor/outdoor applications, transformer racks, distribution substations, and power distribution rooms.

2. Core Technical Parameters (Common Specifications for 10kV Class Customizable) 

Basic Parameters 

• Model: S22-M-□/10 (Fully Sealed) 

• Rated Capacity: 30–2500kVA

 • Voltage Combination: 10kV±2×2.5%/0.4kV

 • Frequency: 50Hz

 • Connection Group: Dyn11 (preferred), Yyn0 

• Cooling Method: ONAN (Oil-immersed self-cooling); large-capacity models may be equipped with ONAF air cooling

 • Insulation Level: LI75AC35/AC5 

• Impedance Voltage: 4.0%–4.5% of 10kV class voltage

 • Insulation Class: Grade A (winding temperature rise ≤65K, oil surface temperature rise ≤55K) 

• Operating Environment: -25℃–+40℃, altitude ≤1000m 

• Protection Rating: IP20 Typical Loss Parameters (Class 1 Energy Efficiency) Capacity (kVA) No-load Loss (W) Load Loss (75℃, W) 100 170 730 200 290 1200 400 480 2050 500 570 2450 800 810 3500 1000 940 4200 1250 1060 5000 1600 1260 6200 2000 1450 7400 2500 1680 8800

3. Key Features 

1. Class 1 Energy Efficiency for Extreme Energy Saving No-load loss reduced by 20%–30% compared to S13 and 40%–50% compared to S11, resulting in significant long-term electricity cost savings and optimal lifecycle costs.

2. Low-noise operation and environmental friendliness: The optimized core joint and winding fastening structure reduces noise levels by approximately 20% compared to national standards, making it suitable for noise-sensitive areas such as residential communities, schools, and hospitals.

3. Fully sealed structure with maintenance-free design: The corrugated oil tank/plate dispersion system combined with full sealing design effectively isolates air and moisture, delaying oil degradation to achieve long-term oil-free operation and minimal maintenance requirements.

4. Strong short-circuit resistance and high reliability: The all-copper winding + multi-layer insulation + integral pressing process ensures robust short-circuit resistance, excellent overload capacity, and stable operation.

5. Excellent heat dissipation performance and heavy-load adaptability: Oil-immersed self-cooling systems demonstrate high thermal efficiency, capable of withstanding continuous high loads and frequent start-stop cycles without capacity reduction in high-temperature environments.

6. Comprehensive safety protection: Standard equipment includes pressure relief valve, oil level gauge, and thermometer; optional accessories include gas relay, temperature controller, and online oil chromatography monitoring, ensuring full safety assurance.

7. Compact and lightweight design with high power density, facilitating transportation, rack installation, and substation integration.

4. Application Scenarios

• Urban and Rural Power Grid Modernization: New construction of 10kV distribution networks by State Grid/Southern Power Grid, replacement of aging transformers, and energy efficiency upgrades for transformer districts.

• Industrial power distribution: Main transformers for workshops/parks of high-energy-consuming enterprises such as chemical, metallurgical, mining, manufacturing, and textile industries, compatible with both impulse loads and continuous operation.

• Commercial and public buildings: reliable power supply for shopping malls, office buildings, hotels, hospitals, schools, airports, stations, data centers, and 5G base stations.

• New energy infrastructure: photovoltaic systems, wind power substation transformers for voltage boosting/distribution, and energy storage stations with supporting transformers.

• Municipal and residential sectors: residential communities, renovation of old residential areas, outdoor platform substations, and containerized substations.

• Special environments: remote mountainous areas, outdoor open spaces, high humidity/high dust levels/non-explosion-proof hazardous zones (non-flammable and non-explosive core areas).