（1）Product Overview
S20-M is an upgraded energy-saving fully sealed oil-immersed distribution transformer with much lower loss than traditional series. Adopting vacuum oil filling and fully sealed structure to isolate moisture, it is maintenance-free, low noise and strong impact resistance, customizable on demand, suitable for various medium and low voltage power distribution projects.
（2）Model Definition (Model Composition Diagram)
S 20 - M
│ │ │ │
│ │ │ └── Structure Type: M=Fully Sealed Type (Corrugated Oil Tank, No Oil Conservator, Maintenance-free)
│ │ └── Separator
│ └── Performance Level Code: Level 20 (Ultra-Ultra Low Loss Energy-saving Type, Complying with National First-class Energy Efficiency Standard)
└── Phase: S=Three-phase (Oil-immersed Power Transformer, Customizable for Multiple Capacities/Voltages)
（3）Product Features
1. Ultra-Ultra Low Loss & Energy Saving: Adopting high-grade cold-rolled oriented silicon steel sheet, no-load and load loss are significantly lower than S13 series, saving more electricity costs for long-term operation and complying with the latest energy-saving standards.
2. Fully Sealed & Maintenance-free: Corrugated oil tank isolates air and moisture, no breather, no oil conservator, no daily inspection required, greatly reducing operation and maintenance costs and extending equipment service life.
3. Silent & Stable Operation: Optimized iron core lamination and body shock absorption structure, noise index is better than industry standards, suitable for noise-sensitive scenarios such as residential areas and commercial complexes.
4. Safety & Short-circuit Resistance: Compact winding and high-strength pressing, reliable insulation, no leakage, strong short-circuit and impact resistance, safer operation.
5. Flexible Customization: Capacity, voltage, protection level, overall dimension and other parameters can be customized on demand to accurately match the needs of different power distribution scenarios.
（4）Application Environmental Conditions
Environmental Parameter | Allowable Condition |
Ambient Temperature | -25℃ ～ +45℃ |
Altitude | ≤1000m, customizable for high altitude |
Relative Humidity | ≤90% (25℃) |
Pollution Grade | Class Ⅱ, upgradable to Class Ⅲ anti-corrosion |
Installation Place | Indoor/outdoor available, no strong corrosion, no severe vibration, no flammable and explosive gas |
（5）Application Scenarios
Urban and rural power grid renovation, residential communities, industrial and mining enterprises, PV and wind power supporting, industrial parks, overseas power distribution projects and other medium and low voltage power distribution fields.
（6）Main Technical Parameters (Core Parameters Table of the Same Series)
Capacity(kVA) | No-Load Loss(W) | Load Loss(W) | No-Load Current(%) | Impedance Voltage(%) |
30 | 62 | 580 | 1.6 | 4.0 |
50 | 80 | 820 | 1.5 | 4.0 |
100 | 118 | 1380 | 1.3 | 4.0 |
200 | 190 | 2400 | 1.0 | 4.0 |
315 | 265 | 3500 | 0.9 | 4.0 |
500 | 365 | 5000 | 0.7 | 4.0 |
630 | 440 | 6000 | 0.6 | 4.5 |
800 | 520 | 7300 | 0.6 | 4.5 |
1000 | 600 | 8800 | 0.5 | 4.5 |
1600 | 890 | 12500 | 0.4 | 4.5 |
2500 | 1260 | 18000 | 0.3 | 4.5 |
（7）Referenced Standards
1. GB 1094.1~5 Power Transformer Series Standards
2. GB/T 6451-2015 Technical Parameters and Requirements for Oil-Immersed Power Transformers
3. GB 20052-2020 Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Power Transformers
4. IEC 60076 International Electrotechnical Commission Transformer Standards
5. ISO 9001 Quality Management System Certification Standard
6. GB/T 10228-2015 Technical Parameters and Requirements for Dry-Type Power Transformers (Adapting to Extended Standards for Customized Models)
