S23-M 10kV Fully Sealed Oil-Immersed Distribution Transformer
I. Product Introduction
The S23-M Series is a GB 20052-2024 Level 1 energy efficiency three-phase oil-immersed fully sealed distribution transformer. It adopts a high-permeability silicon steel core, full copper windings, and a corrugated fully sealed oil tank structure, and complies with GB/T 6451, GB 1094 and other relevant standards.
Featuring ultra-low loss, high reliability, maintenance-free operation, and long service life, the product is a standard energy-saving oil-immersed transformer widely used in new power grids, industrial and commercial power distribution, renewable energy systems, and public buildings.
II. Core Technical Parameters（customizable）
Rated Voltage: HV 10kV (6/10.5/11kV optional), LV 0.4kV
Rated Capacity: 30–2500 kVA
Phase / Frequency: Three-phase, 50 Hz
Vector Group: Dyn11 (recommended), Yyn0
Tap Changing Method: Off-circuit tap changing, ±2 × 2.5%
Cooling Method: ONAN (Oil Natural Air Natural)
Insulation Class: Class A, temperature rise ≤ 60K
Impedance Voltage: 4.0% – 6.0% (depending on capacity)
Protection Level: IP54
Partial Discharge: ≤ 10 pC
Noise Level: ≤ 50–55 dB (at 1 m)
Energy Efficiency Level: GB 20052-2024 Level 1 Energy Efficiency
III. Main Features
1. Level 1 Energy Efficiency – Ultimate Energy Saving
No-load and load losses are significantly lower than national standards and much lower than S11 and S13 transformers, reducing long-term electricity costs and ensuring fast return on investment.
2. Fully Sealed, Maintenance-Free
The corrugated oil tank isolates air and moisture, preventing insulation oil aging and enabling lifetime oil-free replacement and maintenance-free operation.
3. Strong Short-Circuit Resistance
Full copper windings, optimized ampere-turn distribution, and a robust structural design ensure high resistance to short-circuit impacts and stable operation.
4. Low Noise and Low Vibration
Multi-step lap core design and anti-loosening structure effectively reduce noise and vibration, suitable for residential areas, schools, and hospitals.
5. Excellent Overload and Environmental Adaptability
Optimized oil duct cooling allows short-term overload operation. Suitable for outdoor installation, pole-mounted systems, and box-type substations, adapting to high/low temperatures, humidity, and dusty environments.
6. Safe, Reliable, and Long Service Life
Equipped with pressure relief valves, temperature control, and gas protection, ensuring high operational safety and slow insulation aging for extended service life.
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IV. Application Scenarios
Power Grid Construction & Upgrades: Urban and rural distribution networks, box-type substations, outdoor pole-mounted transformers
Industrial & Commercial Facilities: Industrial parks, factories, shopping malls, hotels, office buildings
Public Infrastructure: Hospitals, schools, data centers, rail transit, airports, and stations
Renewable Energy Projects: Solar PV, wind power, and energy storage distribution systems
High-Demand Applications: Projects with high load rates, long-term operation, and strict energy-saving and noise-reduction requirements.
