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S22-M-250/6 Three-Phase Oil-Immersed Hermetically Sealed Distribution Transformer

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6kV Oil-Immersed Distribution Transformer Series

S22-M-250/6 Three-Phase Oil-Immersed Hermetically Sealed Distribution Transformer

The S22-M-250/6 is a three-phase oil-immersed fully sealed distribution transformer with a rated capacity of 250kVA and a high-voltage side rating of 6kV. The transformer features a fully sealed corrugated tank structure that isolates the transformer oil from air, effectively delaying insulation aging. The core is made of high-quality cold-rolled silicon steel, and both high and low voltage windings use oxygen-free copper conductors. The product is designed with S22 loss level, offering lower no-load loss compared with conventional models, and complies with GB/T 6451-2023 technical requirements for 6kV distribution transformers. It is suitable for 6kV distribution systems, providing reliable and energy-efficient power supply for industrial, agricultural, and lighting applications.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 250 kVA
  • Rated Voltage Ratio: 6/0.4 kV
  • Connection Group: Dyn11
  • Cooling Method: ONAN
  • Energy Efficiency Class: N/A
  • Standard：IEC 60076, GB/T 6451-2023
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Product Details

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Product Model S22-M-250/6
No-Load Loss ≤0.23kW
Rated Capacity 250 kVA
No-Load Current ≤0.72%
Phase 3-phase
Load Loss (75°C) ≤2.3 kW
Rated Voltage Ratio 6/0.4 kV
Short-Circuit Impedance 4%
HV Tapping Range ±2×2.5%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤55 dB(A)
Connection Group Dyn11 (Yyn0 available upon request)
Protection Degree IP65
Cooling Method ONAN
Standard IEC 60076, GB/T 6451-2023
Insulation Class A, LI60 AC25 / AC5
Energy Efficiency Class N/A
01.

Core advantages

Low Loss Design (S22 Level)
Optimized core and coil design achieves low no-load and load losses, meeting the requirements of GB/T 6451-2023.
Fully Sealed Structure
Corrugated tank fully sealed design isolates air, slows down insulation aging, and extends service life.
High Efficiency & Low Noise
Optimized core and coil design ensures low no-load loss and quiet operation, ideal for noise-sensitive applications.
02.

Application scenarios

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01.

Authoritative Certification

CE
Our transformers are CE certified, ensuring full compliance with EU safety, health, and environmental standards for seamless market access across the European Economic Area.
UL
Our transformers hold UL certification, confirming they meet rigorous ANSI/IEEE safety standards—essential for North American market entry.
ASTA
Our transformers have obtained ASTA type-test certification, verifying IEC 60076 compliance. Widely recognized in global tenders for power equipment.
EAC
Our transformers are EAC certified, ensuring full compliance with safety and EMC regulations for the Eurasian market.
SASO
Our partner factories hold SASO IECEE recognition certificates. We assist clients in obtaining the required Batch Certificate of Conformity (CoC) through the SABER platform to ensure smooth customs clearance in Saudi Arabia.
02.

Quality Assurance

Partner Factory Audit
Regular on-site audits of partner factories to verify ISO, CE, and UL certifications.
Full-Process Quality Control
From raw material inspection to pre-shipment final inspection, every unit is checked against specifications.
Comprehensive Test Reports
Each transformer includes a detailed factory test report. 100% full inspection before dispatch.
Third-Party Inspection Support
SGS, BV, or other accredited third-party inspection available upon customer request.
01.

Technical Documents

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02.

Certification Materials

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6kV Oil-Immersed Distribution Transformer Series – Full Specifications

6kV, 3-phase, 2-winding, oil-immersed, off-circuit tap-changer, distribution transformer, 30-2500kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss
(75°C) (kW)		Impedance
Voltage (%)
S22-M-30/6306，6.3±5%0.4Dyn110.0650.4554
S20-M-30/6306，6.3±5%0.4Dyn110.0700.5054
S13-M-30/6306，6.3±5%0.4Dyn110.0800.6304
S22-M-50/6506，6.3±5%0.4Dyn110.0800.6554
S20-M-50/6506，6.3±5%0.4Dyn110.0900.7304
S13-M-50/6506，6.3±5%0.4Dyn110.1000.9104
S22-M-63/6636，6.3±5%0.4Dyn110.0900.7854
S20-M-63/6636，6.3±5%0.4Dyn110.1000.8704
S13-M-63/6636，6.3±5%0.4Dyn110.1101.0904
S22-M-80/6806，6.3±5%0.4Dyn110.1050.9454
S20-M-80/6806，6.3±5%0.4Dyn110.1151.0504
S13-M-80/6806，6.3±5%0.4Dyn110.1301.3104
S22-M-100/61006，6.3±5%0.4Dyn110.1201.1404
S20-M-100/61006，6.3±5%0.4Dyn110.1351.2654
S13-M-100/61006，6.3±5%0.4Dyn110.1501.5804
S22-M-125/61256，6.3±5%0.4Dyn110.1351.3604
S20-M-125/61256，6.3±5%0.4Dyn110.1501.5104
S13-M-125/61256，6.3±5%0.4Dyn110.1701.8904
S22-M-160/61606，6.3±5%0.4Dyn110.1601.6654
S20-M-160/61606，6.3±5%0.4Dyn110.1801.8504
S13-M-160/61606，6.3±5%0.4Dyn110.2002.3104
S22-M-200/62006，6.3±5%0.4Dyn110.1901.9704
S20-M-200/62006，6.3±5%0.4Dyn110.2152.1854
S13-M-200/62006，6.3±5%0.4Dyn110.2402.7304
S22-M-250/62506，6.3±5%0.4Dyn110.2302.3004
S20-M-250/62506，6.3±5%0.4Dyn110.2602.5604
S13-M-250/62506，6.3±5%0.4Dyn110.2903.2004
S22-M-315/63156，6.3±5%0.4Dyn110.2702.7604
S20-M-315/63156，6.3±5%0.4Dyn110.3053.0654
S13-M-315/63156，6.3±5%0.4Dyn110.3403.8304
S22-M-400/64006，6.3±5%0.4Dyn110.3303.2504
S20-M-400/64006，6.3±5%0.4Dyn110.3703.6154
S13-M-400/64006，6.3±5%0.4Dyn110.4104.5204
S22-M-500/65006，6.3±5%0.4Dyn110.3853.9004
S20-M-500/65006，6.3±5%0.4Dyn110.4304.3304
S13-M-500/65006，6.3±5%0.4Dyn110.4805.4104
S22-M-630/66306，6.3±5%0.4Dyn110.4604.4604.5
S20-M-630/66306，6.3±5%0.4Dyn110.5104.9604.5
S13-M-630/66306，6.3±5%0.4Dyn110.5706.2004.5
S22-M-800/68006，6.3±5%0.4Dyn110.5605.4004.5
S20-M-800/68006，6.3±5%0.4Dyn110.6306.0004.5
S13-M-800/68006，6.3±5%0.4Dyn110.7007.5004.5
S22-M-1000/610006，6.3±5%0.4Dyn110.6657.4154.5
S20-M-1000/610006，6.3±5%0.4Dyn110.7458.2404.5
S13-M-1000/610006，6.3±5%0.4Dyn110.83010.3004.5
S22-M-1250/612506，6.3±5%0.4Dyn110.7808.6404.5
S20-M-1250/612506，6.3±5%0.4Dyn110.8709.6004.5
S13-M-1250/612506，6.3±5%0.4Dyn110.97012.0004.5
S22-M-1600/616006，6.3±5%0.4Dyn110.94010.4404.5
S20-M-1600/616006，6.3±5%0.4Dyn111.05011.6004.5
S13-M-1600/616006，6.3±5%0.4Dyn111.17014.5004.5
S22-M-2000/620006，6.3±5%0.4Dyn111.08513.1805
S20-M-2000/620006，6.3±5%0.4Dyn111.22514.6405
S13-M-2000/620006，6.3±5%0.4Dyn111.36018.3005
S22-M-2500/625006，6.3±5%0.4Dyn111.28013.3605
S20-M-2500/625006，6.3±5%0.4Dyn111.44014.8405
S13-M-2500/625006，6.3±5%0.4Dyn111.60021.2005
Note：
1.Tapping range options: ±5% or ±2×2.5%. ±5% is shown as default in this table. Other tapping ranges are available upon request.
2.Other low voltages are available upon request.
3.Other vector groups (e.g., Yyn0, Yzn11) are available upon request.
4.For IEC, ANSI, or other standards, or special voltage/frequency requirements, please contact us for a customized datasheet.

* For specific product requests, please Contact Us for customized solutions to your needs.

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