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S22-M-500/10-NX1 Three-Phase Oil-Immersed Hermetically Sealed Distribution Transformer

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10kV Oil-Immersed Distribution Transformer Series

S22-M-500/10-NX1 Three-Phase Oil-Immersed Hermetically Sealed Distribution Transformer

The S22-M-500/10-NX1 is a three-phase oil-immersed fully sealed distribution transformer with a rated capacity of 500kVA and a high-voltage side rating of 10kV. The transformer features a fully sealed 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, complying with GB/T 6451-2023 technical requirements and achieving Class 1 energy efficiency (NX1) according to GB 20052-2024. It is suitable for 10kV distribution systems, providing reliable and energy-efficient power supply for industrial, commercial, and agricultural applications.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 500 kVA
  • Rated Voltage Ratio: 10/0.4 kV
  • Connection Group: Dyn11
  • Cooling Method: ONAN
  • Energy Efficiency Class: NX1
  • Standard：IEC 60076, GB/T 6451-2023
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Product Details

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Product Model S22-M-500/10-NX1
No-Load Loss ≤0.385 kW
Rated Capacity 500 kVA
No-Load Current ≤0.64%
Phase 3-phase
Load Loss (75°C) ≤3.9 kW
Rated Voltage Ratio 10/0.4 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) ≤58 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, LI75 AC35 / AC5
Energy Efficiency Class NX1
01.

Core advantages

Class 1 Energy Efficiency (NX1)
Complies with GB 20052-2024 Class 1 energy efficiency standard, minimizing no-load and load losses for the lowest long-term operating cost.
Fully Sealed Structure
Fully sealed tank isolates transformer oil from air, slows down insulation aging, and extends service life with minimal maintenance.
Low Loss Design (S22 Level)
Optimized core and coil design achieves low no-load and load losses, ensuring high efficiency and quiet operation for demanding 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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10kV Oil-Immersed Distribution Transformer Series – Full Specifications

10kV, 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-30/10-NX13010，10.5±5%0.4Dyn110.0650.4554.0
S20-M-30/10-NX23010，10.5±5%0.4Dyn110.0700.5054.0
S13-M-30/10-NX33010，10.5±5%0.4Dyn110.0800.6304.0
S22-M-50/10-NX15010，10.5±5%0.4Dyn110.0800.6554.0
S20-M-50/10-NX25010，10.5±5%0.4Dyn110.0900.7304.0
S13-M-50/10-NX35010，10.5±5%0.4Dyn110.1000.9104.0
S22-M-63/10-NX16310，10.5±5%0.4Dyn110.0900.7854.0
S20-M-63/10-NX26310，10.5±5%0.4Dyn110.1000.8704.0
S13-M-63/10-NX36310，10.5±5%0.4Dyn110.1101.0904.0
S22-M-80/10-NX18010，10.5±5%0.4Dyn110.1050.9454.0
S20-M-80/10-NX28010，10.5±5%0.4Dyn110.1151.0504.0
S13-M-80/10-NX38010，10.5±5%0.4Dyn110.1301.3104.0
S22-M-100/10-NX110010，10.5±5%0.4Dyn110.1201.1404.0
S20-M-100/10-NX210010，10.5±5%0.4Dyn110.1351.2654.0
S13-M-100/10-NX310010，10.5±5%0.4Dyn110.1501.5804.0
S22-M-125/10-NX112510，10.5±5%0.4Dyn110.1351.3604.0
S20-M-125/10-NX212510，10.5±5%0.4Dyn110.1501.5104.0
S13-M-125/10-NX312510，10.5±5%0.4Dyn110.1701.8904.0
S22-M-160/10-NX116010，10.5±5%0.4Dyn110.1601.6654.0
S20-M-160/10-NX216010，10.5±5%0.4Dyn110.1801.8504.0
S13-M-160/10-NX316010，10.5±5%0.4Dyn110.2002.3104.0
S22-M-200/10-NX120010，10.5±5%0.4Dyn110.1901.9704.0
S20-M-200/10-NX220010，10.5±5%0.4Dyn110.2152.1854.0
S13-M-200/10-NX320010，10.5±5%0.4Dyn110.2402.7304.0
S22-M-250/10-NX125010，10.5±5%0.4Dyn110.2302.3004.0
S20-M-250/10-NX225010，10.5±5%0.4Dyn110.2602.5604.0
S13-M-250/10-NX325010，10.5±5%0.4Dyn110.2903.2004.0
S22-M-315/10-NX131510，10.5±5%0.4Dyn110.2702.7604.0
S20-M-315/10-NX231510，10.5±5%0.4Dyn110.3053.0654.0
S13-M-315/10-NX331510，10.5±5%0.4Dyn110.3403.8304.0
S22-M-400/10-NX140010，10.5±5%0.4Dyn110.3303.2504.0
S20-M-400/10-NX240010，10.5±5%0.4Dyn110.3703.6154.0
S13-M-400/10-NX340010，10.5±5%0.4Dyn110.4104.5204.0
S22-M-500/10-NX150010，10.5±5%0.4Dyn110.3853.9004.0
S20-M-500/10-NX250010，10.5±5%0.4Dyn110.4304.3304.0
S13-M-500/10-NX350010，10.5±5%0.4Dyn110.4805.4104.0
S22-M-630/10-NX163010，10.5±5%0.4Dyn110.4604.4604.5
S20-M-630/10-NX263010，10.5±5%0.4Dyn110.5104.9604.5
S13-M-630/10-NX363010，10.5±5%0.4Dyn110.5706.2004.5
S22-M-800/10-NX180010，10.5±5%0.4Dyn110.5605.4004.5
S20-M-800/10-NX280010，10.5±5%0.4Dyn110.6306.0004.5
S13-M-800/10-NX380010，10.5±5%0.4Dyn110.7007.5004.5
S22-M-1000/10-NX1100010，10.5±5%0.4Dyn110.6657.4154.5
S20-M-1000/10-NX2100010，10.5±5%0.4Dyn110.7458.2404.5
S13-M-1000/10-NX3100010，10.5±5%0.4Dyn110.83010.3004.5
S22-M-1250/10-NX1125010，10.5±5%0.4Dyn110.7808.6404.5
S20-M-1250/10-NX2125010，10.5±5%0.4Dyn110.8709.6004.5
S13-M-1250/10-NX3125010，10.5±5%0.4Dyn110.97012.0004.5
S22-M-1600/10-NX1160010，10.5±5%0.4Dyn110.94010.4404.5
S20-M-1600/10-NX2160010，10.5±5%0.4Dyn111.05011.6004.5
S13-M-1600/10-NX3160010，10.5±5%0.4Dyn111.17014.5004.5
S22-M-2000/10-NX1200010，10.5±5%0.4Dyn111.08513.1805.0
S20-M-2000/10-NX2200010，10.5±5%0.4Dyn111.22514.6405.0
S13-M-2000/10-NX3200010，10.5±5%0.4Dyn111.36018.3005.0
S22-M-2500/10-NX1250010，10.5±5%0.4Dyn111.28013.3605.0
S20-M-2500/10-NX2250010，10.5±5%0.4Dyn111.44014.8405.0
S13-M-2500/10-NX3250010，10.5±5%0.4Dyn111.60021.2005.0
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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