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S22-M-6300/66-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

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66kV Oil-Immersed Renewable Energy Transformer Series

S22-M-6300/66-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

The S22-M-6300/66-NX1 is a three-phase, two-winding oil-immersed step-up transformer specifically designed for renewable energy applications (PV, wind, energy storage). With a rated capacity of 6300kVA, it steps up the low voltage from inverters/wind turbines (0.4~1.14kV) to a 66kV grid connection. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers exceptionally low no-load loss. The transformer features a fully sealed corrugated tank structure that isolates the oil from air, slowing insulation aging and enabling maintenance-free operation. The core uses high-quality cold-rolled grain-oriented silicon steel, and windings use oxygen-free copper conductors. It is specifically optimized to withstand the harmonics generated by power electronics and the frequent load fluctuations typical of renewable energy stations.
Renewable Energy
  • Core parameters
  • Rated Capacity: 6300 kVA
  • Rated Voltage Ratio: 66~72.5 / 0.4-1.14 kV
  • Connection Group: Yd11
  • Cooling Method: ONAN
  • Energy Efficiency Class: NX1
  • Standard：IEC 60076, GB 20052-2024
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Product Details

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Product Model S22-M-6300/66-NX1
No-Load Loss ≤4.0 kW
Rated Capacity 6300 kVA
No-Load Current ≤0.48%
Phase Three-phase
Load Loss (120°C) ≤30.8kW
Rated Voltage Ratio 66~72.5/0.4~1.14 kV
Short-Circuit Impedance 6~14%
HV Tapping Range ±2×2.5%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤65 dB(A)
Connection Group Yd11
Protection Degree IP55
Cooling Method ONAN
Standard IEC 60076, GB 20052-2024
Insulation Class A, LI325 AC140 / AC5
Energy Efficiency Class NX1
01.

Core advantages

Class 1 Energy Efficiency (NX1)
Complies with GB 20052-2024 Class 1 energy efficiency standard. With exceptionally low no-load loss, it minimizes the auxiliary power consumption of the renewable energy station, ensuring more generated electricity is fed into the grid. Actual measured losses are typically lower than standard limits.
Optimized for Low-Voltage High-Current & Harmonics
The low-voltage side (0.4~1.14kV) is designed with copper foil windings to handle high currents. The electromagnetic design is optimized to withstand harmonics from inverters and PCS, preventing overheating and ensuring stable operation under frequent load fluctuations.
Fully Sealed & Maintenance-Free
Fully sealed corrugated tank with vacuum oil filling isolates oil from air, preventing oxidation and moisture ingress. Requires no routine maintenance, significantly reducing O&M costs for remote wind farms and solar bases.
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.
UL
Our transformers are UL certified, confirming they meet rigorous ANSI/IEEE safety standards for North American market entry.
ASTA
Our transformers have obtained ASTA type-test certification, verifying IEC 60076 compliance.
EAC
Our transformers are EAC certified, ensuring compliance with safety and EMC regulations for the Eurasian market.
SASO
We provide SASO-compliant transformers and assist clients in obtaining the Batch Certificate of Conformity (CoC) through the SABER platform.
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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66kV Oil-Immersed Renewable Energy Transformer Series – Full Specifications

66kV, 3-phase, 2-winding, oil-immersed, off-circuit tap-changer, renewable energy transformer, 66-72.5kV / 0.4-1.14kV, 3150-20000kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss (kW)Impedance
Voltage (%)
S22-M-3150/66-NX1315066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd112.20020.7006~14
S20-M-3150/66-NX2315066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd112.60020.7006~14
S18-M-3150/66-NX3315066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd112.90023.0006~14
S22-M-4000/66-NX1400066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd112.60024.6006~14
S20-M-4000/66-NX2400066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd113.10024.6006~14
S18-M-4000/66-NX3400066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd113.40027.3006~14
S22-M-5000/66-NX1500066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd113.10027.6006~14
S20-M-5000/66-NX2500066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd113.70027.6006~14
S18-M-5000/66-NX3500066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd114.10030.7006~14
S22-M-6300/66-NX1630066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd114.00030.8006~14
S20-M-6300/66-NX2630066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd114.70030.8006~14
S18-M-6300/66-NX3630066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd115.20034.2006~14
S22-M-8000/66-NX1800066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd114.90036.5006~14
S20-M-8000/66-NX2800066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd115.80036.5006~14
S18-M-8000/66-NX3800066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd116.40040.5006~14
S22-M-10000/66-NX11000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd115.80043.0006~14
S20-M-10000/66-NX21000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd116.80043.0006~14
S18-M-10000/66-NX31000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd117.60047.8006~14
S22-M-12500/66-NX11250066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd116.80051.1006~14
S20-M-12500/66-NX21250066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd118.10051.1006~14
S18-M-12500/66-NX31250066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd118.90056.8006~14
S22-M-16000/66-NX11600066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd118.30062.8006~14
S20-M-16000/66-NX21600066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd119.80062.8006~14
S18-M-16000/66-NX31600066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd1110.80069.8006~14
S22-M-20000/66-NX12000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd119.70076.1006~14
S20-M-20000/66-NX22000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd1111.40076.1006~14
S18-M-20000/66-NX32000066, 69, 72.5±2×2.5%0.4, 0.69, 0.8, 1.14YNd1112.70084.6006~14
Note：
1.±2×2.5% is shown as the default tapping range in this table. Other tapping ranges are available upon request.
2.Other high and low voltages are available upon request.
3.Other vector groups are available upon request.
4.Efficiency classes (NX1/NX2/NX3) are in accordance with GB 20052-2024 for 66kV renewable energy transformers (PV, wind, energy storage) of 3150kVA to 20000kVA.
For IEC, ANSI, or other standards, or special 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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