S22-M-500/6-NX1 - TAIXUANTECH

S22-M-500/6-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

6kV Oil-Immersed Renewable Energy Transformer Series

S22-M-500/6-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

The S22-M-500/6-NX1 is a three-phase, two-winding oil-immersed distribution transformer with a fully sealed corrugated tank and an off-circuit tap changer, rated at 500kVA and 6kV on the high-voltage side. It is designed specifically for PV, wind, and energy storage applications, meeting Class 1 energy efficiency (NX1) under GB 20052-2024. The transformer features a fully sealed corrugated tank structure that isolates the transformer oil from air, slowing down insulation aging and enabling maintenance-free operation. The core is made of high-quality cold-rolled grain-oriented silicon steel with optimized 45° fully-mitred step-lap construction. Windings use high-purity oxygen-free copper conductors. For renewable energy service, it offers enhanced harmonic withstand capability, wide-temperature-range adaptability, and stable operation under frequent load cycling, suitable for desert, coastal, and high-altitude sites.

Industrial & Commercial Renewable Energy Utility & Grid

Rated Capacity: 500 kVA
Rated Voltage Ratio: 6-7.2 / 0.4-1.14 kV
Connection Group: Dyn11
Cooling Method: ONAN
Energy Efficiency Class: NX1
Standard：IEC 60076, GB/T 6451-2023, GB 20052-2024

Product Details

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Product Model S22-M-500/6-NX1

No-Load Loss ≤0.385 kW

Rated Capacity 500 kVA

No-Load Current ≤0.4%

Phase Three-phase

Load Loss (120°C) ≤3.9 kW

Rated Voltage Ratio 6~7.2/0.4~1.14 kV

Short-Circuit Impedance 4~8%

HV Tapping Range ±5%

Temperature Rise Limit Top oil ≤55K, Winding ≤65K

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤55 dB(A)

Connection Group Dyn11

Protection Degree IP65

Cooling Method ONAN

Standard IEC 60076, GB/T 6451-2023, GB 20052-2024

Insulation Class A, LI60 AC25 / AC5

Energy Efficiency Class NX1

01.

Core advantages

Class 1 Energy Efficiency (NX1)

Complies with GB 20052-2024 Class 1 energy efficiency standard. No-load loss is reduced by approximately 40–45% compared with S11-M. For PV night-time no-load operation and energy storage standby mode, the transformer remains energized at low load for extended periods, making this advantage particularly pronounced. Incremental investment typically pays back within 3–5 years.

Renewable Energy Optimized

Designed for the 3rd–50th order harmonics generated by PV/wind inverters and storage PCS. Optimized core and winding ensure stable temperature rise under frequent high-low load cycling (typical for wind and PV). Wide-temperature-range design suitable for desert, coastal, and high-altitude environments.

Fully Sealed Structure

Fully sealed corrugated tank with vacuum oil filling isolates oil from air. C4-level anti-corrosion coating (≥240μm) and 316L stainless steel fasteners available for coastal/salt-spray sites. Maintenance-free operation reduces O&M costs for remote renewable energy stations.

02.

Application scenarios

No data was found

01.

Authoritative Certification

Our transformers are CE certified, ensuring full compliance with EU safety, health, and environmental standards.

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

No data was found

02.

Certification Materials

No data was found

6kV Oil-Immersed Renewable Energy Transformer Series – Full Specifications

6kV, 3-phase, 2-winding, oil-immersed, off-circuit tap-changer, renewable energy transformer, 6-7.2kV / 0.4-1.14kV, 500-2000kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	Load Loss (kW)	Impedance Voltage (%)
S22-M-500/6-NX1	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.385	3.900	4~8
S20-M-500/6-NX2	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.430	4.330	4~8
S18-M-500/6-NX3	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.480	5.410	4~8
S22-M-630/6-NX1	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.460	4.460	4~8
S20-M-630/6-NX2	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.510	4.960	4~8
S18-M-630/6-NX3	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.570	6.200	4~8
S22-M-800/6-NX1	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.560	5.400	4~8
S20-M-800/6-NX2	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.630	6.000	4~8
S18-M-800/6-NX3	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.700	7.500	4~8
S22-M-1000/6-NX1	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.665	7.415	4~8
S20-M-1000/6-NX2	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.745	8.240	4~8
S18-M-1000/6-NX3	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.830	10.300	4~8
S22-M-1250/6-NX1	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.780	8.640	4~8
S20-M-1250/6-NX2	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.870	9.600	4~8
S18-M-1250/6-NX3	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.970	12.000	4~8
S22-M-1600/6-NX1	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.940	10.440	4~8
S20-M-1600/6-NX2	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.050	11.600	4~8
S18-M-1600/6-NX3	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.170	14.500	4~8
S22-M-2000/6-NX1	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.085	13.180	4~8
S20-M-2000/6-NX2	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.225	14.640	4~8
S18-M-2000/6-NX3	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.360	18.300	4~8
Note： 1.±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 renewable energy transformers (PV, wind, energy storage). 5.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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S22-M-500/6-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

6kV Oil-Immersed Renewable Energy Transformer Series

S22-M-500/6-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer