S22-M-3150/35-NX1 - TAIXUANTECH

S22-M-3150/35-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

35kV Oil-Immersed Renewable Energy Transformer Series

S22-M-3150/35-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

The S22-M-3150/35-NX1 is a three-phase, two-winding oil-immersed power transformer with a fully sealed corrugated tank and an off-circuit tap changer, rated at 3150kVA and 35kV on the high-voltage side. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers exceptionally low no-load and load losses, making it a leading choice for 35kV substations and renewable energy integration projects. 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, and windings use oxygen-free copper conductors. With IP55 protection and a wide operating temperature range from -25°C to +45°C, it is engineered for harsh environments and impact load scenarios typical in new energy power stations.

Industrial & Commercial Renewable Energy Utility & Grid

Rated Capacity: 3150 kVA
Rated Voltage Ratio: 35~38.5 / 0.4-1.14 kV
Connection Group: Yd11
Cooling Method: ONAN
Energy Efficiency Class: NX1
Standard：IEC 60076, GB/T 6451-2023, GB 20052-2024

Product Details

Learn more about our products

Product Model S22-M-3150/35-NX1

No-Load Loss ≤1.7 kW

Rated Capacity 3150 kVA

No-Load Current ≤0.36%

Phase Three-phase

Load Loss (120°C) ≤20.7 kW

Rated Voltage Ratio 35~38.5/0.4~1.14 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) ≤60 dB(A)

Connection Group Yd11

Protection Degree IP55

Cooling Method ONAN

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

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. Compared with lower efficiency grades, the transformer delivers exceptionally low no-load and load losses, ensuring minimum lifecycle cost. For 35kV substations and renewable energy sites that operate continuously, the energy savings over the 20+ year service life are substantial. Actual measured losses are typically lower than the standard limits; detailed test reports are available upon request.

Fully Sealed & Wide-Temperature Adaptability

Fully sealed corrugated tank with vacuum oil filling isolates oil from air, preventing oxidation and moisture ingress. IP55 protection resists dust and water jets, while the enhanced insulation system ensures reliable operation from -25°C to +45°C, suitable for desert, coastal, and high-altitude renewable energy sites.

Strong Short-Circuit Withstand for Grid Stability

Constructed with high-quality cold-rolled silicon steel cores and robust winding support, the transformer offers strong short-circuit resistance, making it ideal for the impact load scenarios common in new energy power stations (PV, wind, storage) and for 35kV substation main transformer applications.

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

35kV Oil-Immersed Renewable Energy Transformer Series – Full Specifications

35kV, 3-phase, 2-winding, oil-immersed, off-circuit tap-changer, renewable energy transformer, 35-38.5kV / 0.4-1.14kV, 1000-12500kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	Load Loss (kW)	Impedance Voltage (%)
S22-M-1000/35-NX1	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.600	10.400	6~14
S20-M-1000/35-NX2	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.800	10.400	6~14
S18-M-1000/35-NX3	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.900	10.900	6~14
S22-M-1250/35-NX1	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.800	12.500	6~14
S20-M-1250/35-NX2	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.900	12.500	6~14
S18-M-1250/35-NX3	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.100	13.200	6~14
S22-M-1600/35-NX1	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	0.900	14.900	6~14
S20-M-1600/35-NX2	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.100	14.900	6~14
S18-M-1600/35-NX3	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.300	15.800	6~14
S22-M-2000/35-NX1	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.200	16.500	6~14
S20-M-2000/35-NX2	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.400	16.500	6~14
S18-M-2000/35-NX3	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.500	17.400	6~14
S22-M-2500/35-NX1	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.400	17.600	6~14
S20-M-2500/35-NX2	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.700	17.600	6~14
S18-M-2500/35-NX3	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.800	19.600	6~14
S22-M-3000/35-NX1	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.600	20.300	6~14
S20-M-3000/35-NX2	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.900	20.300	6~14
S18-M-3000/35-NX3	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.100	22.500	6~14
S22-M-3150/35-NX1	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	1.700	20.700	6~14
S20-M-3150/35-NX2	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.000	20.700	6~14
S18-M-3150/35-NX3	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.200	23.000	6~14
S22-M-4000/35-NX1	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.000	24.600	6~14
S20-M-4000/35-NX2	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.300	24.600	6~14
S18-M-4000/35-NX3	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.600	27.300	6~14
S22-M-4500/35-NX1	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.200	27.100	6~14
S20-M-4500/35-NX2	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.600	27.100	6~14
S18-M-4500/35-NX3	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.000	30.100	6~14
S22-M-5000/35-NX1	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.400	28.200	6~14
S20-M-5000/35-NX2	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.800	28.200	6~14
S18-M-5000/35-NX3	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.200	31.300	6~14
S22-M-5500/35-NX1	5500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.600	30.300	6~14
S20-M-5500/35-NX2	5500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.000	30.300	6~14
S18-M-5500/35-NX3	5500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.500	33.600	6~14
S22-M-6300/35-NX1	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	2.900	31.500	6~14
S20-M-6300/35-NX2	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.400	31.500	6~14
S18-M-6300/35-NX3	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Yd11	3.800	35.000	6~14
S22-M-8000/35-NX1	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	4.000	34.600	6~14
S20-M-8000/35-NX2	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	4.700	34.600	6~14
S18-M-8000/35-NX3	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	5.200	38.100	6~14
S22-M-10000/35-NX1	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	4.800	40.800	6~14
S20-M-10000/35-NX2	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	5.700	40.800	6~14
S18-M-10000/35-NX3	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	6.300	45.300	6~14
S22-M-12500/35-NX1	12500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	5.600	50.700	6~14
S20-M-12500/35-NX2	12500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	6.500	50.700	6~14
S18-M-12500/35-NX3	12500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	YNd11	7.200	56.300	6~14
Note： 1.±2×2.5% is shown as the default tapping range in this table. Other tapping ranges (e.g., ±5%) 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) of 500kVA and above. 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.

Contact information

Leave your contact information to download documents

S22-M-3150/35-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer

35kV Oil-Immersed Renewable Energy Transformer Series

S22-M-3150/35-NX1 Three-Phase Two-Winding Oil-Immersed Off-Circuit Tap-Changer Renewable Energy Transformer