SFS22-150000/220-NX1 - TAIXUANTECH

SFS22-150000/220-NX1 Three-Phase Three-Winding Oil-Immersed Forced-Air-Cooled Off-Circuit Tap-Changer Power Transformer

220kV Oil-Immersed Power Transformer Series

SFS22-150000/220-NX1 Three-Phase Three-Winding Oil-Immersed Forced-Air-Cooled Off-Circuit Tap-Changer Power Transformer

The SFS22-150000/220-NX1 is a three-phase, three-winding oil-immersed power transformer with forced-air cooling (ONAF), rated at 150000kVA and 220kV on the high-voltage side. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers no-load loss of 55 kW and load loss of 438 kW, significantly reducing long-term operating costs. The three-winding configuration allows simultaneous output of two different voltage levels (e.g., 121kV and 10.5kV), making it ideal for 220kV substations and large industrial facilities that need to supply two voltage networks. The transformer features a robust oil-immersed structure with ONAN/ONAF cooling, ensuring reliable heat dissipation under heavy-load conditions. The core is made of high-quality cold-rolled grain-oriented silicon steel, and windings use oxygen-free copper conductors, offering low partial discharge, low temperature rise, and strong short-circuit withstand capability. Typical applications include utility substations, large industrial parks, and regional power grids where high efficiency and reliable multi-voltage output are essential.

Industrial & Commercial Utility & Grid

Rated Capacity: 150000 kVA
Rated Voltage Ratio: 220/110/10.5 kV
Connection Group: YNyn0d11
Cooling Method: ONAF
Energy Efficiency Class: NX1
Standard：IEC 60076, GB/T 6451-2023

Product Details

Learn more about our products

Product Model SFS22-150000/220-NX1

No-Load Loss ≤55 kW

Rated Capacity 150000 kVA

No-Load Current ≤0.26%

Phase 3-phase

Load Loss (75°C) ≤438 kW

Rated Voltage Ratio 220/110/10.5 kV

Short-Circuit Impedance H-M: 12~14% / H-L: 22~24% / M-L: 7~9%

HV Tapping Range ±2×2.5%

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

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤75 dB(A)

Connection Group YNyn0d11

Protection Degree IP54

Cooling Method ONAF

Standard IEC 60076, GB/T 6451-2023

Insulation Class A, LI950 AC395 / LI480 AC200 / LI75 AC35

Energy Efficiency Class NX1

01.

Core advantages

Class 1 Energy Efficiency (NX1)

Complies with GB 20052-2024 Class 1 energy efficiency standard, with no-load loss of 55 kW and load loss of 438 kW. Compared with lower efficiency grades, the annual energy savings are substantial, and the incremental investment typically pays back within a few years under continuous heavy-load operation.

Three-Winding Design

The three-winding configuration allows simultaneous output of two different voltage levels (e.g., 121kV and 10.5kV), making it ideal for 220kV substations and large industrial facilities that need to supply two voltage networks. This reduces the number of transformers required and lowers overall project cost.

ONAF Cooling & High Reliability

Equipped with ONAF (Oil Natural Air Forced) cooling, the transformer maintains stable temperature rise under heavy-load conditions. Optimized core and winding design, combined with a robust oil-immersed structure, ensures strong short-circuit withstand capability and long service life.

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

220kV Oil-Immersed Power Transformer Series – Full Specifications

220kV, 3-phase, 3-winding, oil-immersed, off-circuit tap-changer, power transformer, 31500-300000kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	MV (kV)	LV (kV)	Vector Group	No-Load Loss (W)	Load Loss (75°C) (W)	Impedance Voltage (Step-down )% (H-M / H-L / M-L)	Impedance Voltage (Step-up )% (H-M / H-L / M-L)
SFS22-31500/220-NX1	31500	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	18	138	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-31500/220-NX2	31500	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	21	138	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-31500/220-NX3	31500	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	26	145	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-40000/220-NX1	40000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	21	165	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-40000/220-NX2	40000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	25	165	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-40000/220-NX3	40000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	30	174	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-50000/220-NX1	50000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	24	194	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-50000/220-NX2	50000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	29	194	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-50000/220-NX3	50000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	35	205	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-63000/220-NX1	63000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	29	231	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-63000/220-NX2	63000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	34	231	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-63000/220-NX3	63000	220, 230, 242	±2×2.5%	69, 115, 121	6.3, 6.6, 10.5, 21, 36, 37, 38.5	YNyn0d11	42	244	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-90000/220-NX1	90000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	37	300	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-90000/220-NX2	90000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	44	300	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-90000/220-NX3	90000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	54	316	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-120000/220-NX1	120000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	46	369	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-120000/220-NX2	120000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	55	369	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-120000/220-NX3	120000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 21, 36, 37, 38.5	YNyn0d11	67	390	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-150000/220-NX1	150000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	55	438	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-150000/220-NX2	150000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	65	438	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-150000/220-NX3	150000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	80	463	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-180000/220-NX1	180000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	62	500	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-180000/220-NX2	180000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	73	500	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-180000/220-NX3	180000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	90	527	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-240000/220-NX1	240000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	72	616	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-240000/220-NX2	240000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	91	616	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-240000/220-NX3	240000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	112	650	12~14/22~24/7~9	22~24/12~14/7~9
SFS22-300000/220-NX1	300000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	91	726	12~14/22~24/7~9	22~24/12~14/7~9
SFS20-300000/220-NX2	300000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	108	726	12~14/22~24/7~9	22~24/12~14/7~9
SFS18-300000/220-NX3	300000	220, 230, 242	±2×2.5%	69, 115, 121	10.5, 13.8, 15.75, 21, 36, 37，38.5	YNyn0d11	133	767	12~14/22~24/7~9	22~24/12~14/7~9
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, medium, 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. 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

SFS22-150000/220-NX1 Three-Phase Three-Winding Oil-Immersed Forced-Air-Cooled Off-Circuit Tap-Changer Power Transformer

220kV Oil-Immersed Power Transformer Series

SFS22-150000/220-NX1 Three-Phase Three-Winding Oil-Immersed Forced-Air-Cooled Off-Circuit Tap-Changer Power Transformer