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SFZ22-120000/220-NX1 Three-Phase Two-Winding Oil-Immersed Forced-Air-Cooled On-Load Tap-Changer Power Transformer

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220kV Oil-Immersed Power Transformer Series

SFZ22-120000/220-NX1 Three-Phase Two-Winding Oil-Immersed Forced-Air-Cooled On-Load Tap-Changer Power Transformer

The SFZ22-120000/220-NX1 is a three-phase, two-winding oil-immersed power transformer with forced-air cooling (ONAF) and an on-load tap changer, rated at 120000kVA and 220kV on the high-voltage side. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, its actual no-load and load losses are typically lower than the standard limits, depending on design and manufacturing. Detailed test data can be provided upon request. The integrated on-load tap changer (OLTC) enables voltage regulation without interrupting power supply, making it suitable for utility grids with frequent voltage fluctuations. The transformer features 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 facilities, and regional power transmission projects where high efficiency and stable voltage output are essential.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 120000 kVA
  • Rated Voltage Ratio: 220/ 10.5 kV
  • Connection Group: YNd11
  • Cooling Method: ONAF
  • Energy Efficiency Class: NX1
  • Standard：IEC 60076, GB/T 6451-2023
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Product Details

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Product Model SFZ22-120000/220-NX1
No-Load Loss ≤43 kW
Rated Capacity 120000 kVA
No-Load Current ≤0.36%
Phase 3-phase
Load Loss (75°C) ≤304 kW
Rated Voltage Ratio 220/10.5 kV
Short-Circuit Impedance 12~14%
HV Tapping Range ±8×1.25%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤75 dB(A)
Connection Group YNd11
Protection Degree IP54
Cooling Method ONAF
Standard IEC 60076, GB/T 6451-2023
Insulation Class A, LI950 AC395 / LI75 AC35
Energy Efficiency Class NX1
01.

Core advantages

Class 1 Energy Efficiency (NX1)
Complies with GB 20052-2024 Class 1 energy efficiency standard. Actual losses are typically lower than the standard limits, reducing long-term operating costs. Detailed test data available upon request.
On-Load Tap Changer (OLTC)
Equipped with an integrated on-load tap changer, the transformer regulates voltage without interrupting power supply. Ideal for utility grids with frequent voltage fluctuations and critical load applications where continuous power supply is essential.
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

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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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220kV Oil-Immersed Power Transformer Series – Full Specifications

220kV, 3-phase, 2-winding, oil-immersed, on-load tap-changer, power transformer, 31500-240000kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss
(75°C) (kW)		Impedance
Voltage (%)
SFZ22-31500/220-NX131500220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd111711512~14
SFZ20-31500/220-NX231500220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112011512~14
SFZ18-31500/220-NX331500220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112412212~14
SFZ22-40000/220-NX140000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112013412~14
SFZ20-40000/220-NX240000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112313412~14
SFZ18-40000/220-NX340000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112914212~14
SFZ22-50000/220-NX150000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112416112~14
SFZ20-50000/220-NX250000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112816112~14
SFZ18-50000/220-NX350000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd113417012~14
SFZ22-63000/220-NX163000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd112818812~14
SFZ20-63000/220-NX263000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd113318812~14
SFZ18-63000/220-NX363000220, 230±8×1.25%6.3, 6.6, 10.5, 21, 36, 37, 38.5YNd114019912~14
SFZ22-90000/220-NX190000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd113524612~14
SFZ20-90000/220-NX290000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd114224612~14
SFZ18-90000/220-NX390000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd115125912~14
SFZ22-120000/220-NX1120000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd114330412~14
SFZ20-120000/220-NX2120000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd115130412~14
SFZ18-120000/220-NX3120000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd116332112~14
SFZ22-150000/220-NX1150000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd115136012~14
SFZ20-150000/220-NX2150000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd116036012~14
SFZ18-150000/220-NX3150000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd117438012~14
SFZ22-180000/220-NX1180000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd115941312~14
SFZ20-180000/220-NX2180000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd117041312~14
SFZ18-180000/220-NX3180000220, 230±8×1.25%10.5, 21, 36, 37, 38.5YNd118643612~14
SFZ22-120000/220-NX1120000220, 230±8×1.25%66, 69YNd114530312~14
SFZ20-120000/220-NX2120000220, 230±8×1.25%66, 69YNd115330312~14
SFZ18-120000/220-NX3120000220, 230±8×1.25%66, 69YNd116532012~14
SFZ22-150000/220-NX1150000220, 230±8×1.25%66, 69YNd115335512~14
SFZ20-150000/220-NX2150000220, 230±8×1.25%66, 69YNd116235512~14
SFZ18-150000/220-NX3150000220, 230±8×1.25%66, 69YNd117737412~14
SFZ22-180000/220-NX1180000220, 230±8×1.25%66, 69YNd116240612~14
SFZ20-180000/220-NX2180000220, 230±8×1.25%66, 69YNd117340612~14
SFZ18-180000/220-NX3180000220, 230±8×1.25%66, 69YNd119042812~14
SFZ22-240000/220-NX1240000220, 230±8×1.25%66, 69YNd117750412~14
SFZ20-240000/220-NX2240000220, 230±8×1.25%66, 69YNd119150412~14
SFZ18-240000/220-NX3240000220, 230±8×1.25%66, 69YNd1111253212~14
Note：
1.±8×1.25% 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.
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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