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SZ22-10000/110-NX1 Three-Phase Oil-Immersed On-Load Tap-Changer Power Transformer

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110kV Oil-Immersed Power Transformer Series

SZ22-10000/110-NX1 Three-Phase Oil-Immersed On-Load Tap-Changer Power Transformer

The SZ22-10000/110-NX1 is a three-phase, two-winding oil-immersed power transformer with an on-load tap changer, rated at 10000kVA and 110kV on the high-voltage side. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers low no-load and load losses, reducing long-term operating costs. The integrated on-load tap changer (OLTC) enables voltage regulation without interrupting power supply, making it suitable for grids with frequent voltage fluctuations. The transformer features ONAN cooling, low partial discharge, low temperature rise, and high resistance to short circuits and lightning impulses. With a design life of up to 40 years, it is engineered for reliable, maintenance-friendly operation. Typical applications include utility substations, industrial facilities, renewable energy projects, and critical infrastructure where stable voltage and high efficiency are essential.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 10000 kVA
  • Rated Voltage Ratio: 110/10.5 kV
  • Connection Group: YNd11
  • Cooling Method: ONAN
  • Energy Efficiency Class: NX1
  • Standard：IEC 60076, GB/T 6451-2023
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Product Details

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Product Model SZ22-10000/110-NX1
No-Load Loss ≤6.2 kW
Rated Capacity 10000 kVA
No-Load Current ≤0.47%
Phase 3-phase
Load Loss (75°C) ≤45 kW
Rated Voltage Ratio 110/10.5 kV
Short-Circuit Impedance 10.5%
HV Tapping Range ±8×1.25%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤60 dB(A)
Connection Group YNd11
Protection Degree IP54
Cooling Method ONAN
Standard IEC 60076, GB/T 6451-2023
Insulation Class A, 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 5.8 kW and load loss of 43.0 kW meeting the highest efficiency limits for 110kV/10000kVA power transformers. Significantly reduces long-term operating costs.
On-Load Tap Changer (OLTC)
Equipped with an integrated on-load tap changer, the transformer regulates voltage without interrupting power supply. Ideal for grids with frequent voltage fluctuations and critical load applications.
High Reliability & Long Service Life
Optimized core and winding design with robust oil-immersed structure ensures low partial discharge, low temperature rise, no leakage, and strong short-circuit and lightning impulse withstand capability. Service life up to 40 years
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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110kV Oil-Immersed Power Transformer Series – Full Specifications

110kV, 3-phase, 2-winding, oil-immersed, on-load tap-changer, power transformer, 6300-63000kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss
(75°C) (kW)		Impedance
Voltage (%)
SZ22-6300/110-NX16300110±8×1.25%6.3, 6.6, 10.5, 21YNd114.432.010.5
SZ20-6300/110-NX26300110±8×1.25%6.3, 6.6, 10.5, 21YNd115.232.010.5
SZ18-6300/110-NX36300110±8×1.25%6.3, 6.6, 10.5, 21YNd116.433.010.5
SZ22-8000/110-NX18000110±8×1.25%6.3, 6.6, 10.5, 21YNd115.338.010.5
SZ20-8000/110-NX28000110±8×1.25%6.3, 6.6, 10.5, 21YNd116.238.010.5
SZ18-8000/110-NX38000110±8×1.25%6.3, 6.6, 10.5, 21YNd117.740.010.5
SZ22-10000/110-NX110000110±8×1.25%6.3, 6.6, 10.5, 21YNd116.245.010.5
SZ20-10000/110-NX210000110±8×1.25%6.3, 6.6, 10.5, 21YNd117.345.010.5
SZ18-10000/110-NX310000110±8×1.25%6.3, 6.6, 10.5, 21YNd119.048.010.5
SZ22-12500/110-NX112500110±8×1.25%6.3, 6.6, 10.5, 21YNd117.453.010.5
SZ20-12500/110-NX212500110±8×1.25%6.3, 6.6, 10.5, 21YNd118.753.010.5
SZ18-12500/110-NX312500110±8×1.25%6.3, 6.6, 10.5, 21YNd1110.756.010.5
SZ22-16000/110-NX116000110±8×1.25%6.3, 6.6, 10.5, 21YNd118.966.010.5
SZ20-16000/110-NX216000110±8×1.25%6.3, 6.6, 10.5, 21YNd1110.566.010.5
SZ18-16000/110-NX316000110±8×1.25%6.3, 6.6, 10.5, 21YNd1112.969.010.5
SZ22-20000/110-NX120000110±8×1.25%6.3, 6.6, 10.5, 21YNd1110.679.010.5
SZ20-20000/110-NX220000110±8×1.25%6.3, 6.6, 10.5, 21YNd1112.579.010.5
SZ18-20000/110-NX320000110±8×1.25%6.3, 6.6, 10.5, 21YNd1115.484.010.5
SZ22-25000/110-NX125000110±8×1.25%6.3, 6.6, 10.5, 21YNd1112.594.010.5
SZ20-25000/110-NX225000110±8×1.25%6.3, 6.6, 10.5, 21YNd1114.894.010.5
SZ18-25000/110-NX325000110±8×1.25%6.3, 6.6, 10.5, 21YNd1118.299.010.5
SZ22-31500/110-NX131500110±8×1.25%6.3, 6.6, 10.5, 21YNd1114.9111.010.5
SZ20-31500/110-NX231500110±8×1.25%6.3, 6.6, 10.5, 21YNd1117.6111.010.5
SZ18-31500/110-NX331500110±8×1.25%6.3, 6.6, 10.5, 21YNd1121.6117.010.5
SZ22-40000/110-NX140000110±8×1.25%6.3, 6.6, 10.5, 21YNd1117.8140.010.5~18
SZ20-40000/110-NX240000110±8×1.25%6.3, 6.6, 10.5, 21YNd1121.0140.010.5~18
SZ18-40000/110-NX340000110±8×1.25%6.3, 6.6, 10.5, 21YNd1125.8148.010.5~18
SZ22-50000/110-NX150000110±8×1.25%6.3, 6.6, 10.5, 21YNd1121.0175.010.5~18
SZ20-50000/110-NX250000110±8×1.25%6.3, 6.6, 10.5, 21YNd1124.8175.010.5~18
SZ18-50000/110-NX350000110±8×1.25%6.3, 6.6, 10.5, 21YNd1130.6184.010.5~18
SZ22-63000/110-NX163000110±8×1.25%6.3, 6.6, 10.5, 21YNd1125.0209.010.5~18
SZ20-63000/110-NX263000110±8×1.25%6.3, 6.6, 10.5, 21YNd1129.5209.010.5~18
SZ18-63000/110-NX363000110±8×1.25%6.3, 6.6, 10.5, 21YNd1136.3220.010.5~18
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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