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SS22-12500/110-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer

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110kV Oil-Immersed Power Transformer Series

SS22-12500/110-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer

The SS22-12500/110-NX1 is a three-phase three-winding oil-immersed off-circuit tap-changer power transformer with a rated capacity of 12500kVA and a high-voltage side rating of 110kV. It is designed with S22 loss level, achieving Class 1 energy efficiency (NX1) according to GB 20052-2024. The transformer features an oil-immersed structure with ONAN cooling, ensuring reliable heat dissipation and stable operation. The core is made of high-quality cold-rolled grain-oriented silicon steel, and windings use oxygen-free copper conductors. The three-winding configuration allows simultaneous output of two different voltage levels (38.5kV and 10.5kV), making it ideal for 110kV substations and industrial facilities that need to supply two voltage networks. It is suitable for step-down applications, providing reliable and energy-efficient power supply for substations, large industrial parks, and regional power grids.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 12500 kVA
  • Rated Voltage Ratio: 110/38.5/10.5 kV
  • Connection Group: YNyn0d11
  • 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 SS22-12500/110-NX1
No-Load Loss ≤8.1 kW
Rated Capacity 12500 kVA
No-Load Current ≤0.45%
Phase 3-phase
Load Loss (75°C) ≤67 kW
Rated Voltage Ratio 110/38.5/10.5 kV
Short-Circuit Impedance H-M: 10.5% / H-L: 17.5% / M-L: 6.5%
HV Tapping Range ±2×2.5%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤65 dB(A)
Connection Group YNyn0d11
Protection Degree IP54
Cooling Method ONAN
Standard IEC 60076, GB/T 6451-2023
Insulation Class A, LI480 AC200 / LI200 AC85 / LI75 AC35
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 of 8.1 kW and load loss of 67.0 kW meet the highest efficiency limits for 110kV three-winding power transformers, significantly reducing long-term operating costs.
Three-Winding Step-Down Design
The three-winding configuration allows simultaneous output of two different voltage levels (38.5kV and 10.5kV), making it ideal for 110kV substations and industrial facilities that need to supply two voltage networks. Optimized for step-down operation.
High Reliability & Strong Short-Circuit Withstand
Optimized core and winding design, combined with a robust oil-immersed structure, ensures stable operation under heavy loads with 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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110kV Oil-Immersed Power Transformer Series – Full Specifications

110kV, 3-phase, 3-winding, oil-immersed, off-circuit tap-changer, power transformer, 6300-63000kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		MV (kV)LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss
(75°C) (kW)		Impedance Voltage (Step-down )%
(H-M / H-L / M-L)		Impedance Voltage (Step-up )%
(H-M / H-L / M-L)
SS22-6300/110-NX16300110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d114.940.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-6300/110-NX26300110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d115.840.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-6300/110-NX36300110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d117.142.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-8000/110-NX18000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d115.848.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-8000/110-NX28000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d116.948.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-8000/110-NX38000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d118.550.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-10000/110-NX110000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d116.956.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-10000/110-NX210000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d118.256.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-10000/110-NX310000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1110.159.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-12500/110-NX112500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d118.167.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-12500/110-NX212500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d119.667.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-12500/110-NX312500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1111.870.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-16000/110-NX116000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d119.881.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-16000/110-NX216000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1111.681.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-16000/110-NX316000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1114.386.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-20000/110-NX120000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1111.695.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-20000/110-NX220000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1113.795.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-20000/110-NX320000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1116.9101.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-25000/110-NX125000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1113.5113.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-25000/110-NX225000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1116.0113.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-25000/110-NX325000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1119.7120.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-31500/110-NX131500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1116.2134.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-31500/110-NX231500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1119.1134.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-31500/110-NX331500110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1123.5142.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-40000/110-NX140000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1119.1161.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-40000/110-NX240000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1122.6161.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-40000/110-NX340000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1127.8170.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-50000/110-NX150000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1122.9192.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-50000/110-NX250000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1127.0192.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-50000/110-NX350000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1133.3202.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS22-63000/110-NX163000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1127.1230.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS20-63000/110-NX263000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1132.0230.010.5/17.5~19/6.517.5~18.5/10.5/6.5
SS18-63000/110-NX363000110, 115, 121±2×2.5%36, 37, 38.56.3, 6.6, 10.5, 21YNyn0d1139.4243.010.5/17.5~19/6.517.5~18.5/10.5/6.5
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.

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