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SBH21-M-2500/35 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer

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35kV Oil-Immersed Amorphous Alloy Distribution Transformer Series

SBH21-M-2500/35 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer

The SBH21-M-2500/35 is a three-phase, two-winding oil-immersed distribution transformer with a fully sealed corrugated tank, an amorphous alloy core, and an off-circuit tap changer, rated at 2500kVA and 35kV on the high-voltage side. Its amorphous alloy core delivers exceptionally low no-load loss, making it a cost-effective choice for energy-efficient distribution networks. 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 amorphous alloy core is made of high-quality ultra-thin alloy strips with a wound core structure, three-phase five-column type. Low-voltage windings use oxygen-free copper conductors, ensuring low partial discharge, low temperature rise, and strong short-circuit withstand capability. Vacuum oil filling ensures stable insulation performance. Typical applications include utility distribution networks, industrial facilities, commercial buildings, and renewable energy projects where high efficiency and reliable power supply are essential.
Industrial & CommercialRenewable EnergyUtility & Grid
  • Core parameters
  • Rated Capacity: 2500 kVA
  • Rated Voltage Ratio: 35/0.4 kV
  • Connection Group: Dyn11
  • Cooling Method: ONAN
  • Energy Efficiency Class: NA
  • Standard：IEC 60076, GB/T 25446-2010
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Product Details

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Product Model SBH21-M-2500/35
No-Load Loss ≤1.28 kW
Rated Capacity 2500 kVA
No-Load Current ≤0.4%
Phase Three-phase
Load Loss (120°C) ≤22.135 kW
Rated Voltage Ratio 35/0.4 kV
Short-Circuit Impedance 6.5%
HV Tapping Range ±5%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤55 dB(A)
Connection Group Dyn11
Protection Degree IP65
Cooling Method ONAN
Standard IEC 60076, GB/T 25446-2010
Insulation Class A, LI170 AC70 / AC5
Energy Efficiency Class N/A
01.

Core advantages

Ultra-Low No-Load Loss
The amorphous alloy core reduces no-load loss by approximately 70–80% compared with conventional S11 silicon steel transformers. This advantage is most pronounced in continuous light-load applications such as rural distribution networks and renewable energy projects. Actual measured losses are typically lower than reference values, and detailed test data can be provided upon request.
Fully Sealed Structure
The transformer adopts a fully sealed corrugated tank structure with vacuum oil filling, which isolates the transformer oil from air and prevents oxidation and moisture ingress. The corrugated fins serve as cooling elements, accommodating oil volume expansion and contraction. This design requires no routine maintenance, effectively extending the transformer's service life and reducing operational costs.
Low Noise & Strong Short-Circuit Withstand
The amorphous alloy core's magnetostriction effect is smaller than that of silicon steel, resulting in lower noise than conventional transformers. Low-voltage foil-wound windings provide strong short-circuit withstand capability. The transformer maintains stable operation under continuous load with low temperature rise and high reliability.
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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35kV Oil-Immersed Amorphous Alloy Distribution Transformer Series – Full Specifications

35kV, 3-phase, 2-winding, oil-immersed, amorphous alloy core, off-circuit tap-changer, distribution transformer, 50-2500kVA

ModelRated Capacity
(kVA)		HV (kV)HV Tapping
Range		LV (kV)Vector GroupNo-Load Loss
(kW)		Load Loss (kW)Impedance
Voltage (%)
SBH15-M-50/355035±5%0.4Dyn110.0851.2106.5
SBH21-M-50/355035±5%0.4Dyn110.0851.1506.5
SBH25-M-50/355035±5%0.4Dyn110.0771.0296.5
SBH15-M-100/3510035±5%0.4Dyn110.1202.0106.5
SBH21-M-100/3510035±5%0.4Dyn110.1201.9106.5
SBH25-M-100/3510035±5%0.4Dyn110.1081.7096.5
SBH15-M-125/3512535±5%0.4Dyn110.1352.3706.5
SBH21-M-125/3512535±5%0.4Dyn110.1352.2526.5
SBH25-M-125/3512535±5%0.4Dyn110.1222.0156.5
SBH15-M-160/3516035±5%0.4Dyn110.1502.8206.5
SBH21-M-160/3516035±5%0.4Dyn110.1502.6796.5
SBH25-M-160/3516035±5%0.4Dyn110.1352.3976.5
SBH15-M-200/3520035±5%0.4Dyn110.1753.3206.5
SBH21-M-200/3520035±5%0.4Dyn110.1753.1546.5
SBH25-M-200/3520035±5%0.4Dyn110.1582.8226.5
SBH15-M-250/3525035±5%0.4Dyn110.2053.9506.5
SBH21-M-250/3525035±5%0.4Dyn110.2053.7536.5
SBH25-M-250/3525035±5%0.4Dyn110.1853.3586.5
SBH15-M-315/3531535±5%0.4Dyn110.2454.7606.5
SBH21-M-315/3531535±5%0.4Dyn110.2454.5226.5
SBH25-M-315/3531535±5%0.4Dyn110.2214.0466.5
SBH15-M-400/3540035±5%0.4Dyn110.2955.7506.5
SBH21-M-400/3540035±5%0.4Dyn110.2955.4636.5
SBH25-M-400/3540035±5%0.4Dyn110.2664.8886.5
SBH15-M-500/3550035±5%0.4Dyn110.3456.9206.5
SBH21-M-500/3550035±5%0.4Dyn110.3456.5746.5
SBH25-M-500/3550035±5%0.4Dyn110.3115.8826.5
SBH15-M-630/3563035±5%0.4Dyn110.4207.8706.5
SBH21-M-630/3563035±5%0.4Dyn110.4207.4776.5
SBH25-M-630/3563035±5%0.4Dyn110.3786.6906.5
SBH15-M-800/3580035±5%0.4Dyn110.5009.4006.5
SBH21-M-800/3580035±5%0.4Dyn110.5008.9306.5
SBH25-M-800/3580035±5%0.4Dyn110.4507.9906.5
SBH15-M-1000/35100035±5%0.4Dyn110.59011.5406.5
SBH21-M-1000/35100035±5%0.4Dyn110.59010.9636.5
SBH25-M-1000/35100035±5%0.4Dyn110.5319.8096.5
SBH15-M-1250/35125035±5%0.4Dyn110.71013.9406.5
SBH21-M-1250/35125035±5%0.4Dyn110.71013.2436.5
SBH25-M-1250/35125035±5%0.4Dyn110.63911.8496.5
SBH15-M-1600/35160035±5%0.4Dyn110.85016.6706.5
SBH21-M-1600/35160035±5%0.4Dyn110.85015.8376.5
SBH25-M-1600/35160035±5%0.4Dyn110.76514.1706.5
SBH15-M-2000/35200035±5%0.4Dyn111.09019.7106.5
SBH21-M-2000/35200035±5%0.4Dyn111.09018.7256.5
SBH25-M-2000/35200035±5%0.4Dyn110.98116.7546.5
SBH15-M-2500/35250035±5%0.4Dyn111.28023.3006.5
SBH21-M-2500/35250035±5%0.4Dyn111.28022.1356.5
SBH25-M-2500/35250035±5%0.4Dyn111.15219.8056.5
Note：
1.Tapping range options: ±5% or ±2×2.5%. ±5% is shown as default in this table. Other tapping ranges are available upon request.
2.Other high and low voltages are available upon request.
3.Vector group options: Dyn11 or Yyn0. Other vector groups are available upon request.
4.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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