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S18-M-500/35 Three-Phase Oil-Immersed Hermetically Sealed Power Transformer

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35kV Oil-Immersed Distribution Transformer Series

S18-M-500/35 Three-Phase Oil-Immersed Hermetically Sealed Power Transformer

The S18-M-500/35 is a three-phase oil-immersed fully sealed distribution transformer with a rated capacity of 500kVA and a high-voltage side rating of 35kV. The transformer features a fully sealed tank structure that isolates the transformer oil from air, effectively delaying insulation aging. It adopts ONAN (Oil Natural Air Natural) cooling, ensuring reliable heat dissipation under natural oil circulation and air convection. The core is made of high-quality cold-rolled silicon steel, and both high and low voltage windings use oxygen-free copper conductors. The product is designed with S18 loss level, complying with GB/T 6451-2023 technical requirements for 35kV distribution transformers. It is suitable for 35kV distribution systems, providing reliable power supply for substations, industrial and mining enterprises, and power transmission applications.
Industrial & CommercialUtility & Grid
  • Core parameters
  • Rated Capacity: 500 kVA
  • Rated Voltage Ratio: 35/0.4 kV
  • Connection Group: Dyn11
  • Cooling Method: ONAN
  • Energy Efficiency Class: N/A
  • Standard：IEC 60076, GB/T 6451-2023
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Product Details

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Product Model S18-M-500/35
No-Load Loss ≤0.545 kW
Rated Capacity 500 kVA
No-Load Current ≤0.68%
Phase 3-phase
Load Loss (75°C) ≤6.56 kW
Rated Voltage Ratio 35/0.4 kV
Short-Circuit Impedance 6.5%
HV Tapping Range ±2×2.5%
Temperature Rise Limit Top oil ≤55K, Winding ≤65K
Rated Frequency 50 Hz
Noise (Sound Pressure Level) ≤55 dB(A)
Connection Group Dyn11 (Yyn0 available upon request)
Protection Degree IP54
Cooling Method ONAN
Standard IEC 60076, GB/T 6451-2023
Insulation Class A, LI170 AC70 / AC5
Energy Efficiency Class N/A
01.

Core advantages

Low Loss Design (S18 Level)
Optimized core and coil design achieves low no-load and load losses, complying with GB/T 6451-2023 technical requirements for 35kV distribution transformers.
Fully Sealed Structure
Fully sealed tank isolates transformer oil from air, slows down insulation aging, and extends service life with minimal maintenance.
High Efficiency & Low Noise
Optimized core and coil design ensures low no-load loss and quiet operation, suitable for substations, industrial and mining enterprises, and power transmission applications.
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 Distribution Transformer Series – Full Specifications

35kV, 3-phase, 2-winding, oil-immersed, 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
(75°C) (kW)		Impedance
Voltage (%)
S18-M-50/355035±5%0.4Dyn110.1301.1406.5
S20-M-50/355035±5%0.4Dyn110.1041.0836.5
S22-M-50/355035±5%0.4Dyn110.0911.0836.5
S18-M-100/3510035±5%0.4Dyn110.1851.9106.5
S20-M-100/3510035±5%0.4Dyn110.1481.8156.5
S22-M-100/3510035±5%0.4Dyn110.1301.8156.5
S18-M-125/3512535±5%0.4Dyn110.2152.2506.5
S20-M-125/3512535±5%0.4Dyn110.1722.1386.5
S22-M-125/3512535±5%0.4Dyn110.1512.1386.5
S18-M-160/3516035±5%0.4Dyn110.2252.6806.5
S20-M-160/3516035±5%0.4Dyn110.1802.5466.5
S22-M-160/3516035±5%0.4Dyn110.1582.5466.5
S18-M-200/3520035±5%0.4Dyn110.2703.1506.5
S20-M-200/3520035±5%0.4Dyn110.2162.9936.5
S22-M-200/3520035±5%0.4Dyn110.1892.9936.5
S18-M-250/3525035±5%0.4Dyn110.3203.7506.5
S20-M-250/3525035±5%0.4Dyn110.2563.5636.5
S22-M-250/3525035±5%0.4Dyn110.2243.5636.5
S18-M-315/3531535±5%0.4Dyn110.3854.5106.5
S20-M-315/3531535±5%0.4Dyn110.3084.2856.5
S22-M-315/3531535±5%0.4Dyn110.2704.2856.5
S18-M-400/3540035±5%0.4Dyn110.4655.4506.5
S20-M-400/3540035±5%0.4Dyn110.3725.1786.5
S22-M-400/3540035±5%0.4Dyn110.3265.1786.5
S18-M-500/3550035±5%0.4Dyn110.5456.5606.5
S20-M-500/3550035±5%0.4Dyn110.4366.2326.5
S22-M-500/3550035±5%0.4Dyn110.3826.2326.5
S18-M-630/3563035±5%0.4Dyn110.6657.4706.5
S20-M-630/3563035±5%0.4Dyn110.5327.0976.5
S22-M-630/3563035±5%0.4Dyn110.4667.0976.5
S18-M-800/3580035±5%0.4Dyn110.7858.9306.5
S20-M-800/3580035±5%0.4Dyn110.6288.4846.5
S22-M-800/3580035±5%0.4Dyn110.5508.4846.5
S18-M-1000/35100035±5%0.4Dyn110.92010.9006.5
S20-M-1000/35100035±5%0.4Dyn110.73610.3556.5
S22-M-1000/35100035±5%0.4Dyn110.64410.3556.5
S18-M-1250/35125035±5%0.4Dyn111.12013.2006.5
S20-M-1250/35125035±5%0.4Dyn110.89612.5406.5
S22-M-1250/35125035±5%0.4Dyn110.78412.5406.5
S18-M-1600/35160035±5%0.4Dyn111.35015.8006.5
S20-M-1600/35160035±5%0.4Dyn111.08015.0106.5
S22-M-1600/35160035±5%0.4Dyn110.94515.0106.5
S18-M-2000/35200035±5%0.4Dyn111.59019.7006.5
S20-M-2000/35200035±5%0.4Dyn111.27218.7156.5
S22-M-2000/35200035±5%0.4Dyn111.11318.7156.5
S18-M-2500/35250035±5%0.4Dyn111.89023.2006.5
S20-M-2500/35250035±5%0.4Dyn111.51222.0406.5
S22-M-2500/35250035±5%0.4Dyn111.32322.0406.5
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.Other vector groups (e.g., Yyn0, Yzn11) 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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