Oil-Immersed Transformer

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S11-M oil-immersed power-transformer

S20-M Oil-Immersed Power Transformer


S20-M series sealed oil-immersed transformers are high-efficiency, energy-saving power distribution equipment with fully sealed structure, low loss, low noise, and maintenance-free design. They are widely used in urban and rural power grids, industrial and mining enterprises, commercial buildings, and various power distribution systems.
Adopting high-quality silicon steel sheets and advanced technique, the no-load loss is greatly reduced. The fully sealed structure isolates the transformer oil from air, preventing moisture and oxidation, effectively extending service life and ensuring stable and safe operation for a long time.
This series complies with GB/T 6451, GB/T 1094, IEC 60076 and other international and domestic standards, with strong short-circuit resistance, low temperature rise, and reliable performance.
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Model: S20-M-□/□
SymbolMeaning
SThree-phase
20Performance design serial number
MFully sealed structure
First □Rated capacity (kVA)
Second □Voltage class (kV)

Product Features


1. High Efficiency & Low Loss
Optimized core and coil design, lower no-load loss and load loss, obvious energy-saving effect.
2. Fully Sealed & Maintenance-Free
Corrugated tank or sealed structure, no oil replacement, no maintenance required during service life.
3. Strong Short-Circuit Withstand Ability
Reinforced winding structure, excellent mechanical strength, can withstand short-circuit impact.
4. Low Noise & Stable Operation
Low noise design, reliable insulation, long service life, suitable for outdoor long-term operation.
5. Wide Application Range
Suitable for 10kV, 35kV power distribution systems, urban grid, industrial and mining, infrastructure and other fields.

Operating Condition

Item Specification
Altitude ≤ 1000m
Ambient temperature -25℃ ~ +40℃
Installation Outdoor / indoor
Frequency 50Hz / 60Hz

Technical Parameters

S20-M 10kV Series Oil-Immersed Transformer Full Technical Parameters
ModelHigh Voltage(kV)Tap RangeLow Voltage(kV)Vector GroupNo-load Loss(W)Load Loss(Dyn11/Yzn11, W)Load Loss(Yyn0, W)No-load Current(%)Impedance(%)
S20-M-3010±2×2.5% / ±5%0.4Dyn11 / Yyn0705054801.54.0
S20-M-5010±2×2.5% / ±5%0.4Dyn11 / Yyn0907306951.34.0
S20-M-6310±2×2.5% / ±5%0.4Dyn11 / Yyn01008708301.24.0
S20-M-8010±2×2.5% / ±5%0.4Dyn11 / Yyn0115105010001.14.0
S20-M-10010±2×2.5% / ±5%0.4Dyn11 / Yyn0135126512001.14.0
S20-M-12510±2×2.5% / ±5%0.4Dyn11 / Yyn0150151014401.14.0
S20-M-16010±2×2.5% / ±5%0.4Dyn11 / Yyn0180185017601.04.0
S20-M-20010±2×2.5% / ±5%0.4Dyn11 / Yyn0215218520801.04.0
S20-M-25010±2×2.5% / ±5%0.4Dyn11 / Yyn0260256024400.94.0
S20-M-31510±2×2.5% / ±5%0.4Dyn11 / Yyn0305306529200.94.0
S20-M-40010±2×2.5% / ±5%0.4Dyn11 / Yyn0370361534400.84.0
S20-M-50010±2×2.5% / ±5%0.4Dyn11 / Yyn0430433041200.84.0
S20-M-63010±2×2.5% / ±5%0.4Dyn11 / Yyn05104960–0.64.5
S20-M-80010±2×2.5% / ±5%0.4Dyn11 / Yyn06306000–0.64.5
S20-M-100010±2×2.5% / ±5%0.4Dyn11 / Yyn07458240–0.64.5
S20-M-125010±2×2.5% / ±5%0.4Dyn11 / Yyn08709600–0.54.5
S20-M-160010±2×2.5% / ±5%0.4Dyn11 / Yyn0105011600–0.54.5
S20-M-200010±2×2.5% / ±5%0.4Dyn11 / Yyn0122514640–0.45.0
S20-M-250010±2×2.5% / ±5%0.4Dyn11 / Yyn0144014840–0.45.0

Outline dimension & Install Dimension

S13-M oil-immersed power transformer appearance and installation dimensions

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