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Wound Core Transformers Series Oil-Immersed Transformers
14 Models available
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Three-Dimensional Wound Core Transformers — S13/S20-M·RL Triangular Core
Three-dimensional wound core (triangular core) oil-immersed transformers use a continuously wound core forming a triangular (delta) magnetic circuit with no air gaps, giving lower no-load loss, lower noise and a more compact, lighter tank than conventional stacked-core designs. Rated 30–2500 kVA in S13/S20-M·RL grades, 6–35 kV primary, built to IEC 60076 for energy-saving distribution applications.
Key Features
- Triangular (3D) wound core with no air gaps in the magnetic circuit
- Lower no-load loss and lower noise than stacked-core designs
- S13 and S20-M·RL loss grades for energy saving
- Compact and lighter tank, reducing footprint and oil volume
- 30–2500 kVA, 6–35 kV primary, distribution voltages secondary
- Built to IEC 60076 distribution transformer requirements
Applications
- Energy-saving distribution networks
- Urban and industrial distribution
- Renewable plant step-up auxiliary supply
- Green building and low-noise installations
TECHNICAL DRAWING
Model: S13-M.RL-250/10 | Type: Oil-immersed transformer | Capacity: 250 kVA
FRONT ELEVATION
ELECTRICAL SCHEMATIC
EFFICIENCY vs LOAD
SIDE VIEW
TOP VIEW
TERMINAL BLOCK
CORE & WINDING
LEGEND:
Specifications Range
All specifications and dimensions can be customized upon request
Model Selector
| Key parameters | Model Range |
|---|---|
| Capacity | 30–1000 kVA |
| HV Voltage (kV) | 10 |
| LV Voltage (kV) | 0.4 |
| Frequency (Hz) | 50/60 |
| Impedance (%) | 4, 4.5, 6 |
| Cooling | ONAN |
| Efficiency | Class 1 |
| Standard | IEC 60076 |
| Connection | Dyn11 (IEC) |
| Insulation class | A (105°C) |
| Allowed temperature rise | 65 |
| Noise level | ≤34 dB(A), ≤35 dB(A), ≤37 dB(A), ≤38 dB(A), ≤39 dB(A), ≤40 dB(A)… |
| Tap Changer | ±2×2.5% Multi-tap, ±5×2.5% Multi-tap |
| No-load loss | 100–1150 W |
| Load loss | 600–10300 W |
| Compare | Model | Capacity (kVA) | HV Voltage (kV) | LV Voltage (kV) | Weight | Dimensions |
|---|---|---|---|---|---|---|
| S13-M.RL-30/10 | 30kVA | 10 | 0.4 | 188 kg | 1165×860×1415 mm | |
| S13-M.RL-50/10 | 50kVA | 10 | 0.4 | 225 kg | 1250×920×1510 mm | |
| S13-M.RL-80/10 | 80kVA | 10 | 0.4 | 277 kg | 1350×995×1635 mm | |
| S13-M.RL-100/10 | 100kVA | 10 | 0.4 | 310 kg | 1410×1040×1705 mm | |
| S13-M.RL-125/10 | 125kVA | 10 | 0.4 | 350 kg | 1480×1090×1790 mm | |
| S13-M.RL-160/10 | 160kVA | 10 | 0.4 | 403 kg | 1565×1155×1895 mm | |
| S13-M.RL-200/10 | 200kVA | 10 | 0.4 | 463 kg | 1660×1220×2005 mm | |
| S13-M.RL-250/10 | 250kVA | 10 | 0.4 | 534 kg | 1765×1300×2135 mm | |
| S13-M.RL-315/10 | 315kVA | 10 | 0.4 | 625 kg | 1890×1390×2285 mm | |
| S13-M.RL-400/10 | 400kVA | 10 | 0.4 | 738 kg | 2040×1500×2470 mm | |
| S13-M.RL-500/10 | 500kVA | 10 | 0.4 | 868 kg | 2200×1620×2665 mm | |
| S13-M.RL-630/10 | 630kVA | 10 | 0.4 | 1030 kg | 2395×1765×2900 mm | |
| S13-M.RL-800/10 | 800kVA | 10 | 0.4 | 1235 kg | 2625×1935×3180 mm | |
| S13-M.RL-1000/10 | 1000kVA | 10 | 0.4 | 1468 kg | 2875×2115×3480 mm |
Selection Guide
Loss grade
Choose S13 or S20 (lower loss) per the energy-efficiency target.
Noise
Select wound core where low noise is required near buildings.
Rating
Size 30–2500 kVA to the distribution load and voltage class.
- Frequently Asked Questions
What is a three-dimensional wound core transformer?
A 3D wound core (triangular core) transformer uses three continuously wound core limbs arranged in a triangle, eliminating the air gaps of stacked cores and reducing no-load loss, noise and size.
What do the S13/S20-M·RL designations mean?
S13 and S20 are Chinese loss grades (S20 is lower-loss); M·RL denotes a three-dimensional wound core oil-immersed distribution transformer.
What are the advantages over stacked core?
Lower no-load losses, lower operating noise, more compact footprint, and less oil volume for the same rating.
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Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Read-only: no price factor, not part of the sum — the loss-grade cost is already carried by the efficiency (subtype) base price, so charging here would double-bill. Values come from the product library type-test data, interpolated between published capacities; grades the library does not cover show an em dash, never zero.
S13 系列（产品库 S13-M / 卷铁芯 S13-M.RL，Class 3）
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