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Oil-Immersed Isolation Transformers Series Three Phase Transformers
11 Models available
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Oil-Immersed Isolation Transformers — Three Phase Rectifier Duty
Oil-immersed three-phase isolation and rectifier transformers provide galvanic isolation between the supply and load with oil-immersed cooling for higher ratings and outdoor duty. Rated 10–2500 kVA, 6/10/35 kV primary, for rectifier, isolation and power-conversion applications requiring robust oil-immersed construction.
Key Features
- Galvanic isolation between primary and secondary
- Oil-immersed ONAN cooling for higher ratings
- 10–2500 kVA, 6/10/35 kV primary
- Suitable for outdoor and rectifier duty
- Sealed tank with conservator or sealed design
- Custom impedance and vector groups
Applications
- Rectifier and power-conversion systems
- Industrial isolation and grounding
- Outdoor distribution isolation
- Renewable plant auxiliary supplies
TECHNICAL DRAWING
Model: ISO-200KVA | Type: Oil-immersed transformer | Capacity: 200 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 | 50–630 kVA |
| HV Voltage (kV) | 10 |
| LV Voltage (kV) | 0.4 |
| Frequency (Hz) | 50/60 |
| Impedance (%) | 4.5 |
| Cooling | ONAN |
| Efficiency | >97% |
| Standard | IEC 60076 / GB1094.1 |
| Connection | Dyn11 |
| Insulation class | A(105°C) |
| Allowed temperature rise | 65 |
| Noise level | 50 dB(A), 55 dB(A), 58 dB(A), 61 dB(A), 64 dB(A) |
| Tap Changer | ±5% |
| No-load loss | 130–810 W |
| Load loss | 870–6200 W |
| Compare | Model | Series | Capacity (kVA) | Input voltage | Output voltage | Frequency (Hz) | Rated current (A) | Weight | Dimensions |
|---|---|---|---|---|---|---|---|---|---|
| ISO-50KVA | Oil-Immersed Isolation Transformers | 50kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 275 kg | 1180×920×1575 mm | |
| ISO-80KVA | Oil-Immersed Isolation Transformers | 80kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 336 kg | 1280×995×1705 mm | |
| ISO-100KVA | Oil-Immersed Isolation Transformers | 100kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 375 kg | 1335×1040×1780 mm | |
| ISO-125KVA | Oil-Immersed Isolation Transformers | 125kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 422 kg | 1400×1090×1870 mm | |
| ISO-160KVA | Oil-Immersed Isolation Transformers | 160kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 486 kg | 1485×1155×1980 mm | |
| ISO-200KVA | Oil-Immersed Isolation Transformers | 200kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 556 kg | 1570×1220×2095 mm | |
| ISO-250KVA | Oil-Immersed Isolation Transformers | 250kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 641 kg | 1670×1300×2230 mm | |
| ISO-315KVA | Oil-Immersed Isolation Transformers | 315kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 748 kg | 1790×1390×2385 mm | |
| ISO-400KVA | Oil-Immersed Isolation Transformers | 400kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 882 kg | 1930×1500×2575 mm | |
| ISO-500KVA | Oil-Immersed Isolation Transformers | 500kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 1035 kg | 2085×1620×2780 mm | |
| ISO-630KVA | Oil-Immersed Isolation Transformers | 630kVA | 10kV (3-phase) | 0.4kV isolated secondary | 50/60 | — | 1228 kg | 2270×1765×3025 mm |
Selection Guide
Cooling
Confirm ONAN oil-immersed cooling for the rating and environment.
Isolation
Specify the required isolation level and vector group.
- Frequently Asked Questions
Why choose oil-immersed isolation?
Oil-immersed construction supports higher ratings and outdoor installation, with the transformer providing galvanic isolation to decouple the load from supply-side faults and noise.
What ratings are available?
10–2500 kVA at 6/10/35 kV, sized to the isolation or rectifier duty.
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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.
Reference prices are for estimation only and do not constitute a formal offer.
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