Power Transformer 20/110KV, 40MVA, ONAN
High-reliability 110/20 kV, 40 MVA ONAN power transformer, IEC 60076 compliant. Copper windings, vacuum OLTC, full monitoring & accessories. Supplied from China to Europe and Worldwide delivery, 60-month warranty and proven references in Romania and other countries.
Applicated Reference
Wind power Station
PV Power Station
Generator Factory
Island
Large-scale
Industrial User
High Safety
- Advanced insulation systems for reliable, long-term performance
- Integrated protection relays to prevent overloads and short-circuits
- Fire-resistant and oil-containment options to minimize environmental risks
- Fully compliant with IEC/IEEE safety standards
Durability
- Rugged design with anti-corrosion coatings for outdoor applications
- Optimized cooling systems (ONAN/ONAF/KNAN) ensure stable operation under varying loads
- Designed for >25 years of service life with minimal maintenance
- Proven reliability under extreme weather and grid conditions
High Integration
- Compact footprint with customizable voltage ratios for BESS and renewable applications
- Plug-and-play connections simplify installation and commissioning
- Flexible design options: oil-immersed or dry-type transformers
- Scalable solutions from medium-voltage distribution up to utility-scale projects
TECHNICAL DATA SHEET 1d — Three-phase Transformer 110/20 kV, 40 MVA
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| Producer / Type / Code / Version | ||||
| — | Producer | — | ||
| — | Type / Code / Version | — | ||
| 1. Climatic and Environmental Conditions | ||||
| 1.1 | Installation location | — | Outdoor | — |
| 1.2 | Max. altitude | m | max. 1000 | — |
| 1.3 | Air temperature (max / min) | °C | +45 / -35 | — |
| 1.4 | Relative humidity at 20°C | % | 100 | — |
| 1.5 | Seismic acceleration | m/s² | 0.2 | — |
| 1.6 | Wind pressure | daN/m² | 70 | — |
| 1.7 | Max. solar radiation | kW/m² | 1.3 | — |
| 2. Construction Requirements | ||||
| 2.1 | Magnetic core material | — | Cold-rolled silicon steel laminations | — |
| 2.2 | Winding material | — | Copper | — |
| 2.3 | Insulating oil brand | — | Nynas | — |
| 2.3.1 | Dielectric loss tangent at 90°C (IEC 60247) | % | < 0.5 | — |
| 2.3.2 | Water content in oil (EN 60814) | ppm | < 10 | — |
| 2.3.3 | Breakdown voltage w/o treatment (EN 60156) | kV | > 70 | — |
| 2.4 | tgδ measurement sockets on bushings | — | Yes | — |
| 2.5 | Cooling method | — | ONAN | — |
| 2.6 | Protective coatings (interior/exterior, thickness, adhesion, fasteners) | — | Oil-resistant enamel (interior); primer + 2 paint coats (exterior); ≥80 μm; adhesion 1–2; galvanized hardware | — |
| 3. Technical Characteristics | ||||
| 3.1 | Voltage ratio at no-load | kV/kV | 110/20 | 110/20 |
| 3.2 | Rated power | MVA | 40/40 | 40/40 |
| 3.3 | On-load tap changer on 110 kV side — 19 steps (tap 1 / 10 / 19) | % / kV | ±9 × 1.78; 127.62 / 110 / 92.378 | Same |
| 3.4 | Vector group | — | Yod-11 | Yod-11 |
| 3.5 | Rated frequency | Hz | 50 | 50 |
| 3.6 | Efficiency index | % | Min. 99.724 | Min. 99.72 |
| 3.8 | No-load current | % | Max. 0.5 | Max. 0.5 |
| 3.9 | Short-circuit voltage (In, fn, 75°C windings) | % | 11.5 | 11.5 |
| 3.10 | Withstand voltages (50 Hz 1 min / LI 1.2/50 μs) — primary / secondary | kV | AC: 185 / 50 — LI: 450 / 125 | Same |
| 3.11 | Insulation class | — | A | A |
| 3.12 | Max. winding temperature rise | °C | 60 | 60 |
| 3.13 | Max. oil temperature rise | °C | 55 | 55 |
| 3.14 | Minimum creepage distance — 110 kV / 20 kV bushings | mm | ≥3000 / ≥600 | Same |
| 3.15 | Noise level | dB | Max. 60 | Max. 60 |
| 3.16 | Masses (total / max. lifting / at assembly / oil / max. transport) | t | — | ≈69 / ≈45 / ≈40 / ≈19 / ≈45 |
| 4. Accessories | ||||
| 4.1–4.6 | Magnetic oil level indicator; Air filter; OLTC; Pressure relief valve; Winding temperature indicator; Oil temperature indicator | — | As required | As required |
| 4.8 | Tap-changer drive | — | As required | As required |
| 5. Maintenance & Reliability | ||||
| 5.1 | Interval between inspections | — | EP Conference 116/94 | As required |
| 5.2 | Guaranteed lifetime | years | 30 | 30 |
| 6. Tests | ||||
| 6.1 | Type tests | — | per SR EN 60076 | As required |
| 6.2 | Routine tests | — | per SR EN 60076 | As required |
| 7. Documents Supplied | ||||
| 7.1–7.4 | Technical book; Lot sample test report; Type test report; Declaration of conformity incl. warranty & quality certificates | Yes/No | Yes | Yes |
| 8. Warranty | ||||
| 8.1 | From commissioning | months | 60 | 24+36 |
TECHNICAL DATA SHEET No.2 — Magnetic Oil Level Indicator
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| Producer: Top 3 in China (details provided by ProfiCircle after NDA). Type/Code/Version: — | ||||
| 1. Climatic & Environmental | ||||
| 1.1 | Installation location | — | Outdoor | Outdoor |
| 1.2 | Max. altitude | m | max. 1000 | max. 1000 |
| 1.3 | Air temperature (max / min) | °C | +40 / -35 | +45 / -35 |
| 1.4 | Relative humidity at 20°C | % | 100 | 100 |
| 1.5 | Seismic acceleration | m/s² | 0.2 | 0.2 |
| 1.6 | Wind pressure | daN/m² | 70 | 70 |
| 1.7 | Max. solar radiation | kW/m² | 1.3 | 1.3 |
| 2. Construction Requirements | ||||
| 2.1 | Switch contacts | Yes/No | Yes | Yes |
| 2.2 | Magnetic coupling | Yes/No | Yes | Yes |
| 2.3 | UV-resistant laminated sight glass | Yes/No | Yes | Yes |
| 2.4 | Min/Max level signalling contacts | Yes/No | Yes | Yes |
| 3. Maintenance & Reliability | ||||
| 3.1 | Inspection interval | — | EP Conference 116/94 | EP Conference 116/94 |
| 3.2 | Guaranteed lifetime | years | 30 | 30 |
| 4. Tests | ||||
| 4.1 | Type tests | — | per product standard | As required |
| 4.2 | Routine tests | — | per product standard | As required |
| 5. Documents | ||||
| 5.1–5.4 | Technical book; Lot test report; Type test report; Declaration of conformity incl. warranty & quality certificate | Yes/No | Yes | Yes |
| 6. Warranty | ||||
| 6.1 | From commissioning | months | 60 | 24+36 |
TECHNICAL DATA SHEET No.3 — Transformer Air Filter
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| Producer / Type / Code / Version | ||||
| 1. Climatic & Environmental | ||||
| 1.1 | Installation location | — | Outdoor | Outdoor |
| 1.2 | Max. altitude | m | max. 1000 | max. 1000 |
| 1.3 | Air temperature (max / min) | °C | +80 / -50 | +45 / -35 |
| 1.4–1.7 | Humidity / Seismic / Wind / Solar | — | 100% / 0.2 m/s² / 70 daN/m² / 1.3 kW/m² | Same |
| 2. Construction Requirements | ||||
| 2.1 | High-grade steel filter | Yes/No | Yes | Yes |
| 2.2 | Modular humidity & temperature sensor | Yes/No | Yes | Yes |
| 2.3 | Hygroscopic substance | — | Silica gel | Silica |
| 2.4–2.6 | Test button / LED indicators / Filter heating | Yes/No | Yes / Yes / Yes | Yes / Yes / Yes |
| 3. Technical Characteristics | ||||
| 3.1 | UV-resistant exterior parts | Yes/No | Yes | Yes |
| 3.2 | Degree of protection (EN 60529) | IP | 55 | 55 |
| 3.3 | Analog level signal | mA | 4…20 | 4…20 |
| 3.4–3.6 | Periodic inspections / Silica replacement / Environmental pollution | — | Minimal / No / No | Minimal / No / No |
| 4–7. Maintenance, Tests, Documents, Warranty | ||||
| 4.1–4.2 | Inspection interval / Lifetime | years | 1 / 30 | 1 / 30 |
| 5.1–5.2 | Type / Routine tests (SR EN 60076) | — | As required | As required |
| 6.1–6.4 | Docs: Technical book; Lot report; Type report; DoC + warranty & quality | Yes/No | Yes | Yes |
| 7.1 | Warranty from commissioning | months | 60 | 60 |
TECHNICAL DATA SHEET No.4 — On-Load Tap Changer (Vacuum)
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| Producer / Type: Vacuum tap changer | ||||
| 1. Construction | ||||
| 1.1 | Commutation medium | — | Vacuum | Vacuum |
| 1.2 | Oil temperature range | °C | -25…+105 | -25…+105 |
| 2. Technical Characteristics | ||||
| 2.1 | Number of operating positions | No. | 19 | 19 |
| 2.2 | Mounting location | — | Inside transformer tank | Inside tank |
| 2.3 | Number of phases | No. | 3 | 3 |
| 2.4 | Rated current | A | 250 | 400 |
| 2.5 | Rated test current | kA | 4 | 4 |
| 2.6 | Peak test current | kA | 10 | 10 |
| 2.7 | Max. short-circuit duration | s | 3 | 3 |
| 2.8 | Frequency | Hz | 50 | 50 |
| 2.9 | Highest system voltage | kV | Max. 123 | 72.5 |
| 2.10 | Lightning impulse withstand (1.2/50 μs) | kV | 650 | 325 |
| 2.11 | Power-frequency withstand 50 Hz / 1 min | kV | 275 | 140 |
| 3–6. Maintenance, Tests, Documents, Warranty | ||||
| 3.1–3.4 | Guaranteed operations / Lifetime / Maintenance interval / During life | — | 600,000 / 30 years / 300,000 ops / — | 600,000 / 30 years / 200,000 ops / ✔ |
| 4.1–4.2 | Type & Routine tests (SR EN 60076) | — | As required | As required |
| 5.1–5.4 | Docs: Technical book; Lot report; Type report; DoC + warranty & quality | Yes/No | Yes | Yes |
| 6.1 | Warranty from commissioning | months | 60 | 60 |
TECHNICAL DATA SHEET No.5 — Pressure Relief Valve
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| 1. Climatic & Environmental | ||||
| 1.1 | Installation | — | Outside, on the transformer | Outside, on the transformer |
| 1.2 | Max. altitude | m | max. 1000 | max. 1000 |
| 1.3 | Air temperature (max/min) | °C | +80 / -40 | +45 / -35 |
| 1.4 | Oil temperature (max/min) | °C | +120 / -30 | +120 / -30 |
| 1.5–1.8 | Humidity / Seismic / Wind / Solar | — | 100% / 0.2 / 70 / 1.3 | Same |
| 2. Construction | ||||
| 2.1 | Materials (painted Al RAL7033 / stainless steel) | Yes/No | Yes / Yes | Yes / Yes |
| 2.2 | Micro-contacts | pcs | 1 NO + 1 NC | 1 NO + 1 NC |
| 3. Technical Characteristics | ||||
| 3.1 | Continuous operating current | A | 10 | 10 (AC) |
| 3.2 | Rated insulation voltage | kV·a.a. | 2.5 | 2.5 |
| 3.3 | Oil temperature range | °C | -30…+120 | -30…+120 |
| 3.4 | Working pressure | bar | 0.55 | 0.55 |
| 4–7. Maintenance, Tests, Documents, Warranty | ||||
| 4.1–4.2 | Inspection interval / Lifetime | — | EP Conf. 116/94 / 30 years | As required / 30 years |
| 5.1–5.2 | Type / Routine tests (SR EN 60076) | — | As required | As required |
| 6.1–6.4 | Docs: Technical book; Lot report; Type report; DoC + warranty & quality | Yes/No | Yes | Yes |
| 7.1 | Warranty from commissioning | months | 60 | 60 |
TECHNICAL DATA SHEET No.6 — Oil / Winding Temperature Measurement Set
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| 1. Climatic & Environmental | ||||
| 1.1–1.7 | Outdoor; max. altitude 1000 m; +45/-35°C; RH 100%; seismic 0.2; wind 70 daN/m²; solar 1.3 kW/m² | — | As listed | Same |
| 2. Components | ||||
| 2.1–2.7 | PT100 probe; analog indicator on transformer; resistive converter; ≥4 contacts; UV-filtered laminated glass; remote indication | Yes/No | Yes | Yes |
| 3. Technical Characteristics | ||||
| 3.1 | Measuring range | °C | -20…+140 | -20…+140 |
| 3.2–3.6 | Analog output 4–20 mA; remote indication; ambient compensation; current input (winding thermometer); powered 4–20 mA outputs | Yes/No | Yes | Yes |
| 3.7 | Recalibration required | Yes/No | Yes | — |
| 3.8 | Low maintenance | Yes/No | Yes | Yes |
| 4–7. Maintenance, Tests, Documents, Warranty | ||||
| 4.1–4.2 | Inspection interval / Lifetime | — | EP Conf. 116/94 / 30 years | As required / — |
| 5.1–5.2 | Type / Routine tests (SR EN 60076) | — | As required | As required |
| 6.1–6.4 | Docs: Technical book; Lot & type test reports; Declaration of conformity | Yes/No | Yes | Yes |
| 7.1 | Warranty from commissioning | months | 60 | 60 |
TECHNICAL DATA SHEET No.7 — Tap-Changer Drive Unit
| No. | Technical Features | MU | Value Required | Value Offered |
|---|---|---|---|---|
| 1. Climatic & Environmental | ||||
| 1.1–1.7 | Indoor or outdoor; altitude ≤1000 m; +45/-35°C; RH 100%; seismic 0.2; wind 70 daN/m²; solar 1.3 kW/m² | — | As listed | Outdoor / Same |
| 2. Construction | ||||
| 2.1 | Aluminium enclosure & door | Yes/No | Yes | Yes |
| 2.2 | Protection degree | IP | 65 | 65 |
| 2.3 | Anti-condensation design | Yes/No | Yes | Yes |
| 3. Technical Specifications | ||||
| 3.1 | Transmission ratio | — | 6.5 | 6.5 |
| 3.2 | Supply voltage | VAC | 230/400 | 230/400 |
| 3.3 | Frequency | Hz | 50 | 50 |
| 3.4 | Tap position indication | — | BCD + 1–19 (NO contacts) | BCD + 1–19 (NO contacts) |
| 3.5 | 19-position contact indication | Yes/No | Yes | Yes |
| 3.6 | Transmission mechanism | — | Wear-resistant V-belts | Wear-resistant V-belts |
| 3.7 | Protection against successive switching | — | Electro-mechanical interlock via active elements in control circuit; no auxiliary-circuit solutions accepted | Compliant |
| 4–7. Maintenance, Tests, Documents, Warranty | ||||
| 4.1–4.4 | Inspection / Guaranteed operations / Lifetime / MTBF | — | EP Conf. 116/94 / 600,000 / 30 years / — | Same / 600,000 / 30 years / 3 year⁻¹ |
| 5.1–5.2 | Type & Routine tests (SR EN 60076) | — | As required | As required |
| 6.1–6.4 | Docs: Technical book; Lot report; Type report; DoC + warranty & quality | Yes/No | Yes | Yes |
| 7.1 | Warranty from commissioning | months | 60 | 60 |
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