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The 35kv oil immersed power transformer is a high-performance electrical device designed for reliable power distribution in industrial, commercial, and utility applications. It uses high-quality insulating oil for efficient cooling and enhanced safety, ensuring stable operation under various load conditions. With excellent energy efficiency, strong insulation performance, and long service life, the 35kv oil immersed power transformer is an ideal solution for medium-voltage power systems, substations, and grid infrastructure projects. Its durable design helps reduce maintenance costs and improve power supply reliability.
Core Parameters:
• Energy Efficiency: Tier 1 Efficiency (GB 20052-2024), reducing losses by 15%~30% compared to traditional S11 models.
• Structure: Full Copper Windings + High-Quality Mineral Oil + Fully Sealed Tank.
• Warranty: 5-Year Comprehensive Warranty covering all core components.
Manufacturer Core Advantages
High-voltage windings use oxygen-free copper wire and low-voltage uses full copper foil. Meets Tier 1 efficiency standards, reducing no-load and load losses by 15%~30% compared to traditional S11 models.
Vacuum-filled mineral oil ensures exceptional overvoltage endurance. Equipped with pressure relief valves and Buchholz relays to provide rapid fault isolation and eliminate safety risks.
The IP54 fully sealed tank confidently resists outdoor rain, dust, and extreme temperatures from -25℃ to 45℃, perfectly adapting to complex environments nationwide.
The sealed structure prevents oil aging, achieving an exceptional design life of over 30 years. Requires minimal routine maintenance, ideal for semi-unattended distribution sites.
Comprehensive coverage from 160kVA to 3150kVA. Supports custom low voltages (0.4kV/10kV) and specialized cooling to perfectly match diverse 35KV system architectures.
Optional integrated smart monitoring modules for remote tracking of winding temp, oil level, and load currents, enabling digital predictive maintenance and reducing inspection costs.
Provides a 5-year warranty on core components. Enjoy full-lifecycle support including precise pre-sales sizing, 24-hour rapid response, and on-site installation guidance.
Key Specifications (35kV Full Copper S13 Series)
| Parameter | Typical Value | Description |
| Rated Capacity | 160kVA ~ 3150kVA | Satisfies the load demands of 35KV medium-to-large substations and centralized industrial distribution. |
| Rated Voltage | HV: 35kV | LV: 0.4kV / 10kV | Standard 35KV input, customizable LV output to match diverse regional grid standards. |
| Vector Group | Dyn11 / Yyn0 | Mainstream connections ensuring simple wiring and exceptional voltage stability. |
| Impedance | 6% ~ 8% (35kV Class) | Effectively limits short-circuit currents, optimizing protection for downstream equipment. |
| No-Load Loss | ≤ 0.25kW ~ ≤ 3.5kW | Tier 1 compliant. Reduces idle energy consumption by over 15% compared to S11 models. |
| Load Loss (120℃) | ≤ 1.8kW ~ ≤ 22.0kW | Full copper windings minimize resistance loss, reducing energy waste by 15%~30% under load. |
| Winding Temp. Rise | ≤ 65K (Class A) | Mineral oil and plate radiators synergistically limit heat generation, preventing insulation aging. |
| Noise Level | ≤ 52~60dB(A) | Low-noise core and shock-absorbing mounts maintain a quiet footprint suitable for boundaries. |
| Cooling Method | ONAN (Standard) / OFAF / ODAF (Optional) | Natural cooling covers daily needs; forced cooling safely handles high temps and overloads. |
| Protection Level | IP54 (Outdoor Type) | Fully sealed tank blocks dust and moisture, safeguarding stable operation in complex environments. |
Detailed Description
Our core supply, the 35KV oil-immersed power transformer full copper S13 Series, encompasses a complete product line from 160kVA to 3150kVA. These are ultra-low loss, Tier 1 high-efficiency distribution transformers representing the premier choice for 35KV domestic grid power supply and primary distribution in medium-to-large industrial enterprises. Relying on mature manufacturing craftsmanship, we guarantee extremely low loss, stable operation, high short-circuit resistance, excellent environmental endurance, and a prolonged lifespan.
The high-voltage windings are precisely wound with oxygen-free copper wire, and the low-voltage windings use full copper foil. Compared to traditional aluminum windings, conductive loss is reduced by over 30% with superior thermal stability. The insulation system combines high-quality mineral oil with multi-layer insulating paper, processed under strict vacuum drying and oil-filling to thoroughly eliminate internal moisture and bubbles. Furthermore, the core is assembled using imported premium cold-rolled grain-oriented silicon steel with a 45-degree full-mitre step-lap joint, ensuring low noise, low loss, and immense mechanical strength. The fully sealed tank effectively prevents oil leakage and air ingress, resulting in partial discharge ≤10pC and an impressive design life of over 30 years.
Standard S13 Series Technical Reference (35kV Class)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | No-Load Current (%) | Oil Weight (kg) | Total Weight (kg) | Dimensions W×D×H (mm) | Gauge (mm) |
| 160 | 6.5 | 250 | 1800 | 0.8 | 250 | 1100 | 1300×1000×1400 | 550 |
| 200 | 6.5 | 290 | 2200 | 0.8 | 280 | 1250 | 1350×1050×1450 | 550 |
| 250 | 6.5 | 340 | 2600 | 0.7 | 320 | 1450 | 1450×1100×1500 | 550 |
| 315 | 6.5 | 410 | 3100 | 0.7 | 380 | 1650 | 1500×1150×1550 | 660 |
| 400 | 6.5 | 490 | 3800 | 0.6 | 450 | 1900 | 1550×1200×1600 | 660 |
| 500 | 6.5 | 580 | 4500 | 0.6 | 520 | 2200 | 1650×1250×1650 | 660 |
| 630 | 6.5 | 690 | 5400 | 0.6 | 600 | 2600 | 1700×1300×1750 | 820 |
| 800 | 6.5 | 830 | 6500 | 0.5 | 750 | 3200 | 1800×1400×1850 | 820 |
| 1000 | 6.5 | 980 | 7800 | 0.5 | 900 | 3800 | 1900×1450×1950 | 820 |
| 1250 | 6.5 | 1160 | 9300 | 0.5 | 1100 | 4500 | 2000×1550×2050 | 820 |
| 1600 | 6.5 | 1390 | 11400 | 0.5 | 1350 | 5400 | 2100×1650×2150 | 820 |
| 2000 | 6.5 | 1650 | 13700 | 0.4 | 1600 | 6500 | 2250×1800×2300 | 820 |
| 2500 | 6.5 | 1960 | 16400 | 0.4 | 1950 | 7800 | 2400×1900×2450 | 820 |
| 3150 | 6.5 | 2350 | 19800 | 0.4 | 2400 | 9500 | 2600×2050×2650 | 820 |
* The table above displays standard S13 technology platform parameters for the 35kV class. Dimensions, weights, and electrical properties scale with specific capacities and custom configurations.
FAQ
A 35kV oil immersed power transformer typically operates at 36.75kV or 40.5kV, designed for reliable medium-voltage power distribution.
A 35kV oil immersed power transformer uses ONAN/ONAF cooling, where oil circulates naturally or with fans for effective heat dissipation.
A 35kV oil immersed power transformer uses mineral insulating oil that meets IEC 60296 standards, ensuring safe and long-term insulation performance.
A 35kV oil immersed power transformer can last 25–30 years with proper maintenance, thanks to its robust oil-immersed insulation design.
Yes, a 35kV oil immersed power transformer is widely used in outdoor substations with weatherproof enclosures and corrosion-resistant tank finishes.
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E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
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