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As a professional Oil immersed transformer manufacturer deeply rooted in electrical equipment, we supply the premium 35KV oil immersed power transformer (Full Copper S11 Series). Covering capacities from 160kVA to 3150kVA, it features an all-copper winding structure, high-quality mineral oil insulation, and a highly efficient cooling system. With core advantages such as low loss, strong short-circuit resistance, exceptional high-temperature tolerance, and a long lifespan, it is widely supplied to 35KV medium-to-large substations, regional grids, industrial main distribution systems, and renewable energy integrations.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (GB 20052-2024), reducing losses by 10%~20% compared to traditional 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, boosting conductivity by over 40% compared to aluminum. Meets Tier 2 efficiency to massively reduce OPEX.
Vacuum-filled mineral oil ensures exceptional overvoltage endurance. Equipped with PRVs 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 a design life of over 25 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 match diverse system architectures.
Optional integrated smart monitoring modules for remote tracking of winding temp, oil level, and load currents, enabling digital predictive maintenance.
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 S11 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 2 compliant. Reduces idle energy consumption by over 10% compared to traditional models. |
| Load Loss (120℃) | ≤ 1.8kW ~ ≤ 22.0kW | Full copper windings minimize resistance loss, reducing energy waste by 10%~20% 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
The 35kV oil immersed power transformer is a core power transmission and distribution device widely applied in urban power grids, industrial parks and regional power supply systems. It adopts advanced oil-immersed cooling and insulation technology, with excellent voltage conversion and power transmission performance, which can stably convert 35kV high-voltage electricity into low-voltage power suitable for daily production and domestic use. This equipment features compact structure, strong environmental adaptability and reliable operation, adapting to outdoor and indoor power supply scenarios in various complex climates.
As a key equipment for medium-voltage power distribution, the 35kV oil immersed power transformer boasts outstanding heat dissipation and insulation properties thanks to high-quality transformer oil and optimized winding design. It effectively reduces operational loss, lowers equipment failure rate and extends service life. With strict compliance with international and industrial safety standards, it supports long-term continuous operation, ensures stable and safe power supply for industrial production, commercial facilities and residential areas, and is an indispensable basic device for optimizing power grid operation and improving power supply quality.
Standard S11 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 S11 technology platform parameters for the 35kV class. Dimensions, weights, and electrical properties scale with specific capacities and custom configurations.
FAQ
The 35kv oil immersed power transformer is widely used in power plants, urban grid substations and industrial mining power supply systems to stabilize medium-voltage power transmission for long-distance energy delivery.
Our 35kv oil immersed power transformer features strong heat dissipation, stable insulation performance and low operation noise, which can continuously run under heavy load and adapt to various outdoor working environments.
Check the oil level, oil quality and sealing parts of the 35kv oil immersed power transformer monthly, test winding resistance quarterly and replace aging insulating oil to avoid equipment breakdown risks.
We support customizing capacity, impedance voltage and tap gear of 35kv oil immersed power transformer, and provide complete test reports and installation drawings matching clients’ grid project demands.
The top oil temperature of qualified 35kv oil immersed power transformer shall not exceed 85℃ under rated load; excessive temperature will accelerate insulation aging and shorten the whole service life greatly.
Whatsapp: +86-13961294414
E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
ADD: No. 1, Yulong Middle Road, Xuejia Town, Xinbei District, Changzhou City, China
Mobile: 0086-15380068868
