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As a professional manufacturer deeply rooted in electrical equipment, we supply the premium 35KV Oil-Immersed Power Transformer (Full Copper S20 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 ultra-low loss, strong short-circuit resistance, exceptional high-temperature tolerance, and a long lifespan, it is the optimal choice for 35KV medium-to-large substations, regional grids, industrial main distribution systems, and renewable energy integrations.
Core Parameters:
• Energy Efficiency: Tier 1 Efficiency (GB 20052-2024), reducing losses by 15%~30% 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. Meets Tier 1 efficiency standards, reducing no-load and load losses by 15%~30% compared to traditional 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 S20 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 significantly over long-term operation. |
| 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 S20 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 S20 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 | 235 | 1700 | 0.8 | 250 | 1100 | 1300×1000×1400 | 550 |
| 200 | 6.5 | 270 | 2100 | 0.8 | 280 | 1250 | 1350×1050×1450 | 550 |
| 250 | 6.5 | 320 | 2450 | 0.7 | 320 | 1450 | 1450×1100×1500 | 550 |
| 315 | 6.5 | 385 | 2950 | 0.7 | 380 | 1650 | 1500×1150×1550 | 660 |
| 400 | 6.5 | 460 | 3600 | 0.6 | 450 | 1900 | 1550×1200×1600 | 660 |
| 500 | 6.5 | 545 | 4250 | 0.6 | 520 | 2200 | 1650×1250×1650 | 660 |
| 630 | 6.5 | 650 | 5100 | 0.6 | 600 | 2600 | 1700×1300×1750 | 820 |
| 800 | 6.5 | 780 | 6150 | 0.5 | 750 | 3200 | 1800×1400×1850 | 820 |
| 1000 | 6.5 | 920 | 7400 | 0.5 | 900 | 3800 | 1900×1450×1950 | 820 |
| 1250 | 6.5 | 1090 | 8800 | 0.5 | 1100 | 4500 | 2000×1550×2050 | 820 |
| 1600 | 6.5 | 1300 | 10800 | 0.5 | 1350 | 5400 | 2100×1650×2150 | 820 |
| 2000 | 6.5 | 1550 | 13000 | 0.4 | 1600 | 6500 | 2250×1800×2300 | 820 |
| 2500 | 6.5 | 1850 | 15500 | 0.4 | 1950 | 7800 | 2400×1900×2450 | 820 |
| 3150 | 6.5 | 2200 | 18800 | 0.4 | 2400 | 9500 | 2600×2050×2650 | 820 |
* The table above displays standard S20 technology platform parameters for the 35kV class. Dimensions, weights, and electrical properties scale with specific capacities and custom configurations.
FAQ
To ensure installation quality and operational stability for this 35KV full copper structure, please strictly observe the following core precautions:
1) Installation Layout Adaptation: Select an outdoor location with elevated terrain and smooth drainage, away from water sources and flammable items. Reserve a maintenance channel of ≥1.5m and ensure no obstructions around the equipment for optimal heat dissipation.
2) Foundation and Fixation: The foundation must be poured with concrete, and its bearing capacity must meet the requirements of the equipment (≥3.5t/㎡). After installation, the equipment must be leveled and firmly secured with anchor bolts to prevent vibration.
3) Power Matching & Grounding: Ensure the input/output voltages match the grid. Use suitably cross-sectioned copper busbars or high-voltage cables. The oil tank and core must adopt single-point grounding with a resistance of ≤4Ω, and additional lightning protection devices must be installed.
4) Tap Changer & Oil Check: Verify the tap position matches design requirements and check its locking reliability. Inspect the oil tank for leaks and test the insulating oil quality before use.
5) Cooling System Check: Clean the radiators. For forced cooling (OFAF/ODAF) models, ensure the wiring of cooling fans, water pumps, and control systems is correct.
6) Protection System Synergy: Ensure the transformer's vector group and impedance match the substation's relay protection systems (e.g., Buchholz, overcurrent protection) to prevent false tripping.
7) Trial Run Inspection: Conduct insulation, ratio, and DC resistance tests (focusing on the full copper windings). After passing, power on for a no-load operation of 2 hours, then proceed with a loaded trial run. Monitor for abnormal noise, oil leakage, or excessive temperature rise.
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
