SFZ11 35kV Oil Immersed Power Transformer
Type:Oil-immersed Transformer
Winding Type:Multi-winding Transformer
Primary Voltage:35kV-38.5kV
Rated Capacity: 50kVA-75000kVA
Phase:Three Phase
Vector Group:Yyn0/Yd11/Ynd11
Certifications: ISO 9001, SGS
Key Advantages: Ultra-low loss design, robust oil-immersed cooling, and adaptability to extreme environments.
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Product Basic Introduction
The 35kV Oil Immersed Power Transformer (SFZ11 series) is a high-voltage solution engineered for industrial and utility-scale power distribution. Designed as a three phase oil immersed transformer, it combines oil filled transformer efficiency with enhanced reliability, ensuring stable voltage transformation between 35kV and lower voltages. Its ultra-low losses (down to 0.25% no-load loss) reduce energy waste, while the oil-immersed cooling system guarantees heat dissipation even under continuous full load. Certified by ISO and SGS, this transformer is ideal for heavy-duty applications, such as power grids, mining operations, and large industrial facilities. Customizable from 50kVA-75000kVA, it balances high capacity and compact design, making it a cost-effective choice for long-term, high-demand environments.
Product specifications of 35kV Oil Immersed Power Transformer
|
S11-50~75000/35 Oil-immersed Power Transformer |
||||||||
|
Rated Capacity |
Voltage Combination |
Vector Group |
No-Load Loss (kW) |
Load Loss (kW)(75℃) |
No-Load Current (%) |
Short Circuit Impedance (%) |
||
|
High Voltage(kV) |
Tapping Range |
Low Voltage (kV) |
||||||
|
50 |
35-38.5 |
±5% |
0.4 |
Dyn11 |
0.16 |
1.20 |
1.30 |
6.5 |
|
100 |
0.23 |
2.01 |
1.10 |
|||||
|
125 |
0.27 |
2.37 |
1.10 |
|||||
|
160 |
0.28 |
2.82 |
1.00 |
|||||
|
200 |
0.34 |
3.32 |
1.00 |
|||||
|
250 |
0.40 |
3.95 |
0.95 |
|||||
|
315 |
0.48 |
4.75 |
0.95 |
|||||
|
400 |
0.58 |
5.74 |
0.85 |
|||||
|
500 |
0.68 |
6.91 |
0.85 |
|||||
|
630 |
0.83 |
7.86 |
0.65 |
|||||
|
800 |
0.98 |
9.40 |
0.65 |
|||||
|
1000 |
1.15 |
11.50 |
0.65 |
|||||
|
1250 |
1.40 |
13.90 |
0.60 |
|||||
|
1600 |
1.69 |
16.60 |
0.60 |
|||||
|
2000 |
1.99 |
19.70 |
0.55 |
|||||
|
2500 |
2.36 |
23.20 |
0.55 |
|||||
|
630 |
35-38.5 |
±5% |
3.15 |
Yd11 |
0.83 |
7.86 |
0.65 |
6.5 |
|
800 |
0.98 |
9.40 |
0.65 |
|||||
|
1000 |
1.15 |
11.50 |
0.55 |
|||||
|
1250 |
1.40 |
13.90 |
0.45 |
|||||
|
1600 |
1.69 |
16.60 |
0.45 |
|||||
|
2000 |
2.17 |
18.30 |
0.45 |
|||||
|
2500 |
2.56 |
19.60 |
0.45 |
|||||
|
3150 |
3.04 |
23.00 |
0.45 |
7.0 |
||||
|
4000 |
3.61 |
27.30 |
0.45 |
|||||
|
5000 |
4.32 |
31.30 |
0.45 |
|||||
|
6300 |
5.24 |
35.00 |
0.45 |
8.0 |
||||
|
8000 |
YNd11 |
7.20 |
38.40 |
0.35 |
||||
|
10000 |
8.70 |
45.30 |
0.35 |
|||||
|
12500 |
10.00 |
53.80 |
0.30 |
|||||
|
16000 |
12.10 |
65.80 |
0.30 |
|||||
|
20000 |
14.40 |
79.50 |
0.30 |
|||||
|
25000 |
17.00 |
94.00 |
0.25 |
8.0 |
||||
|
31500 |
20.20 |
112.00 |
0.25 |
|||||
|
40000 |
25.90 |
150.00 |
0.25 |
|||||
|
50000 |
29.40 |
210.00 |
0.25 |
|||||
|
63000 |
31.20 |
250.00 |
0.20 |
|||||
|
75000 |
33.40 |
300.00 |
0.20 |
|||||
|
SZ22-3150～31500/35 Parameters of On-load tap Oil-Immersed transformer(NX1) |
||||||||
|
Rated Capacity(kVA) |
Voltage Combination |
Vector Group |
No-Load Loss (kW) |
Load Loss |
No-Load Current (%) |
Impedance (%) |
||
|
High Voltage (kV) |
Tapping Range |
Low Voltage (kV) |
||||||
|
3150 |
35~38.5 |
±3*2.5% |
3.15 |
Yd11 |
1.80 |
22.20 |
0.50 |
7.0 |
|
4000 |
2.10 |
26.20 |
0.50 |
|||||
|
5000 |
2.60 |
30.80 |
0.50 |
|||||
|
6300 |
3.10 |
33.00 |
0.50 |
7.5 |
||||
|
8000 |
YNd11 |
4.30 |
36.50 |
0.40 |
||||
|
10000 |
5.10 |
43.20 |
0.40 |
|||||
|
12500 |
6.00 |
51.10 |
0.35 |
8.0 |
||||
|
16000 |
7.20 |
63.30 |
0.35 |
|||||
|
20000 |
8.50 |
74.40 |
0.30 |
|||||
|
25000 |
10.10 |
88.00 |
0.30 |
10.0 |
||||
|
31500 |
12.00 |
104.40 |
0.30 |
|||||
|
SZ22-3150～31500/35 Parameters of On-load tap Oil-Immersed transformer(NX2) |
||||||||
|
Rated Capacity(kVA) |
Voltage Combination |
Vector Group |
No-Load Loss (kW) |
Load Loss |
No-Load Current (%) |
Impedance (%) |
||
|
High Voltage (kV) |
Tapping Range |
Low Voltage (kV) |
||||||
|
3150 |
35~38.5 |
±3*2.5% |
3.15 |
Yd11 |
2.10 |
22.20 |
0.50 |
7.0 |
|
4000 |
2.50 |
26.20 |
0.50 |
|||||
|
5000 |
3.00 |
30.80 |
0.50 |
|||||
|
6300 |
3.70 |
33.00 |
0.50 |
7.5 |
||||
|
8000 |
YNd11 |
5.10 |
36.50 |
0.40 |
||||
|
10000 |
6.00 |
43.20 |
0.40 |
|||||
|
12500 |
7.10 |
51.10 |
0.35 |
8.0 |
||||
|
16000 |
8.50 |
63.30 |
0.35 |
|||||
|
20000 |
10.10 |
74.40 |
0.30 |
|||||
|
25000 |
11.90 |
88.00 |
0.30 |
10.0 |
||||
|
31500 |
14.20 |
104.40 |
0.30 |
|||||
|
SZ18-3150～31500/35 Parameters of On-load tap Oil-Immersed transformer(NX3) |
||||||||
|
Rated Capacity(kVA) |
Voltage Combination |
Vector Group |
No-Load Loss (kW) |
Load Loss |
No-Load Current (%) |
Impedance (%) |
||
|
High Voltage (kV) |
Tapping Range |
Low Voltage (kV) |
||||||
|
3150 |
35~38.5 |
±3*2.5% |
3.15 |
Yd11 |
2.60 |
23.50 |
0.50 |
7.0 |
|
4000 |
3.10 |
27.60 |
0.50 |
|||||
|
5000 |
3.70 |
32.50 |
0.50 |
|||||
|
6300 |
4.50 |
34.90 |
0.50 |
7.5 |
||||
|
8000 |
YNd11 |
6.30 |
38.60 |
0.40 |
||||
|
10000 |
7.40 |
45.60 |
0.40 |
|||||
|
12500 |
8.70 |
54.00 |
0.35 |
8.0 |
||||
|
16000 |
10.50 |
66.80 |
0.35 |
|||||
|
20000 |
12.40 |
78.60 |
0.30 |
|||||
|
25000 |
14.60 |
92.90 |
0.30 |
10.0 |
||||
|
31500 |
17.40 |
110.20 |
0.30 |
|||||
Core Technical Advantages of 35kV Oil Immersed Power Transformer
① Energy Efficiency & Reduced Losses
The SFZ11 integrates oil filled transformer cores with ultra-thin, high-grade silicon steel, cutting no-load losses by up to 35% compared to conventional models. This directly lowers operational costs and aligns with global energy efficiency standards.
② Robust Cooling System
The 35kV Oil Immersed Power Transformer uses forced-oil circulation for precise temperature control, enabling stable performance in temperatures from -40°C to +50°C. The full-seal oil tank prevents contamination, extending service life without frequent maintenance.
③ High-Performance Three Phase Design
As a three phase oil immersed transformer, it ensures balanced power distribution across all phases, minimizing harmonics and voltage fluctuations. The design also enhances short-circuit resistance (up to 200% overload for 2 hours), ideal for unpredictable grid demands.
④ Customization & Compliance
Available in 50kVA-75000kVA ranges, the SFZ11 can be tailored to meet specific voltage ratios (e.g., 35kV/0.4kV for rural grids or 35kV/10kV for substations). Its compliance with IEC 60076 and ISO certifications ensures safety, insulation reliability, and seamless integration into global power systems.
Application Scenarios
The 35kV Oil Immersed Power Transformer excels in critical infrastructure settings, including:
Utility Grids: Primary use for substation upgrades and 35kV-to-low-voltage distribution.
Industrial Plants: Powers heavy machinery in factories, mines, and petrochemical facilities.
Renewable Energy: Converts wind/solar farm outputs to 35kV grids for efficient grid injection.
Rural Electrification: Delivers stable power to remote areas via compact three phase oil immersed transformer designs.
Commercial Buildings: Supports high-power HVAC, lighting, and elevator systems in large complexes.
Product Testing
Insulation Resistance Test: Confirms dielectric strength and safety at 35kV.
Short-Circuit Withstand Test: Verifies mechanical stability under 200% rated current.
Temperature Rise Test: Measures thermal performance under full load via oil filled transformer circulation.
Partial Discharge Test: Ensures no internal arcing at high voltages.
Environmental Simulation: Tests durability in extreme temperatures and humidity.
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Why choose us?
GNEE strictly follows the comprehensive acceptance testing process to ensure that the performance of each device meets the standards. Our products and services have been successfully applied in more than 50 countries and regions around the world. As a trusted global industrial partner, we are always committed to helping customers achieve their sustainable development vision through high-quality products and full-process services.
Support
• Pre-sales: Free technical consulting, drawing review, and installation training.
• After-sales:
o Global warranty for 2 years; 5-year warranty on core components.
o 7×24-hour remote support, fault response within <24 hours.
o Operation manual provided.
Product Testing Center
SGS certification certificate
Our factory
Packing and Delivery
The transformer unit is encased in a high-strength, corrosion-resistant wooden crate. Both inner and outer layers are covered with waterproof and moisture-proof membranes, effectively isolating the unit from rainwater, humidity, and dust.
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