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High-Efficiency 220kVA Oil Transformers for Heavy-Duty Applications
Structural Features
Core
High-permeability cold-rolled silicon steel strips with layer insulation to minimize eddy current losses.
Three-phase five-limb design to reduce zero-sequence impedance and suppress harmonics.
Windings
High Voltage Winding: Copper foil wound with Nomex paper interlayer insulation.
Low Voltage Winding: Multi-layer cylindrical structure for enhanced short-circuit resistance.
Tank and Cooling
ONAN design with natural oil circulation and no external fans, ideal for outdoor installation.
Corrugated radiator fins integrated into the tank for efficient heat dissipation.
Insulation System
Mineral oil (or eco-friendly ester oil) provides insulation, cooling, and arc extinction.
Partial discharge level ≤50pC (IEC 60076 compliant).
Applications
Industrial Power Distribution
Medium-voltage distribution (10kV to 0.4kV) in factories, mines, and metallurgical plants.
Supports short-term overload (e.g., electric furnaces, motor startups).
Commercial Buildings
Power distribution for malls, office towers, and hotels.
Infrastructure
Railway stations, airports, and wastewater treatment plants.
Remote Areas
Operates reliably in high humidity, dusty, or temperature-fluctuating environments.
Key Advantages
High Reliability
Fully sealed tank prevents oil oxidation and contamination.
Strong short-circuit withstand capability (GB/T 1094.5 compliant).
Low Maintenance
Maintenance-free design with real-time oil level and temperature monitoring.
Cost-Effective
Low initial investment and minimal operational energy losses.
Eco-Friendly Options
Available with biodegradable ester oil (e.g., FR3) for RoHS compliance.
Selection Guidelines
Each unit undergoes rigorous testing, including:
Insulation resistance and impulse voltage tests.
Load loss and no-load loss measurements.
Short-circuit withstand verification.
Certified by ISO 9001, ISO 14001, and KEMA for global compliance.
Selection Guidelines
Load Characteristics
Confirm load type (steady vs. fluctuating).
Assess short-term overload requirements (e.g., electric arc furnaces).
Environmental Conditions
Altitude ≤1,000 meters (derating required above this).
Ambient temperature: -25℃ to +45℃ (enhanced cooling for tropical regions).
Compliance
Meets GB 1094 (China), IEC 60076 (international), and industry-specific certifications (e.g., ATEX for explosive atmospheres).
Installation and Maintenance
Installation Requirements
Level foundation with ≥1m clearance on all sides for heat dissipation.
Grounding resistance ≤4Ω; separate lightning protection design.
Routine Maintenance
Check oil level, color, and leaks every 6 months.
Test insulation resistance annually using a 2,500V megohmmeter.
Troubleshooting
Overheating: Inspect radiator blockage or abnormal loads.
Oil Chromatography Analysis: Detect early signs of internal discharge or insulation degradation.
Why choose us
JIEZOU POWER, a professional designer, manufacturer and installer of power system solution around the World, was founded in 1989 year, occupies 200,000 square meter.
JIEZOU POWER, mainly manages power grid projects, 500KV EPC, 230KV hydroelectric power plant, 115KV power substation, etc.
JIEZOU POWER factory can manufacture oil type and dry type distribution transformer, max 500KV 480MVA power transformer, GIS, switchgear, substation, based on ANSI/IEEE/DOE2016/CSA/IEC60076 standard.
JIEZOU POWER successively obtain ISO9001, ISO14001, ISO45001,UL, CUL, CSA certificate, SGS, TUV,INTERTEK, TYPE TEST REPORT. Until 2023 year, worldwide branch companies and factories are distributed in United States, Canada, Dubai, Dominican Republic, Philippines, Chinese branch factories and companies are in BengBu city, FengYang city, HaiAn city, TaiZhou city, SuZhou city, ShenYang city, FoShan city.
Looking into the future, JIEZOU POWER's vision is to be the most trusted power system solution provider, solve the World's most urgent power management challenges, accelerate the planet's transition to renewable energy. So that everyone can have a more low-carbon and bright life. To this end. we will do our utmost to make efforts.
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