220kV Oil-Immersed Transformer
The 220kV oil-immersed transformer is a power device widely used in high-temperature and high-load environments, capable of withstanding heavy loads and effectively handling impact loads and sustained overloads. It is especially suitable for sectors requiring efficient, stable power supply — such as steel, metallurgy, railways, power plants and hydropower stations — safeguarding stable system operation and secure power transmission.
Product Introduction
Key Specifications
Rated Capacity
50kVA to 1000MVA
Rated Voltage
HV side 220kV, LV side 0.4kV
Rated Frequency
50Hz or 60Hz
Vector group
Commonly Dyn11, Yyn0, Yd11
Insulation Class
Usually Class A or Class F
Applications
Main grid hub
Regional power transmission hub stations, focusing on partial discharge control and reliability
Energy base
Large power plant transmission-out projects, emphasizing low losses and life-oriented design
Cross-regional power transmission
Long-distance transmission corridors, with focus on long-term stable operation
Product Overview
- Fully enclosed clean manufacturing: production in a constant-temperature, constant-humidity, dust-free environment with stricter process control
- Seven-level temperature control optimization: seven-level temperature control system combined with temperature field simulation for better-matched insulation configuration
- Zoned noise reduction: targeted noise control at the source delivers operating noise below national standards
- Multiple sealing verification: one-piece molded seals plus fluorescent and positive/negative pressure leak tests for lower leakage risk
- Premium core technology: imported cross-cutting and automatic stacking lines reduce no-load losses by about 20% compared with conventional processes
- Short-circuit capability verification: passed sudden short-circuit testing by a national testing agency on the first attempt for greater reliability
Product Features
Low-loss performance
No-load loss is over 10% lower than current national standard values and load loss over 5% lower, with overall performance reaching and complying with energy efficiency standards.
Low-noise design
Noise level is kept below 60dB in self-cooled operation; customized ultra-low-noise transformer solutions are available for users with special requirements.
High heat dissipation
Premium insulating oil and advanced heat-dissipation design effectively lower transformer operating temperature and extend service life.
High Reliability
Strong short-circuit resistance and environmental durability ensure stable operation in complex power grids.
Sealed and leak-proof
Optimized tank and sealing structure reduces leakage risk, suitable for long-term outdoor operation
Online monitoring
Supports condition monitoring of oil temperature, winding temperature, gas, and partial discharge for early warning and fewer outage repairs
Standards and certifications
GB 1094
Power transformer
GB/T 6451
Technical Parameters and Requirements for Oil-Immersed Power Transformers
GB/T 10228
Technical parameters and requirements for power transformers
IEC 60354
Transformer Loading Guide
ISO 14001
Environmental Management System Specification
Technical Advantages
R&D cloud platform
Integrates electromagnetic optimization design, parametric drawing, performance analysis, structural optimization, and automatic drawing output for transformers, enabling shared transformer design resources and search, modification, and version control of all kinds of data.
Simulation Analysis
Flow field, temperature field, electric field, leakage magnetic field, wave process, and short-circuit force. The R&D and design of every product series are verified through flow field and temperature field simulation analysis to determine the winding average temperature rise and hot-spot temperature, ensuring product performance.
Smart O&M platform
By collecting key data such as transformer temperature, current, voltage, vibration, and grid harmonics, it enables online power quality analysis and fault alarms, and can be installed on mobile phones.
