Product Overview
The 220kV oil immersed power transformer is a power transformer that uses mineral insulating oil as the cooling and insulating medium. It has a rated frequency of 50Hz and a rated voltage of 220kV. It is suitable for power systems to transform 220kV grid side voltage to different voltage levels such as 121kV and 38.5kV to achieve efficient power transmission and distribution. This product is one of the key pieces of equipment in 220kV transmission and transformation projects, and is widely used in State Grid hub substations, large power plant step up substations, regional power grid interconnections, and high energy consuming industrial enterprises. It is a core electrical equipment for the safe operation of regional power grids and cross regional power dispatch.
Technical Specifications
|
Parameter |
Project |
Typical values / range |
|
Basic parameters |
Rated voltage (high voltage side) |
220kV |
|
Rated voltage (low voltage side) |
110kV,35kV,10.5kV,10kV |
|
|
Rated frequency |
50Hz / 60Hz |
|
|
Number of phases |
Three phase |
|
|
Rated capacity (kVA) |
63000,90000,120000,150000,180000,240000,300000 |
|
|
Cooling method |
ONAN,ONAF,OFAF,ODAF |
|
|
Connection and tap |
Link Group |
YNd11,YNynd11 |
|
Tap method |
Off load voltage regulation / On load voltage regulation |
|
|
Tap range |
±2×2.5%,±4×2.5%,±8×1.25% |
|
|
Impedance and loss |
short circuit impedance |
12%～22% |
|
Applicable Standards |
GB 1094,IEC 60076,ANSI,IEEE,JIS |
|
|
Environment and Protection |
insulating oil |
25# and 45# transformer oil |
|
Operating ambient temperature |
-40℃～+45℃ |
|
|
altitude |
≤1000m (High altitude version available upon request) |
|
|
Temperature rise limit |
Oil top temperature rise ≤55K, average winding temperature rise ≤65K |
Product Features
|
Characteristic |
Product Technology Advantages |
|
Low loss and high energy efficiency |
By employing high permeability silicon steel sheets and optimized magnetic circuit design, the no load loss and load loss are significantly better than the national standard, achieving the first level energy efficiency level. |
|
Strong short circuit resistance |
The windings are tightly secured and reliably supported, capable of withstanding sudden short circuit impacts in the system. They possess high mechanical strength and pose no risk of deformation or displacement. |
|
Excellent insulation properties |
Employing high insulation strength transformer oil and a multi stage insulation structure, it features low partial discharge, long insulation life, and safe and stable operation. |
|
Strong heat dissipation performance |
Equipped with a high efficiency heatsink, supporting multiple cooling methods such as ONAN/ONAF/OFAF, it can meet the requirements of long term full load operation and short term overload operation. |
|
Fully sealed and maintenance free |
The use of corrugated oil tanks or capsule type oil conservators isolates the oil from air and moisture, slows down oil aging, and extends maintenance intervals. |
|
Comprehensive protection configuration |
Standard configuration includes gas relays, pressure relief valves, thermometers, oil level gauges, and other protective devices to comprehensively ensure safe equipment operation. |
Product Information and Certificates
We provide the following complete technical documentation and quality documents:
• Material Safety Data Sheet (MSDS)
• Factory Test Report
• Certificate of Conformity
• Product Certificate
• Product Installation and Operation Manual
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