1. Technical characteristics of oil immersed transformers
Excellent heat dissipation performance: Transformer oil has strong fluidity and can withstand large capacity and long-term continuous loads through oil circulation and heat dissipation fins;
Stable and reliable insulation: The combination of insulating oil and cardboard insulation system has high voltage resistance, impact resistance, and is suitable for high voltage and large capacity working conditions;
Cost efficient and adaptable to high power: The manufacturing cost is lower for the same capacity, and it can produce ultra large capacity main transformers that are compatible with the main power lines of the power grid;
Good overload buffering capacity: The oil has a large heat capacity, and the temperature rise during short-term overload is slow, with strong resistance to impact loads;
Mature operation and maintenance system: equipped with oil level gauge, thermometer, gas relay, pressure relief valve, complete fault monitoring and protection;
Suitable for outdoor installation: The whole machine has a sealed oil tank structure, which can be arranged outdoors without the need for a dedicated enclosed indoor computer room;
2. Product features
2.1 Design standards: GB, IEC
2.2 Capacity (MVA): 0.1 to 31.5
2.3 Voltage (KV): 0.1-35
2.4 Cooling method: ONAN (oil natural circulation air self cooling)/ONAF (oil natural circulation air cooling)
2.5 Installation location: Can be installed outdoors, in semi enclosed distribution areas, inside the box transformer housing, and in independent outdoor transformer station areas.
2.6 Application scenarios: Urban and rural power grid distribution areas, industrial parks, mining and metallurgy, photovoltaic/wind power boosting stations, municipal public substations, large commercial parks, water conservancy power stations, railway traction power supply, long-distance transmission backbone networks, and renovation of old residential power grids.
2.7 Insulation grade: winding main insulation grade A (oil paper insulation system)
2.8 Operating environment:
Environmental temperature: maximum+40 ℃, minimum -35 ℃;
Altitude: ≤ 1000m, customized reinforced insulation type for high-altitude areas;
Atmospheric conditions: no severe corrosive gases, no large amounts of flammable and explosive dust, outdoor tolerance to rain, wind and frost;
Special requirements: Indoor installation must be accompanied by fire isolation and oil storage tanks; Outdoor areas need to have a good foundation for anti-corrosion and water accumulation prevention.
2.9 Types
According to the voltage regulation method: Non excitation voltage regulation (NLTC) oil transformer, on load voltage regulation (OLTC) oil transformer;
By purpose: distribution transformer, step-up transformer, rectifier transformer, mining explosion-proof oil transformer;
According to energy-saving level: S11, S13, S15, S20 series energy-saving oil immersed transformers;
According to structure: corrugated oil tank type, sheet oil tank type, fully sealed oil immersed type;
According to voltage level: 10kV distribution oil transformer, 35kV main transformer.
