220 kV oil-filled transformer
1. High voltage level, large transmission capacity, long distance, suitable for 220 kV main grid node substations.
2. Oil insulation is mature and reliable, with good heat dissipation, long service life, and stable operation.
3. Low losses, high energy efficiency, and long-term energy saving and consumption reduction.
4. Strong short-circuit resistance, high safety margin, and good grid adaptability.
I..Product Details
220 kV oil-immersed power transformers are core equipment in ultra-high voltage power transmission and distribution systems. They are primarily used in key scenarios such as power plant step-up, regional substations, large industrial parks, urban power grid nodes, and main power supply for railway transportation, performing essential functions including voltage transformation, power transmission, grid connection, and power distribution.
This product is designed, manufactured, and tested in strict accordance with GB 1094 Power Transformers, GB/T 6451, IEC 60076, as well as the technical standards of State Grid and China Southern Power Grid. It features low losses, low noise, short-circuit resistance, long service life, and high reliability, and can operate continuously in harsh conditions such as outdoors, indoors, high altitudes, heavy pollution, extreme cold, and high temperatures.
The product adopts a sealed oil-immersed structure with a highly integrated iron core, windings, voltage regulation device, cooling system, and protection system. The overall design is compact, with reliable insulation, high overload capacity, and minimal maintenance. It serves as a benchmark for safety, stability, and economy in 220 kV power grid primary equipment.
II. Operating Conditions (Customizable)
Altitude: ≤1000 m (customizable ≤high-altitude type 3000 m)
Ambient temperature: -40°C ~ +45°C
Maximum average daily temperature: +30°C
Maximum average annual temperature: +20°C
Outdoor pollution level: Class III, Class IV (customizable anti-pollution type, heavy pollution type)
Applicable locations: outdoor and indoor, substations, power plants, hub stations, large industrial and mining areas
III. Structural Composition and Main Components (Extremely Detailed)
(1) Iron core: low-loss and low-noise core materials
High-quality cold-rolled silicon steel sheets with high magnetic permeability are used, with low losses of 30Q120 / 27ZH100.
The surface thermal insulation coating of iron cores is uniform, with stable insulation performance, no burrs, and no rust.
Structural technologies
Full end-face yoke and step-laminated structure reduce no-load losses and noise.
High-strength epoxy tape for general fastening with high rigidity, vibration resistance, and low operating noise.
Iron core grounding: reliable single-point grounding to prevent heating due to multi-point grounding.
Performance characteristics
(2) Windings: high short-circuit resistance and high reliability
Conductor materials
High voltage: flat copper wire with paper insulation / electromagnetic wire
Low voltage: copper foil or composite electromagnetic wire with uniform current density
Insulation structure
Oil gap insulation composed of high-density insulating cardboard, diamond adhesive paper, spacers, and gaskets.
The main and longitudinal insulation are strictly designed considering the 220 kV impulse voltage with sufficient margin.
Uniform oil channels between winding layers and shielding, good heat dissipation and low partial discharge.
Manufacturing process
Constant pressure drying, vacuum oil immersion, overall curing and forming.
Windings are highly concentric, with precise dimensions and balanced ampere-turns.
Robust end compression structure, with extremely strong resistance to sudden short circuits.
Company profile
XindaTransformerCo., Ltd. is located at No. 38, Jingsan Street, Fenghuang Industrial Park, Dongchangfu District, Liaocheng City, Shandong Province, China. The company's registered capital is 150 million yuan and it covers an area of approximately 186,667 square meters (280 mu). It is recognized as a national high-tech enterprise, a demonstration enterprise for technological innovation in Shandong Province, an outstanding private technology enterprise in Shandong Province, a model base for the employment of disabled persons, a contract-abiding and trustworthy enterprise in Shandong Province, a municipal enterprise technology center in Liaocheng, an outstanding industrial enterprise in Dongchangfu District, a science and technology demonstration enterprise in Dongchangfu, and a key enterprise in Dongchangfu District. The annual production capacity is 9,000 MVA. The total construction area of office buildings, research and development facilities, and standardized workshops is 53,000 square meters. Equipped with more than 470 sets of modern production equipment, the company has a production capacity of 10,000 MVA for transformers with voltages up to 220 kV, as well as additionaldistribution equipment systems.
