220kV Oil-immersed Transformer
1.High voltage level, large transmission capacity, long distance, suitable for 220kV main network hub substations.
2.Oil-immersed insulation is mature and reliable, with good heat dissipation, long service life and stable operation.
3.Low loss, high energy efficiency, and long-term energy saving and consumption reduction.
4.Strong short-circuit resistance, high safety margin, and good grid adaptability.
220kV oil-immersed power transformers are core equipment in ultra-high voltage power transmission and distribution systems. They are mainly used in key scenarios such as power plant boosting, regional substations, large industrial parks, urban power grid hubs, and main power supplies for rail transit, undertaking core functions such as voltage transformation, power transmission, grid interconnection, 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 technical standards of State Grid and China Southern Power Grid. It features low loss, low noise, short-circuit resistance, long service life, and high reliability, and can operate continuously for a long time in complex environments such as outdoors, indoors, high altitudes, heavy pollution, extreme cold, and high temperatures.
The product adopts a fully sealed oil-immersed structure, with highly integrated iron core, windings, voltage regulating device, cooling system, and protection system. The overall structure is compact, with reliable insulation, strong overload capacity, and minimal maintenance. It is a benchmark main equipment in terms of safety, stability, and economy in 220kV voltage level power grids.
II. Executive Standards and Certifications
GB 1094.1～12 "Power Transformers"
GB/T 6451 "Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers"
GB/T 10237 "Insulation Levels and Insulation Tests for Power Transformers"
GB/T 16434 "High-Voltage Equipment for Outdoor Severe Conditions"
IEC 60076 International Electrotechnical Commission Standards
Q/GDW State Grid Enterprise Standards
Passed: Type tests, routine tests, sudden short-circuit tests, partial discharge tests, temperature rise tests, lightning impulse tests
III. Operating Environment Conditions (Customizable)
Altitude: ≤1000m (customizable ≤3000m high-altitude type)
Ambient temperature: -40℃ ～ +45℃
Maximum daily average temperature: +30℃
Maximum annual average temperature: +20℃
Outdoor pollution level: Class III, Class IV (customizable anti-pollution type, heavy pollution type)
Applicable places: Outdoor / indoor, substations, power plants, hub stations, large industrial and mining areas
IV. Structural Composition and Core Components (Extremely Detailed)
(1) Iron Core: Core of low loss and low noise
Materials
High magnetic permeability high-quality cold-rolled grain-oriented silicon steel sheets are used, with grades 30Q120 / 27ZH100 low-loss levels.
The surface insulation coating of iron core sheets is uniform, with stable insulation performance, no burrs, and no rust.
Structural technology
Full miter joint and step lamination structure reduce no-load loss and noise.
High-strength epoxy binding tape for overall binding, with strong rigidity, vibration resistance, and low operating noise.
Iron core grounding: Reliable single-point grounding to prevent heating due to multi-point grounding.
Performance characteristics
Low no-load loss, 10%～20% lower than the national standard on average
Small excitation current, stable operation
Strong anti-saturation and anti-impact capabilities
(2) Windings: High short-circuit resistance and high reliability
Conductor materials
High voltage: Paper-insulated flat copper wire / electromagnetic wire
Low voltage: Copper foil or composite electromagnetic wire, with uniform current density
Electrical copper with purity ≥99.99%, high conductivity, and low heat generation
Insulation structure
Oil gap insulation composed of high-density insulating cardboard, diamond-point adhesive paper, spacers, and pads.
Main insulation and longitudinal insulation are strictly designed according to 220kV impulse withstand voltage, with sufficient margin.
Uniform oil channels between winding layers and cakes, 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.
Strong end compression structure, with extremely strong resistance to sudden short circuits.
Core advantages
Short-circuit withstand capacity: Meets the highest standards of State Grid /
Company Profile
Xinda Transformer Co., Ltd. is located at No. 38, Jinsan Road, Fenghuang Industrial Park, Dongchangfu District, Liaocheng City, Shandong Province, China. The company has a registered capital of RMB 150 million and covers an area of approximately 186,667 square meters (280 mu). It is recognized as a National High-Tech Enterprise, a Shandong Province Technology Innovation Demonstration Enterprise, an Excellent Private Technology Enterprise of Shandong Province, a Shandong Model Base for Employment of the Disabled, a Shandong Province Contract-Honoring and Trustworthy Enterprise, a Liaocheng Municipal Enterprise Technology Center, an Excellent Industrial Enterprise of Dongchangfu District, a Science and Technology Innovation Demonstration Enterprise of Dongchangfu District, and a Key Backbone Enterprise of Dongchangfu District.
The annual production capacity is 9,000 MVA. The total construction area of office buildings, R&D facilities, and standardized workshops is 53,000 square meters. Equipped with over 470 sets of advanced production equipment, the company possesses a manufacturing capacity of 10,000 MVA for transformers up to 220 kV, along with complementary switchgear systems.
