Your Professional Oil Immersed Transformer Supplier
A national high-tech enterprise focused on the power transmission and distribution sector, integrating R&D, production, sales, and service.Founded during a period of rapid development in China's power industry around the early to mid-2000s, the company capitalized on market demand generated by the construction and upgrading of power grids in Quzhou and surrounding areas. It established its foothold by relying on the local market.
Why Choose Us
Our Certificate
It holds over a hundred independent intellectual property rights and has achieved certifications including ISO9001 Quality Management System, ISO14001 Environmental Management System, ISO45001 Occupational Health and Safety Management System, ISO 50001 Energy Management System, and Social Responsibility Management System.
Advanced equipment
Our manufacturing facility is equipped with advanced machinery such as laser cutting machines, CNC punch presses and press brakes, welding and grinding robots, hydraulic shears, lathes, milling machines, and overhead cranes. We also operate complete surface treatment systems, including powder coating, curing ovens, and shot blasting equipment, ensuring efficient production and high-quality results.
Production Market
Our global footprint spans the Middle East, Southeast Asia, Europe, and Africa, supplying core electrical equipment for demanding industrial environments. With proven products and professional services, we reliably meet diverse technical needs and serve as a trusted partner worldwide.
Our Service
Our service supports you from pre-sales to after-sales. We provide one-on-one consultations to customize packaging solutions, strictly control production to ensure quality and on-time delivery with real-time updates, and offer comprehensive after-sales support for fast responses and a worry-free partnership.
Single-phase transformers use one pair of windings. It’s used in lower-load situations, such as rural areas.
Three-phase transformers are made up of three pairs of windings. The windings typically go around a core sectioned into three parts. Three-phase transformers are used in higher-load areas and can supply three circuits with energy.
Power transformers are designed to handle much higher loads. They can step voltages up or down and transmit a current from one place to another.
Distribution transformers transmit lower voltages from the electrical grid to homes and businesses. They are much smaller than power transformers.
Pole-mounted transformers are connected to an electrical pole.
Pad-mounted transformers are mounted to a concrete pad on the ground.
Key Components and Functions of an Oil-Immersed Transformer
|
Component |
Function |
|
Magnetic Core |
Directs magnetic flux to enable voltage transformation |
|
Windings (HV/LV) |
Carry electrical current; insulated and submerged in oil |
|
Insulating Oil |
Prevents electrical breakdown and removes heat |
|
Main Tank |
Holds the oil and active components in a sealed steel enclosure |
|
Radiators / Coolers |
Dissipate heat from the circulating oil to ambient air |
|
Conservator Tank |
Accommodates thermal oil expansion and contracts as temperatures change |
|
Breather (Silica Gel) |
Filters out moisture during air exchange in conservator system |
|
Buchholz Relay |
Detects internal faults by gas accumulation in the oil |
|
Pressure Relief Valve |
Releases internal overpressure in emergency conditions |
First, oil-filled transformers are more affordable. They are often up to half the price of a dry-type transformer with the same capacity.
Oil-immersed transformers tend to be more successful at cooling the transformer than a dry type. Oil is a better cooling medium. They also have a higher voltage capacity. Dry-type transformers operate below 35 kV, while there are no limits with oil-immersed. Oil transformers are more versatile.
Dry-type can typically go from an intermediate location to the power consumption source. Oil-immersed can function as both power and distribution transformers.
Oil-filled transformers are better for the environment, as they are much easier to recycle than dry-type. They are also smaller and work best in outdoor environments in case of an oil spill or other accident.
How Oil Immersed Transformer work
The working principle of oil-immersed transformer is based on electromagnetic induction and transformer principles.
When AC current from the input power supply passes through the main winding, the resulting magnetic field creates magnetic flux in the iron core. This flux passes through the adjacent secondary winding, causing another voltage to be induced in the secondary winding.
Specifically, when the current in the main winding changes, it creates an alternating magnetic field. This alternating magnetic field causes the ferromagnetic material in the core to undergo magnetization and demagnetization processes. This process creates a potential difference in the secondary winding, causing the current in the secondary winding to change accordingly.
According to the principle of a transformer, the transformation ratio between the primary and secondary windings is determined by the turns ratio of the windings. If the number of turns of the main winding is larger than that of the auxiliary winding, the output voltage will decrease; conversely, if the number of turns of the main winding is smaller than that of the auxiliary winding, the output voltage will increase.
In oil-immersed transformers, insulating oil plays an important role. First, the insulating oil cools the internal components of the transformer and keeps its operating temperature within a safe range. Secondly, insulating oil has good insulation properties and can prevent arcs and discharges.
In summary, the working principle of an oil-immersed transformer can be attributed to converting the voltage of the input power supply into the required output voltage through electromagnetic induction between the primary and secondary windings under the cooling and insulation protection of insulating oil.
The main structure of oil-immersed transformer is composed of body, oil tank, cooling device, protection device and outlet device. The body includes iron core, winding (coil), insulation, lead wire and tap changer; the fuel tank includes the fuel tank body and fuel tank accessories (oil drain valve, grounding screw, trolley, nameplate, etc.); the cooling device includes radiator and cooler; Protection devices include oil conservator, oil level, safety airway, moisture absorber, temperature measuring element and gas relay; outlet devices include high and low voltage bushings.
Packaging and Transportation
FAQ
We are one of the most experienced oil immersed transformer manufacturers and suppliers in China, specialized in providing high quality customized products. We warmly welcome you to buy oil immersed transformer for sale here from our factory. For quotation, contact us now.
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