Oil Immersed Transformer

Your Professional Oil Immersed Transformer Supplier

Our goal is to become your true partner in the field of oil immersed transformer in China. Gnee Steel Group is committed to becoming the world's most internationally competitive supply chain group, meeting the different needs of different customers. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.

Why Choose Us

Our services:

In the pre-sales stage, our team of experts will recommend the most suitable products according to the needs of customers and provide detailed technical consultation. During the sales period, we ensure timely delivery and provide installation guidance. For after-sales, we provide long-term technical support, warranty services and spare parts to help customers maximize the use of products and get reliable maintenance during use.

Our certification:

Our company has obtained SGS certification. We have also passed ISO9001 and ISO14001 environmental management system certification.

Our capacity:

We have established long-term cooperative relationships with dozens of factories to ensure the production of our products, and our annual export volume exceeds 80,000 tons.

Quality control:

All our products are made of the highest quality materials and are subject to factory inspection, cargo inspection at any time.

Advantages of Oil Immersed Transformer

Efficiency: They minimise energy losses, leading to cost savings and reduced environmental impact.

Reliability: Their robust construction and use of insulating oil ensure high reliability and long service life.

Adaptability: These transformers can withstand voltage fluctuations and transient overloads, enhancing resilience.

Cost-effectiveness: Despite higher initial investment, their low maintenance requirements and extended service life result in substantial long-term savings.

Grid stability: They play a crucial role in enhancing grid stability, ensuring a consistent and reliable power supply to consumers.

Versatility: Oil-immersed transformers seamlessly integrate into diverse environments, from urban centres to rural areas, and operate efficiently across a wide range of voltages.

Oil Immersed Transformer Specification

Number of Phase	Three Phase
Winding Type	Two Winding
Rated Capacity	30kVA
High Voltage	10/11kV
Low Voltage	0.4kV
Tapping Range	±2x2.5%
Impedance Voltage	4%
Load Loss	0.63/0.6kW
No-load Loss	0.1kW
No-load Current	1.5%
Frequency	50/60Hz
Connection Group	Yyn0/Dyn11
Cooling Method	ONAN
Coil Material	Aluminum/Copper
Size	1050x660x1140mm
Weight	400kg

Construction of Oil-Immersed Transformers

Core:

Constructed from high-grade silicon steel laminations, minimising energy losses.

Windings:

Insulated meticulously to improve performance and longevity.

Insulating oil:

Circulates within the transformer to maintain optimal temperatures and protect internal components.

Cooling systems:

Utilise natural convection or forced circulation to dissipate heat efficiently, preventing overheating and ensuring consistent performance.

Hermetically sealed tanks:

Prevents contaminants from entering the transformer to ensure longevity and reliability and also accommodates oil expansion and contraction to reduce mechanical stress, thereby extending the transformer’s lifespan.

Types of Oil Immersed Transformer

01/

Single-phase transformers: Single-phase transformers use one pair of windings. It’s used in lower-load situations, such as rural areas.

02/

Three-phase transformers: 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.

03/

Power transformers: 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.

04/

Distribution transformers: Distribution transformers transmit lower voltages from the electrical grid to homes and businesses. They are much smaller than power transformers.

05/

Pole-mounted transformers: Pole-mounted transformers are connected to an electrical pole.

06/

Pad-mounted transformers: Pad-mounted transformers are mounted to a concrete pad on the ground.

S11-35KV Oil-Immersed Electrical Power Transformer

Applications of Oil Immersed Transformer

Oil-filled transformers are integral components in the electrical power distribution system, offering reliable and efficient performance. The oil inside the transformer serves dual purposes: it cools the transformer and acts as an insulating medium to prevent electrical faults. They are commonly found in power stations, substations, and industrial facilities, where their ability to manage significant electrical loads is crucial.

Oil-filled transformers are also essential in renewable energy systems, such as solar and wind power plants, ensuring that the generated power is safely and efficiently distributed.

Production Process of Oil Immersed Transformer

Core production: Core production is the first process in the production of transformers. We use fully automatic equipment to produce cores, with a high degree of automation of 95%, which not only improves efficiency but also ensures product consistency and accuracy.

Raw material testing: In the transformer manufacturing process, raw material testing is a key link to ensure product quality and performance.

Insulation production: The quality and performance of transformer insulation are crucial to the safe operation of the transformer. The insulation material is cut into the required shape and size according to the design.

Winding: We actively introduce cutting-edge automatic winding technology to make the winding process more accurate and efficient.

Suiting process: During the suiting process, we use a paper tube of a certain thickness to protect the iron core to avoid damage to the coil during the suiting process. The overlapping part of the paper tube is designed to be long enough to ensure the stability and strength of the entire structure.

Welding process: We use advanced automated welding equipment to weld high and low voltage leads. These equipment can accurately control the temperature and time during the welding process to ensure that the welding points are firm and reliable. After the welding is completed, we will conduct strict quality inspections.

Vacuum drying: This step ensures that the insulation material and coil are thoroughly dried to ensure the safety and durability of the transformer.

Vacuum oil filling: The vacuum oil filling technology we use ensures that there are no air bubbles inside the transformer, improving the durability and quality of the product.

Packing and Shipping of Oil Immersed Transformer

Packing	Standard export packing (inside:water proof paper,outside:steel covered with strips and pallets)
Shipping	Shipped by road, sea, rail

Other Service of Oil Immersed Transformer

Delivery time	7 to 15 working days
Payment terms	30%TT for deposit, 70% balance before shipment or LC at sight
Supply ablitity	10000 Ton/ per Month

FAQ

Q: What is the purpose of the oil immersed transformer?

A: Oil-filled transformers change a current to a higher or lower voltage using the principle of induction. This process creates a surplus of heat. The oil helps to keep the transformer from overheating. The windings and core are submerged in transformer oil.

Q: What is the difference between oil immersed and dry type transformers?

A: Dry-type transformers are considered safer and more environmentally friendly, while oil-filled transformers are more suitable for high-power applications. Both types of transformers are widely used in a variety of applications, including power distribution, lighting, industrial processes, and more.

Q: How does an oil transformer work?

A: Transformer oils are designed to operate effectively at very high temperatures, cooling, insulating, and stopping corona discharges and arcing. Transformer oils surround the core and windings of transformers, preventing wiring and cellulose-based insulation from oxidising, corroding and becoming less effective.

Q: What are the advantages of oil filled transformers?

A: Oil-filled transformers are generally more efficient and have a higher power density than dry-type transformers. They are commonly used in high-voltage power transmission and distribution systems, as well as in industrial and commercial applications, where a higher power rating and increased efficiency is required.

Q: Why dry type transformers are used?

A: Dry type transformers are widely used in various industries and applications because of their safety, reliability, and environmental benefits. They can operate in harsh conditions such as high humidity, fire risk, and seismic events without compromising their performance or posing any hazard to people or property.

Q: What are the parts of the oil-immersed transformer?

A: The iron core and winding constitute the important parts of the three-phase oil-immersed transformer. In addition, there are oil tanks, oil conservators, bushings, breathing apparatus, radiators, tap changers, gas relays, thermometers, oil purifiers, etc.

Q: What is the dual purpose of an oil-immersed transformer?

A: Immersing insulation material in oil not only improves the dielectric strength, but also prevents the erosion of moisture. The second function of transformer oil is heat dissipation. Transformer oil has a high specific heat and can be used as a coolant.

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional oil immersed transformer manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale oil immersed transformer at competitive price from our factory. Contact us for customized service. S13-20kV-Oil-Immersed Transformer