The differences between dry-type transformer and oil-immersed transformer

The differences between dry-type transformers and oil-immersed transformers, as follows: 1. Structure and Encapsulation: The iron core and windings of dry-type transformers are encapsulated with solid insulating materials such as resin casting. They have an open or semi-closed structure, allowing the internal components to be directly visible. The iron core and windings of oil-immersed transformers are immersed in transformer oil and encapsulated in a sealed oil tank. There are usually radiators on the outside. 2. Cooling Medium: Dry-type transformers use air or gases such as SF6 as the cooling medium. Oil-immersed transformers use transformer oil as the cooling and insulating medium. 3. Heat Dissipation Method: Dry-type transformers rely on natural air convection or forced air cooling by built-in fans for heat dissipation. Some high-end products use heat pipes and other means to enhance heat dissipation. Oil-immersed transformers transfer heat to the oil tank wall and heat dissipation devices through the circulation and convection of transformer oil for heat dissipation. 4. Capacity and Voltage Level: Dry-type transformers are usually used for small to medium capacities, and the voltage level generally does not exceed 35kV. Oil-immersed transformers are suitable for large capacities and high voltage levels. They have a wide capacity range, and the voltage level can reach 110kV and above. 5. Installation Environment and Safety: Dry-type transformers do not contain oil and have good fireproof performance. They are suitable for installation inside buildings and other places with high fire safety requirements. However, the operating environment has relatively strict requirements for temperature and humidity. In case of a fault in an oil-immersed transformer, it may lead to the combustion of the oil. They are usually installed in a dedicated indoor transformer room or an independent explosion-proof oil transformer house outdoors and require the installation of fire-fighting facilities. However, they have strong environmental adaptability. 6. Economy and Maintenance: The manufacturing process of dry-type transformers is complex, and the cost is high. But the maintenance is simple. There is no need to change the oil regularly. It is only necessary to pay attention to dust prevention, moisture prevention, and the operation of the fans. The initial investment of oil-immersed transformers is low. During maintenance, it is necessary to pay attention to the state of the insulating oil, and regularly take samples for testing, filtering, or replacement. However, they have a relatively strong overload capacity.

Nanyang Xinte Electrical Co., Ltd. Wins a Project Worth Over 15 Million Yuan from China State Grid

Recently, good news came from the State Grid Corporation of China. Nanyang Xinte Electrical Co., Ltd. stood out in the 8th batch of procurement in 2025 (the first substation equipment (including cables) bidding procurement for power transmission and transformation projects) and successfully won the bid, with the bid amount reaching over 15 million yuan. The products for this bid-winning are 10 kV and 35 kV oil-immersed power transformers, which will be applied to relevant power transmission and transformation projects of the State Grid. As an important enterprise in the power transmission and transformation equipment industry, Xinte Electrical has been focusing on the research, development, and production of energy-saving transformers and other products. Its products have gained wide recognition in the market due to their advantages such as low-carbon energy-saving, reliability, and stability. This successful bid for the State Grid project not only affirms the product quality and technical strength of Nanyang Xinte Electrical Co., Ltd. but also further demonstrates the company's competitiveness in the industry. As a leading enterprise in China's power industry, the bidding and procurement activities of the State Grid Corporation of China have always attracted much attention. The purpose of this power transmission and transformation project bidding is to enhance the power transmission capacity and power supply reliability of the power grid to meet the growing power demand. The winning bid of Nanyang Xinte Electrical Co., Ltd. will provide high-quality power transformer equipment for the project and help the smooth progress of the State Grid's power transmission and transformation projects. It is reported that Nanyang Xinte Electrical Co., Ltd. will carefully organize production in strict accordance with the order requirements to ensure the on-time delivery of products and provide high-quality after-sales services. In the future, Nanyang Xinte Electrical Co., Ltd. said it will continue to increase R & D investment, continuously improve product quality and technical level, and contribute more to the development of China's power transmission and transformation cause.

Nanyang Xinte Electrical Co., Ltd. actively participates in 2024 Shanghai International Electrotechnical Exhibition(EP shanghai 2024), showing innovative strength.

On December 5 - 7, 2024, the 32nd Shanghai International Electric Power Equipment and Technology Exhibition (EP 2024 Shanghai ) and Shanghai International Energy Storage Technology Application Exhibition were grandly held in Shanghai New International Expo Center. Nanyang Xinte Electrical Co., Ltd. as an important participant in the power industry, the company's international business department team actively appeared in the exhibition, enthusiastically and the guests from all over the world on-site communication to enhance understanding. In this exhibition, Nanyang Xinte Electrical Co., Ltd. demonstrated its strength and achievements in the field of intelligent power transmission and transformation equipment. The company's team had a warm exchange with the clients from different countries, shared Nanyang Xinte Electrical Co., Ltd. 's innovative practices and successful cases in the power industry, and answered the questions encountered by the audience in practical applications. This type of interactive communication not only enhances the communication and trust between Sintek and customers, but also builds a good platform for technical exchange and cooperation in the industry. The participation in Shanghai International Electricity Exhibition（EP 2024 Shanghai) is an important opportunity for Nanyang Xinte Electrical Co., Ltd. to display its brand image, expand its market channels and strengthen the communication in the industry. In the future, Nanyang Xinte Electrical Co., Ltd. will continue to uphold the concept of innovation-driven development, increase investment in research and development, and constantly improve the quality of products and services, and make greater contributions to the development of the global power industry.

Good news of winning the tender! Nanyang Xinte Electric Co., Ltd. was honored to be on the bidding list of China State Grid, with a total amount as high as 12 million yuan!

Recently, it was learned from the China State Grid E-Commerce Platform (ECP) that Nanyang Xinte Electrical Co., Ltd. successfully won the bid for the 55th batch of procurement of China State Grid in 2024 (the fourth bidding and procurement of substation equipment (including cables) for transmission and transformation projects). The transformer series products won the bid of China State Grid Henan Company with a bid amount of up to 12 million yuan!

Xinte Electric successfully won the bid for the second public bidding and procurement project of distribution network material agreement inventory of China State Grid Shanxi Electric Power Company in 2024!

On June 12, 2024, in the second public procurement project bidding for distribution network materials agreement inventory of China State Grid Shanxi Electric Power Company in 2024, Nanyang Xinte Electrical Co., Ltd. successfully won the bid with a contract amount of 14.020136 million RMB!

Nanyang Xinte Electrical Co., Ltd. successfully won the bid for the 40th batch of procurement of China State Grid Corporation in 2024.

On July 9, 2024, it was learned from China State Grid System Platform that in the 40th batch of procurement of China State Grid Co., Ltd. in 2024 (the third transformation equipment (including cables) bidding and procurement project for power transmission and transformation projects, Nanyang Xinte Electrical Co., Ltd. successfully won the bid for Bidding project No. 75, with a winning bid amount of RMB 14.4188 million! In addition, Nanyang Xinte Electrical Co., Ltd. has been successfully shortlisted for China Southern Power Grid Co., Ltd.'s 10KV prefabricated box-type transformer, 10KV dry-type transformer, 10KV oil-immersed transformer (except amorphous alloy), and 35KV transformer pre-qualification projects. The achievements are inseparable from the hard work and redoubled efforts of the company leaders and employees! The company will work together to achieve greater success in the second half of 2024 with fuller enthusiasm and higher morale!

Nanyang Xinte Electrical Co., Ltd. was successfully shortlisted as the winning candidate for the first distribution network materials bidding and procurement project of China State Grid Liaoning Electric Power Co., Ltd. in 2024!

Announcement from China State Grid Liaoning Electric Power Co., Ltd. In mid-April 2024, Nanyang Xinte Electrical Co., Ltd. was successfully shortlisted for the State Grid Liaoning Electric Power Company’s first distribution network material agreement inventory bidding and procurement project recommendation in 2024. As a result, the winning bid price was nearly 15 million yuan.

Warmly congratulate Nanyang Xinte Electrical Co., Ltd. successfully selected “Henan provincial green factory” list.

News from the Energy Conservation and Comprehensive Utilization Department of the Department of Industry and Information Technology of Henan Province, China, on May 6, 2024, according to the results of the 2024 provincial-level green manufacturing system construction review in Henan Province, we Nanyang Xinte Electrical Co., Ltd. was successfully shortlisted List of "Henan Provincial Green Factories".

Good news spreads frequently, Nanyang Xint Electric Co., Ltd. successfully won the bid for the second e-commerce competitive negotiation procurement of sporadic power grid materials of China State Grid Henan Electric Power Company in 2023

Nanyang Xint Electric Co., Ltd. successfully won the bid for the second e-commerce competitive negotiation procurement of sporadic power grid materials of China State Grid Henan Electric Power Company in 2023

Good news! Nanyang Xint Electrical Co., Ltd. won the bid successfully for the 83rd procurement of China State Grid Co., Ltd. in 2023

Nanyang Xint Electrical Co., Ltd. successfully won the bidding and procurement of China State Grid