With the acceleration of global urbanization, the construction of urban power grids is entering a high-quality development stage. Urban substations, as the core nodes of power transmission and distribution, are increasingly close to residential areas, commercial centers and public facilities. This proximity puts forward strict requirements on the environmental performance of power equipment, especially noise control. As a leading manufacturer of power transmission and distribution equipment, Hubian Electric has developed a 10kV dry-type transformer with a noise level of less than 55dB specifically for urban substation scenarios. This product integrates low-noise design, environmental protection, safety and high reliability, effectively solving the noise pollution problem of traditional transformers in urban environments, and providing a high-quality power guarantee for urban construction and people's livelihood development. With its outstanding performance advantages, it has become a preferred choice for urban substation renovation and new construction projects.
1. Product Overview: Core Advantages of 10kV Dry-type Transformer
Hubian Electric's 10kV dry-type transformer is a key equipment for low-voltage power transmission and distribution systems in urban areas, mainly composed of iron core, winding, clamping structure, insulation system and cooling device. Different from traditional oil-immersed transformers, this dry-type transformer adopts air insulation and natural cooling or forced air cooling mode, which eliminates the potential safety hazards of oil leakage and fire, and is particularly suitable for the dense population and complex environment of urban substations. The product adheres to the design concept of "environmental protection, energy saving and low noise", and has significant advantages in noise control, energy efficiency and structural design, fully meeting the relevant standards and application requirements of urban power grids.
In terms of core components, the transformer's iron core is made of high-grade grain-oriented silicon steel sheets with high magnetic permeability and low loss. The silicon steel sheets are cut with high-precision equipment, and the burrs on the cutting surface are treated with resin coating (thickness 50μm~100μm) to eliminate internal stress and reduce noise caused by magnetostriction. The iron core adopts a multi-level stepped joint structure, which makes the magnetic flux distribution more uniform, reduces the magnetic density in the air gap, and reduces the noise by 4dB(A)~5dB(A) compared with the traditional two-pole joint core. At the same time, the design of the iron core's clamping force is optimized. By precisely adjusting the torque of the bolts at both ends of the clamp, the through bolts and the pressure nails of the pad, the natural frequency of the iron core is avoided to be close to the vibration frequency caused by magnetostriction, thus preventing resonance and further reducing noise. For large-capacity models, Hubian Electric also uses ultra-high-grade oriented silicon steel sheets (such as JFE's JNEX series), which can reduce the magnetostriction expansion and contraction by 40% under the same magnetic density condition, and reduce the noise by an additional 2dB(A)~4dB(A).
The windings of the transformer adopt epoxy resin casting technology or vacuum pressure impregnation technology. The windings cast with epoxy resin have excellent insulation performance, mechanical strength and moisture resistance, and can operate stably in the humid environment of urban substations. The winding conductor is made of high-purity oxygen-free copper, which has low resistance and low energy loss. The winding structure is designed as a cylindrical or continuous type, which not only ensures sufficient heat dissipation area, but also reduces the vibration caused by electromagnetic force during operation. In addition, the transformer is equipped with a high-efficiency cooling system. For small and medium-capacity models, natural air cooling is adopted; for large-capacity models, forced air cooling is optional. The cooling fan adopts low-noise design, which will not increase the overall noise burden of the transformer, ensuring that the noise level is always controlled below 55dB(A) during operation.
2. <55dB Low-noise Design: Customized Adaptation to Urban Substation Environment
Urban substations are often located in the core areas of the city, adjacent to residential buildings, schools, hospitals and commercial plazas. The noise generated by power equipment will directly affect the living environment and quality of life of nearby residents. According to the national environmental protection standards, the noise limit of urban Class 1 areas (residential areas, cultural and educational areas) during the day is 55dB(A), and at night is 45dB(A). Hubian Electric's 10kV dry-type transformer has a noise level of less than 55dB(A), which fully meets the daytime noise limit of urban Class 1 areas and is close to the night limit, making it an ideal choice for urban substations.
The noise of dry-type transformers mainly comes from the vibration of the iron core caused by magnetostriction, the vibration of the windings caused by electromagnetic force, and the vibration of the shell and cooling system. In response to these noise sources, Hubian Electric has adopted a comprehensive low-noise control scheme. In addition to the iron core and winding optimization measures mentioned above, the transformer is also equipped with elastic damping pads between the iron core feet and the bottom of the box. These damping pads are made of high-quality rubber materials, which can bear a pressure of 2.7MPa~3.0MPa, effectively absorbing the vibration generated by the iron core and preventing the vibration from being transmitted to the base and the ground to form structural noise. The shell of the transformer is made of high-strength steel plates, and sound insulation materials are added inside the shell to further block the transmission of noise. The connection parts of the shell are sealed and reinforced to avoid noise leakage caused by vibration gaps.
Actual operation tests show that under the rated load condition, the noise level of Hubian Electric's 10kV dry-type transformer is between 48dB(A) and 54dB(A), which is lower than the industry average of 60dB(A) for similar products. Even when the transformer is in full-load operation and the cooling fan is turned on, the overall noise level does not exceed 55dB(A). This low-noise performance allows the transformer to be installed in urban substations without additional noise reduction measures, greatly reducing the construction cost and floor space of the substation, and improving the compatibility of the substation with the surrounding environment.
3. Compliance with Urban Power Grid Certification and Standards
Urban power grids have strict requirements on the safety, reliability and environmental protection of power equipment. To ensure the smooth application of products in urban substation projects, Hubian Electric's 10kV dry-type transformer has passed a number of international and domestic certifications, fully complying with the relevant standards of urban power grids.
Internationally, the product meets the requirements of IEC 60076 (Power Transformers) and IEC 61558 (Power Transformers and Reactors for General Applications) standards, ensuring international compatibility and technical advancement. It has obtained CE certification in the European Union, UL certification in the United States and other international certifications, which can meet the import requirements of urban substation projects in different countries and regions. Domestically, the product complies with GB 1094.1-2013 (Power Transformers - Part 1: General Requirements) and GB 1094.6-2011 (Power Transformers - Part 6: Requirements for Dry-type Transformers) standards, and has passed the CQC energy efficiency certification, reaching the level 2 energy efficiency standard, which is in line with the national policy of energy conservation and emission reduction for urban power grids.
In addition, the product has also passed the environmental impact assessment test, and its noise, electromagnetic radiation and other indicators fully meet the environmental protection standards for urban construction projects. The epoxy resin used in the windings is a non-toxic and environmentally friendly material, which will not cause pollution to the environment during production, operation and disposal. The product labels and operation manuals are provided in both Chinese and English, which is convenient for the installation, operation and maintenance of domestic and foreign urban substation projects, and improves the applicability of the product.
4. Application Value and Market Prospects in Urban Substations
With the deepening of urbanization and the continuous upgrading of urban power grids, the demand for low-noise, environmentally friendly and safe power transformers is growing rapidly. According to the data released by the International Energy Agency (IEA), the global investment in urban power grid renovation will exceed 2 trillion US dollars by 2035. Urban substations, as an important part of urban power grids, have huge demand for transformer renewal and replacement. Hubian Electric's 10kV dry-type transformer with noise level <55dB is widely applicable to various urban substation scenarios, including residential area supporting substations, commercial center substations, industrial park substations, and public facility substations (such as hospitals, schools, and stadiums).
In residential area supporting substations, the low-noise performance of the transformer ensures that it will not affect the daily life and rest of residents, improving the living comfort of the community. In commercial center substations, the transformer's compact structure and fire safety characteristics (no oil) make it suitable for installation in underground or indoor substations, saving floor space and ensuring the safety of commercial facilities. In public facility substations such as hospitals and schools, the environmental protection and low-noise advantages of the transformer are in line with the high environmental requirements of these places, providing a quiet and safe power environment for medical treatment and teaching.
In terms of market strategy, Hubian Electric not only provides high-quality products, but also focuses on providing customized solutions for urban substation projects. According to the specific location, load capacity and environmental requirements of the substation, the company's professional technical team can adjust the product parameters and structural design to meet the individual needs of the project. At present, the product has been successfully applied in a number of urban substation renovation and new construction projects in Beijing, Shanghai, Guangzhou and other major cities in China, and has also been exported to Southeast Asia, Europe and other regions, winning wide praise from customers for its reliable performance and excellent low-noise effect.
5. Service Guarantee and Future Commitment
Hubian Electric has always adhered to the concept of "quality first, customer-oriented", and provided a full range of service guarantees for the application of 10kV dry-type transformers in urban substations. Before sales, the company's technical team conducts on-site surveys of the substation site, communicates in depth with customers to understand the project's load characteristics, environmental constraints and operation requirements, and provides professional product selection suggestions and customized solutions. During the sales process, the company dispatches experienced engineers to the site to guide the installation and commissioning of the transformer, ensuring that the product is put into operation smoothly and meets the design requirements.
After sales, Hubian Electric has established a 24-hour customer service hotline and a professional after-sales service team. For any faults or problems during the operation of the transformer, the after-sales team can arrive at the site in the shortest time to carry out maintenance work. The company provides a long-term supply of spare parts, ensuring that the spare parts required for transformer maintenance can be delivered in a timely manner. The product also has a long quality guarantee period. During the guarantee period, the company regularly conducts return visits and preventive maintenance on the transformer, monitors the operation status of the product in real time, and ensures the long-term stable and reliable operation of the transformer.
Looking to the future, Hubian Electric will continue to increase investment in technological research and development, focusing on the development of more intelligent, efficient and low-noise power transformers. In response to the development needs of smart urban power grids, the company will integrate digital technologies such as online monitoring, fault prediction and remote control into the 10kV dry-type transformer, realizing real-time monitoring of the transformer's operation status, temperature, noise and other parameters, and improving the intelligent operation and management level of urban substations. At the same time, the company will further expand the international market, strengthen cooperation with global partners, and contribute more to the construction of green, low-carbon and intelligent urban power grids around the world.
In conclusion, Hubian Electric's 10kV dry-type transformer with noise level <55dB is a high-quality power equipment tailored for urban substation scenarios. With its advanced low-noise design, reliable safety performance, compliance with international and domestic standards and perfect service guarantee, the product has significant advantages in the urban power grid market. In the context of the vigorous development of urbanization and urban power grid upgrading, Hubian Electric is willing to work with customers at home and abroad to create a more environmentally friendly, safe and efficient urban power system and contribute to the sustainable development of urban economy and society.
