In the field of oil-immersed transformer production and sales, we have long-term cooperation with many foreign power companies, EPC contractors and industrial customers, and found that customers often consult how to select suitable oil-immersed transformers according to the project.Relying on 18 years of export experience, Kechang Electric has compiled this procurement proposal to help everyone choose products that are reliable in operation, have outstanding energy efficiency and are durable.
1. According to the project load selection, reserve expansion space
At present, many customers only choose transformers according to the current load, regardless of the hidden dangers of project development and equipment increase. In this case, overload can easily occur, which in turn affects the normal operation of power transformers, shortens the service life, and even causes safety accidents; therefore, the choice of capacity is to reserve the capacity for future use, but the capacity must also be reserved appropriately.Avoid increasing initial procurement costs and equipment losses.
2. Clarify the voltage level and match the project requirements
According to many years of export experience, there are differences in the corresponding national grid standards and voltage diversification in different countries and regions.Then the customer must avoid situations where the voltage level of the transformer does not match the actual requirements of the project, so as to prevent situations that cannot be compatible with the power grid and affect the advancement of the project.Therefore, buyers need to confirm the following information before purchasing：
- Rated voltage on the primary and secondary sides
- The tap range and adjustment requirements allow the transformer to adjust the output voltage within a certain range to adapt to different load requirements and grid voltage fluctuations.
- The voltage frequency is 50Hz or 60Hz. For example, Europe, Asia, Africa, South America and other regions are mostly 50Hz, and North America is mostly 60Hz. Accurate voltage configuration can ensure compatibility and avoid problems.
3. Combine the use environment and select the cooling method
The cooling effect plays a decisive role in the operating reliability and life of the transformer. Under normal operating conditions, ONAN oil-immersed transformers are widely used and cost-effective, but when large-capacity equipment is operating or the installation ambient temperature is high, it is recommended to choose ONAF or OFAF cooling system.ONAF increases forced air cooling on the basis of natural circulation to improve heat dissipation efficiency; OFAF is forced air cooling by forced oil circulation, which has better heat dissipation effect and can stably control the operating temperature of the equipment to ensure safe working conditions.
4. Control the quality of insulation and mineral oil
The quality of the insulation materials and mineral oils used by suppliers will directly affect the service life and long-term operating reliability of power transformers.If the quality of the insulation material is poor, the equipment is prone to partial discharge and even short circuit failure, which directly causes damage to the transformer.In the production of transformer oil, vacuum drying and oiling processes should be used to strictly remove water vapor and gas from the material to ensure the cleanliness of the transformer oil, thereby reducing the risk of partial discharge and prolonging the service life of the equipment.
5. Jump out of the purchase unit price and evaluate energy efficiency based on life cycle costs
Most buyers only focus on procurement costs, but power transformers are long-term operating power equipment. Maintenance costs and power loss costs will be incurred during use. The initial procurement cost of low-loss transformers may be slightly higher, but they can reduce power loss and save operating costs in the long term.When purchasing, choose a transformer with low no-load loss and load loss; if the loss is high, the transformer may need to be replaced in 5 years, which will increase the procurement cost.
6. Optimize the manufacturer of the whole process technical support
Transformer procurement projects require full-cycle technical support, and reliable suppliers must be selected to improve the efficiency of project promotion when purchasing.Kechang Electric has a wealth of project experience and a perfect service system. It can provide customers with customized services. It has provided supporting project drawings and can send professionals to guide online installation. Kechang Electric's expertise supports customers to avoid project risks and ensure long-term stable operation of equipment.
The key to procurement is not only to choose equipment, but also to choose manufacturers who understand the needs and have accumulated experience. We hope these suggestions can help customers choose the most suitable oil-immersed transformer for the project.
