In power engineering projects, prefabricated substations serve as core power distribution units, and their selection directly impacts the stability, safety, and economic benefits of the entire power supply system. Faced with a dazzling array of products and vastly different prices on the market, how can one make an informed choice? Henan He Electric Co., Ltd., drawing on years of experience in original manufacturing, has compiled this [Prefabricated Substation Selection Guide] for you.

Electrical Parameters

The voltage level should be strictly determined based on the high-voltage power supply at the project site (e.g., 10kV). The core issue is load calculation: It is essential to accurately calculate the load of all electrical equipment and reserve a reasonable margin for future expansion.

• Simplified Reference: For a small factory with a load limit of 800kW, based on a power factor of 0.8, a 1000kVA transformer is recommended, meeting current needs while allowing for future expansion.

• Short-Circuit Current: This needs to be calculated based on grid parameters to determine the dynamic and thermal stability parameters of the internal components of the transformer (e.g., circuit breakers, disconnectors). This is a crucial safety feature.

Transformer Types

• Oil-immersed transformers: Excellent heat dissipation, economical price, and good fire resistance. However, they require regular maintenance and pose a risk of oil leakage. They are typically suitable for outdoor locations with high fire safety requirements and dedicated maintenance teams.

• Dry-type transformers: Flame-retardant, explosion-proof, and maintenance-free, offering greater installation flexibility, especially suitable for indoor environments with stringent safety requirements such as high-rise buildings, subways, and shopping malls. Although the initial cost is higher, the overall maintenance cost is lower.

    Heshan Electric Co., Ltd. offers a complete range of electrical equipment products. Our products are widely used in factories, enterprises, communities, data centers, and other settings. For common power distribution needs, Heshan Electric Co., Ltd. has mature design solutions, and for special power consumption scenarios, we also have advanced technology to provide customized services. Professional technical services and high-quality electrical products have earned Heshan Electric widespread praise among our customers.