## Oil-immersed vs Dry-type Box Substation for Solar PV Projects

With the rapid development of distributed photovoltaic power generation, box substations have become the core power conversion and grid-connected equipment for rooftop and ground solar projects.

Oil-immersed PV Box Substation

It has strong overload capacity, excellent heat dissipation and lower cost. Suitable for open ground photovoltaic power stations with good ventilation and fire isolation conditions. It is the most cost-effective solution for large-scale centralized solar projects.

Dry-type PV Box Substation

Dry-type transformer inside, flame-retardant and oil-free, safer for building adjacent installation. Suitable for rooftop distributed PV, factory building side installation and densely populated areas. It requires less daily maintenance and meets strict fire protection and grid-access standards.

Conclusion

Ground photovoltaic projects prefer oil-immersed box substations; rooftop industrial photovoltaic projects prefer dry-type box substations for higher safety.