What is the function of a transformers oil pan in spill containment?

An oil pan provides secondary containment under a transformer to capture leaks and prevent oil from reaching soil, drains, or water. It reduces environmental damage and supports safe cleanup. Oil pans can be integrated with bund walls, liners, and oil water separation systems. In substations, containment is often sized to hold the full oil volume plus rainwater allowance. A well designed pan also supports inspection and maintenance by making leaks visible early and limiting fire spread pathways.