What is the purpose of a PCB screening test for transformer oil?

The purpose of a PCB screening test for transformer oil is to detect the presence of polychlorinated biphenyls (PCBs), which are hazardous substances. This test is crucial for ensuring compliance with environmental regulations and assessing the safety of transformer oil. High levels of PCBs can indicate contamination, posing risks to both human health and the environment, thus necessitating proper management and disposal of the transformer oil.