What are the effects of PCBs in transformer oil used in power transformers?

The effects of PCBs in transformer oil used in power transformers include environmental contamination and health risks. PCBs can accumulate in the ecosystem, leading to bioaccumulation in wildlife and potential carcinogenic effects in humans. Additionally, the presence of PCBs can degrade the insulating properties of transformer oil, compromising the performance and safety of power transformers. Regulatory concerns also arise due to the toxic nature of PCBs, prompting stringent disposal and management practices.