theguardian.com
Heathrow fire caused by preventable fault, report finds, as Ofgem launches investigation into incident – business live
Root cause of fire at substation was ‘preventable, technical fault’ most likely caused by moisture, report says
Akshay Kaul, director general for infrastructure at Ofgem, said:
The North Hyde substation fire resulted in global disruption, impacted thousands of local customers, and highlighted the importance of investment in our energy infrastructure.
As a result of the report’s findings, we have opened an investigation into National Grid Electricity Transmission (NGET). We have also commissioned an independent audit of their most critical assets.
This review has seen evidence that a catastrophic failure on one of the transformer’s high voltage bushings at National Grid Electricity Transmission’s 275kV substation caused the transformer to catch fire.
This was most likely caused by moisture entering the bushing, causing an electrical fault. An elevated moisture reading in the bushing had been detected in oil samples taken in July 2018 but mitigating actions appropriate to its severity were not implemented. Continue reading...