Transformer explodes at Ives Dairy substation in Miami, Florida
2001Published 29 Oct 2026Responsible editor: Chief Editor
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What happened
In early 2001, a breaker at the Ives Dairy Substation in Miami, Florida, tripped open after a surge and malfunctioned, creating an arc fault between the hot lead and a ground point. The arc drew far more current than the facility was designed to carry. The arc heated the mineral oil coolant in the primary transformer until it boiled in a flammable state, raising pressure until the seals failed. Oil vapour escaped and ignited on the arc fault, and the flames travelled back to the transformer tank, igniting the oil inside and causing the substation to explode in a large fireball.
The loss of coolant caused the transformer internals to melt, which blew the main high-voltage fuse and extinguished the arc. The account is based on a news wire item that describes a 37-second video of the event. The source does not report injuries, outages or damage costs.
Contributing factors
The source states that a surge caused the breaker to trip and that the breaker then malfunctioned, creating the arc fault. It does not describe the cause of the surge or any maintenance history.
Lessons learned
- Test and maintain circuit breakers and protective devices so that they clear faults reliably and do not fail to interrupt a surge.
- Monitor transformer oil temperature and pressure, and fit pressure relief and alarms so that overheating is detected before seals fail.
- Design substations with oil containment, fire barriers and adequate separation between transformers so that a single transformer fire does not spread to the wider site.
More lessons on electrical protection and isolation, detection and monitoring, spacing, layout and fire spread, from every incident on the register.
Source
Other entries that name Miami
Published 2026-10-29. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
