Rare, but catastrophic
Substation fires can take out supply for tens of thousands of customers, destroy assets worth millions and endanger personnel. They are rare events — which is exactly why purely statistical maintenance schedules don’t protect against them.
Fires announce themselves electrically
Most substation fires start from a small set of electrical failure modes: insulation breakdown, overheating connections, partial discharge and evolving earth faults. Each of these produces characteristic signatures in current and voltage waveforms — often weeks before thermal runaway:
- Partial discharge shows up as repetitive micro-transients clustered around voltage peaks.
- Degrading insulation produces intermittent earth faults that self-clear in milliseconds — invisible to protection relays, visible in raw waveforms.
- Loose or corroded connections modulate current with characteristic patterns as contact resistance varies with temperature.
Why reactive and calendar-based maintenance fall short
Traditional approaches inspect substations on a fixed schedule and respond to failures after they happen. But the failure modes behind substation fires don’t follow the calendar — a joint can degrade from healthy to critical between two inspection rounds, and a reactive strategy by definition arrives after the damage. Predictive fault analytics inverts this: the substation’s own disturbance recordings are screened continuously, so the maintenance visit happens when the data says the risk is rising — not when the schedule says it’s due.
Why measurement resolution matters
These signatures live in the details. At standard sampling rates they blur into noise; at megahertz resolution they are unmistakable. This is why our Härryda Energi deployment streams waveforms at 2 MHz — millions of measurements per second — and why the models behind IntelliView® are trained to recognize the precursors, not just the failures.
From detection to prevention
When the platform flags an evolving fault with its root cause and location, a planned inspection replaces an emergency. In the best case, nobody outside the maintenance team ever knows how close the grid came to a very bad day.