The best example of this condition is automotive load dump, where there is a sudden break in the connection to the battery caused by vibration and corroded terminals.
In automotive, industrial and avionic applications, high voltage power supply spikes with durations ranging from a few microseconds to hundreds of milliseconds are commonly encountered. The electronics within these systems must not only survive transient voltage spikes, but in many cases also operate reliably throughout the event. In systems where power is distributed over long wires, severe transients are generated by load steps (abrupt changes in load current).
Linear Technology, High Voltage Surge Stoppers, load dump