It's more about safety than reconnection: when repairing lines, it's much more manageable to "lock and tag out" the upstream side than all the distributed generation, especially in emergencies.
Any lines being worked on will be shorted (ie. all conductors joined together and to ground).
As long as that is always done, islanding doesn't present any human safety concerns.
That is normally done anyway, because plenty of utility breakers will automatically try to reconnect every few minutes (allowing some grid scale failures to repair themselves with no human involvement).
As long as that is always done, islanding doesn't present any human safety concerns.
That is normally done anyway, because plenty of utility breakers will automatically try to reconnect every few minutes (allowing some grid scale failures to repair themselves with no human involvement).