<Ul> <Li> A permanent fault is a massive loss of power typically caused by a fault on a power line . Power is automatically restored once the fault is cleared . </Li> <Li> A brownout is a drop in voltage in an electrical power supply . The term brownout comes from the dimming experienced by lighting when the voltage sags . Brownouts can cause poor performance of equipment or even incorrect operation . </Li> <Li> A blackout is the total loss of power to an area and is the most severe form of power outage that can occur . Blackouts which result from or result in power stations tripping are particularly difficult to recover from quickly . Outages may last from a few minutes to a few weeks depending on the nature of the blackout and the configuration of the electrical network . </Li> </Ul> <Li> A permanent fault is a massive loss of power typically caused by a fault on a power line . Power is automatically restored once the fault is cleared . </Li> <Li> A brownout is a drop in voltage in an electrical power supply . The term brownout comes from the dimming experienced by lighting when the voltage sags . Brownouts can cause poor performance of equipment or even incorrect operation . </Li> <Li> A blackout is the total loss of power to an area and is the most severe form of power outage that can occur . Blackouts which result from or result in power stations tripping are particularly difficult to recover from quickly . Outages may last from a few minutes to a few weeks depending on the nature of the blackout and the configuration of the electrical network . </Li>

When is the name of the electrical disturbance that happens with an extended reduction of power