One of the seven main types of power problems is an interruption. An interruption is a total loss of power for a specific, short period of time. The power loss can range from a fraction of a second to over two minutes. Interruptions happen when the electric power grid is damaged by weather disturbances, such as lightning strikes and strong winds, among others.
Interruptions are classified according to how long the total power loss lasts. Instantaneous interruptions last for less than a second. Temporary or momentary interruptions can last up to two seconds while interruptions lasting for over two minutes are called sustained interruptions.
While power grids have backup systems to make up for issues leading to power interruptions, there is no such thing as a perfect system. Aside from weather disturbances, interruptions can also be caused by equipment failure. Automatic circuit reclosers can also cause power interruptions. These devices shut off power when the system detects an increase in current due to a short circuit in the system. Cutting off the power protects the whole system from possible damage. The power will be put back on by the recloser after a certain period of time.
Power interruptions can cause data loss, lost revenue and downtime for computer systems. To deal with this power problem, it is necessary to invest on an efficient uninterruptible power supply system as well as a generator. A UPS will allow equipment to continue running even after a complete loss of power is experienced since they provide continuous power supply to the critical equipment. To ensure protection against power interruptions, it is also necessary for the battery of the UPS to be fully functional.
References:
http://www.on365.co.uk/Power__and__Cooling/Most_Common_Power_Problems.aspx
http://www.apcmedia.com/salestools/VAVR-5WKLPK/VAVR-5WKLPK_R1_EN.pdf?sdirect=true
https://www.tripplite.com/support/articles/articleid/common-power-problems