This guide identifies appropriate voltage sag indices and characteristics on electrical power and supply systems as well as the methods for calculating them. Methods are provided for quantifying the severity of individual voltage sag events (single-event characteristics), for quantifying the performance of multiple events at a specific location (single-site indices), and for quantifying the performance of multiple events for the whole system (system indices). The methods are appropriate for use… read more in 50/60 Hz transmission, distribution, and utilization electric power systems, though there may be applications to systems with other fundamental frequencies. read less
This guide identifies distribution reliability indices and factors that affect their calculation. It includes indices, which are useful today, as well as indices that may be useful in the future. The indices are intended to apply to distribution systems, substations, circuits, and defined regions.
This standard specifies system reliability indices for telecommunication systems. The indices apply to telecommunication systems and defined regions. A statement of the basic concepts is followed by definition, formula and influencing factors of indices. This standard does not cover network security and configuration.