IEEE C37.302-2015 IEEE Guide for Fault Current Limiter (FCL) Testing of FCLs Rated above 1 000 V AC

IEEE C37.302-2015 IEEE Guide for Fault Current Limiter (FCL) Testing of FCLs Rated above 1 000 V AC. 3.5 Definitions related to currents without limitation by an FCL This clause pertains to currents at levels above the rated continuous current that do not meet the initiation criteria of an FCL. branch short-time withstand current: The rms value of the current that a specific branch of the FCL can carry in the C mode, evaluated during the first- and last three full half-cycles under prescribed conditions of use and behavior without limitation by the FCL. NOTE—The branch ID number is denoted by the value of the subscript “n”. peak withstand branch current: The peak current associated with the first major loop of the short-time withstand current that a specific branch of the FCL can carry in the C mode. peak withstand current: The peak current associated with the first major loop of the short-time withstand current. short-time withstand current in C mode: The rms value of the current that the FCL can carry in the C mode. NOTE—The actual current is expected to stay within the bounds of the two rated short-time withstand current values. 3.6 Fault currents or over-currents with limitation by an FCL This clause pertains to currents at levels that meet the initiation criteria of an FCL. limited short-circuit withstand branch current: The rms value of the current that a specific branch path of the FCL can carry with the FCL in CL mode, evaluated out of the first- and last three full half-cycles. limited short-circuit withstand current: The rms value of the current that the FCL can carry in the CL mode, evaluated during the first- and last three full half-cycles, under prescribed conditions of use and behavior. 3.7 FCL recovery processes and associated times C mode recovery status: The FCL being in C mode after a fault event and regaining rated current limiting but reduced continuous current carrying capability. See also: FCL recovery process. NOTE—See Figure 4 in FCL recovery processes and associated times. C mode recovery time: r t ∆ is the amount of time required between the clearing of a rated fault event to the moment when the FCL regains C mode recovery status. See also: FCL recovery process. NOTE—See Figure 4 in FCL recovery processes and associated times. IEEE C37.302 pdf download.