1、 24 January 2003 Insert to SH94930IEEE Std 242-2001(Revision ofIEEE Std 242-1986)Corrections to:IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power SystemsSponsorIndustrial and Commercial Power Systems Departmentof theIEEE Industry Applications SocietyCorrect
2、ion SheetIssued 24 January 2003The following corrections should be made:Page 296:The titles of Table 9-3b and Table 9-3c should be exchanged. Also, 600 kV in bothtitles should be corrected to 600 V. Following are the corrected tables. Table 9-3bEstimated clearing times of protective devices: power c
3、ircuit breakers, 600 V and belowFrame size225600 A 16004000 AInstantaneous (cycles) 23 3Short time (cycles) 1030 1030Long time (s) over 100Ground fault (cycles) 1030 1030Table 9-3cEstimated clearing times of protective devices: molded-case circuit breakers, 600 V and belowFrame size100 A 2251200 A1001200 A(current limiting)Instantaneous (cycles) 0.51 11.5 Less than 0.5Long time (s) over 100
