Time-Current Curves - IEEE
Time-Current Curves
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Protective Device Coordination
Protective Device Coordination StudyDescription: ? An organized time-current study of protective
devices from the utility to a device. ? A comparison of the time it takes protective
devices to operate when certain levels of normal or abnormal current pass through them.
2
Protective Device Coordination
Protective Device Coordination StudyObjective: ? Determine the characteristics, ratings, and
settings of overcurrent protective devices ? Ensure that the minimium, un-faulted load is
interrupted when the protective devices isolate a fault or overload anywhere in the system.
3
Protective Device Coordination
Protective Device Coordination StudyResults: ? Selection of instrument transformers ratios ? Protective relay characteristics and settings ? Fuse ratings ? LV circuit breaker ratings, characteristics, and
settings.
4
Protective Device Coordination
Protective Device Coordination StudyFrequency: ? This study should be revised as new protective
are added or as existing devices are modified. ? At a minimum, it is recommended that this
study be performed every 5 years.
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