Protective Device Coordination

A comprehensive Coordination-Study assures the proper selection and installation of overcurrent protective devices and settings to detect and clear a range of overcurrent and short-circuit currents. The device trip functions are set to sequentially operate with other protective devices to isolate and clear faults with minimum power disruption to other parts of the system. Graphical Time Current Characteristic (TCC) Curves are used to determine the optimum settings and coordination between protective devices. Each TCC curve includes as small section of the riser diagram to identify where the protective devices are located in the electrical system. The TCC Curves are also used to identify areas where the system is exposed to potentially damaging fault currents and to assure system protection.

A written TCC Commentary is provided to describe the as-found settings and the existing coordination. The commentary includes recommend settings to improve the coordination and protection for cables, transformers, and other components. The As-Found & Recommended Settings are listed in a user friendly settings report that highlight the individual setting changes for easy onsite application. Operating scenarios help to verify selectivity between alternate feeder circuit breakers and the clearing time intervals between protective relays during normal and emergency power, and maintenance operations. See moreā€¦

The Coordination Study Benefits:

  • TCC Commentary that describes your coordination and protections.
  • A Protective Device Settings Report to compare As-Found and Recommended Settings (setting changes are highlighted for field application)
  • Improve System Protection to prevent potential loss and equipment damage.
  • Avoid Nuisance Tripping due to over current or mis-coordination
  • Isolate Faults & Minimize damage and outages

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