Patterson Power Engineers, LLC      



Protective Relaying

Our primary focus is setting calculations for protective relays for generator and power system protection as well as the analysis of the operation of these systems.  We are among the best in our profession.

Relay Setting Calculations
We develop relay settings for all types of protective relays in protection of all types of power system equipment from nuclear generator protection down to distribution reclosers.  We will adhere to your company policies on application of protection or in their absence we apply methodologies that meet or exceed recognized industry standards and practices.  We also provide review of existing settings for adherance to NERC PRC reliability standards (e.g. PRC-019, PRC-024, PRC-025 etc.).


Electrical design.


Wide Area Coordination Studies
Lessons learned from the Northeast Blackout of 2003 have underscored the importance of proper application, setting, and coordination of power sytem protection.  With the advent of computing platforms like CAPE we are able to simulate protective relays and systems in great detail to analyze, prove, and improve the application of protective relays.  Performing analysis that could never have been done before by hand but are easily facilitated by todays computers.


Fault Event Analysis
Our team has some of the best analysis engineers in the business.  Detailed analysis frequently finds gaps or deficiencies in protective relay applications even if operations appeared "normal".  This allows generator and/or transmission system owners to prove the adequacy of their protection systems as well as to improve them when possible.



Services We Provide

  • Protective relaying
  • Wide area coordination studies
  • Transient analysis and studies
  • Power quality analysis
  • Electrical generation expert consultation
  • Expert witness