Time-domain based protective relaying is now a reality today due to modern microprocessor technology, higher sampling rates, and high resolution recordings of real world faults used to develop complete algorithms.  But with this new technology comes a new skill set.  Protection engineers are very familiar with the concepts of phasor based protection and the protective relaying algorithms that use phasors as operating, polarizing, and restraint quantities.  But time-domain protection algorithms work on different principles.  They respond to different operating, polarizing, and restraint quantities, and as such they must be tested differently.  This presentation will cover some basic theory of time-domain based line protection and how these elements can be tested using traditional secondary injection test sets.

Biography:

Jeremy Blair, P.E., earned his B.S.E.E. from Louisiana Tech University and his M.S.E.C.E. from Georgia Institute of Technology. He is a licensed professional engineer in the state of Louisiana.  Jeremy spent 9 years as a Distribution Engineer at Entergy Corporation with responsibilities in protection, power quality, automation and distribution system planning.  He then joined Schweitzer Engineering Laboratories, Inc. as an Application Engineer in 2013, providing training, education, and technical guidance for customers in the Southeastern United States