Class 2 of 8: Advanced Transformer Differential Testing (87T). This self-paced class covers 87T testing on modern relays: vector groups and compensation, TAP and mismatch, slope and minimum pickup tests, harmonic restraint, and finding common differential errors, plus a field walkthrough and a case study. It has about 45 minutes of lesson content plus video activities and a 30-question quiz. It is part of the SubstationU.com Protective Relaying Series, Advanced Protective Relaying (Level 3 course). Continuing education credit: 0 (none awarded yet).
Read the lesson book and complete the video activities, then pass the 30-question quiz with 80% (24 of 30) or better; you can retake the quiz as many times as you need until you pass.
Class 2 of 8 in the Level 3 series, Advanced Protective Relaying (PR-301 to PR-308). Recommended order: PR-301 through PR-309; classes may be taken in any order. Level 2 is recommended preparation.