Dashboard › NCEES PE Power — Oct 2025 Blueprint › 1. Measurement and Instrumentation › A. Instrument transformers and metering

A. Instrument transformers and metering

CT/PT saturation, knee-point voltage, accuracy classes, burden.

Lessons

Lesson 1

CT / VT (PT) characteristics and saturation

ANSI C-class CTs (C400, C800), accuracy classes, burden, saturation effects on differential / distance / overcurrent protection. Inductive VT vs CCVT. Ferroresonance on ungrounded systems. Modern relay tolerance.

Senior ~12 min