CT Testing for Commissioning (Ratio, Polarity, Excitation / Saturation)

🔗 The Energization Log: https://theenergizationlog.com 🛒 Shop: https://theenergizationlog.com/shop 📚 Free resources: https://theenergizationlog.com/resources C-T testing for commissioning is ratio, polarity, and excitation / saturation behavior — with shorting discipline — not a casual winding check and walk away. CT testing explained: what commissioning needs; ratio vs nameplate / factory; polarity mark sense; excitation / saturation concepts (no invented universal knee-point); burden and shorting discipline; open-secondary hazard; fail path and restore. Not a substitute for the CT OEM, owner spec, or IEEE / IEC / NETA lines on your package. Not a defeat-protection tutorial. Training diagrams only — training CT, training relay, Training ITP, test sheet. No fabricated IDs. No invented universal knee-points or ratio tolerances. Chapters 00:00 CT testing without the casual walk-away 00:35 Training disclaimer 00:47 What CT testing is on a commissioning pad 02:13 Ratio 03:25 Polarity 04:27 Excitation / saturation concepts 05:48 Burden, shorting, open-secondary hazard 07:08 Fail path, restore, honest scope 08:02 Subscribe Governing references: Owner specification / Training ITP acceptance lines CT OEM manuals and nameplate data IEEE / IEC / NETA as cited on your package (we do not paste limits) Site isolation / LOTO / CT shorting procedures Subscribe. Comment primary injection for ratio, secondary methods, or both (no site names). Disclaimer This video is training and information only. It is not a work instruction, not a site procedure, and not a substitute for the manufacturer’s manual, the owner’s specification, or a qualified person’s assessment. Do not perform CT testing unless you are competent, authorized, and working under the applicable isolation, LOTO, and permit-to-work system. An open CT secondary with primary current available can be hazardous. Never leave protection circuits in a state that blinds an in-service scheme. Never demonstrate defeating protection. Ratings, connections, and acceptance criteria vary. If this video and your governing document disagree, the governing document wins. Not filmed at a client site. Views are the channel’s, not any employer or client. The Energization Log — From isolation to energization. @TheEnergizationLog