Learn Transformer Protection Panel Schematics

What you'll learn
Transformer protection panel schematics
Introduction to title page, how page is divided in rows and columns
How to track inter panel loops
Drawing Revision No, Philosophy
Drawing approval stages
Why two ratings of transformer are mentioned on drawings
Understanding Drawing number
How Bay numbers are assigned
How to define address of object at the page
How to read list of content
Ordering code , Origin, Make of items
Details provided in GA drawings
Color coding, wire size, relay types, alarm, annunciation details, why GA drawing are important during design and commissioning stage / Maintenace stage
Generally, control wiring is grey, CT VT wiring RYB, trip ferrule in red color etc.
Understand symbols & legends
Symbol of CT, VT, Relays, Aux, push button, Load break switch, power contact of CB, limit switch etc
Relay and metering diagram
How relays are shown on R&M diagram, all protection schemes, core of CT's, tripping circuit, trip & lockout
CT and its cores
CT Polarity at primary and secondary sides
Protection and metering cores
Metering core circuit
Protection core circuit
Backup over current protection connections at R&M SLD
Transformer bay connection to Breaker failure and protection cores
HV & LV vector group, NGR connection, NGR over current, neutral over current at R&M SLD
Difference between neutral and NGR over current
Restricted earth fault protection CT connection & its zone at R&M SLD
Mechanical Protection from transformer at R&M SLD
Busbar & earth switch, Voltage transformer arrangement at R&M SLD.
Lock Relay 86
Tripping Relay 94
When to use 86 and where to use 94 relay in scheme.
List of Apparatus
AC Supply...

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