Electrical Circuits Engineering Teaching & Academics Udemy

Learn Transformer Protection Panel Schematics

November 17, 2022 36 0

Learn Transformer Protection Panel Schematics, Electrical Power System Protection, Wiring Diagram, Drawing.

Dear All,

Welcome to the course of understanding schematics of “Transformer Protection Panel Schematics”. This course covers complete schematics of 20/26MVA 132/11 kV transformer protection panel.

Trainer have over 18 years of field experience and has worked at 11/132/220/500kV Substation, 1263MW power plant, 660kV HVDC system. worked with several companies, SIEMENS, ABB, GE, SEC, KE, WAPDA, NTDC, ARAMCO, SABIC, MARAFIQ. Trainer has given hundreds of trainings online and offline, so it will be great to join this training and take advantage of field experience.

This training is designed over as schematics, that will also be available to download.

Topics covered in this training are as follows,

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 circuit, AC Socket, AC light, AC lighting and heating, annunciation
External and internal panel drawings symbols
MCB connections, where to connect ODD & EVEN terminals
What mean by arrow signs & square shows for MCB symbol
AC Loop failure indication
AC annunciator circuit
DC Supply Circuit
DC supply change over circuit
Redundancy of DC supply explained & why it is provided
What mean of dash dot lines in drawings
How dc supply change over circuit works if one supply fail.
What is loop in drawings and naming of loop
Understand DC supply supervision & loop supervision, what is difference between them
Tracking loop across drawings and check till end
Explained Current Transformer circuit of Differential protection & over current protection
Zone of differential protection
Shorting facility of CT circuit
Why CT circuit should be short circuited all the time & must never be open circuited
Explained Test Block, Use of test block
How to inject current through tester
CT connection of REF protection
Zone of REF Protection
Why lockout contacts are used in parallel to high impedance lockout relay
Over voltage protection in REF protection
Relay power supply connection
Relay watch dog contact
Test block contact 13-14 for relay powering up.
test plug cover when removed relay is powered off.
Difference between tripping and lockout relays
How to reset lockout relays, mechanical & electrical reset
Binary input circuit of relays
Operation of lockout relays
Circuit of Tripping and lockout relays
Complete details of contacts of lockout relays
Trip Coil 1 & 2 circuit
Breaker Failure initiation
Trip circuit supervision relay
Supervision relay working when circuit breaker is in open / close position
Close Block feature, why its is required, circuit of close block
Alarm and SCADA circuit
Device detail & panel layout.