Learn Transformer Protection Panel Schematics

Electrical Power System Protection, Wiring Diagram, Drawing

What you will 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 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.

Description

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.

Get Instant Notification of New Courses on our Telegram channel.

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.