Download Switchgear & Protection

King Abdul Aziz University
College of Engineering
Electrical and Computer Department
EE 454
SWITCHG.& PROT. OF PWR. SYS.
Lectures Book
Dr. ABDULRAHMAN ALMASOUD
Function Of Industrial Switchgear
Foreword
Purpose And Types
Switchgear & Protection
Lecture 2
System and substation layout:
System layout:
I- radial feeder.
II- parallel feeder.
III- ring system.
Iv- combination of the past three kinds.
Substation layout
Substation layout:
Substations usually different in size, construction, cost and complexity
according to voltage, location and function.
The common feature they have is marshalling of all the associated
circuits, through CB, switches on to bus bar as shown Fig (1-2-2A).
(From Protection Relaying by Blackburn Page 338)
1-Single bus –single breaker
Fig (10.1)
2-Double bus – with bus tie single breaker
Fig (10.2)
3-Main & transfer bus – single breaker
Fig (10.3)
4-Double bus – single breaker
Fig (10.4)
5-Double bus – Double breaker
Fig (10.5)
6-Ring bus
Fig (10.6)
7-Breaker and a half bus
Fig (10.7)
8-Bus and transformer single breaker
Fig (10.8)
Function of Substation
Introduction:
Functions of Substation
Voltage Transformer – function 1
Circuit Switching – function 2
Voltage Regulation – function 3
VAR Control – function 4
System Protection – function 5
Design Considerations
Safety
Simplicity
Reliability
Maintenance
Flexibility
Radial Systems
Introduction
Simple Radial Systems
Expanded Radial Systems
Single-Ended Unit Substations
Radial Systems
Simple And Expanded Radial Systems
Radial Systems
Single-Ended Unit Substations
Loop Systems
Primary Loop Systems
Secondary Loop Systems
Loop Systems
Primary Loop Systems
Selective Systems :-
Primary selective system
Secondary Selective System :-