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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

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king abdul aziz university college of engineering electrical and computer department

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
Function Of Industrial Switchgear

Foreword

Purpose And Types

switchgear protection
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

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)

functions of substation
Functions of Substation

Voltage Transformer – function 1

Circuit Switching – function 2

Voltage Regulation – function 3

VAR Control – function 4

System Protection – function5

design considerations
Design Considerations

Safety

Simplicity

Reliability

Maintenance

Flexibility

radial systems
Radial Systems

Introduction

Simple Radial Systems

Expanded Radial Systems

Single-Ended Unit Substations

loop systems
Loop Systems

Primary Loop Systems

Secondary Loop Systems

selective systems
Selective Systems :-

Primary selective system