ELEC5204PowerSystemAnalysis&Protection
Tutorial5
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
1st Semester 2014
Solutions for Tutorial 5 Switchgear & Fuses
Question 1
The temperature rise for a given current
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
1st Semester 2014
Tutorial 6
Instrument Transformers & Overcurrent Protection
_
Question 1
For the multi-ratio CT whose characteristics are shown in Fig.1 below, a
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
1st Semester 2013
Solutions for Tutorial 6
Switchgear & Fuses
_
Question 1
i) The required secondary current in this case is I=5A. For the burden of 0.5 the
second
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
7. Instrument Transformers
1
Instrument Transformers
Voltage (or potential) transformers, or VTs
Current transformers o
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
10. Differential Relays
1
Differential Relay Operating
Principle
I1
I2
PLANT TO BE
PROTECTED
I1 = I2 Healthy; no trip
| I1 - I2 | > Limit Fault
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
9. Directional relays and Distance
Protection
1
Directional Overcurrent Relays
A directional element (from voltage, from a
VT) is provided so
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
12. Overvoltage Protection;
System Earthing
1
Overvoltages
Caused by lightning and switching
Can cause insulation failu
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
11. Generator, Industrial &
Overvoltage Protection; System
Earthing
1
Generators and Motors
Large generators and motors
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
6. Fuses
1
FUSES
Simple, reliable, economic protection device. Oldest and
simplest device and least understood!
Combine
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
1st Semester 2014
Tutorial 5
Question 1
Switchgear & Fuses
A fuse element consists of a thin cylinder of material, of mass m, specific heat and
resistance R. It ha
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis and Protection
5. Switch-gears
1
Analysing Simple Circuits
Many circuits are simple enough to reduce
using series-parallel type reduc
University of Sydney
School of Electrical & Information Engineering
ELEC 5204 - Power Systems
Analysis & Protection
1. Introduction
1
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Experiment 3 - Distance, Bus and Transformer Protection
Objectives
The objectives of this laboratory exercise are:
Study distance protection for transmission line.
Summarize common bus faults,
Identify methods for bus protection,
Summarize common tran
UNIVERSITY OF SYDNEY SCHOOL OF ELECTRICAL ENGINEERING
ELEC 5204 POWER SYSTEM ANALYSIS AND PROTECTION
Mid-Semester Assignment Design of an Industrial Distribution Network
Introduction
This assignment is due Monday 23 May, 2017. All submissions on the black
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
Solutions for Tutorial 1 Questions
System Protection & Symmetrical Fault currents
_
Question 1
The impedance of generators, transformers and motors supplied by the
School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
Solutions for Tutorial 3 Solutions
Fault Calculations
_
Question 1
XT1
XL
XT2
XM
XG
Figure 1: Zero Sequence network of the given system
Question 2
XT1
XG1
XL1
XL2
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Information Engineering
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COMPLIANCE STATEMENT
LABORATORY WORK
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School of Electrical & Information Engineering
ELEC5204 POWER SYSTEMS ANALYSIS & PROTECTION
Solutions for Tutorial 2
Symmetrical components and Fault Calculations
_
Question 1
Per unit quantities are calculated as follows:
Per Unit Value =
Actual Value
Ba
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
3. Unbalanced Fault Analysis
1
Connecting up Sequence Networks
to Analyse Unbalanced Faults
The three sequence networks
University of Sydney
School of Electrical & Information Engineering
ELEC 5204 - Power Systems
2 Symmetrical components
1
Unbalanced Circuits:
Method of Symmetrical Components (Ch:8,9)
Mathematical transformation developed by C L
Fortescue. Converts any u
University of Sydney
School of Electrical & Information Engineering
Dr Keith Mitchell
ELEC 5204 - Power Systems
Analysis & Protection
8. Overcurrent Protection
1
Overcurrent Relays
Simplest type of relay driven by current only
First introduced to be compa
University of Sydney
School of Electrical & Information Engineering
ELEC 5204 - Power Systems
Analysis & Protection
1. Introduction
1
Disability Services
Website: sydney/edu/au/disability
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