General course objectives
Introduction to symmetrical components provides a basis for
analysing various types of faults (both symmetrical and
unsymmetrical) that may occur in the electrical network.
Introduction to transient stability in the electrical network due
to faults on the power system is discussed.
Introduction to basic knowledge and skills regarding methods of
protection of power systems. The student must be able to,
independently, acquire knowledge of safety issues associated with
the operation of the electrical power system.
Learning objectives
A student who has met the objectives of the course will be able to:
- Calculate the symmetrical fault currents in a power system from
the single phase equivalent Thévenin circuit
- Calculate the symmetrical fault currents and bus voltages in a
power system by making use of the bus impedance matrix
- Understand the principle of sequence components
- Construct an equivalent zero-, positive- and negative- sequence
network for a power system
- Calculate the unsymmetrical fault currents, during a single
line to ground, line to line, and line to line to ground fault,
from the equivalent Thévenin circuit of the zero-, positive- and
negative- sequence network for a power system
- Calculate the unsymmetrical fault currents, as well as bus
voltages during a single line to ground, line to line, and line to
line to ground fault, from the zero-, positive- and negative-
sequence bus impedance matrices of a power system
- Understand the principle of transient stability during faults
on the power system and be able to calculate the critical fault
clearing time for the system to remain stable
- Understand the possibilities and limitations of different
principles of protection
- Be able to pick a suitable principle of protection
- Have an understanding of how relays and other protection
devices work
- Have an understanding of how relays and other protection
equipment are set up and tested
- Understand principles for determination of fault type
Content
- Symmetrical fault
- Sequence components
- Sequence networks
- Unsymmetrical faults
- RelaySimTest
- Transient stability
- General protection philosophy
- Input devices to relay, e.g. CTs and VTs
- Grounding of power systems
- Over current protection using definite time and inverse definite
time settings
- Overcurrent protection using time and inverse time settings
- Zone protection and Backup protection
- Distance protection, Pilot protection, Bus protection,
Transformer protection
Course literature
Notes and the book from
- Glover, Overbye and Sarma, "Power systems analysis &
design", sixth edition
- Blackburn & Domin, "Protective Relaying: Principles and
Applications", fourth edition"
Remarks
Section of Electric Energy
Elektrisk Energiteknologi: 4. semester
Last updated
02. maj, 2024