Power Engineering 2

• 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

– Symmetrical fault
– Sequence components
– Sequence networks
– Unsymmetrical faults
– PSCAD
– 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
– Overstrøms beskyttelse ved hjælp af tid og invers tidsindstillinger
– Zone protection and Backup protection
– Distance protection, Pilot protection, Bus protection, Transformer protection

Lectures, assignments and problem solving

Faggruppe: Elektrisk Energi
Elektrisk Energiteknologi: 4. semester