Power Engineering 2

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.

At the end of the course the learner 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.

The exam is a 4 hour written exam.