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Electrical Engineering - ELEN 355

The Elements of Power Systems Analysis

• Use double subscript notation for power systems analysis.
• Calculate average power and instantaneous power.
• Understand the advantages of working problems in the frequency domain.
• Describe the convention for reactive power being positive.
• Describe the convention for active power being supplied.
• Calculate load power factor and supply power factor.
• Discuss the major advantages of using 3 phase ac electricity.
• Identify the conditions for a balanced, symmetrical power system.
• Describe the phase sequence options for a 3 phase system.
• Apply the National Electrical Code and the National Electrical Safety Code
• Show voltage & current how relate to turns ratio (ideal transformer).
• Describe how secondary side impedances are referred to the primary side.
• Discuss the model for a transformer with all practical considerations included.
• Calculate the active and reactive power losses for a transformer.
• Calculate transformer efficiency.
• Discuss why an autotransformer has an increased power rating.
• Determine transformer impedances from test results.
• Calculate the turns ratio for the three phase connections.
• Calculate the power rating for a three phase transformer.
• Calculate he phase shift for three phase connections.
• Identify the advantages of using per unit calculations.
• Convert a one line diagram to a diagram on a consistent base.
• Calculate the fault current for faults at different points in a system.
• Discuss how internal voltage is related to the field current in a generator.
• Calculate active & reactive power given power angles.
• Discuss over-excited, under-excited, and normally excited operation.
• Describe ways to increase power output when a generator serves a load.
• Calculate generator output when connected to an “infinite bus.”
• Describe the 3 fault currents of concern when a generator is shorted.
• Calculate transmission line resistance given resistivity data.
• Calculate transmission line resistance for temperature changes.
• Discuss the advantages of various line configurations.
• Calculate transmission line capacitive reactance.
• Discuss double circuit construction and how impedance is determined.
• Use the Westinghouse (ABB) tables to find line impedance.
• Model the “short line.”
• Model the “medium length line.”
• Model the “long line.”
• Calculate the ABCD generalized constants for various line models.
• Discuss the characteristic impedance and surge impedance for a transmission line.
• Calculate the “charging current” for a single phase and a three phase line.
• Understand the symmetrical components method.
• Discuss the assumptions for conducting stability studies.
• Describe the structure of the U.S. power grid.