Power systems and machines

Examiner: Associate Professor Hanif Livani, hlivani@unr.edu

Text:

• Power System Analysis and Design, Glover and Sarma, Third Edition, Brooks/Cole, 2002

Objectives:

• Solve problems involving phase angles, line-line or line-neutral voltages and line or phase currents for a three-phase power system
• Obtain single-phase and three-phase real and reactive power and the power factor
• Solve power factor correction problems
• Model power system transmission lines
• Model single phase and three-phase transformers
• Model synchronous machines

Exam topics:

• Fundamental
  • Phasors
  • Instantaneous power in single-phase AC circuits
  • Complex power
  • Network equations
  • Balanced three-phase circuits
  • Power in balanced three-phase circuits
  • Advantages of balanced three-phase versus single-phase systems
• Power transformers
  • The ideal transformer
  • Equivalent circuits for practical transformers
  • The per-unit system
  • Three-phase transformer connections and phase shift
  • Per-unit model of three-phase two-winding transformers
  • Three-winding transformers
  • Autotransformers
• Fundamentals of electrical machines
  • DC, synchronous, and AC machines
• Transmission lines parameters
  • Transmission-line design considerations
  • Resistance
  • Conductance
  • Inductance (solid cylindrical conductor)
  • Inductance (single-phase two-wire line and three-phase three wire line with equal phase spacing)
  • Inductance (composite conductors, unequal phase spacing, bundled conductors)
  • Series impedances (three-phase line with neutral conductors and earth return)
  • Capacitance (single-phase, two-wire line and three-phase, three-wire line with equal phase spacing)
  • Capacitance (stranded conductors, unequal phase spacing, bundled conductors)
  • Parallel circuit three-phase lines
• Transmission lines
  • Steady-state operation: Medium and short line approximations
  • Transmission-line differential equations
  • Equivalent π circuit
  • Maximum power flow
  • Line loadability
  • Reactive compensation techniques
• Power flow analysis
  • The power-flow problem