3rd Period Electrical SAIT

Describe induction and mutual induction in a single-phase transformer. Describe the construction and features of a single-phase transformer. Calculate the ratings, ratios, and associated values of a single-phase transformer. Describe transformer polarities. State how transformer voltage taps are used. Connect and analyze a multiple winding transformer.

Describe transformer action and calculate percent voltage regulation. Calculate transformer losses. Calculate the efficiency and the available short-circuit current of a transformer. Describe the requirements for paralleling single-phase transformers and associated hazards. Connect and analyze a load test on a transformer. Perform an open-circuit test on a transformer. Perform a short-circuit test on a transformer. Connect and analyze single-phase transformers in parallel.

Describe the operation of autotransformers. Perform calculations for an autotransformer. List the advantages and disadvantages of autotransformers. Connect and analyze the operation of an autotransformer.

Describe the characteristics of a wye/wye transformer connection. Describe the characteristics of a delta/delta transformer connection. Describe the characteristics of a wye/delta transformer connection. Describe the characteristics of a delta/wye transformer connection. Describe the characteristics of an open delta/open delta transformer connection. Describe the characteristics of a neutral ground resistor. Connect and analyze three-phase transformers connections. Connect and analyze an open co

Define terms used to describe dc machines. Describe the operation and principles of dc machines. Describe the applications and benefits of dc machines. Connect and analyze dc machines.

Identify terms related to a three-phase induction motor. Describe the construction of a three-phase induction motor. Describe the principle of operation of a squirrel-cage induction motor. Describe information located on a motor nameplate.

Analyze the effect of load on stator current, rotor parameters, and percent slip. Calculate synchronous speed and percent slip of a three-phase induction motor. Analyze rotor parameters and their effect on torque. Determine motor efficiency. Identify electrical and mechanical characteristics of NEMA rotor designs. Describe the wound-rotor motor and its electrical and mechanical characteristics.

Describe the high and low voltage connections of three-phase multi-lead motors. Describe the operation of across-the-line three-phase motor starters. Describe the operation of wye/delta three-phase motor starters. Describe the operation of autotransformer three-phase motor starters. Identify conditions that could cause the single-phasing of a three-phase motor. Describe the operation of a wound-rotor motor. Troubleshoot a three-phase motor starter. Connect and identify the leads on a nine-lead m

Describe the characteristics of rotary and static phase-converters. Describe the applications of variable frequency drives. Describe the operation of variable frequency drives. Describe the considerations for the installation of variable frequency drives. Connect and analyze the operation of a variable frequency drive for various loads. Troubleshoot a three-phase motor and variable frequency drive.

Define terms used to describe ac machines. Describe the operation and principles of alternators and generators. Describe the operation of a voltage regulator. Describe how to synchronize and parallel alternators. Connect and analyze three-phase alternators. Connect and analyze the operation of an automatic voltage regulator. Connect and analyze parallel operation of three-phase alternators.

Describe the applications of synchronous motors. Compare a synchronous motor to a squirrel-cage induction motor. Describe the operation and principles of a synchronous motor. Describe the relationship between excitation and load. Connect and analyze a synchronous motor.

Explain the difference between single-phase power and three-phase power. Explain the generation of the phase voltages of a three-phase system. Explain the phase sequence of three-phase sine waves. State three main advantages of three-phase power over single-phase power.

State the relationship between phase voltage and line voltage for a wye system. State the relationship between phase current and line current for a wye system. Explain the importance of a neutral conductor in an unbalanced wye system. Draw a complete phasor diagram of a balanced wye-connected circuit. Draw a phasor diagram of a wye circuit with an unbalanced load. Recognize and apply formulas being used in electrical theory calculations. Perform calculations for a wye-connected circuit. Connect

Describe the connection of self-contained meter sockets. Describe the connection and use of instrument transformers. Describe the connection of voltmeter and ammeter transfer switches. Connect and analyze instrument transformers for energy measurement.