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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Analyse circuits incorporating resistance, inductance and capacitive elements
   • Mathematical problems involving resistor inductor (RL) and resistor capacitor (RC) combinations in direct current (DC) circuits are solved
   • Mathematical problems involving resistive, inductive and capacitive reactance and overall circuit impedance in alternating current (AC) circuits are solved
   • Why large power factors are desirable in AC circuits is explained
   • Mathematical problems related to power factor correction mechanisms are solved
   • Conditions for resonance in series and parallel RLC circuit combinations are analysed
   • Mathematical problems involving resonance in series and parallel RLC circuit combinations are solved
   • Differing consequences of resonance to both RLC series and RLC parallel circuit are illustrated
2. Apply complex number theory to analyse AC circuit performance
   • J operator is explained
   • Rectangular notation of j operator is related to comparable trigonometric and polar notations
   • J operator is used in the addition and subtraction of phasors, applying the most appropriate notation to the solution of phasor problems involving current, voltage and impedance
   • Conductance, admittance and susceptance are distinguished from each other in terms of resistance, impedance and the j operator
   • Problems involving RL and C elements in different circuit combinations using j operator theory are solved
   • Power in AC circuit applications using j operator theory is calculated
3. Analyse operating principles of electrical instrumentation
   • Mathematical calculations are performed to demonstrate how moving coil and moving iron instruments may have their ranges changed
   • Mathematical calculations are performed to demonstrate how dynamometer type wattmeters may have their measuring ranges extended
   • Construction, operating principles and functions of electrical meters are outlined
   • Principal methods and instruments used in resistance measurement are detailed
   • Resistance measurements are conducted and verified using appropriate electrical instrumentation
4. Analyse operating principles of DC generators
   • EMF equation is applied to solve problems related to DC generators
   • Losses that may occur in DC generators are analysed
   • Appropriate parametric relationships for DC generator losses, together with expressions for output power and efficiency are derived and associated numerical problems are solved
   • Basic principles of DC armature winding techniques are explained
   • Generator armature reaction is explained
   • Expression for armature EMF is derived and applied to solve problems related to DC generators
   • Commutator arcing and how this might be minimised or eliminated is explained
   • Open circuit and load characteristic curves for separately excited, shunt, and compound wound DC generators are derived
5. Analyse operating principles of DC motors
   • DC torque equation is applied to solve problems related to DC motors
   • Losses that may occur in DC motors are analysed
   • Appropriate parametric relationships for DC motor losses, together with expressions for output power and efficiency are derived and associated numerical problems are solved
   • Speed equation for a DC motor is derived and corresponding characteristics for different winding configurations are sketched
   • Speed equation and characteristics of different DC motor configurations are applied to explain how DC motor speed may be controlled
   • Reasons for armature reaction and methods of compensating for its effects are identified
   • Why DC motors need variable starting resistors are explained
6. Compare operation of synchronous motors and generators
   • Marine applications of synchronous motors and generators are identified
   • Mathematical expression for the magnitude and rotational speed of the magnetic field produced by a three-phase supply is derived
   • Operating principle of synchronous motors is explained
   • Operation of synchronous motors and generators are compared and contrasted
   • Problems using phasor diagrams and mathematical expressions involving the effects of loads and excitation on synchronous motors are solved
   • Advantages and disadvantages of AC synchronous motors and generators are analysed
7. Analyse operation of single and three phase transformers
   • Basic transformation ratio and EMF equation for an ideal transformer is derived
   • No load and on load phasor diagrams for an ideal transformer are constructed, with negligible voltage drop through its windings
   • Causes of actual transformer losses are explained and relationships associated with the transformer equivalent circuit are derived
   • Open circuit and short circuit tests are applied to calculate transformer efficiency and voltage regulation
   • Problems related to the operation of auto-transformers are solved
8. Analyse requirements for parallel operation of AC and DC generators
   • Conditions required for shunt, series and compound wound DC generators to operate in parallel are identified
   • Numerical problems related to parallel operation of shunt, series and compound wound DC generators are solved
   • Conditions required for AC generators to operate in parallel are identified
   • Numerical problems related to parallel operation of AC generators are solved

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.
Electrical meters include one or more of the following:	energy meters frequency meters induction disc watt meters power factor meters
Problems include one or more of the following:	tapping point turns voltages

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying relevant work health and safety/occupational health and safety (WHS/OHS) requirements and work practices assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices identifying and applying relevant mathematical formulas and techniques to solve complex problems related to marine electrotechnology identifying and interpreting numerical and graphical information, and performing mathematical calculations to perform tasks such as using phasor diagrams and mathematical expressions to explain the effects of loads and excitation on synchronous motors identifying, collating and processing information required to perform complex calculations related to marine electrotechnology imparting knowledge and ideas through verbal, written and visual means reading and interpreting written information needed to perform complex electrical calculations solving problems using appropriate laws and principles using calculators to perform complex mathematical calculations.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

AC principles advanced principles of marine electrotechnology circuits: resistance inductance capacitance complex number theory DC generators DC motors difference between AC and DC electrical: circuits current power safety units of measurement electromagnetic: force induction electrical meters: energy meters frequency meters induction disc watt meters power factor meters Ohm’s Law operating principles of: DC generators DC motors electrical instrumentation parallel circuits parallel operation of AC and DC generators power factor power factor correction mechanisms resistance single and threephase transformers synchronous motors and generators WHS/OHS requirements and work practices.

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