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Elements and Performance Criteria

1. Explain how material properties affect resistance of electrical conductors
   • Terms and symbols used in the formula for resistivity are used correctly
2. How resistance varies with changes in conductor length and cross-sectional area is outlined
3. How resistance varies with temperature is outlined
4. Calculations are performed that illustrate how material properties affect resistance of electrical conductors
5. Apply Ohm’s Law to electrical circuits
   • Main sources of electromagnetic field (EMF) are identified
6. Terms and symbols used in Ohm’s Law are used correctly
7. Calculations are performed using Ohm’s Law to solve problems involving internal, external and variable resistances in both series and parallel circuits
8. Calculations are performed to determine power required and/or energy expended by electrical devices
9. Circuits for a Wheatstone bridge and a slide wire bridge are sketched and their application on a ship is outlined
10. Calculations are performed dealing with resistances, currents and voltage drops in bridge circuits under null or balanced conditions
11. Apply principles of electrolytic action to electrical cells
    • How the theory of electrolytic disassociation when applied to common electrolytic solutions and electrode materials explains the generation of EMF from chemical sources, is outlined
12. Primary cells are distinguished from secondary cells
13. Calculations are performed to solve problems involving currents, voltage drops and terminal potential difference of cells connected to form batteries in series and in parallel
14. How capacity of a battery is measured is explained
15. Construction of typical batteries used in marine environments is outlined
16. Apply principles of electromagnetism to EMF generation
    • Form and properties of the magnetic fields surrounding single conductor and multi-turn solenoid coils when carrying an electrical current are compared and contrasted
17. Terms and symbols used in Faraday’s and Lenz’s laws of electromagnetic induction are used correctly
18. Calculations are performed using Faraday’s and Lenz’s laws of electromagnetic induction to solve problems related to electromagnetism and EMF generation
19. Fleming’s Right Hand Rule is outlined
20. Explain operation of direct current (DC) rotating machinery
    • Construction and methods of maintaining and repairing typical DC machines are illustrated
21. Principle wiring arrangements used with DC machines are outlined
22. Action of the commutator in DC generators is outlined
23. Significance of Back EMF (Eb) in the operation of DC motors is outlined
24. Mathematical formulae are applied to show relationships between operational parameters of DC motors
25. Calculations are performed to solve simple problems relating to power output and efficiency in DC. motors
26. Explain operation of alternating current (AC) rotating machinery
    • How three phase AC may be developed out of simple single phase AC is explained
27. Difference between Star and Delta connections is outlined
28. How a three phase supply can generate a rotating magnetic field is explained
29. Construction of an AC synchronous generator is outlined
30. Construction of an AC induction motor is outlined
31. Calculations are performed to show how driving torque is produced in an induction motor
32. Explain parallel operation and load sharing of generator
    • Load/voltage curves of AC and DC generators are compared
33. Main requirements for satisfactory power sharing between both AC and DC generators are outlined
34. Sequences that occur when load changes on two DC generators working in parallel without an equaliser connection are outlined
35. Effect of varying power factors on the load/voltage curve of an AC generator is outlined
36. Explain coupling and breaking connections between switchboard and distribution panels
    • Construction, equipment and service of main switchboard and emergency switchboard and distribution panel are outlined
37. Construction and operation principle of measuring instruments in main and emergency switchboards and distribution panels are outlined
38. Construction and operation principle of circuit breakers and their tripping devices are outlined
39. Procedures for restarting ship equipment after power supply failure are outlined
40. Connection between main and emergency switchboards and necessary safeguards are outlined
41. Procedures for changeover to shore-connection supply are outlined

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.

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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 and performance criteria on at least one occasion and include: 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 basic problems related to marine electrotechnology identifying and interpreting numerical and graphical information, and performing mathematical calculations, such as resistance of electrical conductors, power output and efficiency in direct current (DC) motors, and driving torque in induction motors identifying, collating and processing information required to perform basic calculations related to marine electrotechnology performing accurate and reliable calculations reading and interpreting written information needed to perform basic electrical calculations solving problems using appropriate laws and principles.

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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 and performance criteria and include knowledge of: basic principles of marine electrotechnology batteries cables circuit breakers coupling, load sharing and changing over generators, including: conditions for automatic start of emergency generator and starting methods control systems for distribution for active and reactive power excitation systems of generators methods of synchronisation power factor principles of power management, including: control of start-release of big consumers directly supplied from main switchboard automatic three-step disconnection of non-essential power consumers load depending start and stop of generator and automatic load sharing protections for generators and diesel engines, including: asymmetrical voltage and current frequency and voltage stabilisation of shaft generators open circuit, wire fault and earth-fault monitoring overload reverse power short circuit under and overvoltage under and over frequency safety systems of generators voltage and frequency control systems DC motors and rotating machinery difference between alternating current (AC) and DC distribution panels electrical: current power safety units of measurement electromagnetic: force induction effective verbal, written and visual communication techniques electrical theory, including: electrical circuits impedance and inductance Kirchhoff's Law Ohm’s Law electrical motors including: AC motor DC motor electrical motor starting methodologies emergency switchboard fundamentals of AC, including: principles rotating machinery high voltage (HV) lighting main switchboard measuring instruments for switchboards operational parameters of DC motors, including: current flux density torque voltage parallel circuits power distribution systems, including: distribution insulation transformers principles of electromagnetism and electrolytic action resistance series circuits shore connection work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices.

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