8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and applying Occupational Health and Safety practices in the workplace. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-TIS33A Remote area network systems Evidence shall show an understanding of remote area network systems to an extent indicated by the following aspects: T1 Alternating Current Quantities encompassing: sine, cosine and tangent ratios of a right angle triangle Pythagoras Theorem to a right angle triangle. use of the CRO to measure d.c. and a.c. voltage levels sinusoidal voltage generated by a single turn coil rotated in a uniform magnetic fields terms 'period', 'maximum value', 'peak-to-peak value', 'instantaneous value', 'average value', 'root-mean-square (r.m.s.) value', in relation to a sinusoidal waveform. calculation of the instantaneous value of induced voltage of a generated sinusoidal waveform. measurement of instantaneous, peak, peak-to-peak values and the period of a sinusoidal waveform. calculation of root-mean-square (r.m.s.) value and frequency of a sinusoidal waveform from values of peak voltage and period. T2 Phasors Diagrams encompassing: purpose of phasor diagrams 'in-phase', 'out-of-phase', 'phase angle'' lead' and 'lag'. phase angle between two or more alternating quantities from a given sinusoidal waveform diagram. convention for representing voltage, current and the reference quantity in a phasor diagram. drawing phasor diagrams to show the relationship between two or more a.c. values of voltage and/or current. determination of phase relationship between two or more sinusoidal waveforms from a given diagram and measurements.. T3 Single Element a.c. circuits encompassing: setting up and connect a single-source resistive a.c. circuit and take voltage and current measurements to determine the resistance determining the voltage, current resistances from measure of given values of any tow of these qualities. relationship between voltage drops and current in resistive a.c. circuit applications of resistive a.c. circuits defining ‘inductive reactance’. calculation of inductive reactance for a given inductor and the relationship between inductive reactance and frequency. applying Ohm’s Law to determine voltage, current of inductive reactance in a purely inductive a.c. circuit given any two to these quantities. applications of inductive a.c circuits. calculation of capacitive reactance applying Ohm’s Law to determine voltage, current or capacitive reactance in a purely capacitive a.c circuit given any two of the quantities. applications of capacitive a.c circuits T4 Impedance a.c. circuits encompassing: impedance’ and impedance triangle. determining the impedance, current and voltages for a series a.c circuit. drawing and labelling the impedance triangle for a series RC circuit examples of capacitive components in power circuits and systems and the effect on the phase relationship between voltage and current. drawing the equivalent circuit of a practical inductor examples of inductive components in power circuits and systems and describe their effect on the phase relationship between voltage and current T5 Power in an a.c. circuit encompassing: difference between true power, apparent power and reactive power and the units in which these quantities are measured. drawing the power triangle to show the relationships between true power, apparent power and reactive power defining the term "power factor" and phase angle. methods used to measure single phase power, energy and demand. T6 Power Factor Improvement encompassing: effects of low power factor. requirements for power factor improvement. methods used to improve low power factor of a installation. local supply authority and AS/NZS 3000 wiring rules requirements regarding the power factor of an installation and power factor improvement equipment. T7 Harmonics Effect in a.c. Systems encompassing: term "harmonic" in relation to the sinusoidal waveform of an a.c. power system. sources in a.c. systems that produce harmonics. problems that may arise in a.c. circuits as a result of harmonics and how these are overcome. methods and test equipment used to test for harmonics methods used to reduce harmonics in a.c. power system T8 Three Phase Systems encompassing: features of a multiphase system. comparison of voltages generated by single and multiphase alternators. reasons for the adoption of three phases for power systems. how three phases is generated in a single alternator. Calculation of r.m.s. value of voltage generated in each phase given the maximum value. relationship between the phase voltages generated in a three phase alternator and the conventions for identifying each. term "phase sequence" (also, referred to as "phase rotation"). determining the phase sequence of a three phase supply T9 Three phase star-connections encompassing: connecting a three phase star-connection load. phase relationship between line and phase voltages and line and phase currents of a star-connected system. determining the r.m.s. value of line and phase voltage given any one of these quantities. determining the r.m.s. value of line and phase current given any one of these quantities. terms "balanced load" and "unbalanced load". example of balanced and unbalanced loads in typical power systems. T10 Three phase four wire systems encompassing: purpose of the neutral conductor in a three phase four wire systems. determining the effects of an high impedance in the neutral conductor of a three phase four wire system supplying an unbalanced load where MEN earthing is employed. T11 Three phase delta-connections and Interconnected systems encompassing: connecting three phase delta loads. phase relationship between line and phase voltages and line and phase currents of a delta-connected system. determining the r.m.s. value of line and phase voltage given any one of these quantities. determining the r.m.s. value of line and phase current given any one of these quantities. limitations and uses of open delta connections example of loads in typical power systems. drawing the typical combinations of three phase interconnected systems using star-connections and a delta-connection. relationship between line and phase voltages and line and phase currents in the typical interconnected systems using star-connections and delta-connections. T12 Fault Loop Impedance encompassing: term fault loop impedance of a a.c. power system measuring fault loop impedance of typical circuits procedures for testing fault loop impedance |