job safety assessments or risk mitigation processes, including risk control measures three phase rectifier circuits, including: three phase circuit configurations resistive/inductive loads output voltages/waveforms ripple voltage/frequency peak reverse voltages freewheeling diodes measurement of rectifier output parameters three phase half wave-controlled rectifiers, including: phase control purpose/operation of half wave-controlled rectifiers circuit configuration rectifier performance and operation - resistive loads output voltage resistive load rectifier performance and operation - inductive loads rectifier output waveforms applications and limitations advantages and disadvantages three phase half wave-controlled rectifiers three phase half-controlled bridge rectifier, including: purpose/operation of a half-controlled bridge rectifiers circuit configuration and connections rectifier output - resistive loads output voltage resistive loads rectifier output - inductive loads output voltage - inductive loads flywheel diode output voltage calculations applications and limitations advantages and disadvantages three phase half-controlled bridge rectifiers three phase fully controlled bridge rectifier, including: purpose/operation of a fully controlled bridge rectifiers circuit configuration and connections rectifier output - resistive loads output voltage resistive loads rectifier output - inductive loads output voltage - inductive loads flywheel diode output voltage calculations applications and limitations advantages and disadvantages three phase fully controlled bridge rectifiers three phase alternating current (a.c.) controllers, including: circuit configurations circuit operation triacs and silicon controlled rectifier (SCR) circuits triggering requirements output voltage and waveforms determination of output voltage applications advantages and disadvantages direct current (d.c.) converters, including: purpose and operation of d.c. converters circuit configurations voltage control methods forced commutation methods calculation of load voltage output voltage/waveforms applications advantages and disadvantages cyclo-converters, including: purpose/operation of a cyclo-converter basic circuit configurations measurement of output voltage calculation of load voltage output voltage/waveforms applications and limitations advantages and disadvantages inverters, including: purpose/operation of an inverter basic circuit configurations measurement of inverter outputs output voltage applications and limitations advantages and disadvantages thyristor protection, including: power control devices failure protection techniques snubber networks series inductors amp trap high rupturing capacity (HRC) fuses gate pulse suppression installation of thyristor devices and circuits, including: need for heat sinking of power thyristor devices heat sink features and types installation methods for all types of thyristor packages basic thermal model, only to demonstrate the effect of different heat sink types and profiles and installation methods on thyristor junction temperature series and parallel thyristor connections, including: purpose of series/parallel connection series connections reasons operational problems parallel connections reasons operational problems fault finding three phase thyristor circuits, including: fault finding procedures typical faults power and trigger circuits characteristics displayed by common faults comparison of test data with expected data (voltage/current waveforms) location and replacement of faulty components problem-solving techniques relevant manufacturer specifications relevant tools, equipment and testing devices relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures sustainable energy principles and practices. |