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Evidence Guide: UEEEL0062 - Provide engineering solutions to problems in complex polyphase power circuits

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

UEEEL0062 - Provide engineering solutions to problems in complex polyphase power circuits

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare to develop engineering solutions in complex polyphase power circuit problems

  1. Work health and safety (WHS)/occupational health and safety (OHS) processes and workplace procedures for a given work area are identified, obtained and applied
Work health and safety (WHS)/occupational health and safety (OHS) processes and workplace procedures for a given work area are identified, obtained and applied

Completed
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WHS/OHS risk control work preparation measures and workplace procedures are followed

Completed
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Scope of complex polyphase power circuit problems is identified from documentation and/or work instructions

Completed
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Advice is sought from the work supervisor to ensure the work is coordinated effectively with others

Completed
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Sources of materials required for work are identified in accordance with workplace procedures

Completed
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Tools, equipment and testing devices required for work are obtained and checked for correct operation and safety

Completed
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Provide engineering solutions to problems

  1. WHS/OHS risk control work measures and procedures are followed
WHS/OHS risk control work measures and procedures are followed

Completed
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The need to test and measure live electrical work is determined in accordance with WHS/OHS requirements and workplace procedures

Completed
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Circuits are checked and isolated in accordance with WHS/OHS requirements and workplace procedures

Completed
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Complex polyphase power circuit problems are solved from interpreting measurements and calculated values in accordance with workplace procedures

Completed
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Unplanned situations are dealt with safely and with the approval of relevant person/s

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Problems are solved without damage to apparatus, circuits, the environment and/or services using sustainable energy practices

Completed
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Complete work and document solutions

  1. WHS/OHS work completion risk control measures and workplace procedures are followed
WHS/OHS work completion risk control measures and workplace procedures are followed

Completed
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Worksite is cleaned and made safe in accordance with workplace procedures

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Justification for solutions used to solve complex polyphase power circuit problems is documented

Completed
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Work completion is documented and relevant person/s notified in accordance with workplace procedures

Completed
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Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

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:

determining the operating parameters of existing circuit

using established problem-solving methods

taking relevant measurements accurately

interpreting measured values appropriately

providing effective solutions to circuit problems from measurements and calculations

giving written justification of solutions provided

dealing with unplanned events

applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including using risk control measures

checking and isolating circuits

documenting completed work and notifying relevant person/s

identifying sources of materials required for work

identifying the scope of the complex polyphase power circuit problems

preparing for problems in complex polyphase power circuits

testing and measuring live work

using tools, equipment and testing equipment.

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:

polyphase power circuit analysis, including:

polyphase supply system encompassing:

advantage of three phase system compared to single phase systems

double subscript notation

phase sequence

120 degree operator

given circuit component parameters, solve practically-based problems using:

equivalent circuits of transformers, lines and loads

component values using rectangular and polar notation

current divider and potential divider rules using complex impedances

the "per unit" values of voltage, current and impedance to a common VA base

types of three phase system connections encompassing:

supply to balanced star, three and four wire loads

supply to delta connected loads

effects of phase reversal

representation of currents and voltages as complex phasors for three phase, and three phase and neutral quantities

calculation of the values of, and drawing labelled phasor diagrams, not to scale, to represent complex values of current and voltage for balanced and unbalanced loads for star and delta systems

calculation of values of P, Q and S for balanced and unbalanced systems

draw and label single phase diagrams to represent one phase of a complex three phase system

represent unbalanced voltages or currents as symmetrical components

phase-to-phase currents

phase-to-neutral/earth currents

balanced three phase loads encompassing:

calculations of balanced loads connected in star

calculations of balanced loads connected in delta

calculation of steady state values of fault current for various configurations

evaluation of the symmetrical component impedances for the various distribution system components, transformers (earthed neutral case) and generators (high impedance earth)

calculation of fault currents using the per unit approach

calculation using the "worst case" values based on transformer impedance only (i.e. a short circuit fault)

estimation of peak values using accepted multipliers

effects of the direct current (d.c.) component on the instantaneous magnitudes of fault currents in transformers and generators

unbalanced three phase loads encompassing:

star – four wire systems

delta systems

star – three wire systems

star - four wire with neutral impedance

power in three phase circuits encompassing:

summation of phase powers and power in balanced loads

measurement of power in balanced loads – two Wattmeter methods

reactive three phase power encompassing:

power triangle calculation

measurement of VAR

power factor correction

fault currents encompassing:

symmetrical components

positive, negative and zero sequence impedance

fault current breaking and let-through energy capacities of circuit breakers and fuses

importance of fault/arc impedance

calculation of fault currents - phase-to-earth faults

calculation of fault currents - phase-to-phase faults

analysis of asymmetrical fault currents

harmonics in three phase systems encompassing:

presence of triple in harmonics in three phase systems

effects of three phase harmonics for different star and delta connections

methods for reducing harmonics in three phase systems

problem-solving techniques

relevant checks and isolation of circuits

relevant manufacturer specifications and operating instructions

relevant materials, tools, equipment and testing devices

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

relevant workplace instructions, policies and procedures.

Range Statement

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

Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.