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Elements and Performance Criteria

  1. Prepare to rewind three phase induction machines.
  2. Rewind three phase induction machines.
  3. Complete work report.
  4. Note 1:
  5. Particular attention shall be given to following risk control measures related to high voltage hazards.

Required Skills

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 rewinding three phase induction machines rated for high voltage above kV

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEGA High voltage three phase motor winding techniques rated above kV

Evidence shall show knowledge and skills of high voltage three phase motor winding techniques rated above kV to an extent indicated by the following aspects

T HV winding conductors and their applications

T HV winding wire connection methods encompassing

Conductor handling

Conductor preparation

Connection mediums

T Insulation types and methods

T Critical details and measurements when stripping a stator encompassing

Winding types

Note

Example are hairpin wound stator and lap wound stator

Winding diagram

Wedges of a radially ventilated machine

Factors to be considered when selecting cables for a stator

T Procedures for checking the condition of a stripped in preparation for rewind encompassing

Manufacturers specifications

Sequence of events between the removal of the old winding and the start of rewinding

Core loss test the effect this test may have on the core and expected test results

Methods of overcoming hot spots in a stator core

Level of insulation required to insulate the steel bracing rings that support the overhang

Difference between the slot liners and packers of a kV machine

T Procedures for the fitting of coils to core wedging and bracing

Significance of the slot portion of coils for machines above kV

Method of inserting the coils of a ribbon winding into slots

Effects of undue mechanical stress on B stage insulated coils

Importance of coil pitch and why it is important

Sequence of events in fitting the first pole pitch group of coils in a lap winding

Sequence of events in fitting the coils of a concentric winding

Purpose and location of the excess packing in a slot

Difference between the wedges for a lap and hairpin winding

Method of fitting a wedge

Difference that may be encountered between the wedges for a radial ventilated and the wedges for an axially ventilated machine

Methods used to brace and strengthen the overhang of a lap winding and a hairpin winding

T Procedures for making inter turn and inter coil connections on a hairpin winding and inter coil connections on a lap and bar winding encompassing

Sequence of events in making turn to turn connections and insulating the turns of a lap winding

Note

Connection methods include silver solder or brazing and soft solder

Sequence of events from hand forming the coil to final insulation in making the turn to turn connections in a hairpin winding using a welded joint

Sequence of events in making the coil to coil connections in a bar winding

T Testing according to British and IEC standards

Note

Examples of testing are kV B stage insulated winding and VPI winding test

T Materials procedures tests and precautions required during and after the impregnation of completed windings according to Australian British and IEC standards

Precautions to be taken when handling and using varnishes and resins

Important features of an oven used to cure large impregnated machines

Application and features of various impregnating materials

Note

Examples are water based varnish Xylol base varnish and solids resin

Method of carrying out a gel test on a resin and a viscosity test on a varnish

Typical quality procedures carried out on an impregnating varnish

Procedure and precautions for carrying out the a hot dip impregnation a flood coat impregnation and a VPI impregnation

Tests to be carried out after impregnation and bake on a a kV B stage insulated winding and a VPI winding

T Winding to terminal connections according to British and IEC standards

Criteria for selection of winding to terminal cables

Note

Examples are voltage rating full load current and fault capacity

Common types of terminal boxes and their structure

Note

Example are phase segregated phase separated and phase insulated

Method of making the joint between winding and terminal cables and insulating such a joint

T Procedures and precautions to be followed when performing static electrical testing of a completed rewind according to Australian British and IEC standards encompassing

Types and purpose of tests

Testing safety precautions

Testing procedures

Note

Examples of tests are repetitive surge test loss tangent test polarisation index PI test cold resistance test and polarity test

Interpretation of test results

Calculation of winding cold resistance and line and phase resistance

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the Industrys preferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment It is recognised that in some circumstances assessment in part or full can occur outside the workplace However it must be in accordance with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal every day work have a bearing on the decision as to how much and how detailed the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites shall be met

Evidence for competence in this unit shall be considered holistically Each element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall also comprise

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Rewind three phase induction machines rated for high voltage above kV as described as described in and including

A Dismantling machine and storing parts securely

B Preparing stator for winding

C Following winding specifications

D Selecting correct coils and insulation

E Winding and connecting stator correctly

F Assembling machine and preparing for testing

G Adhering to quality procedures

H Completing work reportforms accurately

I Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items

Note

Successful completion of relevant vendor training may be used to contribute to evidence on which competency is deemed In these cases the alignment of outcomes of vendor training with performance criteria and critical aspects of evidence shall be clearly identified

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

Resources required to assess this unit are listed above in Context of assessment which should also be used in the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

The resources used for assessment should reflect current industry practices in relation to rewinding three phase induction machines rated for high voltage above kV

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the industry to which this unit applies This requires assessment in a structured environment which is primarily intended for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with unit

UEENEEGA

UEENEEG155A

Rewind HV three phase induction machines rated for voltages to kV

UEENEEGA

UEENEEG158A

Conduct electrical tests on HV electrical machines

The critical aspects of occupational health and safety covered in unit UEENEEEA and other discipline specific occupational health and safety units shall be incorporated in relation to this unit

The critical aspects of occupational health and safety covered in unit UEENEEE101A and other discipline specific occupational health and safety units shall be incorporated in relation to this unit.


Range Statement

10) This relates to the unit as a whole providing the range of contexts and conditions to which the performance criteria apply. It allows for different work environments and situations that will affect performance.

This unit shall be demonstrated in relation to dismantling and winding stators for at least two different three phase induction machines at for HV above 3.3 kV in an environment designed specifically for the purpose.

Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.