NZQA registered unit standard
Title
Rewind electric machines
Level
4
Purpose
19470 version 4
Page 1 of 4
Credits
10
This unit standard is intended for people wishing to qualify in
the electrical industry in motor rewinding and repair. It is for
people who have responsibility for winding, connecting, and
insulating electric machine coils.
People credited with this unit standard are able to:
–
record winding data;
–
assess insulation requirements;
–
wind coils;
–
insert and connect coils; and
–
impregnate windings as required.
Classification
Electrical Engineering > Electrical Machines
Available grade
Achieved
Explanatory notes
1
This unit standard has been developed for learning and assessment on-job.
2
This unit standard is one of a series designed to cover the rewinding of electric
machines normally removed to a motor rewinding workshop. The unit standards and
the sequence are as follows:
Unit 1184, Test, and locate and diagnose faults in electrical machine windings
Unit 1185, Prepare electrical machines for rewinding
Unit 19470, Rewind electric machines
Unit 19471, Reassemble and test electric machines following rewinding.
Reinstallation and commissioning are covered in:
Unit 2014, Overhaul a.c. rotating machines and control equipment
Unit 5928, Overhaul d.c. rotating machines and control equipment.
3
Definitions
Industry practice – those practices that competent practitioners within the industry
recognise as current industry best practice.
Machines – electric motors, generators, regulators, transformers, and other similar
equipment that have windings.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4
19470 version 4
Page 2 of 4
Assessment
a The machines chosen are left to the discretion of the assessor, but must be
sufficient to assess competence in all outcomes of the unit.
b Performance in relation to the outcomes of this unit standard must comply with the
Health and Safety in Employment Act 1992, associated regulations and any
applicable company safety and health procedures.
Outcomes and evidence requirements
Outcome 1
Record winding data.
Evidence requirements
1.1
Necessary data is assembled in accordance with industry practice.
Range
data may include but is not limited to – manufacturers’ technical
information sheets (if available), data obtained during dismantling,
customers specifications.
1.2
The insulation class is obtained.
1.3
Data is recorded in accordance with company requirements.
Range
coils per slot, number of turns per coil, direction of turns; conductor
size; coil shape and dimensions; insulation types, thickness and
layers; connections; coil pitch, commutator pitch.
Outcome 2
Assess insulation requirements.
Evidence requirements
2.1
Requirements of machine insulation are assessed.
Range
2.2
insulation class; materials – varnishes, mica and its derivatives,
fibre, tape, insulation cloths; slot lining insulation;
properties – physical strengthening and filling abilities, dielectric
strength, rigidity, imperviousness to moisture, dust, dirt, oil, and
corrosive substances.
Availability of insulation material is confirmed, or alternatives are sought.
Outcome 3
Wind coils.
Evidence requirements
3.1
Winding equipment is set up in accordance with collected data.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3.2
19470 version 4
Page 3 of 4
Coils are wound in accordance with customer specifications and industry
standards.
Outcome 4
Insert and connect coils.
Evidence requirements
4.1
Coil slot insulation is verified to be in accordance with industry standards.
4.2
Coil end overhang is wound in accordance with manufactures’ specifications.
4.3
Thermal protection devices are selected and inserted into windings at specified
locations in accordance with specifications.
4.4
Rotor surfaces are re-banded to original specifications, so that bands do not
protrude above surfaces.
4.5
Tails are sleeved and connected.
4.6
Connections are tested for open circuit, short circuit, abnormal resistance, test
to earth, inductance and impedance.
Outcome 5
Impregnate windings as required.
Evidence requirements
5.1
Windings are pre-heated according to varnish manufacturers’ specifications.
5.2
Windings are saturated with varnish in accordance with available equipment,
machine type, machine size, and grade of varnish.
Range
5.3
Excess varnish is removed.
Range
5.4
brushing, spraying, dipping, vacuum pressure impregnation.
Evidence of two is required.
rotor and stator surfaces, slip-rings and commutators, shaft.
Varnish is baked on in accordance with the manufacturers’ specifications.
Range
tables of temperatures and times.
Replacement information
The Skills Organisation
SSB Code 100401
This unit standard and unit standard 19469 replaced unit
standard 1198.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
19470 version 4
Page 4 of 4
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
26 August 2002
31 December 2013
Review
2
22 August 2008
N/A
Rollover and
Revision
3
15 March 2012
N/A
Revision
4
15 January 2014
N/A
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact The Skills Organisation reviewcomments@skills.org.nz if you wish to
suggest changes to the content of this unit standard.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016