Electrical Systems… · SHS3 Applied Technology

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.12 - Detect fault in electrical machines

By the end of the lesson, learners can:

Identify and describe at least four major types of faults that occur in electrical machines (bearing faults, stator or armature faults, broken rotor bar and end ring faults, and open or shorted transformer windings).
Match each fault type to its characteristic symptom(s), such as noise, overheating, failure to start, wobbling, or no output.
Explain at least three diagnostic methods used to detect faults in electrical machines (visual inspection, listening/noise check, temperature check, and testing with instruments such as a multimeter or megger).
Demonstrate the ability to work collaboratively in mixed-ability groups to outline faults and their symptoms and present findings orally and in writing.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

Curriculum details

Strand: Electrical and Electronic Technology (Strand 5)
Sub-strand: Electrical Systems Design (5.1)
Content standard: 3.5.1.CS.1 - 3.5.1.CS.1 Apply knowledge and understanding of electrical Machines 3.5.1.LO.1 Demonstrate knowledge and understanding of electrical Machines and appliances and apply the knowledge in servicing electrical appliances and circuits
Indicator: 3.5.1.LI.12 - Detect fault in electrical machines
Suggested placement: Semester 2, Week 13 (Week 33 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

content standard text - p.185: prints the content-standard code as "2.4.1.CS.1"; filed under the section's own 3.5.1.CS.1
content standard text - p.185: prints the learning-outcome code as "2.4.1.LO.1"; filed under the section's own 3.5.1.LO.1
content standard text - p.185: the front page prints "Strand 4." for Electrical and Electronic Technology inside the YEAR THREE section, where Year 3's strand 4 is Wood Technology (printed pp.164 and 170); the Contents page (printed p.6) prints "STRAND 5. ELECTRICAL AND ELECTRONIC TECHNOLOGY" for Year 3 and Year 2 numbers the same strand 5, so the row is filed under strand 5
indicator text - p.185: prints the learning-indicator code as "2.4.1.LI.12"; filed under the section's own 3.5.1.LI.12
exemplars - p.185: prints the assessment code as "2.4.1.AS.12"; filed under the section's own 3.5.1.AS.12
Curriculum reference: NaCCA curriculum document, p. 185

Exemplars (from the NaCCA curriculum)

Focal Area : Fault In Electrical Machines
1. Nature/ types of faults
2. Symptons of each fault Faults
- Bearing faults (Noise, over heating)
- Stator or Armature Fault ( Motors may not start, Generators will produce no output)
- Broken rotor bar and end ring faults (Noise and wobbling)
- Open or shorted transformer windings (No output, over heating) Pedagogy
Research and Collaboration: Organise the learners into mixed-ability and gender inclusive groups and task them to undertake the following practical activities: Outline major faults in electrical machines and associated symptoms. Describe diagnostic methods used to identify faults these faults.

Assessment (3.5.1.AS.12). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.