Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

MARL6015A Mapping and Delivery Guide
Demonstrate intermediate knowledge of marine electrical systems

Version 1.0
Issue Date: December 2018


Qualification -
Unit of Competency MARL6015A - Demonstrate intermediate knowledge of marine electrical systems
Description This unit involves the skills and knowledge required to analyse complex switchboards, perform fault finding on electrical circuits, maintain circuit breakers, synchronise alternators and maintain emergency battery systems to ensure supply of shipboard electrical power on board a commercial vessel.
Employability Skills This unit contains employability skills.
Learning Outcomes and Application This unit applies to the work of a Marine Engineer Class 2 on commercial vessels greater than 3000 kW and forms part of the requirements for the Certificate of Competency Marine Engineer Class 2 issued by the Australian Maritime Safety Authority (AMSA).
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.
Prerequisites/co-requisites Not applicable.
Competency Field
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities
Slides
PPT
Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: Analyse common faults in shipboard electrical machinery
  • Effects and ways of detecting earth on 3wire insulated and 4wire earthed neutral systems are explained
  • Effects of short circuits and operation of discrimination protection are explained
  • Symptoms and effects of ‘light’ and ‘heavy’ short circuits on components and circuits are compared
  • Effects of open circuits on systems and components transformers are analysed
  • Causes and effects of ‘hot spots’ in circuits are identified
  • Cause and effects of static electricity on shafting and when cleaning tanks are identified
       
Element: Perform fault- finding on electrical circuits
  • Safe procedure for determining insulation resistance of a 3phase motor or alternator including protection of solidstate components and selection of suitable minimum insulation for the component is applied
  • Procedure for safely drying out an electrical machine with a low IR is outlined
  • Open circuit in a 3phase motor is safely tested
  • Procedure for testing internal short circuit in a 3phase motor is clarified
       
Element: Analyse complex shipboard switchboard layouts
  • Switchboard layouts are interpreted
  • Effects and indications of earths on the system including intermittent and multi earths are explained
  • Safe procedure for locating earths on main and low voltage circuits including 24 V system is outlined
  • Operation of preferential tripping arrangements for overload protection is explained
  • Relationship between main and emergency switchboards is explained
  • Different methods of start up after black outs are outlined
       
Element: Explain electrical safety procedures for ship and shore personnel
  • Potential problems associated with shore maintenance personnel working on ship electrical equipment are identified
  • Safe procedure of isolating electrical machinery for repair or maintenance is applied
  • Safe method of working on live electrical circuitry for purpose of repair or maintenance is explained
  • Problems associated with shipboard electrical fires are explained
  • Safe procedures for fighting shipboard electrical fires including fires in switchboards are clarified
       
Element: Synchronise, parallel and load share alternators on manual and auto modes
  • Process of manually synchronising alternator and sharing kW and kVAR loading under all loading conditions is explained
  • Process of starting, testing and where applicable, of transferring emergency generator power on to main board, is explained
  • Operation of synchronising lights, synchroscope and all meters associated with synchronising is outlined
  • Operation of AVR and prime mover governor with respect to synchronising is outlined and how these can be adjusted at set points is explained
       
Element: Examine operation, construction and maintenance of circuit breakers
  • Features and applications of different types of circuit breakers are differentiated
  • Closing and opening systems of circuit breakers are explained
  • Arc extinguishing systems are explained
  • Method for accessing an air circuit breaker for inspection is analysed
  • Function and operation of protection devices associated with air circuit breaker and molded case circuit breaker are examined
       
Element: Analyse function of emergency battery systems
  • Different types and characteristics of batteries used for emergency supplies are identified
  • Methods of battery charging and ways in which charge condition of the battery can be determined are explained
  • Requirements of emergency supply and how transfer can occur without adversely affecting solid state components are explained
  • Safety hazards associated with batteries, and procedures to be adopted to minimise explosion and short circuits are appraised
       
Element: Explain hazards associated with marine high voltage installations
  • Functional and operational requirements for a marine high voltage system are outlined
  • High voltage marine installations are identified
  • Design features of high voltage installations are explained
  • Risks and safety procedures associated with working in high voltage environments are identified
  • Procedure for assisting suitably qualified personnel to carry out maintenance and repair of high voltage installation is outlined
       


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, the required skills and knowledge, the range statement and the Assessment Guidelines for the Training Package.

Critical aspects for assessment and evidence required to demonstrate competency in this unit

The evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the Elements, Performance Criteria, Required Skills, Required Knowledge and include:

providing accurate and reliable information

providing appropriate level of detail in responses.

Context of and specific resources for assessment

Performance is demonstrated consistently over time and in a suitable range of contexts.

Resources for assessment include access to:

industry-approved marine operations site where intermediate knowledge of marine electrical systems can be demonstrated

technical reference library with current publications on marine electrical systems

tools, equipment and personal protective equipment currently used in industry

relevant regulatory and equipment documentation that impacts on work activities

range of relevant exercises, case studies and/or other simulated practical and knowledge assessments

appropriate range of relevant operational situations in the workplace.

In both real and simulated environments, access is required to:

relevant and appropriate materials and equipment

applicable documentation including workplace procedures, regulations, codes of practice and operation manuals.

Method of assessment

Practical assessment must occur in an:

appropriately simulated workplace environment and/or

appropriate range of situations in the workplace.

A range of assessment methods should be used to assess practical skills and knowledge. The following examples are appropriate to this unit:

direct observation of the candidate demonstrating intermediate knowledge of marine electrical systems

direct observation of the candidate applying relevant WHS/OHS requirements and work practices.

Guidance information for assessment

Holistic assessment with other units relevant to the industry sector, workplace and job role is recommended.

In all cases where practical assessment is used it should be combined with targeted questioning to assess Required Knowledge.

Assessment processes and techniques must be appropriate to the language and literacy requirements of the work being performed and the capacity of the candidate.


Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)


Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

Required Skills:

Assess own work outcomes and maintain knowledge of current codes, standards, regulations and industry practices

Explain intermediate principles of electrical circuits, switchboards, alternators and circuit breakers

Identify and interpret numerical and graphical information in electrical diagrams and specifications for a commercial vessel

Identify and suggest ways of rectifying electrical hazards and emergency situations on a vessel

Identify methods, procedures and materials needed for testing marine electrical systems

Impart knowledge and ideas through verbal , written and visual means

Read and interpret written information related to electrical circuitry and components on commercial vessels

Use electrical measuring and testing instruments

Required Knowledge:

Alternating current (AC)/direct current (DC) voltage

Alternators – construction, characteristics, synchronised operation

Batteries

Circuit breakers

Circuits

Earthing

Electrical measuring and testing instruments

Electrical safe working practices

Electrical symbols, basic electrical diagrams/circuits

Emergency battery systems

Fault finding procedures

Isolation procedures

Phase angle, power factor and current flow

Procedures for dealing with hazards and emergencies

Regulations of relevant state/territory maritime and electrical licensing authorities

Resistance, inductance and capacitance

Risks and safety procedures associated with working in high voltage environments

Safety, environmental and hazard control precautions and procedures relevant to marine electrical systems

Switchboards and protection – purpose, testing and maintenance, equipment removal

Work health and safety (WHS)/occupational health and safety (OHS) legislation and policies

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below.

Systems and components may include:

Motors

Transformers

Switchboard layouts may include:

DC systems

Dedicated power supplies

Dual supply for steering gear

Feed back and feed forward arrangements

Interconnection with low voltage

Problems may include:

Electric shock

Enclosed space work

Noncompliance with safe working procedures

Unfamiliar with marine electrical systems

Using equipment beyond safe working limits

Working at heights

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
Effects and ways of detecting earth on 3wire insulated and 4wire earthed neutral systems are explained 
Effects of short circuits and operation of discrimination protection are explained 
Symptoms and effects of ‘light’ and ‘heavy’ short circuits on components and circuits are compared 
Effects of open circuits on systems and components transformers are analysed 
Causes and effects of ‘hot spots’ in circuits are identified 
Cause and effects of static electricity on shafting and when cleaning tanks are identified 
Safe procedure for determining insulation resistance of a 3phase motor or alternator including protection of solidstate components and selection of suitable minimum insulation for the component is applied 
Procedure for safely drying out an electrical machine with a low IR is outlined 
Open circuit in a 3phase motor is safely tested 
Procedure for testing internal short circuit in a 3phase motor is clarified 
Switchboard layouts are interpreted 
Effects and indications of earths on the system including intermittent and multi earths are explained 
Safe procedure for locating earths on main and low voltage circuits including 24 V system is outlined 
Operation of preferential tripping arrangements for overload protection is explained 
Relationship between main and emergency switchboards is explained 
Different methods of start up after black outs are outlined 
Potential problems associated with shore maintenance personnel working on ship electrical equipment are identified 
Safe procedure of isolating electrical machinery for repair or maintenance is applied 
Safe method of working on live electrical circuitry for purpose of repair or maintenance is explained 
Problems associated with shipboard electrical fires are explained 
Safe procedures for fighting shipboard electrical fires including fires in switchboards are clarified 
Process of manually synchronising alternator and sharing kW and kVAR loading under all loading conditions is explained 
Process of starting, testing and where applicable, of transferring emergency generator power on to main board, is explained 
Operation of synchronising lights, synchroscope and all meters associated with synchronising is outlined 
Operation of AVR and prime mover governor with respect to synchronising is outlined and how these can be adjusted at set points is explained 
Features and applications of different types of circuit breakers are differentiated 
Closing and opening systems of circuit breakers are explained 
Arc extinguishing systems are explained 
Method for accessing an air circuit breaker for inspection is analysed 
Function and operation of protection devices associated with air circuit breaker and molded case circuit breaker are examined 
Different types and characteristics of batteries used for emergency supplies are identified 
Methods of battery charging and ways in which charge condition of the battery can be determined are explained 
Requirements of emergency supply and how transfer can occur without adversely affecting solid state components are explained 
Safety hazards associated with batteries, and procedures to be adopted to minimise explosion and short circuits are appraised 
Functional and operational requirements for a marine high voltage system are outlined 
High voltage marine installations are identified 
Design features of high voltage installations are explained 
Risks and safety procedures associated with working in high voltage environments are identified 
Procedure for assisting suitably qualified personnel to carry out maintenance and repair of high voltage installation is outlined 

Forms

Assessment Cover Sheet

MARL6015A - Demonstrate intermediate knowledge of marine electrical systems
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessor name:

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Date:


Assessment Record Sheet

MARL6015A - Demonstrate intermediate knowledge of marine electrical systems

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

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