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Evidence Guide: MARL6021A - Demonstrate advanced knowledge of marine electrical systems

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

 

MARL6021A - Demonstrate advanced knowledge of marine electrical systems

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

Evaluate advanced electrical layout systems

  1. Effects of power factor changes on prime mover, alternator and electrical system are analysed
  2. Methods of altering load power factor by means of capacitors or synchronous machines are explained
  3. Methods of obtaining constant frequency from a variable frequency output such as a main engine driven alternator and/or variable speed drives for a self discharging equipment are explained
  4. Protecting systems available for shaft driven alternators are evaluated
Effects of power factor changes on prime mover, alternator and electrical system are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Methods of altering load power factor by means of capacitors or synchronous machines are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Methods of obtaining constant frequency from a variable frequency output such as a main engine driven alternator and/or variable speed drives for a self discharging equipment are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Protecting systems available for shaft driven alternators are evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse construction and principles of operation of different types of marine alternators

  1. Construction and operating parameters of different types of marine alternators are compared and contrasted
  2. Cooling systems, leak detection, monitoring and protection systems in different types of marine alternators are compared and contrasted
  3. Procedures for drying out an alternator with a low insulation resistance are explained
  4. Excitation systems and methods of flashing alternator after loss of excitation are appraised
  5. Systems used for protecting against high winding temperatures, circulating currents, loss of excitation and internal short circuit are evaluated
Construction and operating parameters of different types of marine alternators are compared and contrasted

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Cooling systems, leak detection, monitoring and protection systems in different types of marine alternators are compared and contrasted

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Procedures for drying out an alternator with a low insulation resistance are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Excitation systems and methods of flashing alternator after loss of excitation are appraised

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Systems used for protecting against high winding temperatures, circulating currents, loss of excitation and internal short circuit are evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse different types of direct current (DC) and alternating current (AC) marine motors

  1. Different types and applications of marine motors are compared and contrasted
  2. Difference between types of encapsulation is explained and where they should be used is justified
  3. Motor ratings and effect of overloading on different types of motor are assessed
  4. Possible operational problems associated with marine motors are analysed and appropriate remedial action is devised
  5. Procedure for drying out a motor that has become unserviceable due to either long-term storage or immersion in seawater is formulated
  6. Effects of operating star connected motors compared with delta connected motors are distinguished and when this may be required is suggested
  7. Different types and applications of special motors for deck and cargo operation are analysed
Different types and applications of marine motors are compared and contrasted

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Difference between types of encapsulation is explained and where they should be used is justified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Motor ratings and effect of overloading on different types of motor are assessed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Possible operational problems associated with marine motors are analysed and appropriate remedial action is devised

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Procedure for drying out a motor that has become unserviceable due to either long-term storage or immersion in seawater is formulated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effects of operating star connected motors compared with delta connected motors are distinguished and when this may be required is suggested

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Different types and applications of special motors for deck and cargo operation are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse requirements of motor starters for 3 phase and synchronous motors

  1. Differentiation is made between different types of motor starters
  2. Different types of starters are evaluated in terms of starting torque and current, and these are related to particular motor applications
  3. Simple starter circuit diagrams are evaluated and operating principles of motor starters are explained
  4. Documentation and circuit and wiring diagrams for fault-finding in motor starters are used
  5. Routine maintenance program for monitoring vibration and insulation resistance levels of motors is designed
Differentiation is made between different types of motor starters

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Different types of starters are evaluated in terms of starting torque and current, and these are related to particular motor applications

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Simple starter circuit diagrams are evaluated and operating principles of motor starters are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Documentation and circuit and wiring diagrams for fault-finding in motor starters are used

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Routine maintenance program for monitoring vibration and insulation resistance levels of motors is designed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse lighting systems used on board ships

  1. Common types and applications of lighting systems are evaluated
  2. Distribution layout systems are explained
  3. Fault-finding method for lights and starter systems, including lighting in hazardous areas, is planned using circuit diagrams
Common types and applications of lighting systems are evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Distribution layout systems are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Fault-finding method for lights and starter systems, including lighting in hazardous areas, is planned using circuit diagrams

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Evaluate alternator excitation system design

  1. Different types of excitation systems and impact of load changes are compared
  2. Type, location and function of components involved in excitation are examined
  3. Function, cooling, failure mode and procedures for testing and changing diodes are explained
  4. Functions of an AVR and how it may be incorporated into an excitation system are explained
  5. Process of fault-finding in an AVR and types, causes and remedies of common problems are explained
  6. How excitation systems impact on output in normal and adverse circumstances is assessed
Different types of excitation systems and impact of load changes are compared

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Type, location and function of components involved in excitation are examined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Function, cooling, failure mode and procedures for testing and changing diodes are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Functions of an AVR and how it may be incorporated into an excitation system are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Process of fault-finding in an AVR and types, causes and remedies of common problems are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

How excitation systems impact on output in normal and adverse circumstances is assessed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse power management and uninterruptable power systems (UPS) fitted to vessels

  1. Operational functions of power management systems during high load, overload and short circuit conditions are analysed
  2. Functions and components of UPS systems are evaluated
  3. Limitations of power management and UPS fitted to vessels are analysed
  4. System response under possible fault conditions of vessel power management and UPS are determined
Operational functions of power management systems during high load, overload and short circuit conditions are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Functions and components of UPS systems are evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Limitations of power management and UPS fitted to vessels are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

System response under possible fault conditions of vessel power management and UPS are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse vessel cathodic protection system

  1. Cathodic protection systems and how they interact are analysed
  2. Components of cathodic protection systems are identified and life cycle maintenance program is prepared
  3. Modifications required for operating parameters of cathodic protection systems when operating alongside an active wharf or another vessel are determined
  4. Likely causes of corrosion in relation to size, location or distribution of anodes or current densities are assessed
  5. Other corrosion problems in shipboard environment that may be cause of electrical problems are appraised
Cathodic protection systems and how they interact are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Components of cathodic protection systems are identified and life cycle maintenance program is prepared

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Modifications required for operating parameters of cathodic protection systems when operating alongside an active wharf or another vessel are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Likely causes of corrosion in relation to size, location or distribution of anodes or current densities are assessed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Other corrosion problems in shipboard environment that may be cause of electrical problems are appraised

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess requirements and components associated with electrical systems for hazardous spaces on board vessels

  1. Different types, limitation and nameplate identification of ‘E’ equipment are compared
  2. Requirements of classification societies are distinguished from administrations regarding electrical installations on board vessels
  3. Lighting and power supply requirements of pump rooms are identified
  4. Safety requirements for electrical equipment and safety practices on board vessels and how these are extended when alongside a berth are analysed
Different types, limitation and nameplate identification of ‘E’ equipment are compared

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Requirements of classification societies are distinguished from administrations regarding electrical installations on board vessels

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Lighting and power supply requirements of pump rooms are identified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Safety requirements for electrical equipment and safety practices on board vessels and how these are extended when alongside a berth are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess existing electrical shipboard equipment

  1. Existing and new shipboard electrical equipment and systems are compared to assess future requirements as well as potential problems and preventative measures
  2. Performance of existing shipboard electrical equipment and systems is analysed and cost effectiveness studies for modifications or improvements are prepared
  3. Factors involved in commissioning new electrical plant are evaluated
  4. Procedures involved in organising survey of existing plant are outlined
  5. Procedures involved in making recommendations for new systems consistent with modified new ship building requirements are outlined
Existing and new shipboard electrical equipment and systems are compared to assess future requirements as well as potential problems and preventative measures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Performance of existing shipboard electrical equipment and systems is analysed and cost effectiveness studies for modifications or improvements are prepared

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Factors involved in commissioning new electrical plant are evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Procedures involved in organising survey of existing plant are outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Procedures involved in making recommendations for new systems consistent with modified new ship building requirements are outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Appraise high voltage electrical motor propulsion systems

  1. Safety requirements for working with high voltage systems are identified
  2. Use of high voltage systems for propulsion and cargo handling is evaluated
  3. Safe maintenance methods for high voltage switchgear and machines are analysed
Safety requirements for working with high voltage systems are identified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use of high voltage systems for propulsion and cargo handling is evaluated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Safe maintenance methods for high voltage switchgear and machines are analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

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 advanced 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 advanced 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.

Required Skills and Knowledge

Required Skills:

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

Explain advanced principles of lighting, cathodic protection, high voltage systems and impart knowledge and ideas verbally, in writing and visually

Identify and interpret complex 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 operating, maintaining and repairing complex marine electrical systems

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

AC and DC marine motors

Alternators:

alternator excitation system design

construction

characteristics

synchronised operation

types

Cathodic protection system

Electrical:

layout systems

measuring and testing instruments

shipboard equipment

symbols, basic electrical diagrams/circuits

High voltage electrical motor propulsion systems

Lighting systems used on board ships

Motor starters for three-phase and synchronous motors

Phase angle, power factor, and current flow

Power management and UPS fitted to vessels

Procedures for dealing with hazards and emergencies

Requirements and components associated with electrical systems for hazardous spaces on board vessels

Resistance, inductance and capacitance

Safe electrical working practices

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

Range Statement

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.

Operating parameters may include:

Excitation current

Insulation grade

Operating temperature

Speed

Marine motors may include:

Polyphase

Reduced starting current motors

Single

Speed changing

Synchronous

Variable speed

Encapsulation may include:

Drip proof

Submersible

TEFC

Motor ratings may include:

Continuous

Short time

Operational problems may include:

Loss of insulation resistance

Open circuit

Overheating

Short circuit

Wrong connections

Different types and applications of special motors for deck and cargo operation may include:

Common faults

Remedies for common faults

Motor starters may include:

DOL

Primary and secondary resistance

Soft or electronic starters

Star-Delta

Transformer starter

Lighting systems may include:

Fluorescent

Halogen

Incandescent

LED

Mercury

Sodium vapour

Distribution layout systems must include:

Emergency lights

Safety lights

How excitation systems impact on output in normal and adverse circumstances must include:

Loss of excitation

Short circuit

Safety requirements may include:

Company requirements

Manufacturer requirements.

Statutory requirements