Consultation outcome

11. ETO - Electrical Motors and Generators

Updated 12 July 2023

ETO - STCW III/6 CoC
Competency/ Module: Marine Engineering: Electrical Motors and Generators      
Knowledge, understanding and proficiency Recommendation of working group regarding the outcome and objective. Rationale Action required
Outcome1: Explain and solve problems on three-phase circuits Keep Relevant None
1.1Balanced star and delta connected loads Keep Relevant None
1.2 Power factor Keep Relevant None
1.3 Phasor diagrams Keep Relevant None
1.4 Unbalanced loads Keep Relevant None
1.5 Marine three phase systems Keep Relevant None
Outcome 2: Explain the principles of and solve problems on magnetism and electromagnetic induction Keep Relevant None
2.1 Non- magnetic and ferromagnetic materials Keep Relevant None
2.2 Non-composite magnetic circuits Keep Relevant None
2.3 Composite magnetic circuits Keep Relevant None
2.4 Current carrying conductor Keep Relevant None
2.5 Electro- motive- force in a coil Keep Relevant None
2.6 Self and mutual inductance Keep Relevant None
2.7 Electro motive force in a conductor Keep Relevant None
Outcome 3: Explain the action of generators Keep Relevant None
3.1 Constructions and connections of a.c. synchronous generators - Excitation methods - Full load current and rotor speed - Voltage and frequency in a.c. synchronous generators. - Synchronising using lamps, synchroscope and load sharing - Sychronising and load sharing - Automatic voltage regulators for a.c. generators - Failure of automatic voltage regulators - Causes of failures - Motoring and its effects - Preference trips - Operation and testing of a preference trip - Insulated and earthed neutral systems - Operation of reverse power relays - Earth fault detection - Methods of protection for a.c. synchronous generators Modernise Testing preference trips is an annual Lloyd’s requirement and is routinely demonstrated by ships staff. Expanded this outcome to include “Operation and testing of a preference trips”.
3.2 Excitation methods Keep Relevant None
3.3 Full load current and rotor speed Keep Relevant None
3.4 Voltage and frequency in a.c. synchronous generators Keep Relevant None
3.5 Synchronising using lamps, synchroscope and load sharing Keep Relevant None
3.6 Sychronising and load sharing Keep Relevant None
3.7 Automatic voltage regulators for a.c. generators Keep Relevant None
3.8 Failure of automatic voltage regulators Keep Relevant None
3.9 Causes of failures Keep Relevant None
3.10 Motoring and its effects Keep Relevant None
3.11 Preference trips Keep Relevant None
3.12 Operation of a preference trip Keep Relevant None
3.13 Insulated and earthed neutral systems Keep Relevant None
3.14 Operation of reverse power relays Keep Relevant None
3.15 Earth fault detection Keep Relevant None
3.16 Methods of protection for a.c. synchronous generators Keep Relevant None
Outcome 4: Explain and solve problems on the action of motors Keep Relevant None
4.1 Principles and characteristics of induction motors Keep Relevant None
4.2 Production of torque Keep Relevant None
4.3 Slip Keep Relevant None
4.4 Slip formula Keep Relevant None
4.5 Torque/speed characteristic Keep Relevant None
4.6 Rotor resistance Keep Relevant None
4.7 Power flow chart Keep Relevant None
4.8 Shaft output power and efficiency Keep Relevant None
4.9 Operation of synchronous motors Keep Relevant None
4.10 Construction of stators and rotors for induction and synchronous motors Keep Relevant None
4.11 Speed control Modernise We must ensure different types of speed controls and motors are covered in the syllabus. Include Variable Frequency Drives (VFD) and 2 speed motors in this outcome
4.12 Phasor diagrams Keep Relevant None
4.13 Synchronous and induction motors for marine propulsion Modernise We must ensure modern speed control methods are covered in the syllabus. Include the implementation of speed control for PEMs.
Proposal submitted by: Any other outcomes for this competency, above and beyond STCW which would be needed due to use of modern technology and impact of future fuels onboard:    
  Objective Reason Why Action required
Cadet Training & Modernisation Working Group Include Human Element Factors throughout the syllabus To provide seafarers with a contextualised understanding of the Human Element in the maritime industry, showing how they can put theory into practice in the work they carry out at sea. Raise awareness throughout the Cadet’s training of the areas in which human element factors will have an impact. Recommendations on where this can be included have been noted throughout the entire syllabus. Not every template has Human Element Factor recommendations but please do add any you feel may have been missed.
Cadet Training & Modernisation Working Group Include Data Science skills throughout the syllabus Data Science Skills (Comprehension, Analysis, Presentation, etc…) are already required within much of the syllabus. A further, specific focus on these skills needs to be taught where relevant. A specific topic will need to be introduced to improve Cadets’ Data Science skills. Practical application of data science skills should be highlighted throughout the syllabus. Not every template has Data Science recommendations but please do add any you feel may have been missed.
Cadet Training & Modernisation Working Group Ensure all outcomes are contextualised to help Cadets understand what they are learning in relation to what they will experience at sea. While some outcomes are intrinsically linked to work carried out at sea, some need to be contextualised to show how they apply to work on board. Where this is the case, it is important to make sure Cadets clearly understand how the outcome relates to work at sea and it is essential to make sure that this context is given with reference to current and future seagoing technologies and practices. Where outcomes do not specifically cover a topic which relates to work carried out at sea, more must be done to contextualise the outcome and make it relevant to the maritime industry, giving specific shipping examples of how the outcome may be applied in a modern shipping context. Not every template has contextualisation recommendations but please do add any you feel may have been missed.