11. ETO - Electrical Motors and Generators
Updated 12 July 2023
ETO - STCW III/6 CoC | |||
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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. |