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Marine Engineering: Electrical Motors and Generators - Higher National Unit Specification, Assignments of Electrical Engineering

AMET UniversityElectrical Engineering

induction motor lecture notes for marine

Typology: Assignments

2019/2020

Uploaded on 04/14/2020

rajeevvalunjkar
rajeevvalunjkar 🇮🇳

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Higher National Unit specification: statement of standards (cont)
Unit title: Marine Engineering: Electrical Motors and Generators
Where calculations are performed the candidate must: apply appropriate
formulae. apply the principles of the calculation. show all working through
a calculation. Ensure their answer derives from the application of the
formula and correct application of the principles of the calculation.
Outcome 3
Explain the action of generators.
Knowledge and/or skills
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 of a preference trip
Insulated and earthed neutral systems
pf3
pf4
pf5

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Higher National Unit specification: statement of standards (cont) Unit title: Marine Engineering: Electrical Motors and Generators Where calculations are performed the candidate must: apply appropriate formulae. apply the principles of the calculation. show all working through a calculation. Ensure their answer derives from the application of the formula and correct application of the principles of the calculation. Outcome 3 Explain the action of generators. Knowledge and/or skills 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 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 Evidence Requirements Evidence for the knowledge and/or skills items in Outcome 3 will be provided on a sample basis. The evidence may be presented in responses to specific questions. Each candidate will need to demonstrate that they can correctly answer questions based on a sample of the knowledge and skills items listed in the Outcome. In any assessment of this Outcome, five out of sixteen knowledge and/or skills items should be sampled

Explain the operation and need for a reverse power relay. State the two advantages and two disadvantages of insulated neutral systems and earthed neutral systems for marine a.c. generators. Explain, with the aid of sketches, how earth faults are detected for single phase and three phase supplies. Explain two methods of protection for a.c. synchronous generators from the following: short circuit, over current, under voltage, earth faults, temperature extremes. Where calculations are performed the candidate must: apply appropriate formulae. apply the principles of the calculation. show all working through a calculation. ensure the answer derives from the application of the formula and correct application of the principles of the calculation. Evidence should be generated through assessment in supervised conditions. Assessment should be conducted under closed-book conditions and as such candidates should not be allowed to bring any textbooks, handouts or notes to the assessment. Candidates will be permitted to use scientific calculators during the assessment. Assessment guidelines The assessment of this Outcome may be combined together with that for Outcomes 1, 2 and 4 to form a single assessment paper, details of which are given under the Evidence Requirements for Outcome 4. It may also be assessed separately.

Unit title: Marine Engineering: Electrical Motors and Generators Outcome 4 Explain and solve problems on the action of motors. Knowledge and/or skills Principles and characteristics of induction motors Production of torque Slip Slip formula Torque/speed characteristic Rotor resistance Power flow chart Shaft output power and efficiency Operation of synchronous motors Construction of stators and rotors for induction and synchronous motors Speed control Phasor diagrams Synchronous and induction motors for marine propulsion. Evidence Requirements Evidence will be provided on a sample basis. Each candidate will need to demonstrate that they can correctly answer questions based on a sample of the knowledge and skills items listed in the Outcome. In any assessment of this Outcome, five out of thirteen knowledge and/or skills items should be sampled.

Explain the principles of synchronous motors. Explain the construction of stators and rotors for synchronous motors. Explain how speed control is achieved in either an induction motor or a synchronous motor. Explain, with the aid of phasor diagrams, how the power factor can be improved. Calculate efficiency for either induction or synchronous motor.