Course info

1.

A1

Main Topic:  Electrical Motors              

Contact Hrs.:       14                         Lecture Hrs:11                         Tutorial hours: 03

Domain:    Cognitive                         Level of the objective:  Knowledge

Pre requisite knowledge: Science Basics 

1.1 A.C. Motors

1.2 D.C. Motors

Black Board, White Board,

Marker,PPT

1.1.1 State the normal supply for three-phase induction motors

1.1.2 Name the types of motor commonly used on board ships, giving their applications

1.1.3 Given the actual components from a three-phase induction motor, identify:

- rotor

- bearings

- fan

- stator

- field windings

- rotor cage

- method of lubrication

- terminals

1.1.4 Different motor enclosures

- Drip proof

- Totally enclosed

- Deck over weight

- Flame proof

1.1.5 Sketch a graph showing speed and load and between current and load, from no load to full load

1.1.6 Explain the meaning of all the information displayed, given a motor name plate

1.1.7 Explain in simple terms how torque is produced in an induction motor.

1.1.8 Explain why slip is essential

1.2.1 Explain what is meant by the back e.m.f. (Eb) of a motor

1.2.2 Relate the supply voltage to the back e.m.f. and to the voltage drop in the armature

(V = Eb 4- la Ra)

1.2.3 Explain why the starting current is high compared to the load current

1.2.4 Explain why a starter is required and the principle involved

1.2.5 State that rational speed (N) is approximately proportional to: applied voltage/filed flux

1.2.6 Explain from the above objective, how the rational speed is affected by:

- varying the voltage

- varying the strength of the magnetic field

1.2.7 Describe typical applications of:

- shunt motors

- series motors

1.2.8 In compound motors, explain what is meant by:

- long shunt

- short shunt

- cumulatively connected

3 Hrs.

2 Hrs.

1Hr

3Hrs

1Hr

3Hrs

1 Hr

Tot. 14Hrs

2.

B1

Main Topic:  Three Phase Induction Motors               

Contact Hrs.:     06                           Lecture Hrs:04                       Tutorial hours: 02        

Domain:    Cognitive                         Level of the objective:  Knowledge

Pre requisite knowledge: Science Basics 

1.1 Salient Features of Three Phase Induction motors

1.2 Basics of Starting and

Running of Three Phase Induction motors

Black Board, White Board,

Marker,PPT

1.1.1 Construction, principle of operation of 3-phase induction

1.1.2 Design features of star and delta motors

1.2.1 Starting, speed control and braking methods of 3-ph induction motor

1.2.2 Load-torque characteristics and protection

3.

C1

Main Topic:  Three Phase Synchronous Motors               

Contact Hrs:       04                          Lecture Hrs:03                      Tutorial hours: 01     

Domain:    Cognitive                         Level of the objective:  Knowledge

Pre requisite knowledge: Science Basics 

1.1 Salient Features of Three phase Synchronous motors

1.2 Load

Characteristics and power factor improvement

Black Board, White Board,

Marker,PPT

1.1.1 Construction

1.1.2 Principle of operation

1.2.1 Load characteristics

1.2.2 Power factor improvement with synchronous motors

4. D1

Main Topic:  Electrical Motor Starting Methodologies               

Contact Hrs:       08                          Lecture Hrs:06                      Tutorial hours: 02     

Domain:    Cognitive                         Level of the objective:  Knowledge

1.1 Electrical motor starting methodologies for DC Motors

1.2 Electrical motor

starting methodologies for AC Motors

1.3 Recovery after Power supply

failure (blackout)

Black Board, White Board,

Marker,PPT

1.1.1 Explain the following starting methods for D.C. motors and its characteristics:

- starting rheostat

- automatic starter

1.2.1 Explain the following starting methods for A.C. motors and its characteristics:

- direct on line starting

- star- delta starting

- compensator starting

1.2.2 State what should be taken into consideration when selecting starting methods

for A.C. motors

1.3.1 Explain specific conditions of blackout and procedures for recovery responding

to their causes taking a physical system as an example, including the following:

Explain Equipment / installations to be promptly addressed and

Explain Sequential restarting of auxiliaries

5 E1

Main Topic:  Electrical Motor Protection               

Contact Hrs.:       03                         Lecture Hrs:02                      Tutorial hours: 01     

Domain:    Cognitive                         Level of the objective:  Knowledge

1.1 Electrical Motor Protection Components and Circuits

Black Board, White Board,

Marker,PPT

1.1.1 Explain the basic reason for the provision of motor protection

1.1.2 Explain the principles of the most common overcurrent relays

1.1.3 Explain the difference between the largest possible overload current and a fault

current

1.1.4 Describe the function of overcurrent trip, time delays and fuses with both

overload and fault currents

1.1.5 Explain the basis upon which fuses are chosen

1.1.6 Explain the principle of a thermal relay, including the means of its adjustment

1.1.7 Explain what is meant by single phasing and its effects on a motor:

- when running

- when starting

- if continued attempts to start are made

1.1.8 Describe the principle the protection against running with a phase open

circuited

1.1.9 Explain why under voltage trips are necessary

6 F1

Main Topic:  Electrical Motor Speed Control              

Contact Hrs:       09                          Lecture Hrs:07                      Tutorial hours: 02

Domain:    Cognitive                         Level of the objective:  Knowledge

1.1 Suitable Operating conditions with respect to speed

1.2 Basic Speed Control Methods

1.3 Effect of varying frequency and voltage of A.C.

1.4 Insulated Gate Bipolar Transistor (IGBT) motor speed control

1.5 Motor speed control by thyristors

Black Board, White Board,

Marker,PPT

1.1.1 State applications where the following speeds are suitable:

- single fixed speed

- two or three fixed speeds

- infinitely variable speed

1.1.2 Describe briefly how stepped speeds can be provided

1.1.3 List the means of producing variable speed

1.2.1 Describe the principle of the Ward-Leonard drive

1.2.2 Explain the principle of a variable-frequency motor

1.3.1 Explain Speed

1.3.2 Explain Temperature

1.3.3 Explain Torque

1.3.4 Explain Power Output

1.3.5 Explain Starting Time, Current

1.4.1 Explain Gate Driving Characteristics with High Current

1.4.2 Explain High Frequency, High Current Switch

1.4.3 Explain Advantages of IGBT In Varying Motor Speed Control

1.5.1 Explain Application of thyristors in motor speed control

7 G1

Main Topic:  High-voltage Installations and Their Operational Safety               

Contact Hrs:       16                          Lecture Hrs:12                      Tutorial hours: 04

Domain:    Cognitive                         Level of the objective:  Knowledge

1.1 Design features of high-voltage installations

1.2 Operational safety of high voltage installations

Black Board, White Board,

Marker,PPT

1.1.1 Explain Generation and Distribution of High Voltage On Ships

1.1.2 Explain Electric Propulsion System

1.1.3 Explain Synchro-Convertors And Cyclo-Convertors

1.1.4 Describe Functional, Operational and Safety Requirements for a Marine High Voltage System

1.1.5 Describe Assigning Qualified Personnel to Carry Out Maintenance and Repair of

High-Voltage Switchgear of various types

1.1.6 Describe High-Voltage System Advantages

1.1.7 Describe Advantages of an Insulated System

1.1.8 Explain High-Voltage Circuit Breakers

1.1.9 Explain High-Voltage Cable

1.1.10 Explain High-Voltage Fuses

1.1.11 Explain Remedial Action Necessary During Faults in A High-Voltage System

1.1.12 Explain Switching Strategy for Isolating Components of a High-Voltage System

1.1.13 Explain Selection of Suitable Apparatus for Isolation and Testing of High-Voltage

Equipment

1.1.14 Explain Switching and Isolation Procedure On a Marine High-Voltage System,

Complete with Safety Documentation

1.1.15 Explain Performance Of Insulation Resistance And Polarization Index On High Voltage Equipment

1.2.1 Explain how to use HV personal protection equipment (PPE): insulated gloves,

goggles, insulating bars, insulating footwear, mates, earthing cables, HV testers

1.2.2 Explain terms of certification of personal protection equipment

1.2.3 Explain HV safety procedures:

- permission and coordination of HV works

- information, warnings and protection against unauthorized influence on safety

1.2.4 Explain HV safety procedures (cont.):

- assisting during HV work

- checking for voltage presence before any work starts

1

Attendance

5

2

Class Discipline

5

3

Class test (2 in nos)

20

As per IMU Guidelines

As per IMU Guidelines

4

Assignment

70

As per IMU Guidelines

As per IMU Guidelines