Practical Marine Electrical Knowledge: Program 8. Electric Propulsion & High Voltage Practice

This is Program 8 of VIDEOTEL series on Practical Marine Electrical Knowledge.

Designed to assist sea-going personnel in their understanding of the safe operation, testing and maintenance of ships electrical equipment and services. Examines practical electrical maintenance and fault-finding procedures on board various ship types.

The series is made up of 8 programs. This program highlights recent advances of electric propulsion together with high voltage operation, safety and testing.

There are many system variations around. So, it's most important that you become familiar with the components of the electrical system and the layout of the main switchboard immediately you join a ship. Pay attention to the layout of the emergency switchboard. This study will pay dividends during a blackout or when troubleshooting in cause of major breakdown.
Electric Propulsion & High Voltage Practice

Electrical Safety Golden Rule is: Before any work is done on the electrical installation, first, isolate the circuit by removing the supply fuses or locking the circuit-breaker in the open position. So, then the circuit cannot be energized accidentally. Then, post a warning sign to alert others that the circuit is being worked down. Then prove the circuit dead with voltmeter or approved line tester.
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This video series explains a ship's electrical system, including its generation plant, switchboards and distribution network. Electrical safety and safe working practice are stressed throughout with the significance of circuit faults and the various forms of protective switchgear.

Based on book "Practical Marine Electrical Knowledge" which covers every aspect of a ships electrical system and includes correct operation, safety, testing, UMS requirements and standards for Classification Society Surveys.
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Timeline of Program 8. Electric Propulsion & High Voltage Practice:

00:00 Video Intro
00:42 Content
00:51 Introduction
01:12 Use of electric motors for propulsion
01:30 Power on cruise ships
01:57 Central power station
02:13 Average ship requirements
02:18 Modern cruise ship requirement
02:25 High voltage power generation
02:52 High voltage operation safety procedures
3:00 Documentation to fill out
3:40 Electrical Isolation Certificate
3:55 Warning sign before starting the electrical job
4:18 Safety precautions
4:24 Circuit-breaker removal
4:40 Using high voltage test prod
5:19 Safety requirements
5:35 Circuit-breaker installing back
5:49 Completion of Electrical Isolation Certificate
6:00 HV equipment to test
6:40 HV equipment isolation test
7:06 Circuit-breaker earth
7:47 After all tests
8:29 Power generation
8:34 Woodward electronic governor
8:47 Main 6.6 kV switchboard
9:15 Type of circuit-breakers
9:25 AVR, synchronizing panel, excitation control unit
9:39 Power management system
10:17 Main use of generating power
10:23 Ship’s propulsion control
10:56 Synchrophasing of propellers
11:33 Main benefit of electric propulsion
12:03 On the non-driving end
12:22 Marine propulsion motors
12:57 Static converters
13:08 Interlocking
13:34 Propulsion step-down transformers
13:59 Converter
14:20 Thyristors
15:40 Cooling
15:57 Frequency converter types
16:11 Three-phase synchro converter
16:57 Computer
17:32 Rotor magnetic poles
17:44 Speed of rotation
18:09 Variable frequency
18:15 Torque
18:28 Direction
18:49 Stator windings
19:02 In an emergency
19:19 Field
19:35 DC field current
19:52 Exciter AC supply
20:12 At normal speed
20:25 At very low shaft speed
20:47 At low speed
20:57 Need of encoders
21:17 Use of current switching converters
21:56 Harmonics
22:10 Harmonic filters
22:24 Permit-to-Work
22:59 Firstly – Safety Notice
23:21 Releases
23:51 In the filter room
24:01 Test of capacitors
24:24 Main and auxiliary power
24:53 Special protection relays
25:13 Calibrated test equipment
25:38 Testing of vacuum interrupted circuit-breaker
26:02 Check for local hot spots
26:27 Thermal observation
26:41 Report
26:52 Conclusion
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Made by VIDEOTEL
1999 archive

#marine #electrical knowledge