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Practical Marine Electrical Knowledge: Program 1. Ships Electrical Systems - Safety & Maintenance
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Practical Marine Electrical Knowledge: Program 1. Ships Electrical Systems - Safety & Maintenance

Introduction to Marine Electrical Systems

Overview of Program One

  • This program is the first in a series on practical marine electrical knowledge, focusing on a typical 440 volt AC marine electrical system.
  • It covers essential topics such as first aid rescue procedures, test instruments, and preventive maintenance.

Importance of Familiarity with Electrical Components

  • Understanding the layout of the main switchboard and emergency switchboard is crucial for effective troubleshooting during blackouts or major breakdowns.

Electrical Safety Protocols

Golden Rule of Electrical Safety

  • Before working on any electrical installation, always isolate the circuit by removing supply fuses or locking circuit breakers in the open position. Post warning signs to alert others.
  • Proving that a circuit is dead using a voltmeter or approved line tester is essential; all alternators must be stopped and locked off before considering it safe.

Compliance with International Standards

  • All ship electrical systems must meet international safety standards as per the International Convention for Safety of Life at Sea (SOLAS) 1974 and its amendments.
  • Practical guidance for installations and maintenance comes from rules issued by the International Electrotechnical Commission (IEC).

Components of Marine Electrical Systems

Key Components Identified

  • Main components include AC generators (alternators), switchboards, busbars, circuit breakers, switches, fuses, transformers, motors, and various measuring instruments like voltmeters and ammeters.

Power Supply Dynamics

  • Generated power typically comes from one or more main alternators along with auxiliary or standby alternators based on vessel needs; emergency diesel alternators provide backup power when needed.

Distribution System Essentials

Main Switchboard Functionality

  • The main switchboard connects generated power via alternator circuit breakers to busbars; it includes panels for each alternator with controls for auto/manual synchronizing.

Emergency Power Supply Mechanisms

  • The emergency switchboard operates independently during mains failure; it supplies critical services including firefighting pumps and navigation aids through an automatically starting emergency alternator.

Safety Procedures in Electric Shock Situations

Rescue Protocol Steps

  • In case of electric shock: isolate supply if possible, remove victim from contact safely while ensuring rescuer's safety; check pupils' response to assess consciousness level. Perform external cardiac massage if necessary until help arrives.

Test Instruments Utilization

Types of Test Instruments

  • Commonly used test instruments include multimeters (analog/digital), insulation resistance testers, and line testers which are vital for fault finding in electrical systems onboard ships.

Multimeter Setup Procedures

  • Analog multimeters require setting dials correctly for AC/DC current measurement; digital multimeters display values numerically instead of using pointers on scales. Proper setup ensures accurate readings during tests.

Preventive Maintenance Strategies

Importance of Condition Monitoring

  • Regular condition monitoring helps prevent costly breakdown due to wear and tear caused by environmental factors like temperature changes and humidity levels affecting ship's electrical systems over time.

Maintenance Planning Approaches

  • Preventive maintenance can be guided by insulation resistance trends or vibration monitoring results recorded meticulously to address issues before they escalate into serious problems requiring extensive repairs.
Playlists: Practical Marine Electrical Knowledge
Video description

This is Program 1 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. Program 1 introduces a typical 440V AC Marine Electrical System, first aid rescue procedures and test instruments. It also discusses preventive maintenance. There are many system variations around. So, it's most important that you become familiar with components of the main switchboard immediately you join a ship. Pay particular attention to the layout of emergency switchboard. This study will pay dividends during a blackout or when troubleshooting because of major breakdown. Ships Electrical Systems - Safety and Maintenance The 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, the circuit can not 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. ______________________________ This video series explains a ship's electrical system, including its generation plant, switchboards and distribution network. Electrical safety and safe working practice is 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 systems and includes correct operation, safety, testing, UMS requirements and standards for Classification Society Surveys. Download the book: https://seatracker.ru/viewtopic.php?t=35313 ______________________________ Timeline of Program 1. Ships Electrical Systems - Safety and Maintenance: 0:53 Get familiar with main components when you joined the ship 1:17 Electrical Safety Golden Rule 2:02 International Safety Standards 2:50 Typical Marine Electrical System 3:10 Main components 4:18 Main and auxiliary alternators 4:45 Emergency diesel alternator 5:01 Shore power supply 5:33 Emergency batteries 6:09 Distribution system 6:20 Main switchboard 7:44 Group starters 7:54 Bank of transformers 8:08 24V DC supply - transformer rectifying system 8:15 Emergency power 8:40 Battery charger 8:46 Emergency switchboard 8:56 When the main power fails 9:55 Distribution panels 10:16 Safety. Electricity is dangerous 10:27 Safety Regulations and Procedures 10:33 Essential Rescue Methods relating to electric shock 13:10 Test instruments 14:17 Analog multi-meter 17:17 Digital multi-meter 18:15 Insulation resistance tester 19:20 Line tester 19:53 The electrical plant 20:18 Preventive maintenance 20:25 Electrical Superintendents favors 20:29 Insulation resistance trends and vibration monitoring 20:59 Electrical Permit-to-Work 21:12 Conclusion ______________________________________ Made by VIDEOTEL 1992 Archive #marine #electrical knowledge Quality: 480p