Marine Electrical - Distribution System and Maintenance

The electrical distribution systems in ships demonstrate the sources of electrical power and the essential loads found onboard. These systems describe the selection of plants for generating electric power on vessels. Electrical maintenance helps to keep the equipment in excellent running condition, reduces downtime and increases cost savings. Generally, we follow a time-based maintenance procedure. However, we can also apply condition-based maintenance for large moving machines where periodic stoppage and dismantling may cause problems. Shipboard maintenance of electrical and electronic devices is limited to regular monitoring and basic maintenance. This entails conducting regular watchkeeping checks, investigating abnormal running conditions, and changing worn-out or defective parts per the SOP (standard operating procedure) and the manufacturer's instructions. In the case of a total failure or breakdown, you require a shipboard crew member to change a motor, starter parts, or electronic cards that control certain operations based on time sequence or logic ingrained in the circuitry. This course includes basic maintenance procedures that build your troubleshooting capability and basic maintenance skills.

It then discusses the causes of short-circuits and earth faults and the common locations of earth faults in systems. Explore the direct current wire distribution system and each section's content of the direct current switchboards. Study the main electrical power sources on ships and the main switchboard functions, maintenance of DC machines and the performance load test of a direct current generator. Learn about the rewinding of the field coil and the rewinding of the DC machine armature. We investigate the open and short circuit tests of an alternator in addition to the maintenance of alternators. You will become familiar with the load performance test on three-phase alternators and the measurement of the insulation resistance value.

The last section enables you to gain a sound understanding of high- (HV) and low-voltage (LV) distribution on board ships. We outline the dangers of working with high-voltage equipment and the risk assessments and the safety requirements of such systems. Compare the HV supply and LV supply onboard ships in addition to the emergency power distribution of vessels. We cover the methods and procedures for maintaining the induction motor and enable you to determine the slip for a three-phase squirrel cage induction motor and the brake test for a three-phase induction motor. Analyze the reconditioning of the silica in a transformer's breather and the estimation of voltage regulation and efficiency. Study the periodic maintenance of transformers, the rewinding of small transformers, and transformer oil tests. Discover how to service a universal motor and the maintenance of cables, safety procedures for busbar inspection and maintenance. Lastly, you will learn about the care of carbon brushes and other associated technology of electrical maintenance.