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Shaft Alternators for ships operation
Some vessels may be fitted with shaft alternators from which the vessel’s main electrical supply can be generated. Officers must understand that the stopping of the prime mover engine (hence the shaft) upon which the alternator is operating, could result in the complete loss of power from all main engines and some auxiliaries.
In bad weather conditions it is advisable to change over the power generation from the shaft generator to the diesels or other source to avoid the fluctuations of prime mover shaft revolutions causing a blackout.
In vessels fitted with shaft alternators, all Officers should be aware that the action of changing from shaft alternator power to diesel alternator power (or vice-versa) can occasionally result in total loss of power.
The OOW should ensure, as far as practical, that the vessel is clear of other traffic and is down-wind, down-tide of other navigational hazards when the change of power source is made. The Engine Room will expect suitable notice for the changeover, which is to be effected in good time (at least 30 minutes) before manoeuvring is requested.
The sudden loss of power whilst the vessel is steaming full ahead may lead to consequential problems like Main engine (Diesel) cylinder liner and cover cracks etc due to cooling water disruptions.
The Officers should familiarise themselves with the configuration of the shaft generator on their vessel as there are several different types available which may or may not be paralleled with the ship’s diesel generators. The Reefer sockets may also be powered by shaft alternators in some cases.
In some engine room configurations, the shaft alternators are designed to operate berth to berth and even during the port stay. The Chief Engineer is to ensure that his staff are instructed clearly about the recommended operating procedures on each vessel.
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