SHAFT DRIVEN GENERATOR ARRANGEMENT

The a.c. shaft generator is a synchronous machine which produces alternating current with a frequency that is dictated by variations in engine speed. At the full rated...

MOTOR STARTING METHOD

Star Delta Starter This is means of reducing starting current of induction motor by initially connecting to the stator winding to ‘STAR’. Once the...

SHORE ELECTRICAL SUPPLY

A shore supply is required so that the ships generators and their prime movers can be shut down for major overhaul during a dry dock period.

BRUSHLESS ALTERNATOR

In this machine slip-rings and brushes are eliminated and excitation is provided not by conventional direct current exciter but by a small alternator. The a.c. exciter has the...

ELECTRIC PROPULSION

An electric propulsion system for a ship is often simply described as a diesel electric or turbo electric system. It is characterised only by the type of...

AUTOMATIC VOLTAGE REGULATOR

Sudden load current surges (eg. Due to motor starting) on a generator causes a corresponding change in its output voltage. This is due to an internal voltage drop...

SHAFT EARTHING

When steel is immersed in sea water (e.g. a ships hull) small galvanic current are initiated at anodic areas of the metal surface, causing corrosion.

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