Protecting an electric motor basically involves preventing the motor from getting too hot. Remember, every 10*C above the maximum recommended temperature of the insulation can redu... Read more
The standard cage-rotor a.c. induction motor operates as an almost constant speed drive over its load range. This feature is satisfactory for most of the ship’s auxiliary ser... Read more
When motor direct-on-line started with the stator winding star connected, it will only take one-third of the starting current that it would take if the windings were delta connecte... Read more
When the 3-phase a.c. supply voltages are connected to the three stator phase windings, the resulting phase currents produce a multi-pole magnetic flux. This flux is physically rot... Read more
Ship’s Motor Enclosures Enclosure protection for electrical equipment is defined in terms of its opposition to the ingress of solid particles and liquids. The enclosure protection... Read more
The induction motor has two main components, the stator and the rotor. The stator carries three separate insulated phase windings which are spaced 120 degree (electrical) apart and... Read more
LV generator circuit-breakers and other large distribution circuit-breakers (600-6000 A) on board ship are traditionally of the air break type called ACB (air circuit breaker). Thi... Read more
The central section of the main switchboard is used for the control of the main generators. The switchgear cubicles on either side of the generator panels are used for essential se... Read more
Regular inspection and the correct maintenance of generators and their associated control gear is essential to prevent failure and inefficient operation. Always ensure that the gen... Read more
Apart from direct temperature measurement of the stator windings and the internal air, the protection of a generator is largely based on the sensing of current and voltage from CTs... Read more
