By H D MCGEORGE

Caters for marine engineer applicants for division of shipping Certification as Marine Engineer category One and sophistication . It covers some of the goods of ships electric gear and explains working principles.

David McGeorge is a former lecturer in Marine Engineering on the collage of Maritime experiences, Warsash, Southampton. he's the writer of normal Engineering Knowledge.

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After manufacture, the coils are mounted between flanges of hard insulating board on the micanite insulated poles. 10). m. it requires six pairs of poles. ) Frequency,/, is in cycles per second or hertz (Hz), so the figure is multiplied by 60 to make it cycles per minute in the calculation. The laminated poles of multi-pole machines are riveted and strengthened for bolting to the rotor hub by a mild steel bar inserted in the steel laminations. The coils are of insulated copper strip wound on mica-insulated spools of galvanised steel.

1). Magnitude of the induced voltage depends on the strength of the magneticfield,rate of cutting and length of the conductor. c. 2). Mutual cutting between conductors and magneticfieldsis produced by rotating poles, the magneticfieldsof which move through fixed conductors. The rotor shown has a pair of poles so that output is generated simultaneously in two conductors. Reference to the Fleming Right Hand Rule will confirm the instantaneous direction of conventional current indicated by the arrows.

Core i o 1 <<< << < <<< | << << < t 1 voltage coil | 1 —-| — — i o »» *» >» > > 9 trip contacts! 4 Reverse power relay Under-voltage protection Closure by mistake of an alternator breaker when the machine is dead is prevented by an under-voltage trip. This protective measure is fitted when alternators are arranged for parallel operation. Instantaneous operation of the trip is necessary to prevent closure of the breaker. However, an under-voltage trip also gives protection against loss of voltage while the machine is connected to the switchboard.

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