Abstract:
A shaft generator arrangement of a ship according to the invention comprises a permanent magnet generator (1) to be arranged around a main shaft (2) of the ship, and a frequency transformer (5) arranged to transform voltage of the generator. The arrangement has also a generator breaker (7) between the generator (1) and the frequency transformer (5) through which the generator is connectable to the frequency transformer. The windings (1A) of the permanent magnet generator (1) are connected to a star point (9), and which generator comprises a star point breaker (10) between the windings (1A) and the star point (9).
Abstract:
An inventive protection arrangement is for a two-stroke internal combustion engine providing power to a generator having output lines (4A, 4B 4C) with circuit breakers (5A, 5B, 5C). The protection arrangement comprises a heat resistor bank (8A, 8B, 8C) and a circuit breaker (9A, 9B, 9C) for each output line (4A, 4B 4C). The circuit breaker (9A, 9B, 9C) is connected to the output line in a parallel manner with the circuit breaker (5A, 5B, 5C) of the same output line (4A, 4B 4C), and the resistor bank (8A, 8B, 8C) is connectable to the each output line (4A, 4B 4C) via the circuit breaker of the output line. The protection arrangement further comprises a control unit (11) having connections to the circuit breakers and the circuit breakers, in order to monitor the circuit breakers and to control the circuit breakers. In case the circuit breaker (5A, 5B, 5C) of at least one output line (4A, 4B 4C) is tripped to open, the control unit is arranged to control the circuit breakers (9A, 9B, 9C) of the output lines to connect the heat resistor bank (8A, 8B, 8C) to output lines (4A, 4B 4C).