GB332418A - Improvements in and relating to electric ship propulsion systems - Google Patents

Abstract

332,418. British Thomson-Houston Co., Ltd., and Watson, G. O. July 6, 1929. Dynamos and motors combined for transmitting power.-In a ship propulsion system employing a number of motors which may be driven each from a separate generator or all from a single generator, and having switch interlocks preventing paralleling of the generators, each switch operating member 10 - - 12 has a notched sector 19 - - 21 co-operating with a locking segment 31 - - 33 and the locking segments are fixed upon a common shaft 23. In a system having two motors and two generators, with an isolating switch between each motor and its generator, and a tie switch between the motors, the arrangement prevents the tie switch being closed when both isolating switches are closed, or the closing of a second isolating switch when a tie switch and one isolating switch are closed. The three switches are in cubicles, and the shaft 23 is provided with further locks 34, 35 co-operating with the keys 36, 37 of the cubicle locks, so that the switches cannot be operated until the cubicles have been closed. To prevent a change in circuit connections unless the field and reversing levers are in their off positions, a shaft 22, with interlocking segments 24 - - 26 engaging the sections 19 - - 21, is provided with a lock 27 co-operating with a key 29 of locking mechanism shown in Fig. 6. The field control lever, which may also control the loading of the governor over a portion of its stroke, is connected to a bar 58, a slow speed lever is connected to a bar 59, and the reversing lever to a bar 60. Notches in these bars co-operate with projections on transverse locking bars 61, 62, 67. The field control lever therefore cannot be operated unless the reversing lever is definitely ahead or reverse, and the latter lever cannot be moved until the former is in its minimum position. The slow speed lever cannot be moved unless the field control lever is in position giving minimum speed setting of the governor, and the latter lever cannot be moved to increase speed unless the former is in its maximum speed position. The member 67 carries a notch 70, co-operating with a Castell lock 69 operated by the key 29, so that that key can only be removed from the lock when this is engaged, that is to say when the member 67 is in a position locking the field lever in its minimum position and the reversing lever in its off position.