Circuit arrangement for grouped fernbetaetigung circuits independent from one another in a predetermined sequence within each group by means of different frequency wechselstroeme

摘要

261,384. British Thomson-Houston Co., Ltd., (Assignees of Carter, E. F.). Nov. 10, 1925, [Convention date]. Selective distant control systems.- In a system for controlling the operation of switches group by group at will, and and for causing the operation of the switches in each group in a predetermined order as, for example, in the distant control of a rotary converter substation, the control is effected by imposing different frequencies on the line 1 all the relays of each group 3 - - 5 and 6 - - 11 being actuated through the intermediary of reeds 12, mechanically tuned to one of these frequencies and each relay being subjected to its own particular time-delay action to give the desired sequence of operation within the group. As shown, when a frequency of 25 cycles is imposed on the control lines 1, the reed 12 of the relay element 3 mechanically tuned to that frequency is set into vibration and serves to charge, from the source, 28 and through the resistance 29, a condenser 27 shunted by a resistance 30 so as to have an adjustable, time-constant. After a certain time, the voltage across the condenser becomes high enough to cause the thermionic valve 20 (to the grid of which it is connected) to pass enough current from the source 23 to operate the relay 24 and close the control contacts 25. Relays 4 and 5 operate similarly with the same frequency as relay 3 but have different time delays and relays 6 - - 11 operate with another frequency.