Patent GB-307379-A (GB)
Title: Improvements in or relating to electrical remote control systems
IPC: H02J13/00
Filed: 1927-12-06
Abstract: 307,379. Reyrolle & Co., Ltd., A., Leeson, B. H., and King, O. C. F. Dec. 6, 1927. Selective distant-control systems and apparatus; illuminated stencil indicators; tell-tale apparatus.-Relates to a remote control and indicating system in which step-by-step movements at the controlling station are produced in two parts, one when controlling apparatus is operated and the other when the device at the controlled station has completed its movement. The lower half of Fig. 1 shows the control station having a drum selector 220, shown at E Fig. 9, and driven by stepping magnets 235, 236 and connected by pilot line wires 40 .. 42 in a cable having a lead sheath 43 to the sub-station shown in the upper half of the Figure and having a similar drum selector 70 driven by stepping magnet 71. Fig. 28 shows a modified system employing three line wires and pre-selector relays. Selection of apparatus. The operation of the selector push 230 energizes one coil 235 of the stepping magnet which rotates the control station selector 220 a half-step which locks itself as will be subsequently explained and sends an impulse over wires 41, 42 to the substation polarized relay 140. Relay 140 energizes selector relay 130 which closes the circuit of the selector stepping magnet 71 which on energization steps selector 70 and closes contacts 72, 73 to apply battery 120 to line wire 40 and lead-sheath 43. At the control station when the push 230 is released battery 120 energizes coil 236 of the stepping magnet to step selector 220 a second half step. Selection of the third and later positions is obtained by further operations of the push 230. Indicating circuit. During selection the indi. cating circuit is opened at contacts 222 and on completion of the selection an indicating circuit is closed over line wires 40, 42 for the polarized relay 200 from the indicating bus bars 160, 161. In the first position " off normal " of the selector 70 the bus bars 160, 161 are connected through contacts 51, 52, 93, 94 to the substation battery 120 with polarity depending on the position of the circuit breaker 50. The polarized relay 200 energizes one or other of relays 203, 204 which control an indicating device subsequently described and lamps 285, 286. In the third position the indicating bus bars 160, 161 are associated with a thermostatic switch 60 and associated relay 62. Operation of circuit breaker. Push 240 trips and push 250 correspondingly closes the selected circuit breaker by energizing line wires 41, 42 to operate relay 140 in the opposite sense to that in which it was energized during selection so that executive relay 150 is actuated and closes a retaining contact 155 and a contact 154 in the circuits of the trip relay 180 and the close relay 185. These circuits also include contacts 54, 55 associated with the circuit breaker so that the latter if open is closed by the energization of the appropriate operating coils 57 or 58, relay 180 or 185 being meanwhile locked by contact 183 or 187. Transmission of meter readings. The desired contacts on selector 70 are selected and executive relay 150 is operated by metering push 260 which when released leaves contact 262 operated until released by movement of the selector 220 so that metering bus-bars 162, 163 are connected through contact 153 to line wires 40, 42 with which meter 266 is associated. The bus-bars 162, 163 are connected through the selector 70 to a current transformer 61. Telephone and alarm circuits. These are associated with the zero or normal contacts of the selectors. The telephone push 270 extinguishes lamp 285 and lights a lamp 264 to indicate that the system is inoperative and energizes line wires 41, 42 so that executive relay 150 is operated to complete the telephone buzzer 170 and speaking circuit 171 over the metering circuit 40, 42. Calls from the substation are effected by push 173 which is electromagnetically locked by electromagnet 176 in all, except normal, positions of the selectors. Current interrupted by interrupter 177 is thus sent over line wires 40, 42 to the control station and operates relay 200 to operate relay 203 and since the alarm position relay 290 is energized in the normal position of the selector lamp 286 is lighted and buzzer 287 is operated. An alarm is given by the automatic operation of a circuit-breaker or the operation of thermostat 60 causing the alarm relay 190 to be energized momentarily. Relay 190 locks itself until released by operation of the selector and supplies current to line wires 40, 42 in opposite direction to that of a telephone call. The operation of relay 200 thus energizes relay 203 of relay 204, depending ou whether a telephone or alarm call is sent, to change over lamps 285, 286 and operate the buzzer 287. Relays 203, 204 control separate indicator discs so that a distinguishing indication is given; moreover in the case of a telephone call interrupter 177 is in circuit so that the buzzer 287 is intermittently . operated. If an alarm is initiated when the selector is " off normal " the alarm relay 190 is energized and locked but the alarm is stored until the selectors are returned to normal. Modification of circuit-breaker operation. In a modification (Fig. 18, not shown), the trip push 240 inserts resistance in the line wires 41, 42 which control relay 140 and an additional marginal relay is arranged in series with relay 140 energized only by the stronger closing current. With this arrangement the trip relay 180 is dispensed with. Modification of alarm circuit. To enable an alarm to be given to the control station while meter readings are being taken the sub-station alarm relay 190 may be provided with extra contacts controlling an auxiliary alarm relay (Fig. 17, not shown), and its retaining circuit includes a time limit relay. With this arrangement the auxiliary alarm relay breaks the metering circuit and applies battery 120 to line wires 41, 42 to transmit the alarm. With this arrangement a metering relay controlled by executive relay 150 normally, and in the case of an alarm during metering after the time-limit relay operates, closes the metering circuit. Arrangements for express selection. To obtain express selection after the operation of contacts 232, 233, Fig. 1, if both sets of contacts are closed the re-setting movement of solenoid 236 will automatically re-energize the starting solenoid 235. These connections may be effected by a special push or by the provision of extra contacts on the push 230 which are closed by rotating the push, or alternatively, by retaining the push depressed. A barometer type pointer carrying contacts and co-operating with the selector pointer may control a relay so that the express selection is stopped when the pointers are in agreement. Automatic operation of selectors on receipt of an alarm. When self-recording indicating mechanism is employed at the control station it is necessary to arrange that the receipt of an alarm signal causes the selectors to perform a complete selecting and indicating cycle. Fig. 26 shows the modification at the control station. Relay 290 is energized in the normal position of the selector so that an alarm causes relay 204, associated with the polarized indicating relay 200 to energize an alarm relay 300 which is retained at contacts 301 and starts an express selection at contacts 302, 303 and energizes an auxiliary relay 310 which looks itself till released by the selecting push 230 or a " stop-bell " push 315 and lights lamp 286 and operates buzzer 287. The operation of the selector to the fourth position releases alarm relay 300 but the selecting circuit is maintained by contacts 313, 314 in conjunction with contacts operated by cam 323 on the selector so that the selecting and indicating cycle is completed. The control operator can check the system by energizing alarm relay 300 by an additional push, not shown. Construction of interlocking switch mechanism. The selecting, metering, telephoning, tripping and closing pushes, G, H, L10, J, K respectively are interlocked by sliding plates R, Figs. 16, 17, so that only one can be depressed at a time and plates G4, H4, L11, J4, K4 driven by the selector spindle E1 are provided to prevent the depression of the pushes except in the appropriate position of the selector and to lock, in the half-step position of the selector, all pushes except the selecting push, the plate of which is driven through a lost motion device G7, G8. In addition, all pushes are locked in position by spring catches R3, controlled by the duty switch M3, Fig. 16, and 280, Fig. 1, and the lock-out switch M8 and 211 which can only be operated when the duty switch is off and is locked and can only be re-set from behind the panel. The telephone push L10 is a dummy operated by the telephone cord L2 and a weight L3 and drum L4. A. further interlock may be provided for the trip and close pushes J, K by levers J8, K, operated by the indicator mechanism so that the close push is locked when the selected circuit-breaker is closed. Construction of selectors. At the control station the selector drum E is mounted on a spindle E1, Figs. 9, 11, 12, carrying a ratchet wheel E3 co-operating with a driving pawl N6, a ratchet wheel E4 co-operating with check pawls N9, N10, and a disc E6 co-operating with a locking bolt 0, operated by a cam N7. The pawl N6 is driven by the electromagnet N, which corresponds with coil 235, Fig. 1. An additional ratchet wheel E5 co-operates with a driving pawl Q6, operated by electromagnet Q, corresponding to coil 236, Fig. 1, from the sub-station to give the second half step movement. The sub.station selector is similarly arranged and driven except that a single electromagnet driving a full step through ratchet and pawl mechanism is provided. The contacts shown operated during the driving of the selector correspond with the contacts associated with coils 235, 236, Fig. 1. Construction of indicator. The con