Patent GB-451954-A (GB)
Title: Improvements in remote control and/or indicating systems
IPC: H02J13/00
Filed: 1935-02-13
Abstract: 451,954. Electric selective signalling and remote-control systems. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, and BURNS, G. A., 32, Score Lane, Broadgreen, both in Liverpool. Feb. 13, 1935, No. 4687. [Class 40 (i)] In an electric signalling and remote-control system, the positions of the remote units are indicated by the positions of hand-set switches at the control station, the switches being associated with the banks of a rotary switch which is set in operation whenever a remote unit changes its position, the switch stopping at the position corresponding to a unit whose position does not agree with that of the hand switch and restarting when the key is moved into the correct position. Lamps, lit over a further wiper of this switch, indicate which unit has changed its position and an alarm bell and lamp are operated. Selection and operation of remote unit. The main station apparatus is indicated in Figs. 1-2 and that at the remote point in Figs. 3-4. Each circuit breaker is provided with two positions in the bank SA4, Fig. 4, for moving the breaker into " in " and " out " positions respectively. To operate a breaker the switch SLK1 is moved by hand into the appropriate position and the start key ISK is operated to close contacts ISK1 and ISK2. A duplicate selecting switch SLK2 and start key 2SK are provided, but break contacts ISK2 prevent both sets being effective together. Relays CE and CO are operated, the relay CE interacting with magnet SDM to drive wipers SD over their banks, the circuits of CE and CO being maintained over wiper SD3 when the switch is off-normal. The operation of CO extends the line circuit to contacts of reversing relay RV so that as relay CE operates, pulses are sent to polarized relays N and R at the substation. Relay N responds to the first pulses, but when wiper SD1 reaches the contact marked by ISK2 over SLK1, relay RV energizes and locks to wiper SD2 so that the direction of current flow over the line circuit is reversed and relay R responds to the remaining pulses. When the full complement has been sent, relay RV releases, but relay SS, which energized when SD2 moved off-normal, remains held. The metal rectifier MRC is so connected to prevent RV being held in parallel to SS. Relay CH operates and maintains CO. At the substation, relays IB and CL are operated and switches SA and SB are stepped by the pulses received by relays N and R respectively. Wipers SB3 and SA3 are connected together reversed so that when the full impulse train has been received and relay N re-operates a circuit is completed over SB1, SA3, SB3 and SA4 to operate the required circuit breaker control relay. Transmission of supervisory train. When the controlled unit changes its position, either as the result of a control or automatically, positive is connected to circuit 10 so that relay RSR is energized and locks. If the operation of RSR follows a control transmission, relays CH and CO are energized so that these relays fall away in turn to connect up the receiving relays I and O and at the sub-station relay N releases followed by relay IB and switches SA and SB home. Relays SE and E operate and relay SER pulls up over the control line. Relay SER energizes magnet ISDM, relay E is released, SER falls away and ISDM de-energizes to step wipers ISD and allow relay E to reenergize and this cycle is repeated, the pulses of E also energizing relay P and one of the relays I and O at the main station. As wiper ISD3 steps over its bank it encounters earth on units that are " in " and a disconnection on " out " units so that relay IRV is energized on " in " units to reverse the current flow. The rectifiers MRA, MRB are connected to relays I and O so that if the corresponding switch INK is in the appropriate position either relay I or O is energized and magnet RCM steps the wipers RC. Relay P energizes on all pulses to hold relay B energized and keep open the circuit of the faulty impulse lamp FIL. As the switch RC steps, lamps as IFL are lit to identify the unit connected with, relay CB is energized and locks and closes circuits to alarm lamp and bell ALL and ALB respectively. When the circuit of the changed unit is reached, the relative relay I or O will be shorted over the key and the other rectifier will be nonconducting so that relay SER will not respond, relay P being of too high resistance to allow SER to energize in series, and transmission will stop. When the operator moves the key INK to the correct position relay SER will re-energize in series with the relay I or O and transmission will continue. When transmission is completed relays P and B are released, the alarms are cut off by the operation of key ALR and the restoration of start key ISK releases relay SS. If the impulsing has been faulty, wiper RC4 will not be home when impulsing ceases so that the faulty impulse lamp FIL is lit. The transmission of the supervisory train can be initiated by the operation of key CK. Switches SA, SB are moved to select the last contact on SA4 which is connected to lead 10 and operates relay RSR. Relay RSR is released in the second position of wiper ISD2, but it is extended to lead 10 over other contacts of the bank so that it is re-operated and locked if a breaker should change its position during a supervisory train transmission.