Patent GB-362495-A (GB)
Title: Improvements in or relating to remote control systems
IPC: H02J13/00
Filed: 1930-09-02
Abstract: 362,495. Electric signalling and remote control systems. AUTOMATIC TELEPHONE MANUFACTURING CO., Ltd., Strowger Works, BURNS, G. A., 4, Lucas Estate, Thomas Lane, Knotty Ash, and GUNNING, P. F., 10, Fairfield Street, Fairfield, all in Liverpool. Sept. 2,1930, No. 26237. [Class 40 (i).] In a signalling and remote control system one of a number of substations, connected in parallel along a single four-wire circuit, and apparatus at that substation is selected by reversed pulses in two successive cycles of impulses, each cycle consisting of a fixed number of impulses. The selected apparatus is operated by increasing the strength of the current flow, the operation performed depending on the direction of the flow. Circuit breaker movements are signalled back automatically to the central station, two cycles of impulses being used as for control purposes, pulses of varying polarity identifying the station, the apparatus at the station and the operation performed. Meter readings may be obtained from any substation and telephone facilities are provided. The central station attendant can check the position of all apparatus at any or all the substations and fuse faults are automatically signalled. As described, one pair of the wires provided is used for conditioning the apparatus and the other for selecting, controlling and signalling operations. Selection of sub-station. The diagrams, which should be arranged as shown in Fig. 15, show the control station equipment in Figs. 1 to 4 and 7 to 10 and the equipment at one substation (No. 3) in Figs. 5 and 6 and 11 to 13. To operate breaker No. 7 at substation No. 3, key SLK7 (not shown), which is situated between SLK1, SLK24, Fig. 1, corresponding to substation 3 is moved up into the " in " position. All keys are similarly wired. At the left-hand springs positive potential is transferred from the relative station terminal in 1a of CSS to the home terminal; in the case considered the potential is removed from the 4th bank terminal, corresponding to substation 3. CSM operates and steps wipers 1a .. 7a until the terminal from which earth has been removed, is reached, whereupon HR, TE, and KR pull up from earth on 5a. HR opens the homing circuits of the control circuits shown in Fig. 2, TE disconnects the telephone equipment which is connected to 13, 14, Fig. 4, and KR connects battery to conductors c and d, to operate polarized relay GN, Fig. 5, at all substations, operates relay E, Fig. 3, and prepares the impulsing circuit over a and b. At all substations the operation of GN causes G and TS, Fig. 12, to energize in parallel. TS cuts off the telephone which is connected over 17, 18 and connects the polarized responding relays 1A, and 1B to leads a and b. G opens the homing circuits of switches shown in Figs. 12 and 13. Relay E, Fig. 3, on operation completes circuits for F and for the driving magnet FCSM of the full complement sending switch FCSS (wiper 4a, 19). Relay F opens the circuit of E and completes a circuit for magnet BS17 of the breaker selecting switch BSS (wiper 6a, 20) and also for magnet SSM of the substation selecting switch SSS (wiper 3a, 21). Relays E and F interact, stepping switches BSS, SSS, and FCSS, and as E pulses, the circuit over a, b is completed to energize the polarized relays 1A at all substations. The operation of 1A energizes AA which relay repeats the pulses to magnet SRM of the substation responding switch and to magnet FCRM of the full complement responding switch FCRS. Slow relay IF is held by the pulses. When wipers 2b and If reach the bank commoning D pulls up, to open the circuit of 8C and to operate K. As SSS and BSS commence hunting simultaneously the bank wiring is such that the groups are hunted over in cascade. Contacts are also marked in bank 3b of FCSS. In the case under consideration when all the switches have made three steps wiper 3b finds a marked contact and C energizes over 24 and reverses the polarity of the pulse over a, b to energize IB. At substation 3, wiper 3e is on a contact which is not commoned to negative and consequently 1C operates and locks, transferring the impulsing circuit from SRM to BRM of BRS and over the 1st bank contacts of Ig and 1h to BCM of BCS. BRS and BCM step one step. At all other substations contact 4 of 3e is commoned to 1H and this relay operates, and locks, instead of 1C. 1E pulls up, locks in a circuit dependent on G, and opens the impulsing circuit. The apparatus at unwanted substations remains in this condition until the control operation has been completed and the selected substation initiates a signal back train. GR then releases, G falls away, E de-energizes and the off-normal switches restore. Selection and operation of circuit breaker.-GA pulls up when C energized to open the circuit of SSM and prepare a circuit for GB. Relays E and F continue to interact and on the next step C releases, restoring the original polarity to the control leads a and b and allowing GA and GB to pull up in series. At the selected substation, since 1C is operated, BRM responds to the impulse train. When 3b of FCSS reaches the contact corresponding to the operated key, C again operates to again reverse the polarity in the control leads. 1B energizes and 1D pulls up over 3e and 2c, the latter wiper having now encountered the commoning which extends over all but the first eleven contacts of its bank, which are reserved for station selection. The impulsing circuit is thus transferred from BRM to BCM. At the control station HA pulls up and locks, opening the circuit of BSM. E and F continue to interact, stepping FCSS only at the control station and BSC and FCRS at the selected substation. When FCSS reaches its home position, D releases and interaction between E and F ceases. Relay XC operates and Y pulls up followed by Z. XC opens the circuit to the substation. Relays XC and Y release slowly in succession and the circuit to the substation is open for this period. During the interaction of E and F, fifty impulses were transmitted to the substation of which fortyeight operated 1A and two energized 1B. When the circuit is opened for the prolonged period 1F falls away and 1E operates. When BSS at the control station stopped on the selected position a circuit was completed over the operated key in the " in " position and wiper 3f for I, Fig. 3. Had the key been in the " out " position, O would have energized over 4f. Relay 1E at the substation completes the a, b loop over 2e, 4g, 2h, and 3c in series with M, and when Y and XC have restored, a series circuit is completed over the loop for H, Fig. 4, which pulls up and, over wipers 2a and 2d, illuminates the lamp SPL, Fig. 1, corresponding to the selected key. Relay 1B at the substation also energizes to prepare a circuit over 3g for the selected IIR relay, Fig. 13. The operator depresses OPB, Fig. 4, which shorts IH and allows M to energize, completing the circuit of the selected IIR relay which changes over the selected circuit-breaker. Signalling operation of circuit-breaker. Each circuit breaker is provided with a set of springs cbc, Fig. 6, which operates one of a pair of latching relays as 1L, 1UL, the relay L being energized when the breaker moves to the " out position and UL when the relative breaker moves " in." CS operates in series with the operated relay, completing a circuit over conductor 29 and wiper 2j, Fig. 11, for RSR. RSR locks up and operates SC and U in parallel. Relay SC locks and connects potential to the c and d leads to energize LOX, Fig. 4, at the control station and KN at all other substations to prevent these stations from sending whilst the checking signal is in progress. GN releases at all substations and G falls away, completing homing circuits for those switches SRS, BRS, BCS and FCRS that are off-normal. Relay LOX completes an operating circuit for LO which prepares the circuit for either OK or faulty sending relay FS, opens the circuit of GH and releases KR to reconnect the impulse receiving relays A and B to the a and b leads. At the substation relays U and V interact driving PSS around the bank contacts and the driving impulses are repeated over the line circuit, relay A repeating the impulses to AX, Fig. 3, which drives CPRS in synchronism with PSS. The first ten contacts of the bank wiped by 3j are reserved for station identification, the substation terminal and the 10th contact being marked with positive potential, and the next twentyfour contacts are connected to contacts of the circuit breaker L relays, these terminals being connected to positive if the L relays are energized. When 3j reaches the first marked contact (the 4th in the case under consideration), RV pulls up reversing the polarity over the a and b leads so that B responds to the next pulse and BX pulls up. Magnet PRM of the position responding switch PRS, one of which is provided for each substation, responds to the pulse over 4l and CO pulls up, transferring the pulsing circuit from CPRM to PRM. PRM steps with the succeeding pulses and when 3j reaches the 10th terminal, RV again pulls up and a second reversed pulse is connected to the line to again operate B. BX pulls up and if the full complement of ten impulses has been received OK pulls up over 3l and 3k and locks. If the full complement has not been received FS and OK are connected in series over 21, 2k, 3k, 3l and in this circuit FS only responds to set in operation the automatic check switch ACS, the function of which will be described later. Assuming OK operates, a circuit is prepared to operate the latching relays, one set of which is shown in Fig. 8, which correspond with the latching relays at the remote station. Relays U and V continue to interact and either relay B or relay A responds depending on whether 3j encounters positive potential or not. If A pulls up PRS steps and the latching relay L, if back, pulls up to transfer the signal from the green " out " lamp GOL to the red "