Patent GB-390823-A (GB)
Title: Improvements in or relating to remote control systems
IPC: H02J13/00
Filed: 1931-10-09
Abstract: 390,823. Distant - control systems. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, BURNS, G. A., 46, Onslow Road, and GUNNING, P. F., 10, Fairfield Street, both in Fairfield, both in Liverpool. Oct. 9, 1931, No. 28142. [Class 40 (i).] In distant-control systems for selectively operating circuit-breakers to connect electric generators to a supply system, a signal is transmitted to the control station subsequent to the selection of a contact-breaker but prior to its operation to indicate that the corresponding generator in in phase with the system. The control station comprises a switch SSW stepping over banks le, 2e during successive halves of a revolution, the banks being marked by keys such as 1, 10 corresponding to contact breakers, bank 1e being marked for a contact breaker already closed and 2e for one it is desired to close. During the first half revolution, relay E repeats impulses over the signaling circuit (the lower . two-wire circuit) to step switch A at the substation until SSW (le) arrives at the marked contact when, as the result of an impulse of reversed polarity, the remainder of the impulses during the half revolution step switch B to a complementary position. During the next half-revolution, switches C, D are similarly set under the control of SSW (2e). The impulsing is checked over banks of switches A .. D and, if correct, the generators corresponding to the two contactbreakers are connected to a synchronoscope. When the generator to be switched in is in synchronism, a signal is sent back over the signalling line and the attendant operates the "close " key which energizes a polarized relay to operate the selected close relay over a bank of C. A contact-breaker is similarly tripped by a relay operated over a further bank of C. Selection of circuit-breakers. It is assumed that circuit-breaker 10 is to be selected and the synchronism of its generator is to be checked against that of circuit-breaker 1 already connected to the system. Keys 1, 10 are thrown up and down respectively to disconnect corresponding contacts in banks le, 2e of switch SSW and operate relay E in series with SSM which remains inert in this circuit. Relay CO also pulls up to connect battery of the required polarity to the signalling line. Relay E and magnet SSM interact to step the switch and E sends impulses over the line, K pulls up at the first step to open the original circuit of E and CO, which are now operated over the switch wipers. At the sub-station polarized relay N repeats the impulses to switch A, relay SL being operated during the train. When SSW (le) encounters the terminal marked by key 1, CO falls back so that the next impulse is of reversed polarity and operates R at the substation, whereupon this impulse is transmitted to switch B and the remaining impulses (of normal polarity) during the first half revolution of SSW are also repeated to B over wiper 2b. The last terminal of wiper le of SSW is disconnected so that impulse polarity is again reversed to transfer impulsing from switch B to switch C which takes impulses of normal polarity during the next half revolution of SSW until SSW (2e) encounters the terminal marked by key 10, whereupon impulsing is transferred to switch D which takes the remaining impulses. Relay E falls back and impulses cease .when wiper 4e of SSW leaves the commoning since K remains held. Checking impulse reception. At the substation, switches A and B should have been stepped to complementary positions and similarly C and D also, so that if impulse reception is correct, CH pulls up over wipers 1 of these switches when SL relapses, and " non-synchronized " lamp NSL at the control station is lit. Signalling synchronism of generators. Relay CH operates selected relays 1M, 1ON which connect transformers POT1, POT10, associated with the respective generators, to opposite sides of synchroscope SNR and when the generators come into synchronism, RV pulls up and connects battery of the required polarity to the control station to operate polarized relay S which lights " synchronized " lamp SL. Operation of circuit breaker. The control attendant now throws the " close key to operate polarized relay CL at the sub-station which operates the selected closing relay CIR (10). If it is desired to open a circuit breaker, the attendant throws the " trip " key to operate TR which energizes the selected trip relay TIR.