Patent GB-243021-A (GB)
Title: Improvements in or relating to electric signalling and controlling systems
IPC: H02J13/00
Filed: 1925-11-14
Abstract: 243,021. Metropolitan-Vickers Electrical Co., Ltd., (Assignees of White, T. U., and Gardner, J. E.). Nov. 15, 1924, [Convention date]. Selective distant control systems and apparatus. -In a system for the distant and supervisory control of electric power substation apparatus, wherein chains of counting relays at the control office and substation actuate auxiliary relay chains which select the required apparatus units, a control key is provided at the control office for each unit and impulse transmitters for operating the apparatus units and releasing the selecting mechanism are associated with the control keys. The counting relays are operated by a pair of control relays at each station which are brought into operation by a "start" key. When the unit which is to be operated is selected, the control circuit is interrupted and a predetermined number of impulses is transmitted from the control office to effect the desired operation of the unit. When the unit is operated an impulse is transmitted to actuate supervisory signals at the control office and initiate the operation of the control circuit to bring about the subsequent operation of the remaining selecting relays in a predetermined sequence. The substation apparatus may be operated manually or automatically according to the load. Figs. 1 and 3 show the control apparatus and Figs. 4 to 7 show the apparatus at the substation. The - central station is provided with a key K<3> for preparing the operating circuit of each unit, e.g. a circuit breaker C, Fig. 4. Each key K<3> is associated with impulse senders 200, 201, 290 each adapted for transmitting a characteristic number of impulses to effect " closing " or " tripping " of the circuit breaker or the release of the - selecting mechanism respectively. The keys and their corresponding apparatus units are associated with groups of selecting relays 207 - - 216, 405 - - 414 respectively, which are energized and de-energized in succession under the control of groups of counting relays 100 - - 123, 600 - - 123 operated by pairs of line relays 313, 514 or 316, 511 adapted to be connected alternately to the line 372. The operation of the control relays is initiated by a key K<14>, Fig. 3, and upon the first operation of the relays the counting relay 600 at the substation is operated. The relay 600 transfers the line 372 to the other pair of control relays which operate to energize the counting relay 111. The relay 111 operates to open the control circuit and permit the next counting relays 110, 601 to energize simultaneously. The counting relays 612, 123 are then energized successively and the relays 123, 613 are energized simultaneously under the control of the line relays. The simultaneous operation of the relays 122, 613 operate the first selecting relays 213, 405. The counting relays are then operated in a similar sequence to energize the remaining selecting relays in each group synchronously. The particular sequence of operation of the counting relays ensures positive operation of the selecting mechanism. The apparatus units are operated over a common line 370, the characteristic impulses from one or other of the devices 200, 201 being stored by a chain of counting relays 710 - - 721 at the substation. The position of the units is signalled over a line 371 by supervisory lamps such as 226, 227, Fig. 2. The capacity of the system may be increased by providing additional groups of selecting relays at each station with switching relays adapted to connect these selecting relays to the counting relays 100 - - 123, 600 - -623. Normal condition of apparatus. When the apparatus is inoperative, a relay 301, Fig. 3, is energized in series with a relay 506, Fig. 5, over the line 370. Starting the operation of the control relays. When the " start " key K<14> is depressed, a relay 302 is energized to complete a circuit for the relay 303. This relay is not operated since it is short-circuited by the original energizing circuit of the relay 302. When, however, the key K<14> is released, this short-circuit is removed and the relay 303 is energized to open, at the armature 325, the original energizing circuit over the relays 301, 506. The relays 301, 506 are deenergized to operate the relays 306, 503 respectively and thereby complete the control circuit from the battery B, line relay 313, line 372, line relay 514 to earth. Selection of the circuit breaker C. When the relay 514 is operated, a relay 505 is energized to complete the circuit of the first counting relay 600. The relay 600 prepares the circuit of the next relay 601 and operates a relay 502 to open the control circuit at the armature 524 and the circuit of the line relays 313, 514. De-energization of the relay 313 removes the short-circuit from the relay 312 which has been prepared by the previous operation of the relay 313, and energizes the relay 317 to transfer the line 372 to the line relay 316. Similarly the de-energization of the relay 514, causes the relay 515 to operate a relav 510 and complete the control circuit over the relays 316, 511. The relay 316 operates the counting relay 111 over the lead 23 and a. relay 314. The relay 111 prepares the next counting relay 110 and operates a relay 307 to open the circuit of the control relays 316, 511. The relay 314 prepares the relay 315. When the control circuit is opened the short circuits are removed from the relay 315 and counting relay 110 and these relays are operated. The relay 110 prepares the next counting relay 123, operates the relay 127 to transfer the operating circuit to the lower relays of the counting chain, and a relay 308 which connects the unit control and signalling lines 370, 371 to the selecting group of relays 207 - - 216. The relay 315 opens the locking circuit of the relay 317 to again connect the control relay 313 to the line 372. When the control circuit is opened the relay 511 is de-energized to permit the operation of the relay 512 which removes the short-circuit from the counting relay 601 and allows it to operate. The relay 601 prepares the next counting relay 612, operates the relay 690 to transfer the operating circuit to the lower relays of the counting chain, operates the relay 500 to connect, the lines 370, 371 to lines 450, 463 and operates the relay 519, which through the relay 517 opens the locking circuit of the relay 510 and completes the control circuit over the line relays 813, 514. The relay 514, through the relay 505, energizes the counting relay 612, which prepares the next counting relay 613 and energizes the relay 502 to open the control circuit. When the relay 313 de-energizes, the relay 312 is operated and the control circuit is prepared over the relay 316 at the armature 350. The relay 514 allows the relay 515 to energize the relay 510 which completes the control circuit over the line relays 316, 511. The relay 316 operates the counting relay 123 which energizes the relay 307 to open the control circuit. The de-energization of the relays 316, 511 causes the operation of the counting relays 122, 613 respectively, and the actuation of the first selecting relays 216, 405 m each group. These selecting relays are associated with the key K<3> and the apparatus unit C. When the selecting relay 216 is operated, the circuit of a lamp 243 is prepared and the key K<3> and the appropriate supervisory signals are connected to the lines 370, 371. The lamp 243 is illuminated after an interval by a slow-acting relay 305 which is de-energized by the relay 307. The selecting relay 405 at the substation prepares the unit control and supervisory circuits and operates a relay 706 which prepares the circuit of the relay 700. The selecting mechanism is now ready for the transmittion of a characteristic code for operating the circuit breaker. Operation of circuit breaker. Assuming it is desired to close the circuit breaker, the key K<3> is set into a position which corresponds with the " closed position before the " start " key K<14> is operated. When the selecting relays 216, 405 are operated the circuit of the line relays is interrupted and the control operation is stopped. The impulse transmitter 200 is now operated to interrupt the circuit of the relay 700 twice. The circuit from the interrupter extends over the key K<3>, contacts of selecting relay 216, line 370, relay 700 to battery, and the relay 700 is energized to operate a slow-acting relay 701 which prepares the circuit of a counting relay 711. The relay 711 is energized by the first interruption of the circuit by the transmitter 200 and prepares the relay 710. Upon the subsequent energization of the relay 700, the short-circuit across the relay 710 is removed and the relay operates to prepare the next counting relay 713. The second interruption energizes the relay 713 which prepares the relay 712 and upon the second energization of the relay 700, allows the relay 712 to operate, after an interval of time due to a slow-acting relay 702, a relay 401, Fig. 4. The relay 401 energizes the closing coil 404 of the circuit breaker C. If it is desired to open the circuit breaker the transmitter 201 is operated to send four impulses into the relay 700. Four pairs of relays in the chain 710 - - 721 are then operated to energize the " tripping " coil of the circuit breaker. Signalling condition of circuit breaker. When the circuit breaker C is operated, the circuit of the closing coil 404 is opened at the switch 423, and the circuit of a slow-acting relay 400 is opened at the switch 422. The relay 400 deenergizes and completes a circuit from battery over the contacts of selecting switch 405, lead 450, line 371 to the relay 205, Fig. 2. The relay 205 attracts its armature 231 and releases the armatures 228, 229, 230 of the relay 204. The armature 228 extinguishes the lamp 227 and illuminates the lamp 226, and the armature 229 operates a slow-acting relay 206 which prepares the ci