Patent GB-253160-A (GB)
Title: Electric remote control and supervisory system
IPC: H02J13/00
Filed: 1925-02-04
Abstract: 253,160. Fairbrother, H., (North Electric Manufacturing Co., and Arter, R. C.). Feb. 4, 1925. Selective distant-control systems; tell-tale apparatus.-Relates to systems for supervising and controlling the operation of apparatus, such as circuit breakers at automatic power subtations, and comprises a system wherein the apparatus at any one of a number of substations may be controlled from a single office. The reading of water levels or of instruments such as current meters, synchronoscopes, &c. may also be obtained at the control office. The control office and substations are connected by four line wires having an earth or wire return. One of the lines is used for selecting apparatus units and two are used for controlling the selected unit and transmitting supervisory signals, respectively. The fourth wire is used in conjunction with the controlling and supervising lines for selecting a wanted substation. Figs. 2, 3, 4 and 5 show the apparatus at the control office, and Fig. 7 shows a " lock out " arrangement for a substation. Similar arrangements are located at the remaining substations and are used for determining which one of the stations is to be controlled or which station is to automatically take control of the lines. Figs. 8 and 9 show the impulsing and selecting equipment at an automatic power substation. The substations are disposed at successive points along the lines and each station is associated with a selecting key, such as 201, 202, or 200, Fig. 2, at the control office, which when operated causes the transmission of impulses over a line 232 to extend the lines 231, 233 from station. to station until the required station is selected and the impulsing register B, Fig. 8, is connected to the lines. The extension is then continued until the " lock-out " apparatus at the last substation on the lines is operated. The impulsing register A, Fig. 3, at the control office is then connected to the lines and the registers are operated synchronously by a train of impulses transmitted over the line 234 to select a particular relay, corresponding to the wanted station, in the group of relays 411 - - 420. The selected relay operates a switching relay, such as 124, 425, or 426 to connect the control and supervisory apparatus, Fig. 5, corresponding to the wanted station, to the impulse register, Fig. 3. At the end of this train of impulses, selecting relays 911 - - 920, Fig. 9, each of which is associated with a circuit breaker or other apparatus such as current measuring bus-bars and synchronizing bus-bars, are connected to the substation impulse register B, Fig. 8, by a relav 909. The registers are then operated by a second train of impulses transmitted over the line 234 to select any particular relay in the group of selecting relays 911 - - 920 and the corresponding relay in the group 501 - - 510 and thereby permit any desired operation, such as the opening or closing of a circuit breaker, or a meter reading to be effected over the lines 232, 233. When a unit is operated a supervisory signal of its condition is transmitted back to the control office. The number of impulses in each train is the same and the impulses are of alternate polarity to ensure reliability of selection. An earth return or a common return line 237 may be provided. The relay selecting equipment may be replaced by step-by-step switches. Selection of substation. Assuming it is desired to select substation No. 3, the associated key 203, Fig. 2, is operated to energize the relay 209 and consequently the slow-release relay 224, which connects a relav 223 to the line 232. A relay 211 is also energized to close the circuit of a relay 702, Fig. 7, at substation No. 1, over the line 231. The relay 702 connects the relay 703 to the line 232 and the relays 223, 703 are operated in series. The relay 223 operates a relay 217 which in turn actuates a relay 214 to associate the relay 207 corresponding to substation No. 1 with the line 233. Simultaneously, the relay 703 energizes a relay 705, which connects a relay 707 at this substation to the line 233. Since, however, the relay 207 is not operated, the relay 707 is not energized and the impulse register at substation No. 1 is not connected to the lines. The relay 214, upon operating, closes the circuit of a slow-release relay 225 which de-energizes the relay 224 and disconnects the relay 223 from the line 232. The circuit of the relays 223, 703 is thus opened. The relay 217 also completes the circuit of a relay 218, but the latter remains inoperative while the relay 223 is energized since a short-circuit is provided by the original energizing circuit of the relay 217. When, however, the relav 223 is de-energized, the relav 218 is energized in series with the relay 217 to open the circuit of relay 214 and disconnect the relav 207 from the line 233. Similarly, when the relay 703 at the first substation is de-energized, a relay 704 disconnects the relay 707 from the line 233 and in addition opens the circuit of the relav 703. In this manner substation No. 1 is locked clear from the lines. The relay 704, however, closes the circuit of a relay 702 in substation No. 2 and thereby connects a relav 703 at that station to the line 232. When the relay 223 at the control office is disconnected from the line 232, the relay 225 is de-energized and after an interval of time, completes the circuit of the relay 224 which energizes the relays 223, 703 in series. The relays 705, 707 at station No. 2 operate in a manner similar to the corresponding relays at station No. 1,, and the station is locked clear from the lines since the substation selecting relay 208 is not operated. The relay 704 at station No. 2 extends the line to substation No. 3 and the relay 223 is energized in series with relay 703 at this station. The relays 221, 216, 705 are energized and since the relay 209 is operated, a circuit is closed over the line 233 for the relav 707, which causes the relav 709 to connect the substation register and impulsing equipment, Fig. 8, to the lines. The relay 216 operates the relay 225 in a manner similar to that previously described to open the circuit of the line relays 223, 703. The relay 222 then opens the circuit of the relay 211 and consequently allows the relay 212 to open the circuits of the operated relays 209, 217 - - 222 and energize a relay 213 which connects the control station register, Fig. 3 to the lines. When the relay 703 is de-energized, the relay 704 disconnects the relays 703, 707 from the lines 232, 233 and grounds the line 766 to look out substation No. 4. The impulse registers at the control station and substation No. 3 are then associated with the lines 232, 233, 234. The control office register is connected to the lines only after the " lock-out " apparatus at the last station has been operated, since before the relay 213 can be operated, the relay 222 corresponding to the last station must be energized. Signalling which substation has been selected. A circuit is now established for the relays 309, Fig. 3, and 804, Fig. 8, over the lead 238, line 234, and lead 735. The relay 309 operates the relay 313 which energizes the relay 315 and the first relay 318 in the impulsing group in series. The relay 318 completes a circuit for the relay 319 but this relay remains de-energized due to the short-circuit provided bv the original energizing circuit of the relay 318. The relay 315, however, operates the relay 304 to open the line circuit and consequently allow the relay 319 to energize a relay 421, Fig. 4, and thereby connect the control office selector to the impulse register. When the relay 318 is operated, a relay 301 deenergizes the slow-release relay 303 and opens the circuit of the relay 304 to prepare the line for the next impulse. The relay 309 also energizes a relay 311 to prepare the circuit of a relay 310 which is operated when the line circuit is opened. The relay 310 energizes the relay 305 and transfers the line to the relay 306. Similarly, at the substation the line relay 804 operates relays 806, 810. The relay 810 operates the first impulsing relay 820 which (1) prepares the circuit of the next relay 821, (2), energizes the relay 902, Fig. 9, to connect the relays 905 - - 908 to the leads 851 - - 860 of the impulsing relays, and (3) operates a relay 814. The relays 813, 814, 905 - - 908 control the transference of the line to the two line relays at the substation. When the line circuit is opened by the relav 315 at the control station the relay 805 is energized in series with relay 806 to allow the relay 821 to transfer the line to the relay 807. The relay 814 operates relay 803 which completes the line circuit over the line relay 306, 807. The relay 306 operates a relay 312 which energizes the relays 314, 320 in series and the relay 807 causes the operation of the impulsing relay 822. The relay 314 operates the relay 304 and opens the line circuit to bring about the operation of the next impulsing relays 321, 823. The relav 321 operates over the lead 351 a relay 401 which connects the relay 411 to the line 232. The relay 401 operates the relay 301 to prepare the line circuit, which at the control office is again connected to the line relay 309. The relay 411, however, is not energized, since it corresponds to substation No. 1. The impulsing relay 823 operates another relay which causes the transference of the line to the line relav 804 and a further impulse is transmitted to operate the next relays in the impulse registers. These operations continue until the relay 413, corresponding to the selected substation, is energized over the line 232 and the contact of the relay 905, Fig. 9, which is operated at the third count of the impulse registers. Relays similar to the relay 905 are provided at the other substations but are operated by the impulse which corresponds in number to the station. The relay 413 illuminates the lam