Patent GB-209815-A (GB)
Title: Improvements in electric distant control systems
IPC: H02J13/00
Filed: 1922-10-16
Abstract: 209,815. Western Electric Co., Ltd., (Western Electric Co., Inc.).. Oct. 16, 1922. Selective distant control systems; tell-tale apparatus.-In a system for the distant control of a remote substation having several apparatus units, particularly applicable to the control of power switches at an automatic power substation, a distributor at the control station transmits code impulses to a synchronously rotating substation distributor which effects the selective operation of the power switches. Transmitting and receiving distributors are also respectively provided at the substation and the control station in order that supervisory signals at the latter may be selectively operated in accordance with the operation of the substation switches both when their operation is automatic and when it is initiated from the control station. In the arrangement described, the control station is provided with a double-throw switch 35, 35<1>, Fig. 1, corresponding to each power switch S, S', Fig. 2, at the substation. When a switch 35 is moved to the right or left to open or close a power switch, a relay 102 closes a circuit for a relay 117, over the armatures 119 - - 123 of which certain of a group of code relays 124 - - 128 are energized and connect battery to certain of the segments 140 - - 144 of the transmitting distributor 100, which transmits code impulses over the line 250 to energize intermittently the substation line relay 201, Fig. 2. The substation distributor 300 rotates synchronously with the distributor 100, each time the line relay 201 responds a circuit being closed over a segment 164, 167, 172, 173, or 174 for a code relay 165, 168 - - 171. These code relays complete a selective circuit for initiating the desired switching operation. The power switches S, S' actuate double-throw switches 45, 45<1> (similar to the switches 35, 35') which cause the illumina. tion of supervisory lamps 1000, 1001, 1000<1>, 1001<1> through selecting mechanism identical with that operated by the switches 35, 35'. Automatic operation of power switches. The brushes 15, Fig. 2, which co-operate with stationary contacts 16 connected in a main power line or auxiliary feeder, are mounted on a core 17 working within a solenoid 18 the circuit of which includes a contact 19 co-operating with the armature of a relay 28 operated from the control station, and armatures 21, 22 co-operating respectively with a front contact of an underload relay 25 and a back contact of an overload relay 26. Control from the central station is therefore only possible when the underload relay 25 is energized and the overload relay 26 is deenergized. Similarly if the underload relay 25 de-energizes or the overload relay 26 energizes, the power switch S is opened in spite of the fact that it was closed from the central station by the engagement of the contact 19. Operation when a power switch S is closed from the control station. The switch 35 is thrown to the left and the relay 102 energizes in a circuit 103, 40, 110, 111, 112 and locks up over its armature 115. Circuits are also closed at armature 114 for a relay 145 and at armature 116 for a relay 117, the circuit of the latter relay including armatures and their back contacts of relays 102<1> of all switches 35<1> nearer to the battery 103, thus preventing confusion due to the simultaneous actuation of two or more switches. The relay 117 at armatures 119 - - 122 connects certain of the code relays 124 - - 127 direct to battery 103, and at armature 123 energizes the code relay 128 over contact 40 of the switch 35. The code relays 124 - - 127 are energized in different combinations according to the particular control switch which is operated, whilst the code relay 128 is energized or not according to whether the control switches are thrown to open or close the power switches. Those code relays 124, 125, 127, 128 which respond on the energization of the relay 117 connect battery 139 to the segments 140, 141, 143, 144 of the distributor 100. The relay 145 closes a series circuit over the trunk 250 for a relay 149 and the line relay 201, the former energizing the release magnet 155 of the distributor 100, and the latter closing a circuit over the brush 162 for the release magnet 158 of the distributor 300. The holding catches 156<a>, 159 of both distributors are thereby withdrawn and the distributors rotate in synchronism. Immediately the brush 153 of the distributor 100 leaves the segment 111 the line relay 201 relapses, but it pulls up each time an impulse is sent over the line 250 when the brush 152 engages an electrified segment 140 - - 144. As the segments 174, 173, 172, 167, 164 of the other distributor 300 are positioned in similar relative positions to the segments 140 - - 144, each time the brush 152 engages an electrified segment and the line relay 201 pulls up, an impulse is transmitted from the battery 160 to a corresponding segment engaged by the brush 162, thereby energizing corresponding code relays 165, 168 - - 171, which lock up over their upper armatures. In the present instance relays 165, 168, 170, 171 prepare a circuit over conductor 194 for the relay 192, which energizes and locks up over its right-hand armature when the brush 162 bridges the segments 190, 191. The relay 192 closes a circuit for the upper winding of the controlling relay 28 which closes the contact 19 and energizes the power switch solenoid 18. At the control station, when the brush 153 arrives at the segment 206 a relay 108 is energized and locks up, opening the locking circuit of relay 102 and causing the relapse of the relays 117, 124 - - 1218. When the distributor arms 101, 301 have completed a full revolution they are again held by the catches 156a, 159, which were released on the relapse of the magnets 155, 158 when the segments 151, 163 were passed. Operation when a power switch S is opened from the control station. In this case the switch 35 is thrown to the right, relay 102 is energized over the left-hand armature of relay 108 and closes a circuit for the relay 117 which energizes certain of the code relays 124 - - 128. This time however the code relay 128 is not energized, its circuit being interrupted at contact 40 of the switch 35. The line relay 201 pulls up as described in the previous paragraph, but in addition to energizing the release magnet 158 closes a circuit for a relay 267 which breaks the holding circuits of the code relays 165, 168 - - 171 energized in the preceding controlling operation. The distributors now rotate synchronously and cause the energization of code relays at the substation, but in this case since the segment 144, Fig. 1, is not electrified the code relay 165 is not energized and a circuit is completed for a relay 205 which breaks the holding circuit of the relay 192 which relapses and transfers the energizing circuit of the relay 28 to its lower winding, thereby causing the contact 19 to be opened and the power switch solenoid 18 de-energized. At the control station when the brush 153 engages the segment 206, relay 212 is energized, and causes the release of relays 108, 117 and 102, the last mentioned relay opening the circuit of relay 212. Transmission of supervisory signals to the control station. A pair of lamps 1000, 1001, indicative of its closed and open condition is provided at the control station for each power switch S, each pair of lamps being actuated by a relay group F<1>, similar to that comprising the relays 192, 205. The power switches operate doublethrow switches such as 45, 45<1> which selectively operate the control supervisory lamps over control relay groups A<1>, B<1>, distributors 100<1>, 300', and code relay groups C', D', in a manner identical with that already described with reference to the operation of the control switches 35, 35<1>.