Patent GB-289996-A (GB)
Title: Improvements relating to electric remote control and indicating systems
IPC: H02J13/00
Filed: 1927-03-04
Abstract: 289,996. Beatty, W. E., (Electrical Research Products. Inc.). March 4, 1927. Selective distant control systems; tell-tale apparatus.-Relates to an electric supervisory control system wherein a number of apparatus units, such as circuit breakers, at a substation are selectively controlled from a control station over two line wires. The units and their corresponding operating keys are respectively associated with distributors, which are synchronously driven. Another arrangement is such that upon operation of a key, selection of the corresponding circuit breaker is effected prior to its operation by the subsequent transmission of a definite code of impulses. Distributor mechanism. Two rows of contacts 38, 39, Figs. 2 and 5, distributed around a fixed plate 36, are adapted to be operated by members 46 slidably mounted in fixed rings 41 - - 44. The slides mounted in the rings 41, 42 are operated by a shutter 29 pivoted on a rotatable disc 1, and operated through pivoted levers 30, 32 by polarized magnet 35. When the magnet is energized the shutter 29 is moved to the right or left of the disc according to the polarity of the impulse to move the middle contact into engagement with one or other of the outer contacts in the pile 38 which at that instant is positioned above the shutter 29. The contacts are held closed after operation by the disc 1, which engages a projection on the slide 46. Projections 51, 52 on the disc 1 co-operate with the slides 46 in the rings 43, 44 so as to close and open the contacts in the row of contacts 39 successively in passing. The disc 1 is mounted on a shaft 2 which is driven by a spring motor comprising a spring 4, one end of which is attached to a hollow shaft 5 free to rotate around shaft 2, and the other end is secured to an escapement wheel 6 fixed to the shaft 2. A spring 11 is adapted to oscillate a shaft 9, which through a disc 14 and lever 16 operates a pawl 8. A lever 12 normally cooperates with a cam 13 on the shaft 9 to prevent rotation of the shaft 9, 2. When the lever 12 is moved out from engagement with the cam the apparatus is released and the shaft 2 is rotated step-by-step under the control of the spring 4 and escapement mechanism 6, 8. The shaft 5 carries a wheel 18 which co-operates with a worm wheel 19 on the shaft 20 of an electric motor 21. A rod 22 on the wheel 18 passes freely through the flanges of a member 23 which co-operates with a threaded portion 24 of the shaft 2. Normally the motor 21 is stationary, but as the shaft 2 rotates the member 23 rides along the shaft and operates a switch 26 in the motor circuit when the spring 4 requires rewinding. The motor rotates the shaft 5 to wind the spring rod as the speed of the shaft 5 is made to exceed that of the shaft 2, the member 23 is returned along the shaft to open the motor circuit when the spring is fully wound even when the distributor is in operation. The lever 12 is held in engagement with the cam 13 by the shutter 29 on the disc 1, but when the magnet 35 is energized by a starting impulse the shutter moves into a notch in the lever 12, and a spring 55 raises the lever to release the cam 13 and permit rotation of the distributor. Control and supervisory arrangements, Fig. 1. In Fig. 1, the distributors are shown diagrammatically, the two rows of contacts on each distributor being designated A - - Z, B'. C<1>, D', and C. Each circuit breaker 200, 201 has a corresponding control key 100, 101 and supervisory signalling lamps 103, 104, 105. Normally when the distributors are at rest the contact groups A are closed. In each distributor the contacts A - - - Z are closed and opened successively by the projections 51, 52, Fig. 2, while the contacts B' - - - Z' are operated by the shutter 29 when impulses are received by the magnet 35. Selection of a circuit breaker. Assuming it is desired to " open " the circuit breaker 200, the key 107 is depressed to start the distributors and the circuit breaker key 100 is operated in the appropriate direction to reverse the polarity on the spring 109 of the corresponding contacts C on the distributor 102 at the central station. When the key 100 is operated, the red lamp 105 signifying the " closed position of the circuit breaker remains lighted, and a white lamp 103 is illuminated over the appropriate contacts C<1> of the distributor. Operation of the " start " key 107 energizes a locking relay 106 over the normally closed contacts A of distributor 102 to close the contacts 117 - - - 122. Closure of the contacts 118 sends a positive impulse, over parallel circuits to energize the distributor magnets 35, and thus permit the distributors to rotate. The contacts 119, 120, 121 mark the contacts B, X, Y, Z with positive, positive, zero and negative potentials respectively, and the contact 122 connects contacts C, D, &c. to line L<1> over a. common lead 131. When the distributors rotate, the contacts A at the control station are opened to prevent further control until after a complete revolution and reoperation of the key 107. When the contacts B at each station are closed, a relay 207 is energized in a local circuit from a battery 208 and a positive impulse is transmitted over the line wires L', L<2>. The relay 207 operates a relay 206 over the middle auxiliary contacts of the circuit breakers 200, 201, and the transmitted impulse operates the shutter 29 at the substation to reverse the connections of the contacts B'. When the contacts C at each station are closed, a negative impulse is transmitted over the line wires L', L<2> since the contact 109 at the control station is marked with negative potential by virtue of the position of the operating key 100. The magnet 35 of the distributor at the substation is then energized over contacts B' and the shutter 29 reverses contacts C<1>. As the distributors rotate contacts D &c. are operated, but as no change in the positions of the associated control keys has taken place no change will be made in the positions of the contacts D' &c. until the last three positions of the distributors are reached. Operation of circuit breaker. When the distributor at the control station moves past its last three positions impulses of positive, zero, negative polarity are transmitted due to the marking of the contacts X, Y, Z. The corresponding contacts X', Z<1> are thereby closed and a contact Y is opened, and a circuit for locking relay 205 is completed. The relay 205 energizes the lower winding of relay 203 over contacts C' and upper auxiliary contacts of the circuit breaker 200, and thereby opens the circuit of the solenoid of switch 200. When the last negative impulse is transmitted, a relay 108 is energized to release relay 106. Supervisory signalling. When the circuit breaker opens, the lower auxiliary contacts reverse the marking of contacts C of the distributor at the substation. Upon operation of the relay 205 the relay 206 is released so as to produce when the distributor 202 reaches the stopping position a positive impulse from the battery 208 to again start the distributors. When the contacts B at the control station are closed a negative impulse (due to the retraction of contact 119) is transmitted over the line wires to restore the contacts B<1>. Simultaneously contacts B of the distributor. 202 energizes relay 207, which deenergizes relay 205 and operates relay 206. When contacts C of the distributor 202 are closed a negative impulse is transmitted due to the marking of the circuit breaker 200 and the contacts C' at the control station are reversed. This operation extinguishes the supervisory lamps 103, 105 and illuminates the lamp 104. The distributors continue to rotate, and when the contacts X, Y, Z at the control station which are now marked negative, positive, zero respectively, are operated, corresponding impulses are sent to the substation to return the contacts X<1>, Y<1>, Z<1> of distributor 202 to the original positions. Signalling automatic operation of circuit breaker. If due to abnormal conditions the switch 238 is automatically opened to allow the release of circuit breaker 200, the middle auxiliary contacts of the breaker momentarily de-energize the relay 206 which transmits an impulse to start the distributors. The lower auxiliary contacts appropriately mark the contact C in order to operate the contacts C' at the control station and light both lamps 103, 104. The key 100 is operated to extinguish the lamp 103 and assume a position corresponding to that of the circuit breaker, and the key 104 is depressed to cause the distributors to set the control apparatus at the substation into a position corresponding to the circuit breaker. Checking indications. A key 127 may be operated to cause one revolution of the distributors, during which the positions of all the circuit breakers are checked.