Patent GB-190419572-A (GB)
Title: Improvements in Means for Controlling Electric Circuit Breakers.
Filed: 1904-09-10
Granted: 1905-08-17
Abstract: 19,572. British Thomson-Houston Co., [General Electric Co.]. Sept. 10. Motors, controlling.- Relates to means for controlling an electric circuitbreaker for electricallypropelled vehicles, comprising a coil for setting and an overlaid coil for opening the circuitbreaker. As shown in Fig. 1, the contacts 1 to 16 of the motor controller C are used for controlling the motors M<1> M<2>, the motor controller C being under the control of the master-controllers C', C<2>, which are connected to the train-wires 17 to 25. The contacts 1 to 6 and 9 to 14 operate to vary the resistance in the circuit with the motors M<1>, M' respectively. The actuating-coils of the contacts 7, 8, 15, 16 operate auxiliary switches. The contacts a' to a<11> of the m a s t e r-controller are fixed, and, when the controller is in its 'off ' position, the contacts a<5>, a are in connection through the segments d<5>, d<8>. A cut-out switch is indicated at 44, and operates when the controlling-handle is released by the motorman. Its actuating- mechanism is described in Specification No. 24,807, A.D., 1901, [Abridgment Class Electricity, Regulating &c.]. The blowout coil for this cut-out is indicated at 45, and the main blow-out coil for the master-controller is shown at 46. The main cut-out switch for the motor circuit is shown at 47. The contact-arm 48 of the circuit-breaker carries a brush contact 71 and auxiliary contacts 51, 52, and is attached to the core 49 of the solenoid 50. The circuitbreaker is set by energizing the coil 50, and is held set by the normally energized coil 54, the core of which is connected to the toggle 56. The circuit-breaker will therefore be tripped whenever the circuit through the coil 54 is broken. A section through the circuit-breaker is shown in Fig. 2. It is mounted in a frame 64, the coil 50 being secured by heads 65, 66, and a core 49<a> is fixed in the top half of the coil. The movable core 49 is pivoted to the contact-arm 48 at 69, the arm itself being pivoted to the frame 64 at 70. The auxiliary contact 52 is carried by a spring finger pivoted to the arm at 72, and engages the carbon contact-block 73. The poles 74, 75 of the holding-coil 54 attract the armature 76, and hold the toggle in the position shown in Fig. 2. When the overlaid coil 59 is energized, its core attracts the armature 78, which strikes the bolt 82 pivoted to the lever arm 85. The contacts 58, 91 are thus separated, and the circuit of the coil 54 is broken, causing the arm 48 of the circuit-breaker to fall. It is reset by moving the controller to its 'off' position, closing the switch 61 momentarily and switch 60 permanently. The circuit is completed from the trolley T through the switch 60, switch 61, contacts a<8>, d<8>, d<5>, a<5>, train-wire 21. resistance 43, auxiliary switch 40, and actuating-coil 50 to the ground. The circuit of the coil 54 is completed from trolley T through the switch 60, train wire 25, coil 54, switch 58, and a resistance to the ground. The master-controllers give the usual arrangements for the motors, first putting them in series with all the resistance and then gradually cutting out resistance. The two motors are then arranged in parallel with all the resistance, which may be gradually cut out.