Patent GB-190815898-A (GB)
Title: Improved Method of Indicating Faults in the Circuits of Electrical Transmission Systems.
Filed: 1908-07-27
Granted: 1909-01-21
Abstract: 15,898. Siemens Bros. & Co., [Siemens & Halske Akt.-Ges.]. July 27. Testing for and locating breaks in a system of electric distribution in which currents are supplied to a number of receiving-stations from a central distributing-station such as described in Specification No. 16,979, A.D. 1902, [Abridgment Class Philosophical instruments &c.]. Relays at the transmitting- station are inserted in the several circuits to control signalling-devices at the receiving-stations. The relays also indicate the faults at the transmitting- station. The armature of each relay controls two circuits, one indicating correct working order and the other the existence of faults in such a way that all the signalling-devices in the receiving-stations act on the occurrence of a fault in the central station, while only the particular signal belonging to the faulty circuit operates when that fault is in a receiving-station. The Figure shows an arrangement for transmitting the movements of a primary compass A to one or more secondary compasses B ... B' at a distance, as described in the aforesaid Specification. In the circuit of the heating-lamp BL and of the bolometric grating or resistance W, through which an operating current from a battery ST is distributed by leads b to moving coils D in the secondary compasses, are inserted the operating coils of the primary compass relays BR, WR. In the circuits d<1>... d<4> of the field magnets E of the secondary compasses are inserted the operating-coils of the relays ER1 ... ER4. The armature e of each relay is held up so long as the circuit to which it belongs is complete. At each of the secondary compasses are two lamps Lr, Lw, one of which Lw is supplied with current from the positive pole of the battery ST through the lead f and back through either of the leads g<1> ... g<4>, the contact h of its relay ER1 ... ER4, armature e, lead i, contact h and armature e of the relay WR, lead j, contact h and armature e of the relay BR, and lead m to the negative pole of the battery so long as all the circuits are working. Should a fault occur in one of the secondary compass magnets E or its leads, the armature e of its relay drops, the circuit of the white lamp Lw is broken at the contact h, and the circuit of the red lamp Lr is made from the lead f, through the lamp, lead k<1> ... k<4>, lower relay contact, relay armature, and lead i. Each of the lower contacts of the relays ER1 . . . ER4 is connected to a contact l beneath the armature of the relay WR, and also to a similar contact beneath the armature of the relay BR. If a fault occurs in either of the circuits a, c of the primary compass, the armature of the relay affecte d drops and opens the circuits of all the white lamps of the secondary compasses at the upper contact h, and closes the circuit of all the red lamps through the contacts l and the lead m, or through the lead and the armature of the relay BR, to the lead m. Switches U<1> ... U' serve for disconnecting the various circuits of the secondary compasses.