CURRENT DETECTION DEVICE FOR LOCATING A RESISTIVE LOOP OR NOT IN A TWO-WIRE LINE OR FOR SWITCHING TWO TWO-WIRE LINES

摘要

P TO LOCATE A RESISTIVE LOOP, THE DEVICE INCLUDES A DIPLE D IN SERIES ON A WIRE F OF THE LINE OF WHICH THE OHMIC VALUE IS CONSTANT IN A RANGE AT LOW CURRENT LOWER THAN A PREDETERMINED CURRENT VALUE AND GROWS AT A HIGHER VALUE HIGH IN A RANGE WITH A CURRENT HIGHER THAN THE VALUE OF THE PREDETERMINED CURRENT. THE DIPOLE INCLUDES IN SERIES ON THE LINE WIRE THE COIL 12 OF A RELAY AND A REST CONTACT 13 CONTROLLED BY THE RELAY, AND A RESISTANCE 14 IN PARALLEL WITH THE CONTACT 13. WHEN THE RELAY IS POLARIZED, THE DEVICE MAY INCLUDE A SECOND IDENTICAL DIPOLE AND HEAD-SPOKE TO THE OTHER OR INCLUDING ANOTHER IDENTICAL DEVICE IN SERIES ON THE OTHER LINE WIRE. FOR THE SELECTION OF TWO LOADS OF THE LINE OR THE SWITCHING OF TWO REMOTE CONTROLLED LINES, THE DEVICE INCLUDES A BISTABLE RELAY, IN PARALLEL WITH TERMINALS 10, 11 OF THE DEVICE, WHICH CONTROLS SWITCHES. /P