Test device for locating faults in a two-lead line

Details Test device for locating faults in a two-lead line Test device for locating faults in a two-lead line

H - Electricity

04

M

379/2, 324/58

H04M 3/08 (2006.01) G01R 31/08 (2006.01) H04M 3/30 (2006.01)

Patent

CA 1191640

ABSTRACT OF THE DISCLOSURE The device is intended for the remote location of faults in a two-wire line, such a telephone subscriber loop after the detection faults by means of a test and measur- ing apparatus at a remote end of the line. The device can comprise a first dipole that comprises between the two line wires a capacitor in series-connection with a resistor for locating breaks in the line. It can also comprise a se- cond dipole inserted in series-connection in one of the line wires, or two similar second dipoles inserted in series- connection in the two line wires for locating short-circuits in the line. A second dipole has a predetermined resistance in a low-current region and a resistance lower than the prede- termined one in a higher current region. A second dipole may include a negative temperature-coefficient thermistor, or two oppositely poled diodes, or one diode, or a relay whose operate coil is connected in series with a parallel- combination formed by a resistor in parallel with a make contact controlled by the relay.

398049

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