Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1982-03-08
1985-10-29
Schreyer, Stafford D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361106, H04B 346
Patent
active
045502234
ABSTRACT:
A test device for remotely locating faults in a two-lead line, such as a telephone subscriber loop, comprises a first dipole having terminals connected between the two line leads. The dipole comprises a capacitor series connected with a resistor for locating cut-offs in the line. A second dipole is series connected to one of the line leads, or two dipoles are series connected to the two lines for locating short-circuits in the line. The second dipole has a predetermined relatively high resistance in a low-current region and a lower resistance in a higher current region and may include a negative temperature-coefficient thermistor, or two oppositely poled diodes, or one diode, or a relay having a coil connected in series with a resistor shunted by a make contact of the relay.
REFERENCES:
patent: 2050703 (1936-08-01), Johnson
patent: 3235677 (1966-02-01), Friedrich
patent: 3636280 (1972-01-01), Wetzel
patent: 4025736 (1977-05-01), Chlupsa
patent: 4373121 (1983-02-01), Sartori et al.
patent: 4438299 (1984-03-01), Tomim
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