Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-04-02
1985-01-01
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3108
Patent
active
044917821
ABSTRACT:
Apparatus for detecting and locating a fault in an electric cable or cable installation using a pulse-echo or impulse current technique comprises a low voltage pulse generator for injecting a series of pulses into a cable or cable installation; a digital store and memory for recording a predetermined number of pulses and for digitizing and storing the waveforms obtained under two different conditions of the cable; means for terminating the recording of pulses a predetermined time after a fault condition is detected; and means for retrieving the signals obtained under the two separate conditions, comparing them and thus locating the position of the fault.
REFERENCES:
patent: 2628267 (1953-02-01), Stringfield et al.
patent: 3244975 (1966-04-01), Bauer
patent: 3781665 (1973-12-01), Gale
patent: 4151459 (1979-04-01), Fayolle et al.
Bellis Edward J.
Gale Philip F.
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