Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-08-13
1981-09-22
Robinson, Thomas A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, G01R 3108, H04B 346
Patent
active
042912040
ABSTRACT:
A system for locating faults in an electric cable including a flyback transformer or inductor and control circuitry therefor for developing an arc through a high resistance short circuit between two conductors or one conductor and ground. The control circuitry limits the current flow in the arc to avoid burning or welding of the conductors but maintains the current so that the high resistance short appears temporarily as a low resistance short which can be detected. A low level DC bias current stabilizes the system, particularly in the presence of large line capacitance when the distance between the apparatus and the cable fault is large. The circuitry includes an audible tone generator which can be sensed by induction with known inductive pickup equipment. The circuit also allows use of a time domain reflectometer to determine the location of high resistance shorts from a remote location on the cable to which connections can be made.
REFERENCES:
patent: 3488580 (1970-01-01), Anderson et al.
"Locating Faults in Air Core PIC Cables", by Demick, Telephony, Feb. 11, 1974, pp. 27-29.
"Evaluation of Underground Fault Location Techniques", EPRI TD-153, Apr. 1976, Electric Power Research Institute.
"Underground Cable Fault Location", A Handbook to TD-153, EPRI EL-63, Jan. 1977, Electric Power Research Institute.
Olson Thomas H.
Robinson Thomas A.
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