Fault detection circuit and method for testing a multiple conductor cable having a shield
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Jul 27, 1992
filing date -
Nov 2, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fault detection circuit for testing conductor-to-conductor and conductor-to-ground faults in multiple conductor shielded cables. The fault detection circuit includes a voltage source that provides a plurality of distinct voltage phases. Each distinct phase from the voltage source is connected through a resistance and a logic circuit to an individual conductor in the cable. The resistance limits the current flowing through the fault detection circuit to reduce the risk of electrical shock to the operator. The logic circuit includes control relays which are responsive to phase-to-phase or phase-to-ground faults in the cable conductors. The logic circuit also provides a visual indication of a fault in the cable.
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