System for detecting the extraordinary approach of objects having earth potential toward a power transmission line
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United States of America Patent
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Sep 22, 1992
Issued Date -
N/A
app pub date -
Jul 30, 1991
filing date -
Sep 27, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A detector for detecting an extraordinary approach of objects having earth potential toward a power transmission line comprises a charging current detection circuit for measuring variations in a charging flowing from the power transmission line into a stray capacitance formed between a detector casing and the earth and a transmitter for sending the value measured by the charging current detection circuit to a receiver installed outside the detector casing by wireless means or a wire. The detector is always able to monitor the extraordinary approach of objects such as trees toward the power transmission line, thereby preventing in advance the accidental grounding of the line.
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