Method and apparatus for monitoring live electrical equipment at high or medium voltage
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United States of America Patent
Stats
-
Oct 19, 2004
Grant Date -
Jan 24, 2002
app pub date -
Jul 11, 2001
filing date -
Jul 12, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for monitoring live electrical equipment at high or medium voltage includes a sensor unit placed on the equipment having a first radio antenna, a sensor for producing a digital signal related to a determined physical parameter at a point to be monitored, and an amplitude-modulator connected to the sensor and to the first antenna, and activated by the energy received by said antenna; a transceiver unit placed outside the equipment and having a second radio antenna for illuminating the first antenna, a power supply source, and a signal processor connected to the second antenna; and the first antenna retransmitting towards the second antenna the radio wave that has been transmitted thereby, while simultaneously amplitude-modulating it in response to the output signal of the sensor, and the processor being arranged to provide a signal related to said parameter.
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