Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-04-01
2000-12-19
Lefkowitz, Edward
Communications: electrical
Condition responsive indicating system
Specific condition
324522, G08B 2100
Patent
active
061632651
ABSTRACT:
A voltage sensing arrangement is provided that facilitates accurately measuring a sensed voltage while also providing isolation to a sensing path during a test mode of an associated indicator arrangement. The voltage sensing arrangement includes a voltage sensor that is arranged to sense the voltage on an associated power distribution line. A first arrangement is responsive to the voltage sensor for providing an output representing the voltage on the associated power distribution line. The voltage sensing arrangement includes a second arrangement that is responsive to the voltage sensor for isolating the first arrangement from the voltage sensor whenever voltage is not present on the associated power distribution line. In a preferred embodiment, a third arrangement is provided that is responsive to the presence of voltage on the associated power distribution line for isolating a test path from the voltage sensor.
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Lapacek James V.
Lefkowitz Edward
S&C Electric Company
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