Method for monitoring a protective gear
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United States of America Patent
Stats
-
Jul 30, 2002
Grant Date -
N/A
app pub date -
Oct 20, 2000
filing date -
Aug 12, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of operating a protective gear is described, in particular a remote protective gear for an electric power grid. In this method, a voltage signal is derived from the line voltage, and a current signal is derived from the line current. To guarantee reliable detection of a fault in the measurement circuit of protective gear, a voltage drop is gated with a current surge. A monitoring device provided for this purpose gates a first detection signal derived from the voltage signal for the voltage drop with a second detection signal derived from the current signal for the current surge. The monitoring function is suitable for both single-phase and multi-phase networks and permits a reliable differentiation between a network fault and a failure of the measuring circuit.
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