System for measuring phase currents in a 3-phase installation
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United States of America Patent
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Jun 12, 1990
Grant Date -
N/A
app pub date -
Jul 18, 1989
filing date -
Jul 26, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a system using Rogowski coils to measure the phase currents in a three-phase installation. Each coil (1, 2, 3) is connected firstly to a corresponding operational amplifier (10, 20, 30) connected as an integrator, and secondly to a corresponding inverter (100, 200, 300) whose output is connected to the inputs of the integrating amplifiers of the other two phases. With appropriately selected resistance values, mutual interference effects may be cancelled. The system is suitable for measuring phase currents in an installation housed in a cabinet or cubicle.
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