METHOD FOR ASCERTAINING A CURRENT FLOWING THROUGH AN ELECTRICAL CONDUCTOR

摘要

The invention relates to a method (38) for ascertaining a current (I) flowing through an electrical conductor (4) into which a measuring resistor (20) has been introduced. A first electrical voltage (U1) is sensed that drops across a first resistor (30) having a first resistance value (R1) in a first resistor arrangement (24), which is in electrical contact with the conductor (4) on one of the sides of the measuring resistor (20) and is connected to a reference-earth potential (P). A second electrical voltage (U2) is sensed that drops across a first resistor (30) having a first resistance value (R1) in a second resistor arrangement (24), which is in electrical contact with the conductor (4) on the other side of the measuring resistor (20) and is connected to the reference-earth potential (P). An electrical measured voltage (U) dropping across the measuring resistor (20) is calculated from the difference between the first and second vertical voltages (U1, U2) and is divided by the resistance value (R) of the measuring resistor (20).