Method and apparatus for detecting current unbalance in three-phase systems

The invention relates to a device (10) for detecting current unbalance in three-phase systems (L1, L2, L3). This device (10) has a first current measuring means (S1) for measuring a first phase (L1) and a second current measuring means (S3) for measuring a second phase (L3). The apparatus further comprises an arithmetic unit (ALU), which first from the measured phase and the measured second phase a current balance value (N Furthermore, the invention also relates to a method for detecting current unbalance in three-phase systems. This method comprises the measuring (100) a current of a first phase, and measuring (200) a stream of a second phase. The method further comprises relative to the first or second phase from the measured first phase and the second phase measured at the step of determining (300) a current balance value of the third phase.