RELIABLE FAULT DETECTION AND FAULT LOCALIZATION IN A LOAD ZONE OF A DC SYSTEM

摘要

The invention relates to a load zone (1) comprising an electronic switch (2), a DC bus (3), a connection (30) for supplying the load zone (1) with electrical energy, and at least two electrical devices (4), the electronic switch (2) being arranged between the connection (30) and the DC bus (3), the electrical devices (4) each being electrically connected in parallel with the DC bus (3). To improve fault detection and fault localization in the load zone (1), a fuse (5) is arranged between the DC bus (3) and the particular electrical device (4), a voltage sensor (7) being arranged so as to detect a voltage (u_Sx) across the fuse (5). Furthermore, the invention relates to a DC system (10) having such a load zone (1) and at least one energy source (6), the energy source (6) being connected to the connection (30) of the load zone (1). The invention further relates to a method for operating such a load zone (1) or such a DC system (10), wherein a defective device of the electrical devices (4) is identified on the basis of the voltage (u_Sx) across the fuse (5) in that the voltage (u_Sx) across the fuse (5) exceeds a specifiable limit value.