Improvement of the motor protection of a DC drive

摘要

The invention relates to an electrical DC power supply system for underwater and above-water vessels and for offshore installations with at least one DC source (12, 13) arranged in a respective source phase and at least one DC drive motor (2) arranged in a respective motor phase. Furthermore, the invention relates to a method for influencing a direct current flowing in a DC power supply system. In order to ensure improved protection in the event of a short circuit in an electrical DC power supply system, it is proposed to provide in each case at least one current-measuring device (14, 15) for detecting a current and/or current rise at the at least one DC source (12, 13) and at least one controller (4) for influencing a direct current flowing in the respective motor phase of the DC power supply system if the current and/or current rise detected by the at least one current-measuring device (14, 15) is greater than a predeterminable current and/or current rise.