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    • 1. 发明申请
    • METHOD AND DEVICE FOR DETECTING GROUND FAULTS IN A SUPPLY CABLE
    • 用于接地电源线的方法和装置
    • WO2007090791A2
    • 2007-08-16
    • PCT/EP2007051012
    • 2007-02-02
    • SIEMENS AGHOFFMANN REINHARD
    • HOFFMANN REINHARD
    • G01R31/02
    • G01R31/025
    • The invention relates to a method for detecting a ground fault of a multi-strand energy supply cable (3) carrrying alternative current. The method consists in determining an average potential of the energy supply cable, entering the average potential or a variable derived from said average potential into an evaluation unit (7) and comparing the average potential or the variable derived form the average potential with a threshold value by means of said evaluation unit (7). The aim of the invention is to provide a method allowing the detection of grounding faults in a reliable and less expensive manner. To achieve this, the method is designed in such a way that a grounding fault is indicated once the value falls below the threshold.
    • 到用于从所述中间电位导出的值或中心电位甚至评估单元确定多股交替通电电源电缆(3)的接地故障,其中,确定所述电源电缆的中间电位,其中一个方法(7)被供给到评估单元(7),该中心电位或 当比较从中心电位导出的量值与可靠且便宜地检测接地故障的阈值时,建议当阈值低于阈值时推断出接地故障。