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    VERFAHREN UND VORRICHTUNG ZUR MESSUNG ELEKTRISCHER STRÖME MIT HILFE EINES STROMWANDLERS
    1.
    发明公开
    VERFAHREN UND VORRICHTUNG ZUR MESSUNG ELEKTRISCHER STRÖME MIT HILFE EINES STROMWANDLERS 有权
    方法和用于测量电流使用电流互感器

    公开(公告)号：EP2732293A1

    公开(公告)日：2014-05-21

    申请号：EP12758391.2

    申请日：2012-07-12

    申请人： Ean Elektroschaltanlagen GmbH

    发明人： RATHSMANN, Stefan

    IPC分类号： G01R15/18 ,  H02H3/32

    CPC分类号： G01R15/183 ,  G01R15/185

    摘要： The invention relates to a method and to device for measuring electric residual currents, which comprise both an alternating current component and a direct current component, by means of an inductive residual current transformer. The known methods for measuring mixed residual currents require special current transformer designs with respect to the coil winding, the magnetic core material and the number of cores. The new method uses the same current transformers that are customary for measuring purely residual alternating currents. According to the invention, the secondary coil (3) of the current transformer is controlled in such a way that the magnetic flux (Φ) linked to the secondary coil (3) in the core remains constant independent of the residual current and the secondary current (Is) required therefor is measured. For this purpose, the ohmic resistance (Rcu) of the secondary coil (3) in the secondary current circuit (4) is compensated by an electronically formed negative resistance (Rz) and a defined magnetic flux is cyclically restored by using the saturation flux (Φs) of the core as reference point.

    摘要翻译： 一种方法，以及用于测量电差动电流，其中在除了交流分量因此包含直流分量，由感应差动电流互感器的装置的设备。 用于测量混合电流的已知方法需要相对于所述线圈卷线和磁性体芯材和芯数特殊电流互感器的设计。 该新方法科佩斯用相同的电流互感器确实是用于测量纯差动交流电流常见。 。根据本发明，电流互感器的次级线圈（3）被控制检查那样的磁通（PHI）与次级线圈连接的（3）内的芯保持恒定，而不管所述差分电流和次级电流（ 是）要求，这是衡量。 为此，在一方面，欧姆电阻器的次级线圈的（RCU）（3）在由在电子产生的负电阻器（R z）的次级电路（4）的补偿，和在另一方面的限定磁通量 周期性地被恢复，芯的DASS DER饱和磁通（。PHI多个）被用作参考点。