G - Physics – 01 – R
Patent
G - Physics
01
R
324/35
G01R 27/16 (2006.01) H02H 3/38 (2006.01)
Patent
CA 1143008
- 1 - ABSTRACT OF THE DISCLOSURE In an impedance-measuring device for impedance protec- tion, the phase positions of a plurality of alternating- current quantities are compared with the aid of a phase comparator. From the output signal thereof it is clear whether the impedance in a fault loop with a voltage U and a current ? lies inside or outside an impedance zone, which is defined by means of a model impedance, Image The comparator is supplied with input quantities corres- ponding to ??, ?k, ? and preferably also ?p, where Image , whereas ?p relates to a voltage which is phase- shifted -90° with respect to U. Quantities corresponding to ??, ?p and ? are each supplied to one input of a second logic component. This second logic component also has an input which is connected, via a delay element, to the output of a first logic component, the two inputs of which are supplied with quantities corresponding to ? and ?k, respectively.
359290
Asea Aktiebolag
Robic Robic & Associes/associates
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