G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.03
G01R 31/08 (2006.01) H02H 3/38 (2006.01)
Patent
CA 1194549
ABSTRACT OF THE DISCLOSURE The invention relates to a low impedance excitation system for use in distance relays in which system the low impedance check is carried out by means of a method of comparing the phases of signals (UD,US) which are obtained by forming the sum and the difference from an image voltage signal (UA) and a line voltage signal (UK) and in which the triggering characteristic is formed in the complex impedance plane by means of the combination of at least two different triggering characteristics, mainly a circular (K) and a lenticular (L) characteristic, in order to avoid overlapping between the triggering area and the active load area (W) and in order to achieve an adequate arc reserve on the whole Length of line to be monitored, the switching over between the different triggering characteristics (K,L) taking place as an op- erational function of the phase difference (.beta.) between the image voltage signal (UA) and the line voltage signal (UK).
411975
Bbc Brown Boveri And Company Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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