G - Physics – 01 – R
Patent
G - Physics
01
R
324/58
G01R 21/07 (2006.01) H02H 3/46 (2006.01) H02H 7/06 (2006.01) H02J 9/06 (2006.01)
Patent
CA 1105999
ABSTRACT OF THE DISCLOSURE An arrangement for monitoring a current network, to which is connected at least one self-excited or separately- excited three-phase synchronous machine which is in operative connection with, for example, an instantaneous stand-by unit with an energy-storage means. A monitoring unit, controlling the mains switch, is connected between the neutral point of the three-phase synchronous machine and the neutral conductor of the network. The monitoring unit comprises an Mp current transformer followed by a load, and a frequency relay. The frequency relay determines the zero passages of the voltage occurring at the load. The falling of the zero-passage frequency, below a predetermined value, serves as a signal of a mains failure, for actuating the mains switch, and/or for other switching procedures. The outputs from the loads are connected in series and the terminal outputs are connected to the frequency relay, for the purpose of monitoring a plurality of three-phase synchronous machines.
306792
Ad. Struver Kg G.m.b.h. & Co.
Swabey Ogilvy Renault
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