Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1980-08-26
1982-09-28
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 79, H02H 326
Patent
active
043521363
ABSTRACT:
In an impedance-measuring device for impedance protection, 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 I lies inside or outside an impedance zone, which is defined by means of a model impedance, Z.sub.k =R+jX. The comparator is supplied with input quantities corresponding to IX, U.sub.k, I and preferably also U.sub.p, where U.sub.k =U-IZ.sub.k, whereas U.sub.p relates to a voltage which is phase-shifted -90.degree. with respect to U. Quantities corresponding to IX, U.sub.p and I 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 I and U.sub.k, respectively.
REFERENCES:
patent: 3890544 (1975-06-01), Chamia
ASEA Aktiebolag
Eisenzopf Reinhard J.
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