Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1982-09-20
1984-07-03
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
324 52, 361 80, H02H 726
Patent
active
044582854
ABSTRACT:
The invention relates to a low impedance excitation system for use in distance relays. In such a system the low impedance check is carried out by comparing the phases of signals (U.sub.D,U.sub.S) which are obtained by forming the sum and the difference from an image voltage signal (U.sub.A) and a line voltage signal (U.sub.K). 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) takes place as an operational function of the phase difference (.beta.) between the image voltage signal (U.sub.A) and the line voltage signal (U.sub.K).
REFERENCES:
patent: 3325687 (1967-06-01), Ungrad
patent: 4128805 (1978-12-01), Lanz
BBC Brown Boveri & Company Limited
Moose Jr. Harry E.
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