Electricity: electrical systems and devices – Safety and protection of systems and devices – Series connected sections with faulty section disconnect
Patent
1979-12-17
1982-02-23
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Series connected sections with faulty section disconnect
361 81, 361 82, H02H 318
Patent
active
043171516
ABSTRACT:
With heretofore known directional comparison protection systems working with fault direction detectors at both ends of a line section which is to be protected and data transmission between both end stations as well as transmitters and receivers and comparison-evaluation devices for narrowing or sectionalizing the location of the fault site with respect to the line section to be protected, the reliability of such sectionalizing procedure, especially in the case of faults near to an end station, when working with series capacitors or capacitance, is dependent upon the response of the protective gap of such capacitors. With non-response there are produced transient oscillations which can falsify the directional determination. The invention solves this problem by using distance protective relays as the fault direction detectors with line replica or image impedance, which can be switched in the sense of a zone staggering protection. The image impedance for the directional comparison protection is set greater than the impedance of the line section to be protected, preferably is approximately equal to the forward network impedance of the relevant station.
REFERENCES:
patent: 2777093 (1957-01-01), Patrickson
patent: 2849660 (1958-08-01), Gygax
patent: 3337774 (1967-08-01), Rockefeller, Jr.
patent: 3626297 (1971-12-01), Green et al.
De Mesmaeker Ivan
Muller Peter
BBC Brown Boveri & Company Limited
Eisenzopf Reinhard J.
Kleeman Werner W.
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