Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1995-04-24
1997-04-08
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 87, H02H 318
Patent
active
056193920
ABSTRACT:
In a busbar protection method and a corresponding device, the maximum values of the currents in the outgoers are determined. The maximum values Ikmax of the current characteristics are extended by a certain hold time th. Subsequently, these current characteristics are processed further vectorially. With the aid of these current characteristics Ik changed in such a way, a fault signal is calculated by means of a protection algorithm, preferably the current comparison method with current stabilization or the phase comparison algorithm. It can be uniquely determined on the basis of the extension of the maximum according to the invention whether an external fault or an internal one is concerned. The advantage of the method and of the device according to the invention resides, in particular, in that the localization of the fault is possible in a reliable fashion even in the case of strong saturation of the current transformers. Above all, false tripping can be reliably avoided even in the case of external faults.
REFERENCES:
patent: 5367425 (1994-11-01), Saha et al.
"Digitale Filteralgorithmen zur Echtzeit-ermittlung, etc.", T. Lobos, Elektrie, Berlin 46 (1992), pp. 29-34.
"Elektronischer Sammelschienenschutz", H. Haug, et al., Brown Boveri Mitteilungen, Band 53, Nr. 4/5, Apr./May 1966, pp. 326-339.
Schutztechnik in Elektro-energiesystemen, Grundlagen, Stand der Technik, H. Ungrad, et al., 1991, pp. 182-201.
Bertsch Joachim
Peck David
Asea Brown Boveri AG
Gaffin Jeffrey A.
Sherry Michael J.
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