Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1980-06-11
1982-10-12
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 62, H02H 300
Patent
active
043542158
ABSTRACT:
In a selective safety device for the protection of successive power levels in a power distribution system, a current limiting switch is provided in each of the power levels and includes a current-limiting quick-switching contact which is so positioned at the power supply side in each one of the different power levels such that the current limiting switch immediately in front of a fault is switched off upon occurrence of a fault. A resistor is connected across each of the quick-switching contacts and is serially connected in the interrupted circuit upon the opening action of the quick-switching contact. Additionally, a slow-switching contact is serially connected with each of the quick-switching contacts to be opened after opening of the quick-switching contact with a presettable delay time, which is dependent upon the power levels in which the slow-switching contact is connected. The resistor across the quick-switching contacts includes at least two serially connected resistance conductors which are gradually introduced in the interrupted circuit by the arc formed between the resistance conductors upon opening of an associated quick-opening switching contact.
REFERENCES:
patent: 3152284 (1964-10-01), Pulsford
patent: 3873887 (1975-03-01), Barkan et al.
patent: 4070641 (1978-01-01), Khalid
Publication "Betriebs-Technik 1966", by Arno Treptow, Heft 10, Strombegrenzende Kurzschlussausschaltungen in Niederspannungsverteilungen.
Eisenzopf Reinhard J.
Hazemeijer B.V.
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