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Voigt and Haeffner AG
Original Assignee
Voigt and Haeffner AG
Publication date
Priority to DEV16356DpriorityCriticalpatent/DE374571C/en
Application grantedgrantedCritical
Publication of DE374571CpublicationCriticalpatent/DE374571C/en
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
H02H1/00—Details of emergency protective circuit arrangements
H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
H02H1/0046—Commutating the detecting means in dependance of the fault, e.g. for reducing their number
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Emergency Protection Circuit Devices
(AREA)
Description
*) Von dem Patentsucher ist als Erfinder· angegeben worden:*) The following has been indicated as inventor by the patent seeker:
Pieter Claas van der Sterr in Frankfurt a. M.Pieter Claas van der Sterr in Frankfurt a. M.
Hierzu 1 Blatt Zeichnungen.1 sheet of drawings.
Claims (2)
Patent-Ansprüche :Patent Claims:1. Anordnung zum Schutz von Stationen mit Spannungsabfallrelais zugleich gegen
Erdschluß und Kurzschluß, dadurch gekennzeichnet, daß die für alle Schalter gemeinsamen Spannungsabfallrelais durch
ein Hilfsrelais bei Kurzschluß von ihrer normalen, für Erdschluß bestimmten Sternschaltung
auf Dreieckschaltung umgeschaltet werden.1. Arrangement to protect stations with voltage drop relays at the same time against
Earth fault and short circuit, characterized in that the voltage drop relay common to all switches through
an auxiliary relay in the event of a short circuit from their normal star connection intended for earth faults
can be switched to delta connection.2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß zur Ausführung der
Umschaltung an den Überstromrelais der einzelnen Schalter besondere Kontakte für
ein Hilfsrelais vorgesehen sind, in dessen Stromkreis Widerstände eingeschaltet werden,
die beim Ansprechen nur einer Phase, also Erdschluß, ein Umschalten des Hilfsrelais
nicht zulassen, während beim Ansprechen in zwei Phasen, also Kurzschluß, durch die Verringerung des Vorschaltwiderstandes
auf die Hälfte das Hilfsrelais anspricht und so die gewünschte Umschaltung vornimmt.2. Arrangement according to claim 1, characterized in that for the execution of the
Changeover to the overcurrent relay of the individual switches special contacts for
an auxiliary relay is provided, in whose circuit resistors are switched on,
when only one phase responds, i.e. an earth fault, the auxiliary relay switches over
not allow it, while responding in two phases, i.e. short circuit, by reducing the series resistance
the auxiliary relay responds to half and thus carries out the desired switchover.
DEV16356D
Arrangement to protect stations with voltage drop relays against earth faults and short circuits at the same time
ExpiredDE374571C
(en)
A method for seamless switching from two parallel rows, each consisting of three power consumers, into three parallel rows of two power consumers each, in particular for electric traction vehicles
Protective device for electrical systems that are fed by several control centers and are provided with counter-grading of the trip relays to isolate a fault in the line between two control centers