DE589379C - Protection device against overcurrents in an electrical distribution network - Google Patents
Protection device against overcurrents in an electrical distribution networkInfo
- Publication number
- DE589379C DE589379C DE1930589379D DE589379DD DE589379C DE 589379 C DE589379 C DE 589379C DE 1930589379 D DE1930589379 D DE 1930589379D DE 589379D D DE589379D D DE 589379DD DE 589379 C DE589379 C DE 589379C
- Authority
- DE
- Germany
- Prior art keywords
- relay
- overcurrent
- excitation
- protection device
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
Es ist bekannt, durch Überstromrelais ein Netz, in dem ein Kurzschluß auftritt, von seiner Stromquelle abzuschalten. Dies hat den Nachteil, daß das ganze Netz stromlos wird und daß Einrichtungen, die dazu dienen, die fehlerhafte Strecke selektiv abzuschalten, nicht ansprechen können. Man hat deshalb vorgeschlagen, die Spannung, welche in das Netz geliefert wird, beim Auftreten eines Überstromes nur herabzusetzen. Auch dieses Mittel führt nicht immer zum Erfolg; denn es ist nicht möglich, das Maß, um das die Spannung herabgesetzt wird, so zu bestimmen, daß bei der Verschiedenart der auftretenden Fehler die Spannung gerade auf den erforderlichen Wert zurückgeht.It is known to use overcurrent relays in a network in which a short circuit occurs switch off its power source. This has the disadvantage that the entire network is de-energized and that devices which serve to selectively switch off the faulty route, can not address. It has therefore been suggested that the tension which is contained in the Mains is supplied, only to be reduced in the event of an overcurrent. This too Means do not always lead to success; because it is not possible to measure the extent to which the Voltage is lowered, so to determine that with the variety of occurring Error the voltage is just going back to the required value.
Die Erfindung bezieht sich auf solche Anordnungen, bei denen Relais verwendet werden, die beim Ansprechen durch Öffnen oder Schließen ihrer Kontakte die in das Netz gelieferte Spannung herabsetzen. Erfindungsgemäß wird beim Ansprechen der Überstromrelais ihre Empfindlichkeit herabgesetzt und erst wieder beim Schließen bzw. Öffnen ihrer Kontakte erhöht. Eine solche Anordnung gibt, wie das Ausführungsbeispiel zeigen wird, die Möglichkeit, die Spannung stets so weit zu vermindern, daß der Strom'unabhängig davon, ob ein ein-, zwei- oder mehrpoliger Kurzschluß auftritt, und unabhängig von dem Widerstände der Fehlerstelle immer noch gerade so weit oberhalb des normalen Belastungsstromes bleibt, daß die im Netz vorhandenen selektiven Schutzeinrichtungen richtig ansprechen.The invention relates to such arrangements in which relays are used, the ones delivered to the network when responding by opening or closing their contacts Decrease tension. According to the invention, when the overcurrent relay responds, its sensitivity is reduced and only increased again when their contacts are closed or opened. Such an arrangement gives, as the embodiment will show, the possibility of the voltage always like this To reduce far that the Strom'independent of whether a one, two or multi-pole Short-circuit occurs, and regardless of the resistance of the fault location still straight remains so far above the normal load current that the existing in the network address selective protective devices correctly.
Zweckmäßigerweise setzt man beim Ansprechen der Überstromrelais ihre Empfindlichkeit ohne Verzögerung, die Spannung dagegen allmählich herab und bemißt die Verringerung der Empfindlichkeit der Relais derart, daß sie ihren Kontakt bei derselben Stromstärke öffnen, bei der er vorher geschlossen worden war oder. umgekehrt. Das allmähliche Herabsetzen der Spannung kann in an sich bekannter Weise durch Entregen des Generators vorgenommen werden. 'It is advisable to set their sensitivity when the overcurrent relays respond without delay, but the voltage gradually decreases and measures the reduction in the sensitivity of the relay so that they open their contact at the same current strength at which he had previously been closed or. vice versa. Gradual lowering of the Voltage can be applied in a manner known per se by de-energizing the generator will. '
In der Abbildung ist ein Aasführungsbeispiel der Erfindung dargestellt. 1, 2 und 3 sind die drei Phasenleitungen eines Netzes, das von dem Generator 4 gespeist wird. In •dem Erregerkreis der Erregermaschine 5 des Generators liegen ein Regler 6 und ein Widerstand/. Dieser Widerstand ist im normalenAn example of the invention is shown in the figure. 1, 2 and 3 are the three phase lines of a network that is fed by the generator 4. A controller 6 and a resistor / are located in the excitation circuit of the exciter 5 of the generator. This resistance is normal
*) Von dem Patentsucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Dipl.-Ing. Oskar Schmutz in Berlin-Haselhorst.Dipl.-Ing. Oskar Schmutz in Berlin-Haselhorst.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE589379T | 1930-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE589379C true DE589379C (en) | 1933-12-06 |
Family
ID=6572540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1930589379D Expired DE589379C (en) | 1930-02-26 | 1930-02-26 | Protection device against overcurrents in an electrical distribution network |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE589379C (en) |
-
1930
- 1930-02-26 DE DE1930589379D patent/DE589379C/en not_active Expired
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