DE457436C - Zero voltage protection for single armature converters - Google Patents
Zero voltage protection for single armature convertersInfo
- Publication number
- DE457436C DE457436C DEA47664D DEA0047664D DE457436C DE 457436 C DE457436 C DE 457436C DE A47664 D DEA47664 D DE A47664D DE A0047664 D DEA0047664 D DE A0047664D DE 457436 C DE457436 C DE 457436C
- Authority
- DE
- Germany
- Prior art keywords
- relays
- zero voltage
- voltage protection
- voltage
- voltages
- 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
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/103—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for rotating converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Description
Nullspannungsschutz für Einanker-Umformer. Einanker-Umformer fallen bekanntlich außer Tritt, wenn die Spannung auch nur für einen Augenblick ausbleibt. Sie müssen also heim -Verschwinden der Spannung sofort abgeschaltet werden. Anderseits wird der Detrieb aber sehr stark beunruhigt, wenn das Abschalten bei jedem Rückgang der Spannung erfolgt.Zero voltage protection for single armature converters. Single anchor converter fall as is well known, out of step if the tension is absent even for a moment. So you have to go home - the voltage disappears and be switched off immediately. On the other hand the drift becomes very worried when it switches off with every decrease the tension takes place.
Gegenstand der Erfindung ist eine Schutzanordnung, die in allen Fällen, in denen es notwendig ist, aber nur in diesen Fällen, sicher anspricht. Wenn in einem Drehstromnetz in einer Phase oder zwischen zwei Phasen ein Kurzschluß auftritt, so verhindert die Spannung der gesunden Phasen auf alle Fälle das Außertrittfallen der Einanker-Umformer, auch wenn in den betroffenen Phasen die Spannung vollständig verschwindet. Bei einem allpoligen Kurzschluß müssen erfahrungsgemäß die Spannungen sehr stark, jedenfalls unter den Betrag von 2o Prozent des '.,\'#ormalwerts sinken, damit die Umformer außer Tritt fallen.The subject matter of the invention is a protective arrangement, which in all cases in which it is necessary, but only in these cases, reliably responds. If in a three-phase network occurs in one phase or between two phases, in this way the tension of the healthy phases in any case prevents falling out of step the single-armature converter, even if the voltage is completely in the affected phases disappears. In the case of an all-pole short circuit, experience has shown that the voltages very strongly, at least below the amount of 2o percent of the '., \' # normal value, so that the converters fall out of step.
Es ist also an den Schutz die Anforderung zu stellen, daß er nur in diesem letzten Falle die Umformer abschaltet.The requirement must therefore be placed on the protection that it only works in in this last case the converter switches off.
Zu diesem Zweck schaltet man z. B. zwei Nullspannungsrelais zwischen je zwei Phasen des Drehstromnetzes. Die Relais werden so eingestellt, daß sie erst ansprechen, wenn die Spannung unter 2o Prozent gesunken ist. Außerdem werden sie so verbunden, daß eine Wirkung nach außen, also die Auslösung, nur dann erfolgt, wenn beide Relais gleichzeitig ansprechen. Das kann man in einfachster Weise dadurch erreichen, daß man beide Relais mit Arbeitskontakten versieht, die in Serienschaltung in dem Stromkreis des Auslösemagneten des Ölschalters liegen.For this purpose one switches z. B. two zero voltage relays between two phases of the three-phase network. The relays are set so that they only respond when the voltage has dropped below 2o percent. Besides, they will connected in such a way that an external effect, i.e. triggering, only takes place if both relays respond at the same time. You can do that in the simplest way achieve that both relays are provided with normally open contacts that are connected in series lie in the circuit of the trigger magnet of the oil switch.
Schließt man die Relais anstatt an die verketteten Spannungen an die Phasenspannungen an, so muß man in einem in Stern geschalteten Drehstromnetz drei Relais verwenden, die man in der angegebenen Weise verbindet. Die Anzahl der Relais, die in jedem einzelnen Falle, z. B. auch beim Anschluß an der aufgelösten Drehstromseite, notwendig sind, ergibt sich ohne weiteres aus der Forderung, daß nur beim allpoligen Kurzschluß ein Abschalten erfolgen darf.If the relays are closed instead of the linked voltages to the Phase voltages, you have to have three in a star-connected three-phase network Use relays that are connected in the manner indicated. The number of relays, which in each individual case, e.g. B. also when connecting to the resolved three-phase current side, are necessary, results from the requirement that only with all-pole Short circuit shutdown may take place.
In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt. In Abb. i sind an zwei verkettete Spannungen eines Drehstromnetzes WVU über Spannungswandler a zwei Spannungsrückgangsrelais b angeschlossen. Ihre Anker c halten den um den Punkt d drehbaren Hebel e so fest, daß dieser nur dann mit seinem rechten Ende auf den Kontakt f fallen kann, wenn er von beiden Ankern losgelassen ist, d. h. wenn die Spannung in beiden Relais so weit gesunken ist, daß beide Anker fallen. Durch Schließen des Kontaktes f wird dann der Umformer abgeschaltet.Two exemplary embodiments of the invention are shown in the drawing. In Fig. I there are two linked voltages of a three-phase network WVU via voltage converters a two voltage drop relays b connected. Your anchors c hold the around the Point d rotatable lever e so firmly that this only then with its right end on contact f can drop when it is released from both armatures, d. H. if the voltage in both relays has dropped so far that both armatures drop. By Conclude of contact f the converter is then switched off.
Werden die Relais an die Phasenspannung angeschlossen, so braucht man drei Relais. In Abb. 2 ist eine solche Anordnung dargestellt. Die Anker c der Relais b schließen bei Spannungsrückgang je einen Arbeitskontakt f. Da diese Kontakte falle in Serie liegen, wird der die Auslösespule g speisende atromkreis erst dann geschlossen, wenn alle drei Anker gefallen sind.If the relays are connected to the phase voltage, three relays are required. Such an arrangement is shown in Fig. 2. The armatures c of the relays b each close a normally open contact f when the voltage drops. Since these contacts f are all in series, the circuit feeding the trip coil g is only closed when all three armatures have dropped.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA47664D DE457436C (en) | 1926-05-01 | 1926-05-01 | Zero voltage protection for single armature converters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA47664D DE457436C (en) | 1926-05-01 | 1926-05-01 | Zero voltage protection for single armature converters |
Publications (1)
Publication Number | Publication Date |
---|---|
DE457436C true DE457436C (en) | 1928-03-16 |
Family
ID=6935910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA47664D Expired DE457436C (en) | 1926-05-01 | 1926-05-01 | Zero voltage protection for single armature converters |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE457436C (en) |
-
1926
- 1926-05-01 DE DEA47664D patent/DE457436C/en not_active Expired
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