DE380176C - Safety circuit for the connection of three-phase motors - Google Patents
Safety circuit for the connection of three-phase motorsInfo
- Publication number
- DE380176C DE380176C DER54463D DER0054463D DE380176C DE 380176 C DE380176 C DE 380176C DE R54463 D DER54463 D DE R54463D DE R0054463 D DER0054463 D DE R0054463D DE 380176 C DE380176 C DE 380176C
- Authority
- DE
- Germany
- Prior art keywords
- motor
- safety circuit
- phase motors
- connection
- magnet
- 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
- H02H7/08—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 dynamo-electric motors
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Es ist bekannt, an eine Stromverteilungsanlage angeschlossene Motoren durch einen Nullspannungsschalter zu schützen. Diese können indessen beim Unterbrechen einer Phase versagen, weil in dem Fall der Magnet des Nullspannungsschalters durch im Motor erzeugten Strom erregt wird. Der angeschlossene Motor, beispielsweise ein Pumpenmotor läuft dann mit zwei Phasen weiter und verbrenntIt is known to drive motors connected to a power distribution system by a Protect zero voltage switch. These can, however, when a phase is interrupted fail because in that case the magnet of the zero voltage switch is generated in the motor Current is excited. The connected motor, for example a pump motor, is running then continue with two phases and burn
ίο gegebenenfalls.ίο if applicable.
Die Erfindung betrifft eine Schaltung für den Anschluß von Dreiphasenmotoren, bei welcher jede Veränderung im Netz oder im Motor selbst, beispielsweise bei einer Leitungs-Unterbrechung, einem Wicklungsfehler oder bei Körperschluß zum Abschalten des Motors führt. Nach der Erfindung wird der Nullpunkt des Transformators in an sich bekannter Weise mit dem Sternpunkt des Motors verbunden und es wird nun in diese Leitung, die für den Fall eines Körperschlusses zweckmäßig auch mit dem Motorgehäuse verbunden wird, ein Magnet eingeschaltet, der bei seiner Erregung einen die Phasenleitungen und gegebenenfalls auch den Nulleiter öffnenden Schalter freigibt. Da jede Störung im Netz oder im Motor eine Erregung des Magneten hervorruft, so gewährt diese Sicherheitsvorrichtung, die nicht wesentlich teurer ist als die übliche Anordnung des Nullspannungsschalters, einen vollkommenen Schutz für den angeschlossenen Motor.The invention relates to a circuit for connecting three-phase motors which every change in the network or in the motor itself, for example in the event of a line interruption, a winding fault or a short to body leads to the motor being switched off. According to the invention, the zero point of the transformer is connected to the star point of the motor in a manner known per se and it is now in this line, which is expedient in the event of a body shock is also connected to the motor housing, a magnet is switched on at its Excitation opens the phase lines and possibly also the neutral conductor Switch releases. Since every disturbance in the network or in the motor causes the magnet to be excited causes this safety device, which is not significantly more expensive than the usual arrangement of the zero voltage switch, a perfect protection for the connected motor.
Es ist schon vorgeschlagen worden, ganze Stromverteilungsanlagen mit Hilfe eines Schalters zu sichern, der durch einen in den Nullleiter eingeschalteten Magneten ausgelöst wird. Dabei handelt es sich jedoch um einen zusätzlichen Schutz zu .den Schmelzsicherungen und um die Sicherung der Verbindungsanlage bzw. des Transformators, während im vorliegenden Falle ein angeschlossener Motor gegen alle Gefahren dnrch einen Magneten gesichert wird, der in einem zum Gehäuse und zum Sternpunkt des Motors führenden Leiter eingeschaltet ist.It has already been proposed to switch entire power distribution systems with the help of a switch to secure, which is triggered by a magnet connected to the neutral conductor. However, this is an additional protection for the fuses and to secure the connection system or the transformer, while in the present If a connected motor is secured against all hazards by a magnet is switched on in a conductor leading to the housing and the star point of the motor is.
In der Zeichnung ist eine Ausführungsform der Schaltung dargestellt.In the drawing, an embodiment of the circuit is shown.
Der Sternpunkt α sowie das Gehäuse δ eines Dreiphasenmotors c sind durch die Leitung d mit dem Nullpunkt des Transformators ver- g0 bunden. In dieser Leitung liegt der Magnet e, bei dessen Erregung sein Anker f des den Schalter g festhaltenden Magneten h unterbricht. Durch den Magneten e wird der Netzschalter g zum Ausschalten gebracht sobald im Netz oder im Motor irgend welche Störung, z. B. ein Leitungsbruch, ein Wicklungsfehler oder ein Körperschluß, auftritt.The star point α and the housing δ of a three-phase motor are c through line d with the zero point of the transformer comparable g 0 prevented. The magnet e lies in this line , and when it is excited, its armature f of the magnet h holding the switch g is interrupted. The power switch g is switched off by the magnet e as soon as there is any disturbance in the network or in the motor, e.g. B. a line break, a winding fault or a short circuit occurs.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER54463D DE380176C (en) | Safety circuit for the connection of three-phase motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER54463D DE380176C (en) | Safety circuit for the connection of three-phase motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE380176C true DE380176C (en) | 1923-09-03 |
Family
ID=7409662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DER54463D Expired DE380176C (en) | Safety circuit for the connection of three-phase motors |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE380176C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551610A (en) * | 1942-08-14 | 1951-05-08 | Int Standard Electric Corp | Protection of three-phase motors |
-
0
- DE DER54463D patent/DE380176C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551610A (en) * | 1942-08-14 | 1951-05-08 | Int Standard Electric Corp | Protection of three-phase motors |
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