DE549347C - Safety circuit for electromagnetically controlled star-delta switch - Google Patents
Safety circuit for electromagnetically controlled star-delta switchInfo
- Publication number
- DE549347C DE549347C DENDAT549347D DE549347DD DE549347C DE 549347 C DE549347 C DE 549347C DE NDAT549347 D DENDAT549347 D DE NDAT549347D DE 549347D D DE549347D D DE 549347DD DE 549347 C DE549347 C DE 549347C
- Authority
- DE
- Germany
- Prior art keywords
- star
- delta
- switch
- safety circuit
- electromagnetically controlled
- 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
- 238000004804 winding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 2
- 241000566137 Sagittarius Species 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/32—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by star/delta switching
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Description
Sicherheitsschaltung für elektromagnetisch gesteuerte Stern-Dreieckschalter Die Umschaltung bei Stern-Dreieckschaltern darf erst dann erfolgen, wenn der Sternpunkt der Ständerphasen des Drehstrom-Motors aufgelöst ist. -Nun tritt häufig der Fall ein, daß trotz öffnen des Sternschalters der Sternpunkt infolge des Lichtbogens an den Kontakten noch bestehen bleibt. Durch Einlegen des Dreieckschalters in diesem Zeitpunkt wird daher ein Netzkurzschluß verursacht. Um diesen Übelstand zu verhindern, sind bereits Schaltungen bekannt geworden, bei denen ein zusätzliches Hilfsrelais vorgesehen ist. Die Anäugspule dieses Relais liegt dabei an der Phasenspannung und gestattet ein Einschalten des Dreieckschalters erst, wenn der Lichtbogen im Sternschalter erloschen ist.Safety circuit for electromagnetically controlled star-delta switches The changeover with star-delta switches may only take place when the star point the stator phases of the three-phase motor is resolved. -Well the case often occurs one that despite opening the star switch, the star point as a result of the arc remains on the contacts. By inserting the triangle switch in this Point in time, a network short-circuit is therefore caused. To prevent this evil circuits are already known in which an additional auxiliary relay is provided. The suction coil of this relay is due to the phase voltage and allows the delta switch to be switched on only when the arc is in the star switch is extinguished.
Gegenstand der Erfindung ist eine Schaltanordnung, bei der ohne zusätzliche Relais ein Einschalten des Dreieckschützes vor Erlöschen des Lichtbogens im Sternschalter verhindert wird.The invention is a switching arrangement in which without additional Relay switches on the delta contactor before the arc in the star switch is extinguished is prevented.
Zu diesem Zweck erhält erfindungsgemäß die Spule des elektromagnetisch gesteuerten Dreieckschalters erst durch vollständiges Öffnen der in Stern verketteten Motorwicklung die volle bzw. nahezu volle Netzspannung und leitet dadurch den folgenden Schaltvorgang ein.For this purpose, according to the invention, the coil receives the electromagnetic controlled delta switch only by fully opening the star-linked Motor winding the full or almost full mains voltage and thus conducts the following Switching process on.
Die beiliegenden Zeichnungen zeigen ein Ausführungsbeispiel einer Schaltung nach dem Erfindungsgedanken. In Abb. z ist die Wicklung des Motors a in Stern geschaltet. Die Spule b des Dreieekschalters liegt an den Klemmen u und Y> zwischen welchen die Spannung also die Phasenspannung der in Stern verketteten Ständerwicklungherrscht. Das Magnetsystem des Schalters ist so abgeglichen, daß diese Spannung nicht genügt, um einen genügend großen Fluß zum Ansprechen des Dreieckschützes zu erzeugen. Wird dagegen der Sternpunkt der Ständerwicklung geöffnet, so wird nach Erlöschen des Schaltlichtbogens die Spule, wie Abb. z zeigt, an eine Spannung gelegt, die infolge des jetzt geringen Spannungsabfalles in der Motorwicklung nicht viel kleiner als die Netzspannung ist. Nunmehr leitet der von der Spule reit zugehörigem Magnetsystem gesteuerte Schalter den gewünschten Schaltvorgang ein.The accompanying drawings show an embodiment of a circuit according to the inventive concept. In Fig. Z, the winding of the motor a is connected in star. The coil b of the triangle switch is connected to the terminals u and Y> between which the voltage is applied that is, the phase voltage of the stator winding linked in a star prevails. The magnet system of the switch is balanced in such a way that this voltage is not sufficient to generate a sufficiently large flux for the delta contactor to respond. If, on the other hand, the star point of the stator winding is opened, after the switching arc has been extinguished, the coil is connected to a voltage, as shown in Fig. Now the switch controlled by the coil belonging to the magnet system initiates the desired switching process.
Der Vorteil der Schaltung gemäß der Erfindung liegt darin, daß ein betriebssicheres Arbeiten des Stern-Dreieckanlassers ohne Zuhilfenahme irgendwelcher zusätzlicher Apparate gewährleistet -wird. Dabei ist es ohne weiteres möglich, Schütze normaler Bauart zu verwenden.The advantage of the circuit according to the invention is that a Safe working of the star-delta starter without the aid of any additional equipment is guaranteed. In doing so, it is easily possible to Sagittarius normal design to be used.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE549347T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE549347C true DE549347C (en) | 1932-04-26 |
Family
ID=6562264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT549347D Expired DE549347C (en) | Safety circuit for electromagnetically controlled star-delta switch |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE549347C (en) |
-
0
- DE DENDAT549347D patent/DE549347C/en not_active Expired
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