DE591425C - Protection circuit for AC machines - Google Patents
Protection circuit for AC machinesInfo
- Publication number
- DE591425C DE591425C DES94079D DES0094079D DE591425C DE 591425 C DE591425 C DE 591425C DE S94079 D DES94079 D DE S94079D DE S0094079 D DES0094079 D DE S0094079D DE 591425 C DE591425 C DE 591425C
- Authority
- DE
- Germany
- Prior art keywords
- circuit
- machines
- excitation
- protection circuit
- excitation winding
- 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
- 230000005284 excitation Effects 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 10
- 230000006378 damage Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- H02H7/06—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 generators; for synchronous capacitors
- H02H7/065—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 generators; for synchronous capacitors against excitation faults
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
Siernens-Schuckertwerke Akt.-Ges. in Berlin-SiemensstadtSiernens-Schuckertwerke Akt.-Ges. in Berlin-Siemensstadt
Schutzschaltung für WechselstrommaschinenProtection circuit for AC machines
Patentiert im Deutschen Reiche vom 26. September 1929 abPatented in the German Empire on September 26, 1929
Die Priorität der Anmeldung in den Vereinigten Staaten von Amerika vom 6. Oktober 192gThe priority of filing in the United States of America from October 6, 192g
ist in Anspruch genommen.is used.
Es ist bekannt, daß bei Wechselstrommaschinen im Erregerkreis Überspannungen auftreten können, welche die Isolation der Erregerwicklung gefährden. Zur Ableitung dieser Überspannungen hat man Überspannungsableiter parallel zu der Erregerwicklung vorgesehen. Ferner hat man zum Schutz der Erregerwicklung wattmetrische Relais angewendet, deren beide Spulen von der Spannung an der Erregerwicklung und vom Erregerstrom beeinflußt werden.It is known that overvoltages occur in the excitation circuit in AC machines which endanger the isolation of the excitation winding. To dissipate these overvoltages surge arresters have been provided parallel to the excitation winding. Furthermore, one has to protect the excitation winding Wattmetric relays are used, the two coils of which from the voltage on the excitation winding and influenced by the excitation current.
Erfindungsgemäß werden die Spulen des im Erregerkreis liegenden wattmetrischen Relais derart geschaltet, daß die eine von dem beim Auftreten von Überspannungen über den Überspannungsableiter fließenden Strom und die andere von der Spannung an der Erregerwicklung der Wechselstrommaschine erregt wird. Das Relais bewirkt bei seinem Ansprechen die Abschaltung der Maschine vom Netz. Dadurch wird die Ursache für das Entstehen der Überspannungen beseitigt, wodurch nicht nur die Gefahren für den Erregerkreis herabgesetzt, sondern gleichzeitig auch die Zerstörung des Ableiters durch einen etwa stehenbleibenden Lichtbogen vermieden wird. Der Überspannungsableiter braucht infolgedessen, im Gegensatz zu der bekannten Anordnung, nur für die verhältnismäßig geringen Entladungsströme der Induktivitäten des Erregerkreises bemessen zu werden. Er kann daher so gebaut werden, daß er schon bei geringeren Überspannungen anspricht, wodurch seine Schutzwirkung für den Erregerkreis erhöht wird.According to the invention, the coils of the wattmetric relay located in the excitation circuit are used switched in such a way that one of the overvoltages across the surge arrester flowing current and the other is excited by the voltage on the excitation winding of the alternator. That When the relay is triggered, the machine is switched off from the mains. Through this the cause of the surge voltage is eliminated, which not only removes the Dangers to the excitation circuit are reduced, but also the destruction of the Arrester is avoided by any remaining arc. The surge arrester As a result, in contrast to the known arrangement, only needs for the relatively low discharge currents of the To be measured inductances of the excitation circuit. It can therefore be built so that it responds even to lower overvoltages, which increases its protective effect for the Excitation circuit is increased.
Ein Ausführungsbeispiel der Erfindung zeigt die Abbildung.An embodiment of the invention is shown in the figure.
Die Drehspule eines wattmetrischen Relais 23 liegt an einem Shunt 24 im Stromkreis eines Überspannungsabieiters 16, welcher parallel zu einer zu schützenden Erregerwicklung 13 einer Wechselstrommaschine 10 liegt. Die Schaltung hat den Vorteil, daß, falls der Schalter 12 geschlossen wird, bevor der Generator 10 seine volle Umdrehungszahl erreicht hat, die in der Erregerwicklung 13 transformatorisch erzeugte Spannung den Überspannungsableiter 16 zum Ansprechen und zugleich über Relais 23 die Maschine mittels eines Schalters 12 zur Abschaltung bringt.The moving coil of a wattmetric relay 23 is connected to a shunt 24 in the circuit of a Surge arrester 16, which is parallel to an excitation winding 13 to be protected AC machine 10 is located. The circuit has the advantage that if the switch 12 is closed is before the generator 10 has reached its full number of revolutions, which is in the Excitation winding 13 generated by a transformer Voltage the surge arrester 16 to respond and at the same time via relay 23 the Brings machine by means of a switch 12 to shutdown.
Zur Speisung der Erregerwicklung 13 ist eine selbsterregte Gleichstromnebenschlußmaschine 14 angenommen, in deren Belastungskreis ein Schalter 15 vorgesehen ist.A self-excited DC shunt machine is used to feed the field winding 13 14 assumed, in whose load circuit a switch 15 is provided.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES94079D DE591425C (en) | Protection circuit for AC machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES94079D DE591425C (en) | Protection circuit for AC machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE591425C true DE591425C (en) | 1934-01-20 |
Family
ID=7518449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES94079D Expired DE591425C (en) | Protection circuit for AC machines |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE591425C (en) |
-
0
- DE DES94079D patent/DE591425C/en not_active Expired
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