DE538781C - Method for de-energizing alternating current generators - Google Patents
Method for de-energizing alternating current generatorsInfo
- Publication number
- DE538781C DE538781C DES64375D DES0064375D DE538781C DE 538781 C DE538781 C DE 538781C DE S64375 D DES64375 D DE S64375D DE S0064375 D DES0064375 D DE S0064375D DE 538781 C DE538781 C DE 538781C
- Authority
- DE
- Germany
- Prior art keywords
- excitation
- alternating current
- exciter
- current generators
- 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
- 238000000034 method Methods 0.000 title claims description 5
- 238000004804 winding Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 description 11
- 230000005389 magnetism Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000003313 weakening effect Effects 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/12—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for demagnetising; for reducing effects of remanence; for preventing pole reversal
- H02P9/123—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for demagnetising; for reducing effects of remanence; for preventing pole reversal for demagnetising; for reducing effects of remanence
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Description
Verfahren zum Entregen von Wechselstrom-Generatoren Man pflegt große Drehstromgeneratoren, deren Erregerstrom von selbsterregten Erregermaschinen erzeugt wird, bei Störungen dadurch zu entregen, daß man in den Nebenschluß der Erregermaschine einen großen Widerstand einschaltet, so daß die Erregermaschine sich entregt und damit auch die Hauptmaschine außer Wirkung setzt. Dieses Verfahren ist unvollkommen, weil sowohl die Erregermaschine wie die Hauptmaschine remanenten Magnetismus besitzen. Es fließt daher in der Erregerwicklung der Hauptmaschine ein erheblicher Remanenzstrom, der bis zu 5 % des maximalen Erregerstromes betragen kann pnd der daher bei Maschinen mit starker Regulierung des Erregerstromes erhebliche Bruchteile des Leerlauferregerstromes ausmacht. Hierzu addiert sich noch das Remanenzfeld des Drehstromgenerators, so daß die Netzspannung trotz Einschalten eines großen Feldschwächungswiderstandes unter ungünstigen Umständen nur auf etwa 1/3 der Nennspannung herabsinkt.Method of de-energizing alternating current generators One cultivates great Three-phase generators whose excitation current is generated by self-excited excitation machines is to be de-energized in the event of malfunctions by shunting the exciter machine turns on a large resistance so that the exciter is de-energized and so that the main engine is also ineffective. This procedure is imperfect because both the exciter and the main machine have remanent magnetism. A considerable remanence current therefore flows in the excitation winding of the main machine, which can amount to up to 5% of the maximum excitation current pnd therefore for machines with strong regulation of the excitation current, considerable fractions of the no-load excitation current matters. The remanence field of the three-phase generator is added to this, see above that the mains voltage is switched on despite a large field weakening resistor under unfavorable circumstances only drops to about 1/3 of the nominal voltage.
Dieser Übelstand wird nach der Erfindung dadurch behoben, daß mit dem Einschalten des feldschwächenden Widerstandes vor die Nebenschlußwicklung die Erregerwicklung der Hauptmaschine umgepolt wird. Alsdann wirken die von den beiden Remanenzfeldern der Hauptmaschine und der Erregermaschine erzeugten Spannungen einander entgegen und schwächen sich gegenseitig, anstatt sich, wie bisher, zu unterstützen. Da das Restfeld der Erregermaschine meistens prozentual größer ist als das der Hauptmaschine, sind die einander entgegenwirkenden Spannungen ungleich und heben sich nicht vollständig auf. Man kann aber das Restfeld noch weiter dadurch schwächen, daß man auch noch die Nebenschlußwicklung der Erregermaschine umschaltet.This drawback is remedied according to the invention in that with switching on the field-weakening resistor in front of the shunt winding The polarity of the field winding of the main machine is reversed. Then the two of them work The remanence fields of the main machine and the exciter machine generated voltages for each other oppose and weaken each other instead of supporting each other as before. Since the residual field of the exciter machine is usually larger in percentage than that of the main machine, the opposing tensions are unequal and do not cancel each other out completely on. But you can weaken the remaining field even further by also still the shunt winding of the exciter switches over.
Die Erfindung ist in der Zeichnung veranschaulicht. Diese zeigt einen Generator ä, der das Netz n speist. Die Erregerwicklung c des Generators wird von der Erregermaschine e mit dem Anker a und der Erregerwicklung b gespeist. Zur Schnellentregung ist in bekannter Weise der Widerstand r vorgesehen, der durch den Schalters beim Entregen in den Erregerstromkreis der Erregermaschine eingeschaltet wird. Außerdem ist nach der Erfindung noch ein Umschalter tt angeordnet, der beim Entregen die Erregerwicklung,' des Generators umschaltet und damit diese umpolt, wodurch die Entregung beschleunigt wird.The invention is illustrated in the drawing. This shows you Generator ä that feeds the network n. The excitation winding c of the generator is from the exciter e with the armature a and the excitation winding b fed. For quick de-energization the resistor r is provided in a known manner, which is determined by the switch at De-excitation is switched on in the excitation circuit of the excitation machine. aside from that is still arranged according to the invention, a switch tt that when de-energizing Excitation winding, 'of the generator switches and thus reverses the polarity, whereby the De-excitation is accelerated.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES64375D DE538781C (en) | Method for de-energizing alternating current generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES64375D DE538781C (en) | Method for de-energizing alternating current generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE538781C true DE538781C (en) | 1931-11-24 |
Family
ID=7497135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES64375D Expired DE538781C (en) | Method for de-energizing alternating current generators |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE538781C (en) |
-
0
- DE DES64375D patent/DE538781C/en not_active Expired
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