DE532557C - Interturn fault protection for an electrical machine with the help of a relay that responds to a current from its star point - Google Patents
Interturn fault protection for an electrical machine with the help of a relay that responds to a current from its star pointInfo
- Publication number
- DE532557C DE532557C DES89723D DES0089723D DE532557C DE 532557 C DE532557 C DE 532557C DE S89723 D DES89723 D DE S89723D DE S0089723 D DES0089723 D DE S0089723D DE 532557 C DE532557 C DE 532557C
- Authority
- DE
- Germany
- Prior art keywords
- electrical machine
- fault protection
- relay
- responds
- current
- 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 11
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000011835 investigation Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
Der Windungsschlußschutz für elektrische Maschinen mittels Stützdrosseln bereitet häufig dadurch Schwierigkeiten, daß eine Sternpunktsverlagerung in der Maschine nicht nur bei Windungsschluß, sondern auch bei stark unsymmetrischer Belastung, insbesondere bei zweipoligem Kurzschluß, auftritt. Untersuchungen haben gezeigt, daß diese Sternpunktsverlagerung auf den Einfluß desThe interturn protection for electrical machines by means of support chokes prepares often difficulties in that there is no neutral point shift in the machine occurs only when there is a shorted turn, but also when there is a highly asymmetrical load, especially in the case of a two-pole short circuit. Investigations have shown that this neutral point shift on the influence of the
ίο rückläufigen Drehfeldes in der Maschine, insbesondere auf die dadurch hervorgerufene Welligkeit des Erregerstromes, zurückgeführt werden kann. Erfindungsgemäß wird daher die Welligkeit des Erregerstromes unterbunden, indem man in den Erregerstromkreis der Maschine Sperrkreise oder Drosselketten einschaltet, welche praktisch keine Wechselströme höherer Frequenz als Nennfrequenz im Erregerkreis der Maschine mehr zulassen.ίο declining rotating field in the machine, in particular traced back to the ripple of the excitation current caused by this can be. According to the invention, therefore, the ripple of the excitation current is prevented, by switching on blocking circuits or choke chains in the excitation circuit of the machine, which practically no longer allow any alternating currents higher than the nominal frequency in the excitation circuit of the machine.
.20 Die Zeichnung zeigt ein Ausführungebeispiel der Erfindung. 2 ist eine elektrische Maschine, die in an sich bekannter Weise durch das Windungsschlußrelais 3 gegen Windungsschluß geschützt wird, das in den Stromkreis zwischen Sternpunkt der Maschine 2 und der Stützdrossel 4 geschaltet ist. Erfindungsgemäß wird vor die Erregerwicklung 5 der Maschine 2 noch der Sperrkreis· 6 geschaltet, der insbesondere auf die zweite Oberwelle der Netzfrequenz abgestimmt ist, so daß die zweite Oberwelle in dem Erregerkreis der Maschine 2 nicht auftreten kann. An Stelle vor die Erregerwicklung 5 einen Sperrkreis 6 zu schalten, kann man auch entsprechend Abb. 2 vor die Erregerwicklung 5 die Drosselkette 7 schalten, so daß keine Oberwellen in dem Erregerkreis der Maschine 2 auftreten können..20 The drawing shows an embodiment of the invention. 2 is an electric Machine that is protected in a manner known per se by the interturn fault relay 3 against shorted turns, which is in the Circuit between the star point of the machine 2 and the support throttle 4 is connected. According to the invention, before the excitation winding 5 of the machine 2, there is also the blocking circuit 6 switched, which is matched in particular to the second harmonic of the mains frequency, so that the second harmonic in the excitation circuit of the machine 2 cannot occur. Instead of connecting a blocking circuit 6 in front of the excitation winding 5, one can also accordingly Fig. 2 connect the choke chain 7 in front of the excitation winding 5 so that no harmonics can occur in the excitation circuit of the machine 2.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES89723D DE532557C (en) | Interturn fault protection for an electrical machine with the help of a relay that responds to a current from its star point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES89723D DE532557C (en) | Interturn fault protection for an electrical machine with the help of a relay that responds to a current from its star point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE532557C true DE532557C (en) | 1931-09-14 |
Family
ID=7515305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES89723D Expired DE532557C (en) | Interturn fault protection for an electrical machine with the help of a relay that responds to a current from its star point |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE532557C (en) |
-
0
- DE DES89723D patent/DE532557C/en not_active Expired
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