DE639823C - Measuring and protective device - Google Patents
Measuring and protective deviceInfo
- Publication number
- DE639823C DE639823C DEA74140D DEA0074140D DE639823C DE 639823 C DE639823 C DE 639823C DE A74140 D DEA74140 D DE A74140D DE A0074140 D DEA0074140 D DE A0074140D DE 639823 C DE639823 C DE 639823C
- Authority
- DE
- Germany
- Prior art keywords
- winding
- voltage
- star
- phase
- point
- 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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/353—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
Zur Gewinnung der Nullpunktserdspannung bei Erdschlußschutzeinrichtungen werden gewöhnlich Spannungswandler verwendet, die mehrere Wicklungen besitzen. Die eine Wick lung dient zur Gewinnung der Nullpunktserdspannung, d.h. der Spannung des Systemnullpunktes gegen Erde, während die andere Wicklung die Phasenerdspannung, d.h. die Spannung der Phasenleiter gegenüber dem erdgeschlossenen Punkt, liefert. Falls daher für Meßzwecke oder für weitere Schutzeinrichtungen noch die Phasennullpunktsspannung benötigt wird, mußte man bisher zu diesem Zwecke einen besonderen Wandler vorsehen.To obtain the zero-point earth voltage in earth-fault protection devices are usually Used voltage converters that have multiple windings. One winding is used to obtain the zero-point earth voltage, i.e. the voltage of the system zero point to earth, while the other winding has the phase earth voltage, i.e. the Voltage of the phase conductors with respect to the earth-connected point. If so for measuring purposes or for other protective devices, the phase zero point voltage is required, you previously had to provide a special converter for this purpose.
Die Erfindung sucht dies nun dadurch zu vermeiden, daß die Phasennullpunktsspannungen durch geometrische Zusammensetzung der Phasenerdspannung, also der Spannung des Phasenleiters gegenüber dem erdgeschlossenen Punkte, und der Nullpunktserdspannung gebildet werden, wobei die Nullpunktserdspannung bei sattem Leitererdschluß in ihrer Größe gleich der Phasennullpunktsspannung sein muß.The invention seeks to avoid this by reducing the phase zero voltages by the geometric composition of the phase earth voltage, i.e. the voltage of the Phase conductor with respect to the earth-connected point, and the zero-point earth voltage are formed, the zero point ground voltage with a full conductor ground fault in their Size must be equal to the phase zero point voltage.
In Abb. ι ist ein Ausführungsbeispiel für einen unverketteten Mehrphasenwandler mit einer Primärwicklung 1 und einer in Stern geschalteten Sekundärwicklung 2 sowie einer in offenem Dreieck geschalteten Wicklung 3. dargestellt. An der offenen Dreieckswicklung 3 wird die Nullpunktserdspannung oder die Summenphasenerdspannung U0 gewonnen, an der Wicklung 2 die verketteten Spannungen U sowie die Spannung der Phasenleiter gegenüber dem erdgeschlossenen Punkt, d.h. die Phasenerdspannung Ure, Use, Ute- Nach der Erfindung werden die einzelnen Phasennullpunktsspannungen Up durch geometrische ,Zusammensetzung der einzelnen Vektoren U0 und Use bzw. Ure, Ute gewonnen.In Fig. Ι an embodiment of an unlinked polyphase converter with a primary winding 1 and a star-connected secondary winding 2 and a winding 3 connected in an open triangle is shown. On the open triangular winding 3, the neutral point ground voltage or the sum phase ground voltage U 0 is obtained, on the winding 2 the linked voltages U and the voltage of the phase conductors with respect to the grounded point, i.e. the phase ground voltage Ure, Use, Ute- According to the invention, the individual phase neutral point voltages Up obtained by geometrical composition of the individual vectors U 0 and Use or Ure, Ute .
In Abb. 3 ist ein .Spannungsdiagramm gezeigt, das die Gewinnung der Phasennullpunktsspannungen veranschaulicht. Es ist dabei ein Erdschluß in der Sternwicklung der Phase 5 angenommen. Die Spannungen der Phasenleiter gegen Erde betragen Use, Ure, Ute, zu denen die Nullpunktserdspannung U0 jeweils addiert wird. Es ist zu ersehen, daß sich hierdurch ohne weiteres die Phasennullpunktsspannungen Ur, Us, Ut ergeben.A voltage diagram is shown in Fig. 3, which illustrates the extraction of the phase zero point voltages. A ground fault in the phase 5 star winding is assumed. The voltages of the phase conductors to earth are Use, Ure, Ute, to which the zero point earth voltage U 0 is added. It can be seen that this readily results in the phase zero point voltages Ur, Us, Ut .
In Abb. 4 sind die gleichen Spannungsvektoren für einen Erdschluß in einer Dreieckswicklung zwischen den Phasen T und 5 dargestellt,In Fig. 4 the same voltage vectors for an earth fault in a delta winding between phases T and 5 are shown,
In Abb. 2 ist ein Ausführungsbeispiel der Erfindung für einen Wandler dargestellt, der außer der Hochspannungswicklung 1 und der Sternwicklung 3 eine auf einem vierten und fünften Schenkel angeordnete Wicklung 4 zur Gewinnung der Nullpunktserdspannung U0 besitzt. Der Sternpunkt der Wicklung 3 ist da-In Fig. 2 an embodiment of the invention is shown for a converter which, in addition to the high-voltage winding 1 and the star winding 3, has a winding 4 arranged on a fourth and fifth leg for obtaining the zero-point earth voltage U 0 . The star point of winding 3 is there-
*) Von dem Patentsucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Alexander von Schaubert in Berlin.Alexander von Schaubert in Berlin.
bei mit der einen Klemme der Wicklung 4 verbunden. Auch bei dieser Anordnung läßt sich die PhasennuUpunktsspannung Up jeweils durch geometrische Zusammensetzung Spannung der Phasenleiter gegenüber erdgeschlossenen Punkt und der Nullpunkts^.,' erdspannung gewinnen.when connected to one terminal of the winding 4. In this arrangement, too, the phase ground voltage U p can be obtained in each case by the geometrical composition of the voltage of the phase conductors with respect to the grounded point and the neutral point.
Die Zusammensetzung der Vektoren wird natürlich nur dann den richtigen Wert für die PhasennuUpunktsspannung ergeben, wenn die Spannungen der einzelnen Wicklungen in einem entsprechenden Verhältnis zueinander stehen, da nur dann die Bedingung des Hauptanspruches erfüllt ist, daß die NuIlpunktserdspannung bei sattem Leitererdschluß in ihrer Größe gleich der PhasennuUpunktsspannung ist. Dies wird dadurch erreicht, daß die Wicklungsteile der Sternwicklung die dreifachen Windungszahlen der Wicklungs-The composition of the vectors will of course only have the correct value for the phase zero point voltage result when the voltages of the individual windings stand in a corresponding relationship to each other, since only then is the condition of the main claim fulfilled that the zero point earth voltage in the case of a full conductor earth fault, its size is equal to the phase zero point voltage. This is achieved by that the winding parts of the star winding have three times the number of turns of the winding
ao teile der Dreieckswicklung nach Abb. 1 oder jeder der auf den Ausgleichsschenkeln angeordneten Wicklungen nach Abb. 2 erhalten. Für den Wandler der Abb. 2 wird man zweckmäßig zur Gewinnung der Nullpunktserdspannung eine Anzapfung an der Wicklung auf den Ausgleichsschenkeln verwenden, dieao parts of the triangular winding according to Fig. 1 or each of the arranged on the compensating legs Obtained windings according to Fig. 2. For the converter of Fig. 2, it is useful to obtain the zero point earth voltage use a tap on the winding on the compensating legs that
bei sattem Erdschluß eine Spannung 77= · derwith a full earth fault a voltage 77 = · der
V3 verketteten Spannung an der Sternwicklung liefert. Die gesamte Wicklung kann dann so ausgebildet werden, daß sie eine Spannung liefert, die bei einem satten Leitererdschluß gleich der verketteten. Spannung ist. Hierdurch läßt sich die Bedingung der Normalien einhalten, daß beide Spannungen (verkettete SpannungundNuUpunktserdspannung an der gesamten Ausgleichsschenkelwicklung) = 100 Volt betragen. Der Anzapfpunkt liegt dann bei sattem Erdschluß bei einer Spannung -7= Volt. V3 supplies a line-to-line voltage on the star winding. The entire winding can then be designed in such a way that it supplies a voltage which, in the case of a full conductor earth fault, is equal to the concatenated one. Tension is. This allows the condition of the standards that both voltages (line-to-line voltage and zero point ground voltage on the entire compensating leg winding) are = 100 volts. The tap point is then with a full earth fault at a voltage of -7 = volts.
(/3(/ 3
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA74140D DE639823C (en) | 1934-09-19 | 1934-09-19 | Measuring and protective device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA74140D DE639823C (en) | 1934-09-19 | 1934-09-19 | Measuring and protective device |
Publications (1)
Publication Number | Publication Date |
---|---|
DE639823C true DE639823C (en) | 1936-12-14 |
Family
ID=6946064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA74140D Expired DE639823C (en) | 1934-09-19 | 1934-09-19 | Measuring and protective device |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE639823C (en) |
-
1934
- 1934-09-19 DE DEA74140D patent/DE639823C/en not_active Expired
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