DE506859C - Interturn protection for electrical machines, transformers and apparatus - Google Patents
Interturn protection for electrical machines, transformers and apparatusInfo
- Publication number
- DE506859C DE506859C DES89724D DES0089724D DE506859C DE 506859 C DE506859 C DE 506859C DE S89724 D DES89724 D DE S89724D DE S0089724 D DES0089724 D DE S0089724D DE 506859 C DE506859 C DE 506859C
- Authority
- DE
- Germany
- Prior art keywords
- relay
- current
- additional
- interturn
- transformers
- 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 6
- 230000007935 neutral effect Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
- H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/286—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus involving comparison of similar homopolar quantities
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
Der Windungsschlußschutz für elektrische Maschinen, Transformatoren und Apparate mittels Stützdrosseln bereitet häufig dadurch Schwierigkeiten, daß eine Sternpunktsverlagerung nicht nur bei Windungsschluß, sondern auch bei stark unsymmetrischer Belastung, insbesondere bei zweipoligem Kurzschluß, auftritt. Untersuchungen haben gezeigt, daß diese Sternpunktsverlagerung auf ίο den Einfluß des rückläufigen Drehfeldes zurückgeführt werden kann. Insbesondere wird durch dieses rückläufige Drehfeld bei elektrischen Maschinen eine Welligkeit des Erregerstromes hervorgerufen. Erfindungsgemäß wird daher der Einfluß dieses rückläufigen Drehfeldes dadurch aufgehoben, daß dem den Windungsschluß anzeigenden Relais ein geeigneter Zusatzstrom bzw. eine geeignete Zusatzspannung in Abhängigkeit von der Größe des rückläufigen Drehfeldes zugeführt wird. Mit Hilfe bekannter Schaltungen, welche einen der Größe des rückläufigen Drehfeldes entsprechenden Zusatzstrom oder Zusatzspannung herzustellen gestatten, gelingt es so, den Einfluß der Sternpunktsverlagerung im Relais selbst wieder zu kompensieren.The interturn protection for electrical machines, transformers and apparatus by means of support throttles often causes difficulties in that a neutral point shift not only with interturn faults, but also with highly asymmetrical loads, especially with a two-pole short circuit, occurs. Investigations have shown that this neutral point shift is due to the influence of the declining rotating field can be. In particular, this declining rotating field in the case of electrical Machines caused a ripple in the excitation current. According to the invention therefore the influence of this declining rotating field is canceled by the fact that the Winding fault indicating relay a suitable additional current or a suitable additional voltage is supplied depending on the size of the declining rotating field. With the help of known circuits which an additional current or additional voltage corresponding to the size of the declining rotating field allow to produce, it is possible to compensate for the influence of the neutral point shift in the relay itself.
Die Zeichnung zeigt Ausführungsbeispiele der Erfindung. Gemäß Abb. 1 wird der Windungsschluß durch das Stromrelais 2 angezeigt, das bei auftretendem Ausgleichsstrom zwischen dem Sternpunkt der Stützdrossel 3 und dem Sternpunkt der Maschine 4 anspricht. Gemäß der Erfindung wird dem Relais 2 durch die an sich bekannte Stromwandlerschaltung 5 ein zusätzlicher Strom zugeführt, welcher der Größe des rückläufigen Stromsystems proportional ist und durch eine Kunstschaltung 6 von beliebiger an sich bekannter Art nach Größe und Phase einreguliert werden kann.The drawing shows exemplary embodiments of the invention. According to Fig. 1, the interturn short indicated by the current relay 2, which when compensating current occurs responds between the star point of the support throttle 3 and the star point of the machine 4. According to the invention, the relay 2 is provided by the current converter circuit known per se 5 an additional current is supplied, which is proportional to the size of the retrograde current system and through a Art circuit 6 of any type known per se adjusted according to size and phase can be.
Gemäß Abb. 2 wird der Windungsschluß durch das Spannungsrelais 7 angezeigt, das in die offene Dreieckwicklung der Stützdrossel 3 eingeschaltet ist. Erfindungsgemäß wird dem Spannungsrelais 7 eine zusätzliche Spannung durch 'die an sich bekannte Stromwandlerschaltung 5 zugeführt, welche der Größe des rückläufigen Stromsystems proportional ist und durch eine Kunstschaltung 6 beliebiger an sich bekannter Art nach Größe und Phase einreguliert werden kann.According to Fig. 2, the interturn fault is indicated by the voltage relay 7, which is shown in the open delta winding of the support choke 3 is switched on. According to the Voltage relay 7 an additional voltage through 'the current converter circuit known per se 5 supplied, which is proportional to the size of the retrograde current system and by an art circuit 6 arbitrary can be adjusted according to size and phase of a known type.
Außer daß man wie in den. gezeichneten Ausführungsbeispielen die erforderlichen Zusatzströme oder -spannungen dem rückläufigen Strcmsystem entnimmt, ist es selbstverständlich auch möglich, diese dem rückläufigen Spannungssystem nach irgendeiner bekannten Unsymmetrieschaltung zu entnehmen (vgl. z. B. Evans El. World 1923 S. 33 vom 10. November 1923). Vor die den Windungsschluß anzeigenden Relais können selbstverständlich auch noch Sperrkreise oder Drosselketten geschaltet werden, um dadurch die Oberwellen noch weiter abzuhalten. An Stelle das den Windungsschluß anzeigende Relais als normales Strom- oder Spannungsrelais auszuführen, kann man bei einem Windungsschlußschutz für Maschinen auch ein Strom- oder Spannungsrelais verwenden, dessen Empfindlichkeit in Abhängigkeit von der Erregung der Maschine geändert wird.Except that you are like in the. illustrated embodiments the required additional flows takes or voltages from the retrograde flow system, it goes without saying also possible to take this from the declining voltage system after some known unbalance circuit (See e.g. Evans El. World 1923 p. 33 of November 10, 1923). Before the short windings indicating relays can of course also be switched to blocking circuits or choke chains in order to thereby to keep the harmonics even further. Instead of the one indicating the shorted turn Relays can be designed as normal current or voltage relays with interturn protection also use a current or voltage relay for machines, the sensitivity of which depends on the excitation of the machine is changed.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES89724D DE506859C (en) | Interturn protection for electrical machines, transformers and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES89724D DE506859C (en) | Interturn protection for electrical machines, transformers and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE506859C true DE506859C (en) | 1930-09-09 |
Family
ID=7515306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES89724D Expired DE506859C (en) | Interturn protection for electrical machines, transformers and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE506859C (en) |
-
0
- DE DES89724D patent/DE506859C/en not_active Expired
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