DE3706932A1 - Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement - Google Patents

Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement

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Publication number
DE3706932A1
DE3706932A1 DE19873706932 DE3706932A DE3706932A1 DE 3706932 A1 DE3706932 A1 DE 3706932A1 DE 19873706932 DE19873706932 DE 19873706932 DE 3706932 A DE3706932 A DE 3706932A DE 3706932 A1 DE3706932 A1 DE 3706932A1
Authority
DE
Germany
Prior art keywords
earth
rectifier
fault
currents
synchronous machine
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.)
Granted
Application number
DE19873706932
Other languages
German (de)
Other versions
DE3706932C2 (en
Inventor
Juergen Dipl Ing Trost
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TROST, JUERGEN, DIPL.-ING., 3167 BURGDORF, DE
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19873706932 priority Critical patent/DE3706932A1/en
Publication of DE3706932A1 publication Critical patent/DE3706932A1/en
Application granted granted Critical
Publication of DE3706932C2 publication Critical patent/DE3706932C2/de
Granted legal-status Critical Current

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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
    • H02H3/16—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 fault current to earth, frame or mass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Synchronous Machinery (AREA)

Abstract

The quantitative detection of shorts to earth in rotors of synchronous machines has previously required measuring brushes for applying auxiliary voltages to the rotor. Furthermore, it was previously not possible to provide information relating to the location of the fault in the machine. The detection of the resistance of the short to earth is carried out by means of two current measuring points which are connected alternately to the exciter circuit. The direct-current evaluation of the earthing currents measured in this way provides information on the size of the resistance of the short to earth and the location of a fault. Short to earth of rotors of synchronous machines.

Description

Die Erfindung betrifft eine Vorrichtung zur hilfsspannungsfreien, quantitativen Erfassung des Isolationswiderstandes von gleichrichtergespeisten, potentialfrei angeordneten Erregereinrichtungen in Synchronmaschinen mit der Möglichkeit der Fehlerortbestimmung.The invention relates to a device for auxiliary voltage-free, quantitative measurement of the insulation resistance of rectifier powered, potential free arranged Excitation devices in synchronous machines with the possibility of Fault location.

Die Erfindung ordnet sich ein in das Gebiet der Schutzeinrichtungen für elektrische Maschinen im Allgemeinen und der Rotorerdschlußüberwachung im Speziellen.The invention falls into the field of Protective devices for electrical machines in general and rotor earth fault monitoring in particular.

Zur Erfassung von Erdschlüssen im Läufer elektrischer Maschinen sind verschiedene Verfahren bekannt. Zum einenFor detecting earth faults in the rotor of electrical machines various methods are known. On the one hand

  • a) Verfahren zur quantitativen Bestimmung des Isolationswider­ standes durch Einprägen von Hilfsspannungen nach
    • - Zweistufiger Läufererdschlußschutz hoher Empfindlichkeit für Synchronmaschinen
      Henninger, Knütter, Schmiedel
      Siemens Energietechnik (1979), Heft 11, S. 407-41,
    • - Elektronischer Läufererdschlußschutz mit neuartigem Meßprinzip
      Knütter, Ziegler
      Siemens Zeitschrift (1972) Heft 12,
    • - Wechselstrombrückenschaltung als selektiver Rotorerdschlußschutz
      Kornas
      Bull. SVE/VSE 74 (9183) 23,
    a) Procedure for quantitative determination of the insulation resistance by impressing auxiliary voltages after
    • - Two-stage rotor earth fault protection with high sensitivity for synchronous machines
      Henninger, Knutter, Schmiedel
      Siemens Energietechnik (1979), Issue 11, pp. 407-41,
    • - Electronic rotor earth fault protection with a new measuring principle
      Knütter, Ziegler
      Siemens magazine (1972) issue 12,
    • - AC bridge circuit as selective rotor earth fault protection
      Kornas
      Bull. SVE / VSE 74 (9183) 23,

zum anderenon the other hand

  • b) Verfahren zur qualitativen Erkennung eines Erdschlusses ohne Hilfsspannung nach
    • - Bürstenlose Drehstrom-Synchrongeneratoren für ein Diesel­ kraftwerk
      Barthelmes, Gang, Schneider
      (DK 621 313 322-843.6)
    • - Rotorerdschlußschutz für Synchronmaschinen großer Leistung
      Kornas
      Elektrotechnik und Maschinenbau, Jahrg. 101 (1985), Heft 10
    b) Procedure for the qualitative detection of an earth fault without auxiliary voltage
    • - Brushless three-phase synchronous generators for a diesel power plant
      Barthelmes, gang, tailor
      (DK 621 313 322-843.6)
    • - Rotor earth fault protection for synchronous machines of high performance
      Kornas
      Electrical engineering and mechanical engineering, year 101 (1985), issue 10

Nachteilig bei den unter a) genannten Verfahren ist zum einen die Notwendigkeit von schleifenden Kontakten zur Übertragung der Hilfsspannung auf den Läufer, was insbesondere bei bürstenlos erregten Maschinen einen erheblichen konstruktiven Mehraufwand bedeutet, zum anderen muß in den Meßeinrichtungen Aufwand getrieben werden, um die in der Erregereinrichtung vorhandenen Spannungen von der zur Messung eingeprägten Hilfsspannung zu unterscheiden. Bei den unter b) genannten Verfahren ist eine kontinuierliche Beobachtung der Schadensentwicklung nicht möglich.A disadvantage of the methods mentioned under a) is the one Need for sliding contacts to transfer the Auxiliary voltage on the runner, which is especially the case with brushless excited machines a considerable additional design effort means on the other hand effort in the measuring equipment be driven to the existing in the excitation device Voltages from the auxiliary voltage impressed for the measurement differentiate. In the procedures mentioned under b) is one continuous monitoring of damage development is not possible.

Zur Erfindung führte folgende Aufgabenstellung:The following task led to the invention:

  • - obengenannte Nachteile sollten vermieden werden,- the disadvantages mentioned above should be avoided,
  • - die Funktionsfähigkeit der Erdschlußschutzeinrichtung sollte von Maschinenparametern (insbesondere der Erdkapazität) unabhängig sein,- The functionality of the earth fault protection device should of machine parameters (especially the earth's capacity) be independent,
  • - neue Kriterien zur Schadensbeobachtung sollten geliefert werden.- new criteria for damage monitoring should be provided.

Diese Aufgabenstellung ist erfindungsgemäß wie folgt gelöst.According to the invention, this task is solved as follows.

Nach Anspruch 1 werden Erdströme erfaßt, welche von Anschlüssen der Erregerwicklung gegen die Läufererde fließen. Diese Ströme werden durch Spannungen in der Erregereinrichtung getrieben, wodurch sich der Einsatz einer Hilfsspannung erübrigt.According to claim 1 earth currents are detected, which of connections the excitation winding flow against the rotor earth. These currents are driven by voltages in the excitation device, which makes the use of an auxiliary voltage unnecessary.

Nach Anspruch 2 werden von diesen Erdströmen die Gleichanteile ausgewertet, wodurch der störende Einfluß der Erdkapazität beseitigt wird. According to claim 2 of these earth currents, the DC components evaluated, causing the disruptive influence of earth's capacity is eliminated.  

Nach Anspruch 3 läßt sich durch Vergleich der Gleichanteile der Erdströme der Fehlerort bestimmen, wodurch unter Hinzunahme der quantitativ bestimmten Erdströme eine erweiterte Beobachtung der Schadensentwicklung möglich wird. (Insbesondere kann bei verän­ derlichem Fehlerort auf einen mehrfachen Fehler geschlossen werden).According to claim 3 can be compared by comparing the DC components Earth currents determine the location of the fault, thus taking into account the an extended observation of the quantitatively determined earth currents Damage development becomes possible. (In particular, when changing the fault location is inferred about a multiple fault will).

Besondere Vorteile der Erfindung sind:Particular advantages of the invention are:

  • - Unabhängigkeit von einer Hilfsspannungsquelle- Independence from an auxiliary voltage source
  • - Quantitative Erdschlußwiderstandbestimmung- Quantitative earth fault resistance determination
  • - leichte Nachrüstbarkeit wegen Unabhängigkeit von Maschinenparametern- Easy to retrofit due to independence from Machine parameters
  • - Fehlerorterkennung- fault location detection
AusführungsbeispielEmbodiment

Die Erregereinrichtung von Synchronmaschinen ist üblicherweise wie in Fig. 1 dargestellt aufgebaut.The excitation device of synchronous machines is usually constructed as shown in FIG. 1.

Die Erschlußschutzeinrichtung besteht beispielsweise aus zwei Strommeßstellen SM 1 und SM 2, die wechselweise über Analogschalter S 1 und S 2 zwischen Anschlüsse der Erregerwicklung und Läufererde geschaltet werden. Die dann gemessenen Erdströme I E 1 und I E 2 sind abhängig von der Größe und dem Ort eines Isolationsfehlers R F . In jedem Fall läßt sich aus den Gleichanteilen der Erdströme I E 1 und I E 2 der Betrag des Widerstandes R F (bei mehreren Fehlern der Betrag der Parallelschaltung der Erdschlußwiderstände) berechnen. Bei Gleichheit der Gleichanteile der Erdströme I E 1 und I E 2 liegt der Fehlerort in der Drehstromwicklung oder in der Mitte der Erregerwicklung (Unterscheidung durch Auswertung der Wechselan­ teile möglich). Bei ungleichen Erdströmen I E 1 und I E 2 liegt der Fehlerort in der Erregerwicklung und läßt sich in Prozent der Erregerwicklungslänge l ERR angeben.The access protection device consists, for example, of two current measuring points SM 1 and SM 2 , which are alternately connected via connections S 1 and S 2 between connections of the field winding and rotor earth. The earth currents I E 1 and I E 2 then measured depend on the size and location of an insulation fault R F. In any case, the amount of resistance R F (in the case of several errors, the amount of parallel connection of the earth fault resistors) can be calculated from the equal proportions of earth currents I E 1 and I E 2 . If the direct components of the earth currents I E 1 and I E 2 are equal, the fault location is in the three-phase winding or in the middle of the excitation winding (differentiation possible by evaluating the alternating parts). If the earth currents I E 1 and I E 2 are unequal, the fault location is in the field winding and can be specified as a percentage of the field winding length l ERR .

Claims (3)

1. Anordnung zur hilfsspannungsfreien, quantitativen Erfassung des Isolationswiderstandes zwischen gleichrichtergespeisten, potentialfrei angeordneten Erregereinrichtungen von Syn­ chronmaschinen und der umgebenden Läufererde, dadurch gekennzeichnet, daß Erdströme erfaßt werden, welche wechselweise von zwei Anschlüssen an der Erregerwicklung gegen die Läufererde fließen.1. Arrangement for auxiliary voltage-free, quantitative detection of the insulation resistance between rectifier-fed, potential-free excitation devices of Syn chronmaschinen and the surrounding rotor earth, characterized in that earth currents are detected, which alternately flow from two connections to the field winding against the rotor earth. 2. Verfahren zur quantitativen Erfassung des Isolationswider­ standes nach 1, dadurch gekennzeichnet, daß der Gleichanteil der genannten Erdströme ausgewertet wird.2. Method for quantitative detection of insulation resistance ranked after 1, characterized in that the DC component of the above Earth currents is evaluated. 3. Verfahren zur Erfassung des Isolationsfehlerortes, dadurch gekennzeichnet, daß die unter 2. genannten Gleichan­ teile der Erdströme miteinander verglichen werden.3. Procedure for the detection of the insulation fault location, characterized in that the same under 2 parts of the earth's currents are compared.
DE19873706932 1987-03-04 1987-03-04 Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement Granted DE3706932A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873706932 DE3706932A1 (en) 1987-03-04 1987-03-04 Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873706932 DE3706932A1 (en) 1987-03-04 1987-03-04 Device for protecting against shorts to earth for rectifier-fed synchronous machine exciter device in a potential free arrangement

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Publication Number Publication Date
DE3706932A1 true DE3706932A1 (en) 1988-09-15
DE3706932C2 DE3706932C2 (en) 1990-04-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9210351U1 (en) * 1992-07-31 1992-10-01 Siemens AG, 8000 München Rotor earth fault monitoring device
CN102891474A (en) * 2012-11-02 2013-01-23 南京国电南自美卓控制系统有限公司 One-point grounding protective device of alternating-current and direct-current injection type rotors and protection method thereof
CN112217348A (en) * 2020-09-07 2021-01-12 华能南京金陵发电有限公司 Device and method for eliminating electric corrosion of brushless rotating excitation generator rotor grounding detection slip ring

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD5278A (en) *
DE1513460A1 (en) * 1965-05-08 1969-08-14 Siemens Ag Protective device connected DC and AC voltage systems
AT275640B (en) * 1966-05-10 1969-10-27 Elin Union Ag Short-to-ground display for rotor windings in brushless excited synchronous generators
DE2129458B2 (en) * 1971-06-09 1973-08-30 DEVICE FOR MEASURING THE INSULATION RESISTANCE OF THE RUNNER CIRCUIT OF BRUSHLESS SYNCHRONOUS MACHINES
DE2809596A1 (en) * 1978-03-06 1979-09-20 Merk Gmbh Telefonbau Fried Circuit detecting earth faults in two=wire signal line - has resistor connected to each battery terminal and earthed in turns

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD5278A (en) *
DE1513460A1 (en) * 1965-05-08 1969-08-14 Siemens Ag Protective device connected DC and AC voltage systems
AT275640B (en) * 1966-05-10 1969-10-27 Elin Union Ag Short-to-ground display for rotor windings in brushless excited synchronous generators
DE2129458B2 (en) * 1971-06-09 1973-08-30 DEVICE FOR MEASURING THE INSULATION RESISTANCE OF THE RUNNER CIRCUIT OF BRUSHLESS SYNCHRONOUS MACHINES
DE2809596A1 (en) * 1978-03-06 1979-09-20 Merk Gmbh Telefonbau Fried Circuit detecting earth faults in two=wire signal line - has resistor connected to each battery terminal and earthed in turns

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
E.F. KNÜTTER u.a.: Elektron. Läüuferendschluß- schutz....., In: Siemens-Zeitschrift 46, 1972, H.12, S.906-909 *
Kl. HENNINGER u.a.: Zweistufiger Läuferendschluß- schutz....., In: Siemens-Energietechnik 1, 1979, H.11, S.407-411 *
M. BARTHELMES u.a.: Bürstenlose Drehstrom- Synchrongeneratoren....., In: Techn. Mitt. AEG-Telef., 63, 1973, S.5-8 *
T. KORNAS: Rotorendschlußschutz für Synchron- maschinen...., H.10, S.468-471 *
T. KORNAS: Wechselstrombrückenschaltung als selekt. Rotorendschluß, In: Bull. SEV, 74, 1983, S.1328-1331 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9210351U1 (en) * 1992-07-31 1992-10-01 Siemens AG, 8000 München Rotor earth fault monitoring device
CN102891474A (en) * 2012-11-02 2013-01-23 南京国电南自美卓控制系统有限公司 One-point grounding protective device of alternating-current and direct-current injection type rotors and protection method thereof
CN102891474B (en) * 2012-11-02 2016-03-30 南京国电南自美卓控制系统有限公司 A kind of pouring-in rotor one-point grounding protection device of AC and DC and guard method thereof
CN112217348A (en) * 2020-09-07 2021-01-12 华能南京金陵发电有限公司 Device and method for eliminating electric corrosion of brushless rotating excitation generator rotor grounding detection slip ring

Also Published As

Publication number Publication date
DE3706932C2 (en) 1990-04-12

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: TROST, JUERGEN, DIPL.-ING., 3167 BURGDORF, DE

8125 Change of the main classification

Ipc: H02H 7/06

D2 Grant after examination
8364 No opposition during term of opposition
8330 Complete disclaimer