WO2003044545A1 - Procede de detection d'un contact a la terre survenant a proximite d'un point neutre dans un systeme electrique et dispositif destine a la mise en oeuvre et a l'utilisation de ce procede - Google Patents

Procede de detection d'un contact a la terre survenant a proximite d'un point neutre dans un systeme electrique et dispositif destine a la mise en oeuvre et a l'utilisation de ce procede Download PDF

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Publication number
WO2003044545A1
WO2003044545A1 PCT/CH2002/000611 CH0200611W WO03044545A1 WO 2003044545 A1 WO2003044545 A1 WO 2003044545A1 CH 0200611 W CH0200611 W CH 0200611W WO 03044545 A1 WO03044545 A1 WO 03044545A1
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WO
WIPO (PCT)
Prior art keywords
neutral point
windings
measured
phase currents
earth fault
Prior art date
Application number
PCT/CH2002/000611
Other languages
German (de)
English (en)
Inventor
Göran LINDAHL
Erland Sörensen
Original Assignee
Alstom Technology Ltd
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 Alstom Technology Ltd filed Critical Alstom Technology Ltd
Priority to AU2002336884A priority Critical patent/AU2002336884A1/en
Publication of WO2003044545A1 publication Critical patent/WO2003044545A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/346—Testing of armature or field windings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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

Definitions

  • the present invention relates to the field of protection technology for electrical devices such as electrical machines or transformers. It relates to a method for detecting an earth fault occurring in the vicinity of a neutral point in a multiphase electrical device operated at a fundamental frequency. It also relates to an apparatus for carrying out the method and an application of the method. STATE OF THE ART
  • the earth fault protection of a generator based on an overvoltage or overcurrent determination results in simple and reliable protection.
  • earth faults that occur in the windings near the neutral point of the generator are not detected.
  • It has therefore already been proposed (Charles S. Mozina, Upgrading Hydroelectric Generator Protection Using Digital Technology, Waterpower '97, Atlanta GA, August 5-8 (1997)) to achieve a 100% earth fault protection by using a conventional surge protection circuit (for 95% of the stator winding) combined with an undervoltage protection circuit tuned to the third harmonic of the generator fundamental frequency (for the remaining 5% of the winding close to the neutral point).
  • the object is achieved by the entirety of the features of claims 1 and 7.
  • the essence of the invention is to measure higher harmonics of the phase currents flowing between the windings and the neutral point according to direction and size, and to infer the occurrence of an earth fault from the measured direction and size of the phase currents.
  • the measured phase currents can be compared with one another in pairs, in particular the measured phase currents are added in pairs and the presence of an earth fault is derived from the change in the sums formed.
  • a preferred embodiment of the device according to the invention is characterized in that second current transformers are arranged within the windings, that the outputs of the second current transformers are likewise connected to the evaluation unit, and that the evaluation unit is a differential current protection circuit.
  • the method according to the invention is used to protect an electrical device or machine from earth faults.
  • Figure 1 shows a schematic representation of a first embodiment of a device according to the invention for earth fault detection by directionally sensitive comparison of different phase currents.
  • Fig. 2 shows a schematic representation of a second embodiment of a device according to the invention for earth fault detection by differential current measurement within the phases.
  • a possible earth fault is detected by a directionally sensitive current measurement of higher harmonics of those currents which are caused by corresponding higher harmonic voltages (for example the third harmonic E 3 ) induced in the windings.
  • FIG. 1 shows a schematic illustration of a first exemplary embodiment of a device according to the invention for detecting earth faults in the windings 11, 12 and 13 of an electrical machine 10.
  • the windings 11, 12, 13 made with high-voltage cables are directly connected to a network (not shown) on one side via network connections 14, 15 and 16.
  • the windings 11, 12 and 13 are connected to a neutral point 22, which can be connected to earth via switches S1, .., S3 either directly, via a resistor 24 or via a filter 25.
  • the windings 11, 12 and 13 have earth capacitances 17 distributed with respect to earth, which are indicated in FIG. 1.
  • a current transformer 19, 20, 21 is arranged in each of the phases R, S and T, the output of which is connected to an evaluation unit 23.
  • the current transformers 19, 20, 21 then measure the third harmonic I 03R , I O3S , l 03 ⁇ of the phase currents .
  • other harmonics can also be used.
  • the capacitive harmonic currents I 03 R and I 03S of the phases not affected circulate in a closed loop, which is formed by the reactance Zx between the neutral point 22 and the location of the earth fault 18 and the reactance of the earth fault itself becomes. Because of the above-mentioned closed loop, the size and direction of the third harmonic phase current I 03 ⁇ in the phase affected by the earth fault (winding 13) differ from the corresponding values in the phases not affected.
  • the neutral point 22 of a rotating machine is either open or grounded via a high impedance, so that an earth fault current to be expected will be small in the fundamental frequency if the earth fault is close to the neutral point. If the three phase currents I03R, IO 3 S, I O3 T measured with the current transformers are added together in pairs in the evaluation unit, it immediately results that one of the sums (I 03 R + lo3s) increases, while the other two sums (I03R + Remove I0 3T and I03R + lo3 ⁇ ). From this it is possible to conclusively conclude the winding in which the earth fault occurs.
  • FIG. 2 shows a schematic representation of a second exemplary embodiment of a device according to the invention for current direction sensitive earth fault detection in the windings 11, 12 and 13 of an electrical machine 10.
  • differential protection is used which is based on current measurements with a first set of current transformers 19,... 21, which is arranged between the windings 11, 12, 13 and the neutral point 22, and a second set of current transformers 26,. ., 28, which are arranged within the windings 11, 12, 13, is based.
  • the capacitive harmonic currents measured in the two current transformer sets 19, .., 21 and 26, .., 28 are fed to a differential current protection circuit 29. If there is no earth fault, the currents measured in both sets are the same. If there is an earth fault, there is a non-zero difference that can be evaluated to protect the machine 10.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

L'invention concerne un procédé de détection d'un contact à la terre (18) survenant à proximité d'un point neutre (22) dans un système électrique multiphase exploité à une fréquence de base, notamment une machine électrique (10) ou un transformateur, présentant une pluralité d'enroulements (11, 12, 13) affectés aux phases individuelles, lesdits enroulements étant connectés au point neutre (22) sur une extrémité et directement à un réseau électrique sur l'autre extrémité, par l'intermédiaire d'une connexion réseau (14, 15, 16). L'invention vise à mettre en oeuvre une détection simple et fiable. A cet effet, on mesure le sens et la grandeur d'une harmonique supérieure des flux de phase (I?03R#191, I?03S#191, I?03T#191) s'écoulant entre les enroulements (11, 12, 13) et le point neutre (22), et la présence d'un contact à la terre (18) est détectée à partir du sens et de la grandeur mesurés des flux de phase (I?03R#191, I?03S#191, I?03T#191).
PCT/CH2002/000611 2001-11-19 2002-11-14 Procede de detection d'un contact a la terre survenant a proximite d'un point neutre dans un systeme electrique et dispositif destine a la mise en oeuvre et a l'utilisation de ce procede WO2003044545A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002336884A AU2002336884A1 (en) 2001-11-19 2002-11-14 Method for the detection of an earth connection occurring in the vicinity of a neutral point in an electrical device, device for carrying out and application of said method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH21142001 2001-11-19
CH2114/01 2001-11-19

Publications (1)

Publication Number Publication Date
WO2003044545A1 true WO2003044545A1 (fr) 2003-05-30

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PCT/CH2002/000611 WO2003044545A1 (fr) 2001-11-19 2002-11-14 Procede de detection d'un contact a la terre survenant a proximite d'un point neutre dans un systeme electrique et dispositif destine a la mise en oeuvre et a l'utilisation de ce procede

Country Status (2)

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AU (1) AU2002336884A1 (fr)
WO (1) WO2003044545A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100349347C (zh) * 2005-03-18 2007-11-14 清华大学 大型汽轮发电机中性点引出方式及保护配置方法
CN102269787A (zh) * 2011-05-16 2011-12-07 国网电力科学研究院 电子式电压互感器谐波特性检测方法及其检测装置
EP2501009A1 (fr) * 2011-03-10 2012-09-19 Hitachi, Ltd. Machine rotative électrique
WO2013184332A1 (fr) * 2012-06-04 2013-12-12 Eaton Corporation Système et procédé de détection et protection de panne de mise à la terre à haute résistance dans des systèmes de distribution électrique
CN103513150A (zh) * 2013-09-17 2014-01-15 广东电网公司东莞供电局 电力系统电压互感器多点接地的检测装置及方法

Citations (12)

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Publication number Priority date Publication date Assignee Title
DE375233C (de) * 1920-11-07 1923-05-09 Bbc Brown Boveri & Cie Einrichtung zum Schutz von Wechselstromgeneratoren mit zwei parallelen Wicklungssystemen beim Auftreten von Fehlerstellen innerhalb des Generators
CH232756A (de) * 1943-02-16 1944-06-15 Bbc Brown Boveri & Cie Einrichtung zur Erfassung von Erdschlüssen in Drehstromgeneratoren.
DE844192C (de) * 1942-11-04 1952-07-17 Brown Ag Einrichtung zum selektiven Erdschlussschutz von Wechselstrom-Generatoren
DE2002777A1 (de) * 1970-01-19 1971-08-05 Villamosenergiaipari Ki Auf dem Vergleich von dritten harmonischen Spannungen beruhender Koerperschlussschutz fuer Generatoren in Einheitsschaltung
GB1280704A (en) * 1968-09-03 1972-07-05 Bbc Brown Boveri & Cie Improvements relating to the protection of three-phase alternators
DE2803966A1 (de) * 1978-01-30 1979-08-02 Struever Kg Ad Anordnung zur ueberwachung eines stromnetzes
JPS5717870A (en) * 1980-07-08 1982-01-29 Nissin Electric Co Ltd Coil turn short circuit detection method of electromagnetic induction device
US4667262A (en) * 1983-06-22 1987-05-19 Bbc Brown, Boveri & Company, Limited Device for detecting a ground fault in the rotor winding of an electric machine
DE3928551A1 (de) * 1989-08-29 1991-03-07 Siemens Ag Schaltungsanordnung zum erfassen von erdschluessen und windungsschluessen an einer drehstrommaschine
US5006769A (en) * 1989-04-05 1991-04-09 Asea Brown Boveri Ltd. Arrangement for detecting winding shorts in the rotor winding of electrical machines
US5049815A (en) * 1990-04-20 1991-09-17 General Electric Company Spectral analysis of induction motor current to detect rotor faults with reduced false alarms
EP0671632A2 (fr) * 1994-02-25 1995-09-13 Kabushiki Kaisha Toshiba Détecteur de court-circuit à la masse et relais de protection pour un enroulement d'excitation

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE375233C (de) * 1920-11-07 1923-05-09 Bbc Brown Boveri & Cie Einrichtung zum Schutz von Wechselstromgeneratoren mit zwei parallelen Wicklungssystemen beim Auftreten von Fehlerstellen innerhalb des Generators
DE844192C (de) * 1942-11-04 1952-07-17 Brown Ag Einrichtung zum selektiven Erdschlussschutz von Wechselstrom-Generatoren
CH232756A (de) * 1943-02-16 1944-06-15 Bbc Brown Boveri & Cie Einrichtung zur Erfassung von Erdschlüssen in Drehstromgeneratoren.
GB1280704A (en) * 1968-09-03 1972-07-05 Bbc Brown Boveri & Cie Improvements relating to the protection of three-phase alternators
DE2002777A1 (de) * 1970-01-19 1971-08-05 Villamosenergiaipari Ki Auf dem Vergleich von dritten harmonischen Spannungen beruhender Koerperschlussschutz fuer Generatoren in Einheitsschaltung
DE2803966A1 (de) * 1978-01-30 1979-08-02 Struever Kg Ad Anordnung zur ueberwachung eines stromnetzes
JPS5717870A (en) * 1980-07-08 1982-01-29 Nissin Electric Co Ltd Coil turn short circuit detection method of electromagnetic induction device
US4667262A (en) * 1983-06-22 1987-05-19 Bbc Brown, Boveri & Company, Limited Device for detecting a ground fault in the rotor winding of an electric machine
US5006769A (en) * 1989-04-05 1991-04-09 Asea Brown Boveri Ltd. Arrangement for detecting winding shorts in the rotor winding of electrical machines
DE3928551A1 (de) * 1989-08-29 1991-03-07 Siemens Ag Schaltungsanordnung zum erfassen von erdschluessen und windungsschluessen an einer drehstrommaschine
US5049815A (en) * 1990-04-20 1991-09-17 General Electric Company Spectral analysis of induction motor current to detect rotor faults with reduced false alarms
EP0671632A2 (fr) * 1994-02-25 1995-09-13 Kabushiki Kaisha Toshiba Détecteur de court-circuit à la masse et relais de protection pour un enroulement d'excitation

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MOZINA C J: "UPGRADING HYDROELECTRIC GENERATOR PROTECTION USING DIGITAL TECHNOLOGY", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON HYDROPOWER, XX, XX, vol. 1, 5 August 1997 (1997-08-05), pages 713 - 722, XP001066565 *
MOZINA C J: "Upgrading the protection of industrial-sized generators using digital technology", INDUSTRY APPLICATIONS CONFERENCE, 1996. THIRTY-FIRST IAS ANNUAL MEETING, IAS '96., CONFERENCE RECORD OF THE 1996 IEEE SAN DIEGO, CA, USA 6-10 OCT. 1996, NEW YORK, NY, USA,IEEE, US, 6 October 1996 (1996-10-06), pages 2283 - 2290, XP010201365, ISBN: 0-7803-3544-9 *
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100349347C (zh) * 2005-03-18 2007-11-14 清华大学 大型汽轮发电机中性点引出方式及保护配置方法
EP2501009A1 (fr) * 2011-03-10 2012-09-19 Hitachi, Ltd. Machine rotative électrique
JP2012189403A (ja) * 2011-03-10 2012-10-04 Hitachi Mitsubishi Hydro Corp 回転電機
CN102269787A (zh) * 2011-05-16 2011-12-07 国网电力科学研究院 电子式电压互感器谐波特性检测方法及其检测装置
WO2013184332A1 (fr) * 2012-06-04 2013-12-12 Eaton Corporation Système et procédé de détection et protection de panne de mise à la terre à haute résistance dans des systèmes de distribution électrique
CN104364989A (zh) * 2012-06-04 2015-02-18 伊顿公司 用于在配电系统中的高电阻接地故障检测和保护的系统和方法
US9046560B2 (en) 2012-06-04 2015-06-02 Eaton Corporation System and method for high resistance ground fault detection and protection in power distribution systems
CN104364989B (zh) * 2012-06-04 2017-11-21 伊顿公司 用于在配电系统中的高电阻接地故障检测和保护的系统和方法
CN103513150A (zh) * 2013-09-17 2014-01-15 广东电网公司东莞供电局 电力系统电压互感器多点接地的检测装置及方法

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