WO2015071422A1 - Appareil de surveillance de traversées-condensateurs - Google Patents

Appareil de surveillance de traversées-condensateurs Download PDF

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Publication number
WO2015071422A1
WO2015071422A1 PCT/EP2014/074629 EP2014074629W WO2015071422A1 WO 2015071422 A1 WO2015071422 A1 WO 2015071422A1 EP 2014074629 W EP2014074629 W EP 2014074629W WO 2015071422 A1 WO2015071422 A1 WO 2015071422A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
transformer
capacitor
voltage
measurand
Prior art date
Application number
PCT/EP2014/074629
Other languages
English (en)
Inventor
Junliang WU
Karsten Viereck
Ulrich Sundermann
Uwe Kaltenborn
Original Assignee
Maschinenfabrik Reinhausen Gmbh
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 Maschinenfabrik Reinhausen Gmbh filed Critical Maschinenfabrik Reinhausen Gmbh
Publication of WO2015071422A1 publication Critical patent/WO2015071422A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/35—Feed-through capacitors or anti-noise capacitors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
    • 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
    • G01R31/64—Testing of capacitors
    • 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
    • G01R31/62—Testing of transformers

Definitions

  • the invention relates to an apparatus for monitoring a capacitor bushing of a transformer.
  • DE 100 37 432 A1 describes a method and an apparatus for monitoring a capacitor bushing that is supplied with an electrical operating voltage, in which capacitor bushing an electrically conductive insert forms a voltage divider.
  • At least one measured value of an electrical measurand is sensed and stored using a measuring tap connected with the insert and ground potential, wherein the impedance between the measuring tap and the ground potential is changed after sensing the at least one measured value, and at least one signal value of a then forming measurement signal is sensed and stored using the measuring tap and the ground potential, wherein the time distance between the time of sensing the one measured value and the time of sensing the one signal value is determined such that potential changes in the operating voltage between the two points in time can be neglected, wherein a parameter is calculated by forming the quotient of the measured value and the signal value, which parameter is compared with a predefined setpoint, and wherein a status signal displaying a failure of the capacitor bushing is produced when the parameter deviates from the predefined setpoint.
  • a measuring tap connected with the insert is provided, which measuring tap is connected with a measuring device for sensing an electrical measurand, wherein the impedance existing between the measuring tap and the ground potential comprises an impedance arrangement that is associated with a switching device.
  • the impedance arrangement has a fixed impedance, which is connectible with the measuring tap or disconnectible from the measuring tap via a switching device.
  • the switching device is connected with a control device.
  • the impedance arrangement is initially in a first measuring state, in which the switching device is open and the fixed impedance is not connected with the measuring tap. In this first measuring state, a measured value of an electrical measurand is sensed and stored in a memory in the measuring device at a first point in time.
  • the measurand is the applied electrical voltage to ground potential at the measuring tap.
  • the impedance is formed by the parallel connection of the capacity and the internal resistance of the measuring device.
  • the impedance in this measur- ing state is referred to as unchanged impedance.
  • the switching device controls the control device and switches it to the closed state.
  • the fixed impedance is thereby connected electrically conductive with the measuring tap.
  • the im- pedance is now formed by the parallel connection of the capacity, the internal resistance of the measuring device, and the fixed impedance.
  • a signal value of a forming measurement signal is now sensed and also stored by means of the measuring device at a second point in time.
  • the measurement signal is the applied electrical voltage to ground potential at the measuring tap.
  • the impedance in this second measuring state is referred to as changed impedance.
  • the object of the invention is to create an apparatus for monitoring a capacitor bushing of a transformer and a system for monitoring capacitor bushings of a multi-phase transformer, which apparatus and system allow improved monitoring.
  • an apparatus for monitoring a capacitor bushing of a transformer comprising
  • a measuring adapter which can be connected with the insert, and which is connected with the measuring device for the purpose of sensing and/or measuring a first electrical measurand;
  • a voltage transformer which can be connected with the power line for the purpose of sensing and/or measuring a second electrical measurand, and which is connect- ed with the evaluation device for the purpose of transmitting the second measurand to the evaluation device.
  • the second measurand sensed by the voltage transformer at the power line it is possible to sense and/or detect temporal changes and/or fluctuations of the operating voltage, for instance transient phenomena or asymmetries, which can be compared, for instance, with the first measurands sensed by the measuring device at the capacitor bushing. Reliable monitoring of the capacitor bushing is thereby ensured in consideration and evaluation of the changes and/or fluctuations of the line voltage and the operating voltage.
  • the proposed apparatus can be constructed in any manner and can have, for instance, at least one further measuring device and/or at least one further measuring adapter and/or at least one further evaluation device and/or at least one further voltage transformer.
  • the transformer can be constructed in any manner as required, for instance as a one- or multi-phase transformer, in particular a three-phase power transformer or high-voltage transformer.
  • the power line can be constructed in any manner as required, for instance by way of a high-voltage line.
  • the voltage transformer is constructed as a capacitive voltage transformer or as an inductive voltage transformer or as a resistive voltage transformer.
  • the voltage transformer can be constructed in any manner and/or can become or be realized by means of different suitable principles. It can be designed to be, for instance, inductive and/or capacitive and/or resistive, and/or it can have inductive and/or capacitive and/or resistive components and/or parts. Preferably, it can have a capacitive voltage divider with two serially connected capacitors, and two coils or windings connected by way of a transformer for inductive galvanic isolation.
  • the measuring device has a measuring capacitor.
  • the capacity of the measuring capacitor is preferably many times greater than the capaci- ty of the external capacitor.
  • the first measurand is a voltage applied at a lower voltage capacitor.
  • the second measurand is a voltage applied between the power line and the ground potential.
  • each capacitor bushing comprising
  • measuring adapter for each phase, which measuring adapter can be connected with the insert of the capacitor bushing belonging to the respective phase, and which measuring adapter is connected with the measuring device for the purpose of sensing and/or measuring a first electrical measurand;
  • an overall evaluation device which is connected with the measuring device for the purpose of transmitting the first measurands to the overall evaluation device;
  • a voltage transformer for each phase which voltage transformer can be connected with the power line belonging to the respective phase for the purpose of sensing and/or measuring a second electrical measurand, and which voltage transformer is connected with the overall evaluation device for the purpose of transmitting the second measurand to the overall evaluation device.
  • the system proposed according to the second aspect can be constructed in any manner as required and can have, for instance, at least one further measuring device and/or at least one further measuring adapter and/or at least one further voltage transformer. It is for instance possible to provide a separate measuring device for each measuring adapter. Alternatively, the measuring device can be constructed as a collective measuring device for at least two or for all measuring adapters.
  • the overall evaluation device can be constructed in any manner as required, for instance as a collective overall evaluation device for at least two or for all measuring devices and/or for at least two or for all voltage transformers. Alternatively or additionally it can have, for instance, a superordinate evaluation device and for each phase a separate subordinate evaluation device, which is connected with the measuring device belonging to the respective phase, with the voltage transformer belonging to the respective phase, and with the superordinate evaluation device.
  • the proposed system has a measuring device and an evaluation device for each phase and that the measuring device, the measuring adapter, the evaluation device, and the voltage transformer of each phase form one of the apparatuses proposed according to the first aspect and associated with the respective phase, or form a part of one of the apparatuses proposed according to the first aspect and associated with the respective phase, or belong to one of the apparatuses proposed according to the first aspect and associated with the respective phase.
  • each capacitor bushing comprising
  • a conductor which is connected with one of the windings of the transformer at its one end and with one of the power lines of the alternating current network at its other end, and
  • the measuring adapter of which apparatus can be connected with the insert of the capacitor bushing belonging to the respective phase, and the voltage transformer of which apparatus can be connected with the power line belonging to the respective phase;
  • the system proposed according to the third aspect can be constructed in any manner as required, for instance such that the evaluation devices of the apparatuses and the super- ordinate evaluation device are combined to form one common overall evaluation device.
  • Each of the systems proposed according to the second or third aspect allows the use of voltage transformers that have relatively large measuring tolerances and/or measuring accuracies, and which preferably belong to the same tolerance class and/or accuracy class and are, in particular, identical in construction.
  • FIG. 1 an embodiment of an apparatus for monitoring a capacitor bushing of a transformer
  • FIG. 2 a switching circuit from a lower voltage capacitor and an upper voltage capacitor
  • FIG. 3 an embodiment of a system for monitoring three capacitor bushings of a three-phase transformer.
  • FIG. 1 shows an embodiment of a system 1 for monitoring a capacitor bushing 2 of a transformer, which is not illustrated here, and which in this instance takes the exemplary form of a high-voltage transformer.
  • capacitor bushings 2 are used for high voltages that range from a few kV up to some 1000 kV, for example.
  • the capacitor bushing 2 has an insulating body 1 1 , through the inside of which a conductor 4 is led. This conductor 4 contacts a power line at its upper end, which power line takes the exemplary form of a high-voltage line 5, and at its lower end a winding of the high-voltage transformer, which is not illustrated here.
  • the flange 12 serves the purpose of fastening the capacitor bushing 2.
  • a measuring adapter 6 is arranged at the capacitor bushing 2. This measuring adapter 6 penetrates the insulating body 1 1 and produces an electrically conductive connection to the outermost insert 3.
  • the measuring adapter 6 is connected electrically conductively with an evaluation device or an evaluation unit 8 via a measuring device or a measuring unit 7 for the purpose of transmitting a first electrical measurand M1 to the evaluation unit 8.
  • the measuring unit 7 has a measuring capacitor KM with a capacity CM, which is switched to the ground potential 13, and it can additionally have a spark gap, as required, connected in parallel to the measuring capacitor KM, and/or an overvoltage protection connected in parallel to the measuring capacitor.
  • the parallel connection of the measuring capacitor KM and the external capacitor KA forms a lower voltage capacitor KU with the capacity C1 , which is also referred to as lower capacity C1 .
  • the first measurand M1 is the voltage U1 , which is tapped between the lower voltage capacitor KU and the upper voltage capacitor KO and is referenced to the ground potential 13 and thus applied to the lower voltage capacitor KU. This is shown in FIG. 2.
  • the evaluation unit 8 is connected electrically conductively with the high-voltage line 5 via a voltage transformer 9. In this way, a second electrical measurand M2 is sensed and transmitted to the evaluation unit 8.
  • the measurand M2 is the voltage Ua, which is applied between the high-voltage line 5 and the ground potential 13.
  • the voltage transformer 9 has a capacitive voltage divider in this embodiment, which voltage divider has two capacitors K1 , K2 connected in series, and two coils or windings W1 , W2, which are connected by way of a transformer for inductive galvanic isolation.
  • the apparatus 1 offers the possibility that the evaluation unit 8 uses the second measurand M2 when processing the first measurand M1 in order to take into account the fluctuations and/or asymmetries in the high-voltage line, which lead to corresponding errors in the first measurand M1.
  • the second measurand M2 can be used as reference for compensating the corresponding errors, for instance, but it can also be included, as required, in processing the first measurand M1 in other ways.
  • the apparatus 1 ensures reliable monitoring of the capacitor bushing 2.
  • FIG. 3 shows an embodiment of a system 10 for monitoring three capacitor bushings 2a, 2b, 2c of a three-phase transformer, which is not illustrated here, for a three-phase alternating voltage network Pa, Pb, Pc.
  • a measuring adapter 6 and a measuring unit 7 are connected at each capacitor bushing 2a, 2b, 2c, and a voltage transformer 9 is respectively arranged at each high-voltage line 5 of the respective phase Pa, Pb, Pc. All voltage transformers 9 and measuring units 7 are connected with one common overall evaluation device or overall evaluation unit 8'.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

Cette invention concerne un appareil (1) de surveillance d'une traversée-condensateur (2) d'un transformateur, ladite traversée-condensateur (2) comprenant un conducteur (4) qui est connecté à un enroulement du transformateur par une première extrémité et à une ligne électrique (5) par son autre extrémité, ainsi qu'une pièce rapportée conductrice (3) entourant le conducteur (4). Ledit appareil (1) comprend un dispositif de mesure (7) ; un adaptateur de mesure (6) qui peut être connecté à la pièce rapportée (3) et qui est connecté au dispositif de mesure (7) afin de détecter une première mesure électrique (M1) ; un dispositif d'évaluation (8) qui est connecté au dispositif de mesure (7) afin de transmettre la première mesure (M1) au dispositif d'évaluation (8) ; un transformateur de tension (9) qui peut être connecté à la ligne électrique (5) afin de détecter une seconde mesure électrique (M2) et qui est connecté au dispositif d'évaluation (8) afin de transmettre la seconde mesure (M2) au dispositif d'évaluation (8).
PCT/EP2014/074629 2013-11-15 2014-11-14 Appareil de surveillance de traversées-condensateurs WO2015071422A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013112583.2 2013-11-15
DE102013112583 2013-11-15

Publications (1)

Publication Number Publication Date
WO2015071422A1 true WO2015071422A1 (fr) 2015-05-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114661A1 (fr) * 2016-12-20 2018-06-28 Eaton Industries (Netherlands) B.V. Douille à capteur de tension intégré
CN117368621A (zh) * 2023-12-06 2024-01-09 南方电网科学研究院有限责任公司 套管状态监测方法、装置、存储介质及计算机设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012068A1 (de) * 2000-03-14 2001-10-04 Hsp Hochspannungsgeraete Porz Vorrichtung und Verfahren zur Überwachung einer Kondensatordurchführung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012068A1 (de) * 2000-03-14 2001-10-04 Hsp Hochspannungsgeraete Porz Vorrichtung und Verfahren zur Überwachung einer Kondensatordurchführung
DE10037432A1 (de) 2000-03-14 2002-02-14 Hochspannungsgeraete Porz Gmbh Vorrichtung und Verfahren zur Überwachung einer Kondensatordurchführung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SETAYESHMEHR A ET AL: "On-line monitoring and diagnoses of power transformer bushings", IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 13, no. 3, 17 July 2006 (2006-07-17), pages 608 - 615, XP008119554, ISSN: 1070-9878, DOI: 10.1109/TDEI.2006.1657975 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114661A1 (fr) * 2016-12-20 2018-06-28 Eaton Industries (Netherlands) B.V. Douille à capteur de tension intégré
CN117368621A (zh) * 2023-12-06 2024-01-09 南方电网科学研究院有限责任公司 套管状态监测方法、装置、存储介质及计算机设备
CN117368621B (zh) * 2023-12-06 2024-02-23 南方电网科学研究院有限责任公司 套管状态监测方法、装置、存储介质及计算机设备

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