WO2020094866A1 - Dispositif et procédé de mesure de grandeurs électriques dans un réseau de courant alternatif triphasé - Google Patents

Dispositif et procédé de mesure de grandeurs électriques dans un réseau de courant alternatif triphasé Download PDF

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Publication number
WO2020094866A1
WO2020094866A1 PCT/EP2019/080749 EP2019080749W WO2020094866A1 WO 2020094866 A1 WO2020094866 A1 WO 2020094866A1 EP 2019080749 W EP2019080749 W EP 2019080749W WO 2020094866 A1 WO2020094866 A1 WO 2020094866A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
measuring
flowing
conductor
neutral conductor
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.)
Ceased
Application number
PCT/EP2019/080749
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German (de)
English (en)
Inventor
Florian BERGMANN
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.)
Phoenix Contact GmbH and Co KG
Original Assignee
Phoenix Contact GmbH and Co KG
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 Phoenix Contact GmbH and Co KG filed Critical Phoenix Contact GmbH and Co KG
Publication of WO2020094866A1 publication Critical patent/WO2020094866A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • 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
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • 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
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques

Definitions

  • the invention relates to a measuring device and a method for measuring electrical quantities, in particular for measuring the current of conductors through which current flows
  • the current in the neutral conductor is canceled out when currents of the same current intensity, same phase shift and no harmonic component flow in all three outer conductors. If the current in the outer conductors is unequal, a current flows in the neutral conductor that compensates for the asymmetry and at most reaches the current of the most heavily loaded outer conductor. With different phase shifts of the currents in the outer conductors and / or when
  • harmonics the current in the neutral conductor can also significantly exceed the current of the most heavily loaded outer conductor.
  • the current intensity of the current flowing in the outer conductors LI, L2 and L3 is measured by means of three current sensors 11, 12 and 13 and the current intensity of the current flowing in the neutral conductor from these measured values through totalization
  • Phase conductor currents exceeds, ie I N > I Li , I N > I L2 and I N > I L3 . In extreme cases, this can lead to the current I N destroying the neutral conductor.
  • the invention has for its object to show a way such as a measurement of electrical quantities, in particular a measurement of the current intensity of a through a conductor of a three-phase AC network
  • a key concept of the invention is to be found in a three-phase AC network with three outer conductors and one neutral conductor, the current intensity of the currents flowing in these four conductors being determined with high accuracy and with the aid of only three current sensors, the neutral conductor current and two of the outer conductor currents being measured directly and the third phase current is determined from the measured values, in particular is calculated.
  • a measuring device for measuring electrical quantities in a three-phase alternating current network with three outer conductors and a neutral conductor accordingly comprises a first current sensor for measuring the current strength of a current flowing in a first of the three outer conductors, a second current sensor for measuring the current strength of a current flowing in a second of the three outer conductors and a third current sensor for measuring the current intensity of a current flowing in the neutral conductor. Furthermore, the measuring device includes one with the
  • Evaluation unit connected to current sensors, which is designed to determine the current strength of a current flowing through the third outer conductor from the current strengths measured with the first, second and third current sensors.
  • the measuring device advantageously comprises
  • Measuring lines for measuring the voltage which is present in each case on the three outer conductors and on the neutral conductor, the measuring lines being connected to the evaluation unit.
  • the voltages are preferably measured relative to ground, the three-phase AC network
  • the neutral conductor in particular in addition to the outer conductors and the neutral conductor also includes a ground conductor.
  • the evaluation unit preferably determines or calculates electrical quantities on the basis digital readings. Accordingly, the
  • Evaluation unit is advantageously designed to determine digital current and / or voltage measured values with a predetermined sampling rate.
  • the evaluation unit preferably comprises at least one microprocessor and a memory and can advantageously be part of a measuring device.
  • the measuring device can further comprise a user interface with an input unit and a display, or also a communication interface for communication with a higher-level monitoring device.
  • the measuring device can have its own power supply, for example in the form of a power supply unit or accumulator. It is also conceivable that the energy supply of the
  • Energy is extracted from the magnetic field of the respective current-carrying conductor with the aid of at least one of the current sensors.
  • a method for measuring electrical quantities in a three-phase alternating current network with three outer conductors and one neutral conductor comprises measuring the current intensity of a current flowing in a first of the three outer conductors with a first current sensor, and measuring the
  • FIG. 1 is a schematic representation of a measuring device known from the prior art
  • Fig. 2 is a schematic representation of a first
  • Fig. 3 is a schematic representation of a second
  • FIG. 1 shows a measuring device 10 with three on it
  • the calculated current of the neutral conductor current is only an accuracy of ⁇ 1 A due to the measurement accuracy of the
  • phase conductor currents To use current sensors, whereby the neutral conductor current is measured directly, but one of the phase conductor currents is not measured.
  • the non-measured phase current is calculated from the measured currents of the other two phase currents and
  • FIG. 2 A preferred embodiment of a measuring device 100 according to the invention is exemplified in FIG. 2
  • the measuring device 100 comprises a measuring device 110 with a
  • the current sensor 201 is for measuring the
  • the current sensor 202 is for measuring the
  • the current sensor 203 is for measuring the
  • the evaluation unit 120 is designed to determine the current strength of the current flowing through the third outer conductor L3 from the current strengths measured with the current sensors 201, 202 and 203.
  • the measuring device 100 is thus designed to measure the neutral conductor current directly, but to dispense with the direct measurement of the current flowing through the outer conductor L3 and to calculate it from the measured current strengths. Instead of a direct measurement of the current flowing through the outer conductor L3, it would alternatively also be possible to dispense with a direct measurement of the current flowing through the outer conductor LI or L2.
  • Neutral conductor current can be measured and the third Phase current is calculated based on the measured values.
  • a summary measurement is typically carried out for a specified time window with a duration of in particular 200 ms, wherein a different duration could also be selected.
  • 200 ms is used in particular because it is an integer number of periods for the usual alternating current frequencies of 60 Hz and 50 Hz
  • Samples per second are 100,000 samples per current sensor after a measurement for a measurement duration of 200 ms, which are stored in a memory of the measuring device 110
  • the evaluation unit 120 is advantageously designed to calculate an effective value for I Li , ie for the current strength of the current flowing through the outer conductor LI, using the following formula:
  • the evaluation unit 120 is designed to add an effective value for I Li and I N
  • each channel (LI, L2, N) independently determining 100 k samples based on the signals provided by the current sensors 201, 202 and 203.
  • the evaluation unit 120 is particularly advantageously designed to in each case produce a value for from the measured sample values i Li , i and i N to determine where
  • Evaluation unit 120 also designed to
  • the evaluation unit particularly advantageously determine effective values of the current strength of the currents flowing through the outer conductor and the neutral conductor, but also further electrical variables can be determined from the measured and calculated sample values.
  • measuring lines are preferably used
  • the measuring device 101 comprises a measuring device 111 with an evaluation unit 121, as well as three current sensors 201, 202 and 203.
  • the current sensor 201 is arranged to measure the current intensity of the current flowing through the outer conductor LI of the three-phase alternating current network 400
  • Current sensor 202 is for measuring the
  • Three-phase AC network 400 flowing current is arranged, and the current sensor 203 is for measuring the current intensity through the neutral conductor N des
  • Three-phase alternating current network 400 flowing current arranged.
  • measurement lines 301, 302, 303, 304 and 305 connected to the evaluation unit 121 provided, which are each connected to the outer conductor LI, the outer conductor L2, the outer conductor L3, the neutral conductor N and the ground conductor PE, and which serve to measure the voltage applied to the conductors relative to the ground.
  • the current sensors 201, 202 and 203 shown in FIGS. 2 and 3 can each be designed, for example, as a so-called Rogowski coil and can be designed, for example, as a current probe.
  • any other suitable design of a current sensor is also within the scope of the invention.
  • the evaluation unit 121 can advantageously be designed to determine one or more of the following values:
  • a decisive advantage of the measuring devices 100 and 101 over the prior art is the absolute gain in accuracy with regard to the determined current strength of the neutral conductor current.
  • Neutral conductor N flowing current k index of the samples iLl k kth sample value of the current intensity of the current flowing through the outer conductor Li
  • the neutral value can be the effective value by means of the following
  • Equation can be determined:
  • the error is approximately 0.2% of 1 A and thus up to 2 mA.
  • the reduction of the error from 200 mA to 2 mA corresponds to an improvement by a factor of 100.
  • the error in calculating I L 3 using the method according to the invention differs using the equation given above
  • the evaluation unit is designed, for example, to determine power values using the following equations: through the outer conductor Li, L 2 or L flowing current
  • i LN k kth sample value of the current intensity of the current flowing through the neutral conductor N.
  • the calculated values such as P total and E total refer normatively to a length of ⁇ 200ms.
  • Energy meter function can be provided that the currently determined energy is added up with the previously determined energies.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

Pour une mesure améliorée de grandeurs électriques dans un réseau de courant alternatif triphasé ayant trois conducteurs extérieurs (L1, L2, L3) et un conducteur neutre (N), l'invention fournit un dispositif de mesure (100, 101) comprenant un premier capteur de courant (201) pour mesurer l'intensité d'un courant circulant dans un premier (L1) des trois conducteurs extérieurs, un deuxième capteur de courant (202) pour mesurer l'intensité d'un courant circulant dans un deuxième (L2) des trois conducteurs extérieurs, un troisième capteur de courant (203) pour mesurer l'intensité d'un courant circulant dans le conducteur neutre (N), et une unité d'évaluation (120, 121) reliée aux capteurs de courant (201, 202, 203), l'unité d'évaluation étant conçue pour déterminer l'intensité d'un courant circulant dans le troisième conducteur extérieur (L3) à partir des intensités de courant mesurées avec les premier, deuxième et troisième capteurs de courant.
PCT/EP2019/080749 2018-11-09 2019-11-08 Dispositif et procédé de mesure de grandeurs électriques dans un réseau de courant alternatif triphasé Ceased WO2020094866A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018128050.5 2018-11-09
DE102018128050.5A DE102018128050A1 (de) 2018-11-09 2018-11-09 Messvorrichtung und Verfahren zur Messung elektrischer Größen in einem Dreiphasenwechselstromnetz

Publications (1)

Publication Number Publication Date
WO2020094866A1 true WO2020094866A1 (fr) 2020-05-14

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PCT/EP2019/080749 Ceased WO2020094866A1 (fr) 2018-11-09 2019-11-08 Dispositif et procédé de mesure de grandeurs électriques dans un réseau de courant alternatif triphasé

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WO (1) WO2020094866A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021118187A1 (de) 2021-07-14 2023-01-19 Lisa Dräxlmaier GmbH Ladekabel zum durchführen eines ladevorgangs einer elektrischen speichereinheit

Citations (6)

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Publication number Priority date Publication date Assignee Title
US5444377A (en) * 1992-12-28 1995-08-22 Merlin Gerin Electronic trip device comprising a test device
KR20050095534A (ko) * 2004-12-01 2005-09-29 (주)신우디엔시 영상전류 보상용 3상 전력 계량장치
KR200442726Y1 (ko) * 2008-05-27 2008-12-05 이종순 3상4선식 전력량 오차 제거 장치
EP2648010A1 (fr) * 2012-04-04 2013-10-09 Socomec S.A. Procédé de gestion des alarmes en fonction des courants de défaut dans une installation électrique et dispositif de mise en oeuvre dudit procédé
CN204465011U (zh) * 2015-01-12 2015-07-08 上海豫源电力科技有限公司 配网电力损耗动态优化平衡装置
KR20170038454A (ko) * 2015-09-30 2017-04-07 한국전력공사 중성점 접지 고객용 3상3선식 2소자 계량 시스템

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352891A (en) * 1999-08-03 2001-02-07 Alstom Uk Ltd Fault protection in multi-phase power systems
WO2013038176A2 (fr) * 2011-09-12 2013-03-21 Metroic Limited Mesure du courant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5444377A (en) * 1992-12-28 1995-08-22 Merlin Gerin Electronic trip device comprising a test device
KR20050095534A (ko) * 2004-12-01 2005-09-29 (주)신우디엔시 영상전류 보상용 3상 전력 계량장치
KR200442726Y1 (ko) * 2008-05-27 2008-12-05 이종순 3상4선식 전력량 오차 제거 장치
EP2648010A1 (fr) * 2012-04-04 2013-10-09 Socomec S.A. Procédé de gestion des alarmes en fonction des courants de défaut dans une installation électrique et dispositif de mise en oeuvre dudit procédé
CN204465011U (zh) * 2015-01-12 2015-07-08 上海豫源电力科技有限公司 配网电力损耗动态优化平衡装置
KR20170038454A (ko) * 2015-09-30 2017-04-07 한국전력공사 중성점 접지 고객용 3상3선식 2소자 계량 시스템

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STEFANIE BALKENHOL: "POWER ANALYZER PCE-360 INSTRUCTION MANUAL CONTENTS", 24 September 2018 (2018-09-24), XP055663604, Retrieved from the Internet <URL:https://www.pce-instruments.com/english/slot/2/download/5852697/manual-power-analyzer-pce-360-en_1164188.pdf> *

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