WO2012016939A1 - Système de mesure - Google Patents

Système de mesure Download PDF

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Publication number
WO2012016939A1
WO2012016939A1 PCT/EP2011/063186 EP2011063186W WO2012016939A1 WO 2012016939 A1 WO2012016939 A1 WO 2012016939A1 EP 2011063186 W EP2011063186 W EP 2011063186W WO 2012016939 A1 WO2012016939 A1 WO 2012016939A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
measuring
test signal
measuring system
processing unit
Prior art date
Application number
PCT/EP2011/063186
Other languages
German (de)
English (en)
Inventor
Andreas Fischer
Michael Gerstner
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2012016939A1 publication Critical patent/WO2012016939A1/fr

Links

Classifications

    • 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
    • H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
    • H02H7/222—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 distribution gear, e.g. bus-bar systems; for switching devices for switches
    • 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
    • H02H7/008—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 protective arrangements according to this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2217/00—Temperature measurement using electric or magnetic components already present in the system to be measured
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature

Definitions

  • the present invention relates to a measuring system for measuring a current flowing through a conductor of a power switch ⁇ .
  • This is in particular a power circuit in the field of industrial automation technology.
  • a circuit breaker has with its pole paths / conductors on a primary circuit.
  • a measuring system such as a current transformer or actuator
  • the current transformer and / or actuator is for this purpose coupled to a pole path of the circuit breaker, for example via a coil.
  • the pole path and also the current transformer and / or actuator coupled to it can become very hot. This heating or even mechanical influences such as vibrations can ultimately lead to damage to the current transformer or actuator.
  • a temperature monitoring of the electronics of the circuit breaker can be done by a microcontroller and its built-in reference diode. In this temperature monitoring, the temperature of the microcontroller is considered.
  • an apparatus that is, by a measurement system for measuring a current flowing through a conductor current of a circuit breaker with a downstream surrounding the conductor coil, the coil switched measuring resistor, a coil upstream of the signal generator, via which a test signal flowing through the coil can be fed, a measuring means for measuring ei ⁇ ner voltage applied to the measuring resistor, and a processing unit, which based on the test signal caused by the measuring resistor voltage, a thermal state of the coil can determine, and a procedural ren according to claim 9, ie by a method for determining a thermal state of a coil of a measuring system, wherein the measuring system for measuring a current flowing through a conductor, preferably a circuit breaker, ei ne surrounding the conductor coil, one of Coil nachgeschalte th measuring resistor, a signal upstream of the coil over which a signal flowing through the coil test signal is fed, a measuring means for measuring a voltage applied to the measuring resist
  • the current of a conductor of the primary side of a circuit breaker is preferably measured age.
  • This conductor is surrounded by the coil of the measuring system. Consequently, a current flowing through the conductor can be determined via the coil.
  • the coil is in this case according to the invention a measuring resistor connected downstream and a signal generator upstream.
  • the signal generator is also investigated det to feed a test signal, so that this on the spu le and ultimately the measuring resistor flows.
  • a measuring means comprises a measuring resistance applied to the measurement reflection ⁇ stood voltage can be measured. Consequently, the measuring means can determine a measuring resistor voltage caused by the test signal at the measuring resistor.
  • a processing unit wel ⁇ che can access the determined measured withstand voltages, on the basis of the evoked by the test signal measuring resistor voltage can determine the thermal state of the coil.
  • a caused by the test signal Messwi ⁇ derstandsschreib is first measured by the measuring means. Based on the existing measuring resistor voltage, a conclusion can now be drawn on the internal resistance of the coil. At ⁇ hand of this internal resistance of the coil can last ⁇ finally a conclusion on the temperature of the coil SUC ⁇ gen.
  • reference values which reflect the thermal behavior of the coil stored in the processing unit. It is preferably characterizing value (for example, voltage of the measuring resistance or internal resistance of the coil) ter stands as a reference value in the processing unit out ⁇ at least one the thermal behavior of the coil.
  • an analysis of the measured reflection capable voltage or the internal resistance of the coil over time a return circuit to the thermi ⁇ specific behavior of the coil.
  • the resistance (internal resistance ⁇ standing) this coil per 100K to about 40% change. It can thus be obtained at ⁇ on the present temperature and the present thermal state of the coil hand of the determined internal resistance of the coil, a return ⁇ circuit.
  • the processing unit can thus be determined by the measuring resistor to determine the internal resistance of the coil and finally a conclusion on the thermal state of the coil gewin ⁇ NEN.
  • the thermal state of the coil can thus be be determined directly on the basis of the present measuring resistor voltage or via the internal resistance of the coil.
  • the thermal state, in particular the temperature, the SPU ⁇ le can therefore be monitored so that security measures for exceeding a limit value of the thermal state of the coil are introduced, so that damage of the coil can be avoided, and damage is detected ,
  • the tempera ture ⁇ the coil based on a comparison of the measured resistance detected voltage is directly determined with corresponding stored reference values in the processing unit, the tempera ture ⁇ the coil.
  • the processing unit preferably comprises the measuring means.
  • the advantage achieved with the invention is that the measuring system specifically determines the thermal state of the coil. There is thus an immediate monitoring of the warmest and therefore most critical point within the Messsys ⁇ system . For this purpose, no separate temperature sensor, which is attached to the coil, for example, is necessary. On intelligent ⁇ te, a conclusion can using the inventive measuring system on the thermal state of the coil and recovered last ⁇ finally the measurement system. For example, if an exceeding of a limit value of the thermal state of the bobbin determined by the measurement system, and in particular by the processing unit, socatenah ⁇ measures may be initiated, making it of no damage Coil and ultimately the measuring system comes.
  • the processing unit in the processing unit at least one reference value after ⁇ is inserted, so that it can be determined on the basis of a comparison of the determined Messwi ⁇ derstandschreib or standing voltage from the determined measurement thermistors derived value with the reference value of the thermal state of the coil ,
  • the comparison is in this case preferably carried out by the proces ⁇ processing unit.
  • This reference value or the Refe rence ⁇ values are preferably stored in a nonvolatile memory.
  • one or more reference values are stored, so that can be done to draw a conclusion on the thermal Verhal ⁇ ten (preferably to the temperature) of the coil based on the comparison of the determined measurement resistor voltage or derived from the determined measurement resistor voltage value with the reference value / the reference values ,
  • the derived from the determined measurement resistor voltage value can be, for example, the internal resistance of the SPU ⁇ le.
  • a reference value is therefore in particular a voltage of the measuring resistor, a coil internal resistance or a value characterizing the measuring resistor voltage or the coil internal resistance.
  • the reference value can, for example, reflect the internal resistance of the coil or the measuring resistance voltage for the maximum permissible thermal state of the coil. If this reference value were exceeded, consequently a critical thermal state of the measuring system would be present, then that it can come to a damage of the coil. Preferably Si ⁇ cherheitshit be initiated shortly before a timeout or when exceeding a maximum permissible reference value.
  • the processing unit provided that the thermal state of the coil below a preferably adjustable threshold value over ⁇ , a warning signal.
  • the thermal state is preferably determined based on the réellewi ⁇ DERS tandes the coil or directly from the Messwiderstands- voltage.
  • the warning signal may in this case be beispielswei ⁇ se an electrical, optical or acoustic signal. It is also conceivable that this emergency signal directly an emergency shutdown of the circuit breaker is brought about.
  • the determination of the thermal state of the coil takes place during an inactive state of the conductor.
  • the coil is a measuring coil of a current transformer and / or egg ⁇ nes actuator of the circuit breaker.
  • the current transformer and / or actuator is part of the secondary circuit of the circuit breaker.
  • the current transformer and the actuator having such a measurement system, so that independently a thermal monitoring of the measuring coil of the current transformer and / or actuator can be done. In this way, mechanical damage to the measuring coil can be avoided by thermal overheating.
  • the current transformer is preferably used for the exact determination of the current flowing through the conductor, whereas the actuator preferably serves a mechanical triggering when a current flowing over the conductor is exceeded.
  • test signal is fed to a ver ⁇ ensured by the coil with energy Nutzsignaltechnisch a secondary side of the circuit breaker.
  • the payload line is directly connected to the coil and is powered by the coil with energy. Over the useful signal line may ultimately ⁇ Current measurement of the line at the (primary side of the circuit breaker) adjoining carried current.
  • the measuring system further comprises a filter with which the test signal can be filtered out of the useful signal line.
  • test signal can be used to determine the mixing state of the coil, without forcing on the Nutzsignaltechnisch performed current measurement vertig.
  • the test signal is a voltage level.
  • Bypulspe gel ⁇ a change in the measurement thermistors can be caused stood voltage at the measuring resistor.
  • a circuit breaker comprises such a measuring system.
  • the coil of the measuring system of the circuit breaker eg current transformer / actuator
  • the thermal state of the coil can be determined and ultimately monitored, so that countermeasures can be taken in good time.
  • a circuit breaker comprises a current transformer and an actuator
  • the coil of the current transformer and the coil of the actuator are preferably monitored independently of each other in terms of their thermal state.
  • the current transformer and the actuator thus each comprise a measuring system according to the invention. In this case, the monitoring of the thermal state of the respective measuring system can take place in parallel but also alternately (ie not simultaneously).
  • the feeding of the test signal is inactivated during a ⁇ ven state of the conductor.
  • the monitoring of the circuit breaker au ⁇ ßercher can flown its active operation.
  • the power scarf ⁇ ter and, in particular, the measurement system can be controlled in this way towards ⁇ clearly proper operation. If, for example, there is a line break within the coil, this is detected early.
  • FIG 1 shows a schematic illustration of a measuring system
  • FIG 2 is a schematic illustration of a measurement system of Fi gur ⁇ 1, which is coupled to a line of a primary circuit
  • 1 shows a schematic illustration of a measuring system.
  • This measurement system is part of a secondary circuit ei ⁇ nes circuit breaker. Use of the measuring system, a current of a conductor of the circuit breaker are measured.
  • the measuring system for measuring the current of the conductor of the circuit breaker is hereby partly shown.
  • the illustrated ⁇ finished measuring system comprises a coil 1 which supplies a useful signal ⁇ line 7 with energy.
  • This useful signal line 7 is used to determine the current to be measured on the line of the primary side.
  • the conductor of the primary side is wrapped by the coil 1, so that, depending on the current of the line, the coil 1 supplies the useful signal line with energy.
  • This coil 1 is connected upstream of a signal generator 2 and a Messwi ⁇ resistance 3 downstream.
  • the signal transmitter 2 can inject a test signal to the Nutzsignal für ⁇ 7, so that the test signal flows through the coil 1 and, ultimately, via the sensing resistor.
  • a measuring means 4 can measure to the Messwi ⁇ resistor 3 applied voltage.
  • a processing unit 5 which comprises the measuring means 4 can consequently determine the voltage of the measuring resistor 3 (measuring resistance voltage) via the measuring means 4
  • the processing unit 5 sets a plurality of reference values ⁇ behind which the thermal behavior of the coil against spat ⁇ rules.
  • reference values for example voltage values of the measuring resistor 3 or the internal resistances can ⁇ NEN the coil. 1
  • the reference values are stored in a nonvolatile memory of the processing unit 5.
  • the Swisssein ⁇ unit 5 can thus be based on a determination of the induced by the test signal measuring resistor voltage standing at the measurement thermistors 3 and a comparison of these determined measured resistance voltage with the reference values, ultimately a return circuit to the thermal state of the coil 1 and insbeson ⁇ particular to the present temperature to win the coil 1. In the process, a conclusion on the internal resistance of the coil 1 is ultimately formed on the basis of the determined measuring resistor voltage of the measuring resistor 3.
  • the internal resistance of the coil 1 is highly temperature-dependent. For example, considering a coil 1 made of copper, then the changes in ⁇ nenwiderstand per 100K to about 40%. Depending on the ahead ⁇ internal resistance of the coil 1, a feedback circuit ⁇ thus can be obtained in the present temperature and the vorlie ⁇ constricting thermal state of the coil. 1 With the aid of the reference values, the ratio of the thermal state of the coil 1 with respect to the measuring resistor voltage caused by the test signal is stored in the processing unit 5. By means of a by the test signal meritge ⁇ called measuring resistor voltage or a detected internal resistance of the coil 1 can therefore draw a conclusion on the present thermal state may preferably be obtained in the present temperature of the coil. 1
  • the measuring system further comprises a mass 6, so that via the signal generator 2 preferably a voltage level can be generated.
  • a mass 6 so that via the signal generator 2 preferably a voltage level can be generated.
  • To prevent distortion of a distortion of the current flowing through the Nutzsignal Ober 7 stream further comprises the Nutzsig ⁇ naltechnisch 7, a filter 8, wherein the test signal from the Nutzsignal Ober 7 filters out such that it is indeed passed through the coil 1 to the measurement resistor 3, but the via the useful signal line 7 to be measured current strength of the circuit breaker not falsified.
  • the processing unit 5 is formed by a microcontoller.
  • the coil 1 is in this example a coil 1 of a current transformer.
  • the coil 1 may be a coil 1 of an actuator (Mag Latch).
  • Mag Latch Magnetic Latch
  • the internal resistance of the coil 1 of the current ⁇ converter or actuator is monitored based on temperature calculations. Due to the feeding of the test signal and its evaluation via the processing unit 5, the internal Resistance of the coil 1 or directly the temperature of the coil 1 can be determined. Because the internal resistance of the coil 1 or the measurement resistance voltage caused by the test signal changes as a function of the present temperature of the coil 1, a thermal state of the coil 1 can ultimately be detected.
  • a maximum permissible temperature or a maximum permissible thermal state of the coil 1 can be defined so that a warning signal is output when this limit value is exceeded.
  • a warning signal may for instance be formed by optical and / or acoustically ⁇ schematic signal transmitter.
  • an emergency shutdown of the circuit breaker can be made when the limit value is reached.
  • test signal Since the test signal is superimposed on the useful signal, it is filtered out again via the filter 8 from the useful signal.
  • a circuit breaker which comprises, for example, a voltage converter and an actuator, can therefore have both a measuring system for the voltage converter and a measuring system for the actuator. Consequently, the coils 1 the voltage converter and the actuator are each protected by the inventive method from thermal damage.
  • FIG. 2 shows a schematic illustration of a measuring system from FIG. 1, which is coupled to a line 9 of a primary circuit.
  • the measuring system of FIG 1 is coupled to a line 9 of a primary circuit.
  • the line 9 of the primary circuit is formed by a phase of a power switch ⁇ .
  • the current of this line 9 (phase) is determined by the measuring system.
  • a coil 1 is coupled to the line 9 of the primary current side such that, depending on the current flow on the line 9, a current flow takes place on the useful signal line 7.
  • the coil 1 is heated.
  • the measuring system according to the invention can ultimately be used to determine the thermal state of the coil 1 and thus prevent thermal damage to the measuring system and thus to the circuit breaker.

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention concerne un système de mesure destiné à mesurer un courant d'un disjoncteur, circulant à travers un conducteur (9). L'invention vise à empêcher la détérioration du système de mesure provoquée en particulier par une surcharge thermique et/ou par des effets mécaniques. A cet effet, le système de mesure comprend : - une bobine (1) entourant le conducteur (9), - une résistance de mesure (3) connectée en aval de la bobine (1), - un émetteur de signaux (2) connecté en amont de la bobine (1) et permettant d'injecter un signal d'essai passant par la bobine (1), - un moyen de mesure (4) destiné à mesurer une tension de résistance de mesure appliquée à la résistance de mesure (3), et - une unité de traitement (5) pouvant déterminer un état thermique de la bobine (1) au moyen de la tension de résistance de mesure provoquée par le signal d'essai.
PCT/EP2011/063186 2010-08-04 2011-08-01 Système de mesure WO2012016939A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010038894.7 2010-08-04
DE102010038894.7A DE102010038894B4 (de) 2010-08-04 2010-08-04 Messsystem, Leistungsschalter und Verfahren

Publications (1)

Publication Number Publication Date
WO2012016939A1 true WO2012016939A1 (fr) 2012-02-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/063186 WO2012016939A1 (fr) 2010-08-04 2011-08-01 Système de mesure

Country Status (2)

Country Link
DE (1) DE102010038894B4 (fr)
WO (1) WO2012016939A1 (fr)

Cited By (1)

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CN107290070A (zh) * 2017-08-04 2017-10-24 河北为信电子科技股份有限公司 一种智能节能式高效无线测温方法及其装置

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US9146294B2 (en) * 2012-07-19 2015-09-29 Hamilton Sundstrand Corporation Built-in test injection for current sensing circuit
DE102013018294B4 (de) * 2013-11-01 2020-01-09 Ean Elektroschaltanlagen Gmbh Einrichtung und Verfahren zur Erfassung der elektrischen Energie von ein- oder mehrphasigen elektrischen Verbrauchern
CN106525262A (zh) * 2016-10-13 2017-03-22 安徽万瑞冷电科技有限公司 一种二极管温度变送器及其变送方法
CN111200304B (zh) * 2018-11-20 2022-04-08 北京小米移动软件有限公司 无线充电线圈的温度检测电路、方法、装置及存储介质
DE102019119731A1 (de) * 2019-07-22 2021-01-28 Miele & Cie. Kg Induktionskochgeschirr für ein Induktionskochsystem mit einem Temperatursensor, Induktionskochsystem und Verfahren zum Betrieb des Induktionskochsystems

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US4922363A (en) * 1985-10-17 1990-05-01 General Electric Company Contactor control system
DE19803684A1 (de) * 1998-01-30 1999-08-05 Siemens Ag Zeitverzögerte Differenzstromschutzeinrichtung
DE10149982A1 (de) * 2001-10-10 2003-04-30 Siemens Ag Verfahren zur Ermittlung der Temperatur einer elektrischen Spule sowie zugehörige Vorrichtung
DE10341924A1 (de) * 2003-09-11 2005-04-07 Conti Temic Microelectronic Gmbh Relais mit einer Übertemperaturerkennung

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DE4122332A1 (de) * 1991-04-22 1992-10-29 Asea Brown Boveri Stromwandler fuer eine mittel- oder hochspannungsanlage
US8243409B2 (en) * 2007-02-07 2012-08-14 Siemens Aktiengesellschaft Protective device and method for its operation

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US4922363A (en) * 1985-10-17 1990-05-01 General Electric Company Contactor control system
DE19803684A1 (de) * 1998-01-30 1999-08-05 Siemens Ag Zeitverzögerte Differenzstromschutzeinrichtung
DE10149982A1 (de) * 2001-10-10 2003-04-30 Siemens Ag Verfahren zur Ermittlung der Temperatur einer elektrischen Spule sowie zugehörige Vorrichtung
DE10341924A1 (de) * 2003-09-11 2005-04-07 Conti Temic Microelectronic Gmbh Relais mit einer Übertemperaturerkennung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107290070A (zh) * 2017-08-04 2017-10-24 河北为信电子科技股份有限公司 一种智能节能式高效无线测温方法及其装置

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Publication number Publication date
DE102010038894A1 (de) 2012-02-09
DE102010038894B4 (de) 2014-12-24

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