EP1475813A1 - Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques - Google Patents

Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques Download PDF

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Publication number
EP1475813A1
EP1475813A1 EP03405322A EP03405322A EP1475813A1 EP 1475813 A1 EP1475813 A1 EP 1475813A1 EP 03405322 A EP03405322 A EP 03405322A EP 03405322 A EP03405322 A EP 03405322A EP 1475813 A1 EP1475813 A1 EP 1475813A1
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EP
European Patent Office
Prior art keywords
current
mess
contact
measurement signal
switch
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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
EP03405322A
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German (de)
English (en)
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EP1475813B1 (fr
Inventor
Wimmer Wolfgang
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ABB Technology AG
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ABB Technology AG
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Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to DE50312381T priority Critical patent/DE50312381D1/de
Priority to AT03405322T priority patent/ATE456853T1/de
Priority to ES03405322T priority patent/ES2338543T3/es
Priority to EP03405322A priority patent/EP1475813B1/fr
Priority to US10/837,576 priority patent/US7123461B2/en
Publication of EP1475813A1 publication Critical patent/EP1475813A1/fr
Application granted granted Critical
Publication of EP1475813B1 publication Critical patent/EP1475813B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • H01H2071/044—Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures

Definitions

  • the invention relates to the field of secondary technology for electrical switchgear, especially the Monitoring of switches in high, medium or low voltage switchgear. It is based on a procedure a computer program and a device for determination the contact erosion of circuit breakers in one electrical switchgear and a switchgear with such a device according to the preamble of the independent Claims.
  • DE 102 04 849 A1 discloses a method for determining contact wear in a tripping unit. A cumulative energy converted in the circuit breaker contacts is calculated, which is proportional to the contact wear. For this purpose, the contact current I is sampled, squared during the contact separation period, multiplied by a fixed time T between samples and summed up for each contact pair in relation to each type of error or as a total.
  • the time delay between the opening of the circuit breaker and the contact movement in the circuit breaker can be measured or estimated on the basis of typical mechanism times or those published by the manufacturer. If the adjustable threshold values for contact erosion are exceeded, a warning signal or alarm signal can be issued or the circuit breaker can be switched off or serviced.
  • the arc energy can also be determined from voltage times current or approximately from current I times time T. It is disadvantageous that current measurement errors in the case of overcurrents are not taken into account for the determination of arc energy and contact erosion. Another disadvantage is the relatively large measuring and computing effort.
  • EP 0 193 732 A1 discloses a monitoring and control device for switching devices and switching device combinations for determining the required maintenance times.
  • a plurality of sensors measure or calculate wear states of the switching devices and generate alarm or maintenance information according to urgency.
  • the contact erosion can directly, z. B. detected by displacement sensors, rotary angle sensors or light barriers or determined indirectly by linking the current level, switching voltage, phase angle, number of circuits, switching moments, current steepness or time constants.
  • the contact erosion is determined indirectly by evaluating the current and temperature of the respective current path. Disadvantages are high measurement requirements and complex signal processing. Measurement errors due to saturation of the current transformer also go unnoticed.
  • the object of the present invention is to provide a method, a computer program, a device and a switchgear assembly with such a device for improved and simplified monitoring of switches in electrical switchgear assemblies. According to the invention, this object is achieved by the features of the independent claims.
  • the invention consists in a method for determining contact wear in an electrical switch, in particular in electrical switchgear for high or medium voltage, a contact current flowing through the switch during a switching operation being detected with the aid of a current transformer and evaluated with regard to contact wear , in order to determine a state variable characterizing the contact wear, a current measurement signal of the current transformer is first measured as a function of time, the presence of a measurement error is detected when deviations occur between the expected contact current and the current measurement signal, and at least one characteristic current value is detected from the current measurement signal when the measurement error is detected is determined and used to determine the state variable.
  • the condition size must be selected so that it represents a reliable measure of the contact erosion.
  • the expected contact current is particularly characterized by the temporal course of the contact current, in particular by reaching a maximum current at the end of a quarter or three-quarter period of the mains frequency of the nominal current applied to the switch. Depending on the switching action and type of error, other expected contact currents are also conceivable.
  • Contact wear can also be determined with great reliability by the method if the fault current or arcing current relevant for contact erosion is not or cannot be measured correctly. The use of the characteristic current value instead of the complete current measurement signal simplifies and specifies the calculation of the contact wear. Overall, the contact wear can be calculated more accurately and the maintenance of circuit breakers and similar switching devices can be carried out instead of periodically without loss of operational safety, which means that Maintenance costs can be reduced accordingly.
  • a saturation of the current measurement signal is detected as a measurement error and a maximum current measurement signal of the current transformer is used as the characteristic current value if it occurs and in particular is detected before a quarter period of an alternating current applied to the switch.
  • the saturation of conventional current transformers often makes an exact measurement of the arc overcurrent impossible and thus falsifies the contact burn-up calculation, especially for the fault cases that cause the most contact burn-up. This can now be corrected by calculation.
  • the embodiment according to claim 3 has the advantage that high fault currents can be detected and the state size represents a reliable, well-predictable measure of contact erosion.
  • the embodiment according to claim 4 has the advantage that a very simple calculation rule for contact wear calculation is specified.
  • the embodiment according to claim 5 has the advantage that the reliability of the contact erosion calculation is improved by the exact determination of the arc start.
  • the embodiment according to claim 6 has the advantage that a selection of functions for calculating the contact erosion is specified and, if necessary, a special function can be selected for specific switches or fault current events.
  • the embodiment according to claim 7 has the advantage that manufacturer information can also be used for improved contact erosion calculation.
  • the embodiment according to claim 8 has the advantage that an additional, independent calculation of the contact wear can be carried out.
  • the embodiment according to claim 9 has the advantage that the contact erosion can be permanently monitored and / or subsequently determined from archived data. In particular, fault record data can be used, as z. B. in a fault recorder collection system, also called station monitoring system or SMS, are available.
  • the invention relates to a computer program for determining contact wear in an electrical switch, the method steps according to claims 1-9 being implemented by program code, furthermore an apparatus for carrying out the method and a switchgear assembly comprising the apparatus.
  • Circuit breakers are designed for a certain number of mechanical switching operations or switching cycles. Are z. B. in the event of a fault, larger currents are switched off, the resulting arc burns off the contacts more than calculated in normal switching operations. In order for the circuit breaker to remain functional, the contacts must be replaced before they have completely burned down. The degree of burn-up per switching operation depends on the energy of the arc that occurs. This energy is proportional to the integral ⁇ I 2 dt, where I denotes the current flowing during the arc duration and t the time.
  • switches 3 in electrical switchgear systems 1 are monitored for contact wear, in that a contact current I f flowing through the switch 3 during a switching operation is detected at least approximately by a current measurement signal I mess of a current transformer 30 or current sensor 30 as a function of time t, in the event of deviations
  • a measurement error ⁇ is detected between the expected contact current I f and the current measurement signal I mess and at least one characteristic current value I char is determined from the current measurement signal I mess and is used to determine a state variable characterizing contact wear. This estimate is often a bit too conservative, but always on the safe side.
  • the procedure can be part of a power system monitoring system. 1 shows an exemplary embodiment in which a largely sinusoidal fault current I f is present.
  • a current maximum I is run through at the time t max within a quarter period of the fault current signal I f or the mains frequency applied to the switch 3.
  • the occurrence of the current maximum I max is detected when the deviation or the measurement error ⁇ between the fault current profile I f (t) and the current measurement signal profile I mess (t) exceeds a tolerance value ⁇ min .
  • the contact current I f is typically an overcurrent or short-circuit current I f during a switch-off operation, the course of which is known very precisely beforehand.
  • a current maximum I max that occurs in the current measurement signal I mess before reaching a quarter period of the mains frequency is a reliable indication of a measurement error ⁇ .
  • the current maximum I max is now defined as a characteristic current value I char and used to calculate the contact erosion state variable.
  • the state variable should preferably be a measure of an arc power during the switching operation and in particular a contact current-time integral.
  • the current measurement signal I mess is detected from a first point in time t 0 at the start of the current half-wave in which the switching action occurs to a second point in time t max at which a maximum current measurement signal I max occurs, and from second time t max up to a third time t 0 at the end of the current half-wave approximated by the maximum current measurement signal I max .
  • the accuracy of the contact erosion calculation depends on how exactly the starting time of the arc can be determined.
  • the first time t 0 is to be defined as the start time of the arc of the contact current I f .
  • the calculation is most accurate if t o is known as a binary indication in the fault record; t o can also be determined with a time delay based on empirical values from an opening command, a protective trigger command or a contact movement of the switch 3. Any fluctuations in this time value are of minor importance compared to other influencing factors and irregularities in contact burn-off. Systematic errors caused by values of the starting time t 0 that are too large or too small can be corrected if, for. B. on the occasion of maintenance, the expected burnup is compared with the actual one and the time delay is corrected accordingly.
  • a time delay value that is too small should be used at the beginning of a contact erosion history rather than a value that is too large, so that the contact erosion is initially overestimated in the calculation.
  • a time integral ⁇ f (I mess ) dt is then formed via a function f (I mess ) of the current measurement signal I mess detected and approximated in sections .
  • the integral ⁇ I mess 2 dt or ⁇ I mess 1.6 dt is determined with the current measurement signal I mess approximated according to FIG. 1 for the approximate determination of the contact erosion.
  • a square root function f (I mess ) (I mess 2 ) 1/2 which defines an effective switch-off current I eff can also be used as function f (I mess ).
  • Other functions f (I mess ) are also possible.
  • the time integral ⁇ f (I mess ) dt via the function f (I mess ) can be approximated by a summation of function values at interpolation points. B. are given by sampling the current measurement signal I mess .
  • the state variable is selected equal to the time integral ⁇ f (I mess ) dt times a contact erosion constant c and the contact erosion constant c from manufacturer information, in particular from curves showing the number of permitted switching operations N (I eff ) as a function of an effective breaking current per switching operation I eff , and / or determined from empirical values for a switch type and switch location.
  • a sample value (cnt) of the current measurement signal is read in for each cnt value and the condition sample (cnt ) ⁇ I max checked. If the condition is met, an auxiliary variable CWI and sample (cnt) are set.
  • an effective switch-off current I eff can additionally be determined for each switching operation, contact wear as a percentage of the switching operations carried out relative to the total number of permitted switching operations from a curve over the number of permitted switching operations N (I eff ) in function of the effective switch-off current I eff this effective breaking current I eff are determined and the percentages for all relevant switching operations carried out are added up to form a cumulative contact wear.
  • the accumulated percentage value represents a control variable for the contact wear state variable Cwsum determined according to the invention.
  • FIG. 4 shows a schematic representation of a data acquisition system for the inventive determination of the contact wear state variable Cwsum and / or the accumulated percentage value from N (I eff ).
  • Switchgear 1 has switches 3, typically circuit breakers 3, which are equipped with current transformers 30 or current sensors 30, typically conventional current transformers 30 with a saturable core. For example, instrument transformers with 1% accuracy and accounting converters with 0.1% - 0.5% accuracy are saturated at the high currents that cause the most contact wear.
  • the current transformers 30 are connected to means 4 for data acquisition at electrical switches 3, in particular with fault recorders 4, protective devices 4 or control devices 4. These data acquisition means 4 are connected via serial communication 5 or via data carriers 5 to a central acquisition unit 6 for calculating contact wear and preferably to a database 7 for data on contact wear. With the help of this device 2 for contact erosion calculation, the method described above can be implemented. In particular, the contact wear can be monitored online, ie continuously during operation, or evaluated retrospectively from archived data, in particular with a function f (I mess ) of the current measurement signal I mess adapted to a switch type or switch location .
  • the contact wear can be determined from recordings of switch-off currents I mess from fault recorders 4 or protection and control devices 4 with fault record function, all records of the switch-off currents I mess of a switchgear assembly 1 being collected centrally, in particular in an existing or specially designed fault recorder collection system 4 -6, also called SMS or station monitoring system.
  • the invention also extends to such a device 2 for contact erosion calculation, which is integrated, for example, in the system control system (not shown) of the switchgear 1, and to an electrical switchgear 1 which comprises such a device 2. Overall, there is an improved condition-controlled instead of periodic maintenance of switches 3 and their switch contacts.

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  • Keying Circuit Devices (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
EP03405322A 2003-05-07 2003-05-07 Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques Expired - Lifetime EP1475813B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE50312381T DE50312381D1 (de) 2003-05-07 2003-05-07 Verfahren und Vorrichtung zur Ueberwachung von Schaltgeräten in elektrischen Schaltanlagen
AT03405322T ATE456853T1 (de) 2003-05-07 2003-05-07 Verfahren und vorrichtung zur ueberwachung von schaltgeräten in elektrischen schaltanlagen
ES03405322T ES2338543T3 (es) 2003-05-07 2003-05-07 Procedimiento y dispositivo de supervision de conmutadores en instalaciones de conmutacion electrica.
EP03405322A EP1475813B1 (fr) 2003-05-07 2003-05-07 Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques
US10/837,576 US7123461B2 (en) 2003-05-07 2004-05-04 Method and device for monitoring switchgear in electrical switchgear assemblies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03405322A EP1475813B1 (fr) 2003-05-07 2003-05-07 Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques

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Publication Number Publication Date
EP1475813A1 true EP1475813A1 (fr) 2004-11-10
EP1475813B1 EP1475813B1 (fr) 2010-01-27

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EP03405322A Expired - Lifetime EP1475813B1 (fr) 2003-05-07 2003-05-07 Procédé et dispositif de contrôle d'appareils de commutation dans des installations de commutation électriques

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US (1) US7123461B2 (fr)
EP (1) EP1475813B1 (fr)
AT (1) ATE456853T1 (fr)
DE (1) DE50312381D1 (fr)
ES (1) ES2338543T3 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005104155A1 (fr) * 2004-04-21 2005-11-03 Siemens Aktiengesellschaft Procede pour determiner une valeur de jeu de commutation residuel qui indique l'usure de contacts de commutation d'un commutateur electrique
DE102004062266A1 (de) * 2004-12-23 2006-07-13 Siemens Ag Verfahren und Vorrichtung zum sicheren Betrieb eines Schaltgerätes
EP2299459A1 (fr) * 2009-09-15 2011-03-23 General Electric Company Dispositif et procédé pour contrôler l'état de contact électrique
EP2328159A1 (fr) 2009-11-25 2011-06-01 ABB Research Ltd. Procédé et dispositif de détermination d'une usure d'un élément de contact
EP2372741A1 (fr) * 2005-11-28 2011-10-05 S & C Electric Company Procédé pour définir la fin de vie dýun interrupteur sous vide
WO2012072810A1 (fr) 2010-12-02 2012-06-07 Abb Research Ltd Procédé et dispositif de contrôle d'appareils de connexion
DE102011080826A1 (de) * 2011-08-11 2013-02-14 Siemens Aktiengesellschaft Verfahren zum Ermitteln der Lichtbogenleistung eines Schalters, Verfahren zum Auslösen eines Schalters anhand der Lichtbogenleistung und Verfahren zur Ermittlung der Belastung der Kontakte eines Schalters anhand der Lichtbogenenergie
WO2015043941A1 (fr) * 2013-09-25 2015-04-02 Robert Bosch Gmbh Procédé et dispositif de détermination du vieillissement d'un élément d'interruption électronique, en particulier un dispositif de protection de puissance
EP3336560A1 (fr) * 2016-12-16 2018-06-20 Schneider Electric Industries SAS Procédé et dispositif de diagnostic d'usure d'un appareil électrique de coupure, et appareil électrique comportant un tel dispositif
EP3575808A1 (fr) * 2018-06-01 2019-12-04 Schneider Electric Industries SAS Procede et dispositif de diagnostic d'usure d'un appareil electrique de coupure, et appareil electrique comportant un tel dispositif
FR3112651A1 (fr) * 2020-07-20 2022-01-21 Schneider Electric Industries Sas Procédés pour estimer une propriété d’un appareil de commutation électrique, dispositifs pour mettre en œuvre ces procédés

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US7596459B2 (en) * 2001-02-28 2009-09-29 Quadlogic Controls Corporation Apparatus and methods for multi-channel electric metering
EP1793235A1 (fr) * 2005-11-30 2007-06-06 ABB Technology AG Système de surveillance pour des commutateurs à haute tension
US8560255B2 (en) * 2008-12-12 2013-10-15 Schneider Electric USA, Inc. Power metering and merging unit capabilities in a single IED
FR2945661A1 (fr) * 2009-05-18 2010-11-19 Schneider Electric Ind Sas Evaluation de l'usure de contacts enfonces par la variation de la rotation de l'arbre des poles
US20110133743A1 (en) * 2010-04-30 2011-06-09 Werner Barton Fault detection device and method for detecting an electrical fault
ES2878274T3 (es) * 2018-08-03 2021-11-18 Rittal Gmbh & Co Kg Dispositivo y procedimiento para la comprobación de un contenido de armario de distribución después de un montaje basado en la planificación
CN111505496B (zh) * 2020-05-08 2021-02-02 西安交通大学 一种基于电弧能量的真空断路器电寿命评估方法
CN113552436A (zh) * 2021-07-27 2021-10-26 中船九江精达科技股份有限公司 一种中小型精密机械系统装配质量检测方法
CN114076868B (zh) * 2021-11-18 2022-08-02 广东电网有限责任公司广州供电局 一种开关缺陷识别方法、装置、设备和可读存储介质

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DE19928192A1 (de) 1999-06-19 2000-12-21 Abb Patent Gmbh Verfahren zur Rekonstruktion eines Stromes
DE10204849A1 (de) * 2001-02-07 2002-08-22 Gen Electric Verfahren zur Bestimmung der Kontaktabnutzung in einer Auslöseeinheit

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005104155A1 (fr) * 2004-04-21 2005-11-03 Siemens Aktiengesellschaft Procede pour determiner une valeur de jeu de commutation residuel qui indique l'usure de contacts de commutation d'un commutateur electrique
DE102004062266A1 (de) * 2004-12-23 2006-07-13 Siemens Ag Verfahren und Vorrichtung zum sicheren Betrieb eines Schaltgerätes
EP2372741A1 (fr) * 2005-11-28 2011-10-05 S & C Electric Company Procédé pour définir la fin de vie dýun interrupteur sous vide
CN102820186B (zh) * 2005-11-28 2016-12-07 施恩禧电气有限公司 确定以及适应性地预测真空中断器的寿命终止的方法
EP2299459A1 (fr) * 2009-09-15 2011-03-23 General Electric Company Dispositif et procédé pour contrôler l'état de contact électrique
EP2328159A1 (fr) 2009-11-25 2011-06-01 ABB Research Ltd. Procédé et dispositif de détermination d'une usure d'un élément de contact
WO2011064064A1 (fr) 2009-11-25 2011-06-03 Abb Research Ltd Procédé et dispositif de détermination de l'usure d'un élément de contact
CN102714101A (zh) * 2009-11-25 2012-10-03 Abb研究有限公司 用于确定接触元件的耗损的方法和装置
US9406451B2 (en) 2009-11-25 2016-08-02 Abb Research Ltd Method and apparatus for determining the wear on a contact element
CN102714101B (zh) * 2009-11-25 2015-04-08 Abb研究有限公司 用于确定接触元件的耗损的方法和装置
RU2551645C2 (ru) * 2009-11-25 2015-05-27 Абб Рисерч Лтд Способ и устройство для определения износа контактных элементов
WO2012072810A1 (fr) 2010-12-02 2012-06-07 Abb Research Ltd Procédé et dispositif de contrôle d'appareils de connexion
DE102011080826B4 (de) * 2011-08-11 2016-01-21 Siemens Aktiengesellschaft Verfahren zum Ermitteln der Lichtbogenleistung eines Schalters, Verfahren zum Auslösen eines Schalters anhand der Lichtbogenleistung und Verfahren zur Ermittlung der Belastung der Kontakte eines Schalters anhand der Lichtbogenenergie
DE102011080826A1 (de) * 2011-08-11 2013-02-14 Siemens Aktiengesellschaft Verfahren zum Ermitteln der Lichtbogenleistung eines Schalters, Verfahren zum Auslösen eines Schalters anhand der Lichtbogenleistung und Verfahren zur Ermittlung der Belastung der Kontakte eines Schalters anhand der Lichtbogenenergie
WO2015043941A1 (fr) * 2013-09-25 2015-04-02 Robert Bosch Gmbh Procédé et dispositif de détermination du vieillissement d'un élément d'interruption électronique, en particulier un dispositif de protection de puissance
US10101394B2 (en) 2013-09-25 2018-10-16 Robert Bosch Gmbh Method and apparatus for determining the aging of an electronic interrupter element, in particular of a power contactor
CN105580055A (zh) * 2013-09-25 2016-05-11 罗伯特·博世有限公司 用于确定电子中断元件尤其是功率接触器的老化的方法和装置
US11404223B2 (en) 2016-12-16 2022-08-02 Schneider Electric Industries Sas Method and device for diagnosing wear of an electrical switching unit, and electrical unit comprising such a device
EP3336560A1 (fr) * 2016-12-16 2018-06-20 Schneider Electric Industries SAS Procédé et dispositif de diagnostic d'usure d'un appareil électrique de coupure, et appareil électrique comportant un tel dispositif
FR3060758A1 (fr) * 2016-12-16 2018-06-22 Schneider Electric Industries Sas Procede et dispositif de diagnostic d'usure d'un appareil electrique de coupure, et appareil electrique comportant un tel dispositif
EP3575808A1 (fr) * 2018-06-01 2019-12-04 Schneider Electric Industries SAS Procede et dispositif de diagnostic d'usure d'un appareil electrique de coupure, et appareil electrique comportant un tel dispositif
JP2020012813A (ja) * 2018-06-01 2020-01-23 シュネーデル、エレクトリック、インダストリーズ、エスアーエスＳｃｈｎｅｉｄｅｒ Ｅｌｅｃｔｒｉｃ Ｉｎｄｕｓｔｒｉｅｓ Ｓａｓ 電気スイッチング・ユニットの摩耗を診断するための方法およびデバイス、ならびにそのようなデバイスを備える電気ユニット
US11079435B2 (en) 2018-06-01 2021-08-03 Schneider Electric Industries Sas Method and device for diagnosing wear of an electrical switching unit, and electrical unit comprising such a device
FR3082005A1 (fr) * 2018-06-01 2019-12-06 Schneider Electric Industries Sas Procede et dispositif de diagnostic d'usure d'un appareil electrique de coupure, et appareil electrique comportant un tel dispositif
FR3112651A1 (fr) * 2020-07-20 2022-01-21 Schneider Electric Industries Sas Procédés pour estimer une propriété d’un appareil de commutation électrique, dispositifs pour mettre en œuvre ces procédés
EP3944274A1 (fr) * 2020-07-20 2022-01-26 Schneider Electric Industries SAS Procédés pour estimer une propriété d'un appareil de commutation électrique, dispositifs pour mettre en oeuvre ces procédés
US11728101B2 (en) 2020-07-20 2023-08-15 Schneider Electric Industries Sas Methods for estimating a property of an electrical switching device, devices for implementing these methods

Also Published As

Publication number Publication date
US7123461B2 (en) 2006-10-17
DE50312381D1 (de) 2010-03-18
EP1475813B1 (fr) 2010-01-27
ATE456853T1 (de) 2010-02-15
ES2338543T3 (es) 2010-05-10
US20040223276A1 (en) 2004-11-11

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