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WO2002023207A1 - Procede et appareil de controle de l'etat d'un dispositif de commutation electrique - Google Patents

Procede et appareil de controle de l'etat d'un dispositif de commutation electrique Download PDF

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Publication number
WO2002023207A1
WO2002023207A1 PCT/SE2001/001932 SE0101932W WO0223207A1 WO 2002023207 A1 WO2002023207 A1 WO 2002023207A1 SE 0101932 W SE0101932 W SE 0101932W WO 0223207 A1 WO0223207 A1 WO 0223207A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching device
electric
electric switching
contacts
condition
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/SE2001/001932
Other languages
English (en)
Inventor
Magnus Backman
Lars Jonsson
Per Larsson
Lennart BALGÅRD
Jan-Anders Nolemo
Stefan Halén
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.)
ABB Technology AG
Original Assignee
ABB T&D Technology AG
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 ABB T&D Technology AG filed Critical ABB T&D Technology AG
Priority to AU2001282841A priority Critical patent/AU2001282841A1/en
Publication of WO2002023207A1 publication Critical patent/WO2002023207A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
    • H01H2003/266—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor having control circuits for motor operating switches, e.g. controlling the opening or closing speed of the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices

Definitions

  • the present invention relates to a method for checking a condi- tion of an electric switching device arranged in a current path of an electric plant, said switching device being controllable between locations for closing and breaking the current path, as well as an apparatus for carrying out such a condition check.
  • Electric plant is here to be given a very broad sense and principally comprises all types of electric circuits, such as transmission and distribution systems for electric power, electric plants within the industry and the like.
  • the invention is directed to all types of electric switching devices, which however have in common that they normally stays in a waiting position and carry out the task they are assigned to only at long time intervals.
  • Such electric switching devices may for example be of the type arranged in a current path for break- ing thereof upon occurrence of fault currents, such as for example in a switch gear for electricity supply within the industry or in distribution or transmission networks.
  • Electric switching device comprises also so-called transfer switches through which a current in a current path may be broken upon occurrence of a fault current in the current path for switching in another current path to a load or the like instead.
  • This electric switching device may also be of the type that in normal operation of the electric plant is open, i.e. keeps the current path therethrough broken, and only closes when anything particular happens.
  • the object of the present invention is to provide a method and a device for cheeking the state of an electric switching device of the type defined in the introduction, which enable a state checking of such electric switching devices being at least in some regard improved.
  • This object is according to the invention obtained by carrying out the checking in such a method during operation of the electric plant by carrying out the measurement of at least one parameter associated with the condition of the electric switching device without influencing the operation of the electric switching device.
  • That the electric switching device does not influence the operation means here that the electric switching device is switched in the current path as before in its waiting position and is able to carry out the task thereof. Carrying out for example any by- passing of the electric switching device or in another way remove the electric switching device from the current path for making the condition check is to be considered as if the operation of the electric plant is influenced. Thus, the operation of the electric plant is to be considered to be uninfluenced if the elec- trie switching device is still switched in so that it may carry out its task.
  • a number of advantages of carrying out the condition check through such a parameter measurement without influencing the operation through the electric switching device are obtained.
  • An important advantage is that the operation of the electric plant is not disturbed in any way.
  • Another advantage is that time consuming switchings or even movements of the electric switching device are avoided, so that a checking gets considerably simpler to carry out.
  • the measurement is carried without any need of having any maintenance staff to get to the electric switching device, so that the condition checks get considerably less expensive than before and may in principle be carried out as often as desired.
  • At least one parameter describing the state of any part of the electric switching device is calculated on the basis of the result of said measurement. It is advantageous to calculate such a parameter so as to directly get a value of the condition of said part of the electric switching device, even if measured parameters already mentioned may give an indication thereof.
  • condition check is carried out for an electric switching device comprising an electric actuating member such as an electric motor, arranged to control two contacts movable with respect to each other between said two positions. It is advantageous to carry out the condition check according to the invention of such an electric switching device, since it is very important that it is known that when a determined relative movement of the two contacts is ordered this also will be carried out by the electric actuating member. It is then a need of checking different pa- rameters associated with the function of the electric actuating member, such as the friction between contacts, the energy supply of the actuating member and so on.
  • the condi- tion check of the electric switching device is carried out by checking the function of the electric actuating member by or- dering a determined relative movement of the two contacts and measuring the result of this order and comparing it with an expected result. It may in this way be ensured that the electric switching device really functions as it shall. It is then possible to discover different defects thereof.
  • the distance for the relative movement may for example be measured through a position detector and a comparison of this distance with an expected distance may be carried out. Would there be a deviation this may for example depend upon a too high friction between the two contacts or a non-satisfying functioning of the energy supply to the electric actuating member.
  • the electric actuating member is according to a preferred em- bodiment of the invention adapted to receive energy stored in a capacitor, and the voltage drop across the capacitor is measured and is taken as a value of the energy consumption when carrying out said relative movement.
  • the condition of the capacitor may also be tested, i.e. that it can provide the energy required for the control of the electric switching device through the electric actuating member.
  • a detector of the position of the mutual position of the contacts is checked by checking that the position detector delivers a reading when simultaneously a movement of a moveable part of the electric actuating member is detected.
  • the good function of the position detector may be directly decisive for a functioning on the hole of electric switching devices of some types, since very accurate co-ordination of movement they have to carry out with for example the phase position of an alternating current may be required for the correct function of the electric switching device.
  • ap- plied to en electric switching device adapted to be closed and conduct a current therethrough during normal operation of the electric plant
  • the temperature of at least one of two contacts of the electric switching device and the current through the electric switching device are measured, and these values are compared with expected values therefor so as to determine the condition of the electric switching device with respect to the contact resistance thereof. It may by this be determined whether the contact resistance of the switching device has become to high, and suitable measures have to be taken for reducing this. Such a too high contact resistance may cause unnecessary power losses and heating of the electric switching device and a possibly damage thereof may occur if the temperatures will be too high.
  • Another way to determine the contact resistance is to measure the voltage between the two contacts of the electric switching de- vice and the current through the electric switching device and compare these values with expected values therefor.
  • an electric switching device adapted to be closed and conduct a current therethrough during normal operation of the electric plant
  • at least one part connected to one of two contacts of the switching device moveable with respect to each other is brought to move while the two contacts maintain their mutual contact.
  • ap- plied to an electric switching device adapted to keep the current path therethrough broken during normal operation of the electric plant said checking may in a corresponding way take place by carrying out a relative movement of two contacts of the electric switching device while keeping these contacts out of contact with each other and by that preventing current from flowing through the switching device.
  • a condition check is intended to take place for an electric switch- ing device for alternating current comprising two branches connected in parallel in the current path therethrough, in which a first one of them comprises a first contact member having two movable contacts movable with respect to each other for opening and closing and the second one comprises an element with ability to block current therethrough in at least one blocking direction and conduct current therethrough in at least one direction, in which a second contact member having two contacts movable with respect to each other for opening and closing is connected in series with said element, in which the switching device is adapted to break the current in the current path by the fact that the first contact member is controlled to open for transferring the current to said element when this is in or going into a conducting state and then the second contact member to open when said element is in a state of blocking current there- through after a zero-crossing of the current, and in which the electric switching device is associated with an electric actuating member adapted to cause a relative movement of the movable contacts, in which the checking is carried
  • a function checking of all parameters impor- tant for the good function of the electric switching device may take place by this without influencing the operation of the electric plant in any way.
  • This has a great importance for this type of electric switching devices, since it is important to carry out the breaking in a correct way when fault currents occur so as to keep damages of the surrounding equipment and of parts included in the electric switching device on a level being as low as possible.
  • the moveable contacts of the first contact member may be moved with respect to each other while maintaining a contact therebetween in said checking, but it would also be possible to control the electric actuating member to move the moveable contacts of the first contact member out of engagement with each other in said checking for transferring the current to said member and then move them back for establishing contact therebetween again before said element arrives to the blocking state.
  • a very short relative movement between the two contacts is probably enough for checking the condition of the electric switching device entirely, but it would also be possible to use the embodiment last mentioned when particular needs are there.
  • said condition check is controlled by the electronic unit.
  • Exactly the combination of an electric actuating member for movement of contacts of the elect ⁇ c switching device and an electronic unit for control of the electric actuating member results in extraordinary possibilities to easily carry out condition checks of an electric switching device nearly as often as desired.
  • the electronic unit may be "programmed" to carry out these checkings at regular time intervals or be controlled to do this through signals which may be sent out for example from an operation central being remotely located.
  • the parameters used when carrying out the checking may then be collected from sig- nals to or in the electronic unit and accordingly be such that the electric unit in any case knows all the time for deciding whether the electric switching device shall be controlled or not.
  • condition check results in a determined condition of the electric switching device deviating in any way from the expected condition to call for attention by triggering an alarm or the like, which is then controlled by the electronic unit.
  • the invention also relates to an apparatus, a computer program and a computer program product according to the corresponding appended claims. It is easily understood that the method according to the invention defined in the appended set of method claims is well suited to be carried out through program instruc- tions from a processor which may be influenced by a computer program provided with the program steps in question. This is particularly the case in the embodiments with an electronic unit included in the electric switching device, since it is very suitable to program this electronic unit to carry out the condition check.
  • the invention comprises such apparatuses, computer programs and computer program products combined with a method according to any of the appended method claims.
  • the invention also relates to a device for checking the condition of an electric switching device arranged in the current path of an electric plant, said switching device being controllable between positions for closing and breaking the current path, according to the appended device claims.
  • Fig 1 is a very schematic view illustrating the construction of a device for condition check of an electric switching device and explains a method for such condition check according to a preferred embodiment of the invention
  • Fig 2 is a simplified view illustrating the construction of an electric switching device for alternating current with a device for condition check connected thereto,
  • Fig 3 and 4 are views corresponding to fig 2 illustrating methods according to two preferred embodiments of the invention for condition check of the electric switching device
  • Fig 5 and 6 are very simplified views illustrating a method according to the invention for condition check of an electric switching device of another type than the one illustrated in fig 2
  • Fig 7-10 are also very simplified views illustrating a method according to the invention for condition check of an electric switching device of conventional type.
  • An electric switching device is indicated at 1 in fig 1 .
  • An electric actuating member 2 in the form of an electric motor schemati- cally indicated is co-ordinated with this electric switching device so as to control two contacts 3, 4 of the electric switching device moveable with respect to each other between a position closing and breaking the current path 5, in which it is arranged. It is then advantageous that the electric switching device is adapted to be closed and conduct current therethrough during normal operation of the electric plant, but it is also possible that it may instead be arranged to keep the current path broken during normal operation.
  • the electric motor 2 receives electric energy for actuating the electric switching device from an energy storing member 6, which here is constituted by a capacitor. The direct voltage from the capacitor is converted by an inverter 7 to an alternating voltage for operation of the motor 2.
  • An electronic unit 8 is also co-ordinated with the electric switching device for controlling the electric motor 2.
  • a position detector 9 is adapted to detect the position of a moveable contact 4 of the electric switching device and send information thereabout to the electronic unit 8.
  • a member 10 is adapted to measure the current from the inverter 7 to the electric motor 2.
  • a member 11 is adapted to measure the voltage across the capacitor 6 so as to in that way be able to judge how much energy has been tapped therefrom when controlling the electric actuating member 2.
  • Information from the means 9-1 1 is sent to the electronic unit 8. It is also indicated that a member 12 is adapted to detect the magnitude of the current in the current path 5 and send informa- tion thereabout to the electronic unit 8.
  • the electronic unit 8 is adapted to take decisions with respect to whether the electric switching device shall be controlled to go from the normal position thereof, i.e. a position closing or breaking the current path, to the other of these two positions, on the basis of information received from the detecting member 12.
  • the switching device by hand to change position by pressing a button not shown. Signals from the button may then go to the electronic unit through the detecting member.
  • the electronic unit is adapted to carry out a condition check of the electric switching device 1 at regular time intervals. This may be done by the fact that it controls the inverter 7 to deliver electric energy from the capacitor 6 to the electric actuating member 2 so that the contacts 3, 4 of the electric switching device move with respect to each other without changing the influence of the electric switching device upon the electric plant to which it belongs. This means that if the electric switching device normally is adapted to let the current in the current path flow therethrough, this will continue to do so also during the condition check. It is in this way possible to check the condition of the electric switching device through the electronic unit 8, i.e.
  • the electronic unit receives through the member 10 information about the current required by the electric motor for carrying out the movement, and the torque required for the movement of the contacts may be calculated through this information. In the case that the contacts bear against each other during said movement this is then a value of the friction between the contacts.
  • the electronic unit may through an alarm unit 13 tell that maintenance of the electric switching device is necessary.
  • the friction between the contacts may be kept down by the fact that oxide layers possibly formed thereon may be scraped off during such a check, so that such a maintenance may be avoided.
  • the position detector 9 is adapted to send information about the position of the moveable contact 4 to the electronic unit 8 when checking the condition. It may by this be determined whether the position detector functions as it shall. Furthermore, the elec- tronic unit 8 may through information received from the voltage measuring member 1 1 check that there is sufficient energy in the capacitor 6 for controlling the electric switching device by measuring the voltage drop across the capacitor when actuating the device for said condition check. Thus, it may in this way be checked that when a certain movement is ordered through the electronic unit 8 this is also obtained, i.e. that the actuation of the electric switching device functions as it shall. A measure of the overall condition of the electric switching device may also be obtained by a possibility to determine the contact friction and testing the position detector and the energy storage.
  • An electric switching device in the form of a so-called hybrid breaker for which the method for condition check according to the invention is particularly well suited is schematically illus- trated in fig 2.
  • This electric switching device 1 is switched in in a current path 5 for being able to rapidly break a current therethrough by opening it.
  • the electric switching device is intended for alternating current and one such switching device is arranged per phase, so that a three phase network has three such switching devices on one and the same location.
  • the switching device has an inner cylinder 14, which is rotatably arranged around an axle 15 and has a moveable contact 4.
  • a second cylinder 16 is arranged outside the cylinder 14 and has four contacts 3, 3' , 3" and 3'" arranged along the movement path of the moveable contact 4 and to form good electric contacts while bearing against the moveable contact 4.
  • the switching device is switched in in the current path through the two outer contacts 3 and 3'", respectively.
  • a semiconductor device in the form of a diode 17, 18 is con- nected between the two outer contacts and the adjacent inner contact with the conducting direction from the outer to the adjacent contact.
  • the diodes could just as well be both directed with the conducting direction towards the outer contact.
  • the switching device has also an electric actuating member 19 adapted to drive the inner cylinder 14 to rotate for movement of the moveable contact 4 with respect to the other contacts 3-3'".
  • Members 12 are arranged to measure the current in the current path 5 and send information thereabout to the electronic unit 8 for controlling the electric motor 19 on the basis thereof.
  • the device has also a position detector 20 adapted to detect the actual position of the cylinder 14 and by that also of the move- able contact 4.
  • the electronic unit 8 may be adapted to achieve a condition check of this electric switching device during operation of the electric plant in which the current path 5 is a part by controlling the electric motor 19 and then carry out measurements of at least one parameter associated with the condition of the electric switching device. It is illustrated in fig 3 how this electric motor 19 for such a condition check controls the moveable contact 4 to carry out a sliding movement along the fixed contact 3 while maintaining the contact therewith.
  • the function of the electric switching device and the influence upon the current in the current path 5 is by that not changed at all, but important information about the condition of the electric switching device may be obtained.
  • the position detector 20 may send information to the electric unit 8 about the size of the actual movement taken place.
  • This information may be compared with the ordered movement for checking that the actuation of the electric switching device functions as it shall.
  • Other condition parameters of the electric switching device and the actuating circuit thereof may at the same time be calculated in a way described with ref- erence to fig 1 . It is illustrated in fig 4 how it principally would be possible to continue the movement of the moveable contact 4 for said condition check of the electric switching device so that the contacts 3, 4 of the first contact member are moved out of engagement with each other, so that the current is transferred to the member 17, but it would then be necessary that the electric motor 19 is controlled to move the contact 4 back for establishing contact with the contact 3 again before the member 17 arrives to the blocking state.
  • a method according to the invention may be applied on another type of electric switching device 1 for condition check thereof.
  • Parts having correspondence in the device according to fig 1 have here been provided with the same reference numerals.
  • the two contacts 3, 4 of the electric switching device are adapted to bear under pretension against each other through a spring member 21 schematically indicated in normal operation of the electric switching device.
  • the electric motor 2 is adapted to control the moveable contact 4 to such a movement for said condition check that the spring member is allowed to release a determined amount of potential energy being below the level required for a separation of the contacts, so that for example the position according to fig 6 is obtained. It may through the position detector 9 be checked that the movement ordered by the electronic unit has really taken place.
  • FIG. 7-10 It is illustrated in fig 7-10 how a method according to the invention may be applied to an electric switching device 1 of conven- tional type with a rectilinear relative movement of the two contacts. Parts having correspondence in the device according to fig 1 have here been provided with the same reference numerals.
  • the case in which the electric switching device is adapted to be closed and conduct current therethrough during normal operation (fig 7) of the electric plant is illustrated in fig 7 and 8.
  • the electric motor 2 is for said condition check adapted to con- trol the moveable contact 4 to such a movement that the electric switching device remains closed, such as to the position according to fig 8. Any of the parameters discussed above is simultaneously-measured for the condition check.
  • the electronic unit 8 is preferably through a suitable programming adapted to entirely autonomously control the condition check of the electric switching device 1 . It may be designed to do this automatically at predetermined points of time, so that possible faults of the function of the electric switching device, i.e. actually the actuating circuit thereof, may be discovered before the electric switching device shall carry out the task it is intended for, which may be expected to take place at very long time intervals.
  • any maintenance really has to be carried out on the electric switching device and the actuating circuit thereof the electric unit sends information thereabout to for example an operation central through an alarm system.
  • the invention also relates to such a condition check of an electric switching device which may take place without any movement between the two contacts moveable with respect to each other. It is then for example possible to measure the contact resistance between two contacts of the switching device by meas- uring the current through the switching device and the voltage between the contacts. Another possibility is to measure the tern- perature of the contacts and the current therethrough. The temperature at a given current magnitude is also a measure of the contact resistance.
  • the invention is applicable to electric switching devices intended for all conceivable levels of voltages and currents, even if it is particularly well suited for condition check of electric switching devices in a current path in switch gears for electricity supply within industry, distribution or transmission networks having a voltage in the current path on intermediate and high voltage level, i.e. between 1 and 800 kV. Furthermore, the invention is particularly applicable to electric switching devices adapted to be able to take an operation current of 1 kA, prefer- able 4 kA.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

L'invention a trait à un procédé de contrôle de l'état d'un dispositif de commutation électrique (1) disposé dans le trajet de courant d'une installation électrique, ledit dispositif étant contrôlable entre des positions de fermeture et d'interruption du trajet de courant (5). Le contrôle est effectué lors du fonctionnement de l'installation électrique au moyen d'une mesure d'au moins un paramètre associé à l'état du dispositif sans que cela ait d'influence sur le fonctionnement.
PCT/SE2001/001932 2000-09-18 2001-09-11 Procede et appareil de controle de l'etat d'un dispositif de commutation electrique Ceased WO2002023207A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001282841A AU2001282841A1 (en) 2000-09-18 2001-09-11 A method and a device for checking a condition of an electric switching device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0003304-3 2000-09-18
SE0003304A SE0003304D0 (sv) 2000-09-18 2000-09-18 Förfarande samt anordning för tillståndskontroll av en elektrisk kopplare

Publications (1)

Publication Number Publication Date
WO2002023207A1 true WO2002023207A1 (fr) 2002-03-21

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PCT/SE2001/001932 Ceased WO2002023207A1 (fr) 2000-09-18 2001-09-11 Procede et appareil de controle de l'etat d'un dispositif de commutation electrique

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Country Link
AU (1) AU2001282841A1 (fr)
SE (1) SE0003304D0 (fr)
WO (1) WO2002023207A1 (fr)

Cited By (8)

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Publication number Priority date Publication date Assignee Title
WO2004021382A3 (fr) * 2002-08-28 2004-07-01 Teravicta Technologies Inc Amelioration de la performance d'un commutateur micro-electromecanique
EP1555683A1 (fr) * 2004-01-15 2005-07-20 ABB Technology AG Procédé pour contrôler un disjoncteur
WO2005073992A1 (fr) * 2004-01-30 2005-08-11 Abb Technology Ltd. Moniteur d'etat destine a un dispositif de distribution electrique
EP1953780A1 (fr) * 2007-02-02 2008-08-06 Abb Research Ltd. Dispositif de commutation électrique, son utilisation et procédé de commutation
WO2009074856A1 (fr) * 2007-12-13 2009-06-18 Bticino S.P.A. Entraînement par moteur électrique avec accumulation d'énergie électrique pour dispositifs de commutation
CN103675667A (zh) * 2013-12-17 2014-03-26 北京合锐赛尔电力科技有限公司 负荷开关电寿命监测系统及方法
EP3428666A1 (fr) * 2017-07-13 2019-01-16 Schneider Electric Industries SAS Dispositif de commutation électrique et procédé de détection d'usure associé
WO2020229128A1 (fr) * 2019-05-15 2020-11-19 Maschinenfabrik Reinhausen Gmbh Ensemble commutateur et procédé pour faire fonctionner un ensemble commutateur de manière sûre

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SE445274B (sv) * 1981-12-14 1986-06-09 Asea Ab Anordning for overvakning av konditionen hos elektriska kontakter med strombrytande kontakter, i synnerhet lindningsomkopplare
US4754360A (en) * 1985-05-07 1988-06-28 Nipponkouatsudenki Kabushikikaisha Arc extinguishing apparatus having sensing of initial arc
EP0338374A2 (fr) * 1988-04-16 1989-10-25 Asea Brown Boveri Aktiengesellschaft Procédé et dispositif de commande d'une installation d'actionnement d'un disjoncteur de moyenne ou haute tension
SE461553B (sv) * 1988-12-16 1990-02-26 Bertil Goeransson Provapparat foer elektriska hoegspaenningsbrytare
DE4326640A1 (de) * 1993-08-09 1995-02-16 Daimler Benz Ag Meßeinrichtung für den Weg eines beweglichen Teils an einem elektrischen Schaltgerät und Verfahren zum Betrieb eines Schaltgeräts mit einer Meßeinrichtung
US5566041A (en) * 1995-04-17 1996-10-15 Houston Industries Incorporated Zero-sequence opening of power distribution

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE445274B (sv) * 1981-12-14 1986-06-09 Asea Ab Anordning for overvakning av konditionen hos elektriska kontakter med strombrytande kontakter, i synnerhet lindningsomkopplare
US4754360A (en) * 1985-05-07 1988-06-28 Nipponkouatsudenki Kabushikikaisha Arc extinguishing apparatus having sensing of initial arc
EP0338374A2 (fr) * 1988-04-16 1989-10-25 Asea Brown Boveri Aktiengesellschaft Procédé et dispositif de commande d'une installation d'actionnement d'un disjoncteur de moyenne ou haute tension
SE461553B (sv) * 1988-12-16 1990-02-26 Bertil Goeransson Provapparat foer elektriska hoegspaenningsbrytare
DE4326640A1 (de) * 1993-08-09 1995-02-16 Daimler Benz Ag Meßeinrichtung für den Weg eines beweglichen Teils an einem elektrischen Schaltgerät und Verfahren zum Betrieb eines Schaltgeräts mit einer Meßeinrichtung
US5566041A (en) * 1995-04-17 1996-10-15 Houston Industries Incorporated Zero-sequence opening of power distribution

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021382A3 (fr) * 2002-08-28 2004-07-01 Teravicta Technologies Inc Amelioration de la performance d'un commutateur micro-electromecanique
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