EP1983295B1 - Device for protecting an oscillating power circuit - Google Patents

Device for protecting an oscillating power circuit Download PDF

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Publication number
EP1983295B1
EP1983295B1 EP07290482.4A EP07290482A EP1983295B1 EP 1983295 B1 EP1983295 B1 EP 1983295B1 EP 07290482 A EP07290482 A EP 07290482A EP 1983295 B1 EP1983295 B1 EP 1983295B1
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EP
European Patent Office
Prior art keywords
current
protection device
triggering
power circuit
circuit breaking
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Not-in-force
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EP07290482.4A
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German (de)
French (fr)
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EP1983295A1 (en
Inventor
Guillaume Huet
François Orquera
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Nexter Systems SA
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Nexter Systems SA
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Priority to EP07290482.4A priority Critical patent/EP1983295B1/en
Publication of EP1983295A1 publication Critical patent/EP1983295A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H11/00—Defence installations; Defence devices
    • F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H11/00—Defence installations; Defence devices
    • F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
    • F41H11/13—Systems specially adapted for detection of landmines
    • F41H11/136—Magnetic, electromagnetic, acoustic or radiation systems, e.g. ground penetrating radars or metal-detectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H11/00—Defence installations; Defence devices
    • F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
    • F41H11/16—Self-propelled mine-clearing vehicles; Mine-clearing devices attachable to vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G7/00—Mine-sweeping; Vessels characterised thereby
    • B63G7/02—Mine-sweeping means, Means for destroying mines
    • B63G7/06—Mine-sweeping means, Means for destroying mines of electromagnetic type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits

Definitions

  • the technical field of the invention is that of devices for protecting oscillating power circuits.
  • circuits including oscillating may be degraded by the presence of a direct current.
  • the coils used in the electromagnetic demining devices are sensitive to DC currents which may, after a certain time, deteriorate them, even if these currents have a level of intensity which is below a given threshold.
  • the document US Patent 5060166 is able to reliably determine the amplitude (overcurrent) and the phase of the alternating current despite the presence of a DC component. The absence of alternations or oscillations is not detected, let alone a triggering of the breaking means in response to the disappearance of oscillations.
  • the object of the invention is to propose a protection device making it possible to protect against the appearance of such continuous currents.
  • the subject of the invention is a device for protecting an oscillating power circuit, in particular a demining coil, according to claim 1.
  • the means for measuring and analyzing the current may comprise a logic module incorporating a resettable monostable component, the switching of which is periodically controlled by the variation of the supply network current, a component whose switching off command controls the appearance an error signal that is used by the triggering means to cause the opening of the breaking means.
  • the means of measurement and analysis may also include a measurement module ensuring an evaluation of the value of the current of the supply network, the measuring module comprising a comparator means for comparing the measured value with a predefined threshold, the result of this comparison being used by the triggering means to cause the opening of the breaking means.
  • the triggering means will also be connected to a display means making it possible to highlight the state of the breaking means.
  • the invention also relates to the application of such a device to the protection of a de-mining coil.
  • a protection device 1 comprises a cut-off means 2 which is placed on a power conductor 3 connected to an AC supply network R, for example the network of a vehicle.
  • the breaking means 2 is arranged upstream of a power circuit 4 which here comprises a power box 5 connected to a demining coil 6.
  • a control box 7 is arranged upstream of the cutoff means 2. It controls the shape of the signals generated by the coil 6 and it comprises a man-machine interface for controlling the demining device.
  • the device 1 also comprises a means 8 for measuring and analyzing the current intended to supply the power circuit 4.
  • This measuring means 8 is connected to a triggering means 9 which makes it possible to control the opening of the breaking means 2.
  • the measuring means 8 is designed so as to detect the appearance of a direct current in the power conductor 3.
  • a display means 10 is also connected to the triggering means 9 and it makes it possible to highlight the open or closed state of the breaking means 2.
  • This display means 10 may, for example, comprise two LEDs of different colors, a light color corresponding to the open position of the breaking means 2 and the other to the closed position.
  • the figure 2 shows in a more precise way the organic and functional structure of the device 1.
  • the means 8 for measuring and analyzing the current comprises two different modules: a logic module 12 and a measurement module 13.
  • the logic module 12 incorporates a re-engagable monostable component 14 (for example a component known under the standard name 74HC4538).
  • the logic output of this component alternates with a frequency which is that of the current flowing in the power conductor 3.
  • This monostable 14 is connected to a state detector 15 (for example a flip-flop D) which makes it possible to identify a stop of the tilting of the monostable 14.
  • the stop of this tilting corresponds to the stop of the oscillation of the current which means either that there is no current flowing in the power conductor 3, or that this current is continuous.
  • the state detector 15 then provides an error signal (for example a transition to a logic state 1), which signal is applied to the tripping means 9 via an OR logic gate 16.
  • the triggering means 9 then causes the opening of the breaking means 2.
  • the state detector may be embodied as a specific electronic component (for example a component known under the standardized name 74HC74). It may simply consist of a software module incorporated in a computer, a module programmed to detect the stop of the oscillations of the output of the monostable 14. Such a computer may also be programmed to monitor forms of more complex currents .
  • the triggering means 9 may for example be constituted by a control circuit of the opening of the breaking means 2. If the breaking means 2 is constituted by a static switch such as a thyristor, the triggering means 9 may be for example the electronic control circuit of the trigger of this thyristor.
  • the measurement module 13 comprises a means 17 providing a measurement of the value of the current flowing in the supply network and the conductor 3.
  • the current measuring components are well known to those skilled in the art and may be of analog technology or digital.
  • the measurement module 13 also comprises a memory or register 18 inside which is incorporated a threshold value.
  • the measurement module finally comprises a comparator 19 which compares the value measured by the means 17 with the threshold contained in the memory 18.
  • the comparator is designed to deliver a signal (for example a logic state 1), which signal will be applied to the triggering means 9 via the logic gate 16.
  • the memory 18 in the form of calibrated electronic components incorporated in an analog comparator 19 made for example in the form of a bridge.
  • the breaking means 2 is actuated both when a level is excessive current than when the current changes from the alternating state to the continuous state.
  • the device according to the invention also ensures a cut-off of the power circuits when the current is stopped. This improves the insulation and protection of the circuit outside the phases of use.
  • a logic module 12 that can detect a continuous component superimposed on an oscillating signal. It will suffice to add at the level of the logic module 12, and parallel to the means 14 and 15, a stage comprising a filter eliminating the AC component followed by an evaluator measuring the DC component. This evaluator will include a comparator connected to another memory in which a threshold level of the DC component will be programmed.
  • the various means constituting the device 1 will advantageously be made in whole or in part using a microprocessor or computer which will include software means to ensure on the one hand the comparison of the intensity level current with a preprogrammed threshold and secondly to detect the stop current oscillations.
  • the invention has been described in its application to the protection of a demining coil. It can of course be applied to the protection of other types of electronic circuits degraded by direct current.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

Le domaine technique de l'invention est celui des dispositifs de protection de circuits de puissance oscillants.The technical field of the invention is that of devices for protecting oscillating power circuits.

Il est classique de protéger un circuit de puissance contre les surtensions en prévoyant un organe de coupure pouvant détecter la surtension, par exemple un disjoncteur ou bien un fusible.It is conventional to protect a power circuit against overvoltages by providing a switching device capable of detecting overvoltage, for example a circuit breaker or a fuse.

Cependant certains circuits notamment oscillants risquent de se trouver dégradés par la présence d'un courant continu.However some circuits including oscillating may be degraded by the presence of a direct current.

Par exemple, les bobines utilisées dans les dispositifs de déminage électromagnétiques (tel que décrit notamment par le brevet FR2750204 ) sont sensibles aux courants continus qui peuvent au bout d'un certain temps les détériorer, même si ces courants ont un niveau d'intensité qui est inférieur à un seuil donné. Le document US-A-5060166 est apte à déterminer de façon fiable l'amplitude (surintensité) et la phase du courant alternatif malgré la présence d'une composante continue. L'absence d'alternances ou d'oscillations n'est pas détectée et encore moins un déclenchement du moyen de coupure en réponse à la disparition d'oscillations.For example, the coils used in the electromagnetic demining devices (as described in particular by the patent FR2750204 ) are sensitive to DC currents which may, after a certain time, deteriorate them, even if these currents have a level of intensity which is below a given threshold. The document US Patent 5060166 is able to reliably determine the amplitude (overcurrent) and the phase of the alternating current despite the presence of a DC component. The absence of alternations or oscillations is not detected, let alone a triggering of the breaking means in response to the disappearance of oscillations.

L'invention a pour but de proposer un dispositif de protection permettant d'assurer une protection contre l'apparition de tels courants continus.The object of the invention is to propose a protection device making it possible to protect against the appearance of such continuous currents.

Ainsi l'invention a pour objet un dispositif de protection d'un circuit de puissance oscillant, notamment d'une bobine de déminage, selon la revendication 1.Thus, the subject of the invention is a device for protecting an oscillating power circuit, in particular a demining coil, according to claim 1.

Le moyen de mesure et d'analyse du courant pourra comprendre un module logique incorporant un composant monostable re-enclenchable dont le basculement est commandé périodiquement par la variation du courant du réseau d'alimentation, composant dont l'arrêt de basculement commande l'apparition d'un signal d'erreur qui est utilisé par le moyen de déclenchement pour provoquer l'ouverture du moyen de coupure.The means for measuring and analyzing the current may comprise a logic module incorporating a resettable monostable component, the switching of which is periodically controlled by the variation of the supply network current, a component whose switching off command controls the appearance an error signal that is used by the triggering means to cause the opening of the breaking means.

Le moyen de mesure et d'analyse pourra également comporter un module de mesure assurant une évaluation de la valeur du courant du réseau d'alimentation, le module de mesure comportant un moyen comparateur assurant la comparaison de la valeur mesurée avec un seuil prédéfini, le résultat de cette comparaison étant utilisé par le moyen de déclenchement pour provoquer l'ouverture du moyen de coupure.The means of measurement and analysis may also include a measurement module ensuring an evaluation of the value of the current of the supply network, the measuring module comprising a comparator means for comparing the measured value with a predefined threshold, the result of this comparison being used by the triggering means to cause the opening of the breaking means.

Avantageusement le moyen de déclenchement sera relié également à un moyen de visualisation permettant de mettre en évidence l'état du moyen de coupure.Advantageously, the triggering means will also be connected to a display means making it possible to highlight the state of the breaking means.

L'invention vise également l'application d'un tel dispositif à la protection d'une bobine de déminage.The invention also relates to the application of such a device to the protection of a de-mining coil.

L'invention sera mieux comprise à la lecture de la description qui va suivre d'un mode particulier de réalisation, description faite en référence aux dessins annexés et dans lesquels :

  • la figure 1 est un schéma bloc représentant un dispositif selon l'invention,
  • la figure 2 est un schéma organico fonctionnel montrant de façon plus détaillée un mode de réalisation du dispositif selon l'invention.
The invention will be better understood on reading the following description of a particular embodiment, a description given with reference to the appended drawings and in which:
  • the figure 1 is a block diagram showing a device according to the invention,
  • the figure 2 is an organico-functional diagram showing in more detail one embodiment of the device according to the invention.

En se reportant à la figure 1, un dispositif de protection 1 selon l'invention comporte un moyen de coupure 2 qui est placé sur un conducteur de puissance 3 relié à un réseau R d'alimentation en courant alternatif par exemple le réseau d'un véhicule.Referring to the figure 1 , a protection device 1 according to the invention comprises a cut-off means 2 which is placed on a power conductor 3 connected to an AC supply network R, for example the network of a vehicle.

Le moyen de coupure 2 est disposé en amont d'un circuit de puissance 4 qui comporte ici un boîtier de puissance 5 relié à une bobine de déminage 6.The breaking means 2 is arranged upstream of a power circuit 4 which here comprises a power box 5 connected to a demining coil 6.

Un boîtier de commande 7 est disposé en amont du moyen de coupure 2. Il permet de piloter la forme des signaux engendrés par la bobine 6 et il comporte une interface homme machine permettant le pilotage du dispositif de déminage.A control box 7 is arranged upstream of the cutoff means 2. It controls the shape of the signals generated by the coil 6 and it comprises a man-machine interface for controlling the demining device.

Le dispositif 1 comprend également un moyen 8 de mesure et analyse du courant destiné à alimenter le circuit de puissance 4.The device 1 also comprises a means 8 for measuring and analyzing the current intended to supply the power circuit 4.

Ce moyen de mesure 8 est relié à un moyen de déclenchement 9 qui permet de commander l'ouverture du moyen de coupure 2.This measuring means 8 is connected to a triggering means 9 which makes it possible to control the opening of the breaking means 2.

Conformément à l'invention le moyen de mesure 8 est conçu de façon à pouvoir détecter l'apparition d'un courant continu dans le conducteur de puissance 3.According to the invention the measuring means 8 is designed so as to detect the appearance of a direct current in the power conductor 3.

Un moyen de visualisation 10 est lui aussi relié au moyen de déclenchement 9 et il permet de mettre en évidence l'état ouvert ou fermé du moyen de coupure 2.A display means 10 is also connected to the triggering means 9 and it makes it possible to highlight the open or closed state of the breaking means 2.

Ce moyen de visualisation 10 pourra par exemple comprendre deux voyants de couleurs différentes, une couleur de voyant correspondant à la position ouverte du moyen de coupure 2 et l'autre à la position fermée.This display means 10 may, for example, comprise two LEDs of different colors, a light color corresponding to the open position of the breaking means 2 and the other to the closed position.

Il est bien entendu possible, pour la commodité de mise en oeuvre du dispositif, de déporter le moyen de visualisation 10 au niveau du boîtier de commande 7 ou de son interface Homme Machine. On a représenté sur la figure 1 une liaison 11 en traits pointillés pour figurer une telle liaison vers un moyen de visualisation 10 déporté.It is of course possible, for the convenience of implementation of the device, to deport the display means 10 at the control unit 7 or its Man Machine interface. We have shown on the figure 1 a link 11 in dashed lines to include such a link to a remote display means 10.

La figure 2 montre d'une façon plus précise la structure organique et fonctionnelle du dispositif 1.The figure 2 shows in a more precise way the organic and functional structure of the device 1.

Le moyen 8 de mesure et d'analyse du courant comprend deux modules différents : un module logique 12 et un module de mesure 13.The means 8 for measuring and analyzing the current comprises two different modules: a logic module 12 and a measurement module 13.

Le module logique 12 incorpore un composant monostable ré-enclenchable 14 (par exemple un composant connu sous la dénomination normalisée 74HC4538). La sortie logique de ce composant alterne avec une fréquence qui est celle du courant circulant dans le conducteur de puissance 3.The logic module 12 incorporates a re-engagable monostable component 14 (for example a component known under the standard name 74HC4538). The logic output of this component alternates with a frequency which is that of the current flowing in the power conductor 3.

Ce monostable 14 est relié à un détecteur d'état 15 (par exemple une bascule D) qui permet de repérer un arrêt du basculement du monostable 14. L'arrêt de ce basculement correspond à l'arrêt de l'oscillation du courant ce qui signifie, soit qu'il n'y a plus de courant circulant dans le conducteur de puissance 3, soit que ce courant est continu. Le détecteur d'état 15 fournit alors un signal d'erreur (passage par exemple à un état logique 1), signal qui est appliqué au moyen de déclenchement 9 via une porte logique OU 16.This monostable 14 is connected to a state detector 15 (for example a flip-flop D) which makes it possible to identify a stop of the tilting of the monostable 14. The stop of this tilting corresponds to the stop of the oscillation of the current which means either that there is no current flowing in the power conductor 3, or that this current is continuous. The state detector 15 then provides an error signal (for example a transition to a logic state 1), which signal is applied to the tripping means 9 via an OR logic gate 16.

Le moyen de déclenchement 9 provoque alors l'ouverture du moyen de coupure 2.The triggering means 9 then causes the opening of the breaking means 2.

Le détecteur d'état pourra être réalisé sous la forme d'un composant électronique spécifique (par exemple un composant connu sous la dénomination normalisée 74HC74). Il pourra être simplement constitué par un module logiciel incorporé à un calculateur, module programmé de façon à détecter l'arrêt des oscillations de la sortie du monostable 14. Un tel calculateur pourra par ailleurs être programmé de façon à surveiller des formes de courants plus complexes.The state detector may be embodied as a specific electronic component (for example a component known under the standardized name 74HC74). It may simply consist of a software module incorporated in a computer, a module programmed to detect the stop of the oscillations of the output of the monostable 14. Such a computer may also be programmed to monitor forms of more complex currents .

Le moyen de déclenchement 9 pourra par exemple être constitué par un circuit de commande de l'ouverture du moyen de coupure 2. Si le moyen de coupure 2 est constitué par un interrupteur statique tel un thyristor, le moyen de déclenchement 9 pourra être par exemple le circuit électronique de commande de la gâchette de ce thyristor.The triggering means 9 may for example be constituted by a control circuit of the opening of the breaking means 2. If the breaking means 2 is constituted by a static switch such as a thyristor, the triggering means 9 may be for example the electronic control circuit of the trigger of this thyristor.

Le module de mesure 13 comporte un moyen 17 assurant une mesure de la valeur du courant circulant dans le réseau d'alimentation et le conducteur 3. Les composants de mesure du courant sont biens connus de l'Homme du Métier et peuvent être de technologie analogique ou numérique.The measurement module 13 comprises a means 17 providing a measurement of the value of the current flowing in the supply network and the conductor 3. The current measuring components are well known to those skilled in the art and may be of analog technology or digital.

Le module de mesure 13 comporte également une mémoire ou registre 18 à l'intérieur de laquelle est incorporée une valeur de seuil. Le module de mesure comporte enfin un comparateur 19 qui assure la comparaison de la valeur mesurée par le moyen 17 avec le seuil contenu dans la mémoire 18.The measurement module 13 also comprises a memory or register 18 inside which is incorporated a threshold value. The measurement module finally comprises a comparator 19 which compares the value measured by the means 17 with the threshold contained in the memory 18.

Le comparateur est conçu de façon à délivrer un signal (par exemple un état logique 1), signal qui sera appliqué au moyen de déclenchement 9 via la porte logique 16.The comparator is designed to deliver a signal (for example a logic state 1), which signal will be applied to the triggering means 9 via the logic gate 16.

On pourra sans sortir du cadre de l'invention définir la mémoire 18 sous la forme de composants électroniques calibrés incorporés dans un comparateur analogique 19 réalisé par exemple sous la forme d'un pont.Without departing from the scope of the invention define the memory 18 in the form of calibrated electronic components incorporated in an analog comparator 19 made for example in the form of a bridge.

On pourra plus simplement mettre en oeuvre un calculateur assurant une comparaison numérique du courant mesuré avec une valeur mise dans mémoire du calculateur. Cette solution présentera l'avantage de permettre une modification aisée du seuil par programmation.It will more simply be possible to implement a computer that provides a numerical comparison of the measured current with a value stored in the computer's memory. This solution will have the advantage of allowing easy modification of the threshold by programming.

On voit qu'avec l'invention le moyen de coupure 2 est actionné aussi bien lors de l'apparition d'un niveau d'intensité excessif que lorsque le courant passe de l'état alternatif à l'état continu.It can be seen that with the invention the breaking means 2 is actuated both when a level is excessive current than when the current changes from the alternating state to the continuous state.

Il en résulte un niveau de protection accru pour les composants dégradables par le courant continu.This results in an increased level of protection for DC degradable components.

On notera que le dispositif selon invention assure également une coupure des circuits de puissance lorsque le courant est stoppé. On améliore ainsi l'isolation et la protection du circuit en dehors des phases d'utilisation.It will be noted that the device according to the invention also ensures a cut-off of the power circuits when the current is stopped. This improves the insulation and protection of the circuit outside the phases of use.

Il est également possible de mettre en oeuvre un module logique 12 pouvant détecter une composante continue superposée à un signal oscillant. Il suffira pour cela d'ajouter au niveau du module logique 12, et en parallèle aux moyens 14 et 15, un étage comprenant un filtre éliminant la composante alternative suivi d'un évaluateur mesurant la composante continue. Cet évaluateur comportera un comparateur relié à une autre mémoire dans laquelle sera programmé un niveau de seuil de la composante continue.It is also possible to implement a logic module 12 that can detect a continuous component superimposed on an oscillating signal. It will suffice to add at the level of the logic module 12, and parallel to the means 14 and 15, a stage comprising a filter eliminating the AC component followed by an evaluator measuring the DC component. This evaluator will include a comparator connected to another memory in which a threshold level of the DC component will be programmed.

On pourra alors commander le moyen de coupure 2 lorsque le courant circulant dans le moyen de commande comportera une composante continue dépassant un niveau prédéterminé.It will then be possible to control the breaking means 2 when the current flowing in the control means includes a DC component exceeding a predetermined level.

L'invention a été décrite en référence à des figures schématiques qui ne préjugent pas des moyens techniques mis en oeuvre concrètement.The invention has been described with reference to schematic figures which do not prejudge the technical means implemented in practice.

Il est bien entendu que les différents moyens constituant le dispositif 1 seront avantageusement réalisés en tout ou partie à l'aide d'un micro processeur ou calculateur qui comportera des moyens logiciels permettant d'assurer d'une part la comparaison du niveau d'intensité du courant avec un seuil préprogrammé et d'autre part permettant de détecter l'arrêt des oscillations du courant.It is understood that the various means constituting the device 1 will advantageously be made in whole or in part using a microprocessor or computer which will include software means to ensure on the one hand the comparison of the intensity level current with a preprogrammed threshold and secondly to detect the stop current oscillations.

L'invention a été décrite dans son application à la protection d'une bobine de déminage. Elle peut bien entendu être appliquée à la protection d'autres types de circuits électroniques dégradés par le courant continu.The invention has been described in its application to the protection of a demining coil. It can of course be applied to the protection of other types of electronic circuits degraded by direct current.

Claims (5)

  1. A protection device for an oscillating power circuit (4), namely for a demining coil (6), such device incorporating circuit breaking means (2) positioned between an alternating current supply network (R) and the power circuit (4), such device wherein it comprises at least one means (8) to measure and analyse the current supplying the power circuit, means able to detect the ceasing of the alternating current and preferably the appearance of a direct current, said means being connected to triggering means (9) ensuring the opening of the circuit breaking means (2) when the ceasing of the alternating current or the appearance of the direct current is detected.
  2. A protection device according to Claim 1, wherein the means (8) to measure and analyse the current comprise a logic module (12) incorporating a retriggerable monostable component (14) whose tripping is controlled periodically by the variation in the current from the supply network, such component wherein the suspension of tripping controls the appearance of an error signal used by the triggering means (9) to cause the opening of the circuit breaking means (2).
  3. A protection device according to one of Claims 1 or 2, wherein the measurement and analysis means (8) incorporate a measurement module (13) ensuring an estimation of the value of the current from the supply network, the measurement module incorporating comparator means (19) ensuring the comparison of the measured value with a predetermined threshold, the result of this comparison being used by the triggering means (9) to cause the opening of the circuit breaking means (2).
  4. A protection device according to one of Claims 1 to 3, wherein the triggering means (9) are also connected to display means (10) enabling the state of the circuit breaking means to be displayed (2).
  5. Application of the protection device according to one of Claims 1 to 4 to the protection of a demining coil (6).
EP07290482.4A 2007-04-19 2007-04-19 Device for protecting an oscillating power circuit Not-in-force EP1983295B1 (en)

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EP07290482.4A EP1983295B1 (en) 2007-04-19 2007-04-19 Device for protecting an oscillating power circuit

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Application Number Priority Date Filing Date Title
EP07290482.4A EP1983295B1 (en) 2007-04-19 2007-04-19 Device for protecting an oscillating power circuit

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EP1983295A1 EP1983295A1 (en) 2008-10-22
EP1983295B1 true EP1983295B1 (en) 2019-01-30

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EP07290482.4A Not-in-force EP1983295B1 (en) 2007-04-19 2007-04-19 Device for protecting an oscillating power circuit

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Publication number Priority date Publication date Assignee Title
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GB917896A (en) * 1959-09-28 1963-02-06 Philips Electrical Ind Ltd Improvements in or relating to devices for safeguarding against pulsating direct current a load to be fed with alternating current
DE1965483B2 (en) * 1969-12-30 1971-12-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt PROCEDURE FOR FLOW MONITORING OF AN ALMOST RECTANGULAR AC VOLTAGE AND ARRANGEMENT FOR PERFORMING THE PROCEDURE
US4556842A (en) * 1983-07-26 1985-12-03 Westinghouse Electric Corp. Tracking filter for sensing DC content in an AC waveform
US5060166A (en) * 1989-12-06 1991-10-22 Abb Power T&D Company Inc. Method and apparatus for rapidly analyzing AC waveforms containing DC offsets
FR2750204B1 (en) * 1996-06-19 1998-08-07 Giat Ind Sa DEMINING COIL AND DEVICE FOR DEMINING THE SAME

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None *

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