EP1168398A1 - Method of syncronisation of switching operation of a circuit breaker with voltage waveform - Google Patents

Method of syncronisation of switching operation of a circuit breaker with voltage waveform Download PDF

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Publication number
EP1168398A1
EP1168398A1 EP01401460A EP01401460A EP1168398A1 EP 1168398 A1 EP1168398 A1 EP 1168398A1 EP 01401460 A EP01401460 A EP 01401460A EP 01401460 A EP01401460 A EP 01401460A EP 1168398 A1 EP1168398 A1 EP 1168398A1
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Prior art keywords
circuit breaker
pressure
switching
instant
measurement
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EP01401460A
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German (de)
French (fr)
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EP1168398B1 (en
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Joseph Martin
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Grid Solutions SAS
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Alstom SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H33/563—Gas reservoirs comprising means for monitoring the density of the insulating gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/593—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for ensuring operation of the switch at a predetermined point of the ac cycle

Definitions

  • the invention relates to a method of synchronizing the operation of a gas-insulated circuit breaker with the voltage wave across the circuit breaker to obtain switching of the circuit breaker at a target instant as close as possible to a corresponding predetermined instant. at a certain level of amplitude of the voltage wave.
  • Such synchronization allows for example to close the circuit breaker when the level of the voltage wave across the circuit breaker is close to zero.
  • a graph has been illustrated over time of the alternating voltage wave TR at the terminals of the circuit breaker and for one phase of the circuit breaker.
  • t0 indicates the instant when a switching order is sent to the circuit breaker control
  • t1 indicates the instant from which the operation of the circuit breaker is engaged by the command
  • tc indicates the instant of circuit breaker switching .
  • the instant tc corresponds to an instant when the voltage is zero.
  • Instants t1 and tc are separated by a time interval te corresponding to the compensated operating time tmc calculated by the synchronization device from readings of the ambient temperature, the supply voltage of the control auxiliaries, etc. ..
  • the instants t0 and t1 are separated by a time interval td corresponding to a time delay for engaging the operation to ensure synchronization of the switching at zero voltage following the switching order.
  • the curves C1 and C2 are the two characteristic curves of the dielectric strength of the circuit breaker (or of pre-striking of the electric arc between the two contacts of the circuit breaker) and express that the dielectric strength of the circuit breaker decreases as the contacts of the circuit breaker move towards each other until the circuit breaker is completely closed.
  • the target switching time tc is calculated by taking account of the curve C1 and it follows that this target time is offset from the voltage zero and that the switching of the circuit breaker will intervene at a time when the voltage across the circuit breaker is not zero.
  • curves C1 and C2 in FIG. 2 it can be seen that the switching takes place at a time when the voltage is between 0.16 and 0.19 of the nominal voltage and in practice close to 0.19 of the nominal voltage.
  • the object of the invention is to propose an improved synchronization method which makes it possible to obtain switching as close as possible to zero voltage (or to another chosen level of the voltage wave). More particularly, the object of the invention is to optimize the calculation of the target instant.
  • the subject of the invention is a method of synchronizing the operation of a gas-insulated circuit breaker with the voltage wave applied to the terminals of the circuit breaker to obtain switching of the circuit breaker at a closest calculated target instant. possible from an instant corresponding to a certain level of amplitude of the voltage wave, characterized in that a measurement of the pressure of the insulating gas in the circuit breaker is carried out just before said switching, and in that said measurement is used in conjunction with prerecorded data representative of the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure of said insulating gas in order to optimize the calculation of said target instant.
  • the dielectric characteristic of the circuit breaker varies as a function of the pressure of the insulating gas between two extreme values, C1 corresponding to the value of the critical pressure (minimum value) and C2 corresponding to the value of nominal pressure. Between these two values extremes, the dielectric characteristic C of the circuit breaker varies as a function of the pressure of the insulating gas.
  • FIG. 2 shows that in the prior art, the optimum target time was calculated as a function of the value C1. But if the pressure of the insulating gas in the circuit breaker is measured just before the operation for switching the circuit breaker, it is possible to calculate a target instant closer to zero voltage than the target instant given by the curve C1.
  • a measurement of the hydraulic pressure is carried out just before the switching of the circuit breaker, and said measurement of the hydraulic pressure is used in conjunction with prerecorded data representative of the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure of the hydraulic fluid in order to optimize the calculation of said target instant.
  • the representation of the evolution of the dielectric characteristic of a circuit breaker as a function of the variation of the pressure of the hydraulic fluid is similar to that corresponding to the variation of the pressure of the insulating gas with the difference that it is also proportional to the speed of movement of the contacts, which itself depends on the pressure of the hydraulic fluid in the hydraulic control.
  • FIG. 1 is a graph illustrating the synchronization of the switching of a circuit breaker with the voltage wave across the terminals of the circuit breaker.
  • FIG. 2 is a graph illustrating the limits of a synchronization of the switching of the circuit breaker by compensation for the operating time of the circuit breaker.
  • FIG. 3 is a graph illustrating the taking into account of the pressure of the insulation gas in the synchronization of the operation of the circuit breaker.
  • FIG. 2 shows that in the prior art, the target instant tc is calculated as a function of the curve C1.
  • the voltage wave in absolute value for a phase at the terminals of a circuit breaker is represented by the curve TR.
  • the curve C1 presented above in relation to FIG. 2 defines a first target instant tc1 of the switching which is relatively distant from the instant when the level of the voltage wave is zero.
  • the curve C2 also presented above in relation to FIG. 2 defines the optimum target instant tc2 of the switching which is closest to the instant when the level of the voltage wave is zero. This optimum instant tc2 corresponds to the nominal dielectric characteristic of the circuit breaker.
  • the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure variation of the insulation gas is recorded in the synchronization device beforehand in the form of data representative for example of a polynomial function.
  • the pressure of the insulating gas in the circuit breaker is measured just before the switching of the circuit breaker and this measurement of the pressure of the insulating gas is used in conjunction with the pre-recorded data to determine the curve C representative of the dielectric strength of the circuit breaker for the pressure measured insulation gas.
  • the target instant tcc is then calculated from curve C. It is on this calculated target instant tcc that the compensated maneuver time tmc will be applied. As can be seen in FIG.
  • the target instant of switching is brought closer to the optimum target instant tc2 and therefore to the instant when the level of the voltage wave is zero. If the calculated target instant tcc is confused with the optimum target instant tc2, the circuit breaker is switched on the basis of the example in FIG. 2, at a time when the voltage is between 0.02 and 0, 16 of the nominal voltage and in practice close to 0.02 of the nominal voltage.
  • the gas-insulated circuit breaker includes a hydraulic control
  • data representative of the evolution of the dielectric characteristic C of the circuit breaker as a function of the temperature is recorded in the synchronization device.
  • hydraulic pressure of the hydraulic control Just before switching of the circuit breaker, the synchronization device performs a measurement of the hydraulic pressure and uses this pressure measurement together with the prerecorded data to determine the curve C and calculate the optimized target instant tcc. It is understood that the pressure measurements of the insulating gas and of the hydraulic fluid can be combined to calculate the target time tcc.
  • the invention also extends to a method of synchronizing a gas-insulated circuit breaker with a hydraulic control in which the target instant is calculated only from the measurement of the hydraulic pressure as indicated above.
  • the pressure of the insulating gas and the hydraulic fluid can be measured using conventional sensors usually present on circuit breakers isolated with a dielectric gas such as SF6 so that the implementation of the method according to the invention does not introduce no additional cost.

Abstract

A method of synchronizing drive to a gas-insulated circuit breaker with the voltage waveform applied to the terminals of the circuit breaker so as to cause the circuit breaker to switch at a computed target instant that is as close as possible to an instant corresponding to a certain amplitude level in the voltage waveform, wherein the pressure of the insulating gas inside the circuit breaker is measured immediately before said switching, and wherein said measurement is used together with prerecorded data representative of variation in the dielectric characteristic of the circuit breaker as a function of the pressure of said insulating gas in order to optimize computation of said target instant.

Description

L'invention porte sur un procédé de synchronisation de la manoeuvre d'un disjoncteur à isolation au gaz avec l'onde de tension aux bornes du disjoncteur pour obtenir une commutation du disjoncteur à un instant cible le plus proche possible d'un instant prédéterminé correspondant à un certain niveau d'amplitude de l'onde de tension.The invention relates to a method of synchronizing the operation of a gas-insulated circuit breaker with the voltage wave across the circuit breaker to obtain switching of the circuit breaker at a target instant as close as possible to a corresponding predetermined instant. at a certain level of amplitude of the voltage wave.

Une telle synchronisation permet par exemple de fermer le disjoncteur au moment où le niveau de l'onde de tension aux bornes du disjoncteur est proche de zéro.Such synchronization allows for example to close the circuit breaker when the level of the voltage wave across the circuit breaker is close to zero.

Jusqu'à présent la synchronisation de la manoeuvre d'un disjoncteur à isolation au gaz est réalisée à partir d'une compensation du temps de manoeuvre du disjoncteur en fonction de la température ambiante, la tension d'alimentation des auxiliaires de la commande du disjoncteur, etc.... relevées juste avant la manoeuvre et la commutation du disjoncteur. Tous ces paramètres de mesure influent en effet sur la durée du temps de manoeuvre du ou des contacts mobiles du disjoncteur et doivent être pris en considération pour ajuster l'instant à partir duquel la manoeuvre doit être engagée de façon à obtenir une commutation du disjoncteur au plus près de l'instant prédéterminé. Il est entendu que la synchronisation nécessite de surveiller l'évolution de l'onde de tension pour engager la manoeuvre du disjoncteur au moment opportun compte tenu du temps de manoeuvre compensé calculé et de l'instant cible de la commutation.Up to now, the synchronization of the operation of a gas-insulated circuit breaker has been achieved by compensating for the operating time of the circuit breaker as a function of the ambient temperature, the supply voltage of the auxiliaries of the circuit breaker control , etc .... noted just before the operation and switching of the circuit breaker. All these measurement parameters indeed affect the duration of the operating time of the circuit-breaker movable contact (s) and must be taken into account to adjust the instant from which the operation must be engaged in order to obtain switching of the circuit-breaker at closer to the predetermined time. It is understood that synchronization requires monitoring the evolution of the voltage wave in order to initiate the operation of the circuit breaker at the appropriate time taking into account the calculated compensated operating time and the target instant of switching.

Sur la figure 1, on a illustré sur un graphe l'évolution dans le temps de l'onde de tension alternative TR aux bornes du disjoncteur et pour une phase du disjoncteur. Sur ce graphe, t0 indique l'instant où un ordre de commutation est envoyé à la commande du disjoncteur, t1 indique l'instant à partir duquel la manoeuvre du disjoncteur est engagée par la commande et tc indique l'instant de la commutation du disjoncteur. Sur cette figure, l'instant tc correspond à un instant où la tension est nulle. Les instants t1 et tc sont séparés d'un intervalle de temps te correspondant au temps de manoeuvre compensé tmc calculé par le dispositif de synchronisation à partir de relevés de la température ambiante, de la tension d'alimentation des auxiliaires de la commande, etc... Les instants t0 et t1 sont séparés d'un intervalle de temps td correspondant à une temporisation de l'engagement de la manoeuvre pour assurer une synchronisation de la commutation au zéro de tension suite à l'ordre de commutation.In FIG. 1, a graph has been illustrated over time of the alternating voltage wave TR at the terminals of the circuit breaker and for one phase of the circuit breaker. In this graph, t0 indicates the instant when a switching order is sent to the circuit breaker control, t1 indicates the instant from which the operation of the circuit breaker is engaged by the command and tc indicates the instant of circuit breaker switching . In this figure, the instant tc corresponds to an instant when the voltage is zero. Instants t1 and tc are separated by a time interval te corresponding to the compensated operating time tmc calculated by the synchronization device from readings of the ambient temperature, the supply voltage of the control auxiliaries, etc. .. The instants t0 and t1 are separated by a time interval td corresponding to a time delay for engaging the operation to ensure synchronization of the switching at zero voltage following the switching order.

Sur la figure 2, on a encore illustré sur un graphe par la courbe TR l'évolution dans le temps de la tension alternative en valeur absolue aux bornes du disjoncteur. Sur le graphe, on a également reporté une courbe C1 représentant l'évolution de la tenue diélectrique du disjoncteur en phase de fermeture quand la densité du gaz d'isolation dans le disjoncteur est à sa valeur critique la plus faible et une courbe C2 représentant l'évolution de la tenue diélectrique du disjoncteur en phase de fermeture quand la densité du gaz d'isolation dans le disjoncteur est à une valeur nominale qui est au-dessus de la valeur critique. Les courbes C1 et C2 sont les deux courbes caractéristiques de tenue diélectrique du disjoncteur (ou de pré-amorçage de l'arc électrique entre les deux contacts du disjoncteur) et expriment que la tenue diélectrique du disjoncteur décroît au fur et à mesure que les contacts du disjoncteur se rapprochent l'un de l'autre jusqu'à la fermeture complète du disjoncteur. En pratique, pour effectuer une synchronisation de la manoeuvre d'un disjoncteur, l'instant cible tc de commutation est calculé en tenant compte de la courbe C1 et il en résulte que cet instant cible est décalé du zéro de tension et que la commutation du disjoncteur interviendra à un moment où la tension aux bornes du disjoncteur n'est pas nulle. Dans l'exemple des courbes C1 et C2 de la figure 2, on voit que la commutation intervient à un moment où la tension est comprise entre 0,16 et 0,19 de la tension nominale et en pratique proche de 0,19 de la tension nominale.In FIG. 2, the trend over time of the alternating voltage in absolute value at the terminals of the circuit breaker has also been illustrated on a graph by the curve TR. On the graph, we have also plotted a curve C1 representing the evolution of the dielectric strength of the circuit breaker in the closing phase when the density of the insulating gas in the circuit breaker is at its lowest critical value and a curve C2 representing the evolution of the dielectric strength of the circuit breaker in the closing when the density of the insulating gas in the circuit breaker is at a nominal value which is above the critical value. The curves C1 and C2 are the two characteristic curves of the dielectric strength of the circuit breaker (or of pre-striking of the electric arc between the two contacts of the circuit breaker) and express that the dielectric strength of the circuit breaker decreases as the contacts of the circuit breaker move towards each other until the circuit breaker is completely closed. In practice, to synchronize the operation of a circuit breaker, the target switching time tc is calculated by taking account of the curve C1 and it follows that this target time is offset from the voltage zero and that the switching of the circuit breaker will intervene at a time when the voltage across the circuit breaker is not zero. In the example of curves C1 and C2 in FIG. 2, it can be seen that the switching takes place at a time when the voltage is between 0.16 and 0.19 of the nominal voltage and in practice close to 0.19 of the nominal voltage.

Le but de l'invention est de proposer un procédé de synchronisation amélioré qui permet d'obtenir une commutation au plus prés du zéro de tension (ou d'un autre niveau choisi de l'onde de tension). Plus particulièrement, le but de l'invention est d'optimiser le calcul de l'instant cible.The object of the invention is to propose an improved synchronization method which makes it possible to obtain switching as close as possible to zero voltage (or to another chosen level of the voltage wave). More particularly, the object of the invention is to optimize the calculation of the target instant.

A cet effet, l'invention a pour objet un procédé de synchronisation de la manoeuvre d'un disjoncteur à isolation au gaz avec l'onde de tension appliquée aux bornes du disjoncteur pour obtenir une commutation du disjoncteur à un instant cible calculé le plus proche possible d'un instant correspondant à un certain niveau d'amplitude de l'onde de tension, caractérisé en ce qu'une mesure de la pression du gaz d'isolation dans le disjoncteur est effectuée juste avant ladite commutation, et en ce que ladite mesure est utilisée conjointement avec des données préenregistrées représentatives de l'évolution de la caractéristique diélectrique du disjoncteur en fonction de la pression dudit gaz d'isolation afin d'optimiser le calcul dudit instant cible.To this end, the subject of the invention is a method of synchronizing the operation of a gas-insulated circuit breaker with the voltage wave applied to the terminals of the circuit breaker to obtain switching of the circuit breaker at a closest calculated target instant. possible from an instant corresponding to a certain level of amplitude of the voltage wave, characterized in that a measurement of the pressure of the insulating gas in the circuit breaker is carried out just before said switching, and in that said measurement is used in conjunction with prerecorded data representative of the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure of said insulating gas in order to optimize the calculation of said target instant.

Comme exposé plus haut, la caractéristique diélectrique du disjoncteur varie en fonction de la pression du gaz d'isolation entre deux valeurs extrêmes, C1 correspondant à la valeur de la pression critique (valeur minimum) et C2 correspondant à la valeur de pression nominale. Entre ces deux valeurs extrêmes, la caractéristique diélectrique C du disjoncteur varie en fonction de la pression du gaz d'isolation. La figure 2 montrait que dans l'art antérieur, le temps cible optimum était calculé en fonction de la valeur C1. Mais si la pression du gaz d'isolation dans le disjoncteur est mesurée juste avant la manoeuvre pour la commutation du disjoncteur, il est possible de calculer un instant cible plus proche du zéro de tension que l'instant cible donné par la courbe C1. De manière générale, on sait représenter de façon approximée l'évolution de la caractéristique diélectrique d'un disjoncteur en fonction de la variation de la pression du gaz d'isolation dans le disjoncteur par une fonction polynomiale ou autre et enregistrer cette fonction sous la forme de données pour déterminer la courbe C représentative de la tenue diélectrique du disjoncteur pour un certain niveau de pression du gaz d'isolation. A partir de cette courbe C, on sait également déterminer par calcul l'instant cible correspondant. De cette façon on obtient une amélioration de la précision de la synchronisation.As explained above, the dielectric characteristic of the circuit breaker varies as a function of the pressure of the insulating gas between two extreme values, C1 corresponding to the value of the critical pressure (minimum value) and C2 corresponding to the value of nominal pressure. Between these two values extremes, the dielectric characteristic C of the circuit breaker varies as a function of the pressure of the insulating gas. FIG. 2 shows that in the prior art, the optimum target time was calculated as a function of the value C1. But if the pressure of the insulating gas in the circuit breaker is measured just before the operation for switching the circuit breaker, it is possible to calculate a target instant closer to zero voltage than the target instant given by the curve C1. In general, it is known to represent roughly the evolution of the dielectric characteristic of a circuit breaker as a function of the variation of the pressure of the insulating gas in the circuit breaker by a polynomial or other function and to record this function as data to determine the curve C representative of the dielectric strength of the circuit breaker for a certain level of pressure of the insulating gas. From this curve C, we also know how to calculate the corresponding target instant by calculation. In this way an improvement in the precision of synchronization is obtained.

Selon une mise en oeuvre particulière du procédé selon l'invention, dans lequel le disjoncteur à isolation au gaz est manoeuvré par une commande hydraulique, une mesure de la pression hydraulique est effectuée juste avant la commutation du disjoncteur, et ladite mesure de la pression hydraulique est utilisée conjointement avec des données préenregistrées représentatives de l'évolution de la caractéristique diélectrique du disjoncteur en fonction de la pression du liquide hydraulique afin d'optimiser le calcul dudit instant cible. La représentation de l'évolution de la caractéristique diélectrique d'un disjoncteur en fonction de la variation de la pression du liquide hydraulique est analogue à celle correspondant à la variation de la pression du gaz d'isolation à la différence près qu'elle est également proportionnelle à la vitesse de déplacement des contacts qui dépend elle-même de la pression du liquide hydraulique de la commande hydraulique.According to a particular implementation of the method according to the invention, in which the gas-insulated circuit breaker is operated by a hydraulic control, a measurement of the hydraulic pressure is carried out just before the switching of the circuit breaker, and said measurement of the hydraulic pressure is used in conjunction with prerecorded data representative of the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure of the hydraulic fluid in order to optimize the calculation of said target instant. The representation of the evolution of the dielectric characteristic of a circuit breaker as a function of the variation of the pressure of the hydraulic fluid is similar to that corresponding to the variation of the pressure of the insulating gas with the difference that it is also proportional to the speed of movement of the contacts, which itself depends on the pressure of the hydraulic fluid in the hydraulic control.

Le procédé selon l'invention est décrit ci-après et illustré par les dessins.The method according to the invention is described below and illustrated by the drawings.

La figure 1 est un graphe illustrant la synchronisation de la commutation d'un disjoncteur avec l'onde de tension aux bornes du disjoncteur.FIG. 1 is a graph illustrating the synchronization of the switching of a circuit breaker with the voltage wave across the terminals of the circuit breaker.

La figure 2 est un graphe illustrant les limites d'une synchronisation de la commutation du disjoncteur par compensation du temps de manoeuvre du disjoncteur.FIG. 2 is a graph illustrating the limits of a synchronization of the switching of the circuit breaker by compensation for the operating time of the circuit breaker.

La figure 3 est un graphe illustrant la prise en compte de la pression du gaz d'isolation dans la synchronisation de la manoeuvre du disjoncteur.FIG. 3 is a graph illustrating the taking into account of the pressure of the insulation gas in the synchronization of the operation of the circuit breaker.

La figure 2 montre que dans l'art antérieur, l'instant cible tc est calculé en fonction de la courbe C1. En se référant à la figure 3, l'onde de tension en valeur absolue pour une phase aux bornes d'un disjoncteur est représentée par la courbe TR. La courbe C1 présentée plus haut en relation avec la figure 2 définit un premier instant cible tc1 de la commutation qui est relativement éloigné de l'instant où le niveau de l'onde de tension est nul. La courbe C2 présentée également plus haut en relation avec la figure 2 définit l'instant cible optimum tc2 de la commutation qui est le plus proche de l'instant où le niveau de l'onde de tension est nul. Cet instant cible tc2 optimum correspond à la caractéristique diélectrique nominale du disjoncteur. Selon l'invention, on enregistre préalablement dans le dispositif de synchronisation l'évolution de la caractéristique diélectrique du disjoncteur en fonction de la variation de pression du gaz d'isolation sous la forme de données représentatives par exemple d'une fonction polynomiale. On mesure la pression du gaz d'isolation dans le disjoncteur juste avant la commutation du disjoncteur et cette mesure de pression du gaz d'isolation est utilisée conjointement avec les données préenregistrées pour déterminer la courbe C représentative de la tenue diélectrique du disjoncteur pour la pression mesurée du gaz d'isolation. L'instant cible tcc est calculé ensuite à partir de la courbe C. C'est sur cet instant cible calculé tcc que sera appliqué le temps de manoeuvre compensé tmc. Comme visible sur la figure 3, avec le procédé selon l'invention, on rapproche l'instant cible de la commutation de l'instant cible optimum tc2 et donc de l'instant où le niveau de l'onde de tension est nul. Si l'instant cible calculé tcc est confondu avec l'instant cible optimum tc2, on obtient une commutation du disjoncteur sur la base de l'exemple de la figure 2, à un moment où la tension est comprise entre 0,02 et 0,16 de la tension nominale et en pratique proche de 0,02 de la tension nominale.FIG. 2 shows that in the prior art, the target instant tc is calculated as a function of the curve C1. Referring to FIG. 3, the voltage wave in absolute value for a phase at the terminals of a circuit breaker is represented by the curve TR. The curve C1 presented above in relation to FIG. 2 defines a first target instant tc1 of the switching which is relatively distant from the instant when the level of the voltage wave is zero. The curve C2 also presented above in relation to FIG. 2 defines the optimum target instant tc2 of the switching which is closest to the instant when the level of the voltage wave is zero. This optimum instant tc2 corresponds to the nominal dielectric characteristic of the circuit breaker. According to the invention, the evolution of the dielectric characteristic of the circuit breaker as a function of the pressure variation of the insulation gas is recorded in the synchronization device beforehand in the form of data representative for example of a polynomial function. The pressure of the insulating gas in the circuit breaker is measured just before the switching of the circuit breaker and this measurement of the pressure of the insulating gas is used in conjunction with the pre-recorded data to determine the curve C representative of the dielectric strength of the circuit breaker for the pressure measured insulation gas. The target instant tcc is then calculated from curve C. It is on this calculated target instant tcc that the compensated maneuver time tmc will be applied. As can be seen in FIG. 3, with the method according to the invention, the target instant of switching is brought closer to the optimum target instant tc2 and therefore to the instant when the level of the voltage wave is zero. If the calculated target instant tcc is confused with the optimum target instant tc2, the circuit breaker is switched on the basis of the example in FIG. 2, at a time when the voltage is between 0.02 and 0, 16 of the nominal voltage and in practice close to 0.02 of the nominal voltage.

Pour optimiser encore plus le calcul de l'instant cible tcc si le disjoncteur à isolation au gaz comporte une commande hydraulique, on enregistre préalablement dans le dispositif de synchronisation des données représentatives de l'évolution de la caractéristique diélectrique C du disjoncteur en fonction de la pression hydraulique de la commande hydraulique. Juste avant la commutation du disjoncteur, le dispositif de synchronisation effectue une mesure de la pression hydraulique et utilise cette mesure de pression conjointement avec les données préenregistrées pour déterminer la courbe C et calculer l'instant cible optimisé tcc. Il est entendu que les mesures de pression du gaz d'isolation et du liquide hydraulique peuvent être combinées pour calculer l'instant cible tcc. L'invention s'étend aussi à un procédé de synchronisation d'un disjoncteur à isolation au gaz avec une commande hydraulique dans lequel l'instant cible est calculé seulement à partir de la mesure de la pression hydraulique comme indiqué plus haut.To further optimize the calculation of the target instant tcc if the gas-insulated circuit breaker includes a hydraulic control, data representative of the evolution of the dielectric characteristic C of the circuit breaker as a function of the temperature is recorded in the synchronization device. hydraulic pressure of the hydraulic control. Just before switching of the circuit breaker, the synchronization device performs a measurement of the hydraulic pressure and uses this pressure measurement together with the prerecorded data to determine the curve C and calculate the optimized target instant tcc. It is understood that the pressure measurements of the insulating gas and of the hydraulic fluid can be combined to calculate the target time tcc. The invention also extends to a method of synchronizing a gas-insulated circuit breaker with a hydraulic control in which the target instant is calculated only from the measurement of the hydraulic pressure as indicated above.

La pression du gaz d'isolation et du liquide hydraulique peut être mesurée à l'aide de capteurs conventionnels habituellement présents sur des disjoncteurs isolés avec un gaz diélectrique comme du SF6 de sorte que la mise en oeuvre du procédé selon l'invention n'introduit pas de coût supplémentaire.The pressure of the insulating gas and the hydraulic fluid can be measured using conventional sensors usually present on circuit breakers isolated with a dielectric gas such as SF6 so that the implementation of the method according to the invention does not introduce no additional cost.

Claims (4)

Un procédé de synchronisation de la manoeuvre d'un disjoncteur à isolation au gaz avec l'onde de tension (TR) appliquée aux bornes du disjoncteur pour obtenir une commutation du disjoncteur à un instant cible calculé le plus proche possible d'un instant correspondant à un certain niveau d'amplitude de l'onde de tension, caractérisé en ce qu'une mesure de la pression du gaz d'isolation dans le disjoncteur est effectuée juste avant ladite commutation, et en ce que ladite mesure est utilisée conjointement avec des données préenregistrées représentatives de l'évolution de la caractéristique diélectrique (C) du disjoncteur en fonction de la pression dudit gaz d'isolation afin d'optimiser le calcul dudit instant cible (tcc).A method of synchronizing the operation of a gas-insulated circuit breaker with the voltage wave (TR) applied across the circuit breaker to obtain switching of the circuit breaker at a calculated target instant as close as possible to an instant corresponding to a certain level of amplitude of the voltage wave, characterized in that a measurement of the pressure of the insulating gas in the circuit breaker is carried out just before said switching, and in that said measurement is used in conjunction with data prerecorded representative of the evolution of the dielectric characteristic (C) of the circuit breaker as a function of the pressure of said insulating gas in order to optimize the calculation of said target instant (tcc). Le procédé selon la revendication 1, dans lequel le disjoncteur à isolation au gaz est manoeuvré par une commande hydraulique, dans lequel une mesure de la pression hydraulique est effectuée juste avant ladite commutation, et dans lequel ladite mesure de la pression hydraulique est utilisée conjointement avec des données préenregistrées représentatives de l'évolution de la caractéristique diélectrique (C) du disjoncteur en fonction de la pression du liquide hydraulique afin d'optimiser le calcul dudit instant cible (tcc).The method of claim 1, wherein the gas insulated circuit breaker is operated by hydraulic control, wherein a measurement of the hydraulic pressure is made just prior to said switching, and wherein said measurement of the hydraulic pressure is used in conjunction with pre-recorded data representative of the evolution of the dielectric characteristic (C) of the circuit breaker as a function of the pressure of the hydraulic liquid in order to optimize the calculation of said target instant (tcc). Un procédé de synchronisation de la manoeuvre d'un disjoncteur à isolation au gaz et à commande hydraulique avec l'onde de tension (TR) appliquée aux bornes du disjoncteur pour obtenir une commutation du disjoncteur à un instant cible calculé le plus proche possible d'un instant correspondant à un certain niveau d'amplitude de l'onde de tension, caractérisé en ce qu'une mesure de la pression du liquide hydraulique de la commande est effectuée juste avant ladite commutation, et en ce que ladite mesure de la pression hydraulique est utilisée conjointement avec des données préenregistrées représentatives de l'évolution de la caractéristique diélectrique (C) du disjoncteur en fonction de la pression du liquide hydraulique de la commande afin d'optimiser le calcul dudit instant cible (tcc).A method of synchronizing the operation of a gas-insulated and hydraulically controlled circuit breaker with the voltage wave (TR) applied across the circuit breaker to obtain circuit breaker switching at a calculated target instant as close as possible to an instant corresponding to a certain level of amplitude of the tension wave, characterized in that a measurement of the pressure of the hydraulic fluid of the control is carried out just before said switching, and in that said measurement of the hydraulic pressure is used in conjunction with pre-recorded data representative of the evolution of the dielectric characteristic (C) of the circuit breaker as a function of the pressure of the hydraulic fluid of the control in order to optimize the calculation of said target instant (tcc). Le procédé selon l'une des revendications 1 à 3, dans lequel ledit niveau d'amplitude de l'onde de tension est choisi égal à zéro.The method according to one of claims 1 to 3, wherein said amplitude level of the voltage wave is chosen to be zero.
EP01401460A 2000-06-19 2001-06-06 Method of syncronisation of switching operation of a circuit breaker with voltage waveform Revoked EP1168398B1 (en)

Applications Claiming Priority (2)

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FR0007783 2000-06-19
FR0007783A FR2810445B1 (en) 2000-06-19 2000-06-19 METHOD FOR SYNCHRONIZING THE SWITCHING OF A CIRCUIT BREAKER WITH THE VOLTAGE WAVE

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EP1168398B1 EP1168398B1 (en) 2006-11-22

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CN (1) CN1172341C (en)
AT (1) ATE346370T1 (en)
AU (1) AU772974B2 (en)
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CA2351111A1 (en) 2001-12-19
FR2810445A1 (en) 2001-12-21
US20020003380A1 (en) 2002-01-10
FR2810445B1 (en) 2002-07-26
AU772974B2 (en) 2004-05-13
ZA200104930B (en) 2002-02-05
ATE346370T1 (en) 2006-12-15
US6646361B2 (en) 2003-11-11
CA2351111C (en) 2008-09-23
AU5195101A (en) 2001-12-20
BR0102751A (en) 2002-02-19
EP1168398B1 (en) 2006-11-22
CN1172341C (en) 2004-10-20
CN1330379A (en) 2002-01-09
DE60124624T2 (en) 2007-05-16
DE60124624D1 (en) 2007-01-04

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