EP0831505A1 - Circuit breaker with variable damping resistance - Google Patents

Circuit breaker with variable damping resistance Download PDF

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Publication number
EP0831505A1
EP0831505A1 EP97402135A EP97402135A EP0831505A1 EP 0831505 A1 EP0831505 A1 EP 0831505A1 EP 97402135 A EP97402135 A EP 97402135A EP 97402135 A EP97402135 A EP 97402135A EP 0831505 A1 EP0831505 A1 EP 0831505A1
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EP
European Patent Office
Prior art keywords
circuit breaker
electrodes
breaker according
rods
resistance
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP97402135A
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German (de)
French (fr)
Inventor
Van Doan Pham
Joseph Martin
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Grid Solutions SAS
Original Assignee
GEC Alsthom T&D SA
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Publication of EP0831505A1 publication Critical patent/EP0831505A1/en
Withdrawn legal-status Critical Current

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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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16—Impedances connected with contacts
    • H01H33/165—Details concerning the impedances

Definitions

  • the present invention relates to a circuit breaker generator with variable damping resistance.
  • the first object of the invention is to propose a resistance increasing its initial value rapidly, passing, for example, from a few ohms to a few tens of ohms in 50 milliseconds in order to satisfy the two conditions simultaneously.
  • a second object of the invention is to reduce the volume and the weight of the resistor.
  • the self-regulating resistors polymer used in industry especially to heat water pipes to prevent freezing during winter.
  • the resistor formed from a carbon black charged polymer having a low ohmic value lets a larger current flow, for example under a permanent voltage of 220V for an absorbed power of 30 to 40 W / m.
  • the resistivity increases and the power consumed becomes much lower, ie less than 5 W / m.
  • the solution proposed by the invention consists in using a variable resistor, consisting of polymer elements in a generator circuit breaker.
  • a variable resistor consisting of polymer elements in a generator circuit breaker.
  • the heating of the elements when they are traversed by a high current will lead to an abrupt rise in their resistivity from a certain temperature threshold, 120 ° C for example.
  • the present invention presents a particular architecture for variable resistance. Said resistance is in the form of a rod made up of several resistive elements in series, separated by empty spaces.
  • the assembly is covered with an insulating sheath and comprises flat electrodes, made of copper, mutually parallel and having edges curved outwards.
  • the rod 1 is formed of elements of variable resistance 2 of length L in series and presented in the form of a parallelepiped.
  • the basic resistance element 2 consists of a resistance matrix 3 made of a polymer charged with carbon black and provided with two electrodes, 4 and 5, flat, parallel, curved on the two longitudinal edges, of tinned copper and spaced apart. 'from each other by d mm.
  • the purpose of the curvatures on the longitudinal edges is to avoid arcing at the corners.
  • Resistor 2 advantageously has a resistivity of the order of a hundred ohms per centimeter, for example between 100 ⁇ .cm and 300 ⁇ .cm.
  • the basic element 2 is protected from the outside by a rigid cross-linked insulating sheath 6 which covers the other elements in series and the free spaces 9 at the same time.
  • the purpose of these free spaces is to prevent ignition under the effect of the potential difference between two successive polymer elements.
  • the length 1 of these free spaces is 10 mm.
  • a small hole 10 drilled in the protective casing 6 at the free spaces 9 allows the heated air to flow into these free spaces.
  • the electrodes 4 and 5 have lengths equal to 2L + 1 and are staggered within the rods 1.
  • FIG. 3 which schematically shows the overall arrangement of the generator circuit breaker
  • the compartment 11 represents the main breaking chamber
  • the compartment 12 the auxiliary breaking chamber used for breaking the residual current passing through the resistor 1 and for the '' isolate from the circuit.
  • the auxiliary chamber 12 and the variable resistance rods 1 are in parallel with the main chamber 11.
  • Several rods of variable resistance can be mounted in parallel with each other via the collectors 13 and 14.
  • the connections 7 and 8 of the variable resistor are connected to the collectors 13 and 14 of the generator circuit breaker.
  • FIG. 4 shows the arrangement of the resistance rods 1, in part, around the main chamber 11, in order to obtain an initial resistance of low value by placing said resistance rods 1 in parallel using the collectors 13 and 14. This provision is of course not limiting.
  • FIG. 5 indicates an alternative embodiment of the rods in which the electrodes 4 and 5 have been replaced by cylindrical copper conductors arranged one above the other.
  • the envelope 6 and the matrix 3 are also of cylindrical shape.
  • the electrodes 4 and 5 have a diameter of the order of 4 mm, for a length L of the matrix 3 and a spacing 1 between the electrodes identical to those of the first embodiment.
  • the equivalent volume is also 7000 cm 3 for a final resistance of 50 ohms.

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  • Thermistors And Varistors (AREA)

Abstract

The circuit breaker presents two chambers (11,12) and collectors (13,14) which are connected to a variable resistor (1). The resistor has a tubular shape and is made up of a number of elementary resistors (2). Each elementary resistor has a polymer matrix with carbon fragments in suspension and two parallel electrodes (4,5). The electrodes are flat and made of copper. The whole resistor is covered by a protection envelope (6) with ventilation openings (10).

Description

La présente invention concerne un disjoncteur de générateur avec résistance d'amortissement variable.The present invention relates to a circuit breaker generator with variable damping resistance.

Dans le domaine de l'appareillage et, notamment, pour les disjoncteurs de générateur protégeant les alternateurs de grande puissance, il est nécessaire d'équiper ces disjoncteurs de résistances de faible valeur ohmique, ou résistances d'amortissement, afin de réduire fortement la vitesse d'accroissement de la tension transitoire de rétablissement lors de la coupure.
   Les résistances utilisées jusqu'à maintenant sont souvent des résistances céramiques à base de carbone ou graphite de valeur constante, se présentant sous la forme de disques.
   Pour diminuer fortement le courant résiduel à couper par un disjoncteur auxiliaire, il est nécessaire d'avoir une résistance de forte valeur.In the field of switchgear and, in particular, for generator circuit breakers protecting high power alternators, it is necessary to equip these circuit breakers with resistors of low ohmic value, or damping resistors, in order to greatly reduce the speed increase in the transient recovery voltage upon switching off.
The resistors used until now are often ceramic resistors based on carbon or graphite of constant value, being in the form of discs.
To greatly reduce the residual current to be cut by an auxiliary circuit breaker, it is necessary to have a high-value resistor.

Le premier but de l'invention est de proposer une résistance augmentant sa valeur initiale rapidement, passant, par exemple, de quelques ohms à quelques dizaines d'ohms en 50 millisecondes afin de satisfaire aux deux conditions simultanément.
   Un second but de l'invention est de réduire le volume et le poids de la résistance.The first object of the invention is to propose a resistance increasing its initial value rapidly, passing, for example, from a few ohms to a few tens of ohms in 50 milliseconds in order to satisfy the two conditions simultaneously.
A second object of the invention is to reduce the volume and the weight of the resistor.

On connaít par ailleurs les résistances autorégulantes à polymère, utilisées dans l'industrie notamment pour chauffer les conduits d'eau afin d'éviter le gel pendant l'hiver.
   En effet à température basse, la résistance formée de polymère chargé de noir de carbone ayant une valeur ohmique faible laisse passer un courant plus grand, par exemple sous une tension permanente de 220V pour une puissance absorbée de 30 à 40 W/m.
   A température plus élevée (en été par exemple), la résistivité augmente et la puissance consommée devient beaucoup plus faible, i.e. inférieure à 5 W/m.
   Pour obtenir plus de renseignements sur le principe des résistances autorégulantes à polymère, on pourra se reporter à l'article de F. Legros, A. Brault et G. Lorguilloux, « Câbles autorégulants : principe et utilisation industrielle » (Société Acome, RGE n°11, décembre 1989).We also know the self-regulating resistors polymer, used in industry especially to heat water pipes to prevent freezing during winter.
In fact, at low temperature, the resistor formed from a carbon black charged polymer having a low ohmic value lets a larger current flow, for example under a permanent voltage of 220V for an absorbed power of 30 to 40 W / m.
At higher temperature (in summer for example), the resistivity increases and the power consumed becomes much lower, ie less than 5 W / m.
For more information on the principle of self-regulating polymer resistances, reference may be made to the article by F. Legros, A. Brault and G. Lorguilloux, “Self-regulating cables: principle and industrial use” (Société Acome, RGE n ° 11, December 1989).

La solution proposée par l'invention consiste à utiliser une résistance variable, constituée d'éléments en polymère dans un disjoncteur de générateur. Ainsi, l'échauffement des éléments lorsqu'ils sont traversés par un courant élevé, conduira à une élévation brusque de leur résistivité à partir d'un certain seuil de température, 120°C par exemple.
   La présente invention présente une architecture particulière pour la résistance variable. Ladite résistance se présente sous la forme d'un bâtonnet constitué de plusieurs éléments résistifs en série, séparés par des espaces vides. L'ensemble est recouvert d'une gaine isolante et comporte des électrodes plates, en cuivre, parallèles entre elles et possédant des bords recourbés vers l'extérieur.The solution proposed by the invention consists in using a variable resistor, consisting of polymer elements in a generator circuit breaker. Thus, the heating of the elements when they are traversed by a high current, will lead to an abrupt rise in their resistivity from a certain temperature threshold, 120 ° C for example.
The present invention presents a particular architecture for variable resistance. Said resistance is in the form of a rod made up of several resistive elements in series, separated by empty spaces. The assembly is covered with an insulating sheath and comprises flat electrodes, made of copper, mutually parallel and having edges curved outwards.

D'autres avantages et caractéristiques de la présente invention résulteront de la description qui va suivre en référence aux dessins annexés dans lesquels :

  • La figure 1 représente une coupe longitudinale selon l'axe I-I de la figure 2 d'un bâtonnet de résistance variable en polymère selon l'invention.
  • La figure 2 montre une vue en section du même bâtonnet.
  • La figure 3 montre schématiquement la disposition d'ensemble du disjoncteur de générateur mettant en oeuvre des bâtonnets de résistance variable.
  • La figure 4 montre un agencement physique des résistances variables autour de la chambre de coupure du disjoncteur.
  • La figure 5 montre une variante de réalisation des bâtonnets de résistance variable.
    • Other advantages and characteristics of the present invention will result from the description which follows with reference to the appended drawings in which:
  • FIG. 1 represents a longitudinal section along the axis II of FIG. 2 of a variable resistance rod made of polymer according to the invention.
  • Figure 2 shows a sectional view of the same stick.
  • Figure 3 schematically shows the overall arrangement of the generator circuit breaker using variable resistance rods.
  • FIG. 4 shows a physical arrangement of the variable resistances around the breaking chamber of the circuit breaker.
  • Figure 5 shows an alternative embodiment of the sticks of variable resistance.

    • Dans la figure 1, le bâtonnet 1 est formé d'éléments de résistance variable 2 de longueur L en série et présentés sous forme parallélépipèdique.
       L'élément de base de résistance 2 constitué d'une matrice de résistance 3 en polymère chargé de noir de carbone et muni de deux électrodes, 4 et 5, plates, parallèle, recourbées sur les deux bords longitudinaux, en cuivre étamé et écartées l'une de l'autre de d mm.
       Les courbures sur les bords longitudinaux ont pour but d'éviter des amorçages au niveau des angles.
       La résistance 2 a avantageusement une résistivité de l'ordre d'une centaine d'ohms par centimètres, par exemple entre 100 Ω.cm et 300 Ω.cm.
       L'élément de base 2 est protégé de l'extérieur par une gaine rigide isolante 6 réticulée qui couvre en même temps les autres éléments en série et les espaces libres 9.
       L'objet de ces espaces libres est d'empêcher un amorçage sous l'effet de la différence de potentiel entre deux éléments en polymère successifs.
       Préférentiellement, la longueur 1 de ces espaces libres est de 10 mm.
       Un petit trou 10 percé dans l'enveloppe de protection 6 au niveau des espaces libres 9 permet d'écouler l'air chauffé dans ces espaces libres.
       Les électrodes 4 et 5 ont des longueurs valant 2L+1 et sont disposées en quinconce au sein des bâtonnets 1.     In FIG. 1, the rod 1 is formed of elements of variable resistance 2 of length L in series and presented in the form of a parallelepiped.
    The basic resistance element 2 consists of a resistance matrix 3 made of a polymer charged with carbon black and provided with two electrodes, 4 and 5, flat, parallel, curved on the two longitudinal edges, of tinned copper and spaced apart. 'from each other by d mm.
    The purpose of the curvatures on the longitudinal edges is to avoid arcing at the corners.
    Resistor 2 advantageously has a resistivity of the order of a hundred ohms per centimeter, for example between 100 Ω.cm and 300 Ω.cm.
    The basic element 2 is protected from the outside by a rigid cross-linked insulating sheath 6 which covers the other elements in series and the free spaces 9 at the same time.
    The purpose of these free spaces is to prevent ignition under the effect of the potential difference between two successive polymer elements.
    Preferably, the length 1 of these free spaces is 10 mm.
    A small hole 10 drilled in the protective casing 6 at the free spaces 9 allows the heated air to flow into these free spaces.
    The electrodes 4 and 5 have lengths equal to 2L + 1 and are staggered within the rods 1.

    Dans la figure 3 qui montre schématiquement la disposition d'ensemble du disjoncteur de générateur, le compartiment 11 représente la chambre de coupure principale, et le compartiment 12 la chambre de coupure auxiliaire utilisée pour la coupure du courant résiduel traversant la résistance 1 et pour l'isoler du circuit.
       La chambre auxiliaire 12 et les bâtonnets de résistance variable 1 sont en parallèle avec la chambre principale 11.
       Plusieurs bâtonnets de résistance variable peuvent être montés en parallèle les uns par rapport aux autres par l'intermédiaire des collecteurs 13 et 14.
       Les connexions 7 et 8 de la résistance variable sont reliées aux collecteurs 13 et 14 du disjoncteur de générateur.    In FIG. 3 which schematically shows the overall arrangement of the generator circuit breaker, the compartment 11 represents the main breaking chamber, and the compartment 12 the auxiliary breaking chamber used for breaking the residual current passing through the resistor 1 and for the '' isolate from the circuit.
    The auxiliary chamber 12 and the variable resistance rods 1 are in parallel with the main chamber 11.
    Several rods of variable resistance can be mounted in parallel with each other via the collectors 13 and 14.
    The connections 7 and 8 of the variable resistor are connected to the collectors 13 and 14 of the generator circuit breaker.

    La figure 4 montre la disposition des bâtonnets de résistances 1, en partie, autour de la chambre principale 11, afin d'obtenir une résistance initiale de valeur faible par la mise en parallèle desdits bâtonnets de résistances 1 à l'aide des collecteurs 13 et 14.
       Cette disposition n'est bien sûr pas limitative.    FIG. 4 shows the arrangement of the resistance rods 1, in part, around the main chamber 11, in order to obtain an initial resistance of low value by placing said resistance rods 1 in parallel using the collectors 13 and 14.
    This provision is of course not limiting.

    Le dispositif fonctionne comme suit :
       En fonctionnement normal, les chambres de coupure 11 et 12 sont fermées. Le courant traverse 11, celui passant par la chambre de coupure auxiliaire 12 et par la résistance 1 étant négligeable. L'élément 1 présente une résistance faible, par exemple 5 ohms à la température ambiante de 20°C.
       A l'ouverture de l'interrupteur contenu dans la chambre principale 11 et au passage à zéro du courant de court-circuit, l'arc s'éteindra dans la chambre 11 s'il y a coupure définitive.
       Pendant l'application de la tension transitoire de rétablissement aux bornes de la chambre de coupure principale 11, un courant résistif traverse la chambre de coupure auxiliaire 12 et les bâtonnets de résistance 1. Ce courant chauffe la matrice en polymère 3 contenue dans chacun des bâtonnets et fait augmenter fortement sa valeur ohmique à chaque alternance du courant résiduel.
       Environ 50 ms après l'ouverture de la chambre de coupure principale 11, l'interrupteur contenu dans la chambre de coupure auxiliaire 12 s'ouvre et coupe le courant résiduel qui, par rapport à sa valeur initiale, est réduit de l'ordre de 10 fois. L'interrupteur de la chambre 12 n'a donc plus qu'un faible courant résistif à couper.
       L'utilisation d'une résistance variable à polymère permet ainsi de pouvoir réduire fortement le pouvoir de coupure de l'interrupteur 11 et de diminuer aussi le volume et le poids de la résistance d'amortissement.
       La forme parallélépipèdique et de faible dimension des bâtonnets de résistance variable 1 facilite aussi sa mise en parallèle autour de la chambre de coupure principale 11.
       A titre d'exemple de réalisation, on pourra prendre pour un réseau de 17 kV avec une résistance initiale de 5 ohm les valeurs suivantes :

    • l'écartement d entre les deux électrodes est de 10 mm ;
    • la longueur h de chaque électrode est de 15 mm ;
    • la longueur 1 des espaces libres est de 10 mm ;
    • la longueur L d'une matrice de résistance est de 50 mm ;
    • chaque bâtonnet de résistance 1 est formée de 10 éléments 2 en série ;
    • 40 bâtonnets de résistance 1 sont placées en parallèle ;
    Le volume utile de la résistance est alors de 7000 cm3 environ pour une résistance finale de 50 ohms.The device works as follows:
    In normal operation, the interrupting chambers 11 and 12 are closed. The current flows through 11, that passing through the auxiliary breaking chamber 12 and through the resistor 1 being negligible. Element 1 has a low resistance, for example 5 ohms at an ambient temperature of 20 ° C.
    When the switch contained in the main chamber 11 is opened and the short-circuit current crosses to zero, the arc will extinguish in chamber 11 if there is a final cut.
    During the application of the transient recovery voltage across the terminals of the main breaking chamber 11, a resistive current flows through the auxiliary breaking chamber 12 and the resistance rods 1. This current heats the polymer matrix 3 contained in each of the rods and greatly increases its ohmic value at each alternation of the residual current.
    About 50 ms after the opening of the main breaking chamber 11, the switch contained in the auxiliary breaking chamber 12 opens and cuts the residual current which, compared to its initial value, is reduced by about 10 times. The switch of the chamber 12 therefore has only a small resistive current to cut.
    The use of a variable polymer resistance thus makes it possible to be able to greatly reduce the breaking capacity of the switch 11 and also to reduce the volume and the weight of the damping resistance.
    The small, parallelepiped shape of the rods of variable resistance 1 also makes it easier to parallel it around the main breaking chamber 11.
    As an example of an embodiment, the following values can be taken for a 17 kV network with an initial resistance of 5 ohms:
    • the spacing d between the two electrodes is 10 mm;
    • the length h of each electrode is 15 mm;
    • the length 1 of the free spaces is 10 mm;
    • the length L of a resistance matrix is 50 mm;
    • each resistance rod 1 is formed of 10 elements 2 in series;
    • 40 resistance rods 1 are placed in parallel;
    The useful volume of the resistor is then approximately 7000 cm 3 for a final resistance of 50 ohms.

    La figure 5 indique une variante de réalisation des bâtonnets dans laquelle on a remplacé les électrodes 4 et 5 par des conducteurs cylindriques en cuivre disposés l'un au dessus de l'autre. L'enveloppe 6 et la matrice 3 sont aussi de forme cylindrique. Les électrodes 4 et 5 ont un diamètre de l'ordre de 4 mm, pour une longueur L de la matrice 3 et un écartement 1 entre les électrodes identique à ceux du premier mode de réalisation. Le volume équivalent est aussi de 7000 cm3 pour une résistance finale de 50 ohms.FIG. 5 indicates an alternative embodiment of the rods in which the electrodes 4 and 5 have been replaced by cylindrical copper conductors arranged one above the other. The envelope 6 and the matrix 3 are also of cylindrical shape. The electrodes 4 and 5 have a diameter of the order of 4 mm, for a length L of the matrix 3 and a spacing 1 between the electrodes identical to those of the first embodiment. The equivalent volume is also 7000 cm 3 for a final resistance of 50 ohms.

    Bien que seuls deux modes de réalisation aient été décrits, il est clair que toute modification ou amélioration apportée à la présente invention et qui serait évidente pour l'homme du métier est comprise dans le cadre de l'invention.Although only two embodiments have been described, it is clear that any modification or improvement made to the present invention and which would be obvious to a person skilled in the art is included in the context of the invention.

    Claims (8)

    Disjoncteur de générateur mettant en oeuvre des résistances d'amortissement comportant des éléments en polymère chargé de noir de carbone caractérisé en ce que lesdites résistances sont agencées sous forme de bâtonnets (1) comportant plusieurs éléments de résistance (2) en série intercalés par des espaces libres (9), en ce que ledit bâtonnet est protégé par une enveloppe isolante de protection (6) et en ce que ledit bâtonnet est muni de deux électrodes (4 et 5) montées en quinconce.Generator circuit breaker using damping resistors comprising elements made of polymer charged with carbon black characterized in that said resistors are arranged in the form of rods (1) comprising several resistance elements (2) in series interspersed with spaces free (9), in that said rod is protected by an insulating protective envelope (6) and in that said rod is provided with two electrodes (4 and 5) mounted in staggered rows. Disjoncteur selon la revendication 1 caractérisé en ce que chacun des éléments de résistance (2) a une résistivité entre 100 Ω.cm et 300 Ω.cm.Circuit breaker according to claim 1 characterized in that each of the resistance elements (2) has a resistivity between 100 Ω.cm and 300 Ω.cm. Disjoncteur selon l'une des revendications 1 à 2 caractérisé en ce que les bâtonnets (1) ont une forme parallélépipèdique et en ce que les électrodes (4 et 5) sont plates, parallèles entre elles et possèdent des bords recourbés vers l'extérieur.Circuit breaker according to one of claims 1 to 2 characterized in that the rods (1) have a parallelepiped shape and in that the electrodes (4 and 5) are flat, parallel to each other and have edges curved outwards. Disjoncteur selon l'une des revendications 1 à 2 caractérisé en ce que les bâtonnets (1) et les électrodes (4 et 5) ont une forme cylindrique.Circuit breaker according to one of claims 1 to 2 characterized in that the rods (1) and the electrodes (4 and 5) have a cylindrical shape. Disjoncteur selon l'une des revendications 1 à 4 caractérisé en ce qu'un trou (10) est percé dans l'enveloppe (6) au niveau de chacun des espaces libres (9) pour permettre l'évacuation de la chaleur.Circuit breaker according to one of Claims 1 to 4, characterized in that a hole (10) is drilled in the casing (6) at each of the free spaces (9) to allow the heat to be removed. Disjoncteur selon l'une des revendication 1 à 5 caractérisé en ce que chacun des éléments de résistance (2) a une longueur (L) de 50 mm environ. Circuit breaker according to one of Claims 1 to 5, characterized in that each of the resistance elements (2) has a length (L) of approximately 50 mm. Disjoncteur selon l'une des revendications 1 à 6 caractérisé en ce que la longueur (1) de l'espace vide (9) est de 10 mm environ.Circuit breaker according to one of Claims 1 to 6, characterized in that the length (1) of the empty space (9) is approximately 10 mm. Disjoncteur selon l'une des revendications 1 à 7 caractérisé en ce que la distance (d) entre les deux électrodes (4 et 5) est de 10 mm environ.Circuit breaker according to one of Claims 1 to 7, characterized in that the distance (d) between the two electrodes (4 and 5) is approximately 10 mm.
    EP97402135A 1996-09-20 1997-09-15 Circuit breaker with variable damping resistance Withdrawn EP0831505A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9611493 1996-09-20
    FR9611493A FR2753833B1 (en) 1996-09-20 1996-09-20 GENERATOR CIRCUIT BREAKER WITH VARIABLE DAMPING RESISTANCE

    Publications (1)

    Publication Number Publication Date
    EP0831505A1 true EP0831505A1 (en) 1998-03-25

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    Application Number Title Priority Date Filing Date
    EP97402135A Withdrawn EP0831505A1 (en) 1996-09-20 1997-09-15 Circuit breaker with variable damping resistance

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    FR (1) FR2753833B1 (en)

    Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2347796A (en) * 1943-02-19 1944-05-02 Sprague Products Company Electrical resistor
    GB858117A (en) * 1956-07-06 1961-01-04 English Electric Co Ltd Improvements in and relating to electric resistors
    EP0152718A1 (en) * 1984-02-16 1985-08-28 Siemens Aktiengesellschaft Isolating switch for metal clad pressurized gas insulated high voltage switch gear
    FR2625626A1 (en) * 1987-12-30 1989-07-07 Alsthom BRAKING RESISTANCE FOR HIGH VOLTAGE ELECTRICAL NETWORK
    EP0508647A2 (en) * 1991-03-25 1992-10-14 Ngk Insulators, Ltd. Arrestor unit

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2347796A (en) * 1943-02-19 1944-05-02 Sprague Products Company Electrical resistor
    GB858117A (en) * 1956-07-06 1961-01-04 English Electric Co Ltd Improvements in and relating to electric resistors
    EP0152718A1 (en) * 1984-02-16 1985-08-28 Siemens Aktiengesellschaft Isolating switch for metal clad pressurized gas insulated high voltage switch gear
    FR2625626A1 (en) * 1987-12-30 1989-07-07 Alsthom BRAKING RESISTANCE FOR HIGH VOLTAGE ELECTRICAL NETWORK
    EP0508647A2 (en) * 1991-03-25 1992-10-14 Ngk Insulators, Ltd. Arrestor unit

    Also Published As

    Publication number Publication date
    FR2753833B1 (en) 1998-10-23
    FR2753833A1 (en) 1998-03-27

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