EP2965339B1 - System for driving a follower cap by means of a trigger for a high-voltage grounding device - Google Patents

Description

Field of the invention

The invention relates to electrical equipment for earthing in high voltage electrical installations.

Prior art and problem

Electrical installations, such as high-voltage substations, are composed of multiple electrical devices that have fundamental functions, but different from each other. All of these devices have the function of distributing energy on high-voltage electricity networks, while protecting these networks.

Electrical high-voltage interruption devices concern networks supplied with AC power at voltages greater than 1,000 Volts. Perfect control of electrical energy requires the necessary means to control and control the flow of current in the electrical circuits that connect power plants to consumers. Such a mission is fundamentally the responsibility of devices whose control is to ensure as a priority the automatic protection of circuits against all incidents likely to disrupt its operation. These devices must also perform, on command, the various operations that make it possible to modify the configuration of the network under normal conditions of service. With these additional functions of voluntary control and automatic safety, the electrical devices contribute to the quality of the availability of the electricity network and its safety of use. The main quality of these electrical devices is not only to be available at all times, but also to intervene without failure, to the point of forgetting that they exist. Maintenance operations, even light and limited in number are both expensive and inconvenient for the operation. As a result, these devices are required to have near perfect reliability.

Grounding disconnectors are safety devices intended to establish a connection, via a rigid conductive material, between the live parts attached to a little or unknown potential, and the earth.

As an indication, by the patent application EP 1 845 540 A2 or the patent application PCT WO 2012/049 136 A1 there is known a ground disconnecting device and a high voltage substation comprising such a device. Such a high-voltage station is gas-insulated and comprises a metal grounding shell and a high-voltage conductor coaxially disposed therein. The device comprises an insulating tube disposed between the envelope and the conductor, perpendicular thereto, thus allowing supporting the conductor and guiding a conductive moving part of this conductor grounding.

The energy level, when closing a fast grounding device, in the field of high voltage or ultra high voltage is so high that there is a need to oversize each component of the device .

One technique to avoid such oversizing may consist in the protection, in the dielectric sense of the term, of the ground rod by a cover, which follows its movement. However, this cover must stop when the initiation of the connection occurs, while the grounding rod continues its movement, until it comes into contact with the tulip of the fixed part.

The object of the invention is to provide a drive system of a follower cover meeting this requirement, for an equipment earthing.

Summary of the invention

• un carter guide qui est fixe ;
• une tige de mise à la terre montée coulissante longitudinalement par rapport au carter guide pour pouvoir être mise en contact avec un contact fixe du dispositif de mise à la terre ;
• un capot suiveur placé coaxialement à la tige de mise à la terre, autour d'elle et destiné à suivre cette tige de mise à la terre, sur une partie déterminée de sa course, et
• un coulisseau sur lequel est fixé la tige de mise à la terre entraîné par une bielle de manoeuvre et coulissant longitudinalement par rapport au carter guide.

For this purpose, the main object of the invention is a driving system for a follower cover for a fast grounding device, the latter comprising:

• a guide casing which is fixed;
• a grounding rod slidably mounted longitudinally with respect to the guide housing so that it can be brought into contact with a fixed contact of the grounding device;
• a follower cover placed coaxially with the grounding rod, around it and intended to follow this ground rod, on a determined part of its course, and
• a slide on which is fixed the grounding rod driven by an operating rod and sliding longitudinally relative to the guide housing.

• une gâchette pivotante autour d'un axe de gâchette fixé perpendiculairement sur la tige de mise à la terre et comprenant :
  • *une première extrémité de butée, et
  • *une deuxième extrémité de blocage, décalée angulairement par rapport à la première extrémité d'environ 90° ;
• une butée fixe par rapport au carter guide placée sur le chemin de la première extrémité de butée pour faire pivoter la gâchette dans un premier sens déterminé au moment où le capot doit s'arrêter pendant la fermeture du dispositif de mise à la terre et libérer le capot suiveur, et
• une butée mobile solidaire du capot suiveur placé sur le chemin de la première extrémité de la gâchette, placée du côté opposé à la première butée par rapport à l'extrémité de butée, pour faire pivoter la gâchette dans un deuxième sens opposé au premier sens, lors de l'ouverture du dispositif de mise à la terre et entraîner le capot suiveur conjointement à la tige de mise à la terre.

According to the invention, the system comprises:

• a trigger pivoting about a trigger axis perpendicularly attached to the ground rod and comprising:
  • * a first abutment end, and
  • * a second locking end, angularly offset from the first end of about 90 °;
• a fixed stop relative to the guide housing placed on the path of the first end stop to rotate the trigger in a first direction determined at the time the hood must stop during the closing of the grounding device and release the follower hood, and
• a mobile stop secured to the follower cover placed in the path of the first end of the trigger, placed on the opposite side to the first stop relative to the stop end, to rotate the trigger in a second direction opposite to the first direction, when opening the earthing device and driving the follower cover together with the grounding rod.

In the preferred embodiment of the system according to the invention, the follower cover is fixed to columns which are themselves fixed on a column-holder piece mounted to slide longitudinally and equipped with the movable stop capable of being driven by the second locking device and the trigger end of the trigger.

List of Figures

• figure 1, en coupe et en vue cavalière, le système selon l'invention monté sur un dispositif de mise à la terre ;
• figure 2, en vue cavalière, le même ensemble que la figure 1, mais sans coupe, et
• figure 3, en coupe plus détaillée, le système d'entraînement selon l'invention.

The invention and its various technical features will be better understood on reading the detailed description of an embodiment of the invention, accompanied by three figures respectively representing:

• figure 1 , in section and in a cavalier view, the system according to the invention mounted on a grounding device;
• figure 2 , in cavalier view, the same set as the figure 1 but without cut, and
• figure 3 , in more detailed section, the drive system according to the invention.

Detailed description of an embodiment of the invention

With reference to the figure 1 , the earthing device to which the system according to the invention applies comprises, inter alia, a ground rod 1, slidably mounted longitudinally with respect to a guide housing 9 which symbolizes the frame of the grounding device. A follower cover 2 is mounted around the grounding rod 1, by means of two columns 3, mounted themselves sliding longitudinally in the guide housing 9. Driving means of the grounding rod 1 are required and are symbolized here by an operating rod 8 sliding this ground rod 1 in the direction of a fixed contact 20 of the grounding device.

The follower cover 2 is supposed to follow the longitudinal progression of the ground 1 over a large part of the race of the latter, to stop at a specific location, while the ground rod 1 continues its progression until it comes into contact with the fixed contact 20.

The driving system of the follower cover according to the invention mainly comprises a trigger 6 pivotally mounted about a trigger axis 6A perpendicular to the longitudinal axis of the grounding rod 1 and therefore the setting device. Earth. This axis of rotation of the trigger 6 is fixed relative to the grounding rod 1. As a result, this trigger 6 undergoes the longitudinal comings and goings made by the grounding rod 1 relative to the guide housing 9. It is noted that a part called column-holder 10, supporting the columns 3 is also slidably mounted inside the guide housing 9. The function of the trigger 6 is to drive the assembly column-holder 10 / columns 3 / follower hood 2 on the part determined the path of the ground rod 1, when closing the earthing device.

The figure 2 shows the same set as the figure 1 , except for the fixed contact 20. However, part of the guide housing 9 has been put back in its place and thus hides the inside of the assembly, including the drive system. There is still the follower cover 2, the ground rod 1, the columns 3, the guide housing 9 and the drive rod 8.

The figure 3 shows in detail the mechanism of the drive system according to the invention. The main member is therefore the trigger 6 pivotally mounted around the trigger axis 6A mounted perpendicular to the grounding rod 1.

A first end called stop 6B of the trigger 6 has a round shape called roll 5. The orientation of this end stop 6B is such that, whatever the angular position of the trigger 6, the roller 5 is on the trajectory of an abutment 10A of the column-holder 10 and placed at the opposite of the follower cap with respect to the roller 5.

A second so-called locking end 6C is angularly offset relative to the first end stop 6B of the trigger, at an angle of about 90 °. This second locking end 6C has a hook shape so as to be able, after pivoting of the trigger 6 in the trigonometric direction with respect to this figure 3 , go on the trajectory of the abutment 10A of the column-holder 10.

During operation of the assembly, for a closure of said grounding device, the operating rod 8 is actuated by a geared motor not shown. It drives in longitudinal translation the slider 7 carrying the ground rod 1. At the beginning of this operation, the trigger 6 has a position different from that represented on this figure 3 , that is, an angular offset in the trigonometric direction. As a result, the locking end 6C passes under the abutment 10A of the column-holder 10. Consequently, from the beginning of the driving of the slider 7 by the operating rod 8, the column-holder 10 is driven in translation. With the ground rod 1. As a result, the follower cover follows the earth rod 1. The trigger 6 is held in this position, said closed by a return spring not shown in these figures. On the figure 3 , the trigger 6 is not in the closed position, but is in an open position.

During this closing phase, after a displacement of a predetermined length, the roller 5 of the trigger 6 abuts on a stop 9A of the guide housing 9, placed on the path of the roller 5, on the side of the follower cover. This has the effect of turning the trigger 6 clockwise and thus to release the column-holder 10. The earth rod 1 continues its displacement alone, while the column-holder 10 is stopped by dampers 4 located on its longitudinal path, the side of the follower hood. As a result, the displacement of the posts 10 and the follower cover is thus stopped, while the ground rod 1 has come into contact with the fixed contact of the grounding device.

In the opening phase of the rapid grounding device, the connecting rod 8 drives the assembly of the earth rod 1, via the slide 7 in the opposite direction, that is to say say to the right on the figure 3 . At a determined displacement to the right, the roller 5 comes into contact with an abutment 10A of the column-holder 10, which has the effect of rotating the trigger 6 in the counterclockwise direction and returning it to the closed position, the end 6C of the trigger 6 to the right of the abutment 10A of the column holder 10. The latter is thus driven together with the grounding rod 1 to the open position of the grounding device also taking the posts 10 and the follower hood.

Advantages of the invention

The different strokes of the grounding rod and the follower hood can be easily adapted to the needs of each device.

There is no major risk of changes in these races and these displacements in time, compared to a possible solution of friction drive of a spring.

It should be noted that, even in the event of a fault in the trigger holding spring 6, the triggering spring 6 will automatically cause the balancer holder 10, when opening the quick ground device. This has the effect of ensuring that the follower cover has returned to its original position despite this defect.

The mechanism of this system is relatively simple and can be used on existing earthing control devices and can be of relatively low compactness.

Finally, since the relative position of the follower cover with respect to the ground rod is adjustable at the length of the columns, this system can be adapted to any type of ground control.

Claims (2)

1. A follower cap (2) drive system for a fast grounding device, said system comprising:

   • a guide casing (9) that is stationary;

   • a grounding rod (1) mounted to slide longitudinally relative to the guide casing (9) in order to be put in contact with a stationary contact (20) of the grounding device;

   • a follower cap (2) placed on the same axis as the grounding rod (1), positioned around the axis and designed to follow said grounding rod (1) over a determined fraction of its stroke; and

   • a slide (7) on which the grounding rod (1) is fastened, driven by a drive rod (8) and sliding longitudinally relative to the guide casing (9);

   the system being characterized in that it comprises:

   • a trigger (6) pivotally mounted about a trigger pin (6A) that extends perpendicularly on the grounding rod (1), the trigger itself comprising:

   * a first end referred to as an abutment end (6B); and

   * a second end referred to as a blocking end (6C) offset angularly relative to the abutment first end (6B) by about 90°;

   • a stationary abutment (9A) of the guide casing (9) placed on the path of the abutment end (6B) of the trigger (6) in order to cause the trigger to pivot in a determined first direction when the follower cap (2) is required to stop during closing of the grounding device and thus release the follower cap (2); and

   • a movable abutment (10A) secured to the follower cap (2) and placed on the path of the abutment end (6B) of the trigger (6), being placed relative to the abutment end (6B) of the trigger on its side remote from the stationary abutment (9A) in order to cause the trigger (6) to pivot in a second direction opposite to the first direction, during opening of the grounding device and to drive the follower cap (2) together with the grounding rod (1).
2. A system according to claim 1, characterized in that the follower cap (2) is fastened to posts (3), themselves fastened to a post-carrier (10) mounted to slide longitudinally and including the abutment (10A) capable of being driven by the blocking end (6C) and by the abutment end (6B) of the trigger (6).

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