DE2033854A1 - Earthing switch for metal-enclosed high-voltage switchgear - Google Patents

Description

Earthing switch for metal-enclosed high-voltage Switchgear

In metal-enclosed high-voltage switchgear, the Axis of the tubular enclosure is often a high-voltage conductor, which is opposite to the grounded enclosure with an electrically high-quality Gas, e.g. sulfur hexafluoride, can be isolated. Up to now, earthing switches have usually been used to earth the high-voltage conductor used with a pin-shaped grounding conductor, which is guided on the enclosure and is moved along its axis against the high-voltage conductor for grounding. Such earthing switches However, require a lot of space, -as the grounding conductor already without taking into account drive elements in the switch-off position by the distance encapsulation - high-voltage conductor over the extent of the encapsulation must protrude. The aim of the invention is therefore an earthing switch, which is the "earthing of the high-voltage conductor in metal-enclosed high-voltage switchgear with less space, without the need for a large one mechanical effort is required.

The earthing switch according to the invention is characterized in that the grounding conductor corresponds to the cross section of the enclosure has a correspondingly curved area which is pivotable about an axis extending transversely to the axis of the high-voltage conductor is arranged. Outside the enclosure, the new earthing switch only requires the space required for the drive. The drive only needs to produce a swivel movement. A pin outside the enclosure is therefore sufficient,

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attacked by a crank or the like. The grounding conductor itself can be a solid metal rod made of a highly conductive material. The metal rod, e.g. a round copper rod with a through, the Grounding current specific cross-sectional area, only needs to be adapted to the contour of the encapsulation. For example, can the grounding conductor has a quarter-circle arc as a curved area in the case of an encapsulation with a cylindrical cross-section, which can be pivoted about an axis running perpendicular to and through the axis of the high-voltage conductor. Since this form with the large radii of curvature, which are given by the encapsulation dimensions at 110 kV and more, can easily be produced by bending lets, the new earthing switch is a very simple device despite its small footprint.

It has proven to be useful to close the curved area at the point of contact with the high-voltage conductor with an in To provide the direction of movement of the grounding conductor extending contact part. The contact part can e.g. Intervene high voltage conductor. A corresponding mating contact for the contact can also be found on the high-voltage conductor Attach part of the grounding conductor so that the high-voltage conductor does not have to be worked on significantly.

In a particularly advantageous embodiment of the invention the grounding conductor is guided in a cover that covers an opening in the enclosure. This arrangement is particularly easy to use assemble and maintain. In addition, the lid can be adjusted if necessary, so that the movement of the grounding conductor in can be adjusted with respect to the high voltage conductor.

As mentioned, the curved part of the conductor performs a pivoting movement. The movements that occur are on smallest in the area of the swivel axis. For this reason, a current band leading to the encapsulation or a similar one can advantageously be used there Provide a conductive connection so that the storage point

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of the grounding conductor in the encapsulation is completely relieved of the current flow is.

For a more detailed explanation of the invention, the following is based on the simplified drawing is an example described. 1 shows the encapsulation of the metal-encapsulated high-voltage switchgear for 110 IcT in a cross-section, while Fig. 2 is a partial longitudinal section through the encapsulation.

In Fig. 1, 1 denotes the grounded metal enclosure, the ■ E.g. made of sheet steel. The cross section of the tubular Encapsulation is a cylinder: A high-voltage conductor runs along its axis 2. The high voltage conductor is a solid copper cylinder. However, the invention is neither limited to the particular form of the high-voltage conductor is still limited to a certain material. .- ■■■■ '.

In order to ground the high-voltage conductor 2, a grounding switch, designated as a whole as 3, is arranged in the encapsulation 1. The earthing switch 3 has an earthing conductor 4, the area 5 of which is curved as a quarter-circle arc and is pivotably mounted in the encapsulation 1 with a pin 6. For this purpose, a connecting piece 8 with a cylindrical cross-section is provided on the cylindrical encapsulation 1 and ends in a flange 9. A cover 11 is attached to the flange 9 with screws 10. In this, the pin 6 is guided in a bearing 12.

The pin 6 forms the pivot axis of the grounding conductor 4. How

you can see that the pivot axis is perpendicular to the axis .des

High voltage conductor 2, through the axis of the high voltage conductor through.

In the vicinity of the pivot axis, there is a copper strip 14 on the pin 6 attached. The end of the copper tape 14 facing away from the conductor

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is connected to the grounded metal enclosure 1 at a terminal 15. This creates a good electrical connection; secured between the grounding conductor 4 and the metal enclosure. The bearing 12 of the grounding conductor 4- "does not need to carry any current j *

In particular from Pig. 2 shows that the curved area of the grounding conductor 4 at the point of contact 17 with the high voltage conductor 2 has a contact part 18 extending in the direction of movement of the grounding conductor. This contact part takes effect when switching on the earthing switch 3, which is indicated by the movement arrow 19 is indicated in a recess 20 of the high-voltage conductor. So comes in the on position as with a Tulip contact creates a good electrical connection.

It can be seen from the figures that the new earthing switch for metal-enclosed high-voltage switchgear is an · extraordinary has a simple structure. Nevertheless, it gets by with little space. The switch can with the help of the cover 11 in which the grounding conductor 4 is stored, conveniently mounted and, if necessary, ^ stiert. All he needs is his drive a device that is able to pivot the pin 6 by about 90 °. The space required for this outside the enclosure is extremely small.

5 claims

2 figures BAD ORIGINAL

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Claims (5)

■: '- 5.- ■■■■ ..-. VPA 70/3755 -. Pa t e η t a n s ρ r ti 'c h e Vi. ^ / Earthing switch for metal-enclosed high-voltage switchgear with one running in the axis of the tubular enclosure High-voltage conductor and one led to the enclosure Earthing conductor that can be moved against the high-voltage conductor is, characterized in that the grounding conductor (4) has a the cross-section of the encapsulation (1) correspondingly curved region (5), which around a transverse to the axis of the high-voltage conductor (2) extending axis (6) is pivotably arranged. 2. Earthing switch according to claim 1 with one in cross section cylindrical encapsulation, characterized in that the curved area (5) is a quarter-circle arc which is perpendicular to a is pivotable to the axis of the high-voltage conductor (2) and through this axis (6). 3. Earthing switch according to claim 1 or 2, characterized in that that the curved area (5) at the point of contact (17) with the high-voltage conductor (2) has a direction of movement of the Has the grounding conductor extending contact part (18). 4. Earthing switch according to claim 1, 2 or 3, characterized in that that the grounding conductor (4) is guided in a cover (11) which covers an opening in the enclosure (1). 5. Earthing switch according to claim 1 or one of the following, characterized in that the earthing conductor (4) in the vicinity of the pivot axis (6) is provided with a current band (14) leading to the encapsulation (1) or a similar highly conductive connection . ' 109862/1082 Blank page