DE2227330A1 - HIGH VOLTAGE DEVICES, IN PARTICULAR PRESSURE GAS SWITCHES - Google Patents

Description

High-voltage device, in particular gas pressure switch

In the case of high-voltage switches, in particular compressed gas switches, with several switching devices connected in series, whose switching points lie in a common axis, is common a drive element common to the switching devices is provided, which drives the switching devices. the switching devices at the same time opens and closes. A high-voltage switch with two switching devices connected in series is for example in of "Siemens-Zeitschrift", No. 8, August 1968, on pages 579 to 583. The well-known switch in which Sulfur hexafluoride is used as an extinguishing and isolating agent, has a drive element that is at right angles is guided movably towards the switching point axis and via a deflection gear, for example with angle levers, coupled with the drive rods for the switching points is.

If you have the drive for the switching points in addition interprets that it sets the extinguishing agent flow for the switching devices in motion, which is especially true for Blaskolbensysteraen If this is the case, it is necessary to have the gear housing for driving the contact pieces, which is at high voltage potential is to train torsion-resistant because of the forces and torques required and to be transmitted. For this purpose, the gear housing is provided with stiffening ribs at least on the outer casing side.

Such a construction of the gear housing lying on high voltage potential can lead to a distortion of the electrical Field between the housing outer wall, in particular

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the stiffening ribs, and the earthed switch housing of the gas switch leads.

The invention relates to a high-voltage device, in particular a gas pressure switch with a gear housing arranged within the switch housing and carrying high voltage potential for driving the contact pieces, the gear housing at least s _.; the outer shell side is provided with stiffening ribs. According to the invention, two half-shells made of electrically conductive material which surround the casing side and which together form a hollow cylinder are provided. The two half-shells are self-retaining in parts of the gearbox housing. In this way, the shielding of the gear housing required for field equalization can be achieved in a particularly simple manner and the assembly of the parts provided for the shielding can be simplified.

The transmission housing advantageously has two stiffening ribs radially overlapping end faces, between which the half-shells are fixed. The front sides Have edge grooves in which the inwardly directed, protruding edge webs of the half-shells engage.

If the gas pressure switch is exposed to vibrations during operation, which affects the electrical contact of the half-shells can affect the gear housing, screw elements are advantageously provided that the half-shells connect with the gear housing.

An exemplary embodiment of the invention with further advantages and details is described with reference to the drawing.

Figure 1 shows schematically a designed as a blow piston switch Compressed gas switch in a partially cut

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FIG. 2 shows part of the gas pressure switch according to FIG. 1 in a section on an enlarged scale.

FIG. 3 shows a section along the lines III-III from FIG. 2 shown schematically.

The gas pressure switch shown in Fig. 1 is a circuit breaker designed for a metal-enclosed high-voltage switchgear with sulfur hexafluoride as extinguishing and insulating gas and designed for a voltage of, for example, 220 kV or more. . , ■

The switch has a grounded metal housing 1, which consists of a cylindrical housing part 2 with three pipe sockets 3, 4 and 5 consists. The end faces of the cylindrical part 2 are closed with lids 6 and 7. Inside 10 of the cylindrical part 2 are two identical, electrically in series housed switched switching devices 11 and 12, which lie on a common axis. To each of the switching devices include two fixed electrodes 13 and 15, which are hollow and serve as nozzles for the flow of extinguishing agent to serve.

In the switched-on position, the electrodes 13, 15 are connected by a movable, hollow contact piece 14. Then the lead Circuit from the electrode 13, which is to be regarded as a stationary contact piece, via the contact piece 14 to the electrode 15, which like a sliding contact, the current from the switching piece 14 to a fixed metal housing 16, the gear housing, leads, which lies in the middle between the two switching devices 11 and 12.

A hollow post insulator engages on the gearbox housing 16. 20-on, which can e.g. consist of casting resin. The post insulator 20 is with the gear housing 16 in its high-voltage side

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End rigidly connected. The earth-side end of the insulator 20 protruding into the connector 4 is rigid on a cover 21 attached, which belongs to the housing of a switch actuator 22, e.g. a double-acting hydraulic press.

The switch drive 22 ensures a reciprocating movement of the in the direction of the axis of the isolator 20 consisting of insulating material drive member 24, which is guided at point 25 in the gear housing 16, which is made of metal is. As a result of the movement of the drive member 24, two reversing levers 26, 27 that can move in opposite directions are grounded via two connecting rods 28, 29 set in motion with the movable contact pieces 14 of the switching devices 11 and 12 via actuating rods 30 are coupled.

The actuating rods 30 are also connected to a blow cylinder 31 which, when switched off, has a stationary Blow plunger 32 is pulled so that the sulfur hexafluoride, which is compressed in the process and which passes through the hollow contact pieces 13 and 14 flows, causes the arc to be extinguished.

In Figures 2 and 3, the drive housing 16 made of metal is shown on an enlarged scale. It contains a Fixed pivot bearing 37 for the reversing levers 26, 27. On its part 16a carrying and guiding the reversing levers 26, 27 stiffening ribs 40 are provided on the outer shell side. These stiffening ribs 40, the fasteners for the Connection of the housing part 16a to the housing 16 and the post insulator 20 and possibly also protruding Flange parts, in particular edges, which lead to a distortion of the between the housing part 16a and the grounded metal housing 1 prevailing electric field are provided by two casing-side enclosing the gearbox housing I6o, Ralb shells 41, 42 forming a hollow cylinder are covered. the Ilalb-shells have inwardly directed, protruding edge-IS (J 985Π / 0Ρ66 BAD ORIGINAL - 5 -

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webs 43 with which they are in parts of the gear housing 16a are self-locking. The half-shells 41 and 42 are made of electrically conductive material and are with the made of metal gear housing 16, 16a connected in an electrically conductive manner.

In the illustrated embodiment, the transmission housing two end faces 44 which radially overlap the stiffening ribs 40 and between which the half-shells 41, 42 are fixed are. For this purpose, the end faces have edge grooves 45 into which the inwardly directed, projecting edge webs 43 the half-shells. 41, 42 intervene. To ensure a constant, electrically conductive connection between the gear housing 16, 16a and the calf shells 41, 42 can be a additional connection take place by means of screw elements 46, which are expediently arranged in a field-weakened space are.

The inwardly directed, projecting edge webs 43 advantageously have bending edges that are rounded and thus closed do not impair a uniform field course. · ■;

By applying the invention, it is possible to create a torsion-resistant Design for the gearbox housing to indicate the electrical field in the interior of the earthed switch housing not affected.

The invention is in connection with a gas pressure switch described; however, it can also be used advantageously for shielding other components in metal-enclosed, compressed gas-insulated high-voltage devices and systems, e.g. busbars, Disconnectors.

4 claims

3 figures 3098S0 / 0266 '- 6 -

Claims (4)

VPA 72/3756 Claims 1yHigh-voltage device, especially a compressed gas switch with a gear housing arranged within the switch housing and carrying high voltage potential for driving the contact pieces, wherein the gear housing is provided with stiffening ribs at least on the outer shell side, characterized by means of two half-shells made of electrical which surround the casing side and form a hollow cylinder conductive material, which are self-retaining in parts of the gearbox housing. . 2. High-voltage device according to claim 1, characterized in that the gear housing has two stiffening ribs radially having overlapping end faces, between which the half-shells are fixed. 3. High-voltage _{device according to claim 2 f,} characterized in that the end faces have edge grooves into which the inwardly directed, projecting edge webs of the half-shells engage. 4. High-voltage device according to one of claims 1 to 3, characterized by an additional connection of the half-shells with the gear housing by means of screw elements. 309850/0266 Blank page