DE29509361U1 - Device for covering high-voltage rooms for medium-voltage switchgear - Google Patents

Description

Device for covering high-voltage compartments for medium-voltage switchgear
5

The invention relates to a device for covering high-voltage compartments for medium-voltage switchgear, in particular busbars and switchgear panels.

Such covers are known, for example, from DE 42 20 790 Al. They are used here to cover switchgear cells in which switching devices and busbars can also be arranged. The switchgear cell is closed in the upper area by a roof plate and contains a channel on the back for pressure relief and for the discharge of gases that arise when an arc fault occurs inside the switchgear cell. The outflow channel is formed at the top by zigzag-shaped sheets, which on the one hand form a large surface for better cooling of the gases and on the other hand protect the outflow opening of the channel from objects falling into it. The connection between the switchgear cell and the outflow channel is formed by a passage opening in the lower part of the switchgear cell.

The object underlying the invention is to define a device for covering high-voltage rooms which is considerably simplified in terms of structural design without reducing the arc-proof demarcation from the surroundings. According to the invention, this is achieved by the features

1.1. the cover contains an upper and a lower cover part with ventilation grooves directed outwards in the area of the immediate room cover,

1.2. the upper cover part is connected by non-detachable fastening elements to an upper frame part that surrounds the ventilation grooves, whereby between the upper

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at least one gas-permeable expanded metal is arranged between the cover part and the upper frame part,

1.3. the lower cover part is connected by non-detachable fastening elements to a lower frame part that surrounds the ventilation beads, with at least one further gas-permeable expanded metal being arranged between the lower cover part and the lower frame part,

1.4. the upper and lower cover parts are each provided with an approximately right-angled front bend,

1.5. the upper and lower cover parts are connected to one another by non-detachable fastening elements in such a way that the free outward-facing ends of the front bends are arranged approximately flush with a slot-like distance from one another, and that preferably the lower cover part is bent longitudinally in such a way that almost right-angled full-surface side boundaries are achieved for the front bends.

By providing the upper and lower cover parts, which are arranged almost entirely in the ceiling area of the high-voltage rooms, a structurally significantly simplified cover is created while retaining the property of an arc-proof boundary from the surroundings, with which the hot gases escaping in the event of an arc fault are sufficiently cooled. The perforated expanded metal arranged between the cover parts and the frame parts also ensures that the cover is highly elastic. On the other hand, the ventilation beads in the upper and lower cover parts in conjunction with the gas-permeable expanded metal ensure that the switchgear is sufficiently cooled in the normal operating state.

According to an advantageous embodiment of the invention, the feature

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2.1. the upper and lower cover parts are arranged in such a way that their respective ventilation grooves are offset from one another, so that the escaping gases are directed away and thus contribute significantly to the evening out of the pressure reduction in the high-voltage compartment. The offset arrangement of the ventilation grooves, which are each directed outwards, also provides sufficient protection against contact - poking protection - with respect to the equipment housed in the high-voltage compartments, such as switchgear, busbars, etc.

A further advantageous embodiment of the invention provides

The characteristic

3.1. The expanded metal is made of a sheet metal plate with uniform diamond-shaped openings, which means that a commercially available semi-finished product can be used for the expanded metal.

0 The invention is explained in more detail by an embodiment shown in two figures, whereby Figure 1 shows the device for covering according to the invention in section along line 1-1, shown in Figure 2, while the

Figure 2 shows an example of a cover for a busbar compartment.

Figure 1 shows the device for covering high-voltage compartments along the section line 1-1, as shown in Figure 2. Accordingly, the device for covering essentially has the upper and lower cover parts AR1, AR2, which are connected to one another by the fastening elements BE. The fastening elements BE are designed as non-detachable connecting elements and are realized by rivet connections. It can also be seen that the lower cover part AR2 is bent in such a way that a side

limitation SB. The upper cover part ARl and the lower cover part AR2 also each have the front cover FAl and FA2, which are designed in such a way that when the upper cover part ARl is joined to the lower cover part AR2, an unspecified slot-shaped distance is created between the two front covers FAl, FA2. Furthermore, the upper cover part ARl is connected to the upper frame part RTl and the lower cover part AR2 to the lower frame part RT2, also by non-detachable fastening elements BE. Between the frame parts RTl, RT2 and the cover parts ARl, AR2, at least one expanded metal SMl or several expanded metals SM2 are arranged. The expanded metals SMl, SM2 contain uniform openings so that the gases can pass through. In addition, the cover parts AR1, AR2 have corresponding ventilation grooves BSI, BS2, whereby the ventilation grooves BSI, BS2 of the upper and lower cover parts AR1, AR2 are offset from one another in such a way that the hot gases that occur in the event of an arc fault within the high-voltage compartment can be discharged in a directed manner according to the arrow arrangement in Figure 1. In addition, it is ensured that the offset of the ventilation grooves BSI, BS2 from one another provides sufficient contact and poking protection.

Figure 2 shows an example of part of a cover for a busbar compartment. Here it is clear that the upper and lower cover parts AR1, AR2 with their corresponding front bends FA1, FA2 are arranged approximately at right angles to the full-surface side boundary SB (shown in Figure 1). In addition, it is clear that the upper and lower cover parts AR1, AR2 are not detachably connected to the fastening elements BE.

Claims (3)

1. Device for covering high-voltage compartments for medium-voltage switchgear, in particular busbars and switchgear panels, characterized by the features 1.1. the cover contains an upper and a lower cover part (ARl, AR2) with ventilation grooves directed outwards in the area of the immediate room cover (BSI, BS2), 1.2. the upper cover part (ARl) is connected by non-detachable fastening elements (BE) to an upper frame part (RTl) that surrounds the ventilation beads (BSI), with at least one gas-permeable expanded metal (SMl) being arranged between the upper cover part (ARl) and the upper frame part (RTl), 1.3. the lower cover part (AR2) is connected by non-detachable fastening elements (BE) to a lower frame part (RT2) that surrounds the ventilation beads (BS2), with at least one further gas-permeable expanded metal (SM2) being arranged between the lower cover part (AR2) and the lower frame part (RT2), 1.4. the upper and lower cover parts (ARl and AR2) are each provided with an approximately right-angled front bend (FAl and FA2), 1.5. the upper and lower cover parts (AR1, AR2) are connected to one another by non-detachable fastening elements (BE) in such a way that the free outward-facing ends of the front bends (FA1, FA2) are arranged approximately flush with a slot-like distance from one another, and that preferably the lower cover part (AR2) is bent longitudinally in such a way that approximately rectangular full-surface side boundaries (SB) are created for the front bends (FA1, FA2). 95 b4087 2. Device according to claim 1, characterized by feature 2.1. the upper and lower cover parts (ARl, AR2) are assigned to one another in such a way that their respective ventilation grooves (BS1, BS2) are offset from one another. 3. Device according to claim 1 and claims 1 and 2, characterized by feature 3.1. the expanded metal (SM1, SM2) is realized by a sheet metal plate provided with uniform diamond-shaped openings.