RU14318U1 - CABINET OF COMPLETE DISTRIBUTION DEVICE - Google Patents

Description

CABINET OF COMPLETE DISTRIBUTION DEVICE

The utility model relates to grounding attachments for enclosures of complete switchgears, which are used to ground disconnected sections of the primary circuit during repair and routine maintenance.

A device for grounding the busbars containing grounding knives of the chopping type is rigidly fixed to a common shaft (AS No. 1398005 M.cl. Н02В 1/16).

ABB Stromberg Distribution type chopping earthing is also known, which includes fixed contacts mounted on support insulators, movable knives mounted on a shaft, a spring with a rod inside, one end of which is pivotally mounted on the shaft, and the other end is inserted into the hole of the bracket located on the cabinet body (OJWN 2 GB catalog 90-06 Earthing Switches. With making capacity ABB ASEA BROWN BOVERI). For this design of the ground electrode system, large shock loads are characteristic at the moment of contact between the movable and fixed contacts, which causes a breakdown of the fixed knives and support insulators, in addition, this design does not allow you to adjust the position of the movable knives relative to the stationary ones during operation.

The proposed device provides smooth operation of the entire site, reducing shock loads, in addition, it allows you to adjust the position of the movable knives relative to the fixed, which increases the reliability and

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the durability of this device. The switchgear cabinet contains a chopping type earthing switch, which includes fixed contacts mounted on onor insulators, movable knives mounted on the shaft, a spring with a rod inside, one end of which is pivotally mounted on the shaft, and the other end is inserted into the bracket hole located on the ground electrode frame . In this case, unlike the prototype, the end of the rod located in the hole of the bracket has a thread, an adjusting nut, a damping washer is installed between the adjusting nut and the arm.

Figure 1 shows a General view of the described device in the "off" position when the busbars are earthed; 2 - section AA in the device position "off, in FIG. 3 - section AA in the device position" on.

The switchgear cabinet includes an earthing switch mounted on the frame 1, which is mounted on the panel panel. The earthing switch consists of supporting insulators 2 with fixed contacts 3 fixed to them. In addition, it has a shaft 4 on which movable knives 5 are fixed. Also, a bracket 6 with an axis 7 is fixed on the shaft 4. A shaft 8 with a spring 9 is installed on the axis 7. One end of the spring 9 abuts against the axis 7, and the other end - into the bracket 10 located on the frame 1. The rod 8 passes through the hole in the bracket 10 and has a thread at the end on which the adjusting nut I is located, and between the nut 11 and the bracket 10 there is a damping washer 12 made, for example, of rubber and a spherical washer 13.

The device operates as follows: in the off state (figure 2), the movable knives 5 are pressed against the frame element 1 by a spring 9. At the moment the earthing switch is turned on (Fig. 3), the shaft 4 rotates towards the movable knives 5, while the spring 9 is compressed, and after the axis 7 passes through the “dead center”, the spring 9 is unclenched until the movable knives 5 are connected to the fixed contacts 3. When the movable knives touch 9 with a fixed contact 3, the energy of the compressed spring 9 is extinguished by a damping washer 12, thereby preventing the destruction of the fixed contacts 3 and the supporting insulators 2. Using the adjusting nut 11, it is possible to correct the position of the movable knife 5 relative to the fixed contact 3. The spherical washer 13 acts as a guide during the movement of the rod 8 in the hole of the bracket 10.

The damper washer ensures the smooth operation of the entire assembly, the safety of fragile porcelain support insulators and fixed contacts made of soft metal.

Claims (1)

A cabinet of a complete switchgear comprising a chopping-type ground electrode system, including fixed contacts mounted on support insulators, movable knives mounted on a shaft, a spring with a rod inside, one end of which is pivotally mounted on the shaft, and the other end is inserted into the hole of the bracket located on the grounding frame, characterized in that the end of the rod located in the hole of the bracket has a thread, an adjusting nut, a damping is installed between the adjusting nut and the bracket Aiba.