DE6941941U - HIGH VOLTAGE DISCONNECTOR OR EARTHING SWITCH - Google Patents

Description

Disconnector or earthing switch for high voltage

The innovation relates to a disconnector or earthing switch for high voltage with a disconnection or an earthing switch that can be pivoted by about 90 °. Earth knife, which is an additional one in the area of contact Executes pushing movement.

Such switches are characterized above all by a safe Eontaktgabe that a loosening of the contact pieces z. B. by prevents electrodynamic stress in the event of a short circuit. Due to the fact that the separating or earthing knife in the If a fixed contact piece is pushed in, the cutting or earthing knife can no longer be thrown open. This also results in a more reliable opening and closing process with ice. The additional pushing movement of the cutting or earthing knife is mostly achieved by an in a sliding pivot axis. Such designs are cumbersome and expensive. The sliding bearings are subject to severe wear and tear. Especially with earthing switches that have to bridge a vertical distance, there is also the fact that the earth knife in the backdrop must be raised, which is generally not without counterweights Compensation of the dead weight of the earth knife is possible.

The innovation is based on the task of the drive of the Trennbzw. Erdermesser that at issue switchgear to ver -, where better esp sliding bearings are avoided.

should.

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Pat 4 (368. ZXXUZM

668/69

This object is achieved according to the invention in that the circuit breakers or earthing switches mentioned at the beginning Art a crank system with two cranks serves as the drive, the coupling of which through the drive-side end of the Earthing or disconnecting knife is formed and its cranks for the area of contact are approximately parallel.

The advantages achieved with the innovation are, in particular, that the pivoting / pushing movement without sliding bearings is achieved. As a result, the wear on the bearings is significantly cheaper, and the sequence of movements is more precise no need to attach counterweights.

Two embodiments of the innovation are shown in the drawing and are described in more detail below.

Show it

1 shows an earthing switch in the "on" switching position; FIG. 2 shows the same switch in the "off" switch position and FIG. 3 shows a two-post disconnector in the switch position "a".

As can be seen in particular from FIG. 1, the earthing switch consists essentially of a post insulator 1, which carries the contact device 2 to be connected to earth on its upper part, an earthing knife 3 and a drive part mounted in the base frame 4. The drive part consists of a crank arm system with the two cranks 5 and 6, which can be rotated about the fixed axes 7 and 8. The lower end 3a of the earth knife 3 serves as the coupling of the two crank arms 5 and 6. The crank arm system is arranged so that the crank arms 5 and 6 are approximately parallel for the contact area (see FIG. 1).

The mode of operation is as follows: If the earthing switch shown in FIG. 1 is to be switched off, the

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Crank 6 turned clockwise. Because the cranks 5 and 6 are initially in a parallel position to each other, the earth knife is initially lowered. With a larger angle of rotation, the lowering of the earth knife starts in a pivoting movement about, which takes place both around the pivot axis 7 and around the joint 9 between the crank 5 and the earth knife 3 (Fig. 2). The sequence of movements at the upper end of the earthing knife in the area of contact is shown in FIG. 1 Curve 10 shown.

Since sliding bearings are avoided in the new earthing switch, the switch-on process is carried out in the same way, only in the reverse order: starting from FIG. 2, when the crank 6 is turned counterclockwise first a strong upward pivoting movement of the earth knife 3, which at the end changes into a pushing movement because the cranks 5 and 6 then resume their approximately parallel position.

As shown in FIG. 3, the innovation can also be used without further ado with two-post isolating switches with a fly knife. The crank oscillating system with the cutting knife 13 is arranged on a support 11 in this case. And the fixed contact piece 12 is supported by a second support 11a. To open the cutting knife, as in the example of the earthing switch, the crank 16 is again rotated clockwise by an insulating rod (not shown). Because the crank 16 is coupled to the crank 5 via the drive-side end 13a of the cutting knife, the cutting knife 13 is first pushed again to the right so that it is pulled out of the fixed contact piece 12. Because the cranks then pass through more and more different angles of rotation, that is, change their parallel position, the cutting knife is pivoted upwards. The switch-on process is the reverse of the example of the earthing switch © .;

fi9 419 41

Pat 4 F 1 <868 '5000 / EA)

Claims (1)

Claim to protection 668/69 Disconnector or earthing switch for high voltage with a cutting or earthing knife that can be swiveled by about 90 °, which is in the area of contact with the fixed counter-contact executes an additional pushing movement, characterized in that a crank arm system is used as the drive with two cranks (5, 6 or 15, 16), whose coupling through the drive-side end (3a or 13a) of the Erderbzw. Cutting knife is formed and its cranks for the contact area are approximately parallel * - 694194! Pat 4 F 1 (868.5000 / EA)