JPH0580808B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention comprises a large number of fixed tap contacts arranged in a circular shape on the inner wall of an insulating cylinder, and a current flowing from the fixed tap contactor to the adjacent fixed tap contact. two switching contacts formed as contact rollers that can roll in both directions on a circular track, connected to a switching tube arranged rotatably in stages in the center of an insulating cylinder, In the stationary state of normal operation, both switching contacts are in contact with the first fixed tap contact, and when switching, the following switching contact remains in a conductive connection with the first fixed tap contact.
The present invention relates to a switching device for a load tap selector of an on-load tap-changing transformer, in which the other leading switching contact activates a transition resistor to reach the adjacent fixed tap contact.

[Conventional technology]

A switching device of this type is known from Japanese Patent Publication No. 59-29130 (German Patent No. 2520670).

[Problem of invention]

The object of the invention is to form a switching device for a load tap selector of a load tap-changing transformer of the type mentioned at the beginning with a simple construction.

[Means to solve problems]

The above-mentioned problem has been solved by the present invention in a switching device for a load tap selector of an on-load tap-changing transformer of the type mentioned at the outset, in which a switch on a circular bypass contact rail 4 provided on the inner wall of an insulating cylinder 1 is provided. rolling, flexible rotating conductor 12,1
a bypass contact roller 10, which is substantially coaxially connected to the respective attached switching contacts 5, 6 via 3;
11 are provided, and guide rollers 19 of double-armed levers 16 are provided on said switching cylinder, which enter into a number of recesses 20 provided in the inner surface of the bypass contact rail 4, said double-armed levers 16 respectively A bypass contact roller 10 attached to the switching contact 5 that engages with the corresponding projections 17, 18 of the two bearing levers 14, 15 that rotatably hold the rotating conductors 12, 13 and follows them during the switching process forms a double-arm lever. 16 is lifted from the bypass contact rail 4 by a tilting movement.

Further advantageous developments according to the invention are described in the dependent claims.

〔Effect of the invention〕

The advantages obtained with the invention are, in particular, that each series contact formed as a bypass contact roller is combined with a bypass contact formed as a bypass contact rail, which series contact also combines the functions of a bypass contact. The point is that it can be operated with a simple interlocking device. Another advantage is that by suitably configuring the connecting links controlling the series contacts, the series contacts can be involved in interrupting the current. In this configuration, a larger firing chamber is available for the contacts involved in interrupting the current as a whole. However, it is expedient if the series contact attached to the following switching contact lifts out of the circular bypass contact rail.

〔Example〕

In the following, embodiments of the invention are shown in the drawings and explained in more detail.

As is clear from FIG. 1, a large number of fixed tap contacts 2, 3 and one circular bypass contact rail 4 are arranged on the inner wall of the insulating cylinder 1.
Two switching contacts 5, 6, which are designed as contact rollers, are in contact with the fixed tap contact 2, which switching contacts 5, 6 are each guided by a contact holder 7, 8. Ru. Connected between the two switching contacts 5, 6 is a transition resistor 9 required for the switching process, which is shown only schematically. Associated with each switching contact 5, 6 is a further contact, a bypass contact roller 10, 11. These bypass contact rollers 10, 11 are both stationary and in contact with the circular bypass contact rail 4. Bypass contact roller 10,1
1 is arranged approximately coaxially with respect to the switching contacts 5 and 6, and each has one flexible rotating conductor 1.
It is electrically conductively connected to the switching contacts 5, 6 via 2, 13. The bypass contact rollers 10, 11 each have one bearing lever 14, 1 made of insulating material.
Guided by 5. The bearing levers 14, 15 and the contact holders 7, 8 of the switching contacts 5, 6 are arranged in the center of the insulating cylinder 1, and are supported by a switching cylinder (not shown) that rotates in stages. has been done. Furthermore, this switching tube also carries a double-arm lever 16, which is connected to one projection 17, 18 of each of the two bearing levers 14, 15.
engaged behind. The double arm lever 16 is
It has a guide roller 19 which rests in the recess 20 of the bypass contact rail 4 in the stationary state and holds the double-armed lever 16 in an intermediate position. During the switching process, the guide roller 19 leaves the recess 20. Therefore, depending on the respective switching direction, the double-arm lever 16 can be operated either on one bearing lever 14 or on the other bearing lever 15.
, the contact conductive connection between the bypass contact roller 10 or 11 and the bypass contact rail 4 is interrupted.

In the following, the functioning of the switching process will be explained in more detail with reference to FIGS. 2a to 2f. According to figure 2a,
In the rest position both switching contacts 5, 6 are in contact with the fixed tap contact 2. Similarly, both bypass contact rollers 1 attached to switching contacts 5, 6
0,11 also contact the bypass contact rail 4, and the guide roller 19 of the double-arm lever 16 is in the recess 20 associated with the fixed tap contact 2. Both switching contacts 5, 6 and both bypass contact rollers 10, 11 contribute to the current flow. According to FIG. 2b, from the fixed tap contact 2 to the tap contact 3
At the beginning of the switching process to
9 exits from the recess 20. The guide roller 19 thus disengages the bypass contact roller 10 from the bypass contact rail 4. In this case, since the switching contact 6 has not yet separated from the fixed tap contact 2, the current is applied to the switching contact 6 and the attached bypass contact roller 1.
This is done only via 1. As the movement progresses further (FIG. 2c), the changeover contact 6 changes to the fixed tap contact 2.
move away from Therefore, the generated arc is extinguished and the transition resistor 9 is activated, so that current is now supplied via the switching contact 5, the transition resistor 9 and the bypass contact roller 11. Then, in FIG. 2d, the switching contact 6 reaches the adjacent fixed tap contact 3, so that the load current now flows from the fixed tap contact 3 via the switching contact 6 and the associated bypass contact roller 11. . A circulating current flowing from the fixed tap contactor 2 to the fixed tap contactor 3 via the switching contactor 5 and the transition resistor 9 is superimposed on this load current. In FIG. 2e, the switching contact 5 separates from the fixed tap contact 2, interrupting the circulating current. and,
Finally, the new operating position is reached in FIG. 2f. In that case, the guide roller 19 moves into the next recess, so that both switching contacts 5, 6 and both bypass contact rollers 10, 11 again take over the conduction of the load current.

Figures 3a to 3f show an example of the movement sequence of the switching device in which the bypass contact rollers 10, 11 rolling on the bypass contact rail 4 participate in interrupting the current. According to FIG. 3a, again both switching contacts 5, 6 and both bypass contact rollers 1
0 and 11 contact the fixed tap contactor 2 and the bypass contact rail 4, respectively, and contribute to the conduction of the load current. First, the switching contact 6 separates from the fixed tap contact 2 (FIG. 3b). This operation occurs without power loss. This is because energization takes place only by the switching contact 5 and the associated bypass contact roller 10. In this case, guide roller 1
9 is still accumulated in the recess 20. Then,
As shown in FIG. 3c, the guide roller 19 is removed from the recess 20, and the bypass contact roller 10 is de-energized. As a result, the load current flows via the switching contact 5, the transition resistor 9 and the bypass contact roller 11. In FIG. 3d, since the switching contact 6 reaches the adjacent fixed tap contact 3, the load current now flows from the fixed tap contact 3 via the switching contact 6 and the bypass contact roller 11, but the circulating current is still flowing from the fixed tap contact 2 via the switching contact 5 and the transition resistor 9. This circulating current is
According to FIG. 3e, as soon as the switching contact 5 leaves the fixed tap contact 2, it is interrupted. Finally, in Figure 3f, both bypass contact rollers 10,
11 comes into contact with the bypass contact rail 4, the guide roller 19 again enters the recess 20 and the switching process is completed.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of the load tap selector in the contact area. FIGS. 2a to 2f are schematic circuit diagrams showing the progress of contact movement and energization state when power cutoff is performed only by the switching contact. Figures 3a to 3f are schematic circuit diagrams showing other movement progress and energization states when the series contactor is involved in power cutoff. Reference numerals in the figure: 1... Insulated cylinder, 2, 3... Fixed tap contact, 4... Bypass contact rail,
5, 6... Switching contact, 7, 8... Contact holder, 9... Transition resistance, 10, 11... Bypass contact roller, 12, 13... Flexible rotating conductor, 1
4, 15... Bearing lever, 16... Double arm lever, 17, 18... Protrusion, 19... Guide roller,
20... Concavity.

Claims (1)

[Scope of Claims] 1. A large number of fixed tap contacts 2 and 3 arranged in a circular shape on the inner wall of an insulating cylinder 1, and for switching the energized current from the fixed tap contact 2 to the adjacent fixed tap contact 3, It is connected to a switching tube rotatably arranged in stages at the center of the insulating cylinder 1, and includes two switching contacts 5 and 6 formed as contact rollers that can roll in both directions on a circular orbit. In the stationary state of operation, both switching contacts 5, 6 are in contact with the first fixed tap contact 2, and during switching the following switching contact 5 is electrically connected to the first fixed tap contact 2. in a switching device for a load tap selector of an on-load tap-changing transformer, in which the other leading switching contact 6 activates the transition resistor 9 and reaches the adjacent fixed tap contact 3 while remaining in the position of the insulating cylinder 1. The flexible rotating conductors 12, 1 roll on a circular bypass contact rail 4 provided on the inner wall.
a bypass contact roller 10, which is substantially coaxially connected to the respective attached switching contacts 5, 6 via 3;
a series contact formed as 11 is provided on said switching cylinder, and a guide roller 19 of a double-armed lever 16 is provided on said switching cylinder which enters into a number of recesses 20 provided in the inner surface of the bypass contact rail 4, said double-armed lever 16 being provided in each case with said double-armed lever 16; A bypass contact roller 10 attached to the switching contact 5 which engages with the corresponding projections 17, 18 of the two bearing levers 14, 15 which rotatably hold the rotating conductors 12, 13 and follows in the switching process forms a double-arm lever. A switching device, characterized in that it is lifted from the bypass contact rail 4 by a tilting movement of 16. 2. Switching device according to claim 1, characterized in that the lifting movement of the bypass contact roller 10 takes place before the preceding switching contact 6 leaves the energized fixed tap contact 2. 3. The switching device according to claim 1, wherein the lifting operation of the bypass contact roller 10 is performed only when the preceding switching contact 6 separates from the energized fixed tap contact 2. .