JPS6214085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that fixed contacts are divided into odd numbers and even numbers and arranged in a circle on different faces, and a contact bridge that can be pivoted in steps from contact to contact is arranged on each face. a tap, in which one end of the contact bridge is in constant contact with a contact ring inside its face, and a connecting conductor leading to the switching switch is respectively connected to said contact ring; The present invention relates to a single-phase or polyphase tap selector for on-load tap changers of switching transformers. In the case of this known tap selector, depending on the desired number of steps, more or less fixed contacts per side are arranged in a circle on a corresponding number of insulating bars. Depending on the number of contacts or insulating rods, the dimensions of the tap changer increase.
In some cases, for example on-load tap changers for electric furnace transformers, a very large number of steps are required, and in this case the dimensions of the tap selector may be very large depending on the circumstances. There must be. On the one hand, this requires a large amount of space;
On the other hand, it is not possible to construct such a tap changer, for example, from standard parts. This is because it requires an intermittent transmission with a very high number of steps and a specific selector gauge. We have therefore resorted to placing two tap selectors constructed from standard parts side by side, but this still requires more space than a single selector of suitably sized dimensions.

Therefore, the present invention takes other measures. and,
It is an object of the present invention to provide a tap selector of the type mentioned at the outset with a large number of steps, which can be manufactured from standard parts and requires little space. This task is solved according to the invention by:
Odd and even contacts are each provided on two sides, both contact rings belonging to the odd contacts and both contact rings belonging to the even contacts are conductively coupled to each other, and in each operating position: such that only one of the two mutually offset and mutually connected contact bridges rests on a fixed contact, and the other contact bridge is in each case located between two contact members; This is achieved in that the two rigidly connected contact bridges belonging to the odd number of contacts are offset from one another in exactly the same way as the two rigidly connected contact bridges belonging to the even number of contacts. Ru.

The advantage resulting from the invention lies, inter alia, in that the new tap selector can be constructed from structural parts used in conventional tap selectors. The dimensions of the tap selector correspond to the standard one. That is, it does not increase compared to the standard one. This new tap selector simply has a longer structural length compared to the standard one. This is generally not a problem.

Embodiments of the invention shown in the figures will be described in detail below.

As can be seen in FIG. 1, the new on-load tap changer consists mainly of a tap changer head 21 containing the drive means, a changeover switch 22, an intermittent transmission 23 and a tap selector. It consists of a vessel 24. These elements are arranged one above the other in the usual manner. The cylindrical tap selector 24 itself essentially consists of five insulating rods 25 and a selection post 28 located in the center of the cylinder. The insulating rod is fixed to the upper flange 26 and the lower flange 27, and is connected to the fixed contact 1.
It carries ~20. The selection column 28 also carries contact rings 29, 30, 31, 32 and accommodates connection conductors 33, 34 leading to the switching switch 22. contact ring 29,
Between 30, 31, 32 and the fixed contacts 1-20 there are contact bridges 36, 37, 38, 39, which are moved stepwise around the selection column by operating rods 40, 41. It can be rotated.

The fixed contacts 1-20 are divided into odd and even numbered contacts. In this case, odd-numbered contacts and even-numbered contacts are each provided in two planes. Figures 2a and 2b particularly show both sides of the odd number of contacts mentioned above. This arrangement can also be seen from Figure 3. Furthermore, odd number contacts 1, 5, 9, 1
3, 17 in the first partial plane a ₁ (see FIG. 2a), and the odd number of contacts 3, 7, 11, 15,
19 is provided in the second partial surface a ₂ (see FIG. 2b). Similarly, even number contacts 2, 6, 1
0, 14, 18 are provided in the partial surface b ₁ and an even number of contacts 4, 8, 12, 16, 20 in the partial surface b ₂ (see FIG. 3). Each partial surface has its own contact bridges 36 to 39, which are in constant rubbing with the associated contact rings 29 to 32 and which move from one stationary contact to the next stationary contact of the surface. It can be rotated step by step. This takes place by actuating rods 40, 41 which are pivoted around selection rod 28 by intermittent transmission 23. In this case, both contact bridges 36, 37 of partial surfaces a ₁ , a ₂ are fixedly connected to each other and are driven by the same actuating rod 40. Furthermore, the two contact bridges 36, 37 are such that in each operating position only one of the two contact bridges, for example contact bridge 36, rests on a contact, for example 1 (see FIG. 2a), and the other contact bridge, They are offset from each other such that, for example, 37 is located in an intermediate position between two contacts, for example 3 and 19 (see FIG. 2b). The same applies to both contact bridges 38, 39 of both partial surfaces b ₁ , b ₂ of the even number of contacts (see FIG. 3). This means that the individual switching step of each surface corresponds to half the distance 42 of the two contacts of one surface.

Now, when one switching advance is carried out starting from FIG. Moving onto the contact 3, the other contact bridge 36 reaches a free position between the two contacts 1 and 5. If contacts 1, 2 were previously selected or preselected, then contacts 2, 3 are selected. This is because, in this switching step, no changes occur in the lower partial surfaces b ₁ , b ₂ . For the first time in the next switching step, the contact bridge 3, which is also fixedly connected,
8,39 moves to the left by one step. Contact bridge 39 thus leaves contact 2 and reaches a free intermediate position between contacts 2 and 6, and contact bridge 38 moves onto contact 4. That is, then contacts 3 and 4 are selected or preselected. In this structural embodiment, contact rings in pairs, for example contact rings 29 and 30 of odd numbered contacts, conduct in exactly the same way as contact rings 31 and 32 in pairs of even numbered contacts. Of course, it is important that they are interconnected in this way. This means that the connecting conductors 33, 34 leading to the switching switch 22 are connected to both contact rings 29 and 30 or
1 and 32, this is easily achieved.

It is self-evident that the invention is not limited to the above embodiment with five insulating bars. The number of insulating bars of the selector depends firstly on the number of positions required and secondly on the typical program of standard implementation of the tap selector. Furthermore, the individual partial surfaces a ₁ , a ₂ , b ₁ ,
It is also possible to arrange b ₂ in other orders. Also, the contact bridges 36 and 37 or 38 and 39 are arranged in pairs and are shifted from each other by half the contact spacing.
can also be shifted from each other by, for example, 1.5 times or 2.5 times the contact spacing.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a single-phase on-load tap changer.
2a and 2b are schematic cross-sectional views of odd-numbered contacts of the tap selector in both sides, and FIG. 3 is a schematic exploded view of the tap selector. Codes in the figure, 1 to 20... Contacts, 29, 30,
31, 32...contact ring, 36, 37, 38,
39... Contact bridge, a ₁ , a ₂ , b ₁ , b ₂ ... surface.

Claims (1)

[Scope of Claims] 1 Fixed contacts 1 to 20 are divided into odd numbers and even numbers and are arranged in a circle on different surfaces a ₁ , a ₂ , b ₁ , b 2 , and the fixed contacts 1 to 20 are arranged in a circle on different surfaces a 1 , a 2 , b 1 , b ₂ , and the fixed contacts 1 to 20 are divided into odd numbers and even numbers and arranged in a circle in different planes a 1 , a 2 , b 1 , and b 2 . An progressively pivotable contact bridge 36, 37, 38, 39 is provided in each plane such that one end of the contact bridge always rubs against the contact ring 29, 30, 31, 32 inside that plane. , for each phase in a single-phase or polyphase tap selector for an on-load tap-changer of a tap-changing transformer, in which the connecting conductors 33, 34 leading to the switching switch 22 are each connected to said contact ring. , odd number and even number fixed contacts 1-2
0 in each of the two planes (a ₁ , a ₂ or b ₁ , b ₂ ), both contact rings 29, 3 belonging to the odd number of contacts
Both contact rings 31 belonging to 0 and even numbered contacts,
32 are electrically conductively connected to each other, and the two contact bridges 36, 37, which are fixedly connected to each other and belong to the odd numbered contacts, and the two contact bridges 38, 39, which are fixedly connected to each other and which belong to the even numbered contacts, are connected next to each other. , i.e. in each operating position, the two contact bridges (e.g. 3
6 or 38) abuts one fixed contact (e.g. 1 or 2), and the other contact bridge (e.g. 37, 38) bears on two contacts (e.g. 3 and 19 or 4 and 20). A tap selector characterized in that the taps are shifted so that they are located in between.