JPH0855741A - Load tap selector - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The tap device under load can be easily attached to the switching shaft, does not need to have a hole in the switching shaft, and can be attached and removed exclusively from the outside. Provide a load tap selector for a transformer. [Structure] The load tap selector includes a cylindrical oil container 1 having a fixed contactor 2 provided therein, and a rotatable switching shaft 4 provided inside the oil container. One contactor support 5 or a plurality of contactor supports 5 are fixed to the switching shaft. Each contact support 5 comprises at least one switching contact 6, by means of which the fixed tap contact can be switched. Each contact support 5 is fixed to the switching shaft 4 by a clamp ring 9 having two parts. The contactor support 5 is fixedly connected to a part of a clamp ring 9 consisting of two parts.
Both parts surround the switching shaft and are fastened to each other by fixing means 10, 11 provided outside the switching shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a cylindrical oil container having a fixed tap contact inside, and a switching shaft provided inside the oil container and rotatable by a driving means. The contact support is fixed to the switching shaft, or the plurality of contact supports are fixed to the switching shaft in a plurality of vertical phases, and the contact supports each have at least one switching contact. The present invention relates to a load tap selector for a load tap change transformer, in which a fixed tap contact can be changed by the change contact.

[0002]

2. Description of the Prior Art Such a load tap selector is known from DE-A 32 26 854.

In the case of load tap selectors, uninterrupted switching operations are performed under voltage between adjacent taps of the load tap switching transformer windings. At that time, the load tap selector simultaneously has the functions of a tap selector and a switching switch.
The tap selector selects the winding tap of the switching switch, which is switched each time. The switchgear briefly connects one or more resistors to provide uninterrupted current switching from the original tap to the new tap.

Such a load tap selector is essentially
It consists of an oil container formed by an insulating cylinder and a tap change insert inside it. The upper end of the oil container is closed by a load tap selector head and the lower end is closed by the bottom of the oil container. The inner wall of the oil container is provided with fixed contacts of the tap selector in planes separated from each other, the outside reaching the connecting contacts. The tap changer insert includes a movable contact device in its entirety, a centrally supported changeover shaft, a load tap selector changeover element,
Optionally, a preselector-contact support is provided.

At this time, the movable contactor device is composed of individual contactor supports provided above and below. The contact supports are each fixed to the switching shaft in the same horizontal plane as the associated fixed contact. The contactor support itself is
It is provided with a switching contact and one or more auxiliary switching contacts provided on the side of the switching contact.

In the past, the contact carrier was fixed to the switching shaft, which was usually formed as a rigid paper tube or a glass fiber reinforced casting resin tube, by means of bolts passing through this tube.

[0007] This is a machine publication "Tapping switch under load V type" (printed publication VK02 / 81de-1081 / 250) published by Masinin Fabry Rheinhausen GM Behr.
As is known from U.S.A. The contour of this fixed flange matches the outer curvature of the switching shaft.

A similar fixing of the contact carrier is described in the company publication "Trough Union TU-Tap load changer for transformers".
The basic type train L ”(printing publication 41.6.61 / 3.85). In this case as well, the contact carrier is bolted to the switching shaft. Engages with the recess of the.

On the one hand, these known fixing methods have the disadvantage that the switching shaft must be provided with a hole, which is mechanically expensive and is undesirable for electrical and strength reasons. is there. On the other hand, bolting through the switching shaft is cumbersome. This is because the fixing means must be handled and operated from inside the switching shaft.

[0010]

Therefore, an object of the present invention is to easily attach the contact device to the switching shaft, without the need to provide a hole in the switching shaft, and to install and remove it exclusively from the outside. It is possible to provide a load tap selector that does not need to engage tools, holders, etc. inside the switching shaft.

[0011]

This object is to fix each contact support to the switching shaft by a two-part clamp ring and to fix the contact support to a part of the two-part clamp ring. This is solved by the fact that both parts of the clamp ring are connected and surround the switching shaft and are clamped to each other by means of fixing means provided on the outside of the switching shaft.

The dependent claims relate to advantageous embodiments of the invention.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. The figure shows a schematic horizontal section of a load tap selector according to the invention.

The load tap selector normally comprises a switching shaft 4 which extends vertically through the oil container formed by the insulating cylinder 1 and the bottom and head parts (not shown). ing. This switching shaft comprises one or a plurality of horizontal contactor supports 5 fixed to one another.

The switching shaft 4 is likewise rotatable by means of known drive means, not shown, so that the fixed contacts 2 provided inside the insulating material cylinder 1 are in the same horizontal plane and in each contact carrier. It can be switched by 5. This fixed contact is connected to the winding of the connected tap change transformer under load via a conducting wire 3 guided to the outside.

Each contact support 5 comprises a switching contact 6 formed as a roller contact, and two auxiliary switching contacts 7, 8 provided on both sides thereof, which are also roller contacts. . The electrical connections to the individual contacts and load conductors are not shown.

Each contact carrier 5 is fixed to the switching shaft 4 by a two-part clamping ring 9 according to the invention. The clamp ring 9 is fastened and fixed to the switching shaft 4 by fixing means such as bolts 10 and 11. Instead of the fixing means 10 and 11 on both sides as shown in the figure, one fixing means (bolts or the like) is used for tightening, and a locking connection portion, for example, a hinge or the like is provided on the opposite side. it can.

Further, the contact support 5 is attached to the clamp ring 9
May be separately fixed to the above-mentioned part, or the contactor support 5 itself may be formed as an integral part of a part of the clamp ring 9 as shown in the drawing. In both cases, it is not necessary to provide the switching shaft with a hole through which a fixing means reaching the inside of the switching shaft 4 is inserted. The entire contact support 5 is fixed exclusively by the fixing means 1 which extends particularly horizontally outside the switching shaft 4 and which can be freely handled and operated.
It is performed by 0 and 11.

In another advantageous embodiment of the invention, the switching shaft 4
At least one centering aid is provided on the outer surface of the. This centering aid corresponds to the clamping ring 9 and ensures the unambiguous positioning of the contact carrier 5 and at the same time an additional anti-rotation. For that, blind hole 1
3 is provided on the switching shaft 4. A centering pin 12 is fixed in this blind hole. This centering pin is further provided with a recess 1 on the inner surface of the clamp ring 9 on the switching shaft 4 side.
6 is engaged.

Advantageously, the clamping ring 9 has a curvature of its inner surface on the side of the switching shaft 4 which substantially matches the outer contour of the switching shaft. According to another embodiment of the invention, the clamp ring 9 is provided on its outer circumference with one or more flanges 14. Other components, for example resistors, shield rings, etc. are arranged on the flanges of the clamp ring 9 and thus on the switching shaft 4 with which it makes a rotational movement, for example using screw holes 15.

[0021]

In the load tap selector according to the present invention, the contactor device can be easily attached to the switching shaft,
There is an advantage that there is no need to provide a hole in the switching shaft, it can be attached and detached exclusively from the outside, and there is no need to engage tools, holders, etc. inside the switching shaft.

[Brief description of drawings]

FIG. 1 shows a schematic horizontal cross section of a load tap selector according to the invention.

[Explanation of symbols]

1 Insulating Material Cylinder 2 Switchable Fixed Contact 3 Conductor 4 Switch Shaft 5 Contact Support 6 Switch Contact 7, 8 Auxiliary Switch Contact 9 Clamp Rings 10 and 11 Fixing Means 12 Centering Pin 13 Blind Hole 14 Flange 15 Screw hole 16 Recess

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Rolf Schyutlempel, Federal Republic of Germany, 93057 Regensburg, Brandle Berger Strasse, 140

Claims (5)

[Claims] 1. A single contact support is provided with a cylindrical oil container provided with a fixed tap contact inside and a switching shaft provided inside the oil container and rotatable by a drive means. Fixed to the switching shaft, or a plurality of contactor supports are vertically fixed to the switching shaft in a plurality of phases, and each contactor support has at least one switching contactor;
In a load tap selector for a load tap change transformer, in which a fixed tap contact can be switched by means of this switching contact, each contact support (5) is provided by a two-part clamp ring (9). A clamp ring (9) fixed to the switching shaft (4) and having a contactor support (5) in two parts.
Fixedly connected to a part of the switch ring, both parts of the clamp ring (9) surround the switching shaft (4) and are fastened to each other by fixing means (10, 11) provided outside the switching shaft (4). A load tap selector characterized in that 2. Load tap selector according to claim 1, characterized in that the contact carrier (5) is formed as an integral part of a part of a two-piece clamping ring (9). 3. Load tap selector according to claim 1, characterized in that the curvature of the inner surface of the two-part clamp ring (9) substantially matches the curvature of the surface of the switching shaft (4). 4. An outer surface of the switching shaft (4) is provided with at least one centering aid member (12), the contour of the centering aid being coincident with the inner surface of the two-part clamp ring (9), 4. The load tap selector according to claim 1, characterized in that it guarantees unambiguous positioning and rotation protection. 5. One or more flanges (14) for fixing, on its outer circumference, two parts of a clamp ring (9) to other parts for rotating the switching shaft (4).
The load tap selector according to any one of claims 1 to 4, further comprising: