JPS5917526B2 - Cylindrical load switch for tap transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION No. 0 The present invention provides a method in which fixed main and auxiliary contacts housed in a cylindrical oil container and arranged in a sector for the individual phases of a transformer are arranged in the oil container, tabs 5 of a tap transformer fixed side by side inside a second cylindrical container which is divided longitudinally into cylindrical covers; They are fixed to the lower and upper fixed parts at regular intervals so as to be replaceable from the outside, with an oil-insulated section between them, and the lower and upper fixed parts are formed as guide plates for the movable contacts. The present invention relates to a switching switch with a current limiting resistor for a tap changing device of a tap transformer consisting of 30 taps.

In such a switching switch, the current limiting resistor included in the switching switch, including the necessary current limiting resistor, is
The supports are relatively wide apart, and the mechanical strength of the cylindrical cover is affected by this.

On the other hand, if the insertion of the current limiting resistor is omitted, the upper and lower fixing parts can be juxtaposed relatively close together and the contact device can be placed directly between the two fixing parts, which in particular improves the mechanical strength. It is advantageous for Furthermore, the upper and lower fixed parts can simultaneously function as guide plates for the movable contacts.
However, the associated current limiting resistor must be specially installed, for example in the form of an additional component placed at the lower end of the cylindrical insert of the switching switch. This ensures that the insert of the changeover switch is no longer a closed structure, and that when the insert is placed outside the oil container, the additional components of the resistor must bear its full weight, and that the resistor must be supported during insertion. It is disadvantageous if the additional component also does not have a cylindrical shape. Furthermore, it is cumbersome to have to remove the cylindrical cover and remove the resistor each time for inspection. The object of the invention is to develop an insertion part of a mechanically very stable switching switch so that it has a construction as compact as possible and whose cylindrical cover can be assembled or removed in a simple manner.

The advantages obtained by the present invention are, among others, the following.

Great mechanical stability is obtained.

On the one hand, good mechanical reinforcement is produced at locations of high mechanical stress.

This is because the fixing parts, which at the same time serve as guide plates for the contacts, are relatively narrowly arranged, while the current limiting resistors are arranged in a cylindrical cover and are protected thereby. This mechanical protection of the current limiting resistor is particularly important when the insert part of the switching switch has to be placed once alone outside the cylindrical oil container. In the present invention, the stable installation edge is formed by a cylindrical cover. Furthermore, the cylindrical cover together with a one-phase current limiting resistor each forms a structural unit.

This simplifies removal of the insert for inspection.
Because the current limiting resistor carried by the cylindrical cover is
This is because there is no need to specifically release the connecting wires which remain in the cylindrical cover and are outside the cylindrical cover from the current limiting resistor to the contacts. The current limiting resistor can also be manipulated from the outside.

This ensures that even when the insert is finally assembled,
Resistor installation can be done later, if desired, in a simple manner. In other words, since the resistor installation of the switching switch often depends on the switching power to be handled, it is advantageous if the resistor installation can be carried out later on the insertion part of the switching switch that has been assembled in advance. A closed cylindrical structure is created for the entire insertion part of the switching switch.

This facilitates the insertion of the insert into the oil container. A further provided protrusion on the surface of the cylindrical cover has the advantage that the cylindrical insertion part is easily inserted into the outer cylindrical oil container. By means of this projection, the likewise protruding screw head, nut and connecting conductor are guided so that they do not come into contact with the upper edge of the outer oil container when the cylindrical insertion part of the switching switch is inserted into the oil container. Next, embodiments of the present invention will be described in detail with reference to the drawings. The novel switching switch essentially consists of an insert part 1 of the switching switch and a cylindrical oil container 2 consisting of an insulating cylinder 3 and a bottom 4.

The insertion part 1 of the switching switch can be inserted into the oil container 2 from above and pulled out again. The electrical connection is made by connecting a sliding contact 6, that is, a main contact, which is connected to an external tab terminal through a guide contact 5 penetrating an insulating cylinder 3, to a common terminal of a current limiting resistor 18 via a connecting conductor 22, and each The other terminal and the auxiliary contact 9 are connected via connecting conductors 20 and 21 in a well-known manner. The coupling 7 of the closing shaft 8, which is inserted downwardly through the base 4, is designed as a bayonet coupling. The insert part 1 is likewise of cylindrical design and its closing elements are arranged in the form of a sector, as can be seen especially in the cut section (FIGS. 2 and 3).

The fixed main and auxiliary contacts 9 are located inside a cylindrical cover 10 which is held to the cylindrical container by upper and lower fixing parts 11 or 12 for each phase. The upper and lower fixing part 11 or 12 is at the same time implemented as a radial guide plate for the movable contact 13 and includes a guide groove 14 for the auxiliary contact 9 and a slot 15 for the main contact 9 for this purpose. . The upper and lower fastening parts 11 or 12 are thus located relatively close to each other, which leads to a strong bond in the contact area, ie a greater mechanical strength. Furthermore, the upper and lower fixing parts 11, 12 can thus also be used for guiding the radial movement of the lever 16 for the contact movement carried out by the hollow shaft 17 in a known manner. As is clear from FIG. 1, the cylinder cover 10 seated on the fixing parts 11, 12 extends well beyond the lower fixing part 12 and at the same time the current limiting resistor 1
8 and furthermore forms a seating edge 19 for placing the insertion part 1 (FIG. 4). The one-phase current limiting resistor 18 forms a structural unit together with the corresponding cylindrical cover 10, as can be seen in particular from FIG. That is, when separating the cylindrical cover 10 from the upper and lower fixed parts 11 or 12, the connecting conductor between the current limiting resistor 18 and the fixed main and auxiliary contacts 9 arranged on the outer surface of the cylindrical cover. The current limiting resistor 18 can remain in this cylindrical cover without separating the parts 20, 21, 22. This makes it easier to remove the individual cylindrical covers during maintenance work. This is because there is no need to specially remove the current limiting resistor i, and therefore connection errors will not occur during reassembly. In this case, the individual current limiting resistors 18 can be inserted as such into the window-like recesses 23 of the respective cylindrical covers. That is, when the insertion part 1 is assembled in advance, the current limiting resistor can be assembled later. This is because all the connecting conductors are installed on the cylindrical surface and remain there during subsequent maintenance work and subsequent removal of the individual cylindrical cover. FIG. 4 shows, for example, on the left-hand side a current-limiting resistor that has already been inserted in connection with the associated contacts 9, 6 via connecting conductors 20, 21, 22, while on the right-hand side a current-limiting resistor that has not yet been inserted. The vessel 18 and the associated window-like cutout 23 are shown. As shown in FIG. 4, the outer surface of each cylindrical cover is provided with a raised part 24 whose height corresponds at least to the coupling screw 25 and the connecting conductors 20, 21, 22, and which connects the insertion part 1 to the insulating cylinder 3. When making Hesslad,
The connecting conductors 20, 21, 22 and the connecting screw 25 do not hit the upper edge (not shown) of the oil container 2.

The recesses 26 and the boreholes 27, which can also be seen in FIG. 4, serve for the assembly of the further contacts and the fastening of the cylindrical cover to the fixing parts 11 and 12. The lower cutout 28, on the other hand, is provided for a spark gap device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a switching switch according to the invention, FIGS. 2 and 3 are sectional views, respectively, and FIG. 4 is a general view of a single cylindrical cover.

Claims (1)

[Claims] 1 fixed main and auxiliary contacts housed in a cylindrical oil container and arranged in a sector for the individual phases of the transformer are arranged in a second same cylindrical container arranged in said oil container. A switching switch with a current limiting resistor for a tap changing device of a tap transformer, which is fixed adjacent to each other on the inside, the second cylindrical container comprising a cylindrical cover divided in the vertical direction,
The cylindrical cover is fixed to the lower and upper fixing parts at regular intervals so that an oil insulating section exists between the fixed contacts of adjacent phases, and is replaceable from the outside. In a switching switch with a current limiting resistor for a tap changer of a tap transformer, the fixed part is formed as a guide plate for a movable contact, the cylindrical cover 10 extends beyond the lower fixed part 12, At its lower end it forms a mounting edge 19, and each cylindrical cover has a one-phase current limiting resistor 1.
8, said cover is formed as a carrier of the lower fixing part 1
2 has a window-like opening 23 on the lower side thereof, into which a pre-fabricated resistor pack 18 can be inserted from the outside, and the connecting leads 20, 21, 22 of this resistor are connected to the outer surface of the cylindrical cover. A load changeover switch that comes into contact with the contact point 6 and 9 and can be connected to contacts 6 and 9 from the outside.