JPH0414905Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a current collecting contact device for a tap changer, such as a tap selection switch or a tap selector used in a transformer.

[Conventional technology]

Figure 2 is a cross-sectional configuration diagram of a tap selection switch using a current collector contact device of a conventional tap changer.
FIG. 3 is a sectional view taken along the - line in FIG. 2. In the figure, reference numeral 1 denotes a fixed current collecting contact ring, which is held within an insulating holding cylinder 2 and connected to a tap p of a secondary winding 11 of the transformer. A movable current collecting contact 3 is rotatably supported by one movable holding frame 5 via a pin 4, and is in contact with the inner circumference of the fixed current collecting ring 1. 8 is an insulated drive shaft rotatably supported on the fixed side and rotated to a desired position by a rotation drive means; 6 is an insulated holder attached to this insulated drive shaft;
A pair of movable holding frames 5 are supported movably in the radial direction. Reference numeral 9 denotes a plurality of fixed current-carrying contacts installed at equal intervals within the insulation holding cylinder 2, each contact 9a, 9b...
...9m are respectively connected to taps a, b...l, m of the secondary winding 11 of the corresponding transformer. 1
0 is a movable current collecting contact rotatably supported by the other movable holding frame 5 via a pin 4, and is in contact with the fixed energizing contact 9, and is not electrically connected to the movable current collecting contact 3. ing.

FIG. 4 shows an enlarged sectional view of the current collecting contact device section (section A in FIG. 2). A compression spring 7 is attached to the insulating holder 6 and presses the movable holding frame 5 to press the movable current collecting contact 3 to the fixed current collecting ring 1.

In the above conventional device, the movable current collecting contact 3 rotatably held by the movable holding frame 5 is supported by the compression spring 7.
The movable current-carrying contact 10 is in pressure contact with the fixed current collecting ring 1, and the pressure-contact is maintained even when the movable current-carrying contact 10 moves to another adjacent fixed current-carrying contact 9, so that the movable current-carrying contact 10 is always in electrical contact.

[Problem that the invention attempts to solve]

In the conventional current collecting contact device of a tap changer as described above, the movable current collecting contact 3 may come into contact with the fixed current collecting ring 1 at one point, resulting in unstable contact due to the accuracy of processing and assembly of the component parts. It was hot. In addition, the fixed current collecting ring 1 has a square cross section, and there is a risk of a short circuit between the taps due to electric field concentration between the fixed current carrying contacts 9b to 9m outside the fixed current carrying contact 9a that is energized. Ta. In order to prevent this, the corners of the fixed current collector ring 1 are machined into arcuate surfaces, but the material yield is low and the machining is troublesome. Furthermore, the heat generated when the arc is interrupted due to energization or switching of contact between the movable current-carrying contact 10 and the fixed current-carrying contact 9,
The heat dissipation area of the fixed current collector ring 1 was small, resulting in a high temperature rise. In addition, the fixed current collector ring 1 is solid and heavy, making it difficult to handle during work and resulting in an increase in the weight of the product.

This idea was made to solve these problems.The fixed current collector ring is in stable contact with the movable current collector contact, which alleviates electric field concentration, reduces weight, and increases heat dissipation area. The aim is to obtain a fixed current collector for tap changers which is increased in size.

[Means for solving problems]

In the current collecting contact device for a tap changer according to this invention, the cross-sectional shape of the fixed current collecting ring is C-shaped with the inner circumferential side open, and both sides are formed into arcuate surfaces extending to the inner circumferential side. .

[Effect]

In this invention, the inner circumferential part of the fixed current collector ring has an arc shape on both sides, and the movable current collector contacts come into contact with the movable current collector contact at two places on each side, ensuring stable current conduction. Electric field concentration is alleviated.

[Example of idea]

FIG. 1 is a sectional view showing a current collector contact device for a tap changer according to an embodiment of this invention, and numerals 2 to 8 are the same as the conventional device. Fixed current collector ring 2
1 has a C-shaped cross section, the inner circumference side is open, both sides are formed into an arc of 180° or more toward the inner circumference, and the outer circumference is connected to the inside of the insulating holding cylinder 2. It is straight in the width direction so as to be in close contact with the circumference.

In the apparatus of the above embodiment, the movable current collecting contact 3 pressed by the compression spring 7 is moved to the fixed current collecting ring 2.
It is in contact with the arcuate surfaces on both sides of the inner circumference of the shaft 1, and as the insulated drive shaft 8 rotates, it rolls in stable contact at two locations on both sides.

In the above embodiment, a tap selection switch was used as the tap changer, but the present invention can also be applied to a tap selector.

[Effect of idea]

As described above, according to this invention, the fixed current collector ring has a C-shaped cross-section, the inner circumferential part is open, and both sides are arcuate surfaces extending over the inner circumferential part, thereby ensuring stable contact. Energization is obtained, electric field concentration is alleviated, heat dissipation area is increased, temperature rise is reduced, and weight is reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a current collecting contact device for a tap changer according to an embodiment of this invention, and Fig. 2 is a sectional view showing a configuration of a tap selection switch using a current collecting contact device for a conventional tap changer. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is an enlarged sectional view of section A showing the current collecting contact device of FIG. 2. 2... Insulation holding tube, 3... Movable current collector contact, 6
...Insulating holder, 8...Insulated drive shaft, 21... Fixed current collection ring. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fixed current collector ring held on the inner circumference of the insulating holding cylinder and connected to one of the taps of the transformer winding, and a fixed current collecting ring fixed to the insulated drive shaft. In a current collecting contact device for a tap changer, the current collecting contact device has a movable current collecting contact that is movably held in a radial direction by an insulating holder and rollably contacts an inner circumferential portion of the fixed current collecting ring. A current collecting contact for a tap changer, characterized in that the ring has a C-shaped cross-sectional shape, the opening is on the inner circumferential side, and the both sides in the width direction are formed into an arc shape extending to the inner circumferential side. Device. (2) Both sides of the fixed current collector ring extend 180° to the inner circumference.
A current collector contact device for a tap changer according to claim 1, characterized in that it is formed into the above circular arc.