JPH0348814Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention has a contactor consisting of a plurality of contact fingers that slide into or out of contact with a contact portion.
This relates to power switching equipment such as power disconnectors.

[Technical background of the invention] In general, the contact part of a power switching device that has a current switching function, such as a circuit breaker, consists of a fixed electrode side and a movable electrode side, as shown in Figure 1. A fixed main contact 1 and a fixed arc contact 2 are provided, and a movable main contact 3 and a movable arc contact 4 are provided on the movable electrode side. By separating the current-carrying paths (between the arc contacts), wear and tear on the contacts is reduced. In power switching devices such as disconnectors that require high power energization and switching, one of the contact parts is equipped with multiple contact fingers because it can easily handle large capacity. Contacts are often used. That is, in the conventional example shown in FIG. 1, the fixed main contact 1 is formed of a plurality of contact fingers 1a arranged in a substantially cylindrical shape, and the inner surface thereof slides against the outer peripheral surface of the circular movable contact 3. It seems to be moving and moving towards and away from each other. This contact finger 1a
are individually pressurized by springs 5 one by one in order to reduce the resistance at the time of contact, and are in elastic contact with the movable contact 3 when turned on.

[Problems in the Background Art] By the way, the contact fingers 1a are slightly spaced to prevent "warping" from occurring due to variations in the fingers themselves or dimensions at the time of installation.
They are arranged with spaces between them. This gap becomes large as the number of contact fingers 1a increases, and there is a risk that the contact fingers 1a may fall or twist during repeated sliding and contact/separation, resulting in poor contact.

Therefore, conventionally, as shown in Fig. 2 A to C,
A finger guide 8 is fixed to the finger case 6 or the finger support 7 by welding or the like, and the finger guide 8 prevents the contact finger 1a from falling or twisting. and,
An electric field mitigation shield 9 provided on the tip end side of the contact finger 1a is fastened to the finger case 6 using bolts 10.

However, in such a structure, the finger guide 8 is connected to the finger case 6 or the finger support 7.
In order to fix the contact fingers 1a to Even support 7 needed to be replaced. In addition, since the bolt 10 that fastens the electric field mitigation shield 9 is provided at right angles to the sliding direction of the movable contact,
Another drawback was that shearing force was applied to the bolt 10, which was undesirable.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to be able to arrange contact fingers without performing any special processing on the finger case or finger support, and to It is an object of the present invention to provide a power switching device in which no shearing force is applied to a fixing bolt of an electric field mitigation shield when a contactor slides or connects or separates.

[Summary of the invention] The power switchgear of the invention is provided with a spacer piece for each appropriate number of contact fingers to prevent them from collapsing or twisting, and this spacer piece and an electric field mitigation shield provided at the tip of the finger case. , which has a structure in which the finger support is tightened and fixed with bolts provided along the sliding direction of the contact, and by fixing the spacer piece using the fastening bolt of the electric field mitigation shield, the finger case can be fixed. This eliminates the need for processing to attach the contact finger to the contact finger support, and by providing the fixing bolt of the electric field mitigation shield along the sliding direction of the contact, no shearing force is applied to the bolt. It is something.

[Embodiment of the invention] An embodiment of the invention will be specifically described below with reference to FIGS. 3A to 3C. Note that parts that are the same as those of the conventional power switchgear shown in FIG. 2 are designated by the same reference numerals, and description thereof will be omitted.

In this embodiment, the fixed main contact 1 has a plurality of contact fingers 1a arranged at predetermined intervals along its circumferential direction. The base of the contact finger 1a includes a cylindrical finger support 7 provided at the tip of the fixed main contact 1;
It is assembled in the space between it and a ring-shaped finger case 6 fitted on its outer periphery.

Between the plurality of contact fingers 1a provided on the fixed main contactor 1 in this manner, spacer pieces 11 are provided for each appropriate number of contact fingers 1a. This spacing piece 11 is provided on the side of the base of the contact finger 1a, and restricts the lateral movement of the contact finger 1a and prevents it from falling or twisting. Further, the spacing piece 11 is incorporated between the outer circumferential surface of the finger support 7 and the inner circumferential surface of the finger case 6, and supports the finger case 6 on the outer circumference of the finger support 7.

The distal end of the spacing piece 11 extends close to the distal end of the finger case 6, and the distal end of the finger case 6 and the spacing piece 11 include:
A shield 9 for mitigating the electric field is arranged. This electric field mitigation shield 9 is fastened and fixed to the tip of a bolt 10 provided on the finger support 7 along the sliding direction of the contact. That is, this bolt 1
0 passes through an insertion hole 11a provided in the spacing piece 11 and is screwed into a screw hole 9a of the electric field mitigation shield 9, and this bolt 10 connects the spacing piece 11, the electric field mitigation shield 9, and A finger case 6 sandwiched between the electric field mitigation shield 9 and the finger support 7 is fixed integrally.

As mentioned above, in the power switchgear of this embodiment, the spacer piece for preventing the contact finger from falling down or twisting is fixed by the fixing bolt 10 of the electric field mitigation shield, so the finger support and the finger There is no need to perform special processing to fix the finger guide to the case, making it possible to simplify the structure of the contact part and reduce the number of manufacturing steps. In particular, since there is no need for special processing on the finger case or finger support,
The number of contact fingers can be easily changed by simply changing the position of the spacer piece 11, and changes in current capacity can be easily accommodated. In addition, by passing the bolt that fastens the shield through the insertion hole provided in the spacing piece, it is possible to directly fix the electric field mitigation shield to the finger support, and the finger case can be attached to the finger support as in the past. Compared to a fixed device with an electric field mitigation shield attached thereto, fewer bolts need to be tightened, and the positioning of the electric field mitigation shield becomes more accurate, improving the reliability of the device. Furthermore, since the tightening bolt is provided along the sliding direction of the contact, no shearing force is applied to the bolt when the contact slides, improving tightening reliability and ensuring long-term use. becomes tolerable.

Although the illustrated embodiment is an application of the present invention to a fixed main contact, it is also possible to apply the present invention to movable main contacts or switching equipment in which the contacts simply slide. It is.

[Effects of the invention] As described above, according to the invention, the electric field mitigation shield and the spacing piece can be fixed at the same time by simply passing the tightening bolt of the electric field mitigation shield through the spacer piece. , it is possible to provide power switching equipment with a simple structure and high reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of the contact portion of a puffer type gas shield disconnector which is an embodiment of the present invention, with the upper half showing the closed state and the lower half showing the pulled out state. 2A to 2C show the structure of a contact part in a conventional power switching device, and FIGS. 3A to 3C show the structure of a contact part in an embodiment of the present invention. and FIG. 3A are sectional views taken along the line a-a in FIG. 1, FIG. 2B and FIG. 3B are sectional views taken along the b-b line in FIGS. and FIG. 3C are cross-sectional views taken along line c--c in FIGS. 2A and 3A, respectively. 1... Fixed main contact, 1a... Contact finger, 2... Fixed arc contact, 3... Movable main contact, 4... Movable arc contact, 5... Spring, 6... Finger Case, 7... Finger support, 8... Finger guide, 9... Shield for electric field relaxation, 9a... Screw hole, 10... Bolt, 11... Spacing piece, 11a... Insertion hole.

Claims (1)

[Scope of utility model registration request] A contact is constructed by arranging a plurality of contact fingers at predetermined intervals around the outer periphery of a cylindrical finger support, and a spacing piece is provided for each appropriate number of contact fingers, and the finger support is provided with a spacer in the direction of movement of the contact. A bolt provided along the line is passed through the insertion hole provided in this spacing piece, and the tip of this bolt is fastened to the electric field mitigation shield placed on the tip side of the contact finger. A power switchgear characterized by having one piece fixed to a finger support.