JPH0322830Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a vacuum shield disconnector, in particular, it has a vacuum valve in the shield disconnection, and is connected to the panel side by a disconnection terminal connected to the vacuum valve. This article relates to a drawer-type vacuum shield and disconnector.

[Conventional technology]

Vacuum valves used in vacuum shields and disconnectors utilize their extremely high electrical dielectric strength in a vacuum and their remarkable arc-extinguishing effect when the shield is disconnected in a vacuum. The vacuum valve is designed to turn on and off the current inside the container, and such vacuum valves have also become significantly smaller with the advancement of technology in recent years.
There is a strong demand for the development of a vacuum shield and disconnector that uses such a small vacuum valve and is highly safe, compact, and inexpensive.

[The problem that the idea attempts to solve]

However, in conventional vacuum shields and disconnectors of this type, the terminals exposed to the outside on the fixed contact side and movable contact side of the vacuum valve are large, even though the vacuum valve has become smaller. In order to guarantee the rated current, it is necessary to maintain a large cooling area in anticipation of a cooling effect, which results in the formation of large exposed live parts. If heat is dissipated from a large exposed live part, it is not only difficult to miniaturize the vacuum shield or disconnector, but also the insulation safety is reduced.

Therefore, in order to improve insulation safety, it may be possible to cover the vacuum bulb and its exposed live parts with an insulating material, but such a measure would result in an increase in the temperature of this part. A method has been adopted in which the live parts are partially exposed. However, even with this type of system, safety problems still remain.

In view of the above-mentioned problems, the purpose of this invention is to house the connection part near the terminal of the vacuum valve in an insulating box, and to make the disconnection connection terminal connected to the external circuit an exposed live part so that it can easily dissipate heat. The object of the present invention is to provide a small-sized and highly safe vacuum shield and disconnector.

[Means to solve the problem]

In order to achieve such an object, the present invention has a plurality of vacuum valves in which disconnection connection terminals are vertically arranged, each of which is connected to a fixed contact and a movable contact via an intermediate conductor. In a vacuum disconnector where an electrical connection is made with an external circuit disconnection connection end, the vertical contact surfaces of the disconnection connection terminals facing each other are extended from the fixed part to form a roughly U-shape. The tip of the blade-shaped terminal is divided through a plurality of parallel slits, and has a protrusion facing inside the contact surface, and is brought into contact with the intermediate conductor. The present invention is characterized in that a fixing part to be fixed is housed in an opening of each insulating box housing the vacuum valve.

[Effect]

According to the present invention, a sufficient heat dissipation effect can be obtained by dividing the tip of the U-shaped elastic blade-shaped terminal with a plurality of slits, and the elasticity of the blade-shaped terminal The protruding parts on the inside of the contact surface can be offset from each other, and the fixed part can be fixed by coming into contact with the intermediate conductor, and the fixed part can be housed in the opening of each insulating box. In this way, the fixed parts can be separated from each other by the insulating box in an open state, and the correlation distance can be sufficiently shortened.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

Figures 1A and 1B show an outline of the vacuum breaker of the present invention, in which 1 is a pull-out type operation part of the breaker, 2 is a breaker section; A vacuum valve 3 is installed in an insulating box 5 surrounding the vacuum valve 3, and a disconnection terminal 4 connected to the vacuum valve 3 is provided on the opening side of the insulating box 5. Further, reference numeral 6 denotes an operating lever that transmits the operating force obtained from the operating section 1 to the sheath section 2.

Incidentally, since both the shingle breaker 2 and the disconnection connection terminal 4 are arranged in parallel according to the phases, it is necessary to appropriately set the distance d between the phases, but the shingle breaker should be made compact. It is desirable to shorten this phase-to-phase distance d as much as possible. Phase distance d
is the spatial distance d ₁ between adjacent connection terminals 4 and the connection terminal 4
_However , according to the present invention, the interphase distance d can be set sufficiently short for reasons described later.

2A, 2B and 2C show details of the edge section 2, where 5A and 5B are a support member and a vacuum valve mounting member integrally fixed to the insulating box 5. 3A is vacuum valve 3
This terminal 3A is firmly fixed to the valve mounting member 5B together with the intermediate conductor 7 with a mounting screw 8, and furthermore, the disconnection terminal 4 is fixed to the intermediate conductor 7 with a bolt 9.

3B is a movable contact rod of the vacuum valve 3, and the movable contact rod 3B and the insulating rod 10 are connected to the joint member 1.
0A, the movable contact rod 3B is operated via the insulating rod 10, and the vacuum valve 3
You can make them do things like give and take inside.

Further, one end of a flexible conductor 11 is fixed to the movable contact bar 3B, and the other end of the flexible conductor 11 is held between the support member 5A and the disconnection connection terminal 4 on this side, and is attached to a bolt 9. It is fixed by.

Note that the connection between the disconnection connection terminal 4 and the flexible conductor 11 on this side and the connection between the disconnection connection terminal 4 and the intermediate conductor 7 on the fixed contact 3A side are both closer to the edge 5C of the insulating box 5. It is set to be located inside the insulation box 5.

Furthermore, as shown in FIG. 2C, the terminal pieces 4A of the disconnection connection terminal 4 are formed of a substantially U-shaped plate material, and the mutually opposing tip portions 4 of the terminal pieces 4A
B has an arcuate inward curve, and a protrusion 4C is provided on the inside of the tip 4B so that a good contact state can be obtained with the fixed disconnection contact 20 on the panel side. be.

Furthermore, the terminal piece 4A is provided with slits 4D and 4E as shown in FIG. 2B from the free end to the tip 4B and the subsequent portion thereof,
A spring holding member 13 having a contact spring 12 is fixed at a predetermined position via the slit 4E, and the spring force of this spring 12 causes the tip portion 4 to be fixed.
The protruding portion 4C of B is brought into contact with the contact 20, and sufficient contact pressure is maintained therebetween.

In addition, in FIG. 2C, the protrusion 4 at the tip 4B
The holding distance W ₁ between C is generally set in relation to the plate thickness of the contact 20 on the panel side having a knife edge, but it is usually about 4 to 10 mm. In order to fix it to the side of the cross section 2, as shown in Fig. 2C, the fixing flange must have a sufficient space width W ₂ for tightening the bolt 9, and the width W 2 must be larger than the width W ₁ of the opening.
W ₂ has to become large.

However, according to the present invention, as shown in FIG. 3, the axial center position 9A of the bolt 9 is positioned at the center of the symmetrical upper and lower terminal pieces 4A separated by the slit 4E and the left and right terminal pieces 4A. There is. In addition, although FIG. 3 shows a state in which the contact spring 12 and the spring holding member 13 are installed between the terminal pieces 4A, these spring devices are attached to the terminal pieces 4A and the bolts 9 on the cut-off portion 2 side. It can be installed after it is fixed.

Therefore, when installing the bolt 9, when inserting a bolt tightening tool (not shown) into the head of the bolt 9 from the free end side of the terminal piece 4A, it is necessary to insert the bolt tightening tool (not shown) into the head of the bolt 9 from the free end side of the terminal piece _4A . virtual circle 3
Since it is possible to work with 0 as the limit, it is possible to reduce the space width W ₂ to correspond to the size of the virtual circle 30, and the outer dimension d ₂ of the connecting terminal 4 shown in FIG. 1B can be reduced sufficiently. Can be set small.

In particular, in this example, the slits 4D and 4E are provided to separate the terminal pieces 4A in the vertical direction, so that the tightening bolts 9 arranged above and below can be easily secured.

Furthermore, in this example, since the terminal pieces 4A are arranged vertically in the form of blades, air convection can be facilitated and the cooling effect of the exposed live parts can be enhanced.

Note that the flexible conductor 11 and the intermediate conductor 7, which form the electrical connection between the disconnection connection terminal 4 and the vacuum valve 3 side, are formed in a rectangular shape and are areas where electric field concentration is large. It is necessary to maintain a distance between the phases, but in this example, such a connection is configured to be housed in the insulating box 5, and the phases are isolated by the side wall of the insulating box 5. , it is not only possible to set the interphase distance d to be sufficiently short while maintaining the spatial distance d ₁ between the terminals 4, but also to increase the cooling effect by widening the width of the flexible conductor 11 and the intermediate conductor 7. You can do it like this.

[Effect of idea]

As explained above, according to the present invention, the terminal piece of the disconnection connection terminal that maintains contact with the panel side is formed of a double-edged U-shaped terminal board, and the direction of this terminal board is vertical. Since contact is maintained only on the sides of the plate, the contact resistance is reduced, which not only reduces the amount of heat generated, but also increases the cooling effect due to the convection effect.Furthermore, the connection part of the disconnection terminal with the vacuum valve is connected to the insulation box. Since it is surrounded by a wall, the connection part can be set large enough to provide cooling without the risk of interphase arcing, and the distance between the phases can be set sufficiently small, resulting in high insulation safety. , it can be made small and inexpensive, and it can also be used for a large rated current.

[Brief explanation of drawings]

Figures 1A and 1B are a side view and a top view, respectively, showing an outline of the vacuum shield breaker of the present invention as an example, Figure 2A is a front view showing details of the shield section, and Figure 2B is a Sectional view taken along line A-A in Figure 2.
Figure C is a partial sectional view taken from line B-B in Figure 2B,
FIG. 3 is a front view showing details of the disconnection connection terminal in FIG. 2B when viewed from direction C. DESCRIPTION OF SYMBOLS 1... Operation part, 2... Shrink section, 3... Vacuum valve, 3A... Fixed contact side terminal, 3B... Movable contact bar, 4... Disconnection connection terminal, 4A... Terminal piece, 4B...Tip, 4C...Protrusion, 4D, 4
E...Slit, 5...Insulation box, 5A...Supporting member, 5B...Mounting member, 5C...Edge, 6...
Operation lever, 7... Intermediate conductor, 8... Mounting screw, 9... Bolt, 9A... Center position, 10...
Insulating rod, 10A...Joint member, 11...Flexible conductor, 12...Spring, 13...Spring holding member, 2
0...Fixed disconnection contact, 30...Virtual circle.

Claims (1)

[Scope of utility model registration request] It has a plurality of vacuum valves in which disconnection connection terminals are vertically arranged, each connected to a fixed contact and a movable contact through an intermediate conductor, and electrical connection between the disconnection connection terminal and an external circuit disconnection connection end is provided. In the vacuum disconnector where the connection is made, the disconnection connection terminals are made into elastic blade-shaped terminals in which vertical contact surfaces facing each other extend from the fixed portions and are formed into a substantially U-shape; The tip of the blade-shaped terminal is divided through a plurality of parallel slits, and has a protruding portion facing inside the contact surface, and the fixing portion is fixed by contacting the intermediate conductor. A vacuum disconnector characterized in that the vacuum valve is housed in the opening of each insulating box housing the vacuum valve.