JPS6319966B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum shear breaker that improves the shearing performance by applying a magnetic field parallel to the arc generated during the shearing. .

Conventionally, many vacuum shield breakers have been proposed that aim to improve the shearing performance by applying a magnetic field in the same direction as the arc (so-called longitudinal magnetic field) to the arc that occurs between a pair of contacts when the shearing occurs. However, this type of vacuum interrupter generally has a coil for generating a magnetic field attached to the vacuum interrupter, which serves as the opening/closing part. They can be divided into two types: those with a coil inside the vacuum container as shown in FIG. 1, and those with a coil outside the vacuum container as shown in FIG.

That is, the vacuum interrupter 1 shown in FIG. 1 includes a pair of lead rods 2a and 2b that hermetically penetrate through a vacuum container 10 comprising an insulator 11, and a high resistance wire is attached to the inner end of each of the lead rods 2a and 2b. It is provided with contacts 3a and 3b via the body 21, and the lead rod 2
a, 2b and the contacts 3a, 3b, a coil electrode 4 that converts the current into a loop current surrounding the lead rods 2a, 2b to generate a magnetic field parallel to the arc;
a and 4b, and furthermore, at least one lead rod 2b has a bellows 22 between it and the vacuum container 10 so that it can move in the axial direction (vertical direction in the figure).

The vacuum interrupter 1 configured as described above is housed in an insulating frame (not shown), and has a terminal at the outer end of each lead rod 2a, 2b that can be freely connected to and separated from a main circuit conductor (not shown). The lead-out conductors 5a and 5b each having a section 51 at one end are connected to each other, and an operating device (not shown) is further attached to form a required vacuum shield and disconnector. Note that 9a and 9b connected to the terminal portion 51 are main circuit conductors.

By the way, the vacuum interrupter constructed as shown in FIG. 1 described above had the following drawbacks.

Since the coil electrodes 4a and 4b are located inside the vacuum vessel 10, when the coil generates heat due to current flow, this heat is difficult to dissipate to the outside. was inappropriate.

Contacts 3a, 3 are provided at the tips of the lead rods 2a, 2b.
b. Since a plurality of members such as the coil electrodes 4a, 4b and the high-resistance element 21 are integrally connected by brazing, the number of parts and processing steps are large, and the number of brazed parts is large. It had poor durability.

Therefore, especially in the case of a vacuum interrupter 1 with a large capacity (for high voltage or large current), the contacts 3a, 3
Since the coil electrodes 4a and 4b are large and heavy, the impact during operation is large and the durability is significantly reduced.

The coil electrodes 4a, 4b have respective contacts 3a, 3b.
Because it is located on the back of the coil electrodes 4a and 4b, when one lead rod 2b moves (moves downward in the figure) during a shear break, the pair of coil electrodes 4a, 4b
The gap will widen. As a result, as the distance between the contacts increases, the magnetic field gradually attenuates, causing the problem that the diffused arc becomes concentrated due to the attenuation of the magnetic field, which adversely affects the cutting performance.

From the above, in the vacuum interrupter 1 configured by providing coil electrodes 4a and 4b that generate a vertical magnetic field as shown in FIG. 1 within the vacuum vessel 10 and behind the contacts 3a and 3b, It has become clear that there is a natural limit to the improvement of shearing performance, and that although it is suitable for relatively low-capacity products, it is not suitable for high-capacity products.

For these reasons, for large-capacity vacuum interrupters, the vacuum interrupter shown in Fig. 2, which has been proposed earlier than the vacuum interrupter shown in Fig. 1, has historically been proposed. The technology of a vacuum interrupter in which a vacuum interrupter is disposed outside the vacuum vessel 10 has been reviewed. Next, the vacuum interrupter shown in FIG. 2 will be explained, but parts equivalent to those in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

That is, only contacts 3a and 3b are provided at the inner ends of the lead rods 2a and 2b, respectively. A coil conductor 4 that generates a vertical magnetic field is wound around the outer periphery of the vacuum container 10, and one winding end of the coil conductor 4 is connected to the fixed lead rod 2a via a connecting lead 6a. It is connected to the outer end, and the other winding end is connected to the lead-out conductor 5a via the connection lead 6b.
It is configured by connecting to. The vacuum interrupter 1 thus constructed is housed in an insulating frame (not shown) to construct a required vacuum interrupter and disconnector.

By the way, in the case of the vacuum interrupter 1 as shown in FIG. 2, since the coil conductor 4 is provided outside the vacuum vessel 10, even if the coil conductor 4 generates heat, it will not have an adverse effect on the contacts 3a, 3b, etc. No, since the coil conductor 4 is fixed, even if the gap between the pair of contacts 3a and 3b widens during the break, the magnetic field applied to the arc does not attenuate and remains constant. The structure is simple, as it is only necessary to provide contacts 3a and 3b at the inner ends of the lead rods 2a and 2b. There are various advantages such as:

However, in the conventional vacuum interrupter 1 of this type, the coil conductor 4 is insulated and integrally combined (for example, molded) on the outside of the vacuum vessel 10, so that the coil conductor 4 is not included. The external size of the vacuum interrupter 1 becomes considerably large, and the insulating frame that houses and holds the vacuum interrupter 1 also becomes correspondingly large, resulting in a problem that the disconnector becomes large in size.

Further, connection leads 6a and 6b connecting the coil conductor 4, lead rod 2a and lead conductor 5a are
Since the coil conductor 4 was formed by simply extending the winding end of the elementary conductor, the work of individually connecting the connecting leads 6a and 6b to the lead rod 2a and the lead-out conductor 5a was extremely complicated. I had a lot of flaws.

The present invention has been made in view of the above points, and the lead-out conductor connected to the outer end of the lead rod of a vacuum interrupter is provided with a terminal portion, a connecting portion, and a spacer that electrically separates the two. Constructed integrally,
On the other hand, the coil conductor is buried in a cylindrical insulating frame that holds and fixes the vacuum interrupter and the lead-out conductor.
A vacuum shear breaker which aims to further improve the shear breaker performance by separately connecting both winding ends of the coil conductor to a terminal portion and a connection portion of the lead-out conductor through connection leads. It provides equipment.

Next, an embodiment of the present invention will be explained based on FIGS. 3 to 10. In these figures, the same reference numerals as in FIGS. 1 and 2 above indicate products equivalent to these. Therefore, a detailed explanation of these will be omitted.

First, FIG. 3 is a sectional side view of the main part of the vacuum shield disconnector, showing the configuration for one phase. A pair of lead rods 2a and 2b that hermetically penetrate the vacuum container 10
Contact points 3a and 3b are respectively provided at the inner end of the
The vacuum interrupter 1 is configured such that one lead rod 2a (upper side in the figure) is fixed, and the other lead rod 2b (lower side in the figure) is movable via a bellows 22. , this vacuum interrupter 1 includes an insulating frame 8 formed in a substantially cylindrical shape.
It is housed inside with a space provided therein and is held and fixed to this insulating frame 8 via a pair of lead-out conductors 5a and 5b.

That is, one lead-out conductor 5a is fixed to the upper end of the insulating frame 8, and the lead rod 2a on the fixed side of the vacuum interrupter 1 is connected to the connection part 52 on one end side (right side in the figure) of the lead-out conductor 5a. Connections have been fixed. The other lead conductor 5b is fixed to the intermediate portion of the insulating frame 8, and the movable lead rod 2b of the vacuum interrupter 1 is movably connected to a ring contact 53 provided at the connecting portion 52 of the lead conductor 5b. (freely in the vertical direction in the figure).

The pair of lead-out conductors 5a, 5b are both provided extending in the same direction (to the left in FIG. 3), and are provided at the tip of the terminal portion 51, which is the left end side of each lead-out conductor 5a, 5b. are each fitted with a contact 54 so as to be able to engage and come into contact with the ends of the main circuit conductors 9a and 9b.

The terminal portion 51 and connecting portion 52 of the lead-out conductor 5b located on the lower side are integrally uniaxially formed of a highly conductive material such as copper material. On the other hand, the lead-out conductor 5a located on the upper side has a terminal portion 51 and a connecting portion 52 made of a highly conductive material such as copper material, as shown in FIGS. Both are integrally connected by a spacer 7 that electrically separates them.
Further, in a portion buried in the insulating frame 8 (details will be described later based on FIGS. 8 to 10) and surrounding the vacuum interrupter 1 (particularly the portion of the pair of contacts 3a and 3b), there is a fourth portion to be described later. A coil conductor 4 as shown in the figure is arranged. One end of the connection leads 6a and 6b is fixed to the coil conductor 4, and the other end (upper end in the figure) is connected to a lead-out conductor 5.
a Connected and configured.

In addition, in FIG. 3, 91 indicates the insulating frame 8.
It is a stand frame on which is erected, and has an operating device (not shown) built therein. Reference numeral 92 denotes an operating rod, whose upper end is connected to the movable lead rod 2b of the vacuum interrupter 1, and whose lower end is movably connected to an operating device (not shown) within the gantry frame 91. 93 is a surface plate erected on the stand frame 91.

The coil conductor 4 is constructed as shown in FIG. That is, a rectangular conductor 40 made of a copper material, for example, and having end portions 41 and 42 is wound in a flat direction to form a substantially ring shape, and a solder is further provided near the end portions 41 and 42 and on the outer circumferential side. A pair of connection leads 6a, 6 fixed by attaching etc.
b. The pair of connection leads 6a, 6b are made of, for example, a round bar-shaped copper material, and a notch 61 is provided at one end (bottom end in the figure) of the connection leads 6a, 6b, so that the joint surface with the conductor 40 is large. It is made so that.

Further, one of the lead-out conductors 5a is constructed as shown in FIGS. 5 to 7. That is, it is composed of a terminal portion 51 made of a rectangular rod-shaped body, a connecting portion 52 made of a rectangular plate, and a spacer 7 that connects both together and electrically separates them. These terminal portions 51 and connection portions 52 are
Both are made of a highly conductive material (eg copper), while the spacer 7 is made of an insulating material (eg plastic or alumina ceramics) or a high resistance metal (eg stainless steel or Inconel alloy). A rectangular notch 521 is provided on one side of the connecting portion 52.
The end portion 511 of the terminal portion 51 is fitted into the notch 521 via the U-shaped spacer 7, and the three members are integrated.

In addition, a stepped hole 512 is provided at the end 511 of the terminal portion 51.
An elastic contactor 62 (for example, a ring contact or a multi-contact) is attached and fixed thereto, and the tip of the connection lead 6a of the coil conductor 4 (in FIG. (upper end) is inserted and joined.
On the other hand, the connecting portion 52 is provided with a protrusion 522 having a stepped hole 523, and an elastic contact 63 is fixedly attached to the stepped hole 523 at the tip of the other connecting lead 6b of the coil conductor 4. are inserted and joined together. In addition, this connection part 52 has
A protrusion 524 is provided to which the lead rod 2a on the fixed side of the vacuum interrupter 1 is connected. Further, the connecting portion 52 is provided with a through hole 525 through which a mounting bolt is inserted when the connecting portion 52, that is, the lead-out conductor 5a is attached and fixed to the upper end portion of the insulating frame 8.

In FIG. 5, the arrows indicate the flow of the current I. The current flows from the terminal portion 51 of the extraction conductor 5a to the connection lead 6a, flows through the coil conductor 4 in a loop shape, flows to the connection lead 6b, and then flows to the connection lead 6b. It flows to the fixed side lead rod 2a of the vacuum interrupter 1 via the connection part 52.

Note that the lead-out conductors 5a and 5b have their terminal portions 51
It is not necessary to provide a contact 54 at the end of the main circuit conductor 9.
The terminal portions 51 provided on the a and 9b sides may be left in a rectangular state.

In addition, the terminal portion 51 and the connecting portion 52 of the lead-out conductor 5a
The connection between the connector and the connection leads 6a and 6b is not limited to the case where the elastic contacts 62 and 63 are interposed, but may be connected by bolts or nuts.

Next, while referring to Figure 3, Figures 8 to 10
The configuration of the insulating frame 8 and the embedded configuration of the coil conductor 4 will be explained in detail based on the drawings.

That is, the insulating frame 8 has a movable lead rod 2b provided in the vacuum interrupter 1 approximately in the center thereof.
The partition wall 82 is provided with a through hole 81 through which the lead conductor 5b is attached, and the partition wall 82 is provided with a through hole 81 through which the conductor is inserted.
A cylindrical cavity 83 capable of housing the vacuum interrupter 1 is provided on the upper side, and a drawer conductor 5b is provided on the lower side.
It is formed into a substantially cylindrical shape and includes a cavity 84 in which the operating rod 92 can be accommodated.

A ring-shaped groove 86 is provided concentrically with the cavity 83 and provided with a partition wall 85 having a predetermined thickness, in which the coil conductor 4 can be buried.

As is clear from FIG. 9, which is a plan view of the insulating frame 8, this groove 86 is formed in the shape of a partially divided ring, and the divided ring tips 86a and 86b are It is a concave groove that is larger than other parts. The connection leads 6a, 6b of the coil conductor 4 are inserted into the ring tip portions 86a, 86b.

As shown in FIG. 10, the coil conductor 4 is housed and buried in the groove 86 of the insulating frame 8, and the tips of the connection leads 6a and 6b are connected to the insulating frame 8.
The groove 8 is arranged to protrude from the upper end surface 87 by a predetermined dimension, and is further provided with a groove 8 for stably fixing the coil conductor 4.
6 contains an insulator 8a (for example, polyurethane rubber,
A cast liquid rubber such as polybutadiene rubber or silicone rubber) is filled and solidified.

Further, an opening is provided in the upper end surface 87 of the insulating frame 8,
An insert fitting 88 having a screw hole is provided, into which a fixing bolt is screwed when attaching and fixing the connecting portion of the drawer conductor 5a.

Note that the relationship between the groove 86 provided in the insulating frame 8 and the coil conductor 4 buried in this groove 86 is not limited to the above-mentioned embodiment, but may be configured as shown below. be.

Although it is desirable to fill the groove 86 with the insulator 8a, it is not necessary to fill the insulator 8a as long as the coil conductor 4 can be secured.

The concave groove 86 is not limited to a ring shape that is divided at one place, but may be a continuous ring shape.

Output conductor 5a, coil conductor 4, insulating frame 8, and vacuum interrupter 1 configured as described above
To explain an example of the assembly work of (fixed side lead rod 2a), first, the protrusion 524 at the connection part 52 of the drawer conductor 5a and the fixed side lead rod 2a of the vacuum interrupter 1 are connected with a mounting bolt, and one The coil conductor 4 is embedded in the insulating frame 8 as shown in FIG. 10, for example. In this state, the vacuum interrupter 1 is inserted into the empty space 83 of the insulating frame 8, and the ends (upper ends ), and then the connecting portion 52 of the lead-out conductor 5a is brought into contact with the upper end surface 87 of the insulating frame 8 and passed through the through hole 525 of the connecting portion 52, and is screwed into the insert fitting 88 provided in the insulating frame 8. They are assembled and connected to each other by fitting them together and providing fixing bolts.

In addition, although the embodiment in the above description describes the configuration in which the coil conductor 4 is connected to one (upper) lead-out conductor 5a, the present invention is not limited to this, and the present invention is not limited to this. Even when the coil conductor 4 is connected, or when the coil conductor 4 is provided in two places and connected to the lead-out conductors 5a and 5b, the same effect can be achieved by forming the insulating frame 8 and groove 86 correspondingly. It can be implemented in

As is clear from the above description, the present invention has various effects as described below.

A vacuum interrupter 1 and a coil conductor 4 are constructed separately, and the vacuum interrupter 1 is fixedly installed in an insulating frame 8 via lead-out conductors 5a and 5b, while the coil conductor 4 is embedded in an insulating frame 8. Since the vacuum interrupter 1 of the vertical magnetic field application type is constructed only by connecting the lead-out conductor 5a, (or 5b) and the coil conductor 4, the vacuum interrupter 1 is , coil electrodes 4a, 4b inside (see Figure 1), or coil conductor 4 outside (second
(See figure) Compared to a vertical magnetic field application type vacuum interrupter that is directly equipped with this kind of vertical magnetic field application type vacuum interrupter to configure a vertical magnetic field application type vacuum interrupter, the configuration of the vacuum interrupter 1 itself is This makes it possible to obtain a vacuum chamber and disconnector that is extremely simple, inexpensive, and has good assembly workability.

The lead conductors 5a and 5b connected to the lead rods 2a and 2b of the vacuum interrupter 1 are connected to the terminal portion 51.
, a connecting portion 52 , and a spacer 7 that electrically separates the two, which are integrally connected, so that the winding direction of the coil conductor 4 fixedly provided outside the vacuum interrupter 1 is fixed. By separately connecting both ends to the terminal portion 51 and the connection portion 52, a vacuum shield or disconnector that can apply a vertical magnetic field can be easily constructed.Moreover, since the coil conductor 4 is fixed, it is easy to use. A pair of contacts 3 when disconnected
Even if the gap between a and 3b widens, there is no attenuation of the magnetic field, and the shearing performance can be improved.

The lead-out conductors 5a and 5b connect the terminal portion 51 and the connecting portion 52 in a uniaxial (linear) manner via the spacer 7.
Compared to conventional lead-out conductors, it is not so large, maximal, or complicated, and does not require large vacuum shields, disconnectors, or devices such as switchboards. There is no introduction.

The coil conductor 4 is integrally provided with connection leads 6a and 6b at both ends in the winding direction.
Since the coil conductor 4 is buried in the insulating frame 8, there is no need to perform special insulation treatment for the coil conductor 4, and the coil conductor 4 is later buried in the groove 86 formed in the insulating frame 8. Therefore, there is no problem of cracks that tend to occur in cast insulators containing metal bodies of complex shapes, and it is possible to obtain a highly reliable and durable vacuum shield or disconnector.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of a conventional vacuum interrupter, FIG. 3 is a sectional side view of essential parts of a vacuum interrupter according to an embodiment of the present invention, and FIG.
The perspective view of the coil conductor in the figure, FIG.
FIGS. 6 and 7 are a plan view and a cross-sectional view of the main parts of FIG. 5, and FIGS. 8 and 9 are the insulating frame shown in FIG. 3. A cross-sectional perspective view and a plan view of the main parts,
FIG. 10 is a cross-sectional perspective view of a main part of the insulating frame and the coil conductor in a combined state. 1 is a vacuum interrupter, 10 is a vacuum container, 2
a and 2b are lead rods, 3a and 3b are contacts, 4 is a coil conductor, 5a and 5b are lead-out conductors, 51 is a terminal portion, 52 is a connection portion, 6a and 6b are connection leads, 7
is a spacer, 8 is an insulating frame, and 9a and 9b are main circuit conductors.

Claims (1)

[Claims] 1 A pair of opposing lead rods 2a, 2 that hermetically penetrate the vacuum container 10 and can move toward and away from each other.
a vacuum interrupter 1 comprising contacts 3a and 3b at the inner ends of the lead rods 2a and 2b, respectively connected to the outer ends of the pair of lead rods 2a and 2b included in the vacuum interrupter 1; A pair of lead-out conductors 5a, 5b which are provided as a main circuit conductor 9a, 9b and can be freely connected to and separated from the main circuit conductors 9a, 9b, an insulating frame holding the vacuum interrupter 1 and the lead-out conductors 5a, 5b, and a vacuum container 10 of the vacuum interrupter 1. In the vacuum shield breaker, the insulating frame has a substantially cylindrical shape and a coil conductor 4 which is wound around the outer periphery of the insulating frame and which generates a magnetic field parallel to the arc generated between the pair of contacts 3a and 3b. The coil conductor 4 is formed and provided in an insulating frame 8, and at least one coil conductor 4 is embedded in the insulating frame 8,
At least one of the pair of lead-out conductors 5a, 5b is connected to the main circuit conductor 9a, 9b.
a terminal portion 51 that can be connected to the terminal portion 51, and a connecting portion 5 to which the lead rods 2a, 2b of the vacuum interrupter 1 are connected.
2 and a spacer 7 that electrically separates both of them, one end side of the connection leads 6a, 6b is connected to both ends of the coil conductor 4, respectively, and the other end side is connected to the lead-out conductor 5a. , 5b terminal part 5
1 and a connecting portion 52, and the connecting leads 6a and 6b are embedded in an insulating frame 8.