JPS59143228A - Vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker that improves circuit breaker performance by applying a magnetic field parallel to the arc generated during circuit breaker. Many vacuum circuit breakers have been proposed that aim to improve circuit breaking 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, but this persimmon vacuum circuit breaker Generally, a vacuum interrupter, which serves as an opening/closing part, is equipped with a coil for generating a magnetic field.Vacuum interrupters can be roughly divided into 9 types as shown in Figure 1. There are two types: those with a coil inside the vacuum container and those with a coil outside the vacuum container as shown in FIG.

That is, the vacuum interrupter 1 in FIG.
Airtightly in a vacuum container 10 comprising! Place the pair of lead rods 2a and 2b that have passed through the
Contacts 3a and 3b are connected to the inner ends of the
and coil electrodes 4a and 4a located between the lead rods 2a, 2b and the contacts 3a, 3b to convert the current into a loop current surrounding the lead rods 2a, 2b to generate a magnetic field parallel to the arc. 4b, and at least one lead rod 2b has a bellows 22 between it and the vacuum container 10 so as to be movable in the axial direction (vertical direction in the figure).

The vacuum interrupter 1 configured as described above is
The lead rods 2a and 2b are housed in an absolute f#7 frame (not shown), and each lead rod 2a, 2b is provided with a terminal part 5 at one end that can be freely connected to and separated from the main circuit conductor (not shown). lead-out conductor 5
a and 5b are connected to each other, and an operating device (not shown) is attached to form a vacuum breaker. Note that 9a, 9 connected to the terminal portion 51
b is the main circuit conductor.

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

■ Since the coil electrodes 4a and 4b are located inside the vacuum vessel 10, they have the disadvantage that when the coil generates heat due to current flow, it is difficult for this heat to be dissipated to the outside. It was inappropriate.

(2) Contacts 3a, 3b at the tips of lead rods 2a, 2b
.

Since a plurality of members such as the coil electrodes 4a and 4b and the high-resistance element 21 are integrally joined by brazing, the number of parts and processing steps are large, and the number of parts for brazing is large, resulting in poor durability. was bad.

Therefore, especially in the case of a vacuum interface 1 with a large capacity (for high voltage or large current), the contacts 3a, 3b and the coil electrodes 4a, 41) are large in size and 1" in size, so there is a risk of shock or dog damage during operation. However, the durability of the blade decreased significantly.

(8) The coil' electrodes 4a and 4'b are connected to each contact 3a.
, because it is located at the back of a'b,
- When one of the mounting rods 2b moves (moves 1541t4 downward +8+), the pair of coil electrodes 4a, 4
'b1111 will spread. As a result, contact IHI
As the magnetic field increases, the magnetic field gradually attenuates, causing the diffused arc to become concentrated and ignite due to the attenuation of the magnetic field, which adversely affects the breaking performance.

From the above, the coil electrodes 4a and 4b that generate the 9-hole vertical i+ fertile field shown in FIG.
The vacuum interrupter 1, which is configured to be installed inside the O and behind the contacts 3a and 3b, has a natural limit to improving the interrupting performance, and although it is suitable for relatively low-capacity devices, it is not suitable for high-capacity devices. I've come to realize that it's not suitable for me.

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 true 9 interrupter technology is arranged outside the vacuum vessel 10! Next, the vacuum interrupter shown in FIG. 2 will be explained, but the same reference numerals will be given to the same parts as in FIG. 1, and detailed explanation thereof will be omitted.

In other words, there are contacts 3 at the inner ends of the lead rods 2a and 2'b.
Only a, 3'b are provided. Also, on the outer periphery of the vacuum container, there is a coil conductor 4 that generates a vertical magnetic field.
One winding end of this coil conductor 4 is connected to the outer end of the lead rod 2a of IJll through a connecting lead 6a, and the winding end of the coil conductor 4 is connected to the outer end of the lead rod 2a of 1μm1
is tangent μ2. 4e f to the drawer conductor 5a via the lead 6b
It is composed of A', l, and. The interrupter 1'f, constructed in this way, is housed in a resuscitation frame (not shown) to provide the required vacuum breaker force.

By the way, in the vacuum interrupter 1 as shown in Figure 1@2, (1) the coil conductor 4 is provided outside the vacuum vessel 10, so even if the coil conductor 4 generates heat, the contact 3a
, 3b, etc., without any negative impact. (2) Since the coil conductor 4 is fixed, the pair of contacts 3a
, 3b widens, the magnetic field applied to the arc does not attenuate and remains constant. (8) The structure is simple, since only the contacts 3a and 3b need be provided at the inner ends of the lead rods 2a and 2'b. There are various advantages such as:

However, in the conventional vacuum interrupter 1 of this type, the coil conductor 4 is treated with P wire, and the vacuum vessel IO
Since the vacuum interrupter 1 is integrally bonded (for example, by molding) to the outside of the vacuum interrupter 1, the external shape of the vacuum interrupter 1 including the coil conductor 4 is considerably large. , connection leads 6a and 6b connecting the lead rod 2a and the lead conductor 5a are as follows:
Since the coil conductor 4 was formed by extending the winding end of the elementary conductor to the trench, these connecting leads 5a,
6t)k There was a drawback that the work of individually connecting each lead rod 2a and lead-out conductor 5a was very complicated.

The present invention has been made in view of the above points, and includes fi,
, The lead-out conductor that can be connected to the outer end of the lead rod of the %9 interrupter is integrally composed of the terminal part, the connecting part, and a spacer that electrically separates both, while the coil conductor is connected to the vacuum interrupter and It is embedded in a cylindrical insulating frame that holds and fixes the lead-out conductor, and the ends of both windings of the coil conductor are connected separately to the terminal part and the connecting part of the lead-out conductor via connection leads. The purpose of the present invention is to provide a vacuum breaker whose breaking performance is improved by a factor of 11.

Next, an embodiment of the present invention will be explained based on FIGS. 3 to 9. In these figures, the above-mentioned FIGS.
Items with the same reference numerals as those in the figures indicate equivalent products, and detailed explanations thereof will be omitted.

First, FIG. 3 is a cross-sectional side view of the main part of the vacuum breaker,
- Shows the composition of the phase components. 1! , a pair of lead rods 2a, 2b that airtightly penetrate the empty container 10 are provided with contacts 3a, 3b at their inner ends, respectively. A lead rod 2b (lower side in the figure) is configured to be movable via a bellows 22 to constitute a JU vacuum interrupter 1. A pair of lead-out conductors 5a are provided for storage and a pair of lead-out conductors 5a.

5 i) %-17 lever held in insulating frame 8 1e
・It is fixed at 1.

That is, one of the lead-out conductors 5a is fixed to the upper end of the insulating frame 8, and one end side of the lead-out conductor 5a (ring contact 53 to the connection part 5z, which is cloth (lIl+) in the figure), and the spacer. The fixed-side glue rod 2a of the vacuum interrogator 1 is connected and fixed in contact with the connection leads 6a and 6b with the intervening wires 60 interposed therebetween.

The other lead conductor 5b is fixed to the bottom of the insulating frame 8, and the lead rod on the movable side of the vacuum interrupter 1 is movably connected to the ring contact 53 provided at the connection part 52 of the lead conductor 5b. It is inserted through it (freely in the vertical direction in the figure).

The pair of lead-out conductors 5a and 5b are both provided extending in the same direction (to the left in FIG. 3), and the tip portion of the terminal portion 51 is the left end 4111+1 of each lead-out conductor 5a and 5b. A contact 54 is attached to each of the main circuit conductors 9a and 9b so that the contacts 54 can come into contact with the ends of the main circuit conductors 9a and 9b (releasably detachable). The lead-out conductor 5b has a terminal portion 51 and a connecting portion 52 in one piece, for example, Ui.
It is made of a highly conductive material such as iI material.

Further, in a portion embedded in the insulating frame 8 (details will be described later based on FIG. 5) and surrounding the true 9 interrogator 1 (particularly the portion of the pair of contacts 3a and 3b), as shown in FIG. 4 described later. A coil conductor 4 as shown 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 the lead conductor 5a and the identification side lead rod 2a, respectively.

In FIG. 3, reference numeral 91 denotes a stand frame on which the insulating frame 8 is erected, and has an operating device (not shown) built therein. Reference numeral 92 denotes an operating rod, the upper end of which is connected to the movable lead rod 2b of the vacuum interrupter 1, and the lower end thereof operatively connected to an operating device (not shown) within the gantry frame 91. This is a surface plate erected on a 93-bar mount frame 91. This is a 941d edge support.

The coil conductor 4 is constructed as shown in FIG. That is, the conductor 4 (1i) is made of rectangular steel material, for example, and is wound in a flat direction to form a substantially ring shape, and has one end 41 and 42.
, 47! A pair of connection leads 6a and 6b are provided which stand vertically apart from each other and extend in the radial direction from the center so as not to touch each other. This pair of tangents θHp +)-Dro a.

6b is made of the same copper material as the coil conductor 4;
At the end of this connection lead 6a, there is a connecting portion 5 of the lead-out conductor 5a.
2, and a peace part 61 that contacts the fixed lead rod 2a at the end of the connection lead 6b. A spacer 60 is interposed therebetween. The spacer 60 is made of a low conductivity material such as stainless steel or Inconel.
Brazing is done by welding the ends of the connection leads 6a and 6b.
It is fixed to B1. Therefore, when the columnar conductor 6 is fitted into the ring contact 53 of the lead-out conductor 5a, it is electrically connected to the coil conductor 4F and the lead-out conductor 5a. Moreover, if the end of the lead rod 2a on the fixed side of the vacuum interrupter 1 is pressed against the peace part 61 of the connection lead 6b, the pull-out comb body 5
a, the coil conductor 4 and the vacuum interrupter 1 are each connected in series in the box 1.

Description of the fixing structure of the coil conductor 4: The coil conductor 4 is arranged in an annular groove 84 formed in the thick part of the insulating frame 8, and is placed in a molded comb or the like. Full, l @ buried in insulator 7 (Figure 3)
.

This Z/IAj+r frame 8, as shown in FIG.
For example, all three phases are formed in a frame 85 of 1F+3.

8; 3 is an empty chamber for housing the vacuum interrupter 1, and has a through hole 81 at the bottom through which the movable lead rod 26 passes.
Reference numeral 84 is an annular groove formed at a constant depth in the axial direction in the thick part of the insulating frame 8, into which the coil conductor 4 is inserted, as described above. Therefore, by inserting the coil conductor 4 horizontally from above the annular groove 84 and seating it on the bottom of the groove, and injecting molded rubber into the annular groove 84 to backfill the upper space, the coil conductor 4 is It is integrally combined with the insulating frame 8.

As shown in FIG. 3, the lead-out conductors 5a and 5b are constructed by arranging insulating connecting rods J3 unilaterally on the circumferential side of the insulating frame 8 with the insulating frame 8 in between, and embedding them in both ends. The dowel nut 14 and the bolts 15 that connect the lead-out conductors 5a and 5b, respectively, are fastened (FIG. 4). and,
A lower portion of the insulating frame 8 is connected to an insulating column 94 .

Next, another embodiment of the present invention will be described based on FIGS. 6 and 7. FIG. 6 corresponds to FIG. 4, and the same parts are indicated by the same reference numerals, and the explanation thereof will be omitted since it is the same. Thus, in FIG. 6, the coil conductor 4 has its connecting lead 6a.

6b have a constant vertical 1α height, and their ends extend in the radial direction of the coil conductor 40, and their ends are arranged in parallel. On the other hand, as a means for fitting and press-bonding the connection leads 6a and 6b with the lead-out conductor 5a and the lead rod 2a, the columnar conductor 6 is integrally formed with a recessed protrusion 62 at its lower end, and a semicircular shape is formed on the lower surface of the columnar conductor 6. A spacer 6 made of a low conductive material is fixed so that it is flush with the stepped protrusion 62.
The columnar conductor 6 is formed as a component independent from the connection leads 6a and 6b. The lower surface of this columnar conductor 6 is connected to the spacer 6 on the upper surface of the connection lead fia, 5b.
3 is in contact with both connection leads 6a, 6 and 6b, and the connection leads 6a are connected by brazing or the like.
, 6b. And the lead rod 2a on the fixed side of the vacuum interrupter l and the connecting lead.

6 at 6 b is made through a cylindrical conductor 64.

The cylindrical conductor 64 includes a flange 66 that is the same as the mounting flange 65 fixed to the lead rod 2a, and a ring contact 68 for inserting the lead rod 2a into the cylindrical portion 67. Then, a stepped protrusion 69 is formed at the end that contacts the connection leads 6a and 6b, and a spacer consisting of a tongue 1, a force 1, and a semicircular low conductive force 1 that is flush with the stepped protrusion 69. 70 d! It's stuck open. When the cylindrical conductor 64 is fixed to the connection lead 6 a+' 6 b by brazing, the spacer 63 of the columnar conductor 6 and the spacer 70 of the cylindrical conductor 64 are the same, as shown in FIG. The upper and lower positions are arranged to intersect so as not to contact the parts at the same time. Then, the lead rod 2a of the vacuum ink cleaner 1
Press-fit the end of the ring contact 68 of the cylindrical conductor 64, and connect the mounting flange 65 and 7 flange 6 (i) with the screw 71.
This agreement is concluded hereunder.

Another embodiment of the present invention will now be described with reference to FIGS. 8 and 9. Figure 8 corresponds to Figures 4 and 6, and the same parts are denoted by the same symbols (2, the tax 1
Since the details are the same, they will be omitted. 2) In Figure 8, the connection lead 6a of the coil conductor 4, fit)
have a certain vertical height and their ends are the coil conductors 4
It extends in the radial direction from the center thereof, and is attached by integrally forming a connecting part 72 as a means for fitting and press-fitting the ends thereof with the drawer/provider 5a and the lead rod 2a. . As shown in FIG. 9, this connecting portion 72 consists of a pair of cylindrical bodies 75 into which ring contacts 73 and 74 are fitted.
, 76 are axially opposed to each other and connected with a spacer 77 made of a high-resistance material in between. As shown in FIG. 9, this spacer 77 is a disc-shaped body having projecting portions 78 and 78 formed on both surfaces thereof into which cylinders 75 and 76 are fitted.

The tips of the connection leads 6a and 6b are fixed to the spacer 77 made of a low conductive material by brazing. In this case, the connecting lead 6a.

At the ends of the cylinders 75 and 76, abutting ends 79 and 80 are formed having inner curvatures equal to the curvature of the outer peripheries of the cylinders 75 and 76, and one of the ends protrudes to a position with a larger vertical height than the other. It is formed by Therefore, the connection lead 6
A and 6b can be independently connected to cylinders 75 and 76 which are vertically positioned with a spacer 77 interposed therebetween by brazing. Note that 81 indicates the connection lead 6b and the cylinder body 76.
An insulating gap should be formed between the upper cylindrical body 75 and the electric IAt force S1 connected to the upper cylinder 75 for conduction so that there is no short circuit conductor 11 to the cylindrical body 76 connected to and conductive to the connection lead 6a. form.

The connecting portion 520 of the conductor 5a of the bow 1 coupled to the cylinders 75 and 76 and the 1-node rod 2a of the vacuum incrector 1 are ring contacts 73 and 74, respectively.
It is a cylindrical body that can be fitted into. Then, when the connecting portion 520 is press-fitted into the upper cylindrical body 75 and the 1-node rod 2a is press-fitted into the lower cylindrical body 76, the lead-out conductor 5a, the coil conductor 4, and the vacuum interference 1 are respectively conductive.

In this way, the coil conductor 4 is buried in the insulating frame 8, and the lead-out conductor 5a, the coil conductor 4, and the vacuum incretor l are connected to each other, and each contact 5 is
4 are electrically connected to the main circuit conductors 9a, 9'b, and the operating rod 92 is driven upwards to bring the contacts 3a*3b into contact as shown in FIG. The conductor 9a reaches the lead-out conductor 5a, and the lead-out conductor 5
The columnar conductor 6 (Fig. 4) in contact with a, the columnar conductor 6 and the stepped protrusion 62 (6th mej), or the cylindrical body 75 (Fig. 8) are respectively It flows to the connection lead 6a, goes around the coil conductor 4, and flows to the connection lead 6b.

The connection leads 5a and 6b are spaced apart from each other, and
Since the coil conductors 61, 63, and 77 are interposed, the current necessarily flows around the coil conductor 4. Then, the current flowing through the connection lead 6b flows through the lead rod 2a of the vacuum interrupter 1, passes through the contacts 3a and 3be, reaches the lead rod 2b on the fixed side, and reaches the output conductor 5b of the load side main circuit. As a result of the current flow, a magnetic field is formed in the coil conductor 4 in the axial direction of the nitride interrupter 1, so that when the contacts 3a and 3b are opened, fAll-i... The arc that occurs when the contact opens and opens is captured by the outside of the cannon, and the anode spot quickly disperses without becoming multi-point, blocking one point all year round and improving the breaking performance. be.

4. The method of assembling the coil conductor 4 and vacuum interrupter 1 is as follows: +7. f'j iF>vacancy of frame 88. ), the vacuum interrupter 1 is placed inside 1, the lead rod 2b is passed through the through hole 81 to the outside rJ1+Q, and the coil conductor 4 is placed inside the hole 81.
of"! ? 'l-like lf? While charging and fixing into the tF 34, apply the filling insulator 7, press the connection lead 6b and the lead rod 2a, or fit and engage with the 1h-shaped conductor 64 or the cylinder 76. 12. Attach the lead conductor 5a so that the columnar conductor 6 fits into the ring contact 52 or the connection part 520 fits into the cylindrical body 75, respectively, and attach the lead conductor 5b to the lead rod 2b, and finally connect the insulation connection. stick 1
3 is interposed between the lead-out conductors 5a and 5b and fastened with bolts 15, and this assembly is fixed on an insulating column 94 as shown in FIG.

In addition, although the above-mentioned embodiment in Toge and Akira describes the configuration in the case where the coil conductor 4 is connected to one (upper) lead-out conductor 5a, the present invention is not limited to this, and the other (lower)
When the coil conductor 4 is connected to the lead-out conductor 5b of
This can be implemented in a similar manner by forming a corresponding one.

As is clear from the above explanation, the present invention has the following divine effects.

<1) The JN9 interrupter 1 and the coil conductor 4 are configured separately, and the vacuum interrupter 1 is connected to the lead-out conductor 5.
A, 5b are fixedly installed in the insulating frame 8, while the film conductor 4 is buried in the insulating frame 8, and the lead conductor 5a (father is 51)) is connected to the coil conductor 4. Since this constitutes a vertical IS field application type vacuum breaker for the first time, the vacuum interrupter 1 has coil electrodes 4a and 4b inside (see Fig. 1) or a coil conductor outside as in the conventional vacuum interrupter 1. 4 (see Figure 2) directly. Compared to a vertical magnetic field application type vacuum breaker configured with a magnetic field application type vacuum interrupter, the configuration of the vacuum interrogator 1 itself is extremely simple, and a vacuum breaker that is inexpensive and easy to assemble can be obtained. (2) A vacuum interrupter capable of applying a 111 magnetic field by connecting the lead conductor 5a and the coil conductor 4 of the vacuum interrupter 1 in a removable manner by means of a fitting press-contact coupling means. Since the vacuum interrupter 1 can be easily constructed, there is an advantage that an existing vacuum interrupter 1 can be used. Furthermore, since the coil conductor 4 is of an identification type, even if the distance between the pair of contacts 3a*3b widens when the coil conductor 4 is disconnected, there is no attenuation of the magnetic field, and the breaking performance can be improved.

(8-inch lead-out conductor 5a (51)) has a uniaxial (linear) structure between the terminal part 5 and the connecting part 52 via the spacer 7, so compared to the conventional lead-out conductor, It does not become very large, elongated, or complicated, and does not lead to an increase in the size of the vacuum breaker or even to devices such as a switchboard.

(4) The coil conductor 4 is integrally provided with connection leads 6a and 6b at both ends in the winding direction, and the coil conductor 4 provided with the connection leads 6a and 6b is buried in the insulating frame 8. Therefore, there is no need to perform special insulation treatment on the coil conductor 4, and since the coil conductor 4 is later buried in the annular groove 84 formed in the insulating frame 8, it is possible to use a metal body with a rough shape. This eliminates the problem of rank formation, which tends to occur with cast insulators that contain insulators, and it is possible to obtain a vacuum breaker with high reliability and durability.

(5) Since the coil conductor 4 is placed and fixed on the outer periphery of the vacuum interrogator 1, its installation position is appropriately positioned with respect to 1μ゛, and the vacuum breaker is configured in a suspended state by applying the optimum magnetic field to the arc. be able to.

(6) Due to the effect of (5) above, the position of the coil conductor 4 is variable, so when it is necessary to provide a sensor to inspect the degree of vacuum of the vacuum interrupter 1, the sensor is located near the contacts 3a and 3b. It is better to set it in
The sensor can be mounted by slightly shifting the position of the coil conductor 4.

(Since the 7, 1 coil conductor 4 is provided outside the vacuum interrupter 1, its material is not limited to steel, but may also be aluminum. Also, as in the case where 1, 1 is provided inside the empty interrupter 1, oxygen-free copper Since it may be a manufactured product that requires complicated manufacturing processes such as degassing or degassing, it is possible to obtain a generally inexpensive coil conductor and, by extension, an inexpensive vacuum breaker.

[Brief explanation of drawings]

@Figure 1 and Figure 2 are schematic diagrams of a conventional vacuum interrupter.
3 is a cross-sectional side view of essential parts of a vacuum breaker according to an embodiment of the present invention, FIG. 4 is an exploded perspective view of the lead-out conductor, coil conductor, and vacuum interrupter in FIG. 3, and FIG.
6 is an exploded perspective view similar to FIG. 4 in another embodiment of the present invention, and FIG. 7 is a perspective view of the insulating frame.
FIG. 8 is an exploded perspective view similar to FIG. 4 or FIG. 6 in another embodiment, and FIG. 9 is an exploded perspective view of the embodiment shown in FIG. 8. FIG. 3 is a longitudinal cross-sectional view showing a connected state. 1... Vacuum interrupter, 2a, 2b... Lead rod, 3a, 3b... Contact, 4... Coil conductor, 5a,
5b--drawing conductor, 6a, 6b... connection lead,
9a, 9b---Main circuit conductor, 6[j, 6:(, 7
7@...Spacer. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7

Claims (2)

[Claims] (1) A pair of opposing lead rods (2a, 21)) which hermetically penetrate the vacuum container (10) and can approach and separate from each other are provided, and each lead rod (2a, 2b) has a contact point (21) at its inner end. A vacuum interrupter (1) comprising a main circuit conductor (9a, 3b) and a main circuit conductor (9a, , 91)), a pair of lead-out conductors (5
a, 5b), an insulating frame that holds the vacuum interrupter (1) and the lead-out conductor (5a, 5b), and an insulating frame that is wound around the outer periphery of the vacuum container (lO) of the vacuum interrupter (1), and Coil conductor (4) that generates a magnetic field parallel to the arc generated between a pair of contacts (3a, 3.b)
In the vacuum breaker, the insulating frame is formed into a substantially cylindrical insulating frame (8), and at least one coil conductor (4) is embedded in the insulating frame (8). A pair of connection leads (6a
−. 6b), the ends of the connection leads (6a, 6b) are extended in the radial direction of the coil conductor (4), and one of the connection leads (6a, 61) is formed.
) and one of the above-mentioned lead-out conductors (5a, 51)
), while connecting the Hakata connection leads (6a, 6
1) ) and one of the lead rods (2a, 21)
), the vacuum breaker is characterized by a lever 7 which makes these connections by means of detachable fitting pressure bonding means. (2) The fitting pressure bonding means has a spacer ((ill, 6:3, 70, 77) made of a low conductive material, and the spacer (() fl p b: (*γ(1, 77)
') are interposed between the lead rod (2a) and the lead-out conductor (5a) on the upper and lower surfaces of the connection lead (6a. fi b ), respectively. Portrait described in section] Nishi 7 and JR resistant equipment.