JPS59820A - Vacuum interrupter - 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 vacuum interrupter, and more particularly to a vacuum interrupter capable of applying an effective magnetic field parallel to an arc.

What has been done in the past to improve cutting performance? For the purpose, a vacuum interrupter that applies a magnetic field (axial magnetic field) 'fr parallel to the arc has not been provided, and the coil for generating the magnetic field is not suitable for the arc? Generally, the electrodes are provided on the backs of a pair of electrodes that can be freely moved toward and away from each other.

Is this an example of a conventional vacuum interrupter that applies an axial magnetic field? Shown in Figure 1. In the figure, / is a vacuum container, 2 is a solid redundant lead rod, 2a is a movable lead rod, and 3 and 3a are contact parts in the center. Are the arc electrodes on the fixed and movable side of the device, l and ga the axial magnetic field? The coil electrodes are provided at the ends of the fixed and movable lead rods and 2a, respectively, and are connected to connecting fittings lb? This is because it is connected to the backs of the fixed and movable arc electrodes 3 and 3a through.

Generally, the coil electric wire wI and hiroa consists of a plurality of arms (not shown) positioned in the radial direction and an arcuate portion having one end connected to the outer end of each arm. The inner end portion (end portion in the extending direction) of each arm is connected to the connection portion μb? is connected to the back of each arcing electrode 3.3a through the lead rod, thereby changing the current in a loop between the lead rod and the contact and thus generating an axial magnetic field.

In FIG. 1, S represents a bellows and t represents a shield.

By the way, in the conventional vacuum interrupter as mentioned above, is there an axial magnetic field? A generating coil electrode is mounted directly on the lead rod 2°-2alC with the arc located behind the pole. According to such a configuration, if a large capacity ratio or large current of the vacuum interrupter is intended, not only the arc electrode 8.3a but also this arc electrode ? ,,?
a @ Attachment p must be fixed by fixing the lead rod λ and increasing the diameter of the core ai to ensure the specified improvement in current density.
However, as the lead rods λ, λ and diameter become larger, the lead rod becomes less susceptible to the influence of the axial magnetic field generated by the coil electrode, Fa, and eddy currents are generated in the lead rods K and Ja, resulting in first-order Raise all issues.

First of all, the eddy currents generated in the lead rods A and A completely weaken the magnetic field, making it difficult to achieve a predetermined magnetic field.

Second, the generation of eddy currents causes a significant phase delay in the current flow.

All of these problems reduce the interrupting performance of the vacuum interrupter by 1.

In view of these circumstances, the present invention attempts to solve all of the above-mentioned problems. The II-rod is shielded from the magnetic field so that eddy currents are not generated by the axial magnetic field.

An embodiment of the present invention will be described below, taking as an example a Makabe interrupter equipped with a single coil electrode assembly as shown in FIG.

Is Fig. 2 the Makabe interrupter of the present invention corresponding to Fig. 1?
The same parts are designated by the same reference numerals. The vacuum interrupter of the present invention is:

Coil 1 for generating an axial magnetic field on the fixed lead rod! A pole 7 is provided, and this coil electrode 7 is a cylindrical body that surrounds both the arc electrode J of the fixed device and the arc electrode 3a on the movable side. That is, the coil electrode 7 is made of a highly conductive material, and, as shown in FIG. 3, has a cylinder A main body provided with an axial slot and a slot T? A trap is provided with a pair of arm portions 7/ , 72 which sandwich and face each other and extend in the axial direction, and a fixed side lead rod λ and a fixed side arc electrode are provided at the inner end portions of the arm portions 7/ , 72 . A conductive portion 7/a7Jar is provided which is fully connected to 3.

As shown in FIG. 4, recesses 73 and 7≠ are provided on both sides of the conductive portions 7/a and 7a in the axial direction (both upper and lower sides in the figure). A small hole 76 into which the high-resistance spacer 10a is inserted is provided within the recess 7 on the lower side in the figure of a. Also, the other conductive part 7
A small hole 75 into which a high-resistance spacer io is inserted is provided in the recess 73 on the upper side of the core a in the figure.

On the other hand, the conductive portion of the coil electrode 7? /a, Tip (lower end) 2 of the fixed side lead rod connected to the upper side in the figure of 7 a
/ is formed in a stepped semicircular shape as shown in FIG. is coupled to the other conductive portion 72a via a high resistance spacer io2.

The high resistance spacer 10 is made of a material with low conductivity such as stainless steel or Heinconel, and the step IK of the fixed lead rod λ is formed with a small hole J.

The coil electrode 7 is inserted into the small hole 7j provided in the conductor A m7J of the coil electrode 7, and the coil electrode 7 and the fixed side rod 11 are integrated.

Also, as shown in the fourth section, the conductive portion 7/ of the coil electrode 7
The arc electrode 3 is connected to the lower side of the 7th electrode a in the figure, and as shown in FIG. 5, the arc electrode 3 has a protrusion 31 and 3.2 steps. A connecting shaft 33 is provided. In this connecting shaft 33, the protrusion 3/ is inserted and coupled into the recess 7 on the lower side in FIG.
A high resistance spacer 10a' (concave part 7 of the other conductive part 7/a) is buried in the small hole 3 of this stepped part 3
The coil electrode 7 and the arc electrode 3 are integrated with each other by being recessed into the small hole 74 and connected to the coil electrode 7. The high-resistance spacer/(7a) is made of the same material as the high-resistance spacer 10 described above.The coil electrode tij7 is made of a highly conductive material, for example.

Copper, copper alloys, gold, silver or gold-silver alloys are used.

As shown in FIG. 8, the upper part of the coil electrode 7 has a substantially annular shape. The reinforcing body // is attached by brazing or the like. The reinforcing body // is the arm portion 7/ of the coil electrode 7.
, ? 2 and conduction ffB7/a, an open groove into which the 7 cores fit, and circular holes ii and b are all plate-like bodies made of a high-resistance material such as stainless steel or Inconel.

On the other hand, a characteristic configuration of the present invention is that the connecting shaft 3.1f is made of a high resistance or low conductive material such as stainless steel or Inconel, and as shown in FIGS. A plurality of conductors made of a low resistance or high conductivity material may be buried to form a vortex flow prevention body. The conductor 12 is inserted in the axial direction at the protrusion 31 of the connecting shaft 33, and the upper and lower ends of each in the figure can be connected to the recess 7μ of the conductor 72a and the arc electrode 3 on the fixed side. In particular, the upper end of the conductor 12 is made to slightly protrude from the connecting shaft 33, while this? A hole 7a is provided in the recess 7a of the connecting conductor 7a to fit the entire upper end of each conductor □l. Is this hole 74t a the upper end of the conductor/co? It does not completely sink in, but has a slight gap between it and the bottom of the hole to maintain clearance against the impact that the conductor receives.

It has been found through experiments that the relationship between the diameter of the conductor and the lap dimension 21 with the connecting shaft 33 is preferably 11≧human≠. Furthermore, the connecting shaft 3
Similarly, it has been found that the height of the coil 1 is preferably 002 to 1 times the diameter D (FIG. 2) of the coil 'FIL1#L7.

On the other hand, as shown in No. 61J and FIG.
An eddy current preventer 13 is formed at the connection portion.

This eddy current preventer /3 is a cylindrical body /44 made of a high resistance or low conductivity material such as stainless steel or Inconel.
Arc electric [i,? The back part of the lead rod 2a is connected to the tip of the lead rod 2a by brazing, and a plurality of conductive bodies laa? Buried, arc electrode,? a and lead rod 2a? It becomes conductive.

Cylindrical body/9 is inside? Equipped with a dummy hole for a communication hole to create a vacuum. Further, the conductor/2a is a column made of a low resistance or high conductivity material, and is inserted into the hole Δ drilled in the lead rod 2a with a slight gap completely blindly from the bottom of the hole, so that the conductor/2a is small. clearance for impact? Retained knob dimensions 2. The relationship between and the 11 diameter d of the conductor/J a is that the arc electrode 3
The distance between the back of the lead rod a and the end of the lead rod core a is 00.2 of the diameter of the coil electrode 7.
It has been found that ~/x is preferred.

To explain the current flow in the vacuum interrupter configured as above, the current of the lead rod on the fixed side is conducted to the arm part '71 through one of the conductive parts 7/ak, and the current flows to the arm part '71 through the one conductor part 7/ak. It becomes a loop shape at , and the other arm part 7
The conductor /2 of the connecting shaft 33 through the conductor 7 and the conductor a'Q
and reaches the arc electrode 3.

When the arc electrode 3.3a comes into contact, the current flows from the arc electrode 3a to the lead rod 2a via the conductor lcomiQ. Thus, when current flows, an axial magnetic field is generated in the coil electrode 7 due to the current flowing in a loop around the cylinder 9.

In addition, in FIG. 2, Ja is a floating shield for completely preventing flashover between the coil electrode 7 and the arc electrode 3a, and the inner circumferential surface of the coil electrode 7? Cover and vape! ,! i J,
a a 2 surrounds and has the same potential as shield A. Is the floating shield Ja the arc withstand voltage characteristics of pole 3a? It is something that enhances. The shields Ab and ta are shields having the same potential as the lead rods 2 and za, respectively, and the shield O is at an intermediate potential.

Next, another embodiment of the present invention will be explained.

FIG. 8 shows a configuration 1 corresponding to FIG. 4, the same parts are denoted by the same reference numerals, and detailed explanation thereof will be omitted. Therefore, the eddy current preventer 13 has an axial slot/3af
It consists of a provided cylindrical body 15, and a conduction part 72a buried inside the cylindrical body 15, which is electrically connected to the arc electrode 3 (t). The cylindrical body Is is a cylindrical body made of a high resistance or low conductivity material such as stainless steel or Inconel (FIG. 9), and the conductive body 12 is a column body made of a low resistance or high conductivity material as described above. The figure shows a conductive part 7/a of the coil electrode 7,
This shows the connecting shaft JJa that should be connected to the concave part 7 of 72a and the arc' N pole 3. For example, the connecting shaft J shown in Fig.
The spacer 10af is removed from J a to make the height of the stepped portion 32Tz the same as that of the protruding portion 31, and a protruding portion JJ b to replace the spacer 10 a is formed on the upper surface of the stepped portion 32 at the same level in the figure. It is a set up yc thing. The groove 330 is the guide a part 7/a.

This groove J is formed corresponding to the gap between 7Ja and ? o does not need to be provided. i^, The head end of the conductor l protrudes as in Fig. 4.

In the above embodiment, arc 1. Increase in mechanical strength of lead rod λ, Za against the impact that pole 3 should receive? Due to this,
Arc Den iF#? This completely prevents the generation of eddy currents in the nearby 11-rod rod λ.

As described above, according to the present invention, the lead rod 2. An eddy current preventer/3f made of a high-resistance material is interposed at the connecting portion between the core a and the arc'rIL pole 3.3a, and 72 conductors made of a plurality of highly conductive materials are embedded in the eddy current preventer/3. , and the current flows through the conductor 12F to the lead rods -
2a and the arc electrode 3.3a so that they are electrically connected, the coil 1! The connection portion between the lead rods 2, 2a and the arc electrodes J, ja, which are easily affected by the influence of the r-pole 7, is protected by a high-resistance material, and the conductor /2 is connected to the coil electrode 70.
Axial magnetic field generated? It is shielded and does not generate eddy currents.

And is the lead rod λ, -2a an eddy current? Since it does not occur, there is no weakening of the effective magnetic field 1 generated by the coil electrode 7, and there is a phase lag between the magnetic field generation and the current. Don't let it happen.

In this way, the generation of eddy currents is extremely small and can be ignored, so there is no attenuation of the axial magnetic field.

Furthermore, lead rod J, t? A is reinforced with a strong material such as stainless steel or Inconel, increasing the mechanical strength of the vacuum interrogator.

In addition, the eddy current prevention body 13 includes a plurality of conductors /Ja?
Since it is buried, the desired current value can be determined by adding or subtracting the number of conductors. The lead rod 12a, which can be obtained and has an eddy current prevention effect, can be used in common, which contributes to cost reduction.

It is clear that the present invention can be used not only in the interrupter but also in a conventional vacuum interrupter as shown in FIG. 1.

[Brief explanation of drawings]

Is Figure 1 a conventional vacuum interrupter? FIG. 2 is a vertical side view showing one embodiment of the present invention, FIG. 8 is an exploded perspective view of a coil electrode, and FIG. 4 is a vertical cross-sectional view of main parts showing an eddy current preventer on the fixed side. , FIG. 5 is a partially longitudinally sectional perspective view of the arc electrode on the fixed side. Figure 6 is a longitudinal cross-sectional view of the eddy current preventer on the movable side, Figure 7 is a cross-sectional view along the line ■-■ in Figure 6, and Figures 8 to 10 are all other examples of the eddy current preventer on the fixed side. It is a longitudinal section [F] and a perspective view shown. l...Vacuum container, 2a...Lead rod, ,3
．． ,? a...Arc electrode, 7...Coil 118%
/21 /2 a...Conductor, /J...Eddy current preventer. Figure 2

Claims (1)

[Claims] A pair of lead rods introduced into the interior of a vacuum vessel, and an effective magnetic field attached to at least 10,000 of the lead rods and parallel to the arc? The generating coil electrode, the arc electrode provided at the end of each lead rod, and the arc electrode connected to the 11-dead rod?
In the vacuum interrupter, each arc electrode (3) is provided so as to be able to come into contact with and separate from it through the vacuum interrupter. (3a) and each lead rod [2), (21!L) connection part K, eddy current prevention body (/J) made of high resistance material? A vacuum interrupter characterized in that a plurality of conductive bodies (/2), (/J a)f made of a highly conductive material are embedded in the eddy current preventive body (/3).