KR880001832B1 - Breaker - Google Patents

Abstract

The portions penetrating the disc (2b) are in the form of tubes of ceramic containing alumina, mullite, zircon or steotite. A film or coating (21b, 21c) of chromium oxide is formed along the inner and outer surfaces of each tube to a tickness of less than 0.1 of a micron. The interior of each tube is filled with copper to provide an array of major current-conducting sections. The ratio of the surface area of the disc is between ten and ninety per cent of the cross-sectional area of the contact, measured perpendicular to the direction of flow of the major current conducting sections (22).

Description

Electrode of vacuum circuit breaker

1 is a side cross-sectional view of a vacuum circuit breaker with an electrode according to the present invention.

2 is a front view illustrating one embodiment of an electrode structure according to the present invention applied to a self-driven vacuum circuit breaker.

3 is a plan view illustrating a classification member applied to a magnetically driven vacuum circuit breaker.

4 is a front view illustrating a modification of the electrode structure shown in FIG.

Figure 5 is a front view cut a part illustrating an electrode structure according to the present invention applied to a seed type vacuum circuit breaker.

6 is a plan view of the coil member applied to the seed-type vacuum circuit breaker.

7 is a plan view of a split conductive member applied to a seed type vacuum circuit breaker.

FIG. 8 is a front view of a portion illustrating another embodiment of the electrode structure according to the present invention applied to a seed type vacuum circuit breaker. FIG.

9 is an enlarged cross-sectional view taken along the line V-V in FIG.

10 is an enlarged cross-sectional view illustrating another embodiment of the electrode structure shown in FIG.

11 to 15 are photographs illustrating a junction portion between a low conductive member made of ceramic and a highly conductive member made of metal with respect to the electrode structure shown in FIG.

16 is an enlarged cross-sectional view illustrating a modification of the electrode structure shown in FIG.

* Explanation of symbols for main parts of the drawings

2: electrode 2: quasi-resistive member

14 electrode 21 21 low conductive member

22: highly conductive member 21a, 21d: through part

21b, 21c: chromium oxide film

The present invention relates to an electrode of a vacuum circuit breaker, and more particularly to an electrode structure of a vacuum circuit breaker having improved mechanical strength.

Generally, the electrode of the vacuum circuit breaker provided so that a contact is possible in a vacuum container via a pair of electrode rods is formed in substantially disk shape with copper or copper alloy. This electrode has a problem that the mechanical strength of the electrode is relatively weak because a plurality of grooves or splits are formed in the electrode.

By the way, a vacuum circuit breaker is normally divided into two types. One is a magnetic drive type to drive the discharge by magnetism to improve the breaking performance, and the other is by applying an axial magnetic field parallel to the discharge to prevent concentration of the discharge and stably disperse the discharge so that the breaking performance is improved. It is of seed type to improve.

For example, a magnetically driven vacuum circuit breaker may be a plurality of electrodes extending radially and circumferentially through a taper and ending at a flat end, as described in the specification of GB 2031651A, published on April 23, 1980. It has a circular arc groove.

In addition, the seed type of the vacuum circuit breaker has a plurality of splits extending from the outer periphery to the center as described in the specification of US Patent 3946179, filed March 23, 1976. Therefore, both electrodes described above have a large number of grooves or splits formed therein, and thus long life cannot be expected due to mechanical fast energy generated when the electrodes are opened and closed. In addition, for any type of electrode, the mechanical strength is further lowered by annealing the electrode whose mechanical strength has been lowered as described above with the electrode or other element of the vacuum circuit breaker by soldering or gas discharge treatment. In addition, in the electrode applied to the self-driven vacuum circuit breaker, since there are a plurality of spiral grooves, each discharge segment is easily deformed.

In particular, in an electrode applied to a seed-type vacuum circuit breaker, it is known to form a plurality of radial splits that prevent eddy currents from occurring in the electrode by causing the axial magnetic field to intersect with the electrode, thereby reducing the blocking performance. . However, the fall of mechanical strength becomes a problem by setting it as such a shape.

An example of the related art related to the electrode structure of the vacuum circuit breaker of the present invention is as follows.

U.S. Patent No. 3592987 discloses an electrode structure of a vacuum circuit breaker which holds a disk made of a getter material on one side or the other back side of the detachable electrode and performs gas adsorption occurring when the electrode is opened and closed. This electrode structure is made of fibers of getter material embedded in a matrix of good conductivity.

U.S. Patent No. 3614361 discloses a relatively flat disc made of a high cathode drop material, and a spiral groove extending inward from the outer periphery of an electrode filled by a solid low cathode drop material, and facilitating rotation of the discharge. An electrode structure for performing arc extinguishing is disclosed. Since these prior arts do not aim to improve the mechanical strength of the electrode, it suggests an electrode structure different from the present invention described later.

An object of the present invention is to provide an electrode structure of a vacuum circuit breaker that can improve or increase the mechanical strength.

Another object of the present invention is to combine the coil member, and when applied in the seed field type, the electrode has anisotropy in the direction of the current passing through and perpendicular to the conductivity, thereby enabling the suppression of the eddy current. An electrode structure of a vacuum circuit breaker is provided.

Another object of the present invention is that when the electrode is applied to a seed field type formed by an electrode main portion made of a magnetic material, the electrode structure has anisotropy in each of the above-described directions, thereby adding or suppressing eddy currents, The present invention provides an electrode of a vacuum circuit breaker that can effectively use the system.

It is still another object of the present invention to provide an electrode of a vacuum circuit breaker with a remarkably improved current carrying capacity.

It is still another object of the present invention to provide an electrode of a vacuum circuit breaker that can improve the bonding strength between the low conductivity portion and the current passing section formed integrally therewith, thereby increasing the mechanical strength significantly more conventionally.

Another object of the present invention is that when the electrode is formed of a plurality of bundled pipes of ceramic or metal, and the highly conductive member such as copper is filled between each pipe and the pipe, the electrode has a high mechanical strength and the above-mentioned direction. The present invention provides an electrode of a vacuum circuit breaker which has anisotropy and can effectively suppress eddy current.

Another object of the present invention is that when the electrode is filled with a plurality of bundles of ceramics or metals or has a plurality of through-holes and is formed of a solid member, for example, copper is filled in each solid member which is formed in an approximately honeycomb shape, The present invention provides an electrode of a vacuum circuit breaker that retains high mechanical strength and anisotropy in the above-described directions, and can effectively suppress external flow.

Another object of the present invention consists of a substantially disk-shaped highly conductive member having a low conductivity portion made of ceramic and a plurality of through holes filled with chromium-containing copper so as to form a plurality of main current path sections, Accordingly, in addition to the advantages described above, the present invention provides an electrode structure of a vacuum circuit breaker that facilitates fabrication.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a vacuum circuit breaker having an electrode structure according to the present invention is shown. This vacuum circuit breaker is constructed as follows. A plurality of insulating cylinders 11 (two in the embodiment) of glass or ceramic are coaxially joined via the intermediate side sealing brackets 12 and 12 to constitute one insulating cylinder 1. The insulating cylinder 1 is sealed by a disk-shaped end plate 13 and 13 made of metal via sealing brackets 12 and 12 on the upper and lower sides, and the inside is evacuated so as to have a high vacuum, and the vacuum container 1 ) Is formed.

In the vacuum vessel 1, an electrode rod 14 which is replaced while maintaining the airtightness of the vacuum vessel 1 at the central portion of the end plate 13 so that a pair of electrodes 2, 2, which will be described later, are switched on and off. 14) is configured to introduce relatively switchable on-off.

In Fig. 1, reference numeral 15 denotes a bellows provided to maintain the airtightness when the movable electrode 14 is moved in the vacuum chamber 1.

Reference numeral 16 denotes a cylindrical discharge shield member, the intermediate portion of which is supported by the support pin 17 sandwiched between the intermediate side sealing brackets 12 and 12.

As shown in FIGS. 1 and 2 illustrating the magnetic drive type, the electrode 2 is larger than the outer diameter of the electrode 14 and is formed almost in a disk shape. The electrode 2 has a diameter substantially the same as its outer diameter, and is joined to the inner end of the electrode rod 14 through the split conductor 3 formed in a disc shape, and the contact surface (the upper surface in FIG. 2). In the center portion, a ring-shaped or button-shaped connector 4 having a recessed portion 4 'is joined.

The split conductor 3 is formed to have an anisotropy in conductivity or the like as described later to classify a current flowing from the electrode 14 to the electrode 2. This split conductor 3 has a plurality of arms 32 extending radially outwardly from, for example, a circular central portion 31 and an evenly divided position on the outer periphery of the central portion 31, as shown in FIG. And a plurality of circular arcs 33 curved in the same circumferential direction with the radius of curvature of the electrode 2 at the end of each arm 32, but the shape is not limited to the disk shape. It is also possible to have a plurality of pedals extending spirally outward from the junction, and the contactor 4 is not necessary.

자 형상에 흘려서 자기구동력을 얻도록 하여도 좋다.For example, as shown in FIG. 4, the contact 4 is provided with a circular recess 2a in the center of the contact surface of the electrode 2, and conducts a conduction current.

The magnetic driving force may be obtained by flowing in the shape of a child.

FIG. 5 is a front view showing a cut example showing a configuration example in which the electrode 2 of the present invention is combined with the coil member 5 for generating an axial magnetic field in a seed type vacuum circuit breaker.

The coil member 5 has a plurality of arms 52a, 52b, 52c radially outward at a position equally dividing the circular center conductor 51 and the outside of the center conductor 51 as shown in FIG. 52d is extended, and arcs 53a, 53b, 53c, 53d having the radius of curvature of the electrode 2 at the end thereof are curved to form the same circumferential direction. The connecting conductors 54a, 54b, 54c and 54d for connecting the split conductors 3 described later to the ends of the sections 53a, 53b, 53c and 53d are provided in the axial direction.

The coil member 5 is joined to the inner end of the electrode 14 via the center conductor 51.

As shown in FIG. 7, the split conductor 3 includes a plurality of arms 35a and 35b extending radially outward at a position equal to the circular center 34 and the outer circumference of the central 34. 35c) 35d, and at the end thereof, the circumferential direction is opposite to the arc portions 53a, 53b, 53c, 53d of the coil member 5, and the radius of the electrode 2 is set as the radius of curvature. The circular arc portions 36a, 36b, 36c, and 36d are curved in an arc shape.

Between the central conductor 51 of the coil member 2 and the central portion 34 of the split conductor 3 is interposed a resistance spacer 6 of low conductivity, such as stainless steel or ceramic, and the coil member 5 is connected. The conductors 54a, 54b, 54c and 54d are connected to the arc portions 36a, 36b, 36c and 36d of the split conductor 3, respectively. In addition, the electrode 2, the coil member 5, etc. in the seed type are not limited to the above-mentioned ones.

"상으로 형성하여도 무방하다. 이때, 분류도체(3)은 전술한 자기구동형의 것과 같이 원반상 스파이럴의 것이라도 관계없다. 코일부재(5)는 전극봉(14)의 내단외주부에서 반경방향 외측으로 연장되는 1 또는 2 이상의 제 1아암(55)와, 이 제1아암(55)의 단부에서 전극(2)의 반경을 곡률반경으로 하여 원호상으로 만곡되는 원호부(56)과 , 이 원호부(56)의 단부에서 반경방향 내측으로 연장되는 제 2아암(57), 이 제2아암(57)의 단부에 접합됨과 동시에 저항 스페이서(6)를 개재하여 전극봉(14)의 내단부로 접합되는 접속 스페이서(58)로 구성하여도 좋다.For example, as shown in FIG. 8, the outer periphery of the upper end of the electrode 2 is chamfered,

The split conductor 3 may be of a disk-like spiral as in the aforementioned self-driven type. The coil member 5 is radially formed at the inner end and outer circumference of the electrode 14. One or two or more first arms 55 extending outwardly, an arc portion 56 curved in an arc shape with a radius of curvature of the electrode 2 at an end of the first arm 55, and The second arm 57 extending radially inwardly from the end of the arc portion 56 is joined to the end of the second arm 57 and joined to the inner end of the electrode 14 via the resistor spacer 6. You may comprise with the connection spacer 58 used.

As shown in FIG. 9, the electrode of the present invention is formed of a disk-shaped quasi-resist member 2b which acts as a semi-resistor. The quasi-resistive member 2b is made of a plurality of metals having a high conductivity filled between a low conductivity member 21 made of a material having a low conductivity and a gap formed by a plurality of low conductivity members 21 being closely connected. It consists of two highly conductive members (22).

The quasi-resistive member 2b of the electrode 2 is a metal having a non-electromagnetic resistance of 5 μΩcm or more, and is made of non-magnetic austenitic stainless steel or ferrite (magnetic ferrite) stainless steel, or Fe, Ni, Co. Back is used.

In addition, the metal forming the highly conductive member 22 that provides the main current passing section of the electrode 2 has a lower melting point than the metal of the quasi-resistive member 2b and has a higher electrical conductivity, such as Cu and Ag. , Al or Cu alloy, Ag alloy and the like are used. The surface occupation rate of the highly conductive member 22 in the semi-resistive member 2b is set so as to be 10-90% of the cut surface in the energizing direction of the highly conductive member 22 depending on the current carrying capacity and the mechanical strength. In manufacturing the quasi-resistive member 2b in the electrode 2 having the above configuration, first, the pipe-shaped low conductive member 21 having a circular cross section and having an outer diameter of 0.1-10 mm as shown in FIG. Are connected to each other so as to form a circular cross section, and the plurality of low-conductive members 21 bonded together are housed in a cylindrical cylindrical container (not shown) made of ceramic. After this, for example, a high conductivity metal such as Cu is melt deposited to the hollow portions of the respective low conductive members 21. In this way, a block of the quasi-resistive member 2b is formed, and a predetermined shape electrode 2 is formed through mechanical molding.

Here, the low conductive member 21 is not limited to a circular cross section, but may be, for example, a triangular or hexagonal polygon. In addition, the structure is not limited to a pipe shape and may be a honeycomb-like thing.

Next, another method of manufacturing the electrode 2 will be described. The semi-resistive member 2b has a honeycomb phase of a low conductivity metal or ceramic having a plurality of through holes separated from each other so that the highly conductive material is melt deposited in the thickness direction. Forming a disc.

In this case, the low conductive member 21 includes a honeycomb portion.

As described above, according to the above-described embodiment, a plurality of highly conductive electrodes are isolated from each other and penetrate in the thickness direction of the electrodes of the vacuum circuit breaker which are installed to be switched on and off in a vacuum container via a pair of electrode bars. The member 22 is provided with a main current passing section having a high electrical conductivity.

Therefore, this embodiment can significantly increase the mechanical strength of the electrode 2 as compared with the conventional one.

In particular, in the case of the seed field type in combination with the coil member 5 generating the axial magnetic field, anisotropy in the conduction direction and the direction orthogonal to this in the electrode conductivity becomes possible, thereby suppressing the eddy current. . In addition, when the quasi-resistive member 2b of magnetic metal is formed, the electrode 2 has anisotropy in conductivity and permeability. Therefore, in addition to the suppression of the eddy current, this embodiment can achieve the effect of using the axial magnetic field efficiently.

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

The electrode 2 is a semi-resistive member 2b made of ceramic, such as alumina, mullite, silicon, steatite, or the like formed in a substantially disk shape as shown in FIGS. And a plurality of through portions 21a and 21d which penetrate into each other in a vertical direction (up and down in FIG. 2) on the cutting surface thereof, and at the same time, each through portion 21a and 21d. Each penetrating portion 21a on which the inner circumferential surface of the film is formed has a film thickness of about 0.1 μm or more, for example, chromium oxide films 21b and 21c such as chromium oxide, and chromium oxide films 21b and 21c. (21d) is formed by melting and depositing copper to form a plurality of highly conductive members 22 as described later. Also, the area point of the highly conductive member 22 is 10-90% in the cut surface of the electrode 2 orthogonal to the energization direction of each of the highly conductive members 22 depending on the current carrying capacity and the mechanical strength.

The method of manufacturing the electrode 2 of the above structure is as follows.

First, a pipe-like low conductive member 21 made of ceramic, such as alumina or Murlite, having an internal diameter of 0.1 mm or more and an external diameter of 0.3 mm or more and fastening a suitable binding member (for example, fastening) Multiple bands) and bind them on a disk.

Next, chromium is deposited on the entire surface (inner and outer circumferential surface of each pipe) of the bound low conductive member 21 so as to have a film thickness of 10 nm or more (100 kPa) or plated chromium to a film thickness of 0.1 μm or more. In the air atmosphere of 10 ^-4 Torr or more, the heating is continued for 10 minutes or more at a temperature of 100 DEG C or more, and oxidation treatment is performed so that a chromium oxide film is formed on the whole surface of the bound low conductive member 21. Then, a bundle of disk-shaped low conductive members 21 having a chromium oxide film was placed so that the hollow portion of each low conductive member was placed in the vertical direction, and a copper piece was placed on the upper end thereof, and then a cylindrical container made of ceramic. It is stored in a vacuum atmosphere (vacuum furnace) of 10 ^-4 Torr or less, or in a gas atmosphere such as helium or hydrogen, which does not oxidize copper, via a lamp or the like. Finally, when the bundle of disk-shaped low conductive members 21 on which copper chips are placed is heated to a temperature above the melting point of copper, that is, 1083 ° C. or higher in the above-mentioned atmosphere, the copper is formed in the hollow portion and the adjacent low conductivity of each low conductive member 21. The highly conductive member 22 is formed by melting and depositing the through parts 21a and 21d formed between the malleable members 21.

Thereafter, in the same atmosphere, the bundle of low conductive members 21 on the disk in which copper is melt-deposited is gradually cooled and the desired electrode 2 is completed as the machine is processed.

In the above-described manufacturing method, the case in which the low conductive member 21 is made of ceramic pipe, and the binding of the low conductive member 21 to a disc shape is formed, and the coating film of chromium oxide is formed on the entire surface thereof, but the manufacturing method is not limited thereto.

For example, a chromium oxide film may be formed in advance on the entire surface of the ceramic pipe (inner circumferential surface and outer circumferential surface), and then the pipe may be bound in a disc shape.

In addition, formation of a chromium oxide film is not limited to the conditions mentioned above. For example, chromium oxide is deposited on the entire surface of each low conductive member or on the entire surface of the bundle of low conductive members bound to a disk, or a film thickness of 10 mm (100 mm) or more, or a suitable solvent is used to form a paste. One-100 mesh chromium oxide powder may be coated with a film thickness of 0.1 µm or more to form a chromium oxide film. Here, the ceramic pipe made of the low conductive member 21 is not limited to a circular one, and may be, for example, a polygon or an ellipse such as a triangle, a square or a hexagon.

Another method of manufacturing the quasi-resistive member 2b made of ceramic is formed from a disk-shaped, for example honeycomb, quasi-resistive body with a plurality of through-holes, perpendicular to the surface and in the insulated portions which are isolated from each other in the low-conductive member. The high conductivity material (Cu) is melted and deposited.

Here, the junction state between the copper constituting the quasi-resistive member 2b and the highly conductive member 22 in the electrode 2 manufactured by the above-described method is 11 to 15 degrees in the following method. It is shown as the grain boundary enlargement shown. The method of manufacturing the semi-resistive member 2b binds a plurality of pipe-like alumina ceramics and forms a chromium film having a thickness of about 1 μm on the entire surface thereof by vacuum deposition, and in air of 10 ^-3 -10 ^-4 Torr. After heating for 10 minutes at a temperature of about 500 ° C. to form a chromium oxide film, copper was melt-deposited at a temperature of 1083 ° C. or higher in a vacuum atmosphere of 10 ⁻⁴ -10 ^-5 Torr to a gap between pipe-like alumina ceramic bundles. Cool slowly in the atmosphere.

11 is a secondary electron image obtained by an X-ray microanalyzer, in which the black portion on the right side is alumina ceramic and the somewhat white portion on the left side is copper, and the waveform portion interposed between the boundary is chromium oxide. 12 is a characteristic X-ray image of the X-ray microanalyzer showing the dispersed state of chromium, and the white part in the center is chromium. 13 is a characteristic X-ray image of the X-ray microanalyzer showing the dispersed state of oxygen, and the white part scattered on the right side is oxygen. FIG. 14 and FIG. 15 are characteristic X-ray images of an X-ray microanalyzer displaying the dispersion state of aluminum and copper, in which the white part on the right in FIG. 14 is aluminum and the white part on the left in FIG. 15 is copper. .

And the bonding strength between the quasi-resistive member 2b and the highly conductive member 22 providing the main current passing section in the electrode 2 manufactured by the above-described method, that is, the bonding strength between copper and ceramic is 5 kg. / mm ² or more, the following characteristics were confirmed by experiment. First, the chromium film formed on the entire surface of each of the low conductive members or the bundles of low conductive members made of ceramic has a uniform film thickness of at least 10 nm (100 microns) by vapor deposition. Second, even in the bonding with copper, the desired bonding strength is obtained by uniform chromium diffusion (both in both ceramic and copper). Third, a uniform diffusion layer cannot be obtained unless the film thickness is at least 0.1 µm during plating. In addition, even when a chromium oxide film was formed by coating a -100 mesh chromium oxide powder in the form of a pest with a suitable solvent, the desired bond strength could not be obtained unless it was applied with a film thickness of 0.1 µm or more.

Here, the oxidation treatment condition of the chromium film depends on the film thickness.

The minimum film thickness (about 0.1 micrometer) required the conditions mentioned above (10 <^-4> Torr 100 degreeC, 10 minutes). The reason for this is because chromium has a high affinity with corals and is easily converted into chromium oxide by trace oxygen contained in the air.

FIG. 16 shows another embodiment of the electrode structure shown in FIG. The semi-resistive member 2b made of ceramic having a plurality of penetrating portions 21a and 21d penetrated perpendicularly to the contact surface of the above-described embodiment of FIG. It consists of a highly conductive member 22 as a main current passing section which is formed by melting and depositing copper into the sections 21a and 21d.

In the above-described embodiment, the chromium oxide films 21b and 21c are formed on the inner circumferential surface of the through portions 21a and 21d to increase the bonding strength between the copper and the ceramic, but the electrode of this embodiment is about 0.1-0.6. Electrodes were formed by filling the through portions 21a and 21d of the disk-like quasi-resistive member 2b made of copper ceramics containing wt% chromium by melt deposition to form a plurality of highly conductive members 22a. will be.

In the manufacturing of the electrode of the above-described embodiment, as in the above-described embodiment of FIG. 10, a plurality of pipe-like low conductive members made of ceramics such as alumina are first bound to form a disk with a binding member.

Next, the disk-like low conductive member bundle is placed so that the hollow portion of each low conductive member is in the vertical direction, and a copper piece containing about 0.1-0.6% by weight of chromium is placed on the upper end thereof. In a vacuum atmosphere (vacuum furnace) of 10 ^-4 Torr or less, or in a gas atmosphere such as helium or hydrogen that does not oxidize copper through a vessel, etc., and finally, they are heated to a temperature above the melting point of copper in the atmosphere. Copper containing 0.1-0.6% by weight of chromium is melt-deposited into the gap between the hollow portion of each low-conductive member and the adjacent low-conductive member, and the desired electrode is completed by slowly cooling them in the same atmosphere.

In the above-described manufacturing method, the case where the quasi-resistive member 2b is formed by binding a plurality of pipe-like low conductive members made of ceramic to a disc shape is described. However, the manufacturing method is not limited to this, but for example, the ceramic having a plurality of through-holes which are bonded to the low conductive member made of polygonal ceramics or penetrated perpendicularly to the plate surface and isolated from each other in the same manner as in the first embodiment. Of course, a honeycomb-like low conductive member may be used to form a quasi-resistive member of a disc shape.

In each of the above embodiments, a description has been given of the case of using the electrode of the self-driven vacuum circuit breaker, but the vacuum circuit breaker can be melted in the seed field type.

That is, it can also be set as the electrode 2 of the seed type vacuum circuit breaker combined with the coil member 5 which produces an axial magnetic field.

The electrode 2 of each of the above-described embodiments is used to directly join a plurality of insulating cylinders 11 to form one insulating cylinder, and to connect both ends of the insulating cylinders in an airtight state with an end plate 13. A case has been described in which the vacuum chamber 1 is formed by evacuating the interior to a high vacuum to be used in a magnetic drive type and a seed type vacuum circuit breaker.

However, the vacuum container 1 applied to these vacuum circuit breakers is not limited to these. For example, both ends of one insulated cylinder made of glass or ceramic can be closed directly with a sealing bracket such as KoVar or closed with an end plate in a vacuum container or an open end of a metal cylinder. Is an end plate made of an insulating material such as ceramic, which is hermetically closed with a vacuum container, or a metal bottomed cylindrical open end of a cylindrical (cap-shaped) body is hermetically closed with an insulating end plate. It may be an electrode of a driving type or seed type vacuum circuit breaker.

As described above, the present invention penetrates in a direction perpendicular to the plane of the semi-resistive member made of a material of high conductivity and a low conductivity member on a ceramic pipe in a substantially disk shape, and is isolated from each other. A plurality of highly conductive members are formed by providing a plurality of through portions formed with a chromium oxide film and simultaneously filling copper through each through portion to provide a main current passing section.

Therefore, the present invention can significantly improve the electric current carrying capacity and at the same time improve the bonding strength between the resistance portion and each main current passing section, and thus the mechanical strength can be dramatically increased without the chromium oxide film. .

Particularly, when used in combination with a coil member that generates an axial magnetic field in a seed type vacuum circuit breaker, it has anisotropy in the conduction direction and the direction orthogonal to the conduction and permeability, so that the generation of eddy currents can be suppressed and the axial magnetic field Can be used efficiently.

The quasi-resistor formed in a substantially disk shape by ceramic has a plurality of penetrating portions which are separated from each other in a direction perpendicular to the plate surface and filled with copper containing about 0.1-0.6% by weight of chromium in each penetrating portion. Therefore, since the electrode of the vacuum circuit breaker is provided so as to provide a plurality of main current passing sections, the production can be easily performed in addition to the above-described effects.

Claims (16)

A pair of electrodes provided in a vacuum container by a pair of electrodes, wherein the electrode comprises an approximate disk-shaped semi-resistive member consisting of a low conductive member and a highly conductive member, and a contact formed thereon. The highly conductive member is made of a metal having lower melting point and higher conductivity than the low conductive member, and formed into a molten cast metal form through the low conductive member in the thickness direction of the semi-resistive member. In the electrode of a vacuum circuit breaker which allows most of the electric current to flow, a plurality of semi-resistive members 2b are separated from each other by a plurality of low-conductive members 21 and extended through a plurality of semi-resistive members 2b. An electrode of a vacuum circuit breaker composed of a highly conductive member (22). The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of any one of metal or ceramic having a proportional resistance of 5 mu OMEGA -cm or more. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of stainless steel. The electrode of a vacuum circuit breaker according to claim 3, wherein the stainless steel is an austenite game. The electrode of a vacuum circuit breaker according to claim 3, wherein the stainless steel is a ferrite game. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of iron. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of nickel. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of cobalt. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is made of ceramic. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) is composed of a plurality of interconnected pipes. The vacuum circuit breaker electrode according to claim 10, wherein the outer diameter of the pipe is 0.1 mm-10 mm. The electrode of a vacuum circuit breaker according to claim 1, wherein the low conductive member (21) holds a plurality of balls filled with the high conductive member (22). In a vacuum circuit breaker in which a pair of electrodes switched on and off by a pair of electrodes are provided in a vacuum container, each disk-shaped quasi-resistive member 2b of the electrode 2 is perpendicular to the plate surface thereof. The interface between the highly conductive member 22 and the low conductive member 21, which is composed of a fuselage highly conductive member 22 and a ceramic low conductive member 21 which are separated from each other and are separated from each other and are provided as current passing portions. An electrode of a vacuum circuit breaker in which a chromium oxide film (21b) (21c) is formed in between. 14. The disk-shaped quasi-resistive member (2b) according to claim 13 is constituted by binding a plurality of low-conductive members (21) made of ceramic with low conductivity in parallel and perpendicular to the plate surface of the quasi-resistive member (2b). And a plurality of through portions 21a and 21d provided so as to be isolated from each other in the direction, and after forming the chromium oxide films 21b and 21c on the inner circumferential surface of each of the through portions 21a and 21d, the main current An electrode of a vacuum circuit breaker, characterized by forming a highly conductive member (22) by filling copper in said through portions (21a) (21d) to form a passage portion. A pair of electrodes provided in a vacuum container by a pair of electrodes, wherein the electrode comprises an approximate disk-shaped semi-resistive member consisting of a low conductive member and a highly conductive member, and a contact formed thereon. The highly conductive member is made of a metal having lower melting point and higher conductivity than the low conductive member, and is formed in the form of molten cast metal that penetrates the low conductive member according to the thickness direction of the semi-resistive member. In an electrode of a vacuum circuit breaker which allows most of the current to flow, the semi-resistive member 2b is filled with a highly conductive material and has a honeycomb-shaped low conductive member having a plurality of balls constituting the plurality of highly conductive members 22 ( 21, and the electrically conductive member 22 described above is suppressed from forming the eddy current in the resistive member 2b which has been insulated from each other by the low conductive member 21. Rock electrode of the vacuum circuit breaker is configured. A pair of electrodes provided in a vacuum container by a pair of electrodes, wherein the electrode comprises an approximate disk-shaped semi-resistive member consisting of a low conductive member and a highly conductive member, and a contact formed thereon. The highly conductive member is made of a metal having lower melting point and higher conductivity than the low conductive member, and formed into a molten cast metal form through the low conductive member in the thickness direction of the quasi-resistive member. In the electrode of a vacuum circuit breaker which allows most of the electric current to flow, the quasi-resistive member 2b is formed in the form of a pipe in which a plurality of low-conductive members 21 on a pipe are held inside, and is formed by a low-conductive material. An electrode of a vacuum circuit breaker configured to form a highly conductive member (22) by filling an adjacent space of a pipe in which electrically conductive materials are isolated from each other.

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