JPS59169013A - 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 in particular to a vacuum interrupter in which means are provided behind the tlL pole for generating an axial magnetic field, sometimes parallel to the arc.

In recent years, by applying an axial magnetic field parallel to the arc, the arc is dispersed on the electrode surface, preventing its local concentration, and thereby improving the breaking performance by preventing excessive melting of the electrode. A so-called vertical magnetic field type vacuum interrupter is known, which aims at A cap-shaped disk-shaped electrode consisting of a contact part and an arc diffusion part is mechanically fixed to the inner end of the electrode with an insulating spacer interposed, and each electrode and the inner end of the electrode rod are arranged on the back of the electrode. It is electrically connected by a coil that converts the axial current flowing through the electrode rod into a loop current centered around the electrode rod to generate an axial magnetic field.

However, the electrodes of the conventional vertical magnetic field type vacuum interrupter are made of Ou and Ou containing 0.5 weight factor of B1 (hereinafter referred to as "0u-0.5Bi alloy"), which has a relatively high electrical conductivity (approximately 100% conductivity), or 20%
EU for the weight clerk and W for the 80 heavy wage clerk (hereinafter "200u -3
QW alloys with relatively low conductivity (20 to 3
0104 area ratio) as a single material.

However, in the case of the former (3u and 0u-0,5Bi alloys), due to the high conductivity, the generation of eddy current becomes noticeable, leading to a decrease in the strength of the axial magnetic field, and We are trying to solve this problem by providing multiple slits.

However, the electric field is concentrated at the edge of the slit, resulting in a decrease in the dielectric strength of the current cutter and the dielectric strength after the cutoff.Especially in the case of eu-0,5B1 alloy, its vapor pressure is high, so the current cutter The dielectric strength of the blade after cutting is reduced by -), and the multiple slits cause a reduction in mechanical strength.The current cutting value is as high as IOA, so it can handle small currents well. There is an issue that cannot be resolved.

In addition, in the case of the latter electrode made of 200u-80W alloy, it has low conductivity, so it generates little eddy current, has relatively high mechanical strength, and has high static dielectric strength, but dynamic There is a problem that the dielectric strength is low and the cutting edge of the large current is low.

The present invention has been made in view of the above-mentioned problems, and its purpose is to form the contact part of the sliding door with an Ou'Or-Mo alloy having a coefficient of conductivity of 20 to 60, and to form the arc diffusion part. By forming the material from a material having a conductivity of 10 to 20 C4O4 and containing at least Ou, Fe, and Or, it has excellent mechanical strength, dielectric strength, and large current cutting edge, and can also cut small currents well. The purpose of the present invention is to provide a vacuum interrupter using a vertical magnetic field method.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the vacuum interrupter according to the present invention has a pair of electrode frames 2, 2 positioned on the axis of the vacuum chamber 61 and introduced so as to be able to approach and separate from each other. 2
A pair of ``1Z43.3'' shaped like a hat-shaped disk are mechanically fixed to the inner end of the ``ia electrode 3'' with an insulating spacer interposed therebetween. The current flowing in the axial direction (vertical direction in Fig. 1) flowing through the electrode rod 2 is changed into a loop current centered on electrode #2, and electrically connected by a coil 5.5 that generates an axial magnetic field. It is configured.

That is, the vacuum container 1 includes thin annular sealing fittings 6, 6, . . . . are joined together to form a single insulating cylinder, and both open ends thereof are closed by disc-shaped metal end plates 7, 7 via the other sealing N fittings 6, 6, and It is formed by evacuating the inside to a high vacuum. Each of the electrodes #2 is introduced into the vacuum vessel 1 from the center of each metal end plate 2 so as to be able to move toward or away from each other at will while maintaining the airtightness of the vacuum vessel 1.

Note that one electrode rod 2 (upper in FIG. 1) is hermetically joined to one metal end plate 7, and the other electrode rod 2 is connected to the vacuum vessel 1 airtightly through a metal bellows 8. It is inserted so that it can move freely in the axial direction while maintaining its properties. Further, in FIG. 1, 9 and 10 are a shaft shield and a bellows shield, 11 is a king shield, and 2 is an auxiliary shield.

As shown in FIGS. 2 and 3, at the inner end of each of the electrode rods 2, there is a disk-shaped mounting base 4a having an appropriately larger diameter than the electrode rod 2r, and a mounting base 4a on the outer periphery of the mounting base 4a. Two ridges 4b extend outward in the radial direction (horizontal direction in FIG. 2) from opposing positions, and a circle extends from the end of the valley ridge 4b in the same circumferential direction around the mounting base 4a. A two-turn coil 4 made of a highly conductive material such as Ou is connected to the mounting base 4a through four parts 13 formed on one surface (lower surface in FIG. 2) of the mounting base 4a. The coil 4 has a ring-shaped mounting part 14a fitted to the outer periphery of the inner end of the electrode rod 2 by brazing, and a ring-shaped mounting part 14a that is radially outward from the outer periphery of each mounting part 14a. A ring-shaped support part 14 that connects the end of each support arm 141) with a number of support arms 14 extending radially in the direction.
c, and a coil complement 1 made of a material with high mechanical strength and low conductivity, such as stainless steel.
4 and reinforced with wax examples.

A circular recess 15 is provided on the other surface of the mounting base 4a of the front coil 4, and this recess 15 is made of a material that is mechanically strong and has low conductivity, such as stainless steel or Inconel. Insulating spacer 16 formed into a short circle shape using a material
is attached by brazing through a small diameter 7 flange 1.6 formed at one end.

The large diameter 7 flange +61) formed at the other end of the insulating spacer 15 is provided with a transparent material having a diameter 4 times larger than the large diameter flange 16b and having the same diameter as the inner diameter of the spacer 16. a ring disk-shaped mounting base 17a having a hole;
Two arms 17. extend radially outward from opposing positions on the outer periphery of the mounting base 17'a. b, and each arm 1.
71) from the end of the coil 4 with a radius of curvature that is almost the same as that of the circular arc part 4c and an appropriate length in the same circumferential direction opposite to the direction of curvature [consisting of a curved circular arc part 17Q] An adapter 17 made of a highly conductive material such as copper is fitted by brazing through a recess 18 provided on one surface of the mounting base 17a. The adapter 17 is used to connect the electrode 3 and the coil 4 at once near the center of the back surface of the electrode 3, and one end of the adapter 17 is connected to a recess 19 provided at the end of each arcuate portion 4c by brazing it into a energizing bottle. An axial through hole 2 with the other end of 20 provided at the end of the arc portion 4C of the coil 4
1 by brazing, it is electrically connected to the coil 4.

In the adapter 17, the electrode 3, which is formed to have approximately the same diameter as the coil 4, is fitted to the mounting base 17a through four parts 22 provided at the center of the back surface, and is attached to the mounting base 17a1 by brazing. The electrode 3 is connected to each arm 17b and the arc portion 17Q.
The arc diffusion part 3a has a circular concave part 23 in the center (upper surface in the figure) and is formed in the shape of a hat-shaped disk that gradually becomes thinner as it approaches the periphery, and has a circular contact surface on the opposing surface and as it approaches the periphery. The contact portion 3b is formed into a cap-shaped disk shape that becomes gradually thinner, and is fitted into the concave portion 23 of the arc diffusion portion 3a by brazing, so that the arc diffusion portion 3a has a cap-shaped disk shape as a whole. And, the arc diffusion part 3a is 10~
A material having a conductivity of 20 parts (preferably 10-15 parts) and containing at least C, Fe and Or, such as a material having a tensile strength of about 306 parts by weight and 50 parts by weight of O and 50 parts by weight. It#j austenitic stainless steel (SNS27 or S[TS32) composite (hereinafter [5
Complex J of 00u-50SUs) -1f,=
It is made of 6-150 weight factor Aus 25 weight factor Fe and 25 weight factor Or gold alloy, and
The contact part 3b is 20-70 f ou, 5-70 f
Consisting of Or of ig and Mo of 5 to 70 persons in charge, 20
~601(1')1411. and 0u-0,5
Ou-Or-Mo has contact resistance comparable to Bi alloy
It is made of alloy.

In addition, in order to reduce the generation of eddy current, the contact portion 3b is
Its diameter is iii: i20 to 6 of the arc diffusion part 3a.
In addition, the thickness of the electrode 3 needs to be relatively thin, about 10 μm or less, in consideration of heat generation during energization.

Therefore, the vertical magnetic field type vacuum interrupter according to the present invention is equipped with electrodes in which the arc diffusion part is made of a 500u-50SUS composite and the contact part is made of an Ou-Or-Mo alloy, and an 0u-0,5B1 alloy. A comparison of various performances with a conventional vertical magnetic field vacuum interrupter equipped with a vL pole made of a single material revealed the following results.

I) Large current interrupting ability In Figure 4, which shows the interrupting limit under 84KV conditions, the horizontal axis shows the electric/water diameter and the vertical axis shows the current limit. As shown in A and the conventional one by straight line B, the one of the present invention improved the correlation by about 2 to 2.5 times compared to the conventional one.

Dielectric strength: The dielectric strength of the conventional one at a gap of 10 m is equal to that of the present invention at a gap of 311!11, and the dielectric strength of the present invention is about three times that of the conventional one.

Has dielectric strength.

In addition, the 4F absolute withstand strength before and after the large DC current cutoff is about 20 factor lower than that of the present invention when the withstand voltage between the electrodes before the large DC cutoff is 100%. Since the conventional one has a decrease of about 70 coefficients, the one of the present invention is definitely superior.

111) Welding resistance The product of the present invention has a resistance of 80 yen compared to the conventional product, but there is almost no problem in practical use, and if necessary, the tripping force at the instant of electrode separation may be slightly increased.

IV) Delay and lead small current cutoff capacity■Late small current cutoff ability The current cutoff value of the device of the present invention is as small as 40 times the current cutoff value of the conventional device, so cutoff surges are hardly a problem. The value does not change even after opening and closing 4 times.

■ Advance small current cutting ability The device of the present invention can cut off a load with twice the capacitance capacity compared to the conventional device.

As described above, the present invention introduces a pair of electrode rods into a vacuum container so that they can approach and separate from each other, and a cap-shaped disk-shaped structure comprising a contact part and an arc diffusion part at the inner end of each electrode rod. 'The electrodes are mechanically fixed, each of the electrodes and an electrode rod are arranged on the back of the electrode, and the current flowing through the electrode rod is changed to a loop current centered around the electrode rod to generate an axial magnetic field. In the vacuum interrupter which is electrically connected to each other by coils, the contact portion of the electrodes is formed of an Ou-Or-MO alloy having a low conductivity of 20 to 60, and the diffusion portion is formed of an Ou-Or-MO alloy having a low conductivity of 10 to 60. Since it is made of a material that has a conductivity of 20% and contains at least Ou, Fθ, and Or, it is possible to reduce the generation of eddy current, and there is no need to provide slits like in conventional books. This combination of the fact that the arc diffusion part is made of a material with high tensile strength, and that the mechanical strength of the entire electrode can be greatly improved. Furthermore, since the contact portion is made of an Ou-Or-Mo alloy, the dielectric strength can be greatly increased, and both large Ka and small currents can be effectively interrupted.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a vacuum interrupter according to the present invention, FIG. 2 is a vertical sectional view of main parts of the present invention, FIG. 3 is an exploded perspective view thereof, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Vacuum vessel, 2...'FII pole rod, 3... Electrode, 3a... Arc diffusion part, 3b... Contact part, 4...
...Coil, 16...Insulating spacer, 17...Adapter.

Claims (1)

[Claims] (1) In a vacuum vessel, a pair of ゛tun winds are relatively approached and separated from each other as fE (F), and a cap shape consisting of a contact part and an arc diffusion part at the inner end of the pole is ``4fTh''. A disc-shaped electrode is mechanically fixed, each of the above-mentioned 1 keyaki and electric rod are arranged on the back of the electrode, and the current flowing through the pole rod is changed to a loop current centered around the electrode rod. In the vacuum interrupter, each of which is electrically connected to a coil that generates an axial magnetic field, the electrode contact portion is formed of Ou-Or-Mo@gold having a low conductivity of 20-60. A vacuum interrupter, characterized in that the arc diffusion part is formed of a material having a conductivity of 0 to 20 cm and containing at least 40 u, Fe, and Or.