JPS61110924A - 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 [Technical Field of the Invention] The present invention relates to an improvement in the structure of a vacuum circuit breaker.

[Problems with the technical background of the invention]

As is well known, a vacuum cleaner opens the contacts in a vacuum and
It is designed to cut off υ current by J4 due to its excellent insulation performance and arc extinguishing performance. In recent years, the performance of the vacuum i4@ has greatly improved, and it has gradually become possible to cut off large hidden currents (increasingly. Vacuum circuit breakers have a large capacity); it also prevents # adhesion during energization. Therefore, 1:,y
til (Cu) - bismuth (B1) material (hereinafter referred to as Cu -
Contactors made of Bi material (also called Bi material) have been used.

This conventional vacuum circuit breaker will be explained below with reference to the drawings. In FIG. 4, a vacuum container 1 is constructed by sealing both ends of an insulating tube 2 formed from a material such as glass or ceramic into a cylindrical shape with end plates 3.4 formed from a metal material. In this vacuum vessel 1, a pair of electrodes 5 and 6 made of a copper (Cu) material (hereinafter referred to as Cu material) and capable of coming into contact with and separating from them are arranged. However, 11L pole 5 is
One end is connected to the end plate 3 (integral) - 71c solid - 4
The other end of 4d17 is connected to the coil test electrode 8, and the movable current-carrying shaft is connected at one end to the end plate 4 via the bellows 9 so as to be movable in the sleeve direction. It is magnetically connected to a coil electrode 11 provided at the other end of the coil electrode 10 .

A contact 12.13 made of Cu-Bi material is fixed to the central part of these electrodes 5 and 6 (:), and this contact 12.13 has a structure that protrudes from the quadrupole surface. Note that 14 in the figure is an arc shield.However, the conventional vacuum circuit breaker C2 configured in this manner has a drawback of lacking.

(1) A contact made of Cu-Bi material,
Resistance to crushing pressure: 2nd inferior.

(2) Since current flows through the coil electrode when the coil is turned on, the temperature rise due to passage resistance at this coil electrode is high and it is difficult to conduct a large current.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a vacuum circuit breaker that does not cause welding of the electrodes and can shorten the flow of the wire at the time of input.

[Summary of the invention]

The present invention relates to a vacuum circuit breaker in which a pair of electrodes that can be freely connected and separated is disposed in a vacuum vessel configured by providing both ends (one end plate) of an insulating circular segment, with the electrodes being made of bismuth (Bi) at the center.
Copper (Cu)-bismuth (with a content of less than 1 t%)
A contact made of Bi) material is disposed, and a chromium (Cr) content of 25 to 60% by weight is placed on the outside of this contact.
By constructing an annular member made of steel (Cu) and chromium (Cr) material with coil electrodes provided on the end face, the mutual contactors come into contact with each other at the time of injection, enabling magnetic conduction in a dogtooth style. At the time of interruption, the arc moves to the annular member due to the difference in arc voltage, and a torrent flows to the coil electrode, generating a vertical magnetic field! l!
This improves LI performance and eliminates the inability to shut off due to welding.

[Embodiments of the invention]

Hereinafter, one embodiment of the vacuum circuit breaker of the present invention will be described with reference to the drawings. In addition, in some conventional vacuum circuit breakers, the fixed electrode and the movable electrode have different configurations, but in this example, both electrodes have the same configuration, so the following explanation can be used.
Perform with Nm + two.

11A and FIG. Insert and solder the L7'Cs contactor 4 part 21,
A contact n made of the same Cu-Bi material as this contact base 21, with a convex SNA inserted into the recess 21b at the top of the contact base 21 and fixed with brazing, etc., is formed in a concentric circle with this contact n. (The upper end surface is 1 to 2 mm lower than the upper end surface of the contact element B, and the claw A of 5 to 60 weight-t% (
Copper (Cu)-chromium (Cr) material (hereinafter referred to as C
A contact member made of a Cr material is inserted into the upper recess 24a, and the four electrodes are fixed with brazing or the like, and the contact member B is arranged at a distance of 1 on the back side of the electrode 24. , movable current-carrying shaft 91: electrically connected to the coil electrode 5, made of a low conductivity material such as stainless steel, with the lower part fixed to the coil electrode 5 and the upper part connected to the coil electrode 5. Is this a good spacer? It is also made of the same low conductivity material, with the lower part supported by the movable current-carrying shaft 9 and the upper part supported by the coil 4. It consists of a coil support member n fixed to the pole δ.

Here, the coil electrode west is fixed to the coil mounting part 25a on the upper part of the movable shaft 9 by brazing or the like, and has one end fixed to the arm part 25b extending in the radial direction, and the other end is fixed to the upper surface of the shaft 9. and the back side of the tumbler near the arm portion 25b and the connecting portion 25
The wiping material is fixed through the cylindrical part 25c and has a rectangular cross section (however, only the outer lower corner has an arc-shaped cleaning material). ,
- The coil support member is on the side! is supported by The coil electrode support member 27 is made of a low-conductivity material such as stainless steel, and has a base 77a that is fixed to the shaft 9 and is made of the same low-conductivity material as the base 77a, which is fixed to the shaft 9. It is composed of a plurality of support arms 27b fixed at one end of the base 27a and extending in the radial direction and arranged at equal intervals. Fixed.

Furthermore, the contact member and the electrode 24 have a contact base ■
and a hole 21 with an inner diameter 2 to 3 times larger than the outer diameter of the contact piece.
a and 22b are provided, respectively, and a gap G (1 to 1,5 lines) is formed with the contact base 21 and the contact n. At the bottom, a plurality of radially extending slits 29 are provided.

Next, the operation of the above configuration will be explained. When the operating mechanism (:) moves the movable sulfur shaft 9 and the movable shaft 9 touches the fixed foot magnet (not shown), that is, in the closed state, the current from the outer FTF5 circuit is transferred to the fixed electrode. (not shown) to the outer m circuit via the contactor 22.ffl contactor base 21 and the movable sulfur shaft 9.Here, the contactor n and the contactor base 21 are connected directly to the coil dragon 25. They do not contact each other, and since the contact n protrudes from the contact member A and the electrode and does not contact the other side, no magnetic current is applied. energized only through each contact n, each coil electrode 6
does not turn on. Therefore, in the closed state (-), the temperature does not rise due to the passage resistance of the coil electrode 50,
There is no problem in energizing the large whirlpool.

Next, when the operating mechanism moves the movable magnetizing shaft 9 in the opposite direction to the above and the movable @Gokumi is separated from the fixed electrode (not shown) and the fixed electrode (not shown) and the movable ring +jA20
Since the initial contact portion of μCu-Bi material was formed of each contact a, the pulling force of the Cu-Bi material was relatively small, and the small tripping force made it rigid and movable. Electrode beauty can be separated. Therefore, failure to shut off due to welding R does not occur. In addition, C which forms a contact member temperature on the contact surface of each contactor n by interruption
Even if a thin film of U material or Cr material is formed, since the base material of contact n is Cu--Bi material, failure to shut off due to welding can be prevented. Moreover, when the movable electric force is separated from the fixed foot tail pole (not shown), the contact η formed from Cu-Bi material
Upper (near arc occurs. Here, the cathode spot of the arc generated on the contact n remains at only one location.
Some of them also move to the contact member 23 made of Cu-Cr material, and on the anode side, the decoupled magnetons and ions are transferred to the contact n and the contact member 23 (uniformly spread 9 Therefore, the contact member B, the electrode scrap, and the 4-pole coil 25 are also energized, and at the same time (- coil (-), due to the loop magnetic current flowing through the arm part δb of the pole δ, a magnetic field perpendicular to the plane of the electrode scrap (hereinafter referred to as longitudinal magnetic field) is generated. Here, if the outer diameter of the coil electrode 5 is too small than the outer diameter of the electrode scrap, only the vertical magnetic field at the center of the 4th surface will be strong, and the magnetic field will be weaker on the outside of the coil electrode 5 and will not change in the direction. is reversed, and the arc generated between the movable electrode and the solid foot pole (not shown) spreads over the surface of the contact member n and the electrode scrap (without spreading evenly. Also,
If the outer diameter of the coil electrode δ is too large than the outer diameter of the electrode scrap,
coil! 25 The strength of the longitudinal magnetic field generated by
A longitudinal magnetic field comparable to the minimum arc voltage value in the relationship between arc magnetic pressure and longitudinal magnetic field shown in FIG. 3 cannot be obtained, that is,
It is not possible to reduce the arc voltage.

Therefore, the outer diameter of the coil electrode 5 is equal to 0 of the outer diameter of the electrode scrap.
．． Must be 5@ or more and 1.5 times or less. In order to generate a uniform longitudinal magnetic field between the movable electrode and the fixed pole (not shown), a single coil electrode is insufficient. The same coil electrodes are provided in other coils (not shown), and each coil (
Polar arc g25di = One-turn closed loop with equal constraints due to four flowing flows (the flows must be in the same circumferential direction. As shown in Figure 3, the magnetic flux density of the longitudinal magnetic field increases, As the strength of the longitudinal magnetic field increases, the arc pressure decreases to the minimum arc voltage of 1 arc, and then shows a V characteristic that gradually increases.The curved blade shown in Figure 3 is Cu
Curve 31 shows the V characteristics of the Cu-Cr material.

Contains Bi material! Less than 1% by weight of Cu-Bi material is Bi
Since the content of the material is at, the model number of the Bi material to one arc pressure is small and approximately equal to curve I. Therefore, the cathode spot moves to the contact member 23 (-), and the uniform spread on the anode side is caused by the generation of a longitudinal magnetic field due to the flow of the cargo frame particles 9, onto the contact member n made of Cu=-Cr material. The pressure on the arc that occurs is lowered, and the diffusion effect of the vertical magnetic field (Cu
- The arc further spreads onto the contact member n made of Cr material, making it possible to interrupt the flow. Normally, when the movable side core I contacts and separates from the fixed side electrode (not shown), that is, when it is turned on and off, the closing and tripping are performed with a strong compensating force. Therefore, since this strong IS force acts on the electrode 24 and the coil electrode 25, a spacer made of a low-strength material such as stainless steel is used as a supporting member to prevent the force from deforming. The lower part of the coil is attached to the coil N25 by brazing, etc., and the upper part is provided so as to come into contact with the A side of the electrode U. Further, as a support member for preventing deformation of the coil electrode 6, a coil electrode support member γ made of a low conductivity material such as stainless steel is fixed at its lower part to the movable magnetic shaft 9 by brazing, etc. The tips of the plurality of support arms 27b arranged at equal intervals in the circumferential direction and extending in the radial direction are connected to the arcuate portion 25d.
A brazing plate is provided on the back side of the plate so that the upper plate 9 is fixed to the plate. Here, the spacer and the coil electrode support member 2
Since 7 is made of a low conductivity material such as stainless steel, the magnetic current that is shunted to the spacer hole and the coil electrode support member 27 is extremely small.

Furthermore, when the contact n contacts the other contact with a strong closing force, it contracts in the axial direction (: contracts and expands in the radial direction), but a gap G is created between the contact member B and the electric image. On the other hand, the contact member has a plurality of sulins extending in the radial direction of the handle (2).
9 is provided, so that when a longitudinal magnetic field is generated, the contact member n and the electrode 2 generate a magnetic field in the opposite direction to the longitudinal magnetic field.
Flows to 4! Blocks Loog flow such as iA flow, reverse magnetic field 4
This prevents the vertical magnetic field from decreasing due to

In addition, in the above description, the circular arc portion 2 of the coil electrode 5
5d is rarely integrated, but the arc part 25d is divided into a plurality of parts that do not touch each other, and a plurality of arm parts 25b are also provided.
Both ends of each divided circular arc part 25d are fixed to the arm part 25b, and the opposite ends of the adjacent circular arc parts 25d are connected to each other via the connecting part 25c.
5d (-The flowing magnetic current is equidynamic; it may be a single-pole coil with an L-shape that forms a two-turn closed loop.

〔Effect of the invention〕

Since the present invention is constructed as described above, it has excellent flow performance, eliminates the inability to shut off due to one cap and two, and eliminates the temperature rise due to the passage resistance of the coil electrode when it is turned on, allowing for a large 1-m flow. possible.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main part of a Jc hollow cutter of the present invention, and FIG. 2 is an arrow 1 along line A-0-A in FIG.
The cross-sectional view shown in FIG. 3 shows the present invention (: related copper and copper-
FIG. 4 is a curve diagram showing the relationship between the strength of the longitudinal magnetic field of chrome and the arc magnetic pressure, and FIG. 4 is a sectional view showing the structure of a conventional vacuum J-breaker. 1...Vacuum container, 2...Insulating cylinder processing...
Movable electrode, 21...Contact member...Contact member, b...Coil electrode 27...Coil electrode support member Fig. 1 Fig. 2 Fig. 3 o o, I O, 10,
,3? ba4shii'ifkstickylambda1pu=bundle K
Figure 4 of ff

Claims (5)

[Claims] (1) In a vacuum circuit breaker in which a pair of electrodes that can be freely brought into and out of contact with each other is disposed in a vacuum container configured by providing end plates at both ends of an insulating cylinder, the content of bismuth (Bi) is A contact made of a copper (Cu)-bismuth (Bi) material with a chromium (Cr) content of less than 1% by weight is provided, and copper (Cu) with a chromium (Cr) content of 25 to 60% by weight is disposed on the outside of this contact. −
A vacuum circuit breaker comprising a coil electrode having an annular member made of chromium (Cr) material on the end face. (2) The vacuum circuit breaker according to claim 1, wherein the contactor is provided to protrude from the disc-shaped member. (3) The vacuum circuit breaker according to claim 1, wherein the coil electrode is supported on the current-carrying shaft by a support member made of a material having a lower conductivity than copper (Cu). (4) A linear slit extending in the radial direction is provided on the end face of the coil electrode including the disc-shaped member.
Vacuum circuit breaker as described in section. (5) The vacuum circuit breaker according to claim 1, wherein the pair of electrodes has substantially the same configuration.