JPS6065413A - 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 to which the invention pertains] This invention relates to a magnetic field stabilized vacuum circuit breaker [Prior art and its problems] A conventional magnetic field stabilized vacuum circuit breaker is shown in FIG. As shown, at least one of the current-carrying rods 1 is movable, and the current-carrying contacts 2 are fixed to the light end of the current-carrying rod 1.
An arc electrode 3 is arranged around the outer periphery of the current-carrying contact 2, and a spring field generating coil 4 is arranged spirally around the outer periphery of the current-carrying rod 1, which elastically holds the arc electrode 3 on the current-carrying rod I.
It is mainly composed of. Note that these electrode structures are housed in a vacuum container (not shown) to constitute a vacuum interconnector.

The operation of the vacuum circuit breaker configured in this way is as follows:
The electric circuit is in a conductive state with the lower current-carrying rod 1 moved upward. 1/' when cutting off the electrical circuit from continuity with the ,, the current-carrying rod 1 is pulled down to separate the current-carrying contacts 2, but at this time, since the surfaces of the contacts 2 are in inclined contact, a current flows through the coil 4, and a magnetic field according to the winding direction of the coil 4 is generated between them. Occurs around the kabi-. Since this magnetic flux is applied to the avoidance Mt rod 1 in the axial direction, it has the effect of completely stabilizing the arc generated at the electrode. Next, by further moving the current-carrying rod 1 downward in a state in which this arc is stabilized, the electric circuit can be interrupted without causing local abnormal arcs at the contacts 2.

However, the arc generated when the arc electrode 3 is pulled apart forms a donut-shaped central field of sunlight similar to the shape of the electrode, making stable interruption impossible. In other words, this arc is mechanically unstable, and its donut shape quickly collapses, causing it to be biased towards a part of the electrode i9 surface.

Therefore, the vacuum circuit breaker as a whole has the disadvantage that the entire surface of its electrode cannot be effectively utilized, and that it is difficult to apply an a-field and stabilize the arc.

[Purpose of the invention]

The present invention improves the above-mentioned conventional drawbacks, and aims to provide a vacuum circuit breaker that has excellent stability and reproducibility of interrupting performance and can increase current carrying capacity.

[Summary of the invention]

The present invention has a pair of electrodes that can be freely moved into and out of contact with each other in a vacuum container, and includes a bowl-shaped conductive part in which at least one of the electrodes is arranged so that an opening faces the other electrode, and a bowl-shaped conductive part in which at least one of the electrodes is arranged so that an opening faces the other electrode. a conductor connected to and led out of the vacuum container, a plate-shaped electrode disposed in a lid-like manner at the opening of the bowl-shaped conductor, and between this plate-shaped electrode and the bottom of the bowl-shaped conductive part. It is a vacuum circuit breaker with an electrode structure comprising a magnetic field generating conductor that is electrically connected, has elasticity, and is configured to generate a magnetic field, and in particular, the outer diameter of the plate electrode is bowl-shaped. This is a vacuum circuit breaker configured to be smaller or larger than the inner diameter of the opening at the bottom.

〔Effect of the invention〕

The drawbacks of the conventional method, namely, the generation of heat in the coil section only at the moment of interruption and energization, have been eliminated, and the drawbacks of the current carrying capacity have been eliminated, as well as the drawbacks of the electrode structure that impair the stability of the arc. In other words, the arc-breaking electrode is almost a flat plate, and a bowl-shaped current-carrying electrode is provided around the periphery of the arc-breaking electrode to at least eliminate the lack of a hole in the center (hole) and eliminate the fundamental instability of the arc column. , magnetic field generating coil elements for arc stabilization are provided in four parts of the bowl-shaped electrode, one of these coil elements is connected to the bottom or periphery of the bowl-shaped electrode, and the other is provided in the opening of the bowl-shaped electrode in the shape of a lid. Connect to the cut-off electrode. When the coil is turned on, both ends of the coil element are short-circuited by the bowl-shaped current-carrying electrode, which prevents heat generation in the coil and enables large-capacity current flow.

[Embodiments of the invention]

Hereinafter, an actual case of the present invention will be explained in detail in (d).

The air circuit breaker of the present invention is constructed by housing a pair of electrode structures that can be freely moved into and out of contact with each other in a vacuum container (not shown) which is evacuated to a pressure of 10 Pa or less, for example. As shown in Fig. 2, the electrode structure housed in these six empty containers consists of a pair of bowl-shaped conductive parts 5, one of which (lower side) is movable and the other (upper side) of which is fixed. A ring-shaped current-carrying electrode 6 provided at the edge of the opening of the bowl-shaped 2# conductive part 5, a plate-shaped cut-off electrode 8 arranged to cover the opening 7 of the bowl-shaped conductive part 5, and this cut-off electrode. 8 and the bottom part 9 of the bowl-shaped conductive part, and a coil-shaped magnetic field generating conductor 10 having elasticity.
and.

A conductor 11 that leads the bowl-shaped conductive part 9 out of the vacuum container, a reinforcing conductor 12 attached to the cutoff electrode 8, and a bowl-shaped conductive part 9.
With reinforcement body 13 added around the outer circumference, EIE has 1 eyebrow! has been completed.

The operation of the vacuum-shielded 11 loin yen hakama of the present invention, which has been made as described above, is carried out as follows. First, when the four electric rods 11 are raised and turned on, the circuit current follows the bowl-shaped conductor 5 via the city electric conductor 6, and flows into and out of the vacuum container into the circuit, but the coil conductor 10 is l'6tf. Since there is a bowl-shaped short body 5, this current flows and there is no heat between the coils. When the conductive rod 11 is cut off, it is carried out by lowering the conductive rod 11 downward, but as the rod 11 falls, the current-carrying electrode 6 first separates and an arc is generated on its surface m1. However, at this point, the cutoff 1 crazy pole 8 is in contact again, so the circuit current flows from the upper current-carrying rod 11 to the coil conductor 1.
0 → Reinforcing conductor 12 → Breaking electrode 8 → Lower breaking electrical connection 8
The main current flows in the order of → reinforcing conductor 12 → coil conductor 10 → current-carrying rod 11, and since the current flows between the current-carrying electrodes and disconnects them, the arc that has been generated on the surface of the current-carrying electrodes disappears. Next, when the current carrying rod 11 is further lowered, the cutoff electrode 8 is separated, and an arc is generated on the surface of the supply and cutoff electrode. This arc is generated in a substantially uniform distribution over the entire surface of the electrode due to the action of a stabilizing magnetic field (axial magnetic field) generated by the coil conductor 1o, which is a magnetic field generating element. The arc stabilized in this way is cut off at the current zero point when the conductive rod 11 is further lowered. Therefore, 1° of the coil conductor is not heated,
The circuit can be broken by stabilizing the arc generated between the electrodes, improving its performance as a vacuum circuit breaker.

[Other embodiments of the invention]

Next, other embodiments of the present invention will be described. Note that the same components will be described with the same reference numerals. - The electrode structure shown in FIG. 3 is housed in a vacuum container (not shown) as described above. The opening 7 of the bowl-shaped conductor 5 has its opening 7
A plate-shaped cutoff electrode 15 is placed so as to cover with a gap 14.
is provided on the coil conductor 10. That is, this cutoff electrode 15 is formed so that its outer diameter is larger than the inner diameter of the bowl-shaped conductor 5. However, for practical purposes, its outer diameter is the same as the outer diameter of the bowl-shaped conductor 5, but it may be larger or smaller, as long as it is at least larger than the inner diameter. The cutoff electrode 15 may be made of the same material, or may be attached to a reinforcing conductor 16 as shown in FIG. Reinforce the ring-shaped contact electrode 17 slightly opposite the current-carrying electrode 6 of the bowl-shaped conductor 5! It is provided around the electric body 16 and electrically connected to it.

The vacuum circuit breaker constructed in this manner operates as follows. At the time of turning on, the current is passed through and introduced from the outside, and the bowl-shaped conductor 5 is energized, the current-carrying contact 6, the cutoff electrode 15, the current-carrying contact 6,
It passes through the bowl-shaped conductor 5, passes through the other opposing current-carrying rod 11, and flows out to the outside. At this time, the coil conductor 10, which is a magnetic field generating element, is in a substantially short-circuited state, and almost no current flows through the coil conductor 10, so no heat is generated.

At the time of interruption, the current-carrying electrode 6 is first separated and an arc is generated. But blocking? Since l'1-t15 is still in close contact, the current flows through the coil conductor 10fK:, and the energizing type 'jFf
The arc generated between i6 and the contact 17 of the cutoff 11\pole 15 is immediately extinguished. Next, the interrupting electrode 15 opens and an arc is generated. This arc is stabilized by the stabilizing magnetic field (axial magnetic field) generated by the magnetic field generating element 10 and is distributed almost uniformly over the entire surface of the electrode 15. The arc generated between this electric current and the current zero point t is interrupted.The difference between the embodiments shown in FIGS. 2 and 3 is that the one shown in FIG. In contrast to the contact part of the current-carrying electrode and the contact part of the breaking type (sand), which are connected in parallel, in Figure 3, the two current-carrying contact parts and the contact part of the breaking electrode are connected in series. It is.

In each of the embodiments described above, one magnetic field generating element (coil conductor) is shown for one electrode, but the effect does not change even if two or more magnetic field generating elements (coil conductor) are connected in parallel. The structure of the coil conductor is a cylindrical coil, but the effect is the same even if it is a planar coil.

The material of the magnetic field generating coil conductor is preferably stainless steel, Inconel, etc., which do not lose their elasticity even when heated to low temperatures. Furthermore, a composite material of the elastic material and a conductive material such as copper may be used to increase the current carrying capacity (instantly when the current is interrupted).

Bowl-shaped current-carrying conductor 5. Alternatively, the cutoff electrodes 8 and 15 are not limited to being made of a single metal, but may be provided with suitable reinforcing members 12, 13, 16e made of stainless steel or the like.

Further, it is desirable to provide appropriate grooves (not shown) in the cutoff electrodes 8, 15 or the current-carrying rod 11 in order to reduce the short-circuiting effect of magnetic flux.

In addition, suitable materials are used to increase the distribution and strength of the generated magnetic field.
Even if the shaped ferromagnetic body 18 is provided, the effects of the present invention are not impaired.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a part of a conventional vacuum circuit breaker, FIG. 2 is a sectional view showing a main part of a vacuum circuit breaker according to the present invention, and FIG. 3 is a main part of another embodiment of the present invention. FIG. 5... Bowl-shaped conductor, 6... Current-carrying electrode, 8... Cutting-off electrode, 10... Field generation device (coil conductor), 11... Current-carrying rod. Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) In a device having a pair of electrodes that can be freely brought into contact and separated from each other in an empty container A, at least one of the electrodes is arranged such that the opening faces the other electrode, and the bowl-shaped conductive part a conductor connected to the conductor and led out of the vacuum vessel; a plate-shaped electrode disposed in a lid-like manner at the opening of the bowl-shaped conductor; and between this plate-shaped electrode and the bottom of the bowl-shaped conductor. and a magnetic field generating conductor that is electrically connected to the contact point, has elasticity, and is configured to generate a magnetic field within a range where the bowl-shaped conductive part does not come into contact with the other contact. Vacuum circuit breaker. (2) The vacuum circuit breaker according to claim 1, wherein the outer diameter of the plate electrode is smaller than the inner diameter of the opening of the bowl-shaped conductive part. (3) Platy? l? 2. The vacuum circuit breaker according to claim 1, wherein the outer diameter of the pole is larger than the inner diameter of the opening of the bowl-shaped conductive part.