JPS6357899B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode structure for a vacuum circuit or disconnector, and more particularly to an electrode structure having means for generating a magnetic field in a direction parallel to an arc by itself. It has been well known that applying a magnetic field parallel to the arc of a vacuum shear breaker improves its shearing performance, and as a means to achieve this, a coil electrode is placed behind the main electrode. The method used was to generate a magnetic field parallel to the arc using a current flowing through the coil electrodes.

Conventional electrode structures were constructed as described above, requiring a complex structure in which the main electrode and coil electrode are mechanically connected while electrically insulating them, and which also requires a complex structure that mechanically connects the main electrode and coil electrode while electrically insulating them. , a rigid structure was required to withstand the mechanical impact forces generated when opening and closing. In addition, since the magnetic field parallel to the generated arc is a magnetic field that penetrates the main electrode in the thickness direction, eddy currents flow inside the electrode, and the resulting magnetic flux in the opposite direction reduces the parallel magnetic field required for the arc. There were negative effects. For this reason, all conventional devices that have been put into practical use have a large number of grooves on the main electrode to suppress eddy currents, and as a result, the mechanical strength of the main electrode itself is significantly reduced. Reinforcement material made of high-resistance metal was required.

Despite taking such complicated and expensive measures, in the conventional method, the coil electrode is located behind the main electrode and is far away from the arc generation point, so the effective magnetic field strength and In order to do this, the coil electrode must generate an extremely large magnetic field, which has the essential drawback that the effects of the electromagnetic force and eddy current described above become even more serious.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.
The electrode itself generates a magnetic field parallel to the arc in the immediate vicinity of the arc through the current path partitioned by the groove, which eliminates the need for a coil electrode, provides excellent mechanical strength, and is inexpensive and free from the effects of eddy currents. The purpose is to provide a vacuum breaker and disconnector for the electrode structure.

An embodiment of the present invention will be described below with reference to the drawings. Figure 1a is a side view of only a pair of electrodes facing each other, Figure 1b is a side view of the pair of electrodes facing each other; - It is a two-arrow view.

Reference numerals 1 and 6 designate conductive rods, which are mechanically connected to electrodes 3 and 4, respectively, by reinforcing materials 11 and 61 made of high-resistance metal such as stainless steel. The current-carrying conductors 2 and 5 are connected to the electrodes 3 and 4 from the bases of the conductive rods 1 and 6 through the connection parts 21 and 51, respectively.
and are electrically connected to each other, and are arranged symmetrically about the electrode axis. The electrodes 3 and 4 are provided with a wire that penetrates through their wall thickness, cuts the outer periphery of the electrode at one end, and terminates at the other end 311, 321, 331, 341, 411,
Grooves 31, 32, 33, 34, 41, 42, 43, 4 in which 421, 431, 441 reach near the outer periphery
4 are provided parallel to each other. The electrodes 3 and 4 are arranged so that the respective grooves are in opposite directions, and as shown in FIG. 3 and 4 have exactly the same structure, but are opposed to each other at 180° with respect to the center of the electrode.

Since the structure is as described above, both electrodes 3,
When an arc caused by current i occurs at arc leg points A-B and CD between 4 and 4, the current i will be
As shown by the arrow c, the conductive rod 1 passes through the current-carrying conductor 2, passes through the connection part 21, reaches the electrode 3, passes through the guide path partitioned by grooves 31 and 32, and then reaches the outer periphery of the electrode 3 on the opposite side. The current component i ₁ flows into the arc leg point A and the current component i ₂ flows into the arc leg point c. The current i ₁ reaches the arc leg point A through the guide path partitioned by the grooves 31 and 33, and flows through the arc plasma to the other arc leg point B of the opposing electrode 4. From arc leg point B, groove 4
1, 43, goes around the terminal end 411 of the groove 41, merges with the current i ₂ flowing from the leg point D of the other arc, and flows into the grooves 41, 42.
It reaches the connection part 51 through the passage partitioned by the , and reaches the conductive electrode 6 through the current-carrying conductor 5 . That is, 21→311→A,B-411 due to current i ₁
→ 51 current paths, and similarly 21 due to current i ₂
→321→341→C, D→441→421→5
Each current path in No. 1 is in the form of a coil with 1 to 1.5 turns, so a magnetic field parallel to the arc is generated, and its strength is extremely large due to the close current flowing through the electrode itself, which makes the arc stable and uniform. Effectively affects distribution. In addition, the magnetic field is generated surrounding each groove, and eddy currents are effectively suppressed by the grooves themselves, so there is an advantage that special eddy current countermeasures as in the conventional method are not required. In addition, in the electrode structure of the present invention, when closed, the current inside the opposing electrodes flows in the same direction, for example, in a path partitioned by grooves 31 and 32 and a path partitioned by grooves 41 and 42. Therefore, the electrodes are attracted to each other by the electrode attractive force generated by the parallel currents, which also has the effect of increasing the contact pressure between the electrodes. Therefore, it has become possible to significantly reduce the electrode contact force applied from the outside compared to the conventional structure.

In the above embodiment, the grooves provided in the electrodes were shown in the same direction, but as shown in FIGS. 2a and b, the grooves 31 and 33 and 32 and 34 were arranged in opposite directions. Even if it is provided, the same effect can be obtained. In this case, the direction of the magnetic field generated between the grooves 31 and 41 and the direction of the magnetic field generated between the grooves 33 and 43 have opposite polarities. Just to be sure, Figure 2 a is a view from the E-Lo arrow in Figure 1,
FIG. 2b corresponds to the view in the direction of the Harney arrow in FIG. 1, and the same applies to other embodiments hereinafter.

In addition, as shown in FIGS. 3a and 3b, the connecting portions 21 and 51 of the current-carrying conductors are connected to the terminal ends 31 of the grooves 31 and 41.
A similar effect can be obtained even if it is provided between 1,411 and the outer peripheral portion. In this case, the electromagnetic attractive force in the central current path as shown in Figures 1 and 2 becomes slightly smaller, but no magnetic field is generated parallel to the arc only between the central grooves 31 and 41. , which has characteristics that occur immediately beside it.

Note that in both the above examples, the current-carrying conductors 2 and 5
and the grooves 31, 41, . . . are arranged in the same direction, but as shown in FIG. 4
A similar effect can be obtained even if 2 and 43 are arranged so as to be perpendicular to each other. In this case, since all the current flows through the passages partitioned by the grooves, it is possible to obtain larger electromagnetic attractive force and stronger magnetic field.

Furthermore, similar effects can be obtained with electrodes having the structures shown in FIGS. 5, 6, and 7.

Fig. 5 shows the case where the current-carrying conductors 2 and 5 in Fig. 4 are arranged in the same direction, Fig. 6 shows the case where the groove is formed by a curved line with curvature, and Fig. 7 shows a case where the current-carrying conductors 2 and 5 in Fig. 4 are arranged in the same direction. In either case, a magnetic field parallel to the arc generated on the electrode surface is generated, and various effects similar to those described above can be obtained.

As described above, the vacuum breaker according to the present invention has grooves in the electrode itself to allow the arc current to flow along a path determined by the grooves, and to create a magnetic field parallel to the arc in the vicinity of the arc. This has the effect of improving mechanical and electrical properties.

[Brief explanation of the drawing]

1A and 1B are structural views of a pair of electrodes according to an embodiment of the present invention, in which a is a side view, b is a view taken along the E-L arrow, and c is a view taken along the H-Arn arrow. FIGS. 2 and 3 are views showing other embodiments of the present invention, in which a shows a view in the direction of the E-L arrow, and FIG. 3 shows a view in the direction of the HARNY arrow, respectively. Figure 4, Figure 5,
Figures 6 and 7 are views showing other embodiments of the present invention, in which a is a side view, b is a view in the direction of the arrows, and c is a side view.
shows a view from the Harney arrow. 1, 6... Conductive rod, 2, 5... Current conductor,
3, 4... Electrode, 11, 61... Reinforcement material, 21,
51... Connection part, 31, 32, 33, 34, 4
1, 42, 43, 44... groove, 311, 321,
331, 341, 411, 421, 431, 44
1...The end of the groove. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A vacuum circuit breaker which is installed in a vacuum container so as to be freely accessible and detachable, and which opens and closes an electric circuit by means of one and the other electrodes respectively attached to a conductive rod, in which one end of the above-mentioned one electrode is connected to the outer peripheral part of the electrode. A plurality of grooves are provided, the other end of which extends from the cutting part to the vicinity of the outer periphery of the electrode, and the other electrode in the state of facing the one electrode corresponds to each groove of the one electrode. A cutting part for cutting the outer peripheral part of the other electrode is provided in the extending direction near the outer peripheral part of the one electrode, and the cutting part extends from the cutting part in the direction of the cutting part of the one electrode to cut the outer peripheral part of the other electrode. a plurality of grooves reaching the vicinity of the outer periphery of the electrode, a connecting portion connected to the vicinity of the periphery of each of the electrodes, and a current-carrying conductor electrically connected to each of the current-carrying rods; Each connection portion is connected to at least one of the plurality of grooves provided in the one and the other electrodes.
A vacuum cutter characterized by being placed near the cutting part of two grooves.