JPS6188414A - Vacuum circuit breaker electrode - 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 [Field of Industrial Application] This invention relates to an electrode for a vacuum circuit breaker configured to generate a magnetic field substantially parallel to an arc.

[Conventional technology]

As electrodes for vacuum circuit breakers, the one shown in Japanese Patent Publication No. 47-30786 has been proposed, and because the electrodes are not configured to apply a magnetic field parallel to the arc, the breaking performance cannot be improved. .

7 and 8 show conventional vacuum breaker electrodes that generate a magnetic field parallel to the arc. In the figure, (1) is a conductive rod, (2) is a conductive rod (the arm extends radially from the base of 11, passes through one turn of the coil, reaches the arc electrode (3) via the connection part (4)) It is a coil electrode. (5) is a spacer made of non-magnetic and high resistance metal. (Al is an arc generated between the counter electrode (not shown), and (1) is a current flowing at that time, which is indicated by an arrow. The current path is shown.

Next, the operation will be explained. The arc (Al) generated on the arc electrode (3) causes the current (1) to flow to the connection part (4).
Through the current path that flows into the one-turn coil formed by the coil electrode +21 and reaches the conductive rod (1),
Arc (generates a magnetic field parallel to Al).

This magnetic field uniformly disperses the arc (Al) on the surface of the arc electrode (3) as countless thin thread-like arcs,
This is an attempt to extinguish the arc.

[Problem that the invention seeks to solve]

Conventional electrodes were constructed as described above, but because the coil is formed at the outer periphery of the coil electrode (2), it has the disadvantage that it inevitably results in uneven magnetic field distribution in the radial direction. In addition, since the current path is limited by the connection part (4) and the coil electrode (2) and the distance is long (2), there is a drawback that the internal resistance is large and overheating occurs when a large current is applied.

Furthermore, since the arc electrode (3) is thin, it has low mechanical strength, has a complicated structure, and is expensive.

This invention was made in order to solve the above-mentioned problems, and it is possible to obtain a uniform or arbitrary magnetic field distribution in the radial direction to improve the interrupting performance, as well as to increase the current capacity (and easily The purpose is to obtain an inexpensive vacuum circuit breaker electrode with a high mechanical strength structure.

[Means for solving problems]

In the electrode of the vacuum circuit breaker according to the present invention, the first wire is formed of a wire whose outer periphery is covered with a coating member having low electrical conductivity,
A plurality of first strands are bundled and twisted to form a second strand, and an arc electrode is arranged at the tip of the second strand.

[Effect]

The electrodes of the vacuum circuit breaker in this invention generate an arc (magnetic field in a parallel direction) by the current flowing through the wire.

[Embodiments of the invention]

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

In Figures 1 and 2, (61 is a main component wire made of a highly conductive material, (7) is a first wire that covers the main component wire (6), and has a lower electrical conductivity than this wire (6). The wire rod (6) and the covering member (7) constitute the first strand (8).(9) is a covering member made of sub-components of After bundling, the second strand is shaped like a spiral (two-twisted roughly coiled wire. +21 is the second strand (9)
It is a coil electrode constructed by bundling multiple pieces. (3) is an arc electrode provided to cover the upper surface of the coil electrode (21). (101 is a conductive rod (11) and a coil electrode (21).
) is a connecting plate made of a highly conductive material and installed on the bolt.

Since the present invention is configured as described above, the conductive rod [1
The current (1) supplied from connection plate 001. The current flowing through the coil electrode (21) is passed through the arc electrode (31), but most of the current flowing through the coil electrode (2) is passed through the coating member (7).
In this case, since the second strand (91) is roughly coiled, it has a spiral shape, so the wire +6+ +=
The flowing current also draws a spiral shape, and therefore a magnetic field component is generated in the axial direction, that is, parallel to the arc, and the arc (A
) can be dispersed on the surface of the arc electrode (3),
It is possible to improve the interrupting performance.

Furthermore, since the entire surface of the electrode serves as a current path, the electrode structure has a large current capacity without fear of overheating. moreover,
By changing the degree of twist of the second wire (9) (-therefore, an arbitrary magnetic field strength can be obtained), and by combining the second wires (91) with different degrees of twist to form an electrode. By doing so, an arbitrary magnetic field distribution can be obtained.

Furthermore, since the arc electrode (3) and the coil electrode (21) are in close contact with each other, the mechanical strength is high.

Further, in the above embodiment, the coil electrode (2) was constructed by combining a plurality of second wires (91), but as shown in FIGS. 3 and 4 (2), the second wire t91 The coil electrode may be composed of a single coil electrode. In this case, although an arbitrary magnetic field strength distribution cannot be obtained, the structure becomes simpler.Furthermore, as shown in Fig. 5, the linear member may be formed of a wire rod. Furthermore, as shown in FIG. Insert the first strand (8
) may be filled with a filling member αυ having a lower melting point than the filling member αυ. With the same idea as shown in FIG. 8, the coil electrode (2) may be constructed by combining a second wire (9) with a different diameter, The gap may be filled with a filling member (11) having a melting point lower than that of the first wire (8).

〔Effect of the invention〕

As described above, according to the present invention, the outer periphery of the wire is covered with a coating member having low electrical conductivity, and a large number of wires are bundled and twisted in a spiral to form a coil electrode, thereby generating a magnetic field approximately parallel to the arc. Therefore, any magnetic field strength and any magnetic field strength distribution can be obtained, and the interruption performance can be improved. Further, it has the effect of obtaining a simple electrode structure with a large current capacity and high mechanical strength.

[Brief explanation of drawings]

Figure 1 is a front view of an embodiment of this invention, Section 2 is a cross-sectional plan view taken along the line ■--■ of Figure 1, Figure 3 is a front view of an embodiment of this invention, and Figure 4 is Figure 3. IV-IV cross-sectional plan view of 5th
FIG. 6 is a plan view of a first wire whose covering member is made of a linear member, and FIG. 6 is a plan view of a second wire which is made of first wires having different diameters. Fig. 7 is a front view of the electrode of a conventional vacuum circuit breaker, Fig. 8 is a plan view of Fig. 7, in which (3) is the arc electrode, (6) is the wire, (7) is the covering member, (8 ) is the first strand, +91 is the second strand, and υ is the filling member. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (7)

[Claims] (1) In a device that is placed in a vacuum container and whose contact surfaces are abutted, the outer periphery of a highly conductive wire is covered with a covering member having lower electrical conductivity than the wire to form a first element wire, and the A second strand is formed by bundling a plurality of first strands and twisting them into a spiral shape, and an arc electrically connected to the second strand so as to cover the tip side of the second strand. An electrode for a vacuum circuit breaker, characterized in that an electrode is provided and the rear end side is electrically short-circuited. (2) The electrode for a vacuum circuit breaker according to claim 1, wherein the number of the second strands is one. (3) The electrode for a vacuum circuit breaker according to claim 1, characterized in that the second wire has a plurality of pieces. (4) The electrode for a vacuum circuit breaker according to claim 3, wherein the second wire has at least two different degrees of twisting the first wire. (5) The electrode for a vacuum circuit breaker according to claim 3, wherein the second wire has a circular cross-sectional shape and includes a plurality of sets having mutually different diameters. (6) The vacuum circuit breaker according to any one of claims 1 to 6, characterized in that the first wire has a circular cross-sectional shape and there are a plurality of sets having different diameters. electrode. (7) In a device that is placed in a vacuum container and whose contact surfaces are abutted, a first strand is formed by covering the outer periphery of a highly conductive wire with a covering member having lower electrical conductivity than the wire; A second strand is formed by bundling a large number of strands of strands 1 and twisting them into a spiral shape, and a filler having a lower melting point than that of the first strand is filled between each of the second strands. 2. The electrode for a vacuum breaker according to claim 1, wherein the contact surface is formed on the leading end of the wire, and the rear end is electrically short-circuited.