JP2012248379A - Vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum circuit breaker which is of a type having two sets of longitudinal magnetic field coils disposed outside a vacuum vessel, yet can generate a uniform longitudinal magnetic field with a simple construction.SOLUTION: To achieve the above objective, the present invention offers a vacuum circuit breaker, in which two sets of coils for generating a magnetic field in a direction perpendicular to a contact electrode end face at electric conduction time are installed outside a vacuum vessel, each of the two sets of coils being connected at one end to a fixed side electrode and connected at the other end to a movable side electrode. The two sets of coils are arranged alternately without overlapping each other on the periphery of the vacuum vessel.

Description

  The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker suitable for power use, having a longitudinal magnetic field generating coil outside a vacuum vessel.

  In general, a power circuit breaker is a device arranged in a power transmission / distribution and power distribution system, and plays a role of separating a specific portion from the power system as necessary.

  In particular, the vacuum circuit breaker is designed to turn on or off a current by contacting and separating a pair of contact electrodes arranged inside a vacuum vessel, and a magnetic field perpendicular to the contact electrode end face (hereinafter referred to as a longitudinal magnetic field). It is widely known that the blocking performance is improved by applying.

  Such longitudinal magnetic field type vacuum circuit breakers are roughly classified into those provided with a coil in the electrode inside the vacuum vessel and those provided with a coil outside the vacuum vessel.

  Compared to the former, the latter produces a uniform longitudinal magnetic field over a wide range, simplifies and reduces the weight of the electrode, reduces the axial dimension of the vacuum vessel, and reduces the magnetic field attenuation associated with the opening of the electrode pair. It has characteristics such as absence.

  Patent Document 1 discloses a vacuum circuit breaker provided with a coil outside the latter vacuum container. The vacuum circuit breaker described in Patent Document 1 has a coil for generating a vertical magnetic field outside the vacuum vessel, and includes a movable side holder, a movable side contact, a fixed side contact, an external coil, a folded electrode, and a fixed side holder. A current flows through the path.

  On the other hand, there is Patent Document 2 as a vacuum circuit breaker having two sets of coils outside the vacuum vessel. The vacuum circuit breaker described in Patent Document 2 is shown in FIG. 1 in which a coil is disposed on each of both axial end plates outside the vacuum vessel, and one end of one coil is electrically connected to the fixed rod. One end of the other coil is electrically connected to the movable rod, and both the coils are connected in series to a pair of opposing electrodes, and a vacuum is generated when the pair of electrodes are separated. The generation of a longitudinal magnetic field parallel to the axial direction of the arc is described, and in FIG. 10 of Patent Document 2, the two sets of coils described in FIG. 1 of Patent Document 2 are grouped together. It is described that a coil is provided around an insulating cylinder.

JP-A-52-102576 JP-A-2-148636

  In Patent Documents 1 and 2 described above, it is possible to generate a spatially uniform longitudinal magnetic field by disposing a longitudinal magnetic field coil outside the vacuum vessel.

  However, in the structure shown in FIG. 3 of Patent Document 1, a conductor for folding the current (folded conductor) is required, and it is essential to install a conductive cylindrical container corresponding to the folded conductor on the outer periphery of the coil. Become.

  Thereby, in Patent Document 1, since the entire outer diameter is increased because the cylindrical container is installed on the outer periphery of the coil, the structure becomes complicated with this, and the current flowing through the cylindrical container (folded conductor) There arises a problem that the longitudinal magnetic field generated between the electrodes becomes non-uniform.

  On the other hand, Patent Document 2 shows that in FIG. 1, the axial distance increases because coils are arranged on each of both axial end plates outside the vacuum vessel, and in FIG. 10 of Patent Document 2, Since a folded conductor is necessary, the same problem as in Patent Document 1 occurs.

  The present invention has been made in view of the above points, and the object of the present invention is to generate a uniform longitudinal magnetic field with a simple structure even if two sets of longitudinal magnetic field coils are arranged outside the vacuum vessel. It is to provide a vacuum circuit breaker that can be used.

  In order to achieve the above object, the vacuum circuit breaker of the present invention includes two sets of coils that generate a magnetic field in a direction perpendicular to the end face of the contact electrode when energized, and one of the two sets of coils. In the vacuum circuit breaker in which one end is connected to the fixed side electrode and the other end is connected to the movable side electrode, the two sets of coils are alternately arranged around the vacuum vessel without overlapping each other. It is characterized by that.

  According to the present invention, a vacuum circuit breaker capable of generating a uniform longitudinal magnetic field with a simple structure can be obtained even if two sets of longitudinal magnetic field coils are arranged outside the vacuum vessel.

It is sectional drawing which shows Example 1 of the vacuum circuit breaker of this invention. It is a perspective view which shows the connection state of the coil in Example 1 of the vacuum circuit breaker of this invention. It is sectional drawing which shows Example 2 of the vacuum circuit breaker of this invention.

  The vacuum circuit breaker of the present invention will be described below based on the illustrated embodiment.

  1 and 2 show a first embodiment of a vacuum circuit breaker according to the present invention.

  As shown in the figure, the vacuum circuit breaker of Example 1 includes a fixed contact electrode 1, a movable contact electrode 2 opposite to the fixed contact electrode 1, a fixed rod 3 that fixes the fixed contact electrode 1, and a movable side. A movable side rod 4 that fixes the contact electrode 2, a bellows 5 that is vacuum-sealed and supports the movable side contact electrode 2 movably, an insulating cylinder 6 that constitutes a vacuum vessel, and a fixed side rod 3 are supported. Fixed side end plate 7, movable side end plate 8 movably supporting the movable side rod 4, first coil 9 a and second coil 9 b disposed around the insulating cylinder 6, and fixed side rod 3, the fixed side connection conductor 10 connecting the second coil 9b, the movable side connection conductor 11 connecting the movable side rod 4 and the first coil 9a, and the first coil 9a and the second coil 9b are molded. The insulating mold 12 is generally configured.

  Further, the vacuum circuit breaker of Example 1 will be described in detail. The fixed contact electrode 1 and the movable contact electrode 2 have a disk shape, and the fixed contact electrode 1 is connected to the fixed rod 3 having a cylindrical shape on the movable side. Each contact electrode 2 is fixed to a movable rod 4 having a cylindrical shape. The fixed-side contact electrode 1 and the movable-side contact electrode 2 are opposed to each other, and can move toward and away from each other when the movable-side contact electrode 2 and the movable-side rod 4 move in the axial direction. The central axes of the fixed side contact electrode 1, the movable side contact electrode 2, the fixed side rod 3, and the movable side rod 4 are arranged on the same line.

  The insulating cylinder 6 has a cylindrical shape, and both end surfaces thereof are closed by a fixed end plate 7 and a movable end plate 8 each having a disc shape. The fixed side rod 3 is fixed through the fixed side end plate 7, and the fixed side contact electrode 1 is disposed inside the insulating cylinder 6. A movable rod 4 that can move through the movable end plate 8 is attached via a bellows 5. The movable contact electrode 2 is disposed inside the insulating cylinder 6.

  In the first embodiment, the first coil 9a and the second coil 9b arranged around the insulating cylinder 6 are circular in cross section, have the same spiral shape, and surround the insulating cylinder 6 without overlapping each other. Are alternately arranged.

  The fixed coil end 9 a 1 of the first coil 9 a is connected to an external circuit, and the other movable cable end 9 a 2 is connected to the movable rod 4 via the movable connection conductor 11. On the other hand, the movable side end 9b2 of the second coil 9b is connected to an external circuit, and the other fixed side end 9b1 is connected to the fixed side rod 3 via the fixed side connection conductor 10. Further, in order to ensure insulation between the first coil 9a and the second coil 9b and to suppress deformation of the coil due to electromagnetic force, the first coil 9a and the second coil 9b are fixed by an insulating mold 12. Has been.

  Next, the current path in Example 1 is demonstrated using FIG.

  As shown in FIG. 1, the current flowing from the external circuit into the fixed side end 9a1 of the first coil 9a flows through the first coil 9a to the movable side end 9a2. Subsequently, the fixed side end portion 9b1 of the second coil 9b via the movable side connection conductor 11 → the movable rod 4 → the movable side contact electrode 2 → the fixed side contact electrode 1 → the fixed side rod 3 → the fixed side connection conductor 10. To flow. Then, it passes through the second coil 9b, flows to the movable side end 9b2, and flows out to the external circuit.

  Next, the operation for interrupting the current in Example 1 will be described with reference to FIG.

  As shown in FIG. 1, when the stationary contact electrode 1 and the movable contact electrode 2 are opened, an arc 13 is generated between the electrodes. At this time, since the currents flowing through the first coil 9a and the second coil 9b are in the directions shown in FIG. 1, a longitudinal magnetic field parallel to the arc 13 is generated. Since the arc 13 behaves so as to be supplemented by the lines of magnetic force, the arc 13 generated between the fixed-side contact electrode 1 and the movable-side contact electrode 2 is excellently maintained by being uniformly maintained over the entire electrode end surface. The blocking performance can be obtained.

  According to the configuration of the first embodiment, even when two sets of longitudinal magnetic field coils are arranged outside the vacuum vessel, the conventional folded conductor is not necessary, and the entire outer diameter and axial distance are eliminated. Therefore, the structure is not complicated, so that a uniform longitudinal magnetic field can be generated with a simple structure, and a vacuum circuit breaker for obtaining good breaking performance can be easily manufactured.

  Next, Example 2 of the vacuum circuit breaker of the present invention will be described with reference to FIG.

  The vacuum circuit breaker of Example 2 shown in FIG. 3 is obtained by replacing the first coil 9a and the second coil 9b in Example 1 described above with a coil having a rectangular cross section.

  Even with the configuration of the second embodiment, the same effects as those of the first embodiment can be obtained, and a vacuum circuit breaker having a small outer diameter can be manufactured even if the coil cross-sectional area is the same.

  DESCRIPTION OF SYMBOLS 1 ... Fixed side contact electrode, 2 ... Movable side contact electrode, 3 ... Fixed side rod, 4 ... Movable side rod, 5 ... Bellows, 6 ... Insulating cylinder, 7 ... Fixed side end plate, 8 ... Movable side end plate, 9a ... 1st coil, 9a1 ... Fixed side end of 1st coil, 9a2 ... Movable side end of 1st coil, 9b ... 2nd coil, 9b1 ... Fixed side end of 2nd coil, 9b2 The movable side end of the second coil, 10 the fixed side connection conductor, 11 the movable side connection conductor, 12 the insulating mold, and 13 the arc.

Claims (5)

Two sets of coils for generating a magnetic field in a direction perpendicular to the end face of the contact electrode when energized are provided outside the vacuum vessel, and one end of the two sets of coils is a fixed side electrode and the other end is a movable side electrode. In each connected vacuum circuit breaker,
The two sets of coils are alternately arranged around the vacuum vessel without overlapping each other. A vacuum vessel in which both end portions in the axial direction of an insulating cylinder formed in a cylindrical shape are sealed with end plates, a pair of relatively-separated fixed and movable electrodes disposed in the vacuum vessel, and the fixed A rod extending outside the vacuum vessel from the back surface of the side and movable side electrodes, and two sets of coils disposed outside the vacuum vessel and generating a magnetic field in a direction perpendicular to the end surfaces of the fixed side and movable side electrodes when energized A vacuum circuit breaker in which one end of the two sets of coils is connected to the fixed side electrode and the other end is connected to the movable side electrode.
The two sets of coils are alternately arranged around the vacuum vessel without overlapping each other. The vacuum circuit breaker according to claim 1 or 2,
A vacuum circuit breaker characterized in that the two sets of coils are circular in cross section and have the same spiral shape. The vacuum circuit breaker according to claim 1 or 2,
The two sets of coils have a rectangular cross section and the same spiral shape. The vacuum circuit breaker according to any one of claims 1 to 4,
The two sets of coils are fixed to the vacuum container by an insulating mold.

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