JP4684914B2 - Vacuum circuit breaker - Google Patents

Description

  The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker suitable for a power circuit breaker and particularly suitable for breaking a high voltage and a large capacity.

  In the vacuum circuit breaker, the contact between the fixed electrode and the movable electrode in the vacuum vessel becomes a point contact, so that the contact resistance increases, and the ability to continuously energize is usually limited to 3000A. In order to make this energization capacity 3000 A or more, it has been proposed to provide an external energization main contact in parallel with the fixed electrode and the movable electrode of the vacuum circuit breaker. That is, a method has been proposed in which a stationary energizing main contact and a movable energizing main contact are provided coaxially with an electrode outside the vacuum vessel (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 55-21807.

  In this type of vacuum circuit breaker, when opened, the movable-side main contactor moves in response to the separation operation between the fixed-side electrode and the movable-side electrode in the vacuum vessel, and the fixed-side conductive main contactor It moves in the opening direction with respect to the contact, and an open space is created between the tip of the movable main contact for energization and the tip of the fixed main contact for energization.

  This open space is configured so as not to face the outer periphery of the open position of the electrode and to be biased to one side in the open direction of the electrode. For this reason, although the equipotential lines between the fixed side electrode and the movable side electrode must have approximately the same number of equipotential lines in the radial direction from the vacuum vessel, the open space described above is used. Therefore, it is difficult to exit from the vacuum vessel in an equipotential state in the radial direction due to the presence of the eccentric position, that is, the presence of the main contact for energization on the fixed side or the movable side.

  As a result, equipotential lines are greatly biased to the outer periphery of the fixed side electrode or the movable side electrode, so that the surface electric field of the fixed side electrode or the movable side electrode doubles and becomes severe, and the desired blocking performance is obtained. Therefore, for example, the current situation is that it cannot cope with a current-carrying capacity of 4000 A or more.

  The present invention has been made based on the above-described matters, and an object of the present invention is to provide a high-voltage and large-capacity vacuum circuit breaker having a large current carrying performance.

To achieve the above object, the first invention comprises a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, in the fixed electrode and the movable electrode a vacuum circuit breaker comprising a current-carrying main contacts electrically connected in parallel, and an intermediate electrode current collector provided on the outer peripheral portion of the vacuum container corresponding to the movable electrode and the fixed electrode, the intermediate A current-carrying main contact that contacts and separates the current collector , and the vacuum vessel is driven when the current-carrying main contact is separated from the intermediate current collector. A cylindrical intermediate body disposed on the outer periphery of the movable electrode and the fixed electrode so that open spaces formed at both ends of the intermediate current collector are formed symmetrically with respect to the fixed electrode and the movable electrode; , Provided on both sides of the cylindrical intermediate body. Is characterized in that it comprises an insulating cylindrical body having a smaller diameter than the diameter of the cylindrical intermediate.

The second invention comprises a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, and electrically connected in parallel to said movable electrode and said fixed electrode A vacuum circuit breaker having a main contact for energization, wherein an intermediate collector provided concentrically with the fixed electrode and the movable electrode on an outer peripheral portion of the vacuum vessel corresponding to the fixed electrode and the movable electrode electrons and an end portion current collector electrons respectively fixed at a distance on both sides of the intermediate current electronic, connected to said end collecting electrons, the energizing main contact toward or away respectively to an end portion of the intermediate current electronic It is characterized by having a child.

Furthermore, the third invention comprises a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, and electrically connected in parallel to said movable electrode and said fixed electrode A vacuum circuit breaker having a main contact for energization, wherein an intermediate current collector provided on an outer peripheral surface of the vacuum vessel corresponding to the fixed electrode and the movable electrode, and a gap between both sides of the intermediate current collector and the end electrode current collector fixed respectively with, connected to said end collecting electrons, characterized in that a said energizing main contactor toward or away respectively to an end portion of the intermediate current electrons.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the energizing main contact is coupled to the movable electrode operating mechanism and is located on the fixed electrode side and the movable electrode side, respectively. It is characterized by being fixed to each rod.

Further, a fifth invention is characterized in that, in the second invention, the energizing main contactor is connected to an operating mechanism of the movable electrode and is arranged in parallel with an insulating rod located on the movable electrode side. .

Further, a sixth aspect of the present invention, a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and electrically connected in parallel to said movable electrode and said fixed electrode A vacuum circuit breaker comprising a main contact for energization, the intermediate collector provided on one side of the outer peripheral portion of the vacuum vessel corresponding to the fixed electrode and the movable electrode, and both sides of the intermediate collector and the end portion current collector electrons respectively fixed with an interval in part, connected to said end collecting electrons, and a said energizing main contactor toward or away respectively to an end portion of the intermediate current electronic, the vacuum vessel Open spaces formed at both ends of the energized main contact and the intermediate collector when the energized main contact is driven away from the intermediate collector, the fixed electrode and the movable electrode The movable electric power Includes a cylindrical intermediate body disposed on the outer periphery of the fixed electrode, respectively provided on both sides of the cylindrical intermediate, an insulating cylindrical body having a smaller diameter than the diameter of the cylindrical intermediate It is characterized by that.

Further, according to a seventh aspect, in the sixth aspect, the main contact for energization is connected to an operating mechanism of the movable electrode and is respectively connected to an insulating rod positioned on the fixed electrode side and the movable electrode side. It is characterized by being fixed.

The eighth invention is characterized in that, in the sixth invention, the energizing main contactor is connected to an operating mechanism of the movable electrode and is juxtaposed with an insulating rod located on the movable electrode side. .

Furthermore, a ninth aspect of the present invention, a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and electrically connected in parallel to said movable electrode and said fixed electrode A vacuum circuit breaker including a main contact for energization, the intermediate conductor provided in the vacuum vessel, the fixed electrodes provided on both sides of the intermediate conductor, and the movable electrodes contacting and separating from the fixed electrodes, respectively. An intermediate current collector provided on the outer peripheral surface of the vacuum container corresponding to the electrode, the two sets of fixed electrodes and the movable electrode, and an end current collector fixed on both sides of the intermediate current collector with a space therebetween If, connected to said end collecting electrons, characterized in that a said energizing main contactor toward or away respectively to an end portion of the intermediate current electrons.

Further, the tenth invention comprises: a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and electrically connected in parallel to said movable electrode and said fixed electrode A vacuum circuit breaker having a main contact for energization,
When the electrode opening, the energizing main contactor to form an open space which symmetrically distributed each equipotential line in the radial direction side of the movable electrode and the fixed electrode, and disposed on an outer peripheral portion of the vacuum chamber It is characterized by that.

  According to the present invention, the open space that occurs when the fixed-side energizing main contactor and the movable-side energizing main contact are opened is configured to be symmetrical with respect to the electrode in the radial direction of the vacuum vessel. The equipotential lines inside the vacuum interrupter can be distributed symmetrically without being biased toward one electrode in the radial direction of the vacuum vessel. As a result, the equipotential line distribution inside the vacuum interrupter is improved, the interrupting performance is greatly improved, and a high-voltage and large-capacity vacuum circuit breaker having a large current carrying capacity can be provided.

Embodiments of a vacuum circuit breaker according to the present invention will be described below with reference to the drawings.
1 and 2 show an embodiment of a vacuum circuit breaker of the present invention. FIG. 1 is a cross-sectional view showing a closed state in an embodiment of the vacuum circuit breaker of the present invention. FIG. It is sectional drawing which shows the open state in one Embodiment of the vacuum circuit breaker of this invention shown in FIG.
1 and 2, the vacuum vessel 1 includes two insulating cylindrical bodies 1A, a metal cylindrical intermediate body 1B provided between the insulating cylindrical bodies 1A, and an insulating cylindrical body 1A. The metal end plate 1 </ b> C provided at each of the end portions. The inside of the vacuum vessel 1 is evacuated to an ultrahigh vacuum with a pressure lower than 10 ⁻³ (Pa) and sealed.

  In the cylindrical intermediate body 1B of the vacuum vessel 1, a disk-shaped fixed electrode 2 and a disk-shaped movable electrode 3 are disposed to face each other. The fixed electrode 2 is attached to one end of the fixed conductive rod 4. The other end of the fixed conductive rod 4 is connected to the fixed conductor 5. The movable electrode 3 is attached to one end of the movable conductive rod 6. The other side of the movable conductive rod 6 is movable in the axial direction via a bellows 7, and is hermetically sealed to the end plate 1C on the movable electrode side.

  On the outer periphery of the cylindrical intermediate body 1B of the vacuum vessel 1, a cylindrical intermediate current collector 8 is supported and fixed concentrically with the axes of the electrodes 2 and 3 by an appropriate support 9. The end current collectors 10 are concentrically arranged and fixed on the outer peripheries of the end plate 1C on the fixed electrode 2 side and the end plate 1C on the movable electrode 3 side, respectively. Between each end current collector 10 and the intermediate current collector 8, an energizing main contactor 11 that is in contact with and away from the intermediate current collector 8 is movably provided.

  Each energizing movable main contact 11 is fixed to an insulating rod 12. Each insulating rod 12 is connected to an operating mechanism (not shown). By driving this operation mechanism, each energizing main contactor 11 maintains its electrical connection with each end current collector 10, so that its tip comes in contact with and separates from the end of the intermediate current collector 8. Moving.

  The energizing main contact 11, the end current collector 10, and the intermediate current collector 8 constitute an energizing main contact.

Next, operation | movement of one Embodiment of the vacuum circuit breaker of this invention mentioned above is demonstrated using FIG.1 and FIG.2.
As shown in FIG. 1, in a closed state where the electrodes 2 and 3 are in contact with each other and each energizing main contactor 11 is connected to the intermediate current collector 8, the current is fixed by a conductor (not shown) during energization. The current is diverted from the side conductor 5 to the end current collector 10 on the fixed electrode side, flows into the intermediate current collector 8 through the main contact 11 for energization on the fixed electrode side, and is movable through an appropriate conductive portion (not shown). The current flows from the current-carrying main contact 11 on the electrode side.

  In order to cut off the current, first, as shown in FIG. 2, the energizing main contacts 11, 11 are driven by the operation mechanism so as to be separated from each other, and are separated from the intermediate current collector 8, and the current is supplied to the end portion. Move to current collectors 10 and 10, respectively. Thereafter, after the distances between the tips of the energizing main contacts 11 and 11 and the end of the intermediate current collector 8 reach predetermined separation distances that can withstand the transient recovery voltage at the time of interruption, the vacuum vessel 1 The inner electrodes 2 and 3 are opened to interrupt the current. The current is applied in reverse, and after the electrodes 2 and 3 in the vacuum vessel 1 are closed first, the energizing main contacts 11 and 11 and the intermediate current collector 8 are closed by the movement of the energizing main contacts 11 and 11. Is done.

  In the open state of the front ends of the energizing main contacts 11, 11 and the intermediate current collector 8, the energizing main contacts 11, 11 move on the outer circumferences on both sides of the cylindrical intermediate body 1 </ b> B of the vacuum vessel 1. The open spaces X are formed symmetrically. Thereby, in the open state, the open space X by the energizing main contacts 11 for energization corresponds to the radial positions of the two insulating cylindrical bodies 1A and 1A of the vacuum vessel 1 respectively. Become.

  Therefore, the equipotential lines Y at the electrodes 2 and 3 can exit from the insulating cylindrical bodies 1A and 1A almost equally in the radial direction without being biased to one side, and the metal of the vacuum vessel 1 The cylindrical intermediate body 1B has a substantially intermediate potential between the fixed side potential and the movable side potential. As a result, the potential distribution inside the vacuum interrupter is greatly improved, and a significant improvement in interrupting performance can be achieved.

By improving the breaking performance, it is possible to provide a high-voltage, large-capacity vacuum circuit breaker having a large current carrying performance. That is, it is possible to provide a large-capacity vacuum circuit breaker with a rated current of 4000 A or more, which has been difficult in the past.
3 and 4 show another embodiment of the vacuum circuit breaker of the present invention. FIG. 3 is a cross-sectional view showing a closed state in another embodiment of the vacuum circuit breaker of the present invention. These are sectional drawings which show the open state in other embodiments of the vacuum circuit breaker of the present invention shown in FIG.
In FIGS. 3 and 4, the same reference numerals as those shown in FIGS. 1 and 2 are the same or corresponding parts, and detailed description thereof will be omitted. In this embodiment, one end of the insulating rod 13 is fixed to the insulating rod 12 on the movable electrode 3 side, and the energizing main contact 11 on the fixed electrode 2 side is fixed to the other end. 11 is a single insulating rod 12 for operating 11.

  In this embodiment, the energizing main contacts 11, 11 are both driven in the right-hand direction to reach the open position by driving the insulating rod 12 in the right-hand direction in the drawing when opened. As a result, in the open state, as shown in FIG. 4, open spaces X are formed corresponding to the radial direction portions of the two insulating cylindrical bodies 1A, 1A of the vacuum vessel 1, respectively.

  As a result, the equipotential lines Y in the electrodes 2 and 3 can exit from the insulating cylindrical bodies 1A and 1A almost equally in the radial direction, and the metal cylindrical intermediate body 1B of the vacuum vessel 1 is fixed to the fixed side. The potential is substantially intermediate between the potential and the movable side potential. For this reason, it is possible to provide a high-voltage, large-capacity vacuum circuit breaker having a large current carrying performance as in the above-described embodiment, and since only one operating device is required, the mechanism system can be simplified, Miniaturization is possible.

  In the above-described embodiment, the insulating rod 13 is present in the open space X corresponding to the right insulating cylindrical body 1A, but there is a slight disturbance of the equipotential line, but this is a local disturbance. Yes, the impact on the whole is small.

  5 and 6 show still another embodiment of the vacuum circuit breaker of the present invention, and FIG. 5 is a cross-sectional view showing a closed state in still another embodiment of the vacuum circuit breaker of the present invention. FIG. 6 is a cross-sectional view showing the opened state of the vacuum circuit breaker of the present invention shown in FIG. 5 in still another embodiment. 5 and 6, the same reference numerals as those shown in FIGS. 1 and 2 are the same or corresponding parts, and thus detailed description thereof is omitted. In this embodiment, an intermediate current collector 8 is provided in a cylindrical intermediate body 1B that constitutes the vacuum vessel 1, and the current-carrying main contacts 11, 11 can be connected to and separated from the intermediate current collector 8, respectively. is there.

  According to this embodiment, a high-voltage, large-capacity vacuum circuit breaker having a large current carrying performance can be provided as in the above-described embodiment, and the energizing main contacts 11, 11 can be provided in the radial direction. The size of the device becomes smaller, and it becomes smaller and cheaper.

7 and 8 show another embodiment of the vacuum circuit breaker of the present invention, and FIG. 7 is a cross-sectional view showing a closed state in another embodiment of the vacuum circuit breaker of the present invention, FIG. These are sectional drawings which show the open state in other embodiments of the vacuum circuit breaker of the present invention shown in FIG.
7 and 8, those having the same reference numerals as those shown in FIGS. 1 and 2 are the same or corresponding parts, and thus detailed description thereof will be omitted. In this embodiment, similarly to the embodiment shown in FIG. 6 described above, an intermediate current collector 8 is provided on the outer peripheral surface of the cylindrical intermediate body 1B constituting the vacuum vessel 1, and the intermediate current collector 8 is energized. The main contacts 11 and 11 are configured to be able to contact and separate from each other, an intermediate conductor 14 is provided inside a cylindrical intermediate body 1B constituting the vacuum vessel 1, and fixed electrodes 2 are provided on both sides of the intermediate conductor 14, respectively. The movable electrode 3 is disposed opposite to the fixed electrode 2.

  According to this embodiment, a high-voltage, large-capacity vacuum circuit breaker having a large current carrying performance can be provided as in the above-described embodiment, and the energizing main contacts 11, 11 can be provided in the radial direction. The size of the device becomes smaller, and it becomes smaller and cheaper. Moreover, a simple one can be provided as a two-point vacuum circuit breaker.

9 and 10 show still another embodiment of the vacuum circuit breaker of the present invention, and FIG. 9 is a cross-sectional view showing a closed state in still another embodiment of the vacuum circuit breaker of the present invention. FIG. 10 is a cross-sectional view showing the opened state of the vacuum circuit breaker of the present invention shown in FIG. 9 in still another embodiment.
9 and 10, the same reference numerals as those shown in FIGS. 1 and 2 are the same or corresponding parts, and thus detailed description thereof is omitted. This embodiment is an example in which the intermediate current collector 8 and the energizing main contacts 11, 11 that are in contact with and away from the intermediate current collector 8 are provided on the side of the vacuum vessel 1, and the energizing main contacts 11, 11 are placed on the paper surface. It is configured to be movable in the left-right direction.

  Also in this embodiment, since the open space X exists at the position corresponding to the radial direction of the insulating cylindrical body 1A of the vacuum vessel 1 when the energizing main contacts 11, 11 are opened, the same as in the above-described embodiment. In addition, it is possible to provide a high-voltage and large-capacity vacuum circuit breaker having a large-current conducting performance, and to make the energizing main contacts 11 and 11 small and light.

  11 and 12 show another embodiment of the vacuum circuit breaker of the present invention, and FIG. 11 is a cross-sectional view showing a closed state in another embodiment of the vacuum circuit breaker of the present invention. These are sectional drawings which show the open state in further another embodiment of the vacuum circuit breaker of this invention shown in FIG. 11 and 12, those having the same reference numerals as those shown in FIGS. 1 and 2 are the same or corresponding parts, and therefore detailed description thereof will be omitted. In the embodiment shown in FIG. 10, as in the embodiment shown in FIG. 3, one end of the insulating rod 13 is fixed to the insulating rod 12 on the movable electrode 3 side, and the fixed electrode 2 is connected to the other end in the embodiment shown in FIG. The main contact 11 for energization on the side is fixed, and the insulation rod 12 for operating the main contact 11 for energization is made into one.

  In this embodiment, the energizing main contacts 11, 11 are both driven in the right-hand direction to reach the open position by driving the insulating rod 12 in the right direction in the drawing when opened. As a result, in the open state, as shown in FIG. 4, open spaces X are formed corresponding to the radial direction portions of the two insulating cylindrical bodies 1A, 1A of the vacuum vessel 1, respectively.

  Therefore, similarly to the above-described embodiment, a high-voltage and large-capacity vacuum circuit breaker having a large current conducting performance can be provided, and the conducting main contacts 11 and 11 can be configured to be small and light. . Further, since only one operating device is required, the mechanism system can be simplified and the size can be reduced.

  In the above-described embodiment, the insulating rod 13 is present in the open space X corresponding to the right insulating cylindrical body 1A, but there is a slight disturbance of the equipotential line, but this is a local disturbance. Yes, the impact on the whole is small.

  In addition, in the above-mentioned embodiment, it can apply also when providing a shield in the outer periphery corresponding to a fixed electrode and a movable electrode.

  According to the embodiment of the present invention described above, in the open state, the open portions of the main contact for energization respectively correspond to the radial positions of the two insulating cylindrical bodies constituting the vacuum vessel. The equipotential lines can exit from the two insulating cylinders almost equally in the radial direction, and the vacuum vessel has a potential approximately halfway between the fixed electrode side potential and the movable electrode side potential. As a result, the potential of the vacuum vessel, which has been biased to the potential of one of the electrodes in the past, becomes almost the middle potential between the fixed side electrode and the movable side electrode, and the equipotential line distribution inside the blocked vacuum interrupter is improved. , Blocking performance is greatly improved. Thereby, a high voltage large capacity vacuum circuit breaker capable of energizing a large current can be provided.

It is sectional drawing which shows the closed state in one Embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in one Embodiment of the vacuum circuit breaker of this invention shown in FIG. It is sectional drawing which shows the closed state in other embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in other embodiment of the vacuum circuit breaker of this invention shown in FIG. It is sectional drawing which shows the closed state in other embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in further another embodiment of the vacuum circuit breaker of this invention shown in FIG. It is sectional drawing which shows the closed state in other embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in other embodiment of the vacuum circuit breaker of this invention shown in FIG. It is sectional drawing which shows the closed state in other embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in further another embodiment of the vacuum circuit breaker of this invention shown in FIG. It is sectional drawing which shows the closed state in other embodiment of the vacuum circuit breaker of this invention. It is sectional drawing which shows the open state in further another embodiment of the vacuum circuit breaker of this invention shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum vessel 1A Insulating cylindrical body 1B Metal cylindrical intermediate body 1C Metal end plate 2 Fixed electrode 3 Movable electrode 4 Fixed conductive rod 5 Fixed side conductor 6 Movable conductive rod 7 Bellows 8 Intermediate current collector 9 Support body 10 End Current collector 11 Main contactor 12 for energization Insulating rod 13 Insulating rod 14 Intermediate conductor X Open space Y Equipotential line

Claims (10)

Comprising a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
Wherein with the fixed electrode and the intermediate electrode current collector, wherein provided on the outer periphery portion of the vacuum container corresponding to the movable electrode, and a current-carrying main contacts approaching and moving away from each said intermediate current electronic,
The open space formed at both ends of the energized main contact and the intermediate collector when the energized main contact is driven away from the intermediate collector, and the vacuum vessel has the fixed electrode And a cylindrical intermediate body arranged on the outer periphery of the movable electrode and the fixed electrode so as to be symmetrically formed with respect to the movable electrode, and provided on both sides of the cylindrical intermediate body, A vacuum circuit breaker comprising an insulating cylindrical body having a diameter smaller than the diameter of the intermediate body . Comprising a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
An intermediate collector provided concentrically with the fixed electrode and the movable electrode on the outer peripheral portion of the vacuum vessel corresponding to the fixed electrode and the movable electrode, respectively, with an interval between both sides of the intermediate collector. a fixed end electrode current collector, connected to said end collecting electrons, the vacuum circuit breaker is characterized in that a said energizing main contactor toward or away respectively to an end portion of the intermediate current electrons. Comprising a vacuum container, a fixed electrode provided in the vacuum container, a movable electrode that contact and separation to the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
An intermediate current collector provided on an outer peripheral surface of the vacuum vessel corresponding to the fixed electrode and the movable electrode; an end current collector fixed to both sides of the intermediate current collector with a gap; and the end current collector A vacuum circuit breaker comprising : the main contactors for energization connected to electrons and respectively contacting and leaving the end portions of the intermediate current collectors. The main contactor for energization is connected to an operation mechanism of the movable electrode, and is fixed to insulating rods positioned on the fixed electrode side and the movable electrode side, respectively. Vacuum circuit breaker. The vacuum circuit breaker according to claim 2, wherein the energizing main contactor is connected to an operating mechanism of the movable electrode, and is arranged in parallel with an insulating rod located on the movable electrode side. Comprising a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
An intermediate current collector provided on one side of the outer peripheral portion of the vacuum vessel corresponding to the fixed electrode and the movable electrode, an end current collector fixed on both sides of the intermediate current collector with a gap, and and connected to the end electrode current collector, and a said energizing main contactor toward or away respectively to an end portion of the intermediate current electronic,
The open space formed at both ends of the energized main contact and the intermediate current collector when the energized main contact is driven so as to be separated from the intermediate current collector. And a cylindrical intermediate body arranged on the outer periphery of the movable electrode and the fixed electrode so as to be symmetrically formed with respect to the movable electrode, and provided on both sides of the cylindrical intermediate body, A vacuum circuit breaker comprising an insulating cylindrical body having a diameter smaller than the diameter of the intermediate body . The vacuum according to claim 6, wherein the energizing main contact is connected to an operating mechanism of the movable electrode, and is fixed to insulating rods positioned on the fixed electrode side and the movable electrode side, respectively. Circuit breaker. The vacuum circuit breaker according to claim 6, wherein the energizing main contactor is connected to an operation mechanism of the movable electrode, and is arranged in parallel with an insulating rod located on the movable electrode side. Comprising a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
Corresponds to the intermediate conductor provided in the vacuum vessel, the fixed electrodes provided on both sides of the intermediate conductor, the movable electrodes contacting and leaving the fixed electrodes, and the two sets of fixed electrodes and the movable electrodes, respectively. Intermediate collectors provided on the outer peripheral surface of the vacuum vessel, end collectors fixed on both sides of the intermediate collectors at intervals, and connected to the end collectors, A vacuum circuit breaker comprising the main contact for energization that contacts and separates from each end. Comprising a vacuum container, a fixed electrode provided in the vacuum vessel, and the movable electrode toward or away the fixed electrode, and a current-carrying main contacts connected electrically in parallel with said movable electrode and said fixed electrode Vacuum circuit breaker,
When the electrode opening, the energizing main contactor to form an open space which symmetrically distributed each equipotential line in the radial direction side of the movable electrode and the fixed electrode, and disposed on an outer peripheral portion of the vacuum chamber A vacuum circuit breaker characterized by that.

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