JP2008311036A - Vacuum switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vacuum switchgear enabling miniaturization of the entire device by simplifying an operation mechanism, and by making a necessary load constant when an electric current is supplied/cut off. <P>SOLUTION: A double-break vacuum switchgear enables the electric current to be simultaneously supplied and cut off in a pair of series-connected cut-off parts. The pair of series-connected cut-off parts is perpendicularly connected to a connection conductor, and an operation means is perpendicularly connected to the center of the connection conductor in the longitudinal direction. The operation means serves as a symmetric axis for two pairs of cut-off parts, and in a state where the pair of cut-off parts is cut off, a gap between a movable electrode 5a and a fixed electrode 4a is formed larger (Gin<Gout) as it goes away from the symmetric axis. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vacuum switchgear provided with a cutoff part in a vacuum vessel, and more particularly to a two-point vacuum switchgear that simultaneously opens two pairs of cutoff parts connected in series to cut off current. It is.

  Conventionally, various types of two-point cut-off vacuum switch gears have been proposed as two-point cut vacuum switch gears that simultaneously open two pairs of cut-off portions connected in series in a vacuum vessel to cut off current. First, as in the first type, as described in Patent Document 1 below, two vacuum valves are arranged in a straight line so that the fixed electrode is on the outside, and the movable electrode is placed in the middle portion between the operating electrodes. Those that open and close are already known. In addition, as a second type, there is already known one in which vacuum valves are arranged in parallel and each movable electrode is opened and closed by one operating device. According to Patent Document 2 below, the link mechanism is A second type of vacuum switch gear has been proposed which is unnecessary.

  In addition, Patent Document 3 below describes a second type of vacuum switch gear in which a vacuum valve is molded instead of being housed in a container. Further, Patent Document 4 below describes a vacuum switchgear having a structure in which two opening / closing parts, a main circuit opening / closing part and a ground opening / closing part, are arranged in one vacuum vessel.

Japanese Patent No. 3237445 JP-A-10-178713 JP 2002-152930 A JP 2001-126595 A

  Here, the first type vacuum switchgear will be described with reference to FIG. In this first type of vacuum switchgear, as is apparent from the drawing, the two vacuum valves 3 are aligned in the insulating container 2 so that the fixed electrode is on the outside and the movable electrode is on the inside. Be placed. The insulating container 2 is filled with high-pressure SF6 gas. The movable electrodes of the two vacuum valves 3 are connected by the connection conductor 6 through the sliding contact 6a. Thereby, a pair of interruption | blocking part 16 is connected in series.

  On the other hand, each movable electrode which comprises the said interruption | blocking part 16 is connected with the insulation operation means 10 via the link part 17, and is further connected with the operating device which is not shown in figure. That is, when the above-described insulation operating means 10 is operated in the horizontal direction shown in the figure by an operating device (not shown), the link part 17 converts the movement of the movable electrode into the vertical direction, and the shut-off parts of the two vacuum valves are simultaneously opened and closed. Is done. The insulation operation means 10 is constituted by an insulating member in order to electrically insulate the interrupting portion at a high potential from the operating device at the ground potential.

  Further, the second type vacuum switchgear will be described with reference to FIG. In this second type of vacuum switch gear, two vacuum valves 3 are arranged in parallel in the hermetic container 2 so that the fixed electrodes are adjacent to each other and the movable electrodes are adjacent to each other. The airtight container 2 is filled with high-pressure SF6 gas as described above, and the movable electrodes of the two vacuum valves 3 are connected by the connection conductor 6 via the sliding contact 6a. Thereby, a pair of interruption | blocking part 16 is connected in series.

  On the other hand, the movable electrodes constituting the blocking part 16 are connected by a connecting part 18 and further connected to the operating device 12 by an insulating operation means 10. That is, when the operating device 12 moves the insulation operating means 10 upward in the figure, the shut-off portions of the two vacuum valves 3 are simultaneously opened and closed. The insulating operation means 10 is composed of an insulating member in order to electrically insulate the interrupting portion at a high potential from the operating device 12 at the ground potential.

  As described above, the first type vacuum switch gear described above uses two vacuum valves in which one shut-off portion is housed in one vacuum vessel, and is connected in series to make a two-point vacuum switch. A gear is formed. Therefore, there is a problem that the apparatus becomes large and a complicated link mechanism is required. Therefore, in order to eliminate the need for a link mechanism, a second type vacuum switch gear as disclosed in Patent Document 2 has been proposed.

  However, the second type vacuum switchgear described above has a structure in which the insulating operation means for electrically insulating the high-voltage cutoff unit and the ground potential operating device is arranged outside the vacuum vessel. For this reason, it is necessary to increase the creeping distance of the insulating operation means, and there is a problem that the apparatus itself is increased in size.

  Therefore, in order to solve the problems in the prior art described above, according to the above-mentioned Patent Document 4, the operation mechanism can simultaneously turn on and off a pair of interrupting units, and A two-point vacuum switch gear that can be reduced in size has been proposed.

  However, in the structure proposed by the above-mentioned Patent Document 4, if the contact pressure between the electrodes at the time of current application is insufficient, there is a possibility that large welding occurs at the contact portion of the electrodes. Therefore, in order to peel off such welding, a force greater than the breaking strength of the electrode material is required. That is, in any case, when a pair of breakers are simultaneously turned on and off, an unbalance of force required for the pair of breakers may occur between the pair of breakers. This is because the moment is more dominant than the axial force in the peeling force required at the time of breaking in the mechanism that operates the pair of breaking portions at the same time.

  That is, the necessary peeling force is proportional to the distance from the axis of symmetry relative to the operating means to the welding location. For this reason, the force necessary for the interruption varies depending on the size of the welding that occurs when the current is supplied and the place where the welding occurs. And the increase in the force required for this interruption becomes a cause of increasing the size of the operating device, and also leads to a problem that it is difficult to ensure the reliability of the interface of the connection part of the component.

  Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and in particular, the operation mechanism is simplified, and the load required at the time of turning on and off the current is made constant, thereby reducing the size of the entire apparatus. An object of the present invention is to provide a two-point vacuum switchgear that can be realized.

  In order to achieve the above object, according to the present invention, first, a vacuum vessel including an insulating cylinder, each of which is constituted by a movable conductor, a movable electrode, a fixed conductor, and a fixed electrode, and the vacuum vessel A pair of blocking portions disposed so as to be movable in parallel with each other, a connection conductor for electrically connecting the two movable electrodes inside the vacuum vessel, and the connection conductor, and the vacuum vessel An operating means for operating the movable electrode from the outside, and in the vacuum switchgear that simultaneously opens the pair of interrupters connected in series and interrupts the current, the pair of interrupters connected in series The movable electrode is separated from the fixed electrode by the operating means when the current is interrupted, and the current is applied to at least one of the opposed surfaces of the movable electrode and the fixed electrode when the current is supplied. Vacuum switchgear is provided with means for the constant location of the weld that.

  According to the present invention, in the vacuum switchgear described above, the welding location fixing means is symmetric with respect to the symmetry axis of the pair of blocking portions on at least one of the opposing surfaces of the movable electrode and the fixed electrode. Or the welding location fixing means is a two-stage surface comprising a protrusion and a flat portion on at least one of the opposing surfaces of the movable electrode and the fixed electrode. preferable. In addition, an inclination or a protrusion provided on at least one of the opposing surfaces of the movable electrode and the fixed electrode is a gap between the movable electrode and the fixed electrode in the cut-off state of the pair of cut-off portions. Is configured to increase as the distance from the axis of symmetry increases.

  According to the present invention described above, in the two-point vacuum switch gear having an operation mechanism for simultaneously applying and interrupting current using a pair of interrupting portions, it is possible to make the welding position of the electrode generated when current is applied constant. Therefore, the load required for interrupting the current can be made constant, and at the same time, the structure of the vacuum switch gear can be simplified and the size can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 attached herewith shows a vacuum switchgear 1 according to a first embodiment, which is a first embodiment of the present invention, in section. In this figure, a pair of blocking portions 16 are arranged in parallel in the metal vacuum vessel 2. Each of these blocking portions 16 includes a fixed electrode 4a and a movable electrode 5a, and each blocking portion 16 is surrounded by a separate arc shield 11 respectively.

  And the fixed electrode 4a which comprises the said interruption | blocking part 16 is supported by the front-end | tip part by the fixed conductor 4, This fixed conductor 4 is supported in the vacuum vessel 2 via the end plate 2a and the insulation cylinder 3. FIG. Has been. One of the end portions of these two fixed conductors 4 is a bus-side terminal 13 and the other is a load-side terminal 14.

  On the other hand, each of the movable electrodes 5a is supported by the movable conductor 5 at its distal end, and these two movable conductors 5 are connected by the connection conductor 6 in the vacuum vessel 2. That is, by this, a pair of blocking portions 16 are connected in series between the bus-side terminal 13 and the load-side terminal 14.

  As described above, since the two movable conductors 5 adopt a structure in which they are directly connected by the connecting conductor 6, unlike the conventional example shown in FIG. 5, there is no need for a sliding contact or the like. It becomes possible to make a simple structure.

  In addition, the gap between the movable electrode 5a and the fixed electrode 4a constituting each blocking portion 16 is formed to be different at the position of the facing surface of the facing electrode at the time of current blocking, as shown in FIG. . That is, as shown in FIG. 2, the operating means (the operating means 10 described below) is a symmetric axis, and the gap Gin closer to the symmetric axis is smaller than the gap Gout far from the symmetric axis. The movable electrode 5a and the fixed electrode 4a are manufactured so as to be inclined on the opposing surfaces. More specifically, the plate thickness of the fixed electrode 4a and the plate thickness of the movable electrode movable electrode 5a constituting the pair of blocking portions 16 are set to the plate on the side closer to the plate farther from the operation means that is the axis of symmetry. It is formed to be thicker than the thickness. Thereby, the movable electrode 5a is made to collide with the fixed electrode 4a by a predetermined operating force, that is, it is possible to make the place of welding generated when current is supplied constant.

  In addition, the movable electrode 5a and the fixed electrode 4a manufactured with an inclined surface are provided symmetrically about the operation means 10 that is the axis of symmetry. According to this, the welding location that occurs when the current is supplied can keep the distance from the axis of symmetry constant (equal), and then the force required for peeling off the electrode when the current is interrupted is constant. (Equivalent). In other words, if the force required for peeling off the electrode is constant (equal), the required operating force is also constant (equal), and the required force due to uneven welding locations as in the past Thus, the force generated by the operating means 10 can be set to a minimum without causing an unbalance.

  In addition, according to the above embodiment, when the movable electrode 5a and the fixed electrode 4a on the side where the gap Gin between them is small are connected with a straight line, the movable conductor and the fixed conductor are positioned along substantially the inner circumference. As a result, the movable electrode 5a and the fixed electrode 4a are connected at a substantially inner circumferential position. As a result, the energizing directions of the movable electrode 5a and the fixed electrode 4a are different from each other, and it is possible to prevent the electromagnetic repulsion force from increasing.

  The connecting conductor 6 is connected to the operating means 10 through an insulator 7. In addition, when an organic insulating material is used in a vacuum, a problem of gas emission occurs from the material. Therefore, as the insulator 7, for example, an inorganic insulating material such as ceramic is preferably used. By adopting a structure in which the insulator 7 is arranged in a vacuum, a predetermined insulation performance can be obtained without taking a creepage distance too large. For this reason, the insulator 7 can be reduced in size, and thus the entire apparatus can be reduced in size.

  In addition, according to the configuration described above, it is not necessary to configure the operating means 10 with an insulator, so that a material having high mechanical strength can be appropriately selected and configured as necessary. The operating means 10 is led out through the end plate 2b supported by the vacuum vessel 2 through the insulating cylinder 3. The operation means 10 and the end plate 2b are coupled to each other by, for example, a bellows 8, so that the airtightness in the vacuum vessel 2 is maintained. The operating means 10 is connected to an operating device 12 outside the vacuum vessel 2 as shown in the figure.

  And according to this Embodiment, the outer side of the metal vacuum vessel 2 is molded including the insulating cylinder 3, and, thereby, what is called a mold part 15 is comprised. It should be noted that, in the mold portion 15, in the portion where the bus bar side terminal 13 and the load side terminal 14 are led out, the entire insulating tube 3, the outer periphery of the end plate 2 b and the terminals 13, 14 are integrated with, for example, resin. However, the end surfaces of the bus-side terminal 13 and the load-side terminal 14 are exposed. Further, the portion where the operating means 10 is led out is molded except for the end plate 2b and the bellows 8 portion as shown. Thus, by molding the outer periphery of the vacuum switch gear, not only can it be applied to a gas insulated switchgear as described in Patent Document 2, but also as described in Patent Document 3. It can also be applied as one of the units of a solid insulated switchgear. Therefore, according to such a mold structure, it is possible to expand the application range of the vacuum switchgear. In addition, when the said vacuum switch gear is arrange | positioned, for example in SF6 gas in a gas insulated switchgear, this mold can be abbreviate | omitted.

  Subsequently, in the vacuum switch gear whose detailed structure has been described above, in the state shown in FIG. 1, the blocking portion 16 of the vacuum switch gear is open. In this state, when a closing signal is input to the operation device 12, the operation device 12 moves the operation means 10 upward in the drawing. As a result, the insulator 7, the connecting conductor 6, and the pair of movable conductors 5 and the fixed electrode 5 a together with the operating means 10 move upward in the figure, and thus the movable electrode 5 a becomes the fixed electrode. 4a will be contacted. As a result, a circuit of bus-side terminal 13-fixed conductor 4-fixed electrode 4a-movable electrode 5a-movable conductor 5-connection conductor 6-movable conductor 5-movable electrode 5a-fixed electrode 4a-load-side terminal 14 is formed. .

  On the other hand, when the vacuum switch gear is shut off, a shut-off signal is input to the operating device 12, and the operating means 10 is moved downward in the figure. As a result, the two movable electrodes 4a are simultaneously separated from the fixed electrode 5a, so that the electric circuit is interrupted at two points. During this time, the operating means 10 moves in and out of the vacuum container 1, but the space between the operating means 10 and the vacuum container 2 is sealed by the bellows 8, and the vacuum in the vacuum container 2 is maintained.

  Next, a second embodiment which is a second embodiment of the present invention will be described with reference to FIG. In the following description, points different from the first embodiment (FIGS. 1 and 2) will be mainly described, and overlapping descriptions will be omitted.

  Also in this example, the operating means 10 is coupled via the insulator 7 to the connecting conductor 6 to which the two movable conductors 5 are connected. Then, as shown in FIG. 3, the opposed surfaces of the movable electrode 5a and the fixed electrode 4a are set so that the operating means 10 is the axis of symmetry and the gap Gin closer to the axis of symmetry is smaller than the gap Gout farther from the axis of symmetry. , The protrusion 5b is formed on the electrode surface closer to the axis of symmetry. That is, each of the movable electrode 5a and the fixed electrode 4a is formed in a two-stage shape including a portion where a protrusion is formed and a portion where there is no protrusion (flat), and the electrode closer to the axis of symmetry. The protrusion is formed on the contact surface. Also in this manner, as in the first embodiment, the movable electrode 5a of the pair of blocking portions and the fixed electrode 4a collide with each other by a predetermined force, that is, the welding place that occurs when the current is applied is a fixed place. Can be. That is, as in the first embodiment, the distance from the symmetry axis to the welding location can be made constant, and therefore the force required for peeling can be minimized.

  In both of Examples 1 and 2, the opposing inter-electrode gap can be confirmed by measuring the electrical resistance value at the bus-side terminal 13 and the load-side terminal 14.

  In addition, in Example 1 and Example 2 above, in order to reduce the gap between the movable electrode 5a and the fixed electrode 4a constituting the blocking part 16 of the vacuum switchgear, a predetermined place on the opposing surface, Although it has been described that the movable electrode 5a and the fixed electrode 4a are inclined or provided with protrusions 5b, the present invention is not limited to this, and the inclined or protrusion 5b is provided only on one surface thereof. May be good. That is, it is only necessary that the place of welding that occurs when the current is applied can be made constant. In particular, in the above embodiment, in the vacuum switchgear, the inclination or the protrusion 5b provided on at least one of the opposed surfaces of the movable electrode 5a and the fixed electrode 4a is movable in the blocking state of the blocking portion. The gap between the electrode and the fixed electrode is configured to increase (Gin <Gout) as the distance from the axis of symmetry increases.

  In summary, according to the present invention, a vacuum vessel including an insulating cylinder, each of which is constituted by a movable conductor, a movable electrode, a fixed conductor, and a fixed electrode, and is parallel to the vacuum vessel. A pair of blocking portions arranged so as to be movable, a connection conductor for electrically connecting the two movable electrodes inside the vacuum vessel, and connected to the connection conductor, the movable electrode being connected from the outside of the vacuum vessel; The two-point cut vacuum switchgear comprising operating means for operating and simultaneously opening a pair of series-connected interrupting parts to interrupt an electric current, wherein the pair of series-connected interrupting parts are connected to the connection conductor Connected vertically, the operating means is vertically connected to the center in the longitudinal direction of the connecting conductor, the operating means is disposed on the axis of symmetry of the pair of blocking portions, and the blocking state of the pair of blocking portions In front of the movable electrode at Gap between the fixed electrode, the vacuum switchgear configured to be larger as the distance from the axis of symmetry is provided.

  Further, according to the present invention, in the vacuum switchgear, the plate thickness of the fixed electrode of the pair of blocking portions or the plate thickness of the movable electrode is closer to the symmetry axis than the plate thickness far from the symmetry axis. It is preferable that the thickness of the closer plate is increased, and further, the movable electrode or the fixed electrode is formed in a two-stage shape having a protrusion and a portion not having a protrusion, and is close to the axis of symmetry. It is preferable that a protrusion is formed on the electrode contact surface. Furthermore, in the vacuum switchgear, the movable conductor or the fixed conductor is made of two kinds of materials, and a portion closer to the symmetry axis is a higher-rigidity material than a portion farther away from the symmetry axis. It is preferable that the first portion is formed of a higher conductive material than the closer portion.

It is side surface sectional drawing for showing including the internal structure of the vacuum switchgear which becomes the 1st Example of this invention. It is a figure which takes out and demonstrates the structure containing the movable electrode and fixed electrode of the said vacuum switch gear, the gap between them, and also a connection conductor and an insulator. It is a figure which takes out and demonstrates the structure containing a connection electrode and an insulator between the movable electrode in the vacuum switchgear which becomes the 2nd Example of the present invention, a fixed electrode, the gap between them. It is sectional drawing which shows the structure of the 1st type vacuum switchgear used as a prior art. It is sectional drawing which shows the structure of the 2nd type vacuum switchgear used as a prior art.

Explanation of symbols

1 ... Vacuum switchgear 2 ... Vacuum container (insulating container)
2a ... end plate 2b ... end plate 3 ... insulating cylinder (vacuum valve)
DESCRIPTION OF SYMBOLS 4 ... Fixed conductor 4a ... Fixed electrode 5 ... Movable conductor 5a ... Movable electrode 5b ... Electrode protrusion 6 ... Connection conductor 6a ... Sliding contact 7 ... Insulator 8 ... Vacuum sealing part 9 ... Guide 10 ... Operation means (insulation operation) means)
DESCRIPTION OF SYMBOLS 11 ... Arc shield 12 ... Actuator 13 ... Bus side terminal 14 ... Load side terminal 15 ... Insulation mold part 16 ... Blocking part 17 ... Link part Gin ... Interelectrode gap (the one closer to the axis of symmetry)
Gout ... Gap between electrodes (the one far from the axis of symmetry)

Claims (5)

A pair of vacuum containers each including an insulating cylinder, each of which is composed of a movable conductor, a movable electrode, a fixed conductor, and a fixed electrode, and is arranged so as to be movable in parallel in the vacuum container; A blocking portion; a connection conductor that electrically connects the two movable electrodes inside the vacuum vessel; and an operating means that is connected to the connection conductor and operates the movable electrode from outside the vacuum vessel, In a vacuum switchgear that simultaneously opens the pair of interrupting parts connected in series to interrupt current,
In the pair of interrupting units connected in series, the movable electrode is separated from the fixed electrode by the operating means when the current is interrupted, and is disposed on at least one of the opposing surfaces of the movable electrode and the fixed electrode. A vacuum switchgear characterized by comprising means for fixing the place of welding that occurs when current is applied. 2. The vacuum switchgear according to claim 1, wherein the welding location fixing means is provided symmetrically with respect to an axis of symmetry of the pair of blocking portions on at least one of the opposing surfaces of the movable electrode and the fixed electrode. A vacuum switchgear characterized by an inclination. 3. The vacuum switchgear according to claim 2, wherein an inclination provided on at least one of the opposing surfaces of the movable electrode and the fixed electrode is such that the movable electrode and the fixed electrode are in the closed state of the pair of blocking portions. The vacuum switchgear is characterized in that the gap between them increases as the distance from the symmetry axis increases. 2. The vacuum switchgear according to claim 1, wherein the welding location fixing means is a two-stage surface comprising a projecting portion and a flat portion on at least one of the opposing surfaces of the movable electrode and the fixed electrode. Vacuum switchgear characterized by 5. The vacuum switchgear according to claim 4, wherein a protrusion provided on at least one of the opposing surfaces of the movable electrode and the fixed electrode is configured so that the movable electrode and the fixed electrode are in a closed state of the pair of blocking portions. The vacuum switchgear is characterized in that the gap between them increases as the distance from the symmetry axis increases.

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