JP4458856B2 - Compound insulation switchgear - Google Patents

Description

  The present invention relates to a composite insulated switchgear.

  The conventional composite insulated switchgear has one end of the vacuum interrupter connected to the bus via a vacuum or gas disconnection part, and the other end of the vacuum interrupter serving as the external coupling part of the main circuit is connected to the vacuum or gas ground. Connected to the grounding terminal via the switching part, and the vacuum shutoff part, disconnection part, grounding switching part, busbar, and external coupling part of the main circuit are integrated into a single phase or three phases with an insulator having a grounding layer on the surface. In addition, the vacuum shut-off part, the disconnecting part, and the ground opening / closing part are provided with operation mechanisms for opening and closing each of them. (For example, refer to Patent Document 1).

JP 2002-152930 A (paragraph 0020, FIG. 1)

  Since the conventional composite insulation switchgear is configured as described above, the vacuum breaker, the disconnection part, and the ground opening / closing part are provided for each circuit required by an insulator having a grounding layer on the surface for the purpose of downsizing. When three-phase components are integrally molded, it is necessary to arrange these three-phase integral molds side by side in the width direction of the board, and there is a problem that the board width cannot be reduced. In addition, since the three phases are molded integrally, there is a problem that when an accident occurs in the mold, a three-phase short circuit accident may occur.

  On the other hand, when molding is performed for each phase, a ground fault is given priority and a three-phase short-circuit accident is not caused, but there is a problem that it is inferior to the case of a three-phase integral mold in terms of miniaturization. Furthermore, since the insulated operating rod is connected to the movable conductor in the air for electrical insulation between the movable conductor of the vacuum valve and the operating device, a sufficient insulation distance in the air at the insulated operating rod portion. Therefore, there is a problem in that there is a limit to miniaturization in the longitudinal direction of the operation rod or the height direction of the vacuum valve.

  The present invention has been made to solve the above-described problems. Along with the downsizing of the composite insulating switch gear, particularly the downsizing of the panel in the width direction, there is no charging exposed part, leading to a three-phase short circuit accident. The purpose of this invention is to provide a composite insulation switchgear that has no ground fault and is highly safe.

A composite insulation switchgear according to the present invention includes a vacuum vessel, a fixed electrode and a movable electrode that constitute a main circuit opening / closing portion in the vacuum vessel, and supports the movable electrode, and through an insulator for preventing energization. A plurality of first electrodes each having a movable electrode rod coupled to an operating device outside the vacuum vessel, and a flexible conductor connecting the movable electrode rod to an external connection conductor for extracting current provided in the vacuum vessel . the vacuum valve, with the central axes of the movable electrode rod is arranged so as to be positioned on a predetermined straight line, and a movable electrode rod is ground conductor and the fixed electrode rod connected by connecting conductors to said fixed electrode A plurality of second vacuum valves each having a ground opening / closing portion that contacts and separates are arranged such that the central axis of each movable electrode rod is positioned on another predetermined straight line parallel to the predetermined straight line. Movable electrode rod of vacuum valve Each disposed so as to be positioned between the movable electrode rod of the first vacuum valve adjacent said plurality of first and second vacuum valves, each external connection conductors of said plurality of first vacuum valve a bus for connecting the mutually with integrally cast with the resin, subjected to a conductive treatment for grounding on the surface of the resin, with the mold of the composite insulated switchgear for one phase, the conductive section The ground potential is used.

  Since the composite insulation switchgear according to the present invention is configured as described above, the composite insulation switchgear can be miniaturized, and there is no charge exposure part, leading to a three-phase short-circuit accident, and a ground fault. Safety can be improved with priority.

Embodiment 1 FIG.
Hereinafter, the composite insulated switchgear which is Embodiment 1 of this invention is demonstrated concretely based on figures.
FIG. 1 is a plan view showing a schematic configuration of a one-phase composite insulated switchgear according to the first embodiment, which includes three vacuum valves having a main circuit opening / closing portion and two vacuum valves having a ground opening / closing portion. An example is shown. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 4 is an electric circuit diagram according to the first embodiment. In each case, the same parts are denoted by the same reference numerals.

  As shown in FIG. 1, three first vacuum valves 1 having a main circuit opening / closing part (details will be described later) and two second vacuum valves 2 having a ground opening / closing part (details will be described later). A composite insulated switchgear for one phase is configured, and the first vacuum valve 1 has a central axis (specifically, a central axis of a movable electrode rod, which will be described later) viewed from the upper surface thereof positioned on a predetermined straight line 3. The second vacuum valve 2 is arranged on another predetermined straight line 4 having a central axis (specifically, a central axis of a movable electrode rod described later) viewed from the upper surface parallel to the straight line 3. The first vacuum valve 1 and the second vacuum valve 2 are disposed so as to be located, and the respective central axes of the second vacuum valves 2 are positioned between the adjacent first vacuum valves 1. Are arranged in a zigzag pattern as a whole.

Further, the three first vacuum valves 1, the two second vacuum valves 2, the bus 5 that connects the first vacuum valves to each other, and a load that serves as a current extraction port to be described later of the first vacuum valve 1. The side conductor 6 and the connecting conductor 7 connecting the second vacuum valve 2 and the first vacuum valve 1 are integrally cast with resin to form a mold 10 to reduce the size while ensuring the necessary resin thickness. I am trying.
Conductive treatment 11 is applied to the surface of the mold 10, and the surface of the conductive treatment 11 is set to the ground potential. Details of the mold 10 will be described later.

  The first vacuum valve 1 shown in FIG. 1 is coupled to a metal vacuum vessel 20 and one end of the metal vacuum vessel 20, that is, the lower end in the figure, as shown in detail in FIGS. The first insulator container 30 and the second insulator container 40 coupled to the other end of the metal vacuum container 20, that is, the upper end in the figure. In the first insulator container 30, a fixed electrode 32 and a movable electrode 33 forming a main circuit opening / closing part 31 are disposed. The fixed electrode 32 is supported by a fixed electrode bar 34, and the fixed electrode bar 34 is sealed. It is fixed to the first insulator container 30 via the attachment member 35.

  The movable electrode 33 is supported by a movable electrode rod 36 that penetrates the metal vacuum vessel 20, and the movable electrode rod 36 is interposed through an insulator 41 for preventing current from flowing in a second insulator container 40. The operating rod 42 is coupled to the operating device 50, and the operating device 50 can be driven in the vertical direction in FIG. 2 or FIG.

In the second insulator container 40, one end of the bellows 43 is fixed to the operation rod 42, and the other end of the bellows 43 is fixed to the second insulator container 40 via the sealing member 44. The operation rod 42 and the movable electrode rod 36 can be driven while maintaining the vacuum, and the main circuit opening / closing portion 31 composed of the movable electrode 33 and the fixed electrode 32 can be opened and closed.
Note that the first and second insulator containers 30 and 40 and the insulator 41 that couples the movable electrode rod 36 and the operation rod 42 must withstand the high temperature conditions during vacuuming and brazing when the vacuum valve is manufactured. Therefore, it is made of, for example, alumina ceramic.

A copper terminal 21 is provided on the inner surface of the metal vacuum vessel 20. A flexible conductor 22 is provided between the copper terminal 21 and the movable electrode rod 36 so as to be able to follow the deformation corresponding to the electrical connection between them and the opening / closing operation of the main circuit opening / closing portion 31. .
The metal vacuum vessel 20 may be entirely made of copper. The copper terminal 21 is provided with one external connection conductor 23 or two axisymmetrically so that the first vacuum valve 1 and an external conductor such as a bus bar can be connected, and the adjacent first conductors 23 are connected to each other. The external connection conductors 23 of the vacuum valve 1 are connected to each other by a bus 5.

  Further, as shown in FIG. 3, the second vacuum valve 2 includes a fixed electrode 62 and a movable electrode 63 that form a ground opening / closing part 61 in an insulator container 60 such as alumina ceramic. Is supported by a fixed electrode rod 64 serving as a non-ground side terminal. The fixed electrode rod 64 is fixed to the insulator container 60 via a sealing member 65 and is connected to the first vacuum valve 1 via a connecting conductor 7. It is connected to the fixed electrode bar 34. Accordingly, by adjusting the length and position of the connection conductor 7, the position of the second vacuum valve 2 can be arbitrarily changed, so that it can be flexibly handled according to the size of the second vacuum valve 2. be able to.

Connection by the connection conductor 7 is performed by means such as bolt fastening, junction connection, or brazing.
The movable electrode 63 is supported by a movable electrode rod 67 that is a ground conductor, and the outer end of the movable electrode rod 67 extends to the same side as the operation rod 42 of the first vacuum valve 1, and is connected to an operation device (not shown). It is connected and can be driven in the vertical direction in the figure by this operating device.

Note that one end of the bellows 68 is fixed to the movable electrode rod 67, and the other end of the bellows 68 is fixed to the insulator container 60 via the sealing member 69, so that the movable electrode is maintained while maintaining the vacuum in the container. The rod 67 can be driven, and the ground opening / closing part 61 can be opened / closed.
The first and second vacuum valves 1 and 2 configured as shown in FIG. 3 constitute a composite insulated switchgear for one phase and one circuit.

FIG. 4 shows an electric circuit diagram of a composite insulation switchgear for one phase constituted by providing two sets of composite insulation switchgear for one phase and one circuit shown in FIG.
The procedure for realizing such an electrical connection is to connect the load-side conductor 6 constituting the load-side terminal as the current extraction portion to the fixed electrode rod 34 of the first vacuum valve 1 and three first vacuums. After connecting the external connection conductors 23 of the valve 1 with the bus 5, the whole is integrally cast with resin, and a bushing 8 is formed at the tip of the load-side conductor 6 to constitute the mold 10.

In this case, if the bus bar 5 is made of a flexible conductor, it is possible to absorb the deviation during the assembly operation and to follow the shrinkage of the resin of the mold 10, so that the stress concentration can be reduced.
The load-side conductor 6 is arranged on the same axis as the first vacuum valve 1, that is, on the same axis as the fixed electrode rod 34, so that the structure inside the mold 10 can be simplified, and the height The direction can be miniaturized. Of course, it may be formed integrally with the fixed electrode rod 34.

  In the above configuration, when two or more of the main circuit opening / closing sections 31 of the three first vacuum valves 1 are closed, the current is the load side conductor 6 -the fixed electrode bar 34 -the fixed electrode 32 -the movable electrode 33. -Movable electrode rod 36-flexible conductor 22-copper terminal 21 of metal vacuum vessel-external connection conductor 23-bus bar 5-outside of another first vacuum valve 1 in which the main circuit opening / closing part 31 is closed Electricity is supplied through the path of the connecting conductor 23-the copper terminal 21 of the metal vacuum vessel-the flexible conductor 22-the movable electrode bar 36-the movable electrode 33-the fixed electrode 32-the fixed electrode bar 34-the load side conductor 6.

  An operation of opening and closing each of the operation rod 42 of the first vacuum valve 1 and the movable electrode rod 67 of the second vacuum valve 2 by concentrating them in a predetermined direction, for example, upward in FIGS. Since the devices 50 can be combined in one place, mutual interlocking can be easily achieved, the configuration can be simplified, and the operation device 50 can be reduced in size.

Moreover, since the dimension between the circuits can be reduced by integrally casting the one configured as described above with resin and embedding the bus bar 5, the size in the width direction of the panel can be reduced. At the same time, the manufacturing cost can be reduced by forming the bushing structure 8 on the load-side conductor 6 serving as a current extraction port.
Of course, the shapes of the three bushings 8 do not have to be the same. Furthermore, the entire device can be miniaturized by embedding a voltage sensor, a current sensor and the like provided as necessary.

  Conductive treatment 11 is applied to the surface of the mold 10 manufactured by this integral casting, and a highly safe composite insulated switchgear without a charge exposed portion can be formed by setting the conductive treatment portion to a ground potential. it can. The conductive treatment 11 is performed by metal spraying, application of a conductive paint, or the like, and is performed on a surface other than the bushing 8 at a connection portion with a cable or the like. In the example of FIGS. 1 to 3, the operating rod 42 of the first vacuum valve 1 and the movable electrode rod 67 of the second vacuum valve 2 are set to the ground potential. Since it becomes a place which cannot be touched, the upper surface of the mold 10 shown in FIG.

  The first and second insulator containers 30 and 40 of the first vacuum valve 1 and the insulator container 60 of the second vacuum valve 2 are usually made of alumina ceramic as described above. Since the digits of the thermal expansion coefficient differ from each other, the minimum wall thickness from the first and second insulator containers 30 and 40 and the insulator container 60 to the surface of the mold 10 from the viewpoint of thermal stress generation due to thermal history. The relationship between C (FIG. 1) and the minimum distance D (FIG. 1) between the insulator containers is C <D, which improves the mechanical reliability of the mold 10 with respect to heat.

As described above, the surface of the mold 10 is subjected to the conductive treatment 11 to be grounded, and the electrical insulation between the operating device 50 and the operating rod 42 and the movable electrode rod 36 is performed by the insulator 41 disposed in a vacuum. Since it is performed, it is not affected by the surrounding environment, so that it is possible to realize a composite insulation switch with high electrical insulation performance.
In addition, by molding each phase including the bus bar 5 and conducting the conductive treatment on the surface of the mold, a structure that does not lead to a three-phase short circuit accident with priority on the ground fault is obtained.

  Note that the electric circuit diagram of FIG. 1 shows an example, and in general, it can be implemented in the same manner as described above, with n first vacuum valves 1 and m second vacuum valves 2. is there. However, m is a number of n or less.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. 5A and 5B are schematic views showing the configuration of the second embodiment. FIG. 5A is a cross-sectional view showing an example of the configuration when applied to the first vacuum valve 1, and FIG. 5B shows the configuration of the electric field relaxation shield. It is a perspective view shown.
In these drawings, the same or corresponding parts as those in FIGS.
The mold 10 including the first vacuum valve 1 and the second vacuum valve 2 has the same configuration as that shown in FIGS. The difference from FIGS. 1 to 3 is the spiral spring formed of conductive metal or resin on the outer surface of the sealing member 35 and the metal vacuum vessel 20 at both ends of the first insulator container 30. The electric field relaxation shield 70 having a donut shape by connecting both ends is provided.

  The electric field relaxation shield 70, the sealing member 35, and the metal vacuum vessel 20 have the same potential, and by making the outer diameter φF of the electric field relaxation shield 70 larger than the outer diameter φE of the first insulator container 30, Resin that is electrically necessary between the first insulator container 30 and the surface of the mold 10, for example, because it has the effect of relaxing the electric field at the tip of the triple junction of the first insulator container 30, the metal joint, and the resin. The minimum thickness of the mold 10 can be reduced, and the mold 10 can be downsized.

  In addition, since the electric field relaxation shield 70 is provided with a spring property, there is an effect that the electric field relaxation shield 70 can be in close contact with the sealing member 35 and the metal vacuum vessel 20, and the electric field relaxation shield 70 can be attached to a portion having a diameter larger than the inner diameter of the electric field relaxation shield 70. It becomes possible. The electric field relaxation shield 70 and the sealing member 35 or the metal vacuum vessel 20 are fixed by a conductive adhesive, soldering, brazing, welding, or the like. FIG. 5A shows only the configuration provided in the first insulator container 30, but the same applies to both ends of the second insulator container 40 or the insulator container 60 of the second vacuum valve 2. Needless to say, it can be configured as follows.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a plan view showing the configuration of the third embodiment. In this figure, the same or corresponding parts as in FIG.
The configuration of the mold 10 for one phase is the same as that shown in FIG. A difference from FIG. 1 is that three molds 10 for one phase are combined to form a three-phase component, and the mold 10 for each one phase is placed between the adjacent first vacuum valves 1 of the mold 10. A concave portion 10a is provided on the surface, and a convex portion 10b is provided on the surface of the mold 10 on the side facing the surface on which the concave portion 10a is provided at a position corresponding to the second vacuum valve 2, and Polymerization is performed in such a manner that the convex portion 10b of the B-phase mold 10 is pushed in, and polymerization is performed in such a manner that the convex portion 10b of the C-phase mold 10 is pushed into the concave portion 10a of the B-phase mold 10. It is a point that is connected to.

  Since the surface of each mold is subjected to a conductive treatment 11 to obtain a ground potential, it is not necessary to secure an insulation distance between the molds of each phase, so that the concave portion 10a and the convex portion 10b are sufficiently overlapped. Thus, a size twice as large as the size G shown in FIG. 6 can be reduced.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to the drawings. 7A and 7B are schematic views showing the configuration of the fourth embodiment, where FIG. 7A is a plan view and FIG. 7B is a cross-sectional view taken along line HH in FIG. In this figure, the same or corresponding parts as in FIGS. The difference from FIGS. 1 to 3 is that the structure of the second vacuum valve 2 is equivalent to that of the first vacuum valve 1, a common ground conductor 80 is connected to the external connection conductor 23, and a common ground terminal 81 is provided. The bushing structure 82 is formed at the tip of the ground terminal 81. By setting it as such a structure, the voltage of the withstand voltage test for confirming the soundness of a cable and a connection can be applied.

It is a top view which shows schematic structure of the composite insulation switchgear for 1 phase which is Embodiment 1 of this invention. It is sectional drawing of the AA in FIG. It is sectional drawing of the BB line in FIG. FIG. 2 is an electric circuit diagram of the first embodiment. It is the schematic which shows the structure of Embodiment 2 of this invention, (a) is sectional drawing which shows the example of a structure at the time of applying to a 1st vacuum valve, (b) is a perspective view which shows the structure of an electric field relaxation shield. FIG. It is a top view which shows the structure of Embodiment 3 of this invention. It is the schematic which shows the structure of Embodiment 4 of this invention, (a) is a top view, (b) is sectional drawing of the HH line in (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st vacuum valve, 2 2nd vacuum valve, 5 Busbar, 6 Load side conductor,
7 connection conductor 8, 82 bushing, 10 mold, 10a recess,
10b convex portion, 11 conductive treatment, 20 metal vacuum vessel, 22 flexible conductor,
23 external connection conductor, 30 first insulator container, 31 main circuit switching part,
32, 62 fixed electrode, 33, 63 movable electrode, 34, 64 fixed electrode rod,
35, 44, 65, 69 sealing member, 36, 67 movable electrode rod,
40 second insulator container, 41 insulator, 42 operation rod, 43, 68 bellows,
50 operation device, 60 insulator container, 61 ground opening / closing part,
70 electric field relaxation shield, 80 common ground conductor, 81 ground terminal.

Claims (9)

A vacuum vessel, a fixed electrode and a movable electrode constituting a main circuit opening / closing portion in the vacuum vessel, and the movable electrode are supported and coupled to an operating device outside the vacuum vessel via an energization blocking insulator. A plurality of first vacuum valves each having a movable electrode rod and a flexible conductor that connects the movable electrode rod to an external connection conductor for current extraction provided in the vacuum vessel . with the center axis is arranged so as to be positioned on a predetermined straight line, the plurality having a toward and away from ground switch section and the movable electrode rod is fixed electrode rod and the ground conductor connected by the connection conductor to the stationary electrode The second vacuum valve is positioned so that the central axis of each movable electrode rod is on another predetermined straight line parallel to the predetermined straight line, and the movable electrode rods of the second vacuum valve are adjacent to each other. Of the first vacuum valve Disposed so as to be located between the moving electrode rod, said plurality of first and second vacuum valves, and a bus for interconnecting between the outer connecting conductors of the plurality of first vacuum valve resin with integrally cast by, subjected to conductive treatment for grounding on the surface of the resin, with the mold of the composite insulated switchgear for one phase, characterized in that a ground potential the conductive processor complex Insulated switchgear. Said first composite insulated switchgear according to claim 1 Symbol mounting, characterized in that a power receiving cable connection and Do that current outlet to the fixed electrodes on the same axis as the vacuum valve.   The operation rod for coupling the movable electrode rods of the plurality of first vacuum valves to the operation device and the movable electrode rods of the plurality of second vacuum valves are respectively disposed on predetermined sides of the mold. The composite insulation switchgear according to claim 1 or 2, characterized in that   2. The composite insulated switchgear according to claim 1, wherein the bus bar is composed of a flexible conductor.   The minimum distance between the vacuum containers of the first and second vacuum valves disposed in the mold is set to be larger than the minimum resin thickness between the vacuum containers and the mold surface. The composite insulation switchgear according to claim 1 or 2.   The vacuum container is composed of a metal vacuum container, an insulating container fixed to both ends thereof, and a sealing member disposed at an outer end of each insulating container. The composite insulating switchgear according to claim 1 or 2, wherein an annular electric field relaxation shield is provided on an outer surface of the metal vacuum vessel and the sealing member. 7. The composite insulated switchgear according to claim 6, wherein the annular electric field relaxation shield has a conductive spring formed in a donut shape.   The second vacuum valve supports the vacuum vessel, a fixed electrode and a movable electrode constituting the ground opening / closing portion in the vacuum vessel, the movable electrode, and the vacuum via an insulator for preventing energization. A movable electrode rod coupled to an operating device outside the container; and a flexible conductor for connecting the movable electrode rod to an external connection conductor for taking out current provided in the vacuum vessel. The composite insulated switchgear according to claim 1 or 2, wherein each external connection conductor of the valve is electrically connected to form a common ground conductor.   A concave portion is formed on the surface of the mold between the plurality of first vacuum valves, and a convex portion is formed on the surface of the mold at a position corresponding to the plurality of second vacuum valves. 3. The mold of three composite phases is bonded to the concave portion of the mold of the composite insulation switchgear by superimposing the convex portion of the mold of the composite insulation switchgear for another one phase. Item 3. A composite insulated switchgear according to Item 2.

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