JP2000357441A - Switchgear - Google Patents

Abstract

(57) [Problem] To provide a switchgear capable of reducing the overall shape by simplifying the structure by combining the functions of each device. SOLUTION: In a switchgear which constitutes a power supply system by housing various opening and closing devices in a sealed container 10,
A shutoff means 20 comprising a three-phase vacuum valve 12, an opening and closing operation means 18 for opening and closing a pair of electrodes provided on both axial sides of each vacuum valve 12, The main circuit conductors 15 and 19 are connected to the power supply side conductor 13 that supplies power to the main circuit conductor 15 of the vacuum valve 12 and the load side conductor 26 that is supplied with power from the main circuit conductor 19 by moving the main circuit conductors 15 and 19. / Disconnection operating means 28 for performing dissociation

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a switchgear which accommodates a switching device such as a circuit breaker or a disconnector to constitute a power supply system.

[0002]

2. Description of the Related Art FIG. 6 is a single-line diagram showing a power supply system of a switchgear of this type conventionally used.

[0003] Fig. 7 is an overall configuration diagram of the switchgear.

That is, as shown in FIG. 6, a conventional switchgear has a main circuit which receives power from a cable head CH and is connected to a circuit breaker CB via a disconnector DS and a grounding device ES. The circuit breaker CB is connected to a bus BUS on the load side via a disconnector DS and a grounding device ES similar to those on the power receiving side, and is connected to another panel.

[0005] In the switchgear, these devices are arranged as shown in FIG. That is, the switchgear 50 is used to move the container 51 whose outer periphery is surrounded by a steel plate to the partition wall 5.
2, a circuit breaker 55 equipped with a vacuum valve is housed in a circuit breaker room 53 in the front, and a busbar room 5 in the rear
In FIG. 4, disconnectors 56a and 56b having the same shape are provided on the upper and lower sides, respectively, in accordance with the upper and lower main circuits on the circuit breaker 55 side.

[0006] The disconnector 56a is connected to a bus 61 fixed to the support insulator 60, and the bus 61 is connected to an adjacent board. Further, the disconnecting switch 56b is connected to a cable head 63 that receives power from the power cable 62. A connection conductor 58 is provided between the disconnector 56a and the bus 61 and between the disconnector 56b and the cable head 63.
c and 58d.

As described above, the partition wall 52 that partitions the power supply side and the load side is provided with a through hole (not shown). Then, insulating spacers 59a and 59b in which the connection conductors 58a and 58b are molded with an insulating layer are provided in the through holes to separate the circuit breaker room 53 from the busbar room 54.

Although a grounding device is not shown in FIG. 7, the disconnecting switch 56a includes a load-side connecting conductor 58a,
In the disconnecting switch 56b, the grounding is performed by bringing the contact provided on the grounding portion into contact with the connection conductor 58b on the power supply side by circular motion or linear motion.

In the conventional switchgear, the power supply system is configured as described above, and power supply on the power receiving side and the load side is performed stably.

[0010]

However, such a conventional switchgear has the following problems.

Each of these devices constituting the switchgear includes:
As disclosed in Japanese Patent Application Laid-Open No. Hei 8-22124, it is required that each device has a specific function such as blocking or disconnection, and that each device be standardized.

Therefore, the circuit breaker 55 and the disconnectors 56a, 5a
Storage devices such as 6b have these functions by themselves,
In addition, they are rationally arranged in the container 51.

However, even if these devices are rationally arranged, since these devices are connected by the connection conductors 58a to 58d, the location of the connection conductors 58a to 58d and the connection conductors 58a to 58d can be changed. A space is needed to perform the work of connecting to the server.

Although each device itself has a sufficient withstand voltage characteristic by sufficiently suppressing the electric field, the connection conductor 58
In places where a to 58d are connected, it is necessary to take a total countermeasure for electric field relaxation in consideration of articles such as bolts. Therefore,
At a place where the connection conductors 58a to 58d are connected, an additional attachment of an electric field relaxation shield having an appropriate curvature is also required.

Further, in a portion where the devices are not arranged linearly, for example, the disconnectors 56a,
6b and the connecting conductor 5 between the insulating spacers 59a, 59b
As in the case of 8a and 58b, bending may be required.

For this reason, the conventional switchgear has a limit in downsizing. As a result, when arranging the conventional switchgear, there is a problem that it is necessary to secure a relatively wide arrangement place, and there is a case where the arrangement place is restricted. This problem is particularly noticeable when many switch gears are arranged.

The present invention has been made in view of such circumstances, and a switchgear capable of reducing the overall shape by combining the functions of each device and simplifying the structure. The purpose is to provide.

[0018]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures.

That is, according to the first aspect of the present invention, in a switchgear constituting a power supply system by housing various switching devices in a sealed container, a three-phase vacuum valve and an axial direction of each vacuum valve are provided. Power supply to the main circuit conductor of the vacuum valve by moving the blocking means along the axial direction, comprising a blocking means provided with opening and closing operation means for opening and closing a pair of electrodes provided on both sides of the vacuum valve; Disconnection operating means for connecting / disconnecting the main circuit conductor and the load side conductor supplied with power from the power supply side conductor and the main circuit conductor;

Therefore, in the switchgear according to the first aspect of the present invention, the connection / disconnection with the main circuit conductor can be performed by moving the blocking means along the axial direction of the vacuum valve.

According to a second aspect of the present invention, in the switchgear according to the first aspect of the present invention, a grounding terminal is provided in the breaking means, and the breaking means is moved along the axial direction by a disconnection operation means, so that the grounding terminal is connected to the power supply. Grounding is performed by connecting the conductor and the load-side conductor.

Therefore, in the switchgear according to the second aspect of the present invention, grounding can be performed by moving the shut-off means along the axial direction of the vacuum valve.

According to a third aspect of the present invention, in the switchgear according to the first or second aspect, each of the three-phase vacuum valves is arranged so that their axial directions are parallel to each other and in a horizontal line. A pair of connecting portions where the main circuit conductor of each vacuum valve is connected to the power supply side conductor and the load side conductor are arranged on the back side of the container in the vacuum valve arranged in the middle phase,
In the case of the vacuum valves arranged at both ends, the vacuum valves are arranged substantially on the side of the container.

Therefore, in the switchgear according to the third aspect of the present invention, the distance between the connection portion between the power supply side and the load side in each phase can be increased. Further, the connection state of the connection portion can be directly confirmed from the viewing window.

According to a fourth aspect of the present invention, in the switchgear according to the first or second aspect, each of the three-phase vacuum valves has an axial direction parallel to each other and two of the three phases horizontal. Arranged in a row, a pair of connecting parts where the main circuit conductor of each vacuum valve is connected to the power supply side conductor and the load side conductor, the vacuum valve arranged in the middle phase is arranged on the back side of the container, In the case of the vacuum valves arranged at both ends, the vacuum valves are arranged substantially on the side of the container.

Therefore, in the switchgear according to the fourth aspect of the present invention, the distance between the connection portion between the power supply side and the load side in each phase can be increased. Further, the connection state of the connection portion can be directly confirmed from the viewing window.

According to a fifth aspect of the present invention, in the switchgear according to the first or second aspect, each of the three-phase vacuum valves is arranged so that their axial directions are parallel to each other and in a horizontal line. A pair of connecting portions where the main circuit conductor of each vacuum valve is connected to the power supply side conductor and the load side conductor are arranged on the back side of the container in the vacuum valve arranged in the middle phase,
Vacuum valves arranged at both ends are arranged on the front side of the container.

Therefore, in the switchgear according to the fifth aspect of the present invention, the distance between the connection between the power supply side and the load side in each phase can be increased. Further, the connection state of the connection portion can be directly confirmed from the viewing window.

According to a sixth aspect of the present invention, in the switchgear of the first or second aspect, each of the three-phase vacuum valves is arranged such that the axial directions thereof are parallel to each other and two of the three phases are lateral. Arranged in a row, a pair of connecting parts where the main circuit conductor of each vacuum valve is connected to the power supply side conductor and the load side conductor, the vacuum valve arranged in the middle phase is arranged on the back side of the container, Vacuum valves arranged at both ends are arranged on the front side of the container.

Therefore, in the switchgear according to the sixth aspect, the distance between the connection portion between the power supply side and the load side in each phase can be increased. Further, the connection state of the connection portion can be directly confirmed from the viewing window.

According to a seventh aspect of the present invention, there is provided the switchgear according to any one of the first to sixth aspects, wherein an electromagnetic actuator is used for the opening / closing operation means.

Therefore, in the switchgear according to the seventh aspect of the present invention, the size of the shutoff means can be reduced by using an electromagnetic actuator as the operation mechanism used for the open / close operation means.

[0033]

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

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view showing an example of a switchgear according to an embodiment of the present invention, and is a side sectional view in a state where it is connected to a power supply.

FIG. 2 is a plan sectional view showing an example of the switchgear shown in FIG.

That is, the switchgear according to the present embodiment is a three-phase vacuum valve 12 provided inside the housing 10.
(12a-12c) and each vacuum valve 12 (12a
To 12c) and a main circuit conductor for conducting current.

The switchgear according to the present embodiment is shown in FIG.
As shown in FIG. 2, three-phase cable heads 11 (11 a to 11 c) are arranged in a horizontal line on the side surface of the rectangular casing 10. Cable head 11 of each phase (11a to 11a)
c) is connected to the power cable 31 respectively,
The switch gear receives power from the power cable 31.

The cable head 11 (11a) of each phase
To 11c) are connected to the conductors 13 (13a to 13c), respectively. In addition, each conductor 13 (13a-1
The periphery of 3c) is insulated by molding with an epoxy resin or the like as shown by hatching in FIG.

Further, each of the conductors 13 (13a to 13a)
(c) is connected to the movable-side conductor 15 and the movable shaft 16 provided in each of the vacuum valves 12 (12a to 12c) via the respective connection portions 22 (22a to 22c).

The middle-phase vacuum valve 12b is connected to the connecting portion 22b on the cable head 11b side. On the other hand, the vacuum valves 12a and 12c at both ends are connected to the cable heads 11a and 11c at both ends via connection portions 22a and 22c on the side surface of the housing 10, respectively.

On both sides of the front surface of the housing 10, there are provided viewing windows 32 made of transparent plastic so that the connection state of the connection portions 22a and 22c can be directly visually confirmed.

The vacuum valve 12 (12a to 12c)
The movable-side conductor 15 and the movable shaft 16 provided for each
Electricity is supplied by a multi-band (not shown).

On the other hand, each vacuum valve 12 (12a-1
The fixed-side conductor 19 in 2c) is connected to the connection part 23.
The connection part 23 can be connected to the conductor 26.
The conductor 26 is connected to a bus (not shown) to connect to an adjacent board. In addition, the periphery of the conductor 26 is insulated by molding with an epoxy resin or the like as shown by a hatched portion shown in FIG.

The vacuum valves 12 (12a-1) provided for each phase
2c) are arranged in a horizontal row, and each vacuum valve 1
2 (12a to 12c) is molded with an epoxy resin or the like (hatched portions in FIGS. 1 and 2), thereby constituting a vacuum valve portion 14 in which the phases are insulated.
A part of the outer surface of the vacuum valve part 14 includes a ground terminal 24,
25.

The movable shaft 16 of the vacuum valve 12 is connected to a shut-off operation section 18 via an insulating rod 17, and opens and closes an electrode (not shown) of the vacuum valve 12.

The vacuum valve 12 and the shut-off section 18 are fastened by bolts or the like (not shown) in the insulating cylinder 21 to form the shut-off section 20 integrally. The insulating cylinder 21 has a partial opening 33 for assembling each device housed in the switchgear, and the movable side conductor 15 is insulated (hatched in FIG. 1) by integral molding. ing.

On the other hand, the housing 10 has a disconnection operation unit 28 at the bottom.
It has. A rod 27 connects the disconnection operation unit 28 and the blocking unit 20. The blocking unit 20 can be moved vertically with respect to the housing 10, that is, only along the axial direction, and the disconnection operation unit 28 moves the blocking unit 20 up and down along the axial direction.

Next, such a disconnected state of the switchgear will be described with reference to FIG.

FIG. 3 is a view showing an example of the switchgear according to the embodiment of the present invention, and is a sectional side view in a disconnected state.

That is, as shown in FIG. 3, the switchgear of the present embodiment moves the breaking section 20 downward in the axial direction by the disconnection operation section 28 from the connection state shown in FIG. 22 and 23 are movable-side conductors 15, respectively.
It is in a state of being dissociated from the fixed portion conductor 19. This is for example
This can be easily realized by providing a screw at the tip of the rod 27 and rotating the female screw side with a motor.

In the disconnected state shown in FIG.
Since two and 23 dissociate at the same time, a two-point gap occurs, and the vacuum valve section 14 has an intermediate potential. The potential is determined by the capacitance of each of the upper and lower gaps.
0%.

Next, the grounding state of the switchgear will be described with reference to FIG.

FIG. 4 is a diagram showing an example of the switchgear according to the embodiment of the present invention, and is a side sectional view in a grounded state.

That is, as shown in FIG. 4, the switchgear of the present embodiment further moves the breaking section 20 further downward in the axial direction from the disconnecting state shown in FIG. In this state, the terminals 24 and 25 are connected to the connection portions 22 and 23.

This state can be easily realized, for example, by providing a screw at the tip of the rod 27 and rotating the female screw side with a motor, as in the disconnected state.

Thus, the power supply side and the load side such as the bus are grounded. In addition, the connection parts 22 and 23 are connected to the ground electrode by a conductor (not shown).

Further, by moving the blocking unit 20 upward along the axial direction by the disconnection operation unit 28 from the grounding state, the disconnection and the connection state are similarly performed.

As described above, the switchgear according to the present embodiment moves the shutoff section 20 up and down along the axial direction by the disconnection operation section 28, thereby connecting the state of the vacuum valve 12 to the connection, disconnection, and grounding. Switch to each state.

Next, the operation of the switchgear of the present embodiment configured as described above will be described.

According to the switchgear of the present embodiment, the disconnection operating section 28 moves the shutoff section 20 in the vertical direction along the axial direction, so that the movable side conductor 15 and the fixed side conductor 19 of the vacuum valve 12 The conductors 13 and 26 on the power supply side and the load side are simultaneously connected or disconnected to form a disconnection portion having a two-point gap configuration.

As a result, the blocking portion 20 moves downward along the axial direction, and the connection portions 22 and 23 formed at the time of dissociation are formed.
The gap length between the movable-side conductor 15 and the fixed-side conductor 19 is twice as long as that when only one of the power supply side and the load side is dissociated, and about twice the dielectric strength is obtained. That is, by simultaneously dissociating both the power supply side and the load side, it is possible to reduce the moving distance of the breaking unit 20 for realizing the disconnection state.

Further, by further moving vertically along the axial direction, the ground terminal 2
The power supply side and the load side are grounded by connecting the connection portions 4 and 25 to the connection portions 22 and 23.

As described above, the connection, disconnection, and grounding of the switchgear of this embodiment are all performed by the disconnection operation section 28, and no other mechanism is required. Therefore, the structure is simplified.

On the other hand, due to the structure of the switchgear, it is inevitable that some metal exposed portions remain in the connecting portions 22 and 23, thereby deteriorating the insulation characteristics. Therefore, an additional insulator measure or the like is required in this portion, and the structure becomes complicated.

However, in the switchgear according to the present embodiment, the three-phase vacuum valves 12a, 12b, 12c
Are arranged so that the separation distance between the connection portions 22a, 22b, and 22c corresponding to. for that reason,
High dielectric strength is maintained even if there is some exposure of the metal part.

Further, since the connection portions 22a and 22c of the both-end phases are not on the back side but on the side surface of the vacuum valve portion 14, the connection state can be visually confirmed through the viewing window 32 on the front of the panel.

As described above, in the switchgear of this embodiment, the overall shape can be reduced by simplifying the structure. In addition, since a large separation distance between the connection portions where the metal portions are exposed is ensured, it is possible to maintain high insulation. Furthermore, since the connection state can be visually checked, it is possible to improve safety.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a plan sectional view showing an example of the switchgear according to the embodiment of the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. Is described only.

The switchgear according to the second embodiment of the present invention has a three-phase vacuum valve 12 (12a to 12a).
Except for the planar arrangement shape c), the configuration is the same as that of the switchgear of the first embodiment. Therefore, the connection, disconnection, and grounding of the vacuum valve 12 are the same as those shown in FIGS. 1, 3, and 4 described in the first embodiment, and a description thereof will be omitted.

That is, the switchgear according to the present embodiment has a three-phase vacuum valve 12 (12a to 12a) in a housing 10 as shown in FIG.
c) is arranged in a triangular shape when viewed from above along the axial direction.

As described above, the space between the three-phase vacuum valves 12a, 12b and 12c arranged in a triangular shape is molded with an epoxy resin or the like as shown by hatching in FIG. The vacuum valve section 14 is constituted.

Similarly to the first embodiment, the middle-phase vacuum valve 12b is connected to the connection portion 22b on the rear side of the housing 10, and the connection portion 2 of the vacuum valves 12a and 12c at both ends is connected.
2a and 22c are respectively connected to conductors 13a and 13c molded on the side surface of the housing 10 with epoxy resin or the like. Further, on both sides of the front surface of the housing 10, there are provided viewing windows 32 made of transparent plastic.
The connection states of a and 22c can be directly visually confirmed.

As described above, in the switch gear of the present embodiment, the vacuum valves 14 (12a to 12c) formed by triangular arrangement of the vacuum valves 12 (12a to 12c) and the vacuum valves 12 (12a to 12c) 12c), three vacuum valves 12
Since a, 12b, and 12c can be densely arranged, it is possible to further reduce the overall shape.

Moreover, the separation distance between the connecting portions 22a, 22b, and 22c, where metal exposure is unavoidable due to the configuration, can be made large as shown in the figure, so that a high dielectric strength can be maintained. Become.

Further, since the connection state of the connection portions 22a and 22c at both ends can be visually confirmed through the viewing window 32, safety can be improved.

In this embodiment, as shown in FIG. 5, an example has been described in which the connection portions 22a and 22c of the two-phase are arranged on the side surface of the housing 10. However, only the connection portion 22b of the medium phase is provided in the housing. Connected to the back side of the body 10 and connected to the connecting portions 22a and 22
c may be connected to the front side of the housing 10. in this case,
Since the distance between the connection portions 22a, 22b, and 22c is further increased, a higher dielectric strength is realized.

The shut-off operation unit 18 in each of the above embodiments may use a conventionally used mechanical operation mechanism, but may use an electromagnetic actuator constituted by using a permanent magnet, an electromagnet, and a spring. (For example, Japanese Patent Application No. Hei 10-59)
557) may be used.

When an electromagnetic actuator is used, it can be designed to be very compact as compared with a conventional mechanical operating mechanism, and therefore, the height of the interrupting section 20 can be considerably reduced. Therefore, when the height of the housing 10 is fixed, a large vertical movement distance of the blocking unit 20 is secured, and a switchgear with further improved insulation performance can be realized.

The sealed container, the opening / closing operation means, the shutoff means, and the disconnection operation means referred to in the claims correspond to the housing 10, the interruption operation section 18, the interruption section 20, and the disconnection operation section 28 in the above embodiments. Each corresponds. Further, the main circuit conductor of the vacuum valve referred to in the claims is the movable-side conductor 15 and the fixed-side conductor 19 in each of the above embodiments, the power supply-side conductor is the conductor 13 in each of the above-mentioned embodiments, and the load-side conductor is the Each of the above embodiments corresponds to the conductor 26.

[0082]

As described above, according to the switchgear of the present invention, since the functions of the respective devices are combined to simplify the structure, it is possible to reduce the overall shape. A switch gear can be realized.

[Brief description of the drawings]

FIG. 1 is an example of a switchgear according to a first embodiment of the present invention, which is a side sectional view in a state where the switchgear is connected to a power supply.

FIG. 2 is a plan sectional view showing an example of the switchgear according to the first embodiment of the present invention.

FIG. 3 is a side sectional view showing an example of the switchgear according to the first embodiment of the present invention in a disconnected state.

FIG. 4 is a side sectional view showing an example of the switchgear according to the first embodiment of the present invention and in a grounded state.

FIG. 5 is a plan sectional view showing an example of a switchgear according to a second embodiment of the present invention.

FIG. 6 is a single-line diagram showing a power supply system of a conventionally used switchgear.

FIG. 7 is an overall configuration diagram of a conventionally used switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing | casing, 11 ... Cable head, 12 ... Vacuum valve, 13, 26 ... Conductor, 14 ... Vacuum valve part, 15 ... Movable side conductor, 16 ... Movable shaft, 17 ... Insulating rod, 18 ... Shut-off operation part, 19 ... Fixed-side conductor, 20 ... Interruption part, 21 ... Insulation cylinder, 22,23 ... Connection part, 24,25 ... Ground terminal, 27 ... Rod, 28 ... Disconnection operation part, 31 ... Power cable, 32 ... Peeping window, 33 ... Opening.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Junichi Ikeda 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu factory of Toshiba Corporation (reference) 5G017 AA23 JJ01

Claims (7)

[Claims] 1. A switchgear comprising a power supply system in which various switching devices are housed in a sealed container, comprising: a three-phase vacuum valve; and a pair of vacuum valves provided on both axial sides of each vacuum valve. And a power supply-side conductor that supplies power to a main circuit conductor of the vacuum valve by moving the cut-off means along the axial direction. A switchgear comprising: a load-side conductor receiving the supply of power from a main circuit conductor; and disconnection operation means for connecting / disconnecting the main circuit conductor. 2. The switchgear according to claim 1, further comprising: a ground terminal provided in the breaking unit, wherein the breaking unit is moved along the axial direction by the disconnection operation unit, so that the ground terminal and the power supply are turned off. A switchgear, wherein grounding is performed by connecting a side conductor and the load-side conductor. 3. The switchgear according to claim 1, wherein each of the three-phase vacuum valves is arranged so that their axial directions are parallel to each other and in a horizontal line. The main circuit conductor of each vacuum valve is connected to the power supply-side conductor and the load-side conductor, and a pair of connecting portions is disposed on the back side of the container in the vacuum valve disposed in the middle phase, and disposed at both ends of the phase. A switchgear, wherein the vacuum valve is disposed substantially on the side of the container. 4. The switch gear according to claim 1, wherein each of the three-phase vacuum valves has an axial direction parallel to each other, and two of the three phases are arranged in a horizontal line. And a pair of connecting portions where the main circuit conductor of each of the vacuum valves is connected to the power supply side conductor and the load side conductor,
A switchgear, wherein a vacuum valve disposed in the middle phase is disposed on the back side of the container, and a vacuum valve disposed in both end phases is disposed substantially on the side surface of the container. 5. The switchgear according to claim 1 or 2, wherein each of the three-phase vacuum valves is arranged so that their axial directions are parallel to each other and in a horizontal line. The main circuit conductor of each vacuum valve is connected to the power supply-side conductor and the load-side conductor, and a pair of connecting portions is disposed on the back side of the container in the vacuum valve disposed in the middle phase, and disposed at both ends of the phase. A switchgear, wherein the vacuum valve is disposed on the front side of the container. 6. The switchgear according to claim 1, wherein each of the three-phase vacuum valves has an axial direction parallel to each other, and two of the three phases are arranged in a horizontal line. And a pair of connecting portions where the main circuit conductor of each of the vacuum valves is connected to the power supply side conductor and the load side conductor,
A switch gear, wherein a vacuum valve arranged in the middle phase is arranged on the back side of the container, and a vacuum valve arranged in both end phases is arranged on the front side of the container. 7. The switch gear according to claim 1, wherein an electromagnetic actuator is used for the opening / closing operation means.