JP5087494B2 - Solid insulation switchgear - Google Patents

Description

  The present invention relates to a solid-insulated switchgear in which an electric device constituting a main circuit is molded with an insulating material such as an epoxy resin.

  Conventionally, there has been known a solid-insulated switchgear in which electrical devices such as vacuum valves and inter-board buses are molded with epoxy resin, and these are connected with a connection conductor molded with the same epoxy resin (for example, Patent Documents) 1).

  This type of solid insulated switchgear is shown in FIG. As shown in FIG. 3, the solid insulation switchgear is configured such that the inside of the metal box 1 is divided into a main circuit portion 1a on the back side and an operation mechanism portion 1b on the front side.

  The main circuit portion 1a is provided with a cable head 3 to which a power cable 2 is connected. An I-shaped second connection conductor 5 is connected to the cable head 3 via a Z-shaped first connection conductor 4 molded with epoxy resin. The second connection conductor 5 is connected to the fixed side of the power supply side disconnection portion 7 in which the disconnection vacuum valve 6 is molded with epoxy resin. The disconnecting vacuum valve 6 is horizontally arranged in the axial direction, and is arranged at the lowermost part of the box 1.

  On the upper part of the disconnecting vacuum valve 6, a blocking part 9 in which a blocking vacuum valve 8 arranged in the axial direction is molded with epoxy resin is spaced apart. A first movable portion 10 is provided on the movable side of the power supply side disconnection portion 7 and the cutoff portion 9, and the movable side of the disconnection vacuum valve 6 and the cutoff vacuum valve 8 is connected by a movable side conductor 11. Insulating operation rods 12 that are movable in the axial direction are connected to the movable sides of the disconnecting vacuum valve 6 and the disconnecting vacuum valve 8, respectively.

  A load-side disconnecting part in which one end of a U-shaped third connection conductor 13 molded with epoxy resin is connected to the fixed side of the blocking part 9 and the disconnection vacuum valve 14 is molded with epoxy resin at the other end 15 is connected. The load-side disconnecting part 15 is arranged horizontally in the axial direction and is arranged on the upper part of the blocking part 9. A bypass portion 17 in which the center conductor 16 is molded with an epoxy resin is disposed above the load-side disconnecting portion 15 so as to be spaced apart.

  A second movable portion 18 is provided on the movable side of the load-side disconnecting portion 15 and one end side of the bypass portion 17, and the movable side of the disconnecting vacuum valve 14 and the central conductor 16 are connected by the movable-side conductor 19. Yes. An insulating operation rod 20 that is movable in the axial direction is connected to the movable side of the disconnecting vacuum valve 14.

  One end of an L-shaped fourth connection conductor 21 molded with epoxy resin is connected to the other end of the bypass portion 17. The other end of the fourth connection conductor 21 is connected to a bus bar 22 that connects between the panels disposed at the top of the box 1.

  Here, the fourth connection conductor 21 includes an L-shaped center conductor 23, an insulating layer 24 provided around the L-shaped center conductor 23, and a ground layer 25 provided on the outer periphery thereof. And the interface connection part 26 formed in the conical convex part or the recessed part is provided in both ends, and the connection with an adjacent electric equipment is performed. The first connection conductor 4, the second connection conductor 5, and the third connection conductor 13 have the same configuration.

  The operation mechanism section 1b is provided with operation mechanisms 27 on the lower side and the upper side of the box 1, respectively connected to the insulating operation rods 12 and 20, and the disconnecting vacuum valves 6 and 14 and the shut-off vacuum valve 8 are connected to each other. Opening and closing is performed. A control room 28 monitors voltage and current and operates the operation mechanism 27.

The electric device arranged in this way becomes a power supply system as shown in FIG. CH corresponds to the cable head 3, DS1 corresponds to the power supply side disconnecting part 7, CB corresponds to the interrupting part 9, DS2 corresponds to the load side disconnecting part 15, and BUS corresponds to the bus bar 22, respectively. Depending on the power supply system, the power supply side and the load side may be reversed.
JP 2006-197730 A (second page, FIG. 8)

  The above-described conventional solid-insulated switchgear has the following problems. That is, since the power supply side disconnecting portion 7, the disconnecting portion 9, the load side disconnecting portion 15 and the like are horizontally arranged and connected by the first to fourth connection conductors 4, 5, 13, and 21, the connection work is performed. Therefore, the size of the box body 1 in the depth direction has to be increased due to space requirements and restrictions on arrangement. Further, the first to fourth connection conductors 4, 5, 13, and 21 have different outer shapes, and several types of molded products have to be prepared.

  For this reason, a main circuit connecting conductor that can connect the power supply side disconnecting portion 7, the disconnecting portion 9, the load side disconnecting portion 15 and the like in a batch, facilitates the connection work, and can reduce the dimension in the depth direction is desired. It was. In this case, it is assumed that the ground circuit priority insulation coordination can be achieved in the event of an insulation breakdown in the main circuit connection conductor.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a solid-insulated switchgear using a main circuit connection conductor that can be easily connected and can reduce the depth dimension.

  In order to achieve the above object, the solid insulation switchgear according to the present invention comprises a solid insulation that forms a power system by connecting a switch molded with an insulation material with a main circuit connection conductor molded with the same insulation material. The switch gear, wherein the main circuit connection conductor integrally molds a power supply side conductor connected to the switch and a load side conductor connected to the switch, and the power supply side conductor and the load side A ground plate is embedded with a predetermined insulation distance between the conductors.

  According to the present invention, the power supply side conductor and the load side conductor connected to the switch are integrally molded, and a grounding plate is provided between the conductors, so that insulation can be coordinated and the depth of the box is reduced. can do.

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

  A solid insulation switchgear according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a configuration of a solid insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a configuration of a main circuit connecting conductor used in the solid insulated switchgear according to the embodiment of the present invention. is there. In addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past. Moreover, since the power supply system is the same as the conventional one, the description thereof is omitted.

  As shown in FIG. 1, the solid insulation switchgear is configured by dividing a metal box 1 into a main circuit portion 1a on the back side and an operation mechanism portion 1b on the front side.

  The main circuit portion 1a is provided with a cable head 3 to which a power cable 2 is connected. The cable head 3 is connected to a main circuit connection conductor 30 arranged in the vertical direction of the middle part of the box 1. The main circuit connecting conductor 30 includes a Z-shaped first embedded conductor 31 bent from an intermediate part on the back side to a lower part on the front side, and a second U-shaped conductor disposed in the intermediate part on the front side. The embedded conductor 32 and the L-shaped third embedded conductor 33 disposed on the upper portion are embedded in an insulating layer 34 formed by integrally molding with an epoxy resin. Further, the rated voltage is applied between the first embedded conductor 31 and the second embedded conductor 32 and between the first embedded conductor 31 and the second embedded conductor 32 and the third embedded conductor 33. A grounding plate 35 made of a J-shaped metal plate is embedded so as to maintain a predetermined insulation distance that can be withstood.

  Here, the cable head 3 is connected to the end of the first embedded conductor 31 led out to the intermediate portion on the back side. The end of the first embedded conductor 31 led out to the front side is connected to the fixed side of the power supply side disconnect portion 7 in which the disconnection vacuum valve 6 is molded with epoxy resin. The disconnecting vacuum valve 6 is horizontally arranged in the axial direction, and is arranged at the lowermost part of the box 1.

  On the upper part of the power supply side disconnection part 7, a shutoff part 9 in which a shutoff vacuum valve 8 arranged horizontally in the axial direction is molded with an epoxy resin is arranged apart. A first movable portion 10 is provided on the movable side of the power supply side disconnection portion 7 and the cutoff portion 9, and the movable side of the disconnection vacuum valve 6 and the cutoff vacuum valve 8 is connected by a movable side conductor 11. Insulating operation rods 12 that are movable in the axial direction are connected to the movable sides of the disconnecting vacuum valve 6 and the disconnecting vacuum valve 8, respectively.

  The lower end of the second embedded conductor 32 led out to the front side is connected to the fixed side of the blocking portion 9, and the upper end is connected to the load-side disconnecting portion 15 in which the disconnecting vacuum valve 14 is molded with epoxy resin. Has been. The load-side disconnecting part 15 is arranged horizontally in the axial direction and is arranged on the upper part of the blocking part 9. A bypass portion 17 in which the center conductor 16 is molded with an epoxy resin is disposed above the load-side disconnecting portion 15 so as to be spaced apart.

  A second movable portion 18 is provided on the movable side of the load-side disconnecting portion 15 and one end side of the bypass portion 17, and the movable side of the disconnecting vacuum valve 14 and the end of the central conductor 16 are connected by the movable-side conductor 19. ing. An insulating operation rod 20 that is movable in the axial direction is connected to the movable side of the disconnecting vacuum valve 14.

  One end of a third embedded conductor 33 led to the front side is connected to the other end of the bypass portion 17. The other end of the third embedded conductor 33 led out in the upper direction is connected to a bus 22 that connects between the panels arranged at the top of the box 1.

  The operation mechanism section 1b is provided with operation mechanisms 27 on the lower side and the upper side of the box 1, respectively connected to the insulating operation rods 12 and 20, and the disconnecting vacuum valves 6 and 14 and the shut-off vacuum valve 8 are connected to each other. Opening and closing is performed. A control room 28 monitors voltage and current and operates the operation mechanism 27.

  Here, the main circuit connecting conductor 30 is shown in FIG. As shown in FIG. 2, for example, a conductive paint is applied to the outer periphery of the insulating layer 34 except for the interface connection portion 36 formed in a conical convex portion or concave portion that connects to an adjacent electric device. The grounding layer 37 is provided. Further, the ground plate 35 is fixed to the buried metal 38, and the buried metal 38 and the ground layer 37 are in contact with each other.

  If the ground plate 35 is a metal net, the flow of resin is improved during molding, and workability is improved. Moreover, if semiconductive rubber is used, the stress in the insulating layer 34 is absorbed, and crack resistance can be improved. Further, if a resistor such as a nickel / chromium alloy is used, when a ground fault occurs, resistance grounding is provided, so that damage to peripheral devices such as the power supply side disconnecting portion 7 can be suppressed.

  Next, the insulation coordination of the main circuit connection conductor 30 will be described. For example, when the power supply side disconnecting portion 7 is open, the first embedded conductor 31 is charged on the power supply side, and the second embedded conductor 32 is not charged on the load side. In this state, even if the insulating layer 34 breaks down, it becomes a ground fault from the first embedded conductor 31 to the ground plate 35 and does not cause a short circuit to the second embedded conductor 32 side. Similarly, even when the power supply side disconnecting portion 7 and the shutoff portion 9 are closed and the load side disconnecting portion 15 is open, the charged second embedded conductor 32 to the non-charged third embedded conductor 33 side. Short circuit can be prevented. That is, it is possible to prevent a short circuit between the electrodes and to give priority to the ground fault.

  For these reasons, the ground plate 35 is provided between the poles of the switch such as the power-side disconnecting part 7, the interrupting part 9, and the load-side disconnecting part 15, and the dielectric strength is between the poles> to the ground and the ground fault is given priority. Insulation coordination can be achieved. Further, it can be said that the embedded conductors 31, 32, and 33 are a power supply side conductor and a load side conductor connected to the switch, and the main circuit connection conductor 30 is obtained by integrally molding these conductors.

  In assembly, first, the power supply side disconnecting portion 7, the shutoff portion 9, and the load side disconnecting portion 15 are fixed to the box body 1 with a predetermined interval, and the main circuit connecting conductor 30 is moved in parallel while being moved in parallel. The interface connection part 36 is connected and fixed to the power supply side disconnection part 7, the interruption part 9, and the load side disconnection part 15. Next, the cable head 3 is connected and fixed to the interface connecting portion 36 on the back side while the cable head 3 is moved in parallel. As a result, the main circuits can be connected together and the connection work can be easily performed. In addition, since a plurality of switches such as the power supply side disconnecting section 7, the disconnecting section 9, and the load side disconnecting section 15 can be connected by one main circuit connecting conductor 30, the number of parts is small and the connection work space is minimized. And the size of the box 1 in the depth direction can be reduced.

  According to the solid-insulated switchgear of the above embodiment, the first embedded conductor 31 that connects the cable head 3 and the power supply side disconnect portion 7, and the second embedded conductor that connects the cutoff portion 9 and the load side disconnect portion 14. The main circuit connection in which the conductor 32 and the third embedded conductor 33 connecting the bypass portion 17 and the bus 22 are integrally molded with an insulating material, and the ground plate 35 is embedded between the embedded conductors 31, 32, 33. Since the main circuit is connected using the conductor 30, the number of parts can be reduced, and the size of the depth method of the box 1 can be reduced.

  In the said Example, although demonstrated using the power supply side disconnection part 7, the interruption | blocking part 9, and the load side disconnection part 15 as a switch, depending on a power supply system, a switch may become single or 1 or more. Even in this case, the power supply side conductor connected to the switch and the load side conductor are integrally molded with an insulating material, and the grounding plate is embedded between the power supply side conductor and the load side conductor, so that the connection work is easy and the insulation coordination is achieved. Can be assumed.

The side view which shows the structure of the solid insulation switchgear which concerns on the Example of this invention. Sectional drawing which shows the structure of the main circuit connection conductor used for the solid insulation switchgear which concerns on the Example of this invention. The side view which shows the structure of the conventional solid insulation switchgear. The power system diagram of a solid insulation switchgear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box 1a Main circuit part 1b Operation mechanism part 2 Electric power cable 3 Cable head 4, 5, 13, 21 Connection conductor 6, 8, 14 Vacuum valve 7 Power supply side disconnection part 9 Blocking part 10, 18 Movable part 11, 19 Movable Side conductors 12 and 20 Insulating operation rod 15 Load side disconnecting parts 16 and 23 Center conductor 17 Bypass part 22 Buses 24 and 34 Insulating layers 25 and 37 Grounding layers 26 and 36 Interface connection part 27 Operating mechanism 28 Control room 30 Main circuit connection conductor 31 First buried conductor 32 Second buried conductor 33 Third buried conductor 35 Ground plate 38 Filling

Claims (5)

A solid-insulated switchgear that configures a power system by connecting a switch molded with an insulating material with a main circuit connection conductor molded with a similar insulating material,
The main circuit connection conductor is a power supply side conductor connected to the switch;
While integrally molding the load side conductor connected to the switch,
A solid insulation switchgear, wherein a ground plate is embedded with a predetermined insulation distance between the power supply side conductor and the load side conductor.   2. The solid insulated switchgear according to claim 1, wherein the switch includes at least one of a power supply side disconnection part, a cutoff part, and a load side disconnection part.   The solid insulated switchgear according to claim 1 or 2, wherein the ground plate is a metal net.   The solid insulating switchgear according to claim 1 or 2, wherein the ground plate is made of semiconductive rubber.   3. The solid insulation switchgear according to claim 1, wherein the ground plate is a resistor.

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