JP2009044927A - Metal-enclosed switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the installation area of a metal-enclosed switchgear with multi-circuit structure, using a solid insulator. <P>SOLUTION: The metal-enclosed switchgear is equipped with a box 1; a main circuit switch comprising disconnectors 4a, 4b and breakers 7a, 7b disposed inside the box 1 with their axial directions, disposed in parallel, molded by an insulating material, and stacked in multistage; a bus line 17 connecting the main circuit terminal of the main circuit switch via branched conductors 17a, 17b; and operation mechanisms 11a, 11b connected in the axial direction of the main circuit switch. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a metal closed switchgear in which a main circuit switching device is molded with an insulating material such as an epoxy resin.

  In a general metal closed type switchgear, a main circuit switching device such as a circuit breaker or a disconnecting switch is configured by air insulation (see, for example, Patent Document 1). However, the insulation performance is easily affected by the surrounding environment, and there is a limit to downsizing, and a gas insulation is known (for example, see Patent Document 2). Although gas insulation can be significantly reduced, strict management must be performed so that the insulating gas does not leak.

  In view of this, there is known one that employs solid insulation that can be reduced to the same degree or more as gas insulation (see, for example, Patent Document 3). In this method, a main circuit switching device is molded with an insulating material such as an epoxy resin to constitute a power supply system.

  This type of metal closed switchgear is shown in FIG. 3, and a disconnecting portion 4 in which a first insulating layer 3 is formed by molding a disconnecting vacuum valve 2 with an insulating material in the center of the box 1. Are provided in the vertical direction in the vertical direction in the figure. Further, a blocking portion 7 in which the blocking vacuum valve 5 is molded with an insulating material to form the second insulating layer 6 is also provided in a vertical direction in the vertical direction of the drawing and arranged in parallel. The movable sides of the disconnecting part 4 and the blocking part 7 are connected by a connection conductor 9 covered with a third insulating layer 8.

  Insulating operation rods 10 are respectively connected to the movable sides of the disconnecting section 4 and the blocking section 7, and an opening / closing operation is performed by an operating mechanism 11 provided on the floor side of the box 1. In addition, a ground switch 13 having a bar-like contact 12 having a ground potential that moves in the vertical direction in the figure and contacts and separates from the connection conductor 9 is provided.

  On the back side of the box 1, a cable head 16 that connects the power cable 15 that penetrates the current transformer 14 is provided, and is connected to the main circuit end of the blocking portion 7. In addition, a bus 17 for connecting to the adjacent board is connected to the main circuit end of the disconnecting portion 4. A control chamber 18 for controlling main circuit switching devices such as the disconnecting section 4 and the blocking section 7 is provided on the front side of the box 1. A grounding layer is provided on the outer peripheral surface of the first insulating layer 3, the second insulating layer 6, the third insulating layer 8, the cable head 16 molded with an insulating material, the insulating layer of the bus bar 17, and the like. ing.

By such a metal closed type switchgear, as shown in a one-dot chain line in FIG. 4, a disconnection part (DS) branched from the busbar (BUS), a cutoff part (CB), a ground switch (ES), a cable head (CH), a one-circuit power supply system including a current transformer (CT) is configured. When a two-circuit power supply system is configured, the same circuit configuration is connected in parallel to the bus (BUS). In the metal closed type switchgear shown in FIG. 3, a two-circuit power supply system can be configured by arranging two boxes 1 in a row.
Japanese Patent Laid-Open No. 11-205921 (pages 4-5, FIG. 6) Japanese Patent Laid-Open No. 9-117024 (page 3, FIG. 1) JP 2003-333715 A (5th page, FIG. 1)

  The conventional metal closed switchgear described above has the following problems. In the metal closed type switchgear using the solid insulation that can be reduced to the same level or more as the gas insulation, the effect of the reduction is greatly produced in the power supply system of one circuit. The board had to be arranged, and the width direction of the board was large. This type of metal closed type switchgear often constitutes a multi-circuit of two or more circuits, and as a result, the installation area is large despite the use of solid insulation.

  The present invention has been made to solve the above problem, and provides a metal closed switchgear using solid insulation that can reduce the installation area even in the configuration of a multi-circuit power supply system. Objective.

  In order to achieve the above object, a metal closed switchgear according to the present invention is a main body which is housed in a box, and is axially arranged horizontally in the box, molded with an insulating material, and stacked in multiple stages. It is characterized by comprising a circuit switching device, a bus bar connecting the main circuit ends of the main circuit switching device, and an operating mechanism coupled in the axial direction of the main circuit switching device.

  According to the present invention, since the main circuit switching devices molded with an insulating material are horizontally arranged and stacked in multiple stages, it is possible to reduce the installation area when the power supply systems of multiple circuits are arranged in a row.

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

  First, a metal closed switchgear according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view illustrating a configuration of a metal closed switchgear according to a first embodiment of the present invention. In FIG. 1, the same components as those in the prior art are denoted by the same reference numerals. Moreover, since the structure of the power supply system of main circuit switching devices, such as a circuit breaker and a disconnecting switch, is the same as that of FIG. 4, the description is abbreviate | omitted.

  As shown in FIG. 1, the inside of the box 1 is divided into a first unit 1a in the upper part of the figure and a second unit 1b in the lower part of the figure.

  In the first unit 1a, the axial direction of the disconnecting portion 4a in which the outer periphery of the disconnecting vacuum valve 2a is molded with an insulating material to form the first insulating layer 3a is provided in the horizontal direction of the horizontal direction in the figure. . Further, the blocking portion 7a in which the outer periphery of the blocking vacuum valve 5a is molded with an insulating material to form the second insulating layer 6a is also provided in parallel with the axial direction provided in the horizontal direction in the horizontal direction in the figure. The movable sides of the disconnecting part 4a and the blocking part 7a are connected by a connection conductor 9a covered with a third insulating layer 8a.

  Insulating operation rods 10a are respectively connected to the movable sides of the disconnecting portion 4a and the blocking portion 7a, and an opening / closing operation is performed by an operation mechanism 11a provided on the front side of the box 1. Further, a ground switch 13a having a bar-like contact 12a having a ground potential that moves in the axial direction in the horizontal direction and contacts and separates from the connection conductor 9a is provided.

  On the back side of the box 1, a cable head 16a for connecting the power cable 15a penetrating the current transformer 14a is provided and connected to the main circuit end of the blocking portion 7a. Further, on the ceiling side, a bus bar 17 for connection to an adjacent board is provided, and a first branch conductor 17a branched from the bus bar 17 is connected to the main circuit end of the disconnecting portion 4a. The cable head 16a, the bus bar 17, and the first branch conductor 17a are molded with an insulating material.

  For example, a ground layer in which a carbon paint is applied to the outer peripheral surfaces such as the first insulating layer 3a, the second insulating layer 6a, the third insulating layer 8a, the insulating layer of the bus bar 17 and the first branch conductor 17a. Is provided.

  The second unit 1b is provided with a main circuit switching device similar to that of the first unit 1a. That is, the disconnecting portion 4b in which the vacuum valve 2b is covered with the first insulating layer 3b and the blocking portion 7a in which the vacuum valve 5b is covered with the second insulating layer 6b are provided in the horizontal direction and arranged in parallel. The movable side of the disconnecting portion 4b and the blocking portion 7b is connected by a connecting conductor 9b covered with a third insulating layer 8b, and an opening / closing operation is performed by an operating mechanism 11b connected to an insulating operating rod 10b. ing. Further, a ground switch 13b having a contact 12b is provided.

  A cable head 16b for connecting a power cable 15b penetrating the current transformer 14b is provided on the back side of the box 1 and connected to the main circuit end of the blocking portion 7b. Connected to the ceiling side is a second branch conductor 17b branched from the bus bar 17 connected to the adjacent board. A control room 18 for controlling main circuit switching devices such as the disconnecting portions 4a and 4b and the blocking portions 7a and 7b is provided on the front side of the box 1.

  Thereby, the main circuit switching device in the 1st unit 1a and the main circuit switching device in the 2nd unit 1b are each connected to the bus-bar 17, and a two-circuit power supply system can be comprised. That is, in the box 1, solid-insulated main circuit opening / closing devices constituting the power supply system are stacked in two stages in a horizontal arrangement, and the opening / closing operation is performed in the horizontal direction. For this reason, two circuits can be comprised with the installation area of the box 1 which comprises one circuit, and the installation area when putting in a line in the case of comprising multiple circuits more than two circuits can be reduced. . Note that the installation area can be further reduced by multi-stacking three or more circuits.

  Further, the disconnecting portion 4a (4b), the blocking portion 7a (7b) in the unit 1a (1b), the operation mechanism 11a (11b) for opening / closing these, and the ground switch 13a (13b) are integrally configured. If the circuit components are unitized and stacked in stages in the box 1 and connected to the bus bar 17, assembly is facilitated. In this case, the unitized parts are assembled in advance outside the box 1 and the opening / closing operation is adjusted.

  For example, if a ceramic capacitor of a voltage detection element is embedded in the third insulating layers 8a and 8b, one terminal is connected to the connection conductors 9a and 9b, and the voltage detection device is connected to the other terminal, the main circuit Can be detected.

  Further, the disconnecting portions 4a, 4b and the blocking portions 7a, 7b may be replaced with solid insulation transformers, lightning arresters and the like molded with an insulating material. Further, for example, the disconnecting portions 4a and 4b may be replaced with a solid-insulated short-circuit conductor to form a circuit having only the blocking portions 7a and 7b. The transformer, the lightning arrester, the short-circuit conductor, and the like have the same outer shape as the disconnecting portions 4a and 4b. Thereby, the power supply system corresponding to various circuit configurations can be configured.

  According to the metal closed type switchgear of the first embodiment, a main circuit switching device such as the disconnecting portions 4a and 4b and the blocking portions 7a and 7b is molded with an insulating material to constitute a one-circuit power supply system made of solid insulation. Since these are arranged in a multistage stack in a horizontal arrangement, the installation area of the box 1 at the time of lining up can be reduced in the power supply system constituting the multicircuit.

  Next, a metal closed switchgear according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a configuration of a metal closed switchgear according to Embodiment 2 of the present invention. The second embodiment differs from the first embodiment in the position of the bus. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 2, a bus bar 17 is arranged on the floor side of the box 1 that becomes a dead space, and is connected to the disconnecting portions 4a and 4b by branch conductors 17a and 17b. The bus bar 17 may be disposed on the back side of the cable heads 16a and 16b.

  According to the metal closed switchgear of the second embodiment, in addition to the effects of the first embodiment, the height of the box 1 can be reduced.

Sectional drawing which shows the structure of the metal closed type switchgear which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the metal closed type switchgear which concerns on Example 2 of this invention. Sectional drawing which shows the structure of the metal closed type switchgear using the conventional solid insulation. The power supply system diagram comprised with a metal closed type switchgear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box 1a 1st unit 1b 2nd unit 2, 2a, 2b, 5, 5a, 5b Vacuum valve 3, 3a, 3b 1st insulating layer 4, 4a, 4b Disconnection part 6, 6a, 6b 2nd Insulating layers 7, 7a, 7b Blocking portions 8, 8a, 8b Third insulating layers 9, 9a, 9b Connection conductors 10, 10a, 10b Insulating operating rods 11, 11a, 11b Operating mechanisms 12, 12a, 12b Contactors 13 , 13a, 13b Ground switches 14, 14a, 14b Current transformers 15, 15a, 15b Power cables 16, 16a, 16b Cable head 17 Bus 17a First branch conductor 17b Second branch conductor 18 Control room

Claims (6)

Box and
A main circuit opening and closing device that is stored in the box in a horizontal arrangement in the axial direction, molded with an insulating material, and stacked in multiple stages,
A bus for connecting a main circuit end of the main circuit switching device;
A metal-closed switchgear comprising an operation mechanism coupled in the axial direction of the main circuit switching device.   2. The metal closed switchgear according to claim 1, wherein the main circuit switching device and the operation mechanism are integrally formed as a unit and stacked in a multistage manner in the box.   3. The metal closed switchgear according to claim 1, wherein the main circuit switching device includes a disconnecting portion and a blocking portion in which an insulating material is molded on an outer periphery of a vacuum valve.   4. The metal closed switch according to claim 1, wherein a grounding switch in which a contact is connected to and separated from a connecting conductor connecting the disconnecting portion and the interrupting portion is provided. 5. gear.   The metal closed switchgear according to any one of claims 1 to 4, wherein the bus bar is disposed on a ceiling side of the box.   6. The metal closed switchgear according to claim 1, wherein a voltage detection element is embedded in an insulating layer of the main circuit switching device.

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