JP7040885B2 - Switch - Google Patents

Description

The present invention relates to a switch installed in an electric power system.

In the distribution system, for example, when a high voltage is applied to the distribution line due to a ground fault, an arc is generated between the charging part and the side wall of the case inside the case of the switch provided on the distribution line, resulting in a short-circuit accident. May become. If the arc is concentrated near the side wall of the case or the bushing due to a short-circuit accident of the switch, a hole may be opened in the case, and internal parts may be scattered or dropped from the hole, resulting in a public disaster.

Conventionally, a technique for controlling an arc generation part in a switch has been proposed. For example, in Patent Document 1, as shown in FIG. 6, in an air-insulated three-phase switch 500, it extends to the charging unit conductors 501, 502, 503 of each phase and toward the charging unit conductor side of the adjacent phase. A structure has been proposed in which the electrodes 504,505,506 are provided.

The method described in Patent Document 1 occurs at the time of a short circuit between the facing electrodes of the electrodes 504, 505, 506 extending from the charging unit conductors 501, 502, 503 of each phase to the charging unit conductor side of the adjacent phase. By concentrating the arc F, it is possible to prevent the generation of an arc between the charging unit conductors 501, 502, 503 and the case 507, and prevent the case 507 and the like from being damaged by the arc.

Japanese Patent No. 3013770

The method described in Patent Document 1 is a structure in which three charging unit conductors 501, 502, 503 are arranged side by side in a horizontal row in a case 507 of a switch, and is adjacent to each charging unit conductor 501, 502, 503. Since the electrodes 504,505 and 506 extending to the conductor of the charging unit are attached, the distance D between the conductors of the charging unit is set in order to satisfy the withstand voltage performance between the conductors of the charging unit and to have a ground fault priority structure. It needs to be large. Therefore, there is a problem that the length L of the charging unit conductors 501, 502, 503 in the case 507 in the arrangement direction becomes long, and the switch 500 becomes large.

The present invention has been made in view of the above problems, and a switch capable of effectively preventing the generation of an arc between the conductor of the charging unit and the case without inviting an increase in size of the switch. The purpose is to provide.

The switch according to the present invention opens and closes by accommodating one or more line opening / closing circuits having two charging portions arranged opposite to each other and a connecting portion for connecting both charging portions so as to be openable / closable. The switch is characterized in that a barrier member made of an insulating material having a property that at least the surface facing the line switching circuit is carbonized by heating is provided between the line switching circuit and the side wall of the container. ..

According to the switch according to the present invention, the arc generated in the container due to the short circuit accident of the switch is concentrated between the charging parts with the adjacent phase via the barrier member, and the container is prevented from being damaged by the heat of the arc. can do. Further, since the plate-shaped barrier member is arranged in the gap between the line opening / closing circuit and the side wall of the container, the size of the container is not increased.

In the above switch, the barrier member may be made of a polyester glass mat material.

According to the above configuration, the surface of the barrier member is carbonized by the heat and hot air of the arc generated between the charging portion and the barrier member, and the insulation resistance thereof is lowered, and the arc is in an adjacent phase along the surface of the barrier member. Since it is short-circuited with the charging portion of the container, it is possible to suitably prevent the arc from concentrating on the inner wall of the container.

Further, in the above switch, the barrier member may have a film or layer having a property of being carbonized by heating formed on a surface of a plate member having an insulating property facing the line opening / closing circuit.

According to the above configuration, since the barrier member having a film or layer having a property of being carbonized by heating is used only on the surface of the insulating plate member, the cost of the barrier member can be reduced.

Further, in the above switch, three line opening / closing circuits are housed in a row in a container, and the barrier member is provided so that the three line opening / closing circuits are shielded from the side wall of the container. It is good to have.

According to the above configuration, the three line opening / closing circuits housed in the container are shielded from the side wall of the container by the barrier member, so that an arc is surely prevented from being generated between the charging part and the side wall of the container. can do.

Further, in the above switch, it is preferable that an insulating plate is provided between adjacent circuits of the three line switching circuits.

According to the above configuration, since the insulating plate is also arranged between the adjacent circuits of the three line switching circuits, the arc generated in the container is concentrated between the charging part and the barrier member. Can be done.

According to the switch according to the present invention, the arc generated in the container due to the short circuit accident of the switch is concentrated between the charging parts with the adjacent phase via the barrier member, and the container is prevented from being damaged by the heat of the arc. can do. Further, since the plate-shaped barrier member is arranged in the gap between the line opening / closing circuit and the side wall of the container, the size of the container is not increased.

It is a figure which shows an example of the internal structure of the switch which concerns on this invention, and is the figure which looked at the inside of a container in the direction of the longitudinal container side wall. It is a figure which shows the internal structure of the switch, and is the figure which looked at the direction of the bottom side inside a container. It is a figure which shows the internal structure of the switch, and is the figure which looked at the inside of a container in the direction of the side wall of a short container. A perspective view showing the structure of the barrier member used in the switch. Image of when an arc is generated in the container due to a short circuit accident of the switch. The figure which shows the internal structure of the conventional switch

Hereinafter, embodiments of the switch according to the present invention will be described with reference to the drawings. In the following description, an example of a three-phase switch arranged on a three-phase distribution line will be described. In the embodiment, the components with the same reference numerals perform the same operation, and thus the description thereof may be omitted again.

(Embodiment 1)
1 to 3 are views showing an example of the internal structure of the switch 1 according to the present invention. In FIGS. 1 to 3, the outer shape of the container of the switch 1 is simplified to the shape of a horizontally long rectangular parallelepiped, and the basic line opening / closing circuit housed in the container and its structure are also simplified and described. FIG. 1 is a view of the inside of the container in the direction of the longitudinal side wall of the container, and FIG. 2 is a view of the inside of the container in the direction of the bottom surface side. Further, FIG. 3 is a view of the inside of the container of the switch 1 as viewed in the direction of the short side wall of the container.

Note that, in FIG. 1, for convenience of drawing, members such as the connection portion 123 described later are omitted, and in FIG. 2, for convenience of drawing, the barrier member 13 described later is omitted.

The switch 1 has a configuration in which three line switching circuits 12 are housed in the container 11. The container 11 has a horizontally long rectangular parallelepiped main body 111 having an open upper surface, a lid 112 that closes the opening surface of the main body 111, and an airtight packing 113 for sealing the lid 112 to the main body 111. The main body 111 is provided with a step in the opening, and the opening end is recessed inward. The airtight packing 113 is loaded all around the recessed portion of the open end. An elastic member such as rubber is used for the airtight packing 113. As the airtight packing 113, any material can be used as long as it has airtightness.

The three line switching circuits 12 have the same components, and are configured as a connection unit 123 that connects two charging units 121 and 122 and both charging units 121 and 122, which are arranged so as to face each other, so as to be openable and closable. Has an element.

The charging unit 121 is a member for drawing a distribution line to which a substation is connected (hereinafter referred to as a “power supply side line”) into the container 11, and the charging unit 122 is connected to a load (customer). This is a member for drawing the distribution line (hereinafter referred to as "load side line") into the container 11. The charging unit 121 (hereinafter referred to as “power supply side charging unit 121”) is attached to a cylindrical bushing 124A for insulating from the container 11 so as to penetrate in the axial direction, and is a container along the longitudinal direction of the main body 111. It is attached to the side wall 111A via the bushing 124A. Further, the charging unit 122 (hereinafter referred to as “load-side charging unit 122”) is attached to the bushing 124B so as to penetrate in the axial direction, and is a container side wall 111B facing the container side wall 111A of the main body 111, and is a power source. It is attached to a position facing the side charging unit 121 via a bushing 124B.

The power supply side charging unit 121 and the load side charging unit 122 are a conductor 125A (hereinafter referred to as a power supply side charging unit conductor 125A) protruding from the tip of the bushing 124A of the power supply side charging unit 121 and a bushing of the load side charging unit 122. Conductors 125B (hereinafter referred to as load-side charging unit conductors 125B) protruding from the tip of 124B are attached to the container 11 so as to face each other with a predetermined interval. Each power supply side charging unit 121 of the three line switching circuits 12 is attached to the container side wall 111A of the main body 111 in a row in the longitudinal direction, and each load side charging unit 122 of the three line switching circuits 12 is attached. They are attached to the container side wall 111B of the main body 111 side by side in a row in the longitudinal direction.

A connection portion 123 is attached between the power supply side conductor 125A and the load side conductor 125B of each line switching circuit 12. The structures of the three connecting portions 123 attached to the three line switching circuits 12 are the same as described below.

The connecting portion 123 includes an L-shaped movable electrode 1231 having a bent tip portion at a right angle, a fixed electrode 1232 having a receiving portion for engaging the tip portion (engaging portion) 1231a of the movable electrode 1231, and a movable electrode. It has an opening / closing mechanism 1233 that rotates 1231 to connect / disconnect the fixed electrode 1232 (open / close the line between the power supply side line and the load side line).

The base end of the movable electrode 1231 is rotatably attached to the power supply side charging unit conductor 125A. The fixed electrode 1232 is fixed to the load-side charging portion conductor 125B with the receiving portion facing upward. The opening / closing mechanism 1233 has two links 1233A and 1233B rotatably connected to each other, and the base end portion of one of the links 1233A rotates on a rotation shaft 126 arranged in the main body 111 in parallel with the longitudinal direction. It is installed as possible. The tip of the other link 1233B is rotatably attached to the intermediate portion of the movable electrode 1231.

A drive mechanism 127 for integrally driving the three opening / closing mechanisms 1233 is provided on the side of the container side wall 111C along the lateral direction in the main body 111. The drive mechanism 127 is a mechanism that transmits the driving force to the three opening / closing mechanisms 1233. The driving force includes a driving force manually operated by an operator and a driving force generated by remote control. The drive mechanism 127 is provided, for example, for the operator to manually open and close the switch 1 provided on the outside of the container side wall 111C so that the operator can manually open and close the switch 1. A mechanism for transmitting the rotational movement of the lever 128 to the three opening / closing mechanisms 1233 is provided. The lever 128 is a lever that rotates between a predetermined "open position" and "closed position".

Although not shown, in the drive mechanism 127, when the operator rotates the lever 128 clockwise to the “closed” position, the link 1233A responds to the rotation to the rotation shaft in FIG. It rotates counterclockwise around 126. The counterclockwise rotation of the link 1233A causes the link 1233B to push down the movable electrode 1231, and the movable electrode 1231 rotates counterclockwise around the connection point of the power supply side charging unit conductor 125A to engage the movable electrode 1231a. Is engaged with the receiving portion of the fixed electrode 1232 (closed state of the switch 1) (state shown by the solid line in FIG. 3).

Further, when the operator rotates the lever 128 counterclockwise to the "open" position, the link 1233A rotates clockwise around the rotation shaft 126 in FIG. 3 in response to the rotation. The clockwise rotation of the link 1233A causes the link 1233B to push up the movable electrode 1231, and the movable electrode 1231 rotates clockwise around the connection point of the power supply side charging unit conductor 125A to fix the engaging portion 1231a of the movable electrode 1231. It is in a state of being separated from the receiving portion of the electrode 1232 (the open state of the switch 1) (the state shown by the dotted line in FIG. 3).

Inside the container 11, a flat plate barrier member 13 is attached to the gap between the three line opening / closing circuits 12 and the lid 112. The barrier member 13 is made of an insulating material and is carbonized by heating on a surface facing at least three line switching circuits 12 (hereinafter, this surface is referred to as a "back surface" and a surface facing the lid 112 is referred to as a "front surface"). It is composed of a plate member having the characteristics of carbonizing. In the container 11 in which the lid 112 is fixed so as to seal the open end of the main body 111, the bottom surface of the lid 112 and the main body 111 also constitutes the side wall of the container 11, and the three line opening / closing circuits 12 Is surrounded by six side walls (ground planes) on the top, bottom, left, and right.

The barrier member 13 may be made of a single resin plate, or may be made of an insulating plate having a resin film or a resin layer formed on the back surface thereof, which is carbonized by heating. As a material having a property of carbonizing by heating, for example, a polyester glass mat material can be used. Therefore, the barrier member 13 is made of a polyester glass mat plate having a predetermined thickness. As shown in FIG. 4, the barrier member 13 is made of a plate material in which a resin film 132 or a resin layer 132 of a polyester glass mat is formed on the back surface of a resin plate 131 having a predetermined thickness different from that of polyester glass. May be good.

Four support portions 129 (see FIG. 3) for supporting the barrier member 13 are attached so as to project inward at predetermined positions of the two container side walls 111A and 111B of the container 11. The barrier member 13 is attached to the container 11 by fixing both ends facing the container side wall 111A and the container side wall 111B to the four support portions 129 by, for example, bolting.

Next, the operation and effect of the barrier member 13 provided in the switch 1 according to the present invention will be described.

FIG. 5 is an image diagram when an arc is generated in the container 11 due to a short-circuit accident of the switch 1.

When the switch 1 is operating normally, the barrier member 13 provided between the three line switching circuits 12 and the lid 112 functions as an insulating material, so that the three line switching circuits 12 and the lid The insulating effect with the body 112 is improved as compared with the case without the barrier member 13.

When a short-circuit accident occurs in the switch 1, usually, the high-voltage portion of the power supply side charging section conductor 125A, the load side charging section conductor 125B and the connecting section 122, and the container side walls 111A and 111B of the container 11 and the low-voltage portion of the lid 112 (grounding). An arc is generated between the part) and. Due to the generation of this arc, the temperature inside the container 11 becomes high, the back surface of the barrier member 13 is carbonized, and the insulation resistance of the back surface thereof decreases. As a result, as shown in FIG. 5, the arc F is concentrated between the three power supply side charging unit conductors 125A, the movable electrode 1231 and the load side charging unit conductor 125B, and the back surface of the barrier member 13.

By concentrating the arc F between the three power supply side charging unit conductors 125A and the back surface of the barrier member 13, it is possible to prevent the arc F from directly discharging to the container side walls 111A and 111B and the lid 112 of the container 11. be able to. Therefore, it is possible to prevent damage such as opening of holes due to the discharge of the arc F to the container side walls 111A and 111B and the lid 112 of the container 11.

The switch 1 according to the present embodiment does not have a configuration in which the conductor for arc discharge is projected from the three power supply side charging unit conductors 125A toward the adjacent power supply side charging unit conductors 125A as in the prior art. Since only the plate-shaped barrier member 13 is arranged in the gap between the three power supply side charging unit conductors 125A, the three load side charging unit conductors 125B, and the three connecting units 123 and the lid 112, the switch is a switch. It does not affect the external dimensions of 1 (see length L in FIG. 5 and width W in FIG. 2).

That is, damage due to the arc F can be effectively prevented without increasing the size of the existing switch 1. On the contrary, the size of the switch 1 is made the same as that of the existing switch, and the arrangement spacing D (see the spacing D in FIG. 5) of the three sets of charging portions 121 and 122 arranged opposite to each other in the container 11 is widened. As a result, the insulation effect between the adjacent sets of charging units 121 and 122 can be improved as compared with the conventional case, and the reliability with respect to the surge voltage can be improved.

Further, since the arc F does not occur between the surface of the barrier member 13 and the lid 112 and the container side walls 111A and 111B (see the space SA in FIG. 5), the temperature rise of the container 11 is suppressed, for example, the container. It is possible to prevent the airtight packing 113 provided at the open end of 11 from burning out.

In the above embodiment, the flat plate barrier member 13 is arranged between the three line opening / closing circuits 12 and the lid 112 in the container 11, but the three line opening / closing circuits 12 and the container 11 are arranged. A flat plate barrier member 13 may be arranged between the bottom surface and the bottom surface, or an insulating member may be added between the adjacent line switching circuits 12 of the three line switching circuits 12.

Further, the barrier member 13 may be arranged so as to shield the three line opening / closing circuits 12 from the container side walls 111A, 111B, 111C and the drive mechanism 127 of the container 11, and the barrier member 13 for the arrangement is sufficient. The number, shape, arrangement position of 13 and the mounting structure in the container 11 are not limited.

In the above embodiment, a three-phase switch has been described as an example, but it goes without saying that the present invention can be applied to a single-phase switch.

1 Switch 11 Container 111 Main body 111A, 111B, 111C Container side wall 112 Lid 113 Airtight packing 12, 12U, 12V, 12W Line opening / closing circuit 121 Power supply side charging unit 122 Load side charging unit 123 Connection unit 1231 Movable electrode 1231a Engagement unit 1232 Fixed electrode 1233 Opening / closing mechanism 1233A, 1233B Link 124A, 124B Bushing 125A Power supply side charging part conductor 125B Load side charging part conductor 126 Rotating shaft 127 Drive mechanism 128 Lever 129 Supporting part 13 Barrier member

Claims (5)

In a switch that houses one or more line opening / closing circuits having two charging portions arranged opposite to each other and a connecting portion that connects both charging portions so as to be openable / closable.
At least the line opening / closing circuit between the line opening / closing circuit and the lid, bottom surface of the container, the side wall to which the charging part on the power supply side is attached, or the side wall to which the charging part on the load side is attached. A flat plate barrier member made of an insulating material having the property that the surface facing the surface is carbonized by heating is provided .
Both ends of the barrier member are supported by support portions provided in the container.
A switch characterized by that. The switch according to claim 1, wherein the barrier member is made of a polyester glass mat material. The switch according to claim 1, wherein the barrier member is a plate member having an insulating property having a film or layer having a property of being carbonized by heating formed on a surface facing the line opening / closing circuit. Three line opening / closing circuits are housed in a row in the container.
The barrier member is provided so that the three line opening / closing circuits are shielded from the side wall of the container.
The switch according to any one of claims 1 to 3. An insulating plate is provided between adjacent circuits of the three line switching circuits.
The switch according to claim 4.

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