JP7466775B2 - Electrical equipment drawer and switchgear - Google Patents

Description

This application relates to a pull-out device and switchgear for electrical equipment.

The high-voltage compartments of metal-enclosed switchgear consist of a circuit breaker compartment, a busbar compartment, a connection compartment, etc., and each compartment is provided with a partition plate to separate it from the other compartments. Electrical equipment such as circuit breakers, instrument transformers, lightning arresters, and zero-phase voltage detection capacitors may be designed to be removable for maintenance and inspection. When inspecting a compartment containing removable electrical equipment, the electrical equipment is pulled out of the switchgear using an electrical equipment pull-out device, and the inspection is carried out. Compartments that store removable electrical equipment are classified as high-voltage compartments, and metal partition plates are provided to prevent workers from getting electric shocks during inspection, preventing them from touching high-voltage live parts during inspection.

In the prior art, as shown in Patent Document 1, for example, a bushing that constitutes a connection port for a retractable electric device is attached to a partition plate inside a metal-enclosed switchgear. A shielding plate is arranged in front of the bushing to prevent electric shock during inspection, and the shielding plate moves in conjunction with the position of the electric device to ensure the voltage resistance performance of the retractable electric device in the connection position. A mechanism is arranged on the shielding plate for driving in conjunction with the retracted position of the electric device.

JP 2009-17628 A

However, in Patent Document 1, a mechanism for driving the shielding plate in conjunction with the pull-out position of the electrical equipment is arranged on the shielding plate, which makes the shielding plate a large component and requires a large operating force to drive it. In addition, because the shielding plate is a large component, measures are required to drive it smoothly and prevent it from falling over. For this reason, a pair of guide rails are provided on the ceiling panel and floor panel of the metal-enclosed switchgear, and four rollers are provided at the four corners of both the upper and lower ends to facilitate smooth movement. Thus, there was an issue of an increase in the number of components required to drive the shielding plate, which is a large component, smoothly.

This application has been made to solve the above problems. It is an object of the present invention to provide an electrical equipment pull-out device that can move a shielding plate for preventing electric shock with a simple structure and protects workers from touching high-voltage charging parts when the electrical equipment is pulled out for inspection.

The electric equipment pull-out device related to the present application is an electric equipment pull-out device for inserting and removing electric equipment from a connection port of a high-voltage section of a switchgear, and comprises a shielding plate that is provided between the high-voltage section and the electric equipment and has an opening corresponding to the connection port and is electrically grounded, a pair of side plates that support the shielding plate from both sides, a pair of rails that support the side plates and move the shielding plate together with the electric equipment in the inserting and removing direction, and a slide mechanism that moves the side plates so that the shielding plate covers the area around the connection port of the high-voltage section when the electric equipment is in the pulled-out position, and so that the shielding plate is stored between the electric equipment and the high-voltage section when the electric equipment is in the inserted position .

According to the present application, by providing side plates that support the electrically grounded shielding plate from both sides, and a pair of rails that support the side plates and move the shielding plate together with the side plates in the direction in which the electrical equipment is inserted or removed, it is possible to obtain an electrical equipment pull-out device that can move the shielding plate to prevent electric shock with a simple structure and that can protect workers from coming into contact with high-voltage charging parts when the electrical equipment is pulled out for inspection.

1 is a cross-sectional view showing a side of an electric device pull-out device according to a first embodiment, showing a state in which the electric device is pulled out. 1 is a cross-sectional view showing the front of an electric device pull-out device according to a first embodiment, illustrating a state in which the electric device is pulled out. 1 is a cross-sectional view showing a side of an electric device drawing device according to a first embodiment, showing a state in which an electric device is inserted; 1 is a cross-sectional view showing the front of an electric device drawing device according to a first embodiment, showing a state in which an electric device is inserted. FIG.

Embodiment 1.
1 to 4 are diagrams showing the structure of the electric device pull-out device according to the first embodiment. FIG. 1 and FIG. 2 show the pull-out device in a state where the electric device is pulled out. FIG. 1 is a cross-sectional view showing the side of the electric device pull-out device. FIG. 2 is a front view of FIG. 1. FIG. 1 shows the cross section AA in FIG. 2, and FIG. 2 shows the cross section BB in FIG. 1. In FIG. 1 and FIG. 2, the drawn-out electric device is omitted. In FIG. 3 and FIG. 4, the electric device pull-out device shows the state where the electric device is inserted into the metal-enclosed switch gear. FIG. 3 is a cross-sectional view showing the side of the electric device pull-out device. FIG. 4 is a front view of FIG. 3. In FIG. 3, the cross section CC in FIG. 4 is shown, and FIG. 4 shows the cross section DD in FIG. 3. In FIG. 3, the inserted electric device is shown by a dashed line, and in FIG. 4, the electric device is omitted.

1 and 2 show the structure of a compartment 10 in which a withdrawal device for withdrawable electric equipment of a metal-enclosed switchgear 1 is arranged. The compartment 10 in which the withdrawable electric equipment 3 is arranged is separated from the high-voltage section 20 by a partition plate 11, which is a grounded metal. Furthermore, it is composed of a floor plate 12 and a ceiling plate 13, which are also grounded metals, and a pair of rails 7 that guide the operation of taking in and out (inserting and withdrawing) the withdrawable electric equipment 3. Here, the electric equipment 3 is, for example, a circuit breaker, a disconnecting switch, a current transformer, or an instrument transformer. When the electric equipment 3 is inserted, the connection part of the electric equipment 3 is connected to the high-voltage charging part 2b via the connection port 2a of the high-voltage part 20, and when it is withdrawn, the connection part of the electric equipment 3 is disconnected from the high-voltage charging part 2b.

The pull-out device for the electric equipment 3 is composed of a pair of side plates 4 arranged inside rails 7 that guide the insertion and removal of the electric equipment 3, a shielding plate 5 provided between the side plates 4, and a device that drives these. The side plate 4, which has a side plate bottom 4a and a side plate support 4b, is L-shaped when viewed from the side, and the side of the side plate bottom 4a extending in the insertion/removal direction is guided by the rails 7, allowing it to move in the insertion/removal direction of the electric equipment 3. Here, an example is shown in which the rails 7 that support the side plate bottom 4a and the rails 7 that insert and remove the electric equipment 3 are shared, but they may be provided separately.

A shielding plate 5 is fixed between a pair of side plate support parts 4b erected from the side plate bottom part 4a. The shielding plate 5 may be one or more, and the number of plates is not important. The shielding plate 5 is arranged to have an opening 5a corresponding to the connection port 2a of the bushing 2. The side plate support part 4b of the side plate 4 is provided with an opening/closing plate guide rail 6 that guides the operation of opening/closing plates 61a, 61b that open and close the opening 5a of the shielding plate 5 in conjunction with the position of the electric device 3. In addition, the side plate 4 is provided with opening/closing plate links 14a, 14b for driving the opening/closing plates 61a, 61b, and these opening/closing plate links 14a, 14b are connected to a connecting link 17 that connects the pair of side plates 4. These opening/closing plate links 14a, 14b and the connecting link 17 constitute an opening/closing mechanism for driving the opening/closing plates 61a, 61b.
2, the side plate support portion 4b of the side plate 4 has a frame portion 4c on the partition plate 11 side, and the shielding plates 5 are provided between the pair of frame portions 4c at a predetermined distance from each other. Also, opening/closing plates 61a, 61b are attached movably along opening/closing plate guide rails 6 provided on the side plate support portion 4b so as to cover the opening portion 5a without the shielding plate 5.

When the electric device 3 is pulled out as shown in Figs. 1 and 2, the opening/closing plates 61a and 61b are in a position to cover the opening 5a of the shielding plate 5, and when the electric device 3 is inserted as shown in Figs. 3 and 4, the opening/closing plates 61a and 61b move to a position overlapping the shielding plate 5. In addition, a slide link 9 that moves the side plate 4 horizontally along the rail 7 in conjunction with the position of the electric device 3 is disposed at the bottom of the side plate support portion 4b. A return spring 15 is provided between the slide link 9, which moves the side plate 4 according to the pull-out position of the electric device 3, and the partition plate 11. As shown in Fig. 1, the return spring 15 moves the side plate 4 to a return position so that the shielding plate 5 and the opening/closing plates 61a and 61b provided on the side plate 4 cover the periphery of the connection port 2a with the high voltage unit 20 when the electric device 3 is pulled out. The return spring 15 and the slide link 9 form a slide mechanism that moves the side plate 4 in the direction in which the electric device 3 is inserted or removed.

When the electric equipment 3 is pulled out as shown in Figures 1 and 2, the connection port 2a of the bushing 2 is covered by the shielding plate 5, which is a grounded metal, and the opening and closing plates 61a and 61b, preventing electric shock to the worker. When the electric equipment 3 is inserted as shown in Figure 3, the opening and closing plate links 14a and 14b operate in conjunction with the insertion position of the electric equipment 3. The electric equipment 3 is mounted on a dolly 3a that can move in the pull-out direction, and moves together with the dolly 3a in the insertion direction of the connection port 2a. The operation sequence during insertion is as follows: first, the pull-out mechanism provided on the electric equipment 3 or the dolly 3a engages with the connecting link 17 and the opening and closing mechanism of the opening and closing plate links 14a and 14b, causing the opening and closing plates 61a and 61b to move up and down, and the opening 5a corresponding to the connection port 2a of the bushing 2 opens. As the insertion operation continues, the slide link 9, which moves the side plate 4 horizontally according to the position of the electric device 3, engages with the drawer mechanism of the cart 3a, compressing the return spring 15 and moving the side plate 4 together with the shielding plate 5 in the insertion direction of the electric device 3. When the insertion operation is completed, the shielding plate 5, which is a grounded metal connected to the side plate 4, is stored between the electric device 3 and the high-voltage unit 20 with the partition plate 11 sandwiched therebetween, completing the movement. Also, an insulation distance between the shielding plate 5 and the high-voltage charging unit 2b is ensured.

During the withdrawal operation, the side plate 4 is returned to the withdrawn position by the return spring 15 connected to the slide link 9, and when the withdrawal operation is completed, the connection port 2a of the bushing 2 is covered by the shielding plate 5 and the opening and closing plates 61a, 61b due to the opening and closing mechanism of the connecting link 17 and the opening and closing plate links 14a, 14b.
The side plate 4, which has a side plate bottom portion 4a and a side plate support portion 4b, has an L-shaped side surface, and the side surface of the side plate bottom portion 4a is guided by the rail 7, allowing the side plate 4 to move smoothly. In this way, since the side plate 4 is supported by the L-shaped side plate bottom portion 4a, the side plate 4 can be supported without providing an additional guide rail or the like on the upper portion of the side plate support portion 4b. Note that the side plate 4 is not limited to being L-shaped, and may have other shapes as long as the side plate 4 can be supported by the side plate bottom portion 4a and the rail 7.

The side plate 4 is guided by the rail 7 that guides the insertion and withdrawal of the withdrawable electric device 3, so that the shielding plate 5 for preventing electric shock can be moved with a simple structure. This provides a drawer device for the electric device 3 that can protect the worker from touching the high-voltage charging section 2b when the electric device 3 is drawn out for inspection.
In addition, by supporting the side plate bottom 4a with the rails 7, it is possible to prevent the shielding plate 5 from falling over during movement. Furthermore, by dividing the shielding plate 5 and fixing it to the side plate 4, it is possible to reduce the size and weight of the shielding plate 5. In addition, since the opening and closing mechanism of the opening and closing plates 61a, 61b is driven by engaging with a drawer mechanism provided on the carriage 3a of the electric device 3, it is possible to omit extra structure in the main body of the electric device 3, and it is possible to standardize the drawer-out electric device 3.

In addition, in the first embodiment, the connecting link 17 for driving the opening/closing plate links 14a, 14b is provided between the side plates 4, but the link for driving the opening/closing plate links 14a, 14b may be provided on the floor plate 12. In this case, the same effect can be expected, and the structure for providing the link on the side plate 4 can be simplified.
Furthermore, in embodiment 1, a pair of side plate bottoms 4a are provided on the inside of a pair of rails 7, but they may also be provided on the outside of the rails 7, and similar effects can be expected even if there is not enough dimension to provide the side plate bottoms 4a on the inside of the rails 7.

Although exemplary embodiments are described herein, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are expected within the scope of the technology disclosed in the present specification, including, for example, modifying, adding, or omitting at least one component.

1 Metal enclosed switchgear, 2 Bushing, 2a Connection port, 2b High voltage charging section, 3 Electrical equipment, 3a Bogie, 4 Side plate, 4a Side plate bottom, 4b Side plate support section, 4c Frame section, 5 Shielding plate, 5a Opening, 6 Opening/closing plate guide rail, 61a, 61b Opening/closing plate, 7 Rail, 9 Slide link, 10 Compartment, 11 Partition plate, 12 Floor plate, 13 Ceiling plate, 14a, 14b Opening/closing plate link, 15 Return spring, 17 Connecting link, 20 High voltage section.

Claims (5)

An electric equipment pull-out device for inserting and removing an electric equipment from a connection port of a high voltage section of a switchgear,
a shielding plate provided between the high voltage section and the electric device, the shielding plate having an opening corresponding to the connection port and being electrically grounded;
A pair of side plates supporting the shielding plate from both sides;
a pair of rails that support the side plates and move the side plates together with the shielding plate in a direction in which the electric device is inserted or removed;
a slide mechanism that moves a side plate so that the shielding plate covers the periphery of the connection port of the high voltage unit when the electric device is in the pulled-out position, and so that the shielding plate is stored between the electric device and the high voltage unit when the electric device is in the inserted position;
A drawer device for electrical equipment, comprising: an opening/closing plate for opening and closing the opening of the shielding plate;
an opening/closing mechanism that opens and closes the opening plate so as to close the opening when the electrical device is in the pulled-out position and to open the opening when the electrical device is in the inserted position;
2. The electrical device drawer according to claim 1 , further comprising: 3. The electrical device drawer device according to claim 1 , wherein the shielding plate is divided into a plurality of pieces and provided between the pair of side plates. A switchgear comprising the pull-out device for an electric device according to any one of claims 1 to 3. A switch gear in which an electric device that moves in an inserting/removing direction is stored, and a connection portion of the electric device and a high-voltage charging portion are connected via a connection port of a high-voltage portion when the electric device is inserted,
a shielding plate having an opening that can be opened and closed by an opening/closing plate at a position corresponding to the connection port, the shielding plate being disposed on the high-voltage section side when inserted relative to a position when removed to shield the high-voltage section;
a side plate having a bottom portion extending in the insertion/removal direction and a support portion erected from the bottom portion and to which the shielding plate is attached;
and a rail that guides a bottom portion of the side plate so that the side plate moves in an insertion/removal direction.

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