JPS5937647B2 - Sealed switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed type switchgear with an improved arrangement of equipment.

Conventional SF6 gas-sealed switchgear is mainly composed of a circuit breaker, and devices such as a disconnector and a grounding device are assembled into each unit and connected to each other.Generally, the circuit breaker, disconnector, and The grounding device usually employs a so-called vertical cut, which opens and closes in a direction perpendicular to the floor surface.

Therefore, since the opening/closing mechanism and the operating mechanism section of the equipment that needs to be opened and closed are provided at the upper or lower part of each equipment, the height of the apparatus is very large.

On the other hand, the demand for closed-type switchgear installed indoors, such as underground in urban centers, is increasing.

However, when installing indoors, there are restrictions on the floor height of the building.
The height dimension is becoming more important than the width dimension.

Furthermore, in vertical cutting of disconnectors and grounding devices, metal powder due to sliding or products due to current interruption accumulate on the horizontally arranged insulating spacer that insulates and supports the contact part.
Dielectric strength may decrease and dielectric breakdown may occur.

Furthermore, when opening and closing disconnectors and grounding devices, the self-weight of the movable contact acts in opposite directions when it is "open" and when it is "closed," so there is a problem that the percentages in opening and closing are different.

An object of the present invention is to provide a closed type switchgear that uses a horizontal disconnect switch and a grounding device to reduce the overall height of the device, and also eliminates the disadvantages of using a vertical disconnect switch and a ground device. It is on offer.

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

In this embodiment, a three-phase device configuration will be described.

FIG. 1 is a power distribution system diagram to which the sealed switchgear of this embodiment is applied, in which the load TrK is
It supplies electric power, and one line L1 reaches the cable head CH2 on the load side via the cable head CH1, the grounding device ES1, the breaker CB, the disconnecting device DS2, and the grounding device ES2.

Furthermore, the other circuit L2 has the same configuration as the line L1,
Lines L1 and L2 are connected to a disconnector DS3. Contact via DS4.

An earth protector LA and a grounding device E are installed between disconnectors DS3 and DS4.
Place S3 and cable pend CH3.

The closed type switchgear of this embodiment used in the system diagram shown in FIG. 1 is arranged as shown in FIGS. 2 and 3.

That is, as shown in a plan view in FIG. 2 and a side view in FIG. DS2゜DS3. DS4, grounding device ES
1, ES2, ES3, and the earth protector LA are interconnected and configured to be reduced in size.

Among these, devices with opening/closing operations other than the breaker CB, that is, the disconnectors D81 to D84 and the earthing devices ESI to 3, are as follows:
A horizontal opening/closing device arranged so that it can be opened and closed horizontally to the floor.

That is, FIGS. 4 and 5 show plan and side sectional views of the disconnectors DS2 and DS3 and the grounding device ES2 in the line L1 of FIGS. 2 and 3, respectively.

Further, a sectional view taken along the line A-A in FIG. 5 is shown in FIG. 6.

In the figure, an outlet conductor 1 of a vertically placed breaker CB is insulated and supported by an insulating spacer 2 placed vertically between the breaker CB and a disconnector DS2, and a fixed side conductor 3 of the disconnector DS2 is placed horizontally. Configure.

The disconnector DS2 is opened and closed by moving the movable contact 4 into and out of contact with the fixed conductor 3 horizontally through a gear 6 provided in the horizontally arranged sliding conductor 5 by zero rotation of the insulated iron door. .

This insulating rod 7 is rotated by a drive from an operating mechanism 8.

To open and close the earthing device ES2, the movable contact 9 is connected to the disconnector D via the opening and closing mechanism 11 from the operating mechanism 10 provided outside.
This is carried out by horizontally coming into contact with and separating from the horizontally arranged sliding conductor 5 of S2.

A disconnector DS3 connected to the disconnector DS2 is partitioned by a vertically arranged insulating spacer 12, and the sliding conductor 13 is further connected to the cable head CH2 via a vertically arranged insulating spacer 14.

The disconnector DS3 connects and disconnects the horizontally arranged sliding conductor 13 and the communication bus bar 15, and has a horizontally arranged fixed conductor 16 and a movable contact 11.

The disconnector DS3 is opened and closed by an operating mechanism 18 provided with the movable contact 1γ on the outside by horizontally moving it into contact with and separating from the fixed conductor 16 via an opening and closing mechanism 19.

As mentioned here, disconnector D S 27 D S 3
And the earthing device ES2 is a so-called horizontal opening/closing device.

Insulating spacers that support the conductors of each device are all arranged vertically.

Furthermore, disconnector DS1, disconnector DS4, earthing device ES1
has the same structure as the disconnector DS2, the disconnector DS3, and the earthing device ES2 shown in FIG. Omitted.

In this case, all the insulating spacers supporting the conductors of each device are arranged vertically.

In this embodiment, by configuring the switching devices of the disconnectors DSI to DS4 and the grounding devices ESI to ES3 in a horizontal manner, the switching mechanism and the operating mechanism can be installed outside in the horizontal direction. The height of the container CB can be reduced and the size can be made smaller.

This horizontal external space is
This was necessary as a space for the operation mechanism to be placed outside, and does not result in an increase in the width direction.

In addition, the disconnector DSI connected to the vertically arranged circuit breaker CB
, DS2, etc. are vertically spaced apart and arranged horizontally, and the connections between the devices are arranged three-dimensionally, making it possible to provide a compact opening/closing device that makes effective use of space.

Further, as shown in FIG. 4, metal powder and products may be generated due to sliding and current interruption inside the disconnectors DS2-D3 and the grounding device ES2.

However, even if metal powder or the like is generated, since all the insulating spacers that support the conductors of the equipment are arranged vertically, there is no risk of metal powder or the like accumulating on the insulating spacers.

Therefore, it is possible to prevent a decrease in dielectric strength due to metal powder generated by the opening/closing operation.

Furthermore, the dead weight of the movable contact during opening and closing of the disconnector and grounding device does not affect the operating force since the disconnector and the grounding device are cut horizontally, so there is no adverse effect on the switching characteristics.

Although this example describes a three-phase equipment configuration, even in a single-phase equipment arrangement, switchgear such as disconnectors and grounding devices are cut horizontally, and all insulating spacers that support the equipment conductors are placed vertically. By arranging them, similar effects can be obtained.

As explained above, according to the present invention, devices that require opening/closing operations such as disconnecting switches and grounding devices connected to vertical circuit breakers are cut horizontally, and all insulating spacers connected to the devices are arranged vertically. As a result, the height of the entire device is significantly reduced, and by arranging the equipment three-dimensionally, the installation area of the switchgear does not increase, and the closed type switchgear has improved insulation and switching characteristics. Can you provide?

[Brief explanation of the drawing]

Fig. 1 is a power distribution system diagram showing one embodiment of the present invention, Figs. 2 and 3 are a plan view and a side view of Fig. 1 adopted in a closed type switchgear, and Fig. 4 is Fig. 2 L1. Enlarged partial sectional view of
Figure 5 is an enlarged side view showing the section of Figure 3;
The figure is a sectional view taken along line A--A in FIG. 5. CB......breaker, DSI~4...disconnector, ES1~3...earthing device, Cl-Tl~
3...Cable head, LA...Earth protector, Tr...Transformer, 2゜12.14...
...Insulating spacer, 3,16...Fixed side conductor,
4, 9, 17... Movable contact, 5, 13...
...Sliding side conductor.

Claims (1)

[Claims] 1. In gas-sealed switchgear consisting of circuit breakers, disconnectors, grounding devices, etc., the fixed side conductor and sliding of all disconnectors, grounding devices, etc. that are connected to vertical circuit breakers, and equipment that has opening/closing operations. Place the side conductor horizontally to the floor,
A closed type switchgear characterized in that a movable contact that opens and closes between the conductors is operated horizontally, and all insulating spacers that support the conductors of a device that has an opening and closing operation are arranged vertically.