JPS61262009A - Ground unit for closed power board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a grounding device mounted on a closed switchboard.

[Technical background of the invention and its problems]

As is well known, in closed switchboards in which switching equipment is housed so that they can be freely drawn out, a grounding device is often provided to prevent electric shocks caused by load equipment after the switching equipment is pulled out.

By the way, in the conventional grounding device, the rotation shaft of the lever for moving and operating the opening/closing device and the rotation shaft of the grounding device main body for opening and closing the grounding device are provided in a horizontal state. The reason for this is that the main circuit disconnection section for allowing the opening/closing device to be freely drawn out is arranged in a horizontal state.

However, in recent years, there has been a strong desire to downsize substations and electrical rooms, and with the development of downsized switchgears filled with insulating gas, downsizing is becoming a reality. Closed switchboards are no exception and must be downsized, but the best way to do this is to reduce the panel width (hereinafter referred to as panel width), and to arrange the main circuit disconnection section (hereinafter referred to as PDS) vertically. There is a need to.

If the PDS is installed vertically to reduce the width of the panel, the grounding device connected to the PDS has a rotating shaft that is spaced apart from the rotating shaft of the lever for moving the opening/closing equipment. The relationship is orthogonal to each other. This makes it impossible to use conventional spatially parallel operating mechanisms. There are also devices that open and close using the elastic force of a spring as an operating force, but they have reliability problems because they depend on the characteristics of the spring itself.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding device for a closed power distribution board that is capable of smoothly and reliably grounding even a reduced panel width.

[Summary of the invention]

The present invention includes a first link that is movable in the longitudinal direction by an opening/closing device that is housed in a closure box so as to be freely drawn out, and a lever device that engages with the first link and is rotatably attached to the closure box. , a blade device that engages with this lever device via a second link and rotates in the vertical direction, and a conductor that connects to the load side main circuit and comes into contact with this blade device at a predetermined time, and connects switching equipment. The main circuit on the load side is grounded in conjunction with the withdrawal from the position.

[Embodiments of the invention]

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the grounding device for a closed switchboard according to the present invention will be described with reference to the drawings. First, the configuration for moving the switchgear that is removably housed inside the closed switchboard will be described. In FIGS. 1 and 2, a lever 1 is a component of a drawer device (not shown) attached to a closure box 2, and is rotatably attached to a side wall 2a with a shaft 3, and a pin 4a provided on an opening/closing device 4. is engaged in. That is, when a drawer device (not shown) is operated, the lever 1 rotates to move the opening/closing device 4 that is engaged through the pin 4a, thereby bringing it into contact with and separating from the main circuit disconnecting section 5.

Next, grounding equipment! [10 is a link 11 whose one end is connected to the lever 1, a lever device 12 which is connected to the other end of this link 11 and is rotatably attached to the side walls 2a and 2b of the closure box 2, and this lever device. A link 13 connected to 12 and movable in the longitudinal direction, and a blade assembly connected to this link 13 and rotatably attached to the side wall 2b of the closed box 2! ! 14 and is attached to the main circuit disconnection section 5,
A conductor 15 that comes into contact with the blade device 14 at a predetermined time (at the time of grounding)
It consists of

The link 11 is provided with a long hole 11a at one end, and a pin 1a provided on the lever 1 is inserted into this long hole 11a to connect the links. Therefore, even if the lever 1 rotates according to the movement range of the opening/closing device 4, the lever 11 does not move with the blade. [14] The amount of movement can be adjusted by rotating the lever device 12 by the required angle. Lever device 12
As shown in FIGS. 3, 4 and 5, the support plate 16
a and 16b, and a lever 18 that is fixedly attached to the negative side of the shaft 17 in the longitudinal direction and has a hole 18a into which the pin llb of the link 11 is inserted. and.

The lever 19 is fixedly attached to the other side of the shaft 17 and has a long hole 19a into which the pin 13a of the link 13 is inserted. Therefore, even if the lever device 12 rotates, the link 13 moves horizontally. In order to support the horizontal movement of the link 13, a guide support plate 20 is attached to the side wall 2b of the closure box 2. This guide support plate 20 is the sixth
As shown in Figures 1 and 7, there is an upper plate 21 provided with a long hole 21a into which a pin 13b attached to the end of the link 13 is movably inserted; A long hole 22 that is the same as and concentric with 21a.
It consists of a lower plate 22 provided with a. As shown in FIGS. 8 and 9, the blade device 14 is rotatably attached to the upper plate 21 of the guide support plate 20 and a support plate 23 that faces the lower part of the upper plate 21 and is attached to the side wall 2b. The shaft 24 has one end fixed to this shaft 24, and when the end is bent into an L shape and the shaft 24 rotates approximately 90 degrees, each conductor attached to the three load-side main circuit disconnecting parts 5 15, and a length that is attached to the upper part of the shaft 24 at an angle (approximately 135°) with the blades 25, and into which the pin 13b of the link 13 is movably inserted. It consists of a lever 26 provided with a hole 26a. The arrangement of the lever device 12, the link 13, and the blade device is shown in FIG.

Next, the operation of the above configuration will be explained. When the operating handle (not shown) is operated and the lever 1 of the drawer device moves from the A position (disconnecting position of the opening/closing device 4) shown in FIG. 2 to the B position (the connecting position of the opening/closing device 4).

A link 11 connected to this lever 1 rotates the lever device 12 by rotating the stroke g4nt. This rotation of the lever device 12 causes the link 13 to move horizontally in the longitudinal direction, thereby rotating the blade device 14. This causes the blade 25 to rotate away from the conductor 15 to the position shown in solid line in FIG. Next, the operation handle (not shown) is operated in the opposite direction, and the lever 1 of the drawer device moves from the B position (connection position of the opening/closing device 4) shown in FIG. 2 to the A position 1i! (When the opening/closing device 4 moves to the disconnection position I, the link 11 adjusts its stroke and rotates the lever device 12 to the position shown by the dashed line in the figure. This rotation of the lever device ffi!12 causes the link 13 moves horizontally in the opposite direction in the longitudinal direction, and the blade device 1
14 is rotated to the position shown by the dashed line in FIG. 1, and the blade 25 is brought into contact with the conductor 15 and grounded.

Therefore, even if the panel width is narrow and the lever 1 of the pull-out device of the opening/closing device 4 and the shaft 24 of the blade device 14 are spatially orthogonal, the blade will move from the connecting position of the opening/closing device 4 to the new path position. By rotating the device 14, the load-side main circuit can be reliably grounded.

Furthermore, by providing the elongated hole 11a in the link 11, the earthing device [10
You can adjust the stroke you need.

In addition, in the above explanation, the lever 2 of the blade device 14
6 is provided with a long hole 26a for engagement with the pin 13b of the link 13, but as shown in FIG. 11, two substantially orthogonal sides 30a and 30b may be provided for engagement. However, in this case, the angle at which the blade device rotates is 90° or less.

〔Effect of the invention〕

Since the present invention is configured as described above, even when the width of the panel is reduced, when the switchgear is moved from the connection position to the pull-out direction, the main circuit on the load side can be moved smoothly and reliably in conjunction with this movement. It can be grounded to prevent ground fault accidents and ensure safety.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the grounding device for a closed switchboard according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1 and viewed in the direction of the arrow, and FIG. FIG. 4 is a front view showing essential parts of an embodiment of the present invention, FIG. 4 is a side view seen in the direction of arrow A in FIG. 3, FIG. 5 is a side view seen in the direction of arrow B in FIG.
The figure is a sectional view taken along line B-B in Figure 1 and viewed in the direction of the arrow, Figure 7 is a plan view viewed in the direction of arrow A in Figure 6, and Figure 8
The drawings are a front view of an embodiment of the present invention showing important parts different from those in Fig. 3, Fig. 9 is a plan view seen in the direction of arrow A in Fig. 8, and Fig. 10
The figure is a sectional view taken along the line CC in FIG. 1 and viewed in the direction of the arrow, and FIG. 11 is a plan view showing the main parts of another embodiment of the present invention. 1...Lever 2...Closing box 4...Opening/closing device 5...Main circuit disconnection section 11.13...
・Link 12... Lever device 14... Blade device 15... Conductor (8733) Agent Patent attorney Yoshiaki Inomata (and 1 other person) Figure 1 @ Figure 2 Figure 10 Figure 3 Figure 4 Part 5 National policy 6
Figure/J Figure 7 Figure 8 Figure 9

Claims (3)

[Claims] (1) A first link that is movable in the longitudinal direction by an opening/closing device that is removably housed in a closed box, and a lever device that engages with this first link and is rotatably attached to the closed box. , a blade device that engages this lever device via a second link and rotates in a vertical direction, and a conductor that connects to the load side main circuit and contacts this blade device at a predetermined time. Device. (2) The grounding device for a closed switchboard according to claim 1, wherein the first link is provided with a long hole along the longitudinal direction and engages with the lever device. (3) A grounding device for a closed switchboard according to claim 1, wherein the second link is arranged horizontally and is movable in the longitudinal direction.