JPH07118848B2 - Grounding device for drawer type transformer of switchboard - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grounding device for a drawer type transformer of a switchboard, which moves a transformer mounted on a trolley by operating an operating shaft between a disconnecting position and an operating position. Regarding

[Conventional technology]

A conventional grounding device for a drawer type transformer of a switchboard is disclosed in Japanese Utility Model Laid-Open No. Sho 58-58206 (hereinafter referred to as a document). In this document, in a transformer device mounted on a moving carriage and capable of coming into contact with and separating from a main circuit by the movement of the moving carriage,
An inspection window for internal inspection is provided on the front panel of the mobile trolley, and this inspection window is covered by a safety inspection plate that can be pulled out to the outer periphery by sliding the panel surface, and this safety inspection plate is used except at the disconnecting position of the transformer. A baffle that prevents it from being pulled out is provided on the outer periphery of the panel.

And although there is no description about grounding, the front panel,
It is shown that the J-shaped fixed grounding terminal provided separately from the safety inspection plate and the baffle plate and the movable grounding terminal on the dolly side contact at the disconnection position.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technology, as an interlock mechanism that allows safe inspection of the transformer only at the disconnection position, a panel with a safety inspection plate that can be opened and closed on the inspection window is provided on the truck, and the board side is obstructed. This is a complicated and large structure in which a plate is provided, and a grounding device is provided separately from this structure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grounding device for a drawer type transformer of a switchboard in which the inspection window interlock mechanism is simplified and opening / closing of the inspection window is directly related to contact / separation of the grounding device. .

[Means for Solving the Problems]

A grounding device for a drawer type transformer of a switchboard according to the present invention is a grounding device for a drawer type transformer of a switchboard, wherein a transformer mounted on a trolley is moved by operating an operating shaft between a disconnection position and an operating position. An openable and closable inspection cover attached to an inspection window on a wall of the chamber and a link mechanism having an input end and an output end attached to the wall are provided, and the input is normally made by a spring or its own weight. The end is located below and the output end is arranged to lock the latch to prevent the inspection cover from opening, and the input end is grounded to move the carriage to the disconnecting position. A movable ground contactor attached to this trolley and having a sloped surface pushes up the input end.

[Action]

When the operating shaft is operated to move the transformer mounted on the truck to the disconnection position, the slope of the movable ground contact of the transformer mounted on the truck pushes up the input end of the link mechanism. Then, since the input terminal is grounded, the transformer is grounded. At the same time, when the input end is pushed up, the output end of the link mechanism unlocks the latch and the inspection cover can be opened.

When the inspection cover is closed and the carriage is moved toward the driving position, the output end of the link mechanism locks the latch with a spring or its own weight, so that the inspection cover cannot be opened.

〔Example〕

1 is a side sectional view of the embodiment, FIG. 2 is a front view of the inspection cover provided on the wall of FIG. 1 as seen from the inside, and FIG. 3 is a rear view of the locking device for the operating shaft of FIG. Is.

In the transformer room 1, which is located on the upper rear part of the switchboard and surrounded by the ceiling 1a, the wall 1b, the floor 1c, and the partition plate 1d for the bus room, the transformer 3 for equipment mounted on the truck 2 is driven by the wheels 2a. It moves between a position L (shown by a solid line) and a disconnection position T (shown by a one-dot chain line).

In order to move the trolley 2 on which the transformer 3 is mounted, the operation shaft 4 projecting to the rear surface of the switchboard is rotated by a handle (not shown), and is engaged with the trolley 2 and screwed into the male screw of the operation shaft 4. The carriage is moved by the moving nut 5. Driving position L
Then, the movable contactor 7 attached to the carriage 2 via the insulator 6 contacts a fixed contactor (not shown) in the bushing 8 to connect the transformer 3 to the busbar. In the moving position L, the movable ground contactor 9 provided on the transformer 3 is not in contact with anything. The end of the shaft for attaching and detaching the handle of the operation shaft 4 is covered with an openable / closable lid 10 and can be locked with a lock 11.

The inspection cover 13 that opens and closes the inspection window 12 on the rear wall 1b has a screw number 13
It is attached to the wall 1b at a and has a latch 14 fixedly provided.
In the wall 1b, a rod 15 having an output end 15a, a rod 16 having an input end 16a, a link 17 connecting the rods 15 and 16 and rotating around a pin 17a of the wall 1b constitutes a link mechanism 18, and In addition to the pin 17a, a plurality of guides 19 are installed on the wall 1b. The pin 17a of the link 17 is closer to the rod 16, and the slight movement of the rod 16 is enlarged so that the output end 15a of the rod 15 largely moves in and out of the latch to lock or unlock the latch. To do. The link mechanism 18 can be replaced with a conventional one other than the one shown.

Considering the expansion of the movement of the link 17, the weight of the rod 16 is set sufficiently larger than the weight of the rod 15 so that the rod 16 of the link mechanism 18 is normally located below and the output end 15 of the rod 15 is
Make sure that a is locked by the latch 14. It is also possible to use a spring or the like (not shown) without using the most weight.

The rod 16 and the like are always grounded to the wall 1b using a conductive material. In some cases, if the ground resistance with the guide 19 is large, the rod 16 may be grounded by a flexible conductor (not shown).

The input end 16a of the rod 16 is a roller. On the other hand, the movable ground contactor 9 provided in the transformer 3 has a slope 9a, and when the carriage 2 reaches the disconnecting position T, the slope 9a is in a positional relationship of pushing up the roller of the input end 16a of the rod 16.

According to such a structure, as described in the action section,
When the operating shaft 4 is operated to move the transformer 3 mounted on the truck 2 to the disconnection position T, the slope 9a of the movable ground contact 9 of the transformer 3 mounted on the truck 2 causes the input end 16a of the link mechanism 18 to move. It will be pushed up. Then, since the input terminal 16a is grounded, the transformer 3 is grounded. At the same time, when the input end 16a is pushed up, the output end 15a of the link mechanism 18 unlocks the latch 14 so that the inspection cover 13 can be opened.

When the inspection cover 13 is closed and the carriage 2 is moved toward the operating position L, the output end 15a of the link mechanism 18 locks the latch 14 with a spring or its own weight, so that the inspection cover 13 cannot be opened.

〔The invention's effect〕

A grounding device for a drawer type transformer of a switchboard according to the present invention includes an openable and closable inspection cover attached to an inspection window on a wall of a transformer room and an input end and an output end attached to the wall. A link mechanism provided is provided, and the input end is normally positioned downward by a spring or its own weight so that the output end locks the latch and prevents the inspection cover from opening. When the input end is grounded and the dolly is moved to the disconnecting position, the movable ground contactor attached to this dolly and having a sloped surface pushes up the input end, so that it can be opened only at the disconnecting position of the transformer. The interlocking mechanism of the inspection window that should be done is simple and arranged along the wall,
The contact and separation of the movable ground contactor of the transformer directly acted on the interlock mechanism, and the structure was simple and there were no malfunctions, and the interlock mechanism and ground mechanism were downsized, and the transformer room and switchboard were The effect is that it can be made small.

[Brief description of drawings]

1 is a side sectional view of the embodiment, FIG. 2 is a front view of the inspection cover provided on the wall of FIG. 1 as seen from the inside, and FIG. 3 is a rear view of the locking device for the operating shaft of FIG. Is. 1 ... transformer room, 2 ... carriage, 3 ... transformer, 4 ... operation axis, 5 ... moving nut, 9 ... movable ground contactor, 9a ...
… Slope, 11 …… Lock, 13 …… Inspection cover, 14 …… Latch, 1
5,16 …… Rod, 15a …… Input end, 16a …… Output end, 18…
… Link mechanism.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // H02B 1/30

Claims (1)

[Claims] 1. A grounding device for a drawer type transformer of a switchboard, wherein a transformer mounted on a trolley is moved between a disconnecting position and an operating position by operating an operating shaft, and the grounding device is attached to an inspection window on a wall of a transformer room. An openable / closable inspection cover provided with a latch and a link mechanism attached to the wall and having an input end and an output end are provided, and the input end is normally positioned downward by a spring or by its own weight. The end is arranged so as to lock the latch and prevent the inspection cover from opening, and the input end is grounded, and when the bogie is moved to the disconnection position, the slope attached to the bogie is changed. A grounding device for a drawer-type transformer of a switchboard, characterized in that a movable grounding contact provided therein pushes up the input end.