JPS5832409Y2 - Collective switchboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power distribution board in which a large number of units are stacked and housed, and more particularly to a power supply bus that connects each unit to a power source.

Generally, in various industrial facilities such as power plants and steel plants,
When controlling a large number of electric motors centrally, a collective switchboard is used in which the control devices are grouped into units and the plurality of units are stacked and stored all at once.

Such a collective switchboard has a number of chambers formed within an outer frame by partition plates added in the vertical direction and shelves installed in the horizontal direction, and units can be stored in each chamber in a freely insertable and removable manner. .

In addition, the space behind the unit storage room becomes a busbar room, and a busbar (vertical busbar) is stretched vertically into this busbar room, and when a unit unit is inserted, the vertical busbar and the power contactor fixed to the unit i are connected. An electrical connection is automatically made by touching the

Further, a horizontal busbar is stretched over the top of the busbar room, and a vertical busbar is electrically connected to this horizontal busbar.

Such a collective switchboard is usually called a control center and is well known.

In addition, such a collective switchboard is generally used in a row of panels.

Therefore, the horizontal busbar is stretched through the collective type switchboards that serve as the parallel panels.

By the way, the vertical bus bars of conventional collective switchboards are left bare in the form of strips.

Therefore, the following problems arise.

That is, when conductive dust accumulates on the support stand of a vertical busbar in a steel mill or the like, and a short circuit occurs between phases, a short circuit arc and conductive gas are generated.

It is known to those skilled in the art that conductive gases are generated.

This causes a secondary short circuit in the form of a short circuit across the entire horizontal bus bar, leading to a major accident in which a series of collective switchboards, which are arranged in parallel, are burned out.

In addition, devices such as relays for increasing the contact width are attached to the back of the unit.

On the other hand, there are units within the same panel that cannot be stopped because they drive important equipment.

Therefore, maintenance and inspection of units that drive non-critical equipment and instruments attached to the back of the units are performed while the vertical busbar is live.

As a result, the risk of electric shock to workers resulting in personal injury becomes extremely high.

It has been proposed to provide an insulating cover surrounding the vertical bus bar to prevent power short circuits and personal injury.

The insulating covers that have been proposed so far are positioned according to the size of the units to be stacked, and are pre-drilled with openings for receiving power supply contacts.

However, the size of the unit is often changed depending on the driving electric motor due to design changes or modifications.

Therefore, each time the unit is changed, it is necessary to drill a receiving hole in the insulating cover, which is extremely troublesome.

The present invention was developed in response to the above-mentioned problems, and its purpose is to provide a collective switchboard that can reliably prevent power supply short circuits and personal accidents, and also allows the position of the power contact socket to be easily changed. It is in.

The feature of the present invention is that the vertical bus bar is surrounded by an insulating cover, and a number of notches for blank punched holes are formed at regular intervals in the vertical direction of the insulating cover to form a receiving opening for receiving a power contact. The receiving opening is formed by pressing the cut portion of the blank punched hole with a tool and removing it.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, a housing 2 is provided with a plurality of partition plates 4. As shown in FIG.

A guide 5 for inserting the unit 8 is provided on the partition plate 4.

The vertical generatrix 3 is held by a generatrix holder 9 so that the two faces are parallel to each other.

A power contact T is fixed to the back side of the unit 8.

The vertical bus bar 3 has a U-shaped cross section and has a contact surface for receiving and abutting the power contact T.

The vertical busbar 3 is surrounded by a rectangular parallelepiped insulating cover 6 as shown in FIG.

The insulating cover 6 is provided with rectangular blank punching cuts 6a at intervals of length t.

The cut 6a is formed by making the thickness of most of the blank punched part thinner than other parts of the insulating cover 6, or by providing a rectangular groove.

Further, the interval t is determined by the dimension in the height direction of the smallest unit.

Power contact 7 when the smallest units are stacked in two layers
If the distance between them is Lmin, then t=Lmin.

Of course, the interval t may be a value obtained by dividing Lmin by an integer n.

1 is a horizontal generatrix. In this way, the vertical busbar 3 is surrounded by a transparent insulating cover 6, and cutouts 6a for blank punched holes are formed in the insulating cover 6 at regular intervals so that contacts I of units of various sizes can be inserted. There is.

IjTlin, 3 Lm depending on unit size
In and 3Lzn, the receiving opening for the power contact 7 can be easily formed by pressing the notch 6a where the receiving opening is to be formed with a tool such as a screwdriver.

In addition, in order to confirm whether the unit 8 is inserted into the housing 2 and the power contact I of the unit 8 is completely inserted, a transparent cylindrical insulating case is adopted.

As described above, in one embodiment of the present invention, since the vertical busbars 3 are surrounded by the insulating cover 6, it is possible to prevent phase-to-phase short circuits between the vertical busbars 3 due to dust, etc., and maintenance and inspection can be carried out while the lines are live. However, there is no risk of electric shock, and electric shock accidents can be reliably prevented.

Since the housing and the insulating cover 6 are provided with cutouts for blank punched holes at regular intervals, a receiving opening for the power contact can be easily formed even if the sizes of the units are different.

At this time, it is possible to close the unnecessary receiving opening by pasting the cut portion 9 with adhesive.

As explained above, according to the present invention, short-circuit accidents of vertical busbars can be prevented, electric shock accidents can also be completely eliminated, and in addition,
Even if the size of the unit is changed, a remarkable effect can be achieved in that the position of the receiving port for the power contact can be easily changed.

In the above-mentioned embodiment, the vertical generatrix has a U-shaped cross section, but it goes without saying that it may be simply flat.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention with the door removed, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is a perspective view showing an example of the insulating cover used in the invention. be. 1... Horizontal bus bar, 2... Housing, 3...
... Vertical bus bar, 4 ... Partition plate, 5 ...
...Guide, 6...Insulation cover for vertical bus bar, I
...Power contact, 8...Unit, 9
・・・・・・Vertical busbar holding bracket.

Claims (1)

[Scope of utility model registration request] In a collective switchboard in which a large number of unit units are stacked and housed, and a power contact fixed to each unit is connected to a vertical busbar, the vertical busbar is surrounded by an insulating cover, and the vertical direction of the insulating cover is A collective power distribution board characterized in that a large number of blank punched Okawa cuts are provided at regular intervals for forming a receiving opening for receiving the power contact.