JPS6120811Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disconnection section structure of a closed switchboard (such as a control center).

Generally closed switchboard (e.g. control center)
As shown in FIGS. 1a and 1b, a horizontal busbar 8 is constructed in a closed box 7, each phase is connected to a vertical busbar 1, and the vertical busbar 1 and each unit device 9 are connected to a disconnecting section finger 3.
connected by. Further, the vertical bus bar 1 is firmly held by a holder 6 in order to withstand the strength when a fault current passes through it. Next, details of the disconnecting section will be explained with reference to FIG. Figure 2 shows three-phase R,
This is a detailed view showing one phase of S and T, and the vertical bus bar 1 is constructed by vertically arranging flat conductors, and is firmly held from both sides by holders 6. The disconnector finger 3 on the unit device side is fixed by a base 2 on the unit device, and is connected to equipment within the unit device by an electric wire 5.

The problems with the above configuration are as follows: (1) The horizontal section modulus of the vertical bus bar itself is small, so it is weak in strength when a fault current passes through it, and therefore must be held with many holders.

(2) To increase the current carrying capacity of the unit device itself, and
To make it less susceptible to damage when fault current passes through,
It is necessary to increase the contact pressure between the vertical busbar and the disconnection finger.

(3) Relative errors between the disconnection finger and the vertical busbar tend to occur, and it is necessary to absorb the play.

(4) When the disconnection finger is configured as one unit, it is difficult to connect it to the electric wire.

The object of the present invention is to solve the above-mentioned problems and provide a primary disconnecting device for a closed switchboard with a simple structure and low cost.

An embodiment of the present invention will be described below with reference to FIGS. 3a and 3b.
Explain in detail.

The vertical busbar 11 is formed by bending a flat conductor into an L-shaped cross section, and then bending one side of the L-shaped cross section toward the other side to form a V-shaped cross section. The other side of the L-shaped cross section is fixed to an insulating holder 13 with a screw 12, forming a wedge-shaped portion 11a that continues vertically on the front surface facing a unit device (not shown). The vertical busbar 11 is made of a spring conductor (e.g., an iron-based copper alloy) that has a higher spring limit value than copper, and the wedge-shaped portion 11
The disconnecting finger 14, which is connected to and disconnected from the vertical bus bar 11, is made of a rectangular flat conductor, and one end of the finger 14 in the longitudinal direction is connected to the wedge-shaped portion 11a of the vertical bus bar 11.
A U-shaped notch 15 is formed in the middle of the longitudinal direction of the finger base 16.
A hole 17 is formed in the finger base 16 for rotatably supporting the finger 14, and a connection hole 18 is formed in the other longitudinal end for connecting the conductor 5. The finger base 16 is configured to sandwich the disconnecting finger 14 from above and below, and has a shaft 19 for engaging with the hole 17.

In such a primary disconnect device, when a unit device is inserted, the disconnect section finger 14 integrated with the unit device
also moves, and the notch 15 fits into and contacts the wedge-shaped portion 11a of the vertical generatrix 11. In this case wedge-shaped part 1
Since 1a is constructed by bending a flat plate into a V-shape, the contact portion can obtain high contact pressure due to the horizontal elasticity and wedge effect of the wedge-shaped portion 11a. Therefore, even if a fault current flows through the vertical bus bar 11 and a repulsive force occurs, separation or damage will not occur between the wedge-shaped portion 11a and the notch 15.

In addition, since the vertical generatrix 11 is constructed by bending a flat plate into an L-shape and further bending the portion constituting one side into a V-shape, the heat dissipation area and lateral section modulus of this embodiment are different from those of this embodiment. In each case, it increases approximately three times,
Since the current carrying capacity can be increased and the strength can be increased, the holder 13 can be made smaller.

Further, the disconnecting finger 14 is supported by the rotary shaft 19 of the finger stand 16 so as to be rotatable in the horizontal direction between the stoppers 20 and 21, and the wedge-shaped portion 11a of the vertical generatrix 11 is formed continuously in the vertical direction. Therefore, even if there is an assembly error between the unit device and the vertical bus bar 11, it can be easily absorbed.

In addition, the disconnector finger 14 can be constructed from a single flat plate, and can be connected to the electric wire 5 by screwing through the connection hole 18, so that it can be constructed at low cost.

Note that the vertical bus bar 11 may have any other shape as long as it has a wedge-shaped portion with a V-shaped cross section, and the disconnecting section fingers may be formed using a conductor with the same high spring limit value as the vertical bus bar. You can.

The effects of the present invention described above are listed below.

(1) Since the lateral section modulus of the vertical bus bar itself is increased, it is strong in terms of strength when a fault current passes through it, and therefore the bus bar can be easily held.

(2) Since the contact pressure between the vertical busbar and the disconnection finger is obtained by the vertical busbar's own elasticity and wedge effect, the contact pressure is high, and when a fault current passes through, the connection part is less likely to generate repulsive force and is less likely to be damaged. Hateful.

(3) Since the heat dissipation area of the vertical bus bar is large, the cooling effect is large and the current capacity can be increased.

(4) Since the disconnecting section finger can be made of a single piece, it is inexpensive, and errors can be absorbed and electric wires can be connected at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a closed switchboard, a is a plan view, b is a sectional view taken along the line A-A, and Fig. 2 is a configuration diagram showing a conventional primary disconnection device; -B
Cross-sectional view b is a view of FIG. 2 a seen in the DD direction,
FIG. 3 is a block diagram of an embodiment of the present invention, in which a is a plan view and b is a sectional view taken along the direction of the arrow E-E. 11... Vertical generatrix, 11a... Wedge-shaped portion, 13...
... Holder, 14 ... Disconnection part finger, 15 ... Notch, 16 ... Finger stand, 17, 18 ... Hole,
19...Rotation axis.

Claims (1)

[Scope of utility model registration request] A device comprising a vertical bus bar housed in a closed switchboard, and a disconnecting finger provided on the back of a unit device that is embedded in the vertical bus bar and is housed in the closed switchboard so as to be freely put in and taken out, the vertical bus bar being A wedge-shaped portion having a V-shaped cross section and having elasticity in the horizontal direction is formed continuously in the vertical direction at a portion that contacts the disconnecting portion finger, and the disconnecting portion finger is made of one flat plate and is fitted into the wedge-shaped portion of the vertical generatrix. 1. A primary disconnect device for a closed switchboard, characterized in that a notch is formed to fit together and make contact, and is attached to the unit device so as to be rotatable in a horizontal direction.