JPS58117612A - Power opening and closing device - 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 The present invention relates to a power switching device that opens and closes an electric circuit.

1 to 4 show an example of a conventional power switchgear. In these figures, (1) is a mounting base made of a metal steel plate, and this mounting base (1) has a plurality of mounting holes (
1a) is provided. (2) is a base made of an insulating material, and is fixed to the mounting base (1) with screws (3). (4) is a fixed core made of laminated silicon steel plates, an operating coil (5) is attached to this fixed core (4), and a leaf spring (6) is installed as a cushioning material in the gap with the mounting base (1). ) are provided. A movable core (7) is disposed opposite the fixed core (4), and is configured to be attracted to the fixed core (4) when the operating coil (5) is energized. (8) is a crossbar made of an insulating material, and is connected to the movable iron core (7) via a pin (9). 0IFi A trip spring installed between this crossbar (8) and the mounting base (1) allows the crossbar to be opened so that the main circuit of this power switchgear is normally open.
(8) is pushed up. The opening υ is a movable contact equipped with a movable contact (11a), which is inserted into a holding hole (8a) formed in the crossbar (8), and is pressurized by a pressure spring I. Field 6 is the movable contact aυ, the movable contact (11
A fixed contact n is equipped with a fixed contact (15a) facing a), and this fixed contact n is connected to a terminal (1!IKm
At the same time, the aforementioned terminal a is screwed into the pace (2).
, aη.

(16b) Fi is electrically connected to the fixed contact n by the arc runner, but may be integrated with the fixed contact. 61 is a terminal screw connected to the main circuit wire.

Connected to the terminal housing. The cod is an arc box made of insulating material and is fixed to the pace (2) by screws (to). The arc box 0 is composed of a hole (19a) for discharging arced gas to the outside, a ceiling part (191)), and a side plate (19c). Qυ is a deion grid made of magnetic material, (
2) Attach the ceiling of the arc box member (19b) with the commutation electrode.
Fixed. Movable contact (11a) and fixed contact (1
3a) is located inside the arc extinguishing chamber.

Next, the opening/closing operation of this power switching device will be explained. When the main circuit shown in Fig. 1 is open, when voltage is applied to the operating coil (5), magnetic flux is generated between the fixed iron core (4) and the movable iron core (7), and the spring cannot be drawn. (1
The movable iron core (7) resists the urging force of G and the fixed iron core (4
). At this time, the crossbar (8) connected to the movable iron core (7) also operates in the same manner, and the movable contact (11a) of the movable contact ■ contacts the fixed contact (15a) of the fixed contact I, and pressurizes. A predetermined pressing force is applied by the spring 6 to close the main circuit. Next, the operation coil (
When 5) is demagnetized, the movable core (7) moves away from the fixed core (4) due to the biasing force of the tripping spring a, and the crossbar (8) moves in conjunction with the movable core (7).

Therefore, this crossbar (8) returns to the state shown in FIG. 1, and the movable contact (11a) of the movable contactor fi
and the fixed contact (IS fixed liquid d, (13a)) are separated. At the time of this separation, there is a gap between the movable contact (11a) and the fixed contact (13a) at the part indicated by A in FIG. The movement of the arc from when the arc occurs until the current is cut off will be explained using Figure 5.The arc extinguishing chamber in Figure 1 is symmetrical, so only one side of it is symmetrical. It is shown in Fig. 5. Fig. 5(a) shows the fixed contact (
13a) and the movable contact (11a) are shown in a closed state. When the fixed contact (13a) and the movable contact (11a) are opened while the operation coil (5) is energized, an arc occurs between the fixed contact (L5a) and the movable contact (11a) as shown in Fig. 5(b). (to) occurs. The contact separation distance becomes larger as time passes up to a certain distance. This arc (to) is the current flowing through the movable contact ■ and fixed contact I and the deion grid H.
According to K, the arc (
(to) o-w is a fixed contact (15) as shown in Fig. 5(d).
It is transferred from the surface of a) to the point of the arc runner (13+). Next, dielectric breakdown occurred between the tip of the arc (2) shown in FIG. 5(dl) and the part shown by B of the arc runner (13b).

One end of the arc (2) is transferred to the part indicated by B of the arc runner (+5b) shown in Fig. 5(a), and the other end of the arc (2) is transferred to the fixed contact (as shown in Fig. 5(f)). 11a)
At the same time, the arc (2) is transferred to the commutating electrode 4 and is attracted between the deion grids and extinguished. This arc extinguishing completes the interruption.

As is clear from the above switching operation mode, in the conventional power switchgear, the time required for one end of the arc (2) to transfer from the surface of the fixed contact (Lea) to the arc runner (13b), and the arc (To) The time required for the other end to transfer from the movable contact (11a) to the commutation electrode @ is reserved and extended over a considerable period of the contact opening process, that is, the arc stagnation time at each contact. each contact (11a) due to its long length.

9. (15a) has the disadvantage of severe contact wear. Shitai again. When cutting off the load current at a high switching frequency, the wear of the movable contact (11a) is further accelerated due to the temperature rise caused by the heat dissipation of the movable contact.
) had the disadvantage that it was easily broken due to thermal damage.

In addition, in the conventional power switchgear described above, FIG.
)K, an arc (to) occurs between the arc runner (13b) and the point C of the deion grid clD. ), restriking phenomenon is likely to occur along the path shown by the dotted line, which inevitably results in inferior cutting performance. ), and when frequently opened and closed, this part (19(1)) had a habit of emitting smoke and even causing perforation, causing ground faults.

In view of the above points, the present invention improves arc stagnation at each contact by modifying the related configuration of the commutating electrodes arranged oppositely in parallel on the movable contact and the arc launch extended to the fixed contact. By shortening the time, it is possible to prevent arcing along the wall of the arc box that occurs between the outermost Dia-ion grid and the tip of the arc runner, thereby improving the interrupting performance of the power switchgear and increasing its durability. This is what we are trying to do.

The invention will now be described in detail with reference to two illustrative embodiments.

Figure 6 shows the arc runner (1
5b) is shown. This arc runner (13b) consists of a bottom plate part (13b,) joined to the fixed contact 01, and a vertical plate part (15b2) extending vertically upward from the tip thereof, and the base end of the bottom plate part (13b,) An opening recess (1()) is cut out in the part, and a fixed contact (15a) is provided close to the inner depth of this recess (R). The surface height Yl of is set to be larger than the surface height xl of the fixed contact (13a).

Next, FIG. 7 shows the symmetrical right half of the commutation electrode (23).
A hollow part (M) is cut out between the inner vertical wall (N1) and the bottom wall (Q) of the U-shaped part, and the movable contact I can enter into this hollow part (MJ and move up and down). It has become.

As shown in FIG. 8, this commutation electrode (2) has a bottom wall (Q) of its U-shaped portion that allows the maximum opening of the movable contact 0 that moves up and down within the hollow portion (M). A position that overlaps between the upper surface position of the contact and the surface of the fixed contact (13a), in other words, the movable contact αυ and the movable contact (11
The outer vertical wall (N2) of the U-shaped portion is placed in a position overlapping #1 within the opening range of a), and the outer standing wall (N2) of the U-shaped portion is placed between the vertical plate portion (N2) of the arc runner (151), sandwiching the Diaion grid Qυ. 15b2).

With the above configuration, this power switchgear can operate in the manner shown in FIG. 8. That is,
Figure (a) U fixed contact (15a) and movable contact (11a)
When the operating coil (5) is energized and both contacts (11a) and (15a) are opened, an arc is generated between them as shown in Figure 8(b). death.

This contact separation distance is expanded to a predetermined range over time. Thus, the arc (2) is driven by the magnetic field created by the current flowing through the movable contact I and the fixed contact AS, and one end of the arc (2) is as shown in FIG. 8(c).
As shown in the figure, the bottom plate part (13b, ) of the arc runner (13b) located close to and above the fixed contact (15a)
Then, the other end of the arc (2) is quickly transferred from the movable contact (11a) to the U-shaped bottom wall (Q) of the commutating electrode (to) where it passes through the hollow part (M). This commutation type 1j (2)
When a magnetic material is used as the material for the arc (2)
is the current flowing through the movable contact I and the commutating electrode which is a magnetic material @
A strong magnetic field shown as B in Fig. 7 acts on the arc (2), and the arc (2) is strongly driven by the driving force 1 generated by this, and the arc (2) moves to the movable contact (11) as shown in Fig. 8 (C).
a) to be rapidly transferred by the commutating electrode (2). This arc transition is further accelerated by the driving force F and the shape and K of the transition electrode (2) described above. Next, the arc (to) is driven and extended by the magnetic field created by the current flowing through the commutating electrode and the fixed contact (13), and each end of the arc (c)
b) The bottom plate portion (13b,) tip side.

The arc is moved to the U-shaped outer standing wall (N2) of the arc and the commutation electrode (to), resulting in the state shown in FIG. ) and Ark Ranch (1
The arc passes through the state shown in Fig. 8 [e] extending in an arc shape between the vertical plate part (13b2) of sb), and is extinguished between the di-ion grids alD as shown in Fig. 8 (f), and the interruption occurs. Complete.

As described above, in the power switchgear of the second invention, the commutation electrode has a flat plate end bent into a substantially U-shape, and a notch extending between the inner vertical wall and the bottom wall of the U-shaped part. The U-shaped bottom wall has a hollow portion, and the U-shaped bottom wall is located substantially within the separation range of the movable contact and the movable contact that move up and down within the hollow portion, and the arc runner is located close to the fixed contact. It consists of a bottom plate part joined to the fixed contact and a vertical plate part standing upright on the outside of this bottom plate part and facing the outer vertical wall of the U-shaped part,
This is because the surface height of the bottom plate portion is set to be greater than the surface height of the fixed contact.

Each end of the arc generated between the fixed contact and the movable contact flows from the fixed contact to the bottom plate of the arc runner.

In addition, the arc is rapidly transferred from the movable contact to the U-shaped bottom wall of the commutating electrode, and each end of the transferred arc is driven by the magnetic field created by the current flowing through the arc runner and the commutating electrode. It is transferred at high speed to the tip side of the arc runner and commutation electrode, and reaches the Dia-ion grid at high speed.

Therefore, since the cut-off time is shortened and the arc energy is reduced, it is possible to cut off a larger current, and there is an effect that contact wear in the fixed contacts and the movable contacts can be significantly reduced.

Furthermore, according to the power switchgear of the present invention, unlike the conventional device,
Since no arc can be generated along the arc box wall between the outermost Dia-ion grid and the horizontal tip of the arc runner, a restriking phenomenon as shown by the dotted line in FIG. 5(f) will occur. This has the advantage that it has excellent breaking performance and there is no risk of damage to the shear arc box wall due to the heat radiation of the arc.

Although the above embodiments apply the present invention to a power switching device that performs switching operations using magnets, that is, an electromagnetic contactor, it is also possible to apply the present invention to circuit breakers. Needless to say.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional power switchgear, FIG. 2 is a side view of the device in FIG. 1, and FIG. 3 is a plan view of the device in FIG. 1.
FIG. 4 is a perspective view of the de-ion grid shown in FIG. 1, FIG. 5 is an explanatory diagram showing the movement of the arc in the arc extinguishing chamber of a conventional power switchgear, and FIGS. 6 to 8 are illustrations of the present invention. Fig. 6 fal, which shows a power switchgear according to an example;
(b) is a plan view and longitudinal sectional view of the arc runner,
The figure is a perspective view of the commutating electrode, and FIG. 8 is an explanatory diagram showing the movement of the arc in the arc extinguishing chamber portion of the power switchgear. nt+: Movable contact (11a): Movable contact 01
: Fixed contact (13a) : Fixed contact (i3b)
: Arc runner (131), ) : Bottom plate part (1xb2
): Vertical plate part Qυ: Diaion grid (2) Two commutation electrodes (Bound: Hollow part (N, )
: U-shaped inner standing wall (N2) : Ty-shaped outer standing wall (Ql) U-shaped bottom wall The same reference numerals in each figure indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 64 Figure 3/a Figure 1 Figure 6 Figure 7

Claims (1)

[Claims] A fixed contact joined to a fixed contact; a movable contact facing the fixed contact and joined to a movable contact;
It has a hollow part that is bent into a letter shape and cut out across the inner vertical wall and bottom wall of the U-shaped part. A movable contact whose U-shaped bottom wall moves up and down in the hollow, a commutation electrode disposed substantially within the separation range of the movable contact, and a commutating electrode disposed close to the fixed contact on the fixed contact. The bottom plate part is joined to
The vertical plate portion facing the outer vertical wall of the character-shaped portion has a vertical plate portion and an arc runner configured such that the surface height of the bottom plate portion is greater than the surface height of the fixed contact. power switchgear.