JPS58117613A - 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.

FIGS. 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) K has a plurality of mounting holes (
1a) is provided. (2) is a pace made of insulating material, and 1 and (4) are fixed iron cores made of laminated silicon copper plates, which are fixed by the mounting base (1) and screws (3). (4) K is equipped with an operating coil (5), and a leaf spring (6) is provided as a buffer material in the gap with the mounting base (11). (7) is connected to the fixed core (4). The movable cores are arranged opposite to each other and are configured to attract the fixed core (4) when the operating coil (5) is energized.(8) is a cross bar made of an insulating material. - is connected to the movable iron core (7) via a pin (9).6 is a trip spring disposed between this crossbar (8) and the mounting base (1), and is is the crossbar (
8) is being pushed up. Reference numeral I designates a movable contactor having a movable contact (11a), which is inserted into a holding hole (8a) provided in the crossbar (8) and is pressurized by a pressure spring al. I is the above movable contact 6υ, movable contact (11a)
A fixed contact including a fixed contact (13a) facing the
This fixed contact ring is connected to a terminal (19K (support)) using screw 04.
At the same time, the terminal α field is
, A is fixed.

(1sb) is an arc runner and is electrically connected to the fixed contact n, but it is preferable to integrate it with the fixed contact I.

The cod is connected to the main circuit mold clamp with a terminal screw.

-Ql, which is connected to the terminal a, is an arc box made of an insulating material, and is fixed to the base (2) K with OIK screws. The arc box consists of a hole (19a) for discharging arced gas to the outside, a ceiling part (191)), and a side plate (19c). aυ is 17 in the shape shown in Fig. 4, and is a deion grid made of magnetic material.
9b). The movable contact (11a) and the fixed contact (15a) are arranged within the arc extinguishing chamber.

Next, the opening/closing operation of this power switching device will be explained. When the main circuit shown in Figure 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 (), and the trip is prevented. al
The movable core (7) is moved against the fixed core (4) against the biasing force of
). 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 I comes into contact with the fixed contact (13a) of the fixed contactor, and the pressure is applied. A predetermined pressing force is applied by the spring 03 to close the main circuit. Next, the operation coil (
5), the movable core (7) moves away from the fixed core (4) due to the biasing force of the tripping spring att, and the crossbar (8) also 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 contact 0υ
and the fixed contact (13a) of the fixed contact I are separated. During this separation, the movable contact (11a) and the fixed contact (1
3a), an arc is generated at the portion indicated by A in FIG. The movement of the arc from the time 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 shown in Figure 5. has been done. FIG. 5(a) shows a state in which the fixed contact (13a) and the movable contact (11a) are closed and in good condition. Operation coil (
5), the fixed contact (13a) and the movable contact (1
When 1a) is opened, the fixed contact (13a) and the movable contact (11a)
), an arc (2) is generated as shown in FIG. 5(b). The contact separation distance increases with time up to a certain distance l#. This arc (to) is the current flowing through the movable contact α0 and the fixed contact (I:1) and the deion grid c
5 (C1), one end of the arc is transferred from the surface of the fixed contact (15a) to point A of the arc runner (15b) as shown in Figure 5 (d). Next, dielectric breakdown occurs between the tip of the arc (to) shown in FIG. 5(d) and the part shown by B of the arc runner (i!Ib).

One end of the γ-ri (to) is transferred to the part indicated by B of the arc launch (13b) shown in Fig. 5(e), and the other end of the arc (to) is fixed as shown in Fig. 5(fl). Contact (11a)
At the same time, the arc device is attracted between the de-ion grid r2υ and extinguished. This arc extinguishing completes the interruption.

As is clear from the above opening/closing operation mode, in the conventional power switchgear, as shown in FIG. 5(f), the arc runner (15b) and the point C
Since an arc (c) is generated between the
) The restriking phenomenon is likely to occur along the path shown by the dotted line, which inevitably leads to inferior cutting performance.Moreover, the above-mentioned arc @ causes the portion of the arc box member near the arc (19d) to heat up due to its heat. .

When frequently opened and closed, this part (19d) has a habit of causing smoke and even perforation, causing ground faults.

The present invention was made in view of the above-mentioned problem.

A second commutation w pole is erected on the fixed contact facing the Diaion grid and electrically connected to the fixed contact with a space between it and the tip of the arc runner. The purpose is to improve the disconnection performance and durability of a power switchgear by preventing the generation of arcs along the arc box wall between the tip of the arc runner and the outermost Diaion grid.

Hereinafter, the present invention will be described with reference to the embodiment shown in FIG. 6. As is clear from the figure, in the above-mentioned conventional arc extinguishing chamber configuration, the second commutating electrode (15c) is connected to the fixed contact Os. The commutation electrode (13c) is electrically connected to the base side of the arc runner (1sb).
) is spaced apart from the tip of the above Diaion Grid Q.
It is provided so as to extend to a position facing υ.

According to the above configuration, the operating modes shown in (a) to (f) of the figure can be adopted. In other words, Figure (a) shows the closed circuit state between the fixed contact (13a) and the movable contact (11a), and when both contacts (11a) and (13a) are opened by the bias of the operation coil (5), these contacts In between, an arc (to) is generated as shown in Fig. 6 (bl), and this contact separation distance is expanded to a predetermined range with the passage of time.Thus, the arc (2) (111 and the fixed contact (11) and the di-ion grid Qυ drive and expand as shown in FIG. 6(C). At this time, the high temperature gas heated and ionized by the arc (2) Although the flow is in the direction of the arrow in Fig. 6(c), the tip of the arc 27 (13b) (
Since electric field concentration occurs at point C in Fig. 6(c), dielectric breakdown occurs between part C of the arc (to) and the tip of the arc runner, and one end of the arc (to) figure(
As shown in d), it is rapidly transferred to part A in the same figure. Next, part C of the arc (to) in this FIG. 6(d)
Dielectric breakdown occurs between the electrode and the part B of the second commutating electrode (15c), and the arc (2) is extended along the lower edge of the grid Qυ as shown in FIG. 6(e). As shown in Figure (f), the arc is extinguished between the di-ion grids 3υ.

As is clear from the above, in this power switchgear, as in the conventional power switchgear described above, the point B of the arc runner (13b) in FIG. The arc (c) that had occurred in the meantime is not seen to occur at all at the corresponding location in FIG. 8(f). Once upon a time, an arc (
c) Once the arc is extinguished, the conventional

The restriking phenomenon that had occurred along the path shown by the dotted line in FIG. 5(f) can be prevented, and the arc t
Since B is acceleratedly driven to the di-ion grid Qυ, excellent breaking performance can be exhibited.

In addition, in this power switchgear, the above-mentioned Fig. 5 (
Since the arc that had occurred between point B of the arc runner (13b) in f) and point C of the Dia-ion grid Q is not generated, the heat of this arc causes the near-arc part of the arc box OI (19 (1) Therefore, even if it is opened and closed frequently, the arc proximal part (19
There is no risk that d) will cause smoke or ground fault accidents due to perforation.

As described above, according to the present invention, the provision of the second commutation electrode has the effect of improving both the interrupting performance and the durability of the power switchgear.

Although the above embodiment applies the present invention to a power switching device that performs switching operations using a magnet, that is, an electromagnetic contactor, the present invention can also be applied to a circuit breaker. 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.
Figure 4 is a perspective view of the Diaion grid in Figure 1;
The figure is an explanatory diagram showing the movement of an arc entering the arc extinguishing chamber of a conventional power switchgear. FIG. 6 is an explanatory diagram showing the configuration of the arc extinguishing chamber and the movement of the arc in the power switchgear according to the embodiment of the present invention. ! lυ: Movable contact (11a): Movable contact a
:4=Fixed contact (15a) :Fixed contact (1
sb): Arc runner (13c): Second commutation electrode 2+1: Diaion grid ■: Commutation 1! Note that the same reference numerals in the two figures indicate the same or corresponding parts. Agent Kuzufu-ryo - 1st rlA Figure 3 1α 1ξ Figure 4 j16

Claims (1)

[Claims] A fixed contact joined to a fixed contact, a movable contact facing the fixed contact and joined to a movable contact, a commutating electrode arranged in parallel above the movable contact, and a commutating electrode arranged on the side of the commutating electrode. A di-ion grid is disposed along the opening direction of the movable contact and extinguishes an arc generated between the two contacts, and an arc runner is provided on the fixed contact and electrically connected to the fixed contact. , wherein a second commutation electrode electrically connected to the fixed contact is disposed in an upright position facing the grid and with a space between it and the tip of the arc runner. Switchgear.