JPS5975516A - Switch - 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 switch. Note that the term "switch" used in the present invention particularly refers to a circuit breaker, a current limiter, an electromagnetic switch, etc., which generates an arc within a container, usually a small container.

In the following, a circuit breaker will be explained as an example.

Figures 1 to 3 are cross-sectional views showing conventional circuit breakers.
Each shows a different operating state.

( ]) is a cover, (2) is a base, and the cover (1) and base (2) constitute a container (3). (4) is a fixed contact, and a fixed contact (6) is attached to one end of the fixed conductor (5).
), and the other end is a terminal portion to be connected to an external conductor (not shown). (7) is a movable contact, and has a movable contact (9) at one end of its movable conductor (8) opposite to the fixed contact (6). Ql is a movable contact device, (1
1) is fixed to the crossbar (1) by a movable arm and is configured to be opened and closed at each pole interval. (II is the arc extinguishing chamber, and the arc extinguishing plate α◆ is held by the side plate (10. One end of the α force is attached to the Freddle 0 groan, and the other end is attached to one end of the lower link θ barrel, respectively.
, (2+). Note that the other end of the lower link is the movable contact device (10).
is connected to.

2) is a tilting operation handle, (21 is an operating spring,
/(a) (g) and d) are thermal and electromagnetic tripping mechanisms, respectively, and when activated, the bimetal (e) and movable iron core (4) rotate the retrieval bar) counterclockwise.

1) is a latch whose one end is locked to the trip bar (c) and the other end is locked to the credo fi/(19).

Credo/l/ (11) is the latch (if you tilt the operating hand iv@ to the closing position with it locked to the ground, the thorn μ link mechanism (If) will extend and the axis Q) will be locked to the credo μα groan. The movable contact (9) is joined to the fixed contact (6). This state is shown in FIG. Next, when the operating hand /l/ (foundation) is brought to the open position, the spine link mechanism (α) bends and opens the movable contact (9) from the fixed contact (6), opening the movable arm 0.
No is locked to the fredl shaft). This state is shown in FIG.

Furthermore, if an overcurrent flows through the circuit in the closed state shown in Fig. 1, the thermal tripping mechanism (g) or electromagnetic tripping mechanism) will operate, causing the credo/l10se and latch (2) to operate.
is disengaged, the Freddle α rotates in the direction of the hour hand around the Freddle shaft), and is locked to the Nutotsubar shaft 0]). Due to the spring force of the Freddle θ field and the upper link (the connecting point of the gong exceeds the line of action of the above-mentioned operating spring (A), it becomes the operating spring), the thorn μ link mechanism α bends, and the crossbar (Ll
Automatic shutoff is performed in conjunction with each coffin.

This state is shown in FIG.

Next, the twist angle of the arc that occurs when the circuit breaker interrupts the current will be explained.

Now, when the movable contact (9) and the fixed contact (6) are in contact, the power is transferred from the power supply side to the fixed conductor (5).
), fixed contact (6), movable contact (9) and movable conductor (
8) and is sequentially supplied to the load side. In this state, when a large current such as a short circuit current flows through this circuit, the movable contact (9) is separated from the fixed contact (6) as described above. At this time, the fixed and movable contacts (6),
An arc () is generated between the fixed and movable contacts (6) and (9), and an arc voltage is generated between the fixed and movable contacts (6) and (9). This arc voltage increases as the separation distance of the movable contact (9) from the fixed contact (6) increases, and at the same time
The arc-extinguishing plate α is attracted by the magnetic force and extends in the direction of the arc-extinguishing plate α, so it further rises. In this way, the arc current reaches a current zero point, the arc is extinguished, and the interruption is completed. 'A circuit breaker and its internal components operate as described above when disconnecting, but the performance that a circuit breaker that operates in this way must have is a high arc voltage; Depending on the height of the arc voltage, the arc current flowing during the circuit breaker operation will be suppressed and the magnitude of the current flowing through the circuit breaker will be reduced. Therefore, circuit breakers that produce high arcing voltages are
It has high protection performance for various electrical equipment including distribution lines arranged in series with circuit breakers, and expands new areas of selective coordination or simultaneous switching between circuit breakers connected in series. become.

In response to such demands, conventional circuit breakers of this type have either a movable electric contact (4) that is opened and opened at high speed, or an arc (8) It has been attempted to elongate the arc using magnetic force, but these methods had the disadvantage that there was a certain limit to the increase in the arc voltage, making it impossible to obtain a satisfactory result. .

This invention overcomes the limitations of conventional circuit breakers with respect to increases in arc voltage, and significantly increases arc voltage by increasing the amount of contact particles generated between contacts injected into the arc space. In order to achieve this purpose, the size of the foot of the arc generated at the contact is limited, and the radial direction of the contact particles generated by the arc is For the purpose of limiting the arc, the conductor around the contact point where the arc occurs is coated with a pressure reflector, and the side plate of the arc extinguishing plate is made of an inorganic insulator, which has excellent current limiting performance and reduces the pressure inside the container. The purpose of this invention is to provide a switch that can suppress this.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows an example of a circuit breaker applied to a switch according to the present invention, and the same parts as in FIGS. 1 to 3 are given the same reference numerals and the explanation thereof will be omitted.

In the figure, (10i) and (102) are the conductors (5) around the fixed contact (6) and the movable contact (9),
The pressure reflectors (101) are formed on the conductor (5) and (8) so as to cover the conductor (5) (see Fig. 5), and αo is the conductor (5), (8)
It is also made of high resistance material with high resistivity.

The high-resistance materials include organic or inorganic insulators or high-resistance metals such as nickel, iron, copper-nickel, copper-manganese, copper-manganin, iron-carbon, iron-nickel μ, and iron-chromium.

The pressure reflectors Qot) and (102) are made by coating the conductors (5) and (8) with the above-mentioned high-resistance material, such as ceramic, by plasma jet spraying or the like, or made of the above-mentioned high-resistance material. It can be easily formed by fixing plate-shaped objects to the conductors (5) and (8).

According to the above-mentioned covering means, not only can it be easily formed, but also
It is inexpensive, and the increase in weight is suppressed, especially on the movable contact (7) side, so the moment of inertia is reduced, the opening speed of the movable contact (7>) is increased, and the arc voltage can therefore be increased. There are advantages.

On the other hand, the side plate 09 that supports the arc-extinguishing plate 0→ is made of an inorganic insulating material, such as ceramic or ceramics.

Next, the operation of the above configuration will be explained.

The arc (b) generated between the fixed and movable contacts (6) and (9) is the same as in the conventional one, but
) , (9) around the pressure reflector α01) , (1
Since there is 02), the arc) is injected into a narrow space. For this reason, the cross-sectional area of the arc) is significantly smaller than that without a pressure reflector υ, so the arc voltage increases significantly compared to the conventional one, and the current limiting performance can be improved. If the side plate OQ holding the arc extinguishing plate a4 is made of an organic insulator that is commonly used in the past, the #fr area of the arc (to) can be reduced as described above.
In this case, the side plates become hot and wear out due to the local heat of the arc inserted into them.

The amount of wear and tear will be significantly greater than that of a conventional device that does not have a pressure reflector. In addition, since the insulating particles are scattered into the container (3) due to the wear of the side plate Q~, the pressure inside the container (3) is also high, and the cover (1) and base (
2) may be destroyed.

However, in the above structure, since the side plates ( ) are made of an inorganic insulating material, the above-mentioned fear can be eliminated. Even if the arc (to) squeezed by the clamp pressure reflector (QOI), (102) touches the side plate (to), the side plate Q~ will not be consumed, and therefore the pressure inside the container (3) will be reduced. The rise is suppressed and therefore base (1) and cover (2)
Destruction is reliably prevented.

FIG. 6 shows a modification of the fixed electrical contact (4) provided with a pressure reflector (101). The pressure reflector (1
01), the direction away from the tip (6a) of the fixed contact (6), for example, in this example, the arc traveling direction (direction of arrow a) is forward, toward the side of the tab arc extinguishing plate α. An arc running path α03) consisting of a groove is formed.

If this is done, the legs of the arc (c) will run on the arc travel path α03) and will be more likely to turn toward the arc extinguishing plate O→ side. Therefore, the arc) does not easily touch the arc-extinguishing plate α, and the breaking performance in the small current range can be improved.

As described above, according to the present invention, by providing a pressure reflector on the electric contact and composing the side plate supporting the arc extinguishing plate with an inorganic insulator, it is possible to achieve excellent current limiting performance and reduce the internal pressure of the container. It is possible to provide a switch that can be suppressed as much as possible.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views showing conventional circuit breakers.
Each indicates a different operating state. FIG. 4 is a sectional view showing an example of a circuit breaker applied to a switch according to the present invention, FIG. 5 is a perspective view of a fixed electric contact of the circuit breaker, and FIG. 6 is a perspective view of a fixed electric contact of the circuit breaker. It is a perspective view showing a modification. (Container, (4) Fixed electrical contact, (5)
...Fixed conductor, (6)...Fixed contact, (7)...
Movable electric contact, (8)...Movable conductor, (9)...
Movable contact, (14... arc extinguishing plate, 0 o'clock... side plate, (1
01), (102)...pressure reflector, α03)...
・Arc running path, a... Arc running direction. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) tttz Ltn IJb 9 5th 5N

Claims (2)

[Claims] (1) at least one pair of electrical contacts configured with a conductor and contacts fixed thereto and operating to open and close within the container; An arc-extinguishing plate for extinguishing an arc, and a pair of side plates supporting both ends of the arc-extinguishing plate (17 feet in length, the above-mentioned conductor is also made of a high-resistance material with high resistivity, and the above-mentioned A switch in which a pressure reflector covering a conductor around the contact is formed on the electric contact, and each of the side plates is made of an inorganic insulating material. (2) a pressure reflector of at least one electrical contact;
2. The switch according to claim 1, further comprising an arc travel path that extends from the contact point toward the front in the arc travel direction and is highly conductive than the pressure reflector.