JP7102064B2 - Breaker - Google Patents

Description

The present invention relates to a breaking device.

As described in Patent Document 1, it is known that a semiconductor is used to extinguish an arc generated at a contact. Such an arc extinguishing method is also used in a circuit having two contacts. In this case, an arc-free circuit composed of semiconductor elements is connected so as to be juxtaposed with one contact, and an arc generated when the contacts are opened is semiconductor. The structure is such that it is transferred to the element.

Japanese Unexamined Patent Publication No. 8-106839

By the way, when a cutoff device 100 having a plurality of poles of the first contact 111 and a second contact 121 is used as in the switch shown in FIG. 9, a DC power supply is supplied to the input side terminal 100a of the cutoff device 100. No. 6, the load 7 is connected to the output side terminal 100b.
The breaking device 100 is formed so that the contacts 111 and 121 are interlocked with the operation of the handle 200 formed on the housing so that the handles 200 can be operated to open and close the contacts 111 and 121. Has been done. When the shutoff device 100 is energized, if the handle 200 is operated to open the contacts 111 and 121, an arc is generated. In order to extinguish this arc, it is necessary to operate so that the first contact 111 to which the non-arc circuit 131 is connected is opened first, and then the second contact 121 is opened by the operation of the movable contact 121a. There is. On the other hand, when the structure is such that the first contact 111 connected to the handle 200 is opened before the second contact 121 when the contact of the breaking device 100 is opened, the contact of the breaking device 100 is closed. Occasionally, the second contact 121 closes first, and then the first contact 111 forming the arc-free circuit 131 closes later. In this case, as shown in FIG. 9A, the second contact 121 is closed first, so that a potential difference is generated between the abs at both ends of the first contact 111 forming the arc-free circuit 131. .. In this state, as shown in FIG. 9B, when the contact "bound" or "rubbing" occurs when the first contact 111 is closed from the open state, it is turned ON / OFF in a short time. Repeated chattering occurs. When chattering occurs, as shown in FIG. 10, noise may momentarily enter a high voltage, apply a voltage equal to or higher than the rated voltage to the semiconductor element of the non-arc circuit 131, and destroy the semiconductor element.

The inventor of this case tried to solve this problem by diligently examining this point. An object of the present invention is to prevent noise from entering the semiconductor elements juxtaposed with the contacts when the pole is closed.

In order to solve the above problem, between the first contact connected between the first input side terminal and the first load side terminal, and between the second input side terminal and the second load side terminal. It is a breaking device equipped with a second contact connected and a non-arc circuit that can be extinguished by commutating an arc generated at the time of opening to a semiconductor element at the first contact. Therefore, when the pole is closed, the breaking device is used to close the first contact before the second contact.

Further, it is preferable that a mechanism portion for operating the movable contact provided at each contact is provided independently for each contact, and each mechanism portion can be operated independently.

Further, it is preferable that the control unit individually controls the operation of each mechanism unit.

According to the present invention, it is possible to prevent noise from entering the semiconductor elements arranged side by side with the contacts when the pole is closed.

It is a figure which showed the state which the 1st contact and the 2nd contact were open in the switch provided between a DC power source and a load. It is a figure which showed the state which the 1st contact was closed and the 2nd contact was opened in the switch provided between a DC power source and a load. It is a figure which showed the state which the 1st contact and the 2nd contact were closed in the switch provided between a DC power source and a load. It is a figure which showed the relationship between the timing of closing the 1st contact and the 2nd contact, and the voltage between ab. It is a figure which shows the way of moving the 1st movable contact and the 2nd movable contact at the time of closing a pole. However, (a) shows the state where the first movable contact and the second movable contact are open, and (b) shows the state where the first movable contact is closed and the second movable contact is open. Shown, (c) shows a state in which the first movable contactor and the second movable contactor are closed. It is a figure which shows the way of moving the 1st movable contact and the 2nd movable contact at the time of opening a pole. However, (d) indicates that the first movable contact and the second movable contact are closed, and (e) indicates that the first movable contact is open and the second movable contact is closed. Shown, (f) shows the state in which the first movable contactor and the second movable contactor are open. It is a perspective view of the switch which connected the operation part. It is a perspective view of the switch with the mechanism part operation piece. It is a figure which showed the operation method which closes the 1st contact from the state which the 1st contact is opened and the 2nd contact is closed in the switch provided between a DC power source and a load. It is a figure which showed the relationship between the closing timing of the 1st contact and the 2nd contact shown in FIG. 9 and the voltage between ab.

A mode for carrying out the invention is shown below. The breaking device 1 of the present embodiment has a first contact 11 connected between the first input side terminal 1a (1a-1) and the first load side terminal 1b (1b-1), and a second contact. It is provided with a second contact 21 connected between the input side terminal 1a (1a-2) and the second load side terminal 1b (1b-2). Further, an arc-free circuit 31 that can be extinguished by commutating an arc generated at the time of opening to a semiconductor element is arranged side by side at the first contact 11 of the breaking device 1. Further, the breaking device 1 closes the first contact 11 before the second contact 21 when the pole is closed. Therefore, it is possible to prevent noise from entering the semiconductor elements arranged side by side with the first contact 11 when the pole is closed.

In the embodiment, the blocking device 1 will be described as a switch. In this embodiment, the switch is arranged between the DC power supply 6 and the load 7. Specifically, the DC power supply 6 is connected between the input side terminals 1a-1 and 1a-2 of the cutoff device 1, and the load 7 is connected between the output side terminals 1b-1 and 1b-2. This switch has two contacts having a plurality of poles inside, and an arc-free circuit 31 is provided so as to be parallel to the first contact 11. The arc-free circuit 31 is provided with a semiconductor element, and can extinguish the arc that has been commutated by controlling the semiconductor element. A metal oxide semiconductor field effect transistor or the like may be used as the semiconductor element.

In the present embodiment, when changing from a state in which a current does not flow through the load 7 to a state in which a current flows through the load 7, the handle 200 formed on the surface of the switch is operated, and each contact is shown in the state shown in FIG. After the state shown in 2, the state shown in FIG. 3 is obtained. That is, when the first contact 11 and the second contact 21 are opened and then closed, the first contact 11 is closed by the operation of the movable contact 11a, and then the movable contact 21a is operated. Close the second contact 21. By doing so, it is possible to prevent a potential difference from occurring between the abs at both ends of the first contact 11, so that there is no possibility that noise due to chattering will enter the arc-free circuit 31 side when the pole is closed (see FIG. 4). Then, when the load 7 is opened from the state in which the current flows, the first contact 11 is opened first by the operation of the movable contact 11a, and the arc generated when the contact is opened is commutated to the arc-free circuit 31. After extinguishing the arc, the second contact 22 is opened by the operation of the movable contact 21a. As a result, it is possible to prevent each contact from being deteriorated by the arc. In the examples shown in FIGS. 1 to 3, mechanical parts for operating the movable contacts provided at each contact are provided independently for each contact in conjunction with the operation of the handle 200, and each mechanical part is independent. It is possible to operate. More specifically, the first mechanical unit 14 can operate the first movable contact 12 of the first contact 11, and the first mechanical unit 14 is provided independently of the first mechanical unit 14. The second movable contact 22 of the second contact 21 can be operated by the second mechanical unit 24. In this way, since the first mechanical portion 14 and the second mechanical portion 24 are formed independently, the first contact 11 can be closed first when the pole is closed, and the first contact 11 can be opened first when the pole is opened. It is possible to be extreme.

Various means can be considered for moving the first contact 11 and the second contact 21 in this way, and an example thereof will be described below. In the example shown in FIG. 5, the opening of each contact is controlled by a mechanical operation, and the first movable contact 12 provided on the first contact 11 and the second contact 21 are provided. The second movable contact 22 can be closed at different timings. In the present embodiment, the first movable contact 12 can be connected to the first fixed contact 13 by moving the first operated piece 16, and the second by moving the second operated piece 26. Movable contact 22 can be connected to a second fixed contact (not shown).

The first piece to be operated 16 and the second piece to be operated 26 are provided independently and can operate independently, but these are provided by a rotation mechanism unit 32 interlocked with the operation of a handle (not shown). Be manipulated. In the present embodiment, the first operation piece 15 and the second operation piece 25 are provided so as to protrude from the rotation shaft of the rotatable rotation mechanism unit 32. The first operation piece 15 and the second operation piece 25 are provided so that their protruding directions deviate from each other. By rotating one rotation mechanism unit 32, the first operation piece 16 and the second operation piece 16 and the second operation piece 25 are rotated. Both of the two operated pieces 26 can be moved in order.

At this time, the first movable contact 12 is rotated by the first sliding mechanism portion 17 pushed up by moving the first piece 16 to be operated. Further, the second movable contact 22 is rotated by the second sliding mechanism portion 27 pushed up by moving the second operated piece 26. In the embodiment, in order to prevent excessive contact pressure from being applied to the first fixed contactor 13, a pressure contact spring 33 is installed so that the force received from the rotation mechanism portion 32 can be absorbed.

In the present embodiment, the first contact 11 is opened before the second contact 21 when the pole is opened with a handle (not shown). When the rotation mechanism portion 32 shown in FIG. 5 is rotated in the direction opposite to that at the time of closing the pole, the first contact 11 is opened after the second contact 21. Therefore, in the example shown in FIG. 6, the rotation mechanism portion 32 is configured to be able to move straight when the pole is opened by the handle. By moving the rotation mechanism unit 32 in a straight line, the state of supporting the first piece to be operated 16 can be released and then the state of supporting the second piece to be operated 26 can be released. In the present embodiment, the protruding length of the first operated piece 16 is shorter than the protruding length of the second operated piece 26, and the first contact 11 is shorter than the second contact 21. I try to make it easier to open first.

By the way, when the mechanism for operating the movable contact provided at each contact is provided independently for each contact, it is possible to make each mechanism independently operable by various methods. Is. In the examples shown in FIGS. 7 and 8, each contact is opened by communication control, and a mechanism operation piece 34 for operating the mechanism is provided. Further, a control unit 35 is connected to the switch. The control unit 35 can individually control the operation of each mechanism unit. More specifically, the control unit 35 enables the mechanism unit operation piece 34 to be operated so as to individually control the operation of each mechanism unit. In the examples shown in FIGS. 7 and 8, a plurality of control units 35 are provided, and the control units 35 communicate with each other, and when the pole is closed, the first contact 11 is closed before the second contact 21. At the time of opening the pole, the first contact 11 is controlled to be opened before the second contact 21. In the examples shown in FIGS. 7 and 8, the first contact 11 and the second contact 21 are formed in separate switches, and the control unit 35 is connected to each switch. A plurality of contacts may be provided in the switch, or may be formed in separate switches.

Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be in various modes. For example, the circuit breaker can be a breaker instead of a switch.

It is also possible to have three or more contacts instead of two. In this case, the first contact may be closed first when the pole is closed. Further, it is preferable that the first contact is opened last when the pole is opened.

1 Breaking device 11 First contact 12 First movable contact 14 First mechanism 21 Second contact 22 Second movable contact 24 Second mechanism 31 No arc circuit 35 Control unit

Claims (3)

The first contact connected between the first input side terminal and the first load side terminal,
The second contact connected between the second input side terminal and the second load side terminal,
Equipped with
At the first contact, a breaker in which an arc-free circuit that can be extinguished by commutating an arc generated at the time of opening to a semiconductor element is arranged side by side.
When changing from a state in which no current is flowing to a state in which current is flowing due to closed poles, the first contact is closed before the second contact.
When changing from a state in which current is flowing to a state in which current is not flowing by opening the pole, the first contact is opened before the second contact, and the arc generated when the contact is opened is commutated to a non-arc circuit to extinguish the arc. A shut-off device that opens the second contact . A mechanism for operating the movable contacts provided at each contact is provided independently for each contact.
The blocking device according to claim 1, wherein each mechanical unit can operate independently. The shutoff device according to claim 2, wherein the control unit individually controls the operation of each mechanism unit.

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