JP2001067996A - Breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and low-cost breaker of a thermal-mechanical puffer combined type. SOLUTION: A first heating chamber 6, which is arranged in a movable contact in a breaker for increasing the pressure of gas therein with the heat of an arc and then blowing it to the arc, and a second heating chamber 7 having similar function are arranged between the movable contact 3 and a case 1. The weight of the movable contact 3 is reduced with the reduced volume of the first heating chamber 6 in the movable contact 3, resulting in an operating device reduced in output and the breaker having smaller and low-cost connecting mechanism and operating device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power circuit breaker installed in, for example, a substation or a switchyard.

[0002]

2. Description of the Related Art Conventionally, in the arc extinguishing chamber of a power circuit breaker, a mechanical puffer type in which an arc-extinguishing gas is compressed and blown to an arc by a mechanical operating force has been mainly used. In addition, a method has been put into practical use in which a gas is pressurized by the heat of the arc and a heat puffer type for blowing the arc is also used.

[0003] A conventional circuit breaker will be described with reference to the drawings. 3 and 4 show, for example, Japanese Patent Publication No. 7-1097.
It is a figure which shows the cross-section of the closed state of the conventional circuit breaker shown in No. 44 gazette state.

The arc extinguishing chamber combined with heat puffer and mechanical puffer is, for example, as shown in FIG. 3 and FIG.
A fixed contact 2 fixed to one end of the container 1 and driven by an operating device (not shown) in a container 1 filled with an arc-extinguishing gas such as F ₆ gas, can be linearly moved and come and go with the fixed contact 2. Movable contacts 3 arranged like this
It is composed of

[0005] A fixed arc contact 9 is arranged at the tip of the fixed contact 2, and the movable contact 3 is a movable arc contact 1.
0, a heating chamber 4 and a compression chamber 5.

The movable arc contact 10 is a fixed arc contact 9
And is configured to move linearly while being electrically connected to and separated from. The heating chamber 4 is disposed between the movable arc contact 10 and the compression chamber 5, and performs a linear motion with the movable arc contact 10. The compression chamber 5 includes a movable arc contact 10 and a heating chamber 4.
And a piston 12 fixed to the container 1 so that the volume of the compression chamber 5 is reduced and the internal gas is compressed when the movable contact 3 is shut off.

The heating chamber 4 has two openings, a communication port 17 to the tip of the movable arc contact 10 and a communication port 18 to the compression chamber 5. Communication port 1 between heating chamber 4 and compression chamber 5
8 is provided with a check valve 13, which is opened when the pressure in the compression chamber 5 becomes higher than the pressure in the heating chamber 4, and gas flows from the compression chamber 5 to the heating chamber 4. When the pressure becomes higher than the pressure in the compression chamber 5, the structure is closed to block the gas flow from the heating chamber 4 to the compression chamber 5.

Further, a check valve 14 and a control valve 15 are provided in the compression chamber 5. The check valve 14 opens when the pressure in the compression chamber 5 becomes lower than the external pressure during the charging operation, and allows the gas to flow into the compression chamber 5 from the outside to make the compression chamber 5 a negative pressure. Is preventing. The control valve 15 opens when the pressure in the compression chamber 5 reaches a certain pressure or more during the shut-off operation, causes the gas in the compression chamber 5 to flow out, and controls that the pressure in the compression chamber 5 becomes too high. ing.

At the time of energization, as shown in FIG. 3, the fixed contact 2 and the movable contact 3 make electrical contact, and a current flows between the contacts.

On the other hand, at the time of current interruption, as shown in FIG. 4, the movable contact 3 moves on a straight line and separates from the fixed contact 2 so that the fixed arc contact 9 and the movable arc contact 10 are moved.
An arc is generated between them. When the breaking current is large, the gas temperature in the heating chamber 4 rises due to the heat of the arc, and at the same time, the pressure in the heating chamber 4 rises. The pressure in the heating chamber 4 is
When the pressure is higher than the pressure of the gas compressed in the above, the check valve 13 between the two is closed, and the high-pressure gas in the heating chamber 4 is
The arc is blown to the arc between the fixed and movable arc contacts through the communication port 17 to interrupt the current.

When the breaking current is small, the temperature rise of the heating chamber 4 due to the arc is small, and the pressure of the compression chamber 5 in which the gas inside is compressed by the breaking operation becomes higher than the pressure of the heating chamber 4. For this reason, the check valve 13 between the heating chamber 4 and the compression chamber 5 is opened, and the high-pressure gas in the compression chamber 5 is supplied to the fixed arc contact 9 and the movable arc contact 10 through the heating chamber 4 and the communication port 17. It is blown against the arc in between to interrupt the current.

[0012]

In the conventional circuit breaker as described above, the breaking performance is determined by the volumes of the heating chamber 4 and the compression chamber 5. On the other hand, since the weight of the movable contact 3 is determined by the volumes of the heating chamber 4 and the compression chamber 5, it is difficult to reduce the total weight of the movable contact 3 without changing the volumes of the heating chamber 4 and the compression chamber 5. is there. As a result, there is a problem that there is a limit in reducing the operating force of the operating device, that is, reducing the size, cost, and noise of the operating device.

The present invention has been made in order to solve the above-mentioned problems, and has as its object to obtain a circuit breaker that can reduce operating force, can be made compact and inexpensive, and can reduce noise. I do.

[0014]

According to a first aspect of the present invention, there is provided a circuit breaker having a fixed contact fixed to one end of a container in a container filled with an arc-extinguishing gas, and electrically connected to the fixed contact. A movable contact that moves in a straight line so that it can be separated and moved, and the gas inside is heated by the arc when shutting off, and the gas stored under high pressure blows out the arc when interrupting a very large current In a circuit breaker including a heating chamber and a compression chamber in the movable contact, in which the gas inside is compressed at the time of shutoff to blow out the arc, the heating chamber is a third chamber disposed in the movable section. The first heating chamber is divided into a first heating chamber and a second heating chamber disposed in the non-movable portion and communicating with the first heating chamber.

In the circuit breaker according to a second aspect of the present invention, the first heating chamber is fixed to the movable contact, the second heating chamber is fixed to the vessel, and the first heating chamber is fixed to the movable contact. And the second heating chamber are always in communication regardless of the opening / closing operation of the movable contact.

According to a third aspect of the present invention, in the circuit breaker, the first heating chamber includes a space provided inside the movable contact and communicates with the compression chamber.
Is constituted by a space between an outer wall of the movable contact and a case fixed to the container.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A circuit breaker according to Embodiment 1 of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are cross-sectional views of a circuit breaker according to Embodiment 1 of the present invention in a closed state and a closed state. In the drawings, the same reference numerals indicate the same or corresponding parts.

In the arc-extinguishing chamber of the circuit breaker according to the first embodiment, the heating chamber is divided into two sections. One is fixed to the container. There is a gas communication portion between the two heating chambers, and the gas communication portion is always in communication regardless of the opening / closing operation of the movable contact.

By connecting the two heating chambers, the mass of the movable part can be reduced, and therefore the output of the operating device for driving the movable part can be reduced, so that the circuit breaker as a whole can be reduced in size, cost and noise. .

As shown in FIGS. 1 and 2, the arc-extinguishing chamber of the circuit breaker includes a fixed contact 2 fixed to one end of a container 1 and an operating device (not shown) in a container 1 filled with an arc-extinguishing gas. The movable contact 3 is arranged so as to be linearly moved so as to be able to contact and separate from the fixed contact 2, and a case 16 fixed to the container 1 and slidably in contact with the outer wall of the movable contact 3. I have.

A fixed arc contact 9 is arranged at the tip of the fixed contact 2, and the movable contact 3 is a movable arc contact 1.
0, a first heating chamber 6 and a compression chamber 5.
The movable arc contact 10 is configured to electrically move toward and away from the fixed arc contact 9 and move linearly.
The first heating chamber 6 is disposed between the movable arc contact 10 and the compression chamber 5 and performs a linear motion together with the movable arc contact 10. The compression chamber 5 includes a movable arc contact 10 and a first heating chamber 6.
And a piston 12 fixed to the container 1, and is configured to compress the gas inside while the movable contact 3 is shut off.

On the other hand, a second heating chamber 7 is formed outside the movable contact 3 by the movable contact 3 and the case 16. The case 16 is in slidable contact with the outer wall of the movable contact 3, and when the movable contact 3 is in the closing position and the blocking position,
Also in the process of performing the shut-off operation, the second heating chamber 7 is always formed.

The first heating chamber 6 has a communication port 17 to the tip of the movable arc contact 10, a communication port 18 to the compression chamber 5, and a communication port 8 to the second heating chamber 7. It has three openings.

A communication port 1 between the compression chamber 5 and the first heating chamber 6
8 is provided with a check valve 13, which is opened when the pressure in the compression chamber 5 becomes higher than the pressure in the first heating chamber 6, and gas flows from the compression chamber 5 to the first heating chamber 6, Conversely, when the pressure in the first heating chamber 6 becomes higher than the pressure in the compression chamber 5, the first heating chamber 6 is closed to block the gas flow from the first heating chamber 6 to the compression chamber 5.

The communication port 8 between the first heating chamber 6 and the second heating chamber 7 is always connected to the first heating chamber 6 and the second heating chamber regardless of whether the movable contact 3 is turned on or off. It is configured so that gas can flow back and forth between 7. The communication port 8 also ensures that the pressures in the first heating chamber 6 and the second heating chamber 7 are always equal during the process of opening and closing the contacts.
The heating chamber is large enough to be regarded as one heating chamber.

The compression chamber 5 is provided with a check valve 14 and a control valve 15. The check valve 14 opens when the pressure in the compression chamber 5 becomes lower than the external pressure during the charging operation, and allows the gas to flow into the compression chamber 5 from the outside to make the compression chamber 5 a negative pressure. Is preventing. The control valve 15 opens when the pressure in the compression chamber 5 reaches a certain pressure or more during the shut-off operation, causes the gas in the compression chamber 5 to flow out, and controls that the pressure in the compression chamber 5 becomes too high. ing.

At the time of energization, as shown in FIG. 1, the fixed contact 2 and the movable contact 3 make electrical contact, and a current flows between both contacts.

At the time of current interruption, as shown in FIG. 2, the movable contact 3 moves on a straight line and separates from the fixed contact 2, and an arc is generated between the fixed arc contact 9 and the movable arc contact 10. When the breaking current is large, the heat of the arc causes the first heating chamber 6 to communicate with the second heating chamber 6.
, The gas temperature in the heating chamber 7 rises, and at the same time, the pressure rises.
When the pressure in the first heating chamber 6 and the pressure in the second heating chamber 7 become higher than the pressure in the compression chamber 5, the communication port 18 between the first heating chamber 6 and the compression chamber 5 is closed by the check valve 13. The gas in the first and second heating chambers 6 and 7 is blown to the arc through the communication port 17.

When the breaking current is small, the pressure in the compression chamber 5 generated by mechanical compression becomes higher than the pressure in the first and second heating chambers 6 and 7, so that the first heating chamber 6 and the compression chamber 5 The check valve 13 is opened, and the gas compressed in the compression chamber 5 is blown to the arc through the communication port 18, the first heating chamber 6, and the communication port 17.

In this configuration, the first heating chamber 6 and the second
When the sum of the volumes of the heating chambers 7 is set to be equal to the volume of the conventional heating chamber 4 in FIG. 3, the pressure rise characteristics thereof are equivalent. Since the large current interrupting performance is determined by the pressure rise of the heating chamber, it can be said that the circuit breaker according to the first embodiment has the same interrupting performance as the conventional circuit breaker.

On the other hand, the volume of the first heating chamber 6, which is one of the factors that determine the size of the movable contact 3, is smaller than that of the conventional heating chamber 4 by the volume of the second heating chamber 7. . For this reason, the number of members constituting the first heating chamber 6 is smaller than that of the conventional heating chamber 4, and the movable contact 3 can be made smaller and lighter than the conventional heating chamber.

The breaking performance is also determined by the speed of the movable arc contact 10 and the compression speed of the compression chamber 5, that is, the moving speed of the movable contact 3. Here, assuming that the mass of the movable contact 3 is m, the operating force is F, and the speed of the movable contact 3 at the moving distance x is v, the following equation (1) is established from the law of conservation of energy.

Fx = (1/2) mv ²

Accordingly, the operating force F is obtained by the following equation (2).

F = mv ² / 2x

From the equation (2), the mass m of the movable contact 3 and the operating force F are in a proportional relationship. For example, by reducing the mass of the movable contact 3 to 90%, the movable contact 3 is driven to operate at the same speed as the conventional one. The operating force F for obtaining
It is understood that% is sufficient.

As a result, a low-power, low-cost, low-noise spring operating device can be applied, for example, where a high-output, noisy pneumatic operating device or a high-cost hydraulic operating device has been applied. .

Further, since the load and vibration applied to the respective members of the circuit breaker including the arc-extinguishing chamber are reduced by applying the low-output operating device, it is possible to apply smaller members as compared with the conventional one, and Small and lightweight.

As described above, according to the circuit breaker according to the first embodiment, by disposing a part of the heating chamber, which is located at the movable part of the heat puffer / mechanical puffer extinguishing chamber, at the fixed part,
The movable part can be reduced in weight, and a small and low-cost gas circuit breaker can be obtained without changing the shut-off performance.

That is, the circuit breaker according to the first embodiment includes a fixed contact 2 fixed to one end of the container 1 in a container 1 filled with an arc-extinguishing gas, and a fixed contact 2 moving in a straight line. A movable contact 3 configured to be electrically connectable to and detachable from the container 2; and a gas inside the container 1 which is heated by an arc when shutting off and cut off when an extremely large current is cut off. Heating chambers 6, 7 configured to blow out the arc with gas stored under high pressure;
In the above-mentioned movable contact 3, a circuit breaker having a compression chamber 5 configured to compress an internal gas to blow out an arc at the time of cutoff, wherein the heating chamber is fixed to the movable contact 3. And a second heating chamber 7 fixed to the container 1.
The heating chamber 6 and the second heating chamber 7 are always in communication regardless of the opening / closing operation of the movable contact 3.

[0041]

As described above, the circuit breaker according to the first aspect of the present invention provides a fixed contact fixed to one end of a container in a container filled with an arc-extinguishing gas, and an electric connection between the fixed contact and the fixed contact. A movable contact that moves on a straight line so that it can contact and separate from the other, and the gas inside is heated by the arc when shutting off, and the gas stored under high pressure blows the arc when interrupting an extremely large current. Heating room to turn off,
And a compression chamber in the movable contact, the compression chamber being configured to compress an internal gas at the time of cutoff to blow out an arc, wherein the heating chamber includes a first heating chamber disposed in a movable portion. And the second heating chamber disposed in the non-movable portion and communicating with the first heating chamber, so that the movable contact can be reduced in weight, and the breaking performance can be changed. The effect is that the cost can be reduced in a compact size without any cost.

As described above, in the circuit breaker according to a second aspect of the present invention, the first heating chamber is fixed to the movable contact, and the second heating chamber is fixed to the container. Since the first heating chamber and the second heating chamber are always in communication regardless of the opening / closing operation of the movable contact, it is possible to reduce the weight of the movable contact, and thus to reduce the size of the movable contact without changing the breaking performance. This has the effect of reducing costs.

As described above, in the circuit breaker according to claim 3 of the present invention, the first heating chamber is constituted by a space provided inside the movable contact and communicates with the compression chamber. Since the second heating chamber is constituted by a space between the outer wall of the movable contact and the case fixed to the container, the movable contact can be reduced in weight, and can be reduced in size without changing the shut-off performance. This has the effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross-sectional configuration of a circuit breaker according to Embodiment 1 of the present invention in a closed state.

FIG. 2 is a diagram showing a cross-sectional configuration of the circuit breaker according to Embodiment 1 of the present invention in a cut-off state.

FIG. 3 is a diagram showing a cross-sectional configuration of a conventional circuit breaker in a closed state.

FIG. 4 is a diagram showing a cross-sectional configuration of a conventional circuit breaker in an interrupted state.

[Explanation of symbols]

1 container, 2 fixed contacts, 3 movable contacts,
5 compression chamber, 6 first heating chamber, 7 second heating chamber, 8
Communication port, 9 fixed arc contact, 10 movable arc contact, 11 cylinder, 12 piston, 13 check valve,
14 check valve, 15 control valve, 16 case, 17 communication port, 18 communication port.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Haruhiko Kayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 5G001 AA08 AA13 BB03 CC03 DD03 DD07 EE01

Claims (3)

[Claims] 1. A fixed contact fixed to one end of the container in a container filled with an arc-extinguishing gas, a movable contact that moves on a straight line so as to be able to electrically contact and separate from the fixed contact, When the gas inside is heated by the arc and interrupts a very large current, the gas stored under high pressure blows out the arc inside the heating chamber, and in the movable contact, Is a circuit breaker provided with a compression chamber in which gas inside is compressed to blow out an arc, wherein the heating chamber has a first heating chamber disposed in a movable part, and a first heating chamber disposed in a non-movable part. The second communicating with the heating chamber
And a heating chamber. 2. The first heating chamber is fixed to the movable contact, the second heating chamber is fixed to the container, and the first heating chamber and the second heating chamber are The circuit breaker according to claim 1, wherein the circuit breaker is always in communication regardless of the opening / closing operation of the movable contact. 3. The first heating chamber includes a space provided inside the movable contact and communicates with the compression chamber, and the second heating chamber includes an outer wall of the movable contact and the container. 3. The circuit breaker according to claim 2, comprising a space between the case and the case fixed to the case.