JP2002075147A - Gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker which enables obtaining of proper characteristics for breaking, using small driving energy. SOLUTION: A movable contact part 20 is provided in a sealed container, filled with an arc-extinguishing gas. The movable contact part 20 comprises a fixed contact part 10 comprising a fixed arc contact 11 and a fixed conducting contact 12, operating rod 21, flange 22, puffer cylinder 23, movable arc contact 24, movable conducting contact 25, insulating nozzle 26, and fixed piston 27. An attached part 40, comprising an organic polymeric compound emitting hydrocarbon-based gas through ablation, is provided so as to be brought into contact with the flange 22 and the puffer cylinder 23 in a pressure-storing space S1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker for interrupting a current caused by a ground fault or a short circuit between lines in order to protect a transmission system or a distribution system. The present invention relates to a large capacity gas circuit breaker.

[0002]

2. Description of the Related Art A gas circuit breaker for interrupting a high current is widely used to protect a power transmission system and a distribution system in the event of a ground fault or a short circuit between lines. In particular, at present, 72
A puffer-type gas circuit breaker having a simple structure, high reliability, and excellent breaking performance is widely used as a protection switch for a high-voltage transmission system of kV or more.

An example of such a conventional gas circuit breaker will be described below with reference to FIGS. FIG. 32 is a sectional view showing a closed state, FIG. 33 is a sectional view showing a state immediately after the opening operation, FIG. 34 is a sectional view showing a state immediately after the opening operation is completed, and FIG. is there. In this prior art, a fixed contact portion 10 and a movable contact portion 20 are arranged opposite to each other in a container (not shown) filled with an arc-extinguishing gas. In the following description, regarding the positional relationship of the movable contact part 20, the fixed contact part 10 side is defined as the front, and the opposite side is defined as the rear.

[0004] The fixed contact portion 10 includes a fixed arc contact 1.
1 and a fixed energizing contact 12. On the other hand, the movable contact portion 20 includes the operation rod 21 and the flange 2.
2. Puffer cylinder 23, movable arc contact 24, movable energizing contact 25, insulating nozzle 26, fixed piston 27
It is constituted by. The operation rod 21 is provided so as to be able to reciprocate in the axial direction by a driving device (not shown), and has a plurality of communication holes 21a formed in the middle thereof.
The flange 22 is connected around the front end of the operation rod 21 and has a plurality of communication holes 22a. The fixed piston 27 is fixed in the container by the support portion 27a, is slidable relative to the outer peripheral surface of the operation rod 21 on its inner peripheral surface, and is fixed to the inner peripheral surface of the puffer cylinder 23 on its outer peripheral surface. It is provided so as to be relatively slidable with respect to it.

[0005] The opening operation of the above-described conventional gas circuit breaker will be described. That is, in the closed state, as shown in FIG. 32, the operating rod 21 is moving forward, and the movable arc contact 24 is in contact with the fixed arc contact 11. When the opening operation of the operating rod 21 is started from the closed state, in the initial stage of the operation, the movable contact portion 20 including the operating rod 21 moves integrally as shown in FIG. The contact 11 and the movable arc contact 24 are separated. At this time, a large current arc 30 is generated in the arc space S2 between the two arc contacts 11 and 24.

Here, the pressure in the pressure accumulating space S1 inside the puffer cylinder 23 is increased by a mechanical compression action due to the relative movement between the puffer cylinder 23 and the fixed piston 27. At this time, the arc space S2 is in a state of high temperature and high pressure due to the large current arc 30. For example, when the current of the large current arc 30 is 50 kA, the temperature easily reaches 10,000 K or more.

For this reason, the arc space S2 becomes the pressure accumulating space S1.
The pressure is further increased, and a gas flow 32a is generated from the internal space of the operation rod 21 to the pressure accumulating space S1 via the communication hole 21a. That is, a part of the energy of the large current arc 30 is taken into the pressure accumulating space S1. Therefore, as the opening operation proceeds, the pressure accumulation space S inside the puffer cylinder 23
1 is boosted by thermal action in addition to mechanical compression action.

As described above, when the electrode opening operation further proceeds in a state where the pressure in the pressure accumulating space S1 is sufficiently increased, as shown in FIG. 34, the throat portion S4 of the insulating nozzle 26 is opened and compressed in the pressure accumulating space S1. A gas flow 32b flows from the communication hole 22a toward the fixed arc contact 11 through the upstream gas flow path S3 between the movable arc contact 24 and the insulating nozzle 26 from the communication hole 22a. On the other hand, a gas flow 32c flowing from the hollow portion of the movable arc contact 24 toward the communication hole 21a provided in the operation rod 21 is also generated. However, at this stage, since the arc space S2 is almost closed by the large current arc 30 having a large diameter, the gas flows 32b and 32c are weak flows.

Further, as shown in FIG. 35, when the current reaches the zero point, the large current arc 30 is attenuated, and becomes the residual arc plasma 31, and the pressure, density and temperature decrease. As a result, the throat portion S4 of the insulating nozzle 26 is sufficiently opened, and strong gas flows 32d and 32e are generated. These two-way gas flows are synergistically powerfully cooled and extinguished, thereby interrupting current. Is achieved.

[0010]

By the way, the breaking capacity tends to increase due to an increase in breaking current and a decrease in the number of breaking points due to an increase in power demand and a demand for downsizing of power equipment in recent years. In particular, due to the demand for miniaturization, the processing energy per unit volume in the arc-extinguishing chamber of the gas circuit breaker is increasing, and it is necessary to cool the residual arc plasma with a stronger gas flow than before.

[Increase in driving energy] As described above,
In order to generate a high pressure including a strong gas flow, in a conventional puffer type gas circuit breaker, there are a method of increasing a mechanical compression effect and a method of increasing a thermal pressure increasing effect by taking in arc energy. Although it is conceivable to employ two methods, these methods have a problem of an increase in driving energy as described below.

First, in the former method, in order to obtain a high pressure that produces a strong gas flow at a current zero point, the pressure rise peak must be further increased. This problem will be described with reference to FIG. Note that FIG.
Shows the stroke curve (moving distance of the movable portion) and the pressure rise characteristics of the boosting chamber due to the mechanical compression action in the no-load opening operation. FIG. 36 shows current zero point times when the arc time is 0.75 cycles, 1.00 cycles, and 1.25 cycles.

As shown in FIG. 36, the pressure rise characteristic reaches a peak when the opening operation is almost completed and the movable portion is decelerated. Except for the case where the arc time is 0.75 cycles, the current reaches the zero point after the end of the opening operation. Therefore, at the current zero point, the pressure rise also has a value lower than the peak.

Therefore, except for a short arc time such as 0.75 cycle, in order to obtain a high pressure that produces a strong gas flow at the current zero point, an excessive pressure rise peak is required. This produces a remarkable reaction force that hinders the opening operation, and requires a large driving energy. On the other hand, even in the latter method, if an attempt is made to obtain a high pressure that produces a strong gas flow at the current zero point, the pressure rise peak must be even higher. Regarding this issue,
This will be described with reference to FIG. FIG. 37 is a graph showing characteristics of a gas circuit breaker of a type in which a pressure increase in a pressure accumulating chamber is obtained by using a thermal pressure increasing action by taking in arc energy in addition to a mechanical compression action. Each curve is a stroke curve (moving part moving distance),
The graph shows the pressure rise characteristics of the boosting chamber, the pressure rise with no load, that is, the pressure rise characteristics only due to the mechanical compression action, the breaking current, and the arc power injected into the arc space.

That is, as shown in FIG. 37, it can be seen that a higher pressure rise is obtained by taking in the arc energy than when no load is applied. However, the pressure rise characteristic changes substantially in synchronization with the arc power waveform, and the pressure rise at the current zero point has a value lower than the peak. Therefore, in order to obtain a high pressure that produces a strong gas flow at the current zero point, an excessive pressure rise peak is required. This produces a remarkable reaction force that hinders the opening operation, and requires a large driving energy.

As described above, in the conventional gas circuit breaker, since the pressure increase in the boosting chamber depends on the stroke curve and the arc power, the current zero point is often reached when the pressure falls below the peak value of the pressure increase. Therefore, in order to obtain a high pressure that produces a strong gas flow at the current zero point, a problem arises in that a significant reaction force generated by an excessive pressure rise peak and a resulting increase in driving energy.

[Type of Gas Used] SF6 gas, which has been frequently used as an effective arc-extinguishing gas for gas circuit breakers, has the following problems in connection with global warming. That is, the so-called global warming potential GWP of SF6 gas
(Global Warming Potential
s) was high, and was designated as a greenhouse gas for reduction at the Kyoto Conference on Global Warming Prevention (COP3) held in December 1997. At present, S
Since the total amount of F6 gas used is smaller than that of CO2 gas, reducing the emission of SF6 gas is regarded as an effective measure.

However, while the global warming potential of CO2 gas is 1, SF6 gas is much larger than 2490.
Since it is said to be about 0, it is considered more desirable to reduce the total used amount in the future. For this reason, the possibility of a gas circuit breaker that reduces the amount of SF6 gas used is being explored.

In order to cope with such social demands, for example, a SF6 gas breaker using SF6 gas has been used.
It is pointed out that even if a mixed gas of gas and N2 gas is used, a decrease in arc extinguishing performance cannot be avoided. That is,
When a mixed gas is used, the pressure in the pressure accumulating space is SF
As compared with the case where 6 gases are used, the pressure rises sharply, and the gas stored in the pressure accumulating space escapes at an early stage. Therefore, almost no pressure remains at the current zero point which is the target of cutoff, and sufficient arc extinguishing performance cannot be obtained. .

This is due to the difference in physical properties between the arc as the heat source and the gas held in the pressure accumulating space. That is, it is known that the enthalpy of the arc is larger in the N2 gas than in the SF6 gas, for example, in an arc of 10,000 K. Further, it is known that the specific heat of the gas held in the pressure accumulating space is smaller at 300 K in the N2 gas than in the SF6 gas, for example. Therefore, compared with SF6 gas, the mixed gas has a large energy held by the heat source and a small specific heat of the object to be heated, so that the temperature rises rapidly, and as a result, the pressure rises quickly.
The pressure drops quickly. For this reason, there is a problem that the shutoff performance is insufficient due to an early drop of the spray pressure.

In addition to the above problem, there is also a problem that the insufficient cooling capacity of the mixed gas itself accelerates a decrease in arc extinguishing performance. This will be described by taking as an example a molecular dissociation phenomenon which is one of important cooling processes. That is, the relatively low-temperature gas released as a gas stream from the pressure accumulating space is exposed to the arc and dissociates molecules, thereby removing energy from the arc and cooling. However, the dissociation energy of the N2 molecule is 9.2 eV, which is higher than the dissociation energy of one F atom in the SF6 molecule of 3.5 eV. Can not do it. For this reason, there arises a problem of insufficient shutoff performance due to insufficient cooling capacity of the mixed gas.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a gas circuit breaker capable of obtaining excellent shut-off performance with small driving energy. To provide.

[0023]

In order to achieve the above-mentioned object, the present invention provides a sealed container filled with an arc-extinguishing gas.
A first contact portion and a second contact portion having a first arc contact and a second arc contact which can be brought into contact with and separated from each other by relative movement are arranged to face each other, and the first arc contact and the second contact are provided.
An arc space in which an arc is generated when the arc contact is opened is provided between the arc contacts, and a gas flow generating means for extinguishing the arc includes at least one pressure accumulating space and a pressure increase for increasing the pressure of the pressure accumulating space. Means, at least one upstream gas flow path connecting the pressure accumulating space and the arc space, and at least one downstream side connecting the arc space and a downstream space which is a space having the same pressure as the filling pressure in the closed vessel. A gas flow path configured by a gas flow path, wherein the pressure increasing unit is configured by at least one of a mechanical compression unit that compresses the pressure accumulation space and a heating and pressure increasing unit that heats and pressures the pressure accumulation space. It has the following technical features.

That is, the invention according to claim 1 has pressure rise delay means for delaying a pressure rise in the pressure accumulating space, and the pressure rise delay means is provided in at least a part of the inside of the pressure accumulating space, The gas flow in the pressure accumulating space is constituted by an adherend that generates gas released by ablation by being heated to arc energy induced from the arc space via an upstream gas flow path, And a mixed gas of a neutral gas and the release gas. According to the first aspect of the present invention, the arc energy is absorbed by the adherend near the current peak, thereby suppressing an excessive pressure rise in the pressure accumulating space. The pressure rise of the pressure accumulation space can be improved by the released gas. Therefore,
The effect of delaying the pressure rise can be obtained, and an excessive pressure peak can be suppressed, and at the same time, a sufficient blowing pressure can be obtained at the current zero point.

According to a second aspect of the present invention, there is provided a pressure increasing delay means for delaying a pressure increase in the pressure accumulating space, wherein the pressure increasing delay means is provided in at least a part of the inside of the upstream gas flow path. The gas generated by the ablation is generated by being heated by the arc energy induced from the arc space, and is formed by an adherend that closes at least a part of the upstream gas flow path by the released gas in the vicinity of a current peak. It is characterized by being. According to the second aspect of the present invention, near the current peak,
Since the upstream gas flow path is blocked by the released gas, the pressure in the pressure accumulating space does not easily decrease even after the current peak has passed, and the pressure rise at the current zero point can be improved. Therefore, an effect of delaying the pressure rise can be obtained, and an excessive pressure peak can be suppressed, and at the same time, a sufficient blowing pressure can be obtained at the current zero point.

According to a third aspect of the present invention, there is provided a pressure increasing delay means for delaying a pressure increase in the pressure accumulating space, wherein the pressure increasing delay means comprises at least a part of the inside of the pressure accumulating space and the upstream gas passage. Provided in at least a part of the interior, heated by the arc energy induced from the arc space to generate a gas released by ablation, near the current peak, at least a part of the upstream gas flow path by the discharged gas. The high-pressure gas and the gas flow in the pressure accumulating space, which are constituted by the adhered portions to be closed, are a mixed gas of the arc-extinguishing gas and the released gas. According to the third aspect of the present invention, since the adhered portions are provided at two locations, that is, the pressure accumulating space and the upstream gas flow path, fine control of the pressure rise characteristic is possible. For example, in the case of a large current, excess arc energy is absorbed in the portion to be accumulated in the pressure accumulating space, and in the case of a small current, the upstream gas flow channel is blocked by the gas released from the deposited portion of the upstream gas channel. By doing so, a sufficient pressure rise can be obtained.

According to a fourth aspect of the present invention, in the gas circuit breaker according to any one of the first to third aspects, the attached portion is made of an organic polymer compound having a melting point of 400 ° C. or less. It is characterized by the following. In the above-described invention, since the melting point of the adhered portion is lower than 400 ° C., which is lower than the arc temperature, it is possible to cause the ablation action relatively easily. In addition, since the adhered portion can be provided at a position distant from the arc space, the degree of freedom of the configuration is increased.

According to a fifth aspect of the present invention, in the gas circuit breaker according to any one of the first to fourth aspects, the adhered portion includes an organic high-pressure gas in which the released gas is a pyrolysis gas having a molecular weight of 80 or less. It is characterized by being composed of a molecular compound.
In the invention as described above, since the organic polymer compound is converted into a very small gas having a molecular weight of 80 or less due to thermal decomposition, the number of molecules is increased, and the pressure rise near the current zero point can be significantly increased. .

According to a sixth aspect of the present invention, in the gas circuit breaker according to any one of the first to fifth aspects, the attached portion is made of a plurality of organic compounds having different melting points. And In the invention according to the sixth aspect as described above, even if the arc energy that can be taken into the pressure accumulating space due to the breaking current is different, it is possible to cause ablation to be caused on the adherend having a melting point corresponding to this.
Good breaking performance can be obtained regardless of the magnitude of the breaking current.

According to a seventh aspect of the present invention, in the gas circuit breaker according to any one of the first to sixth aspects, the pressure accumulating space has a first pressure increased by the mechanical compression means.
It is characterized by having a pressure accumulating chamber and a second pressure accumulating chamber in which the pressure is increased by the heating and pressurizing means. According to the seventh aspect of the present invention, by using two pressure accumulating spaces, it is possible to reduce a reaction force due to an excessive pressure rise and to obtain an efficient pressure rise.

According to an eighth aspect of the present invention, in the gas circuit breaker according to the first aspect, the pressure accumulating space is constituted by a movable cylinder and a fixed piston which operate relative to each other in conjunction with an opening operation. , Provided on the fixed piston. In the invention according to claim 8 described above, since the attached portion is provided on the fixed piston, it does not contribute to the movable weight. Therefore, an increase in driving energy due to an increase in movable weight can be suppressed.

According to a ninth aspect of the present invention, in the gas circuit breaker according to the first or second aspect, the pressure accumulating space or the upstream side during the opening operation even if the volume of the adhered portion is reduced by ablation. An elastic body for urging the adherend is provided so that the volume of the gas flow path is kept constant. According to the ninth aspect of the present invention, even if the volume of the adhered portion changes, the volume of the pressure accumulating space is kept constant, so that the pressure rise characteristic does not change. Alternatively, even when the volume of the adhered portion changes, the shape of the upstream gas flow path is kept constant, so that the characteristics of the gas flow do not change.

According to a tenth aspect of the present invention, in the gas circuit breaker according to the first or second aspect, the attachment portion is provided on at least a part of an inner surface of the pressure accumulating space or the upstream gas flow path. Characterized by comprising a coating layer. In the tenth aspect described above, it is not necessary to separately provide fixing means for the adherend. In addition, the inner surface of the pressure accumulating space or the upstream gas passage is protected from heat by the adhered portion.

According to an eleventh aspect of the present invention, in the gas circuit breaker according to the second aspect, at least a part of a member constituting the upstream gas flow path is constituted by the attached portion. I do. According to the eleventh aspect of the present invention, it is not necessary to separately provide the adhered portion and the fixing means thereof, and the manufacturing becomes easy.

The twelfth aspect of the present invention provides the first to eleventh aspects.
The gas circuit breaker according to any one of the above, further comprising a pressure release unit that opens when the pressure becomes equal to or higher than a predetermined value in the pressure accumulation space. According to the twelfth aspect of the present invention, the pressure-releasing means can suppress an excessive increase in pressure, and can suppress an increase in the reaction force and an accompanying increase in driving energy.

The invention according to claim 13 is the invention according to claims 1 to 12
In the gas circuit breaker according to any one of the above, the pressure accumulating space is configured by a movable cylinder and a piston portion that relatively operate in conjunction with the opening operation, and the piston portion includes:
It has a fixed member and a floating piston, wherein the fixed member and the floating piston are connected by an elastic body having a natural length at the beginning of the opening operation. According to the invention of the thirteenth aspect, the floating piston supported by the elastic body can suppress an excessive rise in pressure, and can suppress an increase in a reaction force and an accompanying increase in drive energy.

The invention according to claim 14 is the invention according to claims 1 to 13
In the gas circuit breaker according to any one of the above, the pressure accumulating space is configured by a movable cylinder and a piston portion that relatively operate in conjunction with the opening operation, and the volume of the accumulating space before the opening operation is Vo. When the volume of the pressure accumulating space after the opening operation is defined as Ve,

## EQU2 ## The characteristic is set so that Ve.gtoreq.1 / 3 (Vo-Ve). In the invention of the fourteenth aspect described above, since the residual volume of the pressure accumulating space is sufficiently large, it is possible to suppress the pressure rise peak and promote the pressure rise delay effect.

The invention according to claim 15 is the invention according to claims 1 to 14.
The gas circuit breaker according to any one of the above, further comprising a detecting means for detecting a residual amount of the adhered portion. According to the invention of the fifteenth aspect, an alarm can be issued when the remaining amount of the adhered portion is reduced and sufficient shutoff performance cannot be obtained.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a gas circuit breaker according to the present invention will be specifically described with reference to the drawings. [1. First Embodiment] An embodiment corresponding to the first aspect of the present invention will be described with reference to FIGS. 1 shows a state at the beginning of the opening operation, FIG. 2 shows a state immediately after the end of the opening operation,
FIG. 3 is a cross-sectional view showing a state where the current reaches a zero point. FIG. 4 is a diagram showing a pressure change ΔP based on the sealing pressure in the opening operation of the pressure accumulating space S1, which will be described later, under the same speed condition in the case of the conventional arc extinguishing chamber and the case of the present embodiment. The pressure characteristics are shown. FIG. 4 also shows the stroke curve, the breaking current waveform, and the arc power injected into the arc space. Further, in the following description, regarding the positional relationship of the movable contact portion 20, the direction toward the fixed contact portion 10 is defined as the front, and the opposite side is defined as the rear. Further, any gas can be used as the arc-extinguishing gas, but in this embodiment, the volume ratio is S.
It is assumed that a mixed gas of 30% of F6 gas and 70% of N2 gas is used.

[1-1. Configuration] First, the configuration of the present embodiment will be described. That is, in the present embodiment, the first contact portion defined as the fixed contact portion 10 and the movable contact portion 20 are defined in a container (not shown) filled with the arc-extinguishing gas. The second contact portion is disposed to face the second contact portion. The fixed contact portion 10 includes a fixed arc contact 11 and a fixed energizing contact 12 arranged around the fixed arc contact 11.

On the other hand, the movable contact portion 20 is connected to a hollow operation rod 21, a flange 22 disposed around the operation rod 21 and connected to the operation rod 21 at a front end portion, and a rear portion of the flange 22. A puffer cylinder 23, a movable arc contact 24 having a finger-like cross section and connected to the front of the flange 22, a movable energizing contact 25 disposed around the movable arc contact 24, and an insulating insulating nozzle surrounding the movable arc contact 24. 26, a fixed piston 27 inserted into the puffer cylinder 23.

The operating rod 21 of the movable contact portion 20 as described above is configured to reciprocate in its axial direction by a driving device (not shown). In the middle of the operating rod 21, there are provided a plurality of communication holes 21a for communicating the hollow portion with the filling gas atmosphere space. Further, between the movable arc contact 24 and the insulating nozzle 26, the gas compressed in the pressure accumulating space S 1 inside the puffer cylinder 23 is used as a gas flow, through a communication hole 22 a provided in the flange 22, and through the arc space S 2. Upstream gas flow path S3 is formed to guide the flow to the upstream side.

The fixed piston 27 is formed in the shape of a circular flat plate. The fixed piston 27 slides on the inner peripheral surface with respect to the outer peripheral surface of the operating rod 21, and the outer peripheral surface thereof forms the puffer cylinder 23.
Is configured to slide with respect to the inner peripheral surface. Further, the fixed piston 27 is fixed in a container (not shown) by a support portion 27a integrally provided behind the fixed piston 27 and extending in the axial direction.

The operating rod 21 and the puffer cylinder 23 are fixed to the fixed piston 27 fixed as described above.
Move integrally, the puffer cylinder 23
And the fixed piston 27 relatively move, whereby the pressure accumulating space S1 formed inside the puffer cylinder 23 is compressed.

Further, inside the pressure accumulating space S1, a flange 2 is provided.
2 so as to be in contact with the puffer cylinder 23.
Is provided. The adherend 40 is made of, for example, an organic polymer compound, such as polyacetal, which releases a hydrocarbon-based gas by ablation.
Here, ablation refers to a phenomenon in which a gas is released by at least one process of melt vaporization, sublimation, or thermal decomposition due to heating of a solid substance.

[1-2. Operation] The operation of the present embodiment having the above configuration is as follows. That is, in the initial state of the opening operation, as shown in FIG. 1, the movable contact portion 20 including the operation rod 21 moves integrally, and the fixed arc contact 11 and the movable arc contact 2
4 separates. At this time, a large current arc 30 is generated in the arc space S2 between the arc contacts 11 and 24.

Here, the pressure in the pressure accumulating space S1 inside the puffer cylinder 23 is increased by a mechanical compression action due to the relative movement between the puffer cylinder 23 and the fixed piston 27. At this time, the arc space S2 is in a state of high temperature and high pressure due to the large current arc 30. For example,
When the current of the high current arc 30 is 50 kA, the temperature easily reaches 10,000 K or more. For this reason, the pressure in the arc space S2 rises more than the pressure in the pressure accumulating space S1, and the operation rod 2
A gas flow 32a from the internal space 1 to the accumulator space S1 via the communication hole 21a and a gas flow 32b to the accumulator space S1 via the upstream gas flow path S3 are generated. That is, part of the energy of the large current arc 30 is taken into the pressure accumulating space S1. Therefore, as the opening operation proceeds, the pressure accumulating space S1 inside the puffer cylinder 23 is boosted by the thermal boosting action in addition to the mechanical compression action.

Further, as shown in FIG. 2, even when the opening operation is completed and the throat portion S4 of the insulating nozzle 26 is opened, when the current is near the peak, the throat portion S4 is closed.
Are closed by a large current arc 30. At this stage, the gas flow 32b reaching the pressure accumulating space S1 via the upstream gas flow path S3 and the gas flow 32c flowing from the hollow portion of the movable arc contact 24 toward the communication hole 21a provided in the operation rod 21 are formed. appear. Therefore, the pressure accumulating space S1 is continuously pressurized by the thermal pressurizing action.

In the present embodiment, the arc energy continuously taken into the pressure accumulating space S1 from the beginning to the end of the opening operation shown in FIGS.
The adherend 40 is heated. In general, the specific heat of a solid object is c, the mass is m, the melting point is Tm, the latent heat is QL, and the ambient temperature is T.
Assuming that it is o, the solid object absorbs energy represented by the following formula, and then is released into space as a gas.

[Equation 3] mc (Tm−To) + mQL [J]

That is, since a part of the arc energy taken into the pressure accumulating space S1 is absorbed by the adhered portion 40, the peak of the pressure increase in the pressure accumulating space S1 is suppressed to be lower than in the prior art.

Further, as shown in FIG. 3, when the current reaches the zero point, the large current arc 30 is attenuated, and becomes the residual arc plasma 31, and the pressure, density and temperature decrease. As a result, the throat portion S4 of the insulating nozzle 26 is sufficiently opened, and the gas flow 32d flowing from the gas flow path between the movable arc contact 24 and the insulating nozzle 26 toward the fixed arc contact 11 and the movable arc contact 32 A gas flow 32e flows from the hollow portion of the armature 24 toward the communication hole 21a provided in the operation rod 21.

At this stage, the adherend 40 is in the pressure accumulating space S
Part of the arc energy taken in by 1 is sufficiently absorbed, and ablation gas 41 is gradually generated by the ablation action. That is, the released ablation gas 41 improves the pressure and density of the pressure accumulating space S1 near the current zero point. Therefore, a strong gas flow 3 in two directions
2d and 32e are generated, and this gas flow synergistically cools and extinguishes the arc to achieve current interruption.

As shown in FIG. 4, the pressure characteristics of the pressure accumulating space S1 in this embodiment and the prior art are different. This is mainly due to the energy absorbing action of the adherend 40 near the current peak and the ablation action near the current zero point. That is, since the heat capacity and latent heat of the solid substance are generally large, the pressure increase due to the ablation gas involves a time delay as compared with the mechanical compression action and the thermal pressure increase action. In the present embodiment, a part of the arc energy induced through the upstream gas passage S3 is applied to the adherend 40 provided inside the pressure accumulating space S1.
And the pressure rise peak near the current peak can be suppressed, so that the adhered portion 40 functions as a pressure rise delay unit and has a function of buffering the arc energy.
In an actual configuration, it is necessary to configure the heat capacity of the adherend 40 such that sufficient gas is released by ablation at the current zero point.

[1-3. Effect] According to the present embodiment as described above, the pressure rise peak near the current peak can be suppressed, and the blowing gas having a sufficient pressure and density can be obtained near the current zero point. Further, since the blowing gas is a mixed gas of the arc-extinguishing gas and the ablation gas 41, the cooling performance of the gas itself is improved. For this reason, in the gas circuit breaker in which the usage amount of the SF6 gas is reduced, stable and high breaking performance can be obtained even with a small driving energy.

The general principle of extinguishing a gas circuit breaker will now be described. Generally, plasma is cooled by heat conduction, convection, radiation, etc., but in a gas circuit breaker, forced convection due to gas flow is generated, that is, fresh air is stored from an accumulating space into an arc space where residual arc plasma exists. It is cooled strongly by supplying and mixing the gas. At this time, microscopically, the atomic and molecular processes performed for dissociation and electron attachment occur, realizing rapid cooling. Therefore, in the gas circuit breaker, generating a strong gas flow at a high blowing pressure to supply high-density gas molecules to promote dissociation and electron attachment is effective for improving the breaking performance.

According to the present embodiment from this viewpoint, since the gas flows 32d and 32e are a mixed gas containing the ablation gas 41, the density of the blowing gas is high.
The cooling effect increases. In addition, the ablation gas 41
For example, a high diffusivity low molecular hydrocarbon gas such as methane gas is included, so that the cooling effect is further enhanced.

[2. Second Embodiment] [2-1. Configuration] An embodiment corresponding to the second aspect of the invention will be described with reference to FIGS. FIGS. 5 to 7 correspond to FIGS. 1 to 3 in the first embodiment, and FIG. 8 corresponds to FIG. 4 in the first embodiment. That is, in the present embodiment, the attachment portion 40 is provided on the outer surface of the movable arc contact 24 inside the upstream gas flow path S3. The attached portion 40 is configured to have a smaller heat capacity than that shown in the first embodiment. The other parts are configured in the same manner as in the first embodiment.

[2-2. Operation] The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, from the beginning to the end of the opening operation shown in FIGS. 5 and 6, the adherend 40 is heated by the arc energy continuously taken in through the upstream gas flow path S3. Therefore, the adherend 40 absorbs a part of the arc energy.

The adhered portion 40 has a smaller heat capacity than that of the first embodiment, and is close to the arc space and can absorb a part of the arc energy at an early stage. The ablation gas 41 is generated gradually. As a result, the upstream gas flow path S3 having a small cross-sectional area is closed, so that the pressure in the pressure accumulating space S1 hardly decreases even after the current peak has passed and the intake of arc energy has decreased.

Further, as shown in FIG. 7, when the current reaches the zero point, the large current arc 30 is attenuated to become the residual arc plasma 31, and the pressure, density and temperature decrease. As a result, the throat portion S4 of the insulating nozzle 26 is sufficiently opened, and the gas flow 32d flowing from the gas flow path between the movable arc contact 24 and the insulating nozzle 26 toward the fixed arc contact 11 and the movable arc contact 32 A gas flow 32e flows from the hollow portion of the armature 24 toward the communication hole 21a provided in the operation rod 21.

At this stage, since there is almost no arc energy, the ablation gas 41
Is suppressed, and the upstream gas passage S3 is open. Therefore, strong two-way gas flows 32d and 32e are generated, and the gas flows synergistically cool and extinguish the arc to achieve current interruption.

As shown in FIG. 8, the pressure characteristics of the pressure accumulating space S1 in this embodiment and the prior art are different. This is mainly due to the ablation action of the adherend 40 near the current peak, and the upstream gas flow path S
3 is closed. In other words, part of the arc energy induced through the upstream gas flow path S3 is absorbed by the adherend 40, and the ablation gas 41 generated near the current peak blocks the upstream gas flow path S3. Since the decay of the pressure rise is accompanied by a time lag with respect to the decay of the current, the adherend 40 functions as a pressure rise delay means. In an actual configuration, it is necessary to configure the heat capacity of the adherend 40 so that a sufficient amount of the ablation gas 41 is released near the current peak.

[2-3. Effect] According to the present embodiment as described above, after the current peak, the peak time of the pressure rise with respect to the current decay can be delayed to maintain a high pressure rise near the current zero point. In a gas circuit breaker whose usage is reduced, a stable and high breaking performance can be obtained even with a small driving energy.

[3. Third Embodiment] [3-1. Configuration] An embodiment corresponding to the invention described in claim 6 will be described with reference to FIG. FIG. 9 shows the configuration of the attachment section 40. That is, the adherend 40 in the present embodiment is composed of the low melting point material 40a and the high melting point material 40b. Note that F in FIG. 9 is a fixing member. The other parts are configured in the same manner as in the first embodiment.

[3-2. Operation and Effect] The present embodiment as described above basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment,
The material that generates the ablation gas 41 can be changed depending on the cutoff current value. That is, when the breaking current is small and the arc energy is small, the ablation gas 41 is generated from the low melting point material 40a, and when the arc energy is large, ablation is generated from the low melting point material 40a and the high melting point material 40b. For example,
The low melting point material 40a can be configured to generate a low molecular weight gas effective for low current interruption, and the high melting point material 40b can be configured to generate an electrically negative gas effective for high current interruption. . Therefore, according to the present embodiment, good breaking performance can be obtained regardless of the magnitude of the breaking current value.

[4. Fourth Embodiment] [4-1. Configuration] An embodiment corresponding to the seventh aspect of the present invention will be described with reference to FIGS. FIG.
FIG. 11 is a sectional view showing a state at the initial stage of the opening operation, and FIG. That is, in the present embodiment, the partition wall 42 that divides the pressure accumulation space into the first pressure accumulation chamber S1 and the second pressure accumulation chamber S5 is provided. Further, the adherend 40 is provided in the second pressure accumulation chamber S5. The other parts are configured in the same manner as in the first embodiment.

[4-2. Operation and Effect] The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, as shown in FIG.
The pressure is increased mainly by the mechanical compression action due to the relative movement of the fixed piston 27, and the second pressure accumulating chamber S5 is heated mainly by the arc energy and ablated gas 41
Is increased by the thermal pressure increasing action by the adherend 40 that generates the pressure. Here, since only the first pressure accumulating chamber S1 contributes to the reaction force, the pressure increase of the first pressure accumulating chamber S1 is reduced by the second pressure accumulating chamber S1.
If it is set to be smaller than 5, the reaction force due to an excessive pressure rise can be reduced, and an efficient pressure rise can be obtained by using two accumulators.

[5. Fifth Embodiment] [5-1. Configuration] An embodiment corresponding to the invention described in claim 8 will be described with reference to FIGS. FIG.
FIG. 13 is a sectional view showing a state at the beginning of the opening operation, and FIG. That is, in the present embodiment, the attached portion 40 is provided on the fixed piston 27 in the pressure accumulation space S1. The other parts are configured in the same manner as in the first embodiment.

[5-2. Operation and Effect] The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, since the attached portion 40 is provided on the fixed piston 27 side, as shown in FIG. 13, the weight of the moving operation rod 21 and the puffer cylinder 23 does not increase. Therefore, it is possible to suppress an increase in the movable weight and to reduce the driving energy.

[6. Sixth Embodiment] [6-1. Configuration] An embodiment corresponding to the ninth aspect of the present invention will be described with reference to FIGS. FIG.
FIG. 15 is a sectional view showing a state at the initial stage of the opening operation, and FIG. 15 is a sectional view showing a state reaching a current zero point. That is, in the present embodiment, in the pressure accumulating space S <b> 1, the adherend 40 is fixed to the floating support 44, and the floating support 44 is connected and supported to the fixed piston 27 via the spring 45. The adhered portion 40 is urged toward the pressure accumulating space S1 by a spring 45, and the position of the surface of the adhered portion 40 on the pressure accumulating space S1 side is determined by a fixed presser 46 provided on the fixed piston 27. ing. For other parts,
The configuration is the same as that of the embodiment.

[6-2. Operation and Effect] The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, even if the volume of the adherend 40 is reduced by ablation, the position of the surface of the adherend 40 on the side of the pressure accumulating space S1 is always constant because it is urged by the spring 45. Become. Therefore, since the volume of the pressure accumulation space S1 is kept constant, the pressure rise characteristic does not change.

[7. Seventh Embodiment] [7-1. Configuration] An embodiment corresponding to the tenth aspect of the present invention will be described with reference to FIGS. FIG.
6 is a sectional view showing a state at the initial stage of the opening operation, and FIG. 17 is a sectional view showing a state reaching a current zero point. That is, in the present embodiment, the adherend 40 is configured as a coating layer applied to the inner surface of the puffer cylinder 23.
The other parts are configured in the same manner as in the first embodiment.

[7-2. Operation and Effect] The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. That is, as shown in FIG. 17, the ablation gas 41 generated from the adherend 40 heated by the arc energy is supplied to the pressure accumulating space S1. In the present embodiment, since the adherend 40 is provided as a coating layer, it is not necessary to separately provide a fixing means for the adherend 40, and the manufacturing becomes easy. Further, since the inner surface of the puffer cylinder 23 is protected from heat by the coating layer of the adherend 40, the durability is improved.

[8. Eighth Embodiment] [8-1. Configuration] An embodiment corresponding to the invention described in claim 11 will be described with reference to FIG. 18 and FIG. FIG. 18 is a cross-sectional view showing a state in the initial stage of the opening operation, and FIG. 19 is a cross-sectional view showing a state in which the current reaches a zero point. That is, in the present embodiment, the attachment portion 40 is configured as a part of the insulating nozzle 26. The other parts are configured in the same manner as in the second embodiment.

[8-2. Operation and effect] The present embodiment having the above configuration basically has the same operation and effect as the above-described second embodiment. That is, as shown in FIG. 19, the ablation gas 41 generated from the adherend 40 heated by the arc energy is supplied to the upstream gas passage S3. In the present embodiment, since the attached portion 40 is configured as a part of the insulating nozzle 26, it is not necessary to separately provide a fixing means for the attached portion 40, and the manufacturing becomes easy.

[9. Ninth Embodiment] [9-1. Configuration] Another embodiment corresponding to the tenth aspect of the present invention will be described with reference to FIGS. FIG. 20 is a cross-sectional view showing a state in the initial stage of the opening operation, and FIG. 21 is a cross-sectional view showing a state in which the current reaches a zero point. That is, in the present embodiment, the adherend 40 is configured as a coating layer applied to the inner surface of the insulating nozzle 26. The other parts are configured in the same manner as in the second embodiment.

[9-2. Operation and effect] The present embodiment having the above configuration basically has the same operation and effect as the above-described second embodiment. That is, as shown in FIG. 21, the ablation gas 41 generated from the adherend 40 heated by the arc energy is supplied to the upstream gas passage S3. In the present embodiment, since the adhered portion 40 is provided as a coating layer on the inner surface of the insulating nozzle 26, there is no need to separately provide a fixing means for the adhered portion 40, and the manufacturing is facilitated. Further, since the insulating nozzle 26 is protected from the heat and light of the arc by the adhered portion 40, the durability is improved.

[10. Tenth embodiment] [10-1. Configuration] An embodiment corresponding to the third aspect of the present invention will be described with reference to FIGS. FIG.
2 is a sectional view showing a state at the beginning of the opening operation, and FIG. That is, in the present embodiment, the attached portion 40 is provided on the fixed piston 27 in the pressure accumulation space S1. In addition, the second attached portion 47
The movable arc contact 24 is provided on the outer peripheral surface. The other parts are configured in the same manner as in the first embodiment.

[10-2. Operation and Effect] The present embodiment having the above-described configuration is basically the same as the above-described first embodiment and second embodiment. However, in the present embodiment, since the adhered portion 40 and the second adhered portion 47 are provided at two locations of the pressure accumulating space S1 and the upstream gas flow path S3, respectively, fine control of the pressure rise characteristic is performed. Becomes possible. For example, in the case of a large current, excessive arc energy is absorbed by the adhered portion 40 in the pressure accumulating space S1, and in the case of a small current, the upstream gas flow path S3 is blocked by the ablation gas 41 generated from the adhered portion 47. Therefore, a sufficient pressure rise can be obtained.

[11. Eleventh Embodiment] [11-1. Configuration] An embodiment corresponding to the twelfth aspect of the present invention will be described with reference to FIGS. FIG. 24 is a cross-sectional view showing a state at the initial stage of the opening operation, and FIG. 25 is a cross-sectional view showing a state where the current reaches a zero point. That is, in the present embodiment, the attachment portion 40 is provided on the flange 22 in the pressure accumulation space S1. In addition, the fixed piston 27 has
A valve 49 is provided, and is configured to open when the pressure in the pressure accumulation space S1 becomes equal to or higher than a certain value. The other parts are configured in the same manner as in the first embodiment.

[11-2. Operation and Effect] The present embodiment having the above-described configuration is basically the same as the above-described first embodiment. However, in the present embodiment, since the valve 49 opens at a pressure equal to or higher than a certain value, it is possible to suppress an excessive increase in the pressure inside the pressure accumulating space S1, and to suppress an increase in the reaction force and an increase in the driving energy associated therewith. it can.

[12. Twelfth Embodiment] [12-1. Configuration] An embodiment corresponding to the invention described in claim 13 will be described with reference to FIGS. 26 and 27. FIG. FIG. 26 is a cross-sectional view showing a state at the initial stage of the opening operation, and FIG. 27 is a cross-sectional view showing a state where the current reaches a zero point. That is, in the present embodiment, the piston is constituted by the floating piston 48 connected to the support portion 27a via the spring 45. The spring 45 is in the initial stage of the opening operation.
It is configured to be of natural length. The other parts are configured in the same manner as in the first embodiment.

[12-2. Operation and Effect] The present embodiment having the above configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, if the pressure in the pressure accumulating space S1 becomes excessive, the floating piston 48 is urged toward the support portion 27a and moves, so that the volume of the pressure accumulating space S1 increases. Thus, the pressure increase in the pressure accumulating space S1 is moderated, and the excessive pressure increase is suppressed, so that it is possible to suppress the increase in the reaction force and the accompanying increase in the driving energy.

[13. Thirteenth Embodiment] Another embodiment corresponding to the first aspect of the present invention will be described with reference to FIG. FIG. 28 shows the configuration of the attachment section 40. That is, in the present embodiment, the adherend 40 is made of a porous material. In addition, F of FIG. 28 is a fixing member. The other parts are configured in the same manner as in the first embodiment.

The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, since the adherend 40 is porous, its surface area increases. Therefore, the ablation action can be further promoted. Note that the same effect can be obtained by increasing the surface area even if the adhered portion 40 is formed of a material having a honeycomb shape or a multilayer structure.

[14. Fourteenth embodiment] [Claim 16]
An embodiment corresponding to the described invention will be described with reference to FIG. FIG. 16 shows the configuration of the attachment section 40. That is, in the present embodiment, the adherend 40 and the fixing member F
A temperature detecting section 50 is provided in the vicinity of the boundary surface. The other parts are configured in the same manner as in the first embodiment.

The present embodiment having the above-described configuration basically has the same operation and effect as the above-described first embodiment. However, in the present embodiment, when the volume of the adherend 40 decreases due to the ablation action, the temperature detector 50 detects the high-temperature gas. Therefore, by setting the reference detection temperature to an appropriate value, when the volume of the adherend 40 falls below the reference value, a system that detects the corresponding temperature and issues an alarm is configured. Can be. By operating such a detection function only during the opening operation, a system that does not need to be constantly monitored can be provided.

[15. Fifteenth Embodiment] Claim 16
Another embodiment corresponding to the described invention is shown in FIGS.
This will be described with reference to FIG. FIG. 30 shows a case where the volume of the adherend 40 is large, and FIG. 31 shows a case where the volume of the adherend 40 is reduced by ablation after several degrees of interruption. That is, in the present embodiment, the energy storage spring 5
The attached portion 40 is disposed between the switches 52 urged by the switch 1, and the switch 52 is configured to close when the thickness of the attached portion 40 becomes equal to or less than a predetermined value. The other parts are configured in the same manner as in the first embodiment.

The present embodiment having the above configuration basically has the same operation and effect as the fourteenth embodiment. However, in the present embodiment, when the thickness of the adherend 40 becomes equal to or less than the reference value, the thickness can be directly detected, so that a system for issuing an alarm can be more easily configured. .

[16. Other Embodiments] The present invention is not limited to the embodiments described above, and various other embodiments can be implemented. For example, the present invention can be applied to a circuit breaker having no mechanical compression action. Also, various shapes and materials can be applied to the configuration of the adherend. For example,
The adherend is desirably made of an organic polymer compound having a melting point of 400 ° C. or lower. With this configuration, since the melting point of the adhered portion is lower than 400 ° C., which is lower than the arc temperature, it is possible to cause the ablation action relatively easily. In addition, this allows the attachment portion to be provided at a location distant from the arc space, thereby increasing the degree of freedom in configuration.

It is preferable that the adhered portion is made of an organic polymer compound in which the ablation gas becomes a pyrolysis gas having a molecular weight of 80 or less. With this configuration, the organic polymer compound becomes a very small gas having a molecular weight of 80 or less due to thermal decomposition, so that the number of molecules is increased and the pressure rise near the current zero point can be significantly increased. The ablation gas according to the material of the adherend is, specifically, a diffusible gas such as hydrogen, a rare gas or a hydrocarbon gas, or an electrically negative gas such as a carbon dioxide gas, an oxygen gas, or a fluoride gas. By including at least one kind, the cooling capacity of the gas can be improved.

In addition, at least in the initial stage of the opening operation, a large amount of arc energy is introduced into the pressure accumulating space, and a communication hole is formed so as to generate a large number of gas flows on the upstream side in order to promote the ablation action of the adherend. It is desirable to provide many.

Further, the pressure accumulating space can be configured as follows. That is, the volume of the accumulator space before the opening operation is Vo, and the volume of the accumulator space after the opening operation is Ve.
When we define

## EQU4 ## It is set so that Ve.gtoreq.1 / 3 (Vo-Ve). According to such a configuration, since the residual volume of the pressure accumulating space is sufficiently large, the peak of the pressure rise is suppressed, and the above-described pressure rise delay effect can be further promoted.

[0094]

As described above, according to the present invention,
It is possible to provide a gas circuit breaker capable of obtaining excellent breaking performance with small driving energy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state immediately after the opening operation of the gas circuit breaker shown in FIG. 1 is completed.

FIG. 3 is a sectional view showing a state in which the current reaches zero in the gas circuit breaker of FIG. 1;

FIG. 4 is a diagram showing a pressure change and the like inside a pressure accumulating chamber in the gas circuit breaker of FIG. 1;

FIG. 5 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a state immediately after the opening operation in the gas circuit breaker of FIG. 5;

FIG. 7 is a sectional view showing a state in which the current reaches zero in the gas circuit breaker of FIG. 5;

FIG. 8 is a diagram showing a pressure change and the like inside a pressure accumulating chamber in the gas circuit breaker of FIG. 5;

FIG. 9 is a diagram showing a configuration of a portion to be adhered in a gas circuit breaker according to a third embodiment of the present invention.

FIG. 10 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a fourth embodiment of the present invention.

11 is a cross-sectional view showing a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 10 is completed.

FIG. 12 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a fifth embodiment of the present invention.

13 is a cross-sectional view showing a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 12 is completed.

FIG. 14 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a sixth embodiment of the present invention.

FIG. 15 is a cross-sectional view showing a state where the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 14 is completed.

FIG. 16 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a seventh embodiment of the present invention.

FIG. 17 is a cross-sectional view showing a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 16 is completed.

FIG. 18 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to an eighth embodiment of the present invention.

FIG. 19 is a cross-sectional view illustrating a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 18 is completed.

FIG. 20 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a ninth embodiment of the present invention.

FIG. 21 is a cross-sectional view showing a state where the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 20 is completed.

FIG. 22 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a tenth embodiment of the present invention.

FIG. 23 is a cross-sectional view showing a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 22 is completed.

FIG. 24 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to an eleventh embodiment of the present invention.

FIG. 25 is a cross-sectional view showing a state where the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 24 is completed.

FIG. 26 is a sectional view showing an initial state of an opening operation in a gas circuit breaker according to a twelfth embodiment of the present invention.

FIG. 27 is a cross-sectional view showing a state in which the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 26 ends.

FIG. 28 is a diagram showing a configuration of a portion to be adhered according to a thirteenth embodiment of the present invention.

FIG. 29 is a diagram showing a configuration of a portion to be adhered according to a fourteenth embodiment of the present invention.

FIG. 30 is a diagram showing a configuration of a portion to be adhered according to a fifteenth embodiment of the present invention.

FIG. 31 is a diagram showing a state in which the number of adherends in FIG. 30 is reduced.

FIG. 32 is a cross-sectional view showing a closed state in an example of a conventional gas circuit breaker.

FIG. 33 is a sectional view showing an initial state of the opening operation in the gas circuit breaker of FIG. 32;

FIG. 34 is a sectional view showing a state immediately after the opening operation of the gas circuit breaker of FIG. 32 is completed.

FIG. 35 is a sectional view showing a state where the current reaches a zero point after the opening operation of the gas circuit breaker of FIG. 32 is completed.

FIG. 36 is a diagram showing a pressure change and the like inside a pressure accumulation chamber in an example of a conventional gas circuit breaker.

FIG. 37 is a diagram showing a change in pressure and the like inside a pressure accumulation chamber in an example of a conventional gas circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Fixed contact part (1st contact part) 11 ... Fixed arc contact 12 ... Fixed energizing contact 20 ... Movable contact part (2nd contact part) 21 ... Operating rods 21a and 22a ... Communication hole 22 ... Flange 23 ... Puffer cylinder 24 ... Movable arc contact 25 ... Movable energizing contact 26 ... Insulating nozzle 27 ... Fixed piston 27a ... Support 30 ... High current arc 31 ... Remaining arc plasma 32a-32e ... Gas flow 40 ... Deposited part 41 Ablation gas 42 Partition wall 43 Second pressure accumulating chamber 44 Floating support 45 Spring 46 Fixed holder 47 Second attached part 48 Floating piston 49 Valve 50 Temperature detector 51 Energy storage spring 52 switch

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenji Arai 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term inside the Toshiba Hamakawasaki Plant (reference) 5G001 AA10 BB03 DD01 DD06 EE01

Claims (15)

[Claims] Claims: 1. A sealed container filled with an arc-extinguishing gas,
A first contact portion and a second contact portion having a first arc contact and a second arc contact which can be brought into contact with and separated from each other by relative movement are arranged to face each other, and the first arc contact and the second contact are provided.
An arc space in which an arc is generated when the arc contact is opened is provided between the arc contacts, and a gas flow generating means for extinguishing the arc includes at least one pressure accumulating space and a pressure increase for increasing the pressure of the pressure accumulating space. Means, at least one upstream gas flow path connecting the accumulating space and the arc space, and at least one downstream connecting the downstream space, which is a space having the same pressure as the filling pressure in the closed vessel, and the arc space. Side gas flow path, wherein the pressure increasing means is a gas circuit breaker configured by at least one of a mechanical compression means for compressing the pressure accumulating space and a heating / pressurizing means for heating / pressurizing the pressure accumulating space, It has pressure rise delay means which delays pressure rise of the above-mentioned pressure accumulation space, The above-mentioned pressure rise delay means is provided in at least one copy inside the above-mentioned pressure accumulation space. Heated to the arc energy induced from the arc space through the upstream gas flow path, is constituted by an adherend that generates gas released by ablation, the gas flow inside the pressure accumulating space, A gas circuit breaker, which is a mixed gas of the arc-extinguishing gas and the released gas. 2. A first contact portion and a second contact portion having a first arc contact and a second arc contact which can be separated from each other by relative movement in a closed container filled with an arc-extinguishing gas. Are arranged facing each other, an arc space in which an arc is generated when the arc is opened is provided between the first arc contact and the second arc contact, and at least one gas flow generating means for extinguishing the arc is provided. Pressure accumulating spaces, pressure increasing means for increasing the pressure of the pressure accumulating spaces, at least one upstream gas flow path connecting the accumulating spaces and the arc space, and a space having the same pressure as the filling pressure in the closed vessel. And at least one downstream gas flow path connecting the arc space, wherein the pressure increasing means comprises:
In a gas circuit breaker constituted by at least one of a mechanical compression unit for compressing the accumulator space and a heating and boosting unit for heating and increasing the pressure of the accumulator space, a pressure rise delay unit for delaying an increase in pressure of the accumulator space is provided. The pressure rise delay means is provided at least in part of the upstream gas flow path, and is heated by arc energy induced from the arc space to generate a gas released by ablation. A gas circuit breaker comprising an adherend for closing at least a part of the upstream gas flow path by the released gas. 3. A sealed container filled with an arc-extinguishing gas,
A first contact portion and a second contact portion having a first arc contact and a second arc contact which can be brought into contact with and separated from each other by relative movement are arranged to face each other, and the first arc contact and the second contact are provided.
An arc space in which an arc is generated when the arc contact is opened is provided between the arc contacts, and a gas flow generating means for extinguishing the arc includes at least one pressure accumulating space and a pressure increase for increasing the pressure of the pressure accumulating space. Means, at least one upstream gas flow path connecting the pressure accumulating space and the arc space, and at least one downstream side connecting the arc space and a downstream space which is a space having the same pressure as the filling pressure in the closed vessel. A gas flow path configured by a gas flow path, wherein the pressure increasing unit is configured by at least one of a mechanical compression unit that compresses the pressure accumulation space and a heating pressure increasing unit that heats and pressures the pressure accumulation space. A pressure-rise delay unit that delays a pressure rise in the pressure accumulation space, wherein the pressure-rise delay unit includes at least a part of the inside of the pressure accumulation space and the The discharge gas is provided in at least a part of the inside of the flow-side gas flow path, and is heated by arc energy induced from the arc space to generate a discharge gas by ablation. A gas flow in the pressure accumulating space is a mixed gas of the arc-extinguishing gas and the released gas. 4. The gas circuit breaker according to claim 1, wherein the adhered portion is made of an organic polymer compound having a melting point of 400 ° C. or lower. 5. The deposition section according to claim 1, wherein the released gas has a molecular weight of 8
The gas circuit breaker according to any one of claims 1 to 4, wherein the gas circuit breaker is made of an organic polymer compound that becomes a pyrolysis gas of 0 or less. 6. The apparatus according to claim 1, wherein the adherend comprises a plurality of organic compounds having different melting points.
6. The gas circuit breaker according to any one of items 5 to 5. 7. The pressure accumulating space has a first pressure accumulating chamber whose pressure is increased by the mechanical compression means, and a second pressure accumulating chamber whose pressure is increased by the heating / pressure increasing means. 7. The gas circuit breaker according to claim 6. 8. The pressure accumulating space is constituted by a movable cylinder and a fixed piston that move relative to each other in conjunction with the opening operation, and the adherend is provided on the fixed piston. 2. The gas circuit breaker according to 1. 9. The attaching portion is attached so that the volume of the accumulating space or the upstream gas flow path is kept constant during the opening operation even if the volume of the attaching portion is reduced by ablation. The gas circuit breaker according to claim 1, further comprising a biasing elastic body. 10. The apparatus according to claim 1, wherein the adhered portion is formed of a coating layer applied to an inner surface of the pressure accumulating space or at least a part of the upstream gas flow path. The described gas circuit breaker. 11. The gas circuit breaker according to claim 2, wherein at least a part of the member constituting the upstream gas flow path is constituted by the adhered portion. 12. The gas circuit breaker according to claim 1, further comprising a pressure releasing unit that opens when a pressure becomes equal to or higher than a predetermined value in the pressure accumulation space. 13. The pressure accumulating space is constituted by a movable cylinder and a piston portion that relatively move in conjunction with an opening operation, wherein the piston portion has a fixed member and a floating piston, and the fixed member and the floating piston. The gas circuit breaker according to any one of claims 1 to 12, wherein the gas circuit breakers are connected by an elastic body having a natural length at the beginning of the opening operation. 14. The pressure accumulating space is constituted by a movable cylinder and a piston portion which operate relative to each other in conjunction with the opening operation, wherein the volume of the accumulating space before the start of the opening operation is Vo, and the volume after the opening operation is completed. The volume of the pressure accumulating space is defined as Ve, and is set so that Ve ≧ 1/3 (Vo−Ve).
The gas circuit breaker according to any one of claims 13 to 13. 15. The gas circuit breaker according to claim 1, further comprising detection means for detecting a remaining amount of the adhered portion.