JP2007035518A - Gas circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a ground fault and a phase-to-phase short circuit, and suppress upsizing of a gas tank by enabling to efficiently and sufficiently cool heated gas generated in shut-down of the large amount of current by a compact constitution. <P>SOLUTION: An exhaust structure part 100 to cool the heated gas generated in shut-down of the large amount of current is constituted of a nearly cylindrical first exhaust cylinder 101 and a nearly cylindrical second exhaust cylinder 102 having a nearly cylindrical main body part and a bottom plate part having a larger inner diameter than the outer diameter of the first exhaust cylinder. The first exhaust cylinder is mounted on the terminal end of a fixed part 3b of an arc-extinguishing chamber 3, and the second exhaust cylinder is concentrically arranged with the first exhaust cylinder so that the main body surrounds the outer periphery of the first exhaust cylinder via a gap part and that the bottom plate part is arranged nearly concentrically with the first exhaust cylinder for the purpose of not being contacted with the terminal end of the first exhaust cylinder. A cross sectional area of the gap between the two exhaust cylinders is made larger than an inner cross sectional area of the first exhaust cylinder. A metallic supporting structure 103 supports the second exhaust cylinder at the same electric potential with that of the first exhaust cylinder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas circuit breaker that cuts off a current in a power transmission and distribution system, and more particularly, to a gas circuit breaker that prevents a ground fault and a short circuit between phases due to a decrease in insulation performance caused by exhaust heat gas generated when a large current is cut off. .

  In a power transmission / distribution system, a puffer type gas circuit breaker has been conventionally employed as a gas circuit breaker that cuts off a large current. The puffer-type gas circuit breaker includes an exhaust pipe for cooling the hot gas generated when a large current is interrupted (see, for example, Patent Documents 1 and 2).

  18 and 19 are schematic cross-sectional views showing the closed state and the open state of this type of puffer type gas circuit breaker, respectively. The tank-type puffer-type gas circuit breaker shown in FIGS. 18 and 19 is configured by hermetically sealing an insulating gas 2 and an arc extinguishing chamber 3 in a gas tank 1. The gas tank 1 has a main body portion that houses the arc extinguishing chamber 3 in a substantially coaxial direction and a flat plate portion that closes one end thereof. The arc extinguishing chamber 3 is composed of a movable part 3a and a fixed part 3b that are arranged to face each other, and an interelectrode support insulating cylinder 3c that insulates and supports the movable part 3a and the fixed part 3b. Details of each part are as follows.

  The movable portion 3a of the arc extinguishing chamber 3 drives the movable contact portion 3d and the movable contact portion 3d including the puffer cylinder 11 and the nozzle 12 fixed thereto, the movable side arc contact 13 and the movable side main contact 14. The operation rod 15, a puffer piston 21 that is in sliding contact with the puffer cylinder 11, and a movable support 22 that supports the puffer piston 21. The movable support 22 slides and supports the movable contact portion 3d and is electrically connected in series with the movable contact portion 3d.

  The fixed portion 3b of the arc extinguishing chamber 3 is composed of a fixed-side arc contact 31, a fixed-side main contact 32, and a fixed support 33 that supports them, and the end of the fixed portion 3b (the side opposite to the movable portion 3a). The exhaust pipe 34 is attached in a substantially coaxial direction to cool the hot gas generated in the arc extinguishing chamber 3 when a large current is interrupted and discharge it into the gas tank 1.

  Further, the gas tank 1 is provided with at least two conductor lead portions 4, and from each conductor lead portion 4, a movable side connection conductor (not shown) for electrically connecting the movable portion 3a to an external circuit, and a fixed portion 3b. Each of the fixed-side connection conductors 5 that electrically connect the external circuit to the external circuit is taken out.

  The gas circuit breaker shown in FIGS. 18 and 19 performs the breaking operation from the closed state as shown in FIG. 18 and reaches the open state as shown in FIG. When a large current is interrupted, the insulating gas 2 blown from the puffer cylinder 11 through the nozzle 12 is heated by the arc generated between the movable arc contact 13 and the fixed arc contact 31 to become a hot gas, and the hot gas is fixed. After being cooled to some extent in the exhaust pipe 34 disposed in the portion 3 b, the gas is exhausted into the gas tank 1.

JP2002-298709 JP 2003-157753 A

  By the way, the insulation performance of the hot gas generated at the time of interruption is extremely lower than that at the normal time. If the hot gas is released into the gas tank at a high temperature, it causes a ground fault. In addition, when the conductor lead-out part on the fixed side of the circuit breaker is arranged on the terminal flat plate of the gas tank, the direction in which the hot gas is exhausted coincides with the direction of the conductor lead-out part where the electric field strength on the gas tank surface increases. Therefore, the possibility of a ground fault is further increased.

  In a three-phase batch tank type gas circuit breaker in which the arc extinguishing chamber for three phases is hermetically sealed in the gas tank together with the insulating gas, if the hot gas is released into the gas tank without being sufficiently cooled, only the ground fault There is a risk of short-circuiting between phases. In order to avoid such ground faults and short circuits between phases, it is necessary to cool the hot gas sufficiently and recover the insulation performance before releasing it into the gas tank. Therefore, it is necessary to make the volume of the part where the hot gas in the gas tank is released sufficiently large so that the exhaust pipe is lengthened or the ground fault and the short circuit between phases do not occur even if the cooling in the exhaust pipe is insufficient. This was the cause of the increase in size of the gas tank.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to enable efficient and sufficient cooling of the hot gas generated when a large current is interrupted with a compact configuration. By this, it is providing the gas circuit breaker which can prevent a ground fault and a short circuit between phases, and can suppress the enlargement of a gas tank.

  In order to achieve the above-mentioned object, the present invention comprises a first and second exhaust pipes that are arranged substantially concentrically as the exhaust structure part that cools the hot gas generated when a large current is interrupted. A length obtained by adding the length of both exhaust pipes without forming an exhaust flow path from the inside of one exhaust pipe to the gap between the first and second exhaust pipes, and making the exhaust structure part straight. This achieves the same high cooling capacity as the exhaust pipe.

  The gas circuit breaker of the present invention cools the hot gas generated in the arc extinguishing chamber when the large current is interrupted, and the arc extinguishing chamber in which the fixed portion and the movable portion are arranged opposite to each other inside the container filled with the insulating gas. In a gas circuit breaker having an exhaust structure that discharges to a fixed circuit and a fixed-side connecting conductor that connects the fixed part of the arc extinguishing chamber to an external circuit is taken out from a fixed-side conductor lead-out part arranged in a part of the container. The part is composed of the following first and second exhaust pipes.

  That is, of the fixed part of the arc extinguishing chamber, when the end on the side facing the movable part is defined as the front end, and the end on the opposite side is defined as the end, the exhaust structure part is a substantially cylindrical first exhaust pipe. The second exhaust pipe has a substantially cylindrical main body part having an inner diameter larger than the outer diameter of the first exhaust pipe and a bottom plate part closing one end thereof. The first exhaust pipe is attached to the end of the fixed part of the arc extinguishing chamber in a substantially coaxial direction. The second exhaust pipe is substantially the same as the first exhaust pipe so that the main body portion surrounds the outer periphery of the first exhaust pipe through the gap portion, and the bottom plate portion is in a positional relationship that does not contact the terminal end of the first exhaust pipe. It is arranged concentrically. The first exhaust pipe and the second exhaust pipe have a dimensional relationship such that the cross-sectional area of the gap portion on the cross-section perpendicular to the axial direction of the two exhaust pipes is larger than the internal cross-sectional area of the first exhaust pipe. Is done.

  According to the present invention having the above-described features, the hot gas generated when the gas circuit breaker interrupts a large current is generated in the first exhaust pipe, the first exhaust pipe, and the second by the pressure gradient inside the exhaust structure. It passes through the gap of the exhaust pipe and is discharged into the gas tank. In this case, since the exhaust gas channel length of the hot gas is substantially equivalent to the distance obtained by adding the lengths of the first exhaust cylinder and the second exhaust cylinder, the cooling capacity of the exhaust cylinder is equal to the first exhaust cylinder and the second exhaust cylinder. This is equivalent to the length of the exhaust cylinder plus the length of the cylinder.

  Therefore, the hot gas can be efficiently and sufficiently cooled without lengthening the exhaust structure portion in a straight line, and can be discharged into the gas tank after the insulation performance of the hot gas is restored. Furthermore, since the cross-sectional area of the gap between the second exhaust pipe and the first exhaust pipe is made larger than the internal cross-sectional area of the first exhaust pipe, the hot gas is not blocked in the exhaust structure.

  As described above, according to the present invention, due to the characteristics of the structure of the exhaust structure, the hot gas generated when a large current is interrupted can be efficiently and sufficiently cooled, the insulation performance can be recovered, and the ground fault can be prevented. Since the length of the exhaust structure portion can be suppressed to the minimum necessary, the size of the gas tank can be suppressed to the minimum necessary.

  According to the present invention, a gas cutoff capable of preventing a ground fault or a short circuit between phases and suppressing an increase in size of a gas tank by enabling efficient and sufficient cooling of a hot gas generated when a large current is interrupted in a compact configuration. Can be provided.

[First Embodiment]
FIG. 1 is a schematic cross-sectional view showing a gas circuit breaker according to a first embodiment to which the present invention is applied. In addition, the same code | symbol is attached | subjected to the same part as the prior art shown in FIG. 18 and FIG. 19, and description is abbreviate | omitted.

  In this embodiment, as shown in FIG. 1, when the fixed-side conductor lead-out portion 4 is disposed on the side of the main barrel portion of the gas tank 1, the fixed side that connects the fixed portion 3 b of the arc extinguishing chamber 3 to an external circuit. The connection conductor 5 is attached to the fixed support 33 in the same manner as the prior art shown in FIGS. The feature of this embodiment is that the exhaust structure 100 that cools the hot gas generated in the arc-extinguishing chamber 3 when large current is interrupted and discharges it into the gas tank 1 is not a single exhaust pipe but a substantially cylindrical first exhaust. The cylinder 101, and a substantially cylindrical second exhaust cylinder 102 having a substantially cylindrical main body portion having an inner diameter larger than the outer diameter of the first exhaust cylinder 101 and a bottom plate portion closing one end thereof. is there. The details of the first and second exhaust pipes 101 and 102 are as follows.

  The first exhaust pipe 101 is attached to the end of the fixed part 3b of the arc extinguishing chamber 3 (the end opposite to the movable part 3a). The second exhaust cylinder 102 has a positional relationship in which the substantially cylindrical main body portion surrounds the outer periphery of the first exhaust cylinder 101 through the gap portion, and the bottom plate portion does not contact the terminal end of the first exhaust cylinder 101. The first exhaust pipe 101 is arranged so as to be concentric. Further, the first exhaust cylinder 101 and the second exhaust cylinder 102 have a cross-sectional area of an annular gap portion between the exhaust cylinders 101 and 102 on an axial orthogonal cross section orthogonal to the axial direction of the two exhaust cylinders 101 and 102. The dimensional relationship is such that it is larger than the internal cross-sectional area of one exhaust cylinder 101.

  Further, a metal support structure 103 that supports the second exhaust cylinder 102 with respect to the first exhaust cylinder 101 is provided, and the first exhaust cylinder 101 and the second exhaust cylinder 102 are provided by the metal support structure 103. Are at the same potential.

  In the gas circuit breaker according to the first embodiment having the above-described configuration, the hot gas generated when a large current is interrupted is generated inside the first exhaust pipe 101 and the first exhaust pipe due to the pressure gradient inside the exhaust structure 100. The gas passes through the annular gap between 101 and the second exhaust cylinder 102 and is discharged into the gas tank 1. In this case, since the exhaust gas channel length of the hot gas is substantially equivalent to the distance obtained by adding the lengths of the first exhaust cylinder 101 and the second exhaust cylinder 102, the cooling capacity of the exhaust cylinder is the same as that of the first exhaust cylinder 101. This is equivalent to an exhaust cylinder having a length obtained by adding the length of the second exhaust cylinder 102.

  Therefore, the hot gas can be efficiently and sufficiently cooled without elongating the exhaust structure 100 in a straight line, and can be discharged into the gas tank 1 after the insulation performance of the hot gas is restored. Further, since the cross-sectional area of the annular gap between the second exhaust cylinder 102 and the first exhaust cylinder 101 is larger than the internal cross-sectional area of the first exhaust cylinder 101, the hot gas is blocked in the exhaust structure section 100. Does not occur.

  As described above, according to the first embodiment, the configuration of the exhaust structure portion can efficiently and sufficiently cool the hot gas generated at the time of interrupting a large current, recover the insulation performance, and prevent a ground fault. And since the length of an exhaust structure part can be suppressed to the required minimum, the magnitude | size of a gas tank can be suppressed to the required minimum.

[Second Embodiment]
FIG. 2 is a schematic cross-sectional view showing a gas circuit breaker according to a second embodiment to which the present invention is applied. FIG. 3 is a schematic cross-sectional view showing a cross section taken along line AA in FIG. 2, and is a view showing a positional relationship between the exhaust pipes 101 and 102 and the conductor lead-out portion 4 on the fixed side of the gas tank 1.

  In the present embodiment, as shown in FIG. 3, a part of the configuration of the gas circuit breaker of the first embodiment is changed as follows. That is, at least one of the cross-sectional shapes of the inner surface and the outer surface of the main body portion of the second exhaust cylinder 102 on the axial orthogonal cross section orthogonal to the axial direction of the second exhaust cylinder 102 is at one or more locations. There is an inner protrusion 102 a that narrows the gap between the first exhaust pipe 101. In the drawing, as an example, a case where only one inner projecting portion 102 a is provided in the main body portion of the second exhaust pipe 102 is shown.

  In the second exhaust cylinder 102, one direction of the inner projecting portion 102 a provided on the main body portion substantially coincides with the direction of the fixed-side conductor lead-out portion 4 disposed on the side surface of the main trunk portion of the gas tank 1. Are arranged as follows. The configuration of other parts is the same as that of the first embodiment.

  In the gas circuit breaker according to the second embodiment having the above-described configuration, the direction of the conductor lead-out portion 4 on the fixed side of the surface of the gas tank 1 increases in electric field strength, but the same direction in the second exhaust cylinder 102. Since the exhaust gas flow path is narrowed and the hot gas generated when a large current is interrupted is hardly discharged in the same direction, the possibility of a ground fault is further reduced as compared with the gas circuit breaker of the first embodiment. Can do.

[Third Embodiment]
FIG. 4 is a schematic cross-sectional view showing a gas circuit breaker according to a third embodiment to which the present invention is applied. FIG. 5 is a schematic cross-sectional view showing a cross section taken along line AA in FIG. 4, and is a view showing a positional relationship between the exhaust tubes 101 and 102 and the conductor lead-out portion 4 on the fixed side of the gas tank 1.

  In this embodiment, as shown in FIG. 5, a part of the configuration of the gas circuit breaker of the first embodiment is changed as follows. That is, among the cross-sectional shapes of the inner surface and the outer surface of the main body portion of the second exhaust cylinder 102 on the axial orthogonal cross section orthogonal to the axial direction of the substantially cylindrical second exhaust cylinder 102, at least the cross-sectional shape of the inner surface is substantially elliptical. It is said that. The second exhaust cylinder 102 is disposed such that the substantially elliptical short axis direction of the inner surface thereof substantially coincides with the direction of the fixed-side conductor lead-out portion 4 disposed on the side surface of the main body portion of the gas tank 1. Yes. The configuration of other parts is the same as that of the first embodiment.

  In the gas circuit breaker of the third embodiment having the above-described configuration, the exhaust flow path in the same direction in the second exhaust cylinder 102 with respect to the direction of the conductor outlet 4 where the electric field strength on the surface of the gas tank 1 increases. Since the hot gas generated when a large current is interrupted is hardly discharged in the same direction, a ground fault is possible even more than the gas circuit breaker of the first embodiment, as in the second embodiment. Can be lowered.

[Fourth Embodiment]
FIG. 6 is a schematic cross-sectional view showing a gas circuit breaker according to a fourth embodiment to which the present invention is applied.

  In this embodiment, as shown in FIG. 6, a part of the configuration of the gas circuit breaker of the first embodiment is changed as follows. That is, the first exhaust cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 that supports them are configured to have a sufficient thickness to pass the rated current of the gas circuit breaker. . The fixed-side connection conductor 5 that connects the fixed portion 3b to the external circuit is attached to the outer surface of the second exhaust cylinder 102.

  The second exhaust cylinder 102 has a substantially cylindrical main body portion that overlaps with the fixed-side conductor lead-out portion 4 of the gas tank 1, and an open end portion of the main-body portion does not overlap with the fixed-side conductor lead-out portion 4. Is arranged. That is, the conductor lead-out portion 4 on the fixed side of the gas tank 1 is configured to be located upstream of the exhaust passage outlet of the second exhaust cylinder 102. The configuration of other parts is the same as that of the first embodiment.

  In the gas circuit breaker according to the fourth embodiment having the above-described configuration, the arrangement relationship between the first and second exhaust pipes 101 and 102, the fixed-side conductor lead-out portion 4, and the fixed-side connection conductor 5 is devised. As a result, the hot gas generated at the time of interrupting a large current is hardly discharged in the direction of the conductor lead-out portion 4 where the electric field strength on the surface of the gas tank 1 is increased. Therefore, as in the second and third embodiments, The possibility of a ground fault can be further reduced as compared with the gas circuit breaker of the embodiment. Therefore, the same effects as those of the second and third embodiments can be obtained without making the shape of the second exhaust cylinder 102 complicated.

[Fifth Embodiment]
FIG. 7 is a schematic cross-sectional view showing a gas circuit breaker according to a fifth embodiment to which the present invention is applied.

  In the present embodiment, as shown in FIG. 7, a part of the configuration of the gas circuit breaker of the first embodiment is changed as follows. That is, the second exhaust cylinder 102 is not supported at the same potential by the metal support structure 103 with respect to the first exhaust cylinder 101 but is insulated and supported by the insulating support structure 104 with respect to the flat plate portion of the gas tank 1. The first exhaust cylinder 101 and the second exhaust cylinder 102 are electrically separated. The configuration of other parts is the same as that of the first embodiment.

  In the gas circuit breaker according to the fifth embodiment having the above-described configuration, the second exhaust cylinder 102 is in an electrically floating state, and has a substantially intermediate potential between the ground potential and the fixed portion 3b. The potential difference between the second exhaust cylinder 102 and the gas tank 1 is alleviated. Therefore, the possibility of a ground fault can be further reduced as compared with the gas circuit breaker of the first embodiment.

[Sixth Embodiment]
FIG. 8 is a schematic cross-sectional view showing a gas circuit breaker according to a sixth embodiment to which the present invention is applied.

  In the present embodiment, as shown in FIG. 8, a part of the configuration of the gas circuit breaker according to the first embodiment is changed as follows. That is, when the conductor lead portion 4 on the fixed side is disposed on a flat plate portion that closes one end of the gas tank 1, the first exhaust cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 that supports them are: The gas circuit breaker is configured to have a sufficient thickness to pass the rated current. Further, the fixed-side connection conductor 5 that connects the fixed portion 3 b to the external circuit is attached to the bottom plate portion of the second exhaust cylinder 102. The configuration of other parts is the same as that of the first embodiment.

  In the gas circuit breaker according to the sixth embodiment having the above-described configuration, the hot gas generated when a large current is interrupted is hardly discharged in the direction of the conductor lead-out portion 4 where the electric field strength on the surface of the gas tank 1 increases. Like the fourth embodiment, the possibility of a ground fault can be further reduced as compared with the gas circuit breaker of the first embodiment without making the shape of the second exhaust cylinder 102 complicated. Accordingly, when the fixed-side conductor lead-out portion 4 is disposed not on the side surface of the main body portion of the gas tank 1 but on the flat plate portion, the same effect as in the fourth embodiment can be obtained.

[Seventh Embodiment]
FIG. 9 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to a seventh embodiment to which the present invention is applied. FIG. 10 is a schematic cross-sectional view showing a cross section taken along line AA in FIG. 9, and is a view showing a positional relationship between the exhaust pipes 101 and 102 for three phases and the main body portion of the gas tank 1.

  In the present embodiment, as shown in FIG. 9, among the three-phase batch tank type gas circuit breaker in which the arc extinguishing chamber 3 for three phases is hermetically sealed together with the insulating gas 2 in one gas tank 1, the conductor on the fixed side is particularly preferred. When the outlet 4 is arranged on the side of the main barrel portion of the gas tank 1, the exhaust structure of the arc extinguishing chamber 3 for each phase is the same as in the first embodiment. The exhaust structure 100 is composed of cylinders 101 and 102.

  In this embodiment, the fixed-side connection conductors 5 that connect the fixing portions 3b of the arc-extinguishing chambers 3 of the respective phases to the external circuit are all attached to the fixed support 33 of the arc-extinguishing chambers 3 of the respective phases. It is taken out from the conductor lead portion 4 on the fixed side arranged on the side surface of the main trunk portion.

  In the three-phase collective tank type gas circuit breaker of the seventh embodiment having the above-described configuration, the exhaust structure portion of each phase is composed of the first and second exhaust pipes similar to the first embodiment. By adopting a configuration, the hot gas generated when a large current is interrupted can be efficiently and sufficiently cooled, the insulation performance can be recovered, ground faults and interphase short-circuits can be prevented, and the length of the exhaust structure is minimized. Therefore, the size of the gas tank can be minimized.

[Eighth Embodiment]
FIG. 11 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to an eighth embodiment to which the present invention is applied.

  In the present embodiment, as shown in FIG. 11, a part of the configuration of the three-phase batch tank type gas circuit breaker of the seventh embodiment is changed as follows. That is, in the exhaust structure 100 of each phase, the first exhaust cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 that supports them have sufficient thickness to pass the rated current of the gas circuit breaker. It is configured to have a thickness. The fixed-side connection conductor 5 that connects the fixed portion 3b of the arc extinguishing chamber 3 of each phase to an external circuit is attached to the outer surface of the second exhaust cylinder 102 of each phase.

  Further, the second exhaust cylinder 102 constituting the exhaust structure portion 100 of each phase has a substantially cylindrical main body portion overlapping with the conductor lead-out portion 4 on the fixed side of the gas tank 1, and an open end portion of the main body portion is fixed. It arrange | positions so that it may not overlap with the conductor extraction part 4 of the side. That is, the conductor lead-out portion 4 on the fixed side of the gas tank 1 is configured to be located upstream of the exhaust passage outlet of the second exhaust cylinder 102. The configuration of other parts is the same as that of the seventh embodiment.

  In the three-phase collective tank type gas circuit breaker having the above-described configuration, the hot gas generated when the large current is interrupted is directed toward the conductor outlet 4 where the electric field strength on the surface of the gas tank 1 increases. Is hardly discharged, the possibility of a ground fault can be further reduced as compared with the three-phase batch tank type gas circuit breaker of the seventh embodiment.

[Ninth Embodiment]
FIG. 12 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to a ninth embodiment to which the present invention is applied.

  In this embodiment, as shown in FIG. 12, a part of the configuration of the three-phase batch tank type gas circuit breaker of the seventh embodiment is changed as follows. That is, in the exhaust structure portion 100 of each phase, the second exhaust cylinder 102 is not supported at the same potential by the metal support structure 103 with respect to the first exhaust cylinder 101, but to the flat plate portion of the gas tank 1. The first exhaust cylinder 101 and the second exhaust cylinder 102 are electrically separated from each other by the insulating support structure 104. The configuration of other parts is the same as that of the seventh embodiment.

  In the gas circuit breaker of the ninth embodiment having the above-described configuration, the second exhaust cylinder 102 constituting the exhaust structure portion 100 of each phase is in an electrically floating state, and the ground potential and the fixed portion 3b Since the potential is substantially in the middle of the potential, the potential difference between the second exhaust cylinder 102 and the gas tank 1 and the potential difference between the different-phase second exhaust cylinders 102 are alleviated. Therefore, the possibility of a ground fault and a short circuit between phases can be further reduced as compared with the three-phase batch tank type gas circuit breaker of the seventh embodiment.

[Tenth embodiment]
FIG. 13 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to a tenth embodiment to which the present invention is applied.

  In this embodiment, as shown in FIG. 13, a part of the configuration of the three-phase batch tank type gas circuit breaker of the seventh embodiment is changed as follows. That is, when the fixed-side conductor lead-out portion 4 for taking out the three-phase fixed-side connection conductor 5 is disposed on a flat plate portion that closes one end of the gas tank 1, the first exhaust in the exhaust structure portion 100 of each phase. The cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 that supports them are configured to have a sufficient thickness so as to pass the rated current of the gas circuit breaker. Furthermore, the fixed-side connection conductor 5 that connects the fixed portion 3b of the arc extinguishing chamber 3 of each phase to an external circuit is attached to the bottom plate portion of the second exhaust cylinder 102 of each phase. The configuration of other parts is the same as that of the seventh embodiment.

  In the three-phase collective tank type gas circuit breaker of the tenth embodiment having the above-described configuration, the hot gas generated at the time of large current interruption is directed in the direction of the conductor outlet 4 where the electric field strength on the surface of the gas tank 1 increases. Since it is hardly discharged | emitted, possibility of a ground fault can be made still lower than the three-phase collective tank type gas circuit breaker of 7th Embodiment similarly to 8th Embodiment. Therefore, when the fixed-side conductor lead-out portion 4 is arranged not on the side surface of the main body portion of the gas tank 1 but on the flat plate portion, the same effect as that of the eighth embodiment can be obtained.

[Eleventh embodiment]
FIG. 14 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to an eleventh embodiment to which the present invention is applied. FIG. 15 is a schematic cross-sectional view showing a cross section taken along line AA in FIG. 14, and is a view showing a positional relationship between the exhaust pipes 101 and 102 for three phases and the main body portion of the gas tank 1.

  In this embodiment, as shown in FIG. 15, a part of the configuration of the three-phase batch tank type gas circuit breaker of the seventh embodiment is changed as follows. That is, in the exhaust structure portion 100 of each phase, at least the cross-sectional shape of the inner surface among the cross-sectional shapes of the inner surface and the outer surface of the main body portion of the second exhaust tube 102 on the axial orthogonal cross section orthogonal to the axial direction of the second exhaust tube 102. Is substantially elliptical. In the second exhaust cylinder 102, the substantially elliptical short axis direction of the inner surface thereof substantially coincides with the linear direction connecting the central axis of the arc extinguishing chamber 3 and the central axis of the gas tank 1 on the cross section perpendicular to the axis. Are arranged to be. The configuration of other parts is the same as that of the seventh embodiment.

  In the three-phase collective tank type gas circuit breaker of the eleventh embodiment having the above-described configuration, the hot gas generated when a large current is interrupted is generated between the gas tank 1 and the arc extinguishing chamber 3 of each phase, and the different phase arc extinguishing. Since the electric field strength between the chambers 3 is hardly discharged to the portion where the electric field strength is highest, the effect of preventing the ground fault and the short circuit between the phases can be further increased than the three-phase batch tank type gas circuit breaker of the seventh embodiment, The length of the exhaust structure and the size of the gas tank can be further suppressed.

[Twelfth embodiment]
FIG. 16 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to a twelfth embodiment to which the present invention is applied. The present embodiment is a modification in which the eighth and eleventh embodiments are combined.

  That is, in the exhaust structure 100 of each phase, the first exhaust cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 are configured to pass the rated current of the gas circuit breaker, The fixed-side connection conductor 5 is attached to the outer surface of the second exhaust cylinder 102 of each phase, and the fixed-side conductor lead-out portion 4 of the gas tank 1 is disposed upstream of the exhaust passage outlet of the second exhaust cylinder 102. This is the same as in the eighth embodiment.

  Further, the cross-sectional shape of the inner surface of the second exhaust cylinder 102 is substantially elliptical, and the short axis direction is a linear direction connecting the central axis of the arc extinguishing chamber 3 of the phase and the central axis of the gas tank 1. Is substantially the same as that of the eleventh embodiment. That is, the AA line cross section in FIG. 16 is the same as FIG.

  According to the three-phase collective tank type gas circuit breaker of the twelfth embodiment having the above configuration, the effects of the eighth and eleventh embodiments can be obtained synergistically.

[Thirteenth embodiment]
FIG. 17 is a schematic cross-sectional view showing a three-phase batch tank type gas circuit breaker according to a thirteenth embodiment to which the present invention is applied. This embodiment is a modified example in which the tenth and eleventh embodiments are combined.

  That is, when the fixed-side conductor lead-out portion 4 for taking out the three-phase fixed-side connection conductor 5 is disposed on a flat plate portion that closes one end of the gas tank 1, the first exhaust in the exhaust structure portion 100 of each phase. The cylinder 101, the second exhaust cylinder 102, and the metal support structure 103 are configured to pass the rated current of the gas circuit breaker, and the fixed-side connection conductor 5 of each phase is the first of each phase. The point attached to the bottom plate portion of the two exhaust cylinders 102 is the same as in the tenth embodiment.

  Further, the cross-sectional shape of the inner surface of the second exhaust cylinder 102 is substantially elliptical, and the short axis direction is a linear direction connecting the central axis of the arc extinguishing chamber 3 of the phase and the central axis of the gas tank 1. Is substantially the same as that of the eleventh embodiment. That is, the AA line cross section in FIG. 16 is the same as FIG.

  According to the three-phase collective tank type gas circuit breaker of the thirteenth embodiment having the above-described configuration, when the fixed-side conductor lead-out portion 4 is disposed not on the main body portion side surface of the gas tank 1 but on the flat plate portion. The effects of the tenth and eleventh embodiments can be obtained synergistically.

[Other Embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and various other variations can be implemented within the scope of the present invention. For example, the specific cross-sectional shape of the second exhaust pipe can be freely changed, and the specific dimensional ratio between the second exhaust pipe and the first exhaust pipe can be freely selected.

The typical sectional view showing the gas circuit breaker concerning a 1st embodiment to which the present invention is applied. The typical sectional view showing the gas circuit breaker concerning a 2nd embodiment to which the present invention is applied. Typical sectional drawing which shows the AA line cross section in FIG. The typical sectional view showing the gas circuit breaker concerning a 3rd embodiment to which the present invention is applied. Typical sectional drawing which shows the AA line cross section in FIG. The typical sectional view showing the gas circuit breaker concerning a 4th embodiment to which the present invention is applied. The typical sectional view showing the gas circuit breaker concerning a 5th embodiment to which the present invention is applied. The typical sectional view showing the gas circuit breaker concerning a 6th embodiment to which the present invention is applied. The typical sectional view showing the gas circuit breaker concerning a 7th embodiment to which the present invention is applied. Typical sectional drawing which shows the AA line cross section in FIG. A typical sectional view showing a gas circuit breaker concerning an 8th embodiment to which the present invention is applied. A typical sectional view showing a gas circuit breaker concerning a 9th embodiment to which the present invention is applied. A typical sectional view showing a gas circuit breaker concerning a 10th embodiment to which the present invention is applied. A typical sectional view showing a gas circuit breaker concerning an 11th embodiment to which the present invention is applied. The typical sectional view showing the AA line section in FIG. A typical sectional view showing a gas circuit breaker concerning a 12th embodiment to which the present invention is applied. A typical sectional view showing a gas circuit breaker concerning a 13th embodiment to which the present invention is applied. Typical sectional drawing which shows the closed circuit state of the conventional gas circuit breaker. The typical sectional view showing the open circuit state of the gas circuit breaker of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas tank 2 ... Insulating gas 3 ... Arc extinguishing chamber 3a ... Movable part 3b ... Fixed part 3c ... Interpolar support insulation cylinder 3d ... Movable contact part 4 ... Conductor lead-out part 5 ... Fixed side connection conductor 11 ... Puffer cylinder 12 ... Nozzle DESCRIPTION OF SYMBOLS 13 ... Movable side arc contact 14 ... Movable side main contact 15 ... Operation rod 21 ... Puffer piston 22 ... Movable support 31 ... Fixed side arc contact 32 ... Fixed side main contact 33 ... Fixed support 34 ... Exhaust pipe 100 ... Exhaust structure 101 ... first exhaust cylinder 102 ... second exhaust cylinder 102a ... inner protrusion 103 ... metal support structure 104 ... insulation support structure

Claims (11)

An arc extinguishing chamber with a fixed part and a movable part facing each other inside a container filled with an insulating gas, and an exhaust structure that cools and discharges the hot gas generated in the arc extinguishing chamber when a large current is interrupted. In the gas circuit breaker in which the fixed-side connection conductor for connecting the fixed part of the arc extinguishing chamber to the external circuit is taken out from the fixed-side conductor lead-out part arranged in a part of the container,
Of the fixed part of the arc-extinguishing chamber, when defining the end on the side facing the movable part as the tip, and the end on the opposite side as the end,
The exhaust structure portion includes a substantially cylindrical first exhaust pipe, a substantially cylindrical main body portion having an inner diameter larger than the outer diameter of the first exhaust pipe, and a second exhaust pipe having a bottom plate portion closing one end thereof. Configured,
The first exhaust pipe is attached in a substantially coaxial direction to the end of the fixed part of the arc-extinguishing chamber,
The second exhaust pipe is positioned so that the main body portion surrounds the outer periphery of the first exhaust pipe through a gap portion, and the bottom plate portion is in a positional relationship that does not contact the terminal end of the first exhaust pipe. It is arranged almost concentrically with one exhaust pipe,
In the first exhaust pipe and the second exhaust pipe, the cross-sectional area of the gap portion on the cross section perpendicular to the axial direction of the two exhaust pipes is larger than the internal cross-sectional area of the first exhaust pipe. A gas circuit breaker characterized by being dimensionally related. The container has a main body portion that houses the arc extinguishing chamber in a substantially coaxial direction,
The fixed-side conductor lead-out portion is disposed on a side surface of the main trunk portion of the container,
The cross-sectional shape of the inner surface of the main body portion of the second exhaust pipe on the cross section orthogonal to the axial direction of the second exhaust pipe is an inward protrusion that narrows the gap between the first exhaust pipe and at least one place. 2. The second exhaust pipe according to claim 1, wherein the second exhaust pipe is disposed such that one direction of the inner projecting portion substantially coincides with a direction of the conductor lead-out portion on the fixed side. Gas circuit breaker. The container has a main body portion that houses the arc extinguishing chamber in a substantially coaxial direction,
The fixed-side conductor lead-out portion is disposed on a side surface of the main trunk portion of the container,
The cross-sectional shape of the inner surface of the main body portion of the second exhaust pipe on the cross-axis orthogonal to the axial direction of the second exhaust pipe is substantially elliptical, and the second exhaust pipe has a short axis of the substantially elliptical shape. 2. The gas circuit breaker according to claim 1, wherein the gas circuit breaker is disposed so that a direction thereof substantially coincides with a direction of the conductor lead-out portion on the fixed side. A metal support structure for supporting the second exhaust pipe at the same potential with respect to the first exhaust pipe;
The first exhaust pipe, the second exhaust pipe, and the metal support structure are configured to have a sufficient thickness to pass the rated current of the gas circuit breaker,
The container has a main body portion that houses the arc extinguishing chamber in a substantially coaxial direction,
The fixed-side conductor lead-out portion is disposed on a side surface of the main trunk portion of the container,
The second exhaust pipe is arranged so that the main body portion overlaps the conductor lead-out portion on the fixed side, and the opening end portion of the main body portion does not overlap the conductor lead-out portion,
4. The gas circuit breaker according to claim 1, wherein the fixed-side connection conductor is attached to an outer surface of the substantially cylindrical main body portion of the second exhaust pipe. 5. A metal support structure for supporting the second exhaust pipe at the same potential with respect to the first exhaust pipe;
The first exhaust pipe, the second exhaust pipe, and the metal support structure are configured to have a sufficient thickness to pass the rated current of the gas circuit breaker,
The container has a main barrel portion that houses the arc-extinguishing chamber in a substantially coaxial direction and a flat plate portion that closes one end thereof,
The fixed-side conductor lead-out portion is disposed on the flat plate portion of the container,
4. The gas circuit breaker according to claim 1, wherein the fixed-side connection body is attached to an outer surface of the bottom plate portion of the second exhaust pipe. 5. An insulating support structure for insulatingly supporting the second exhaust pipe with respect to the container;
The gas circuit breaker according to any one of claims 1 to 3, wherein the first exhaust pipe and the second exhaust pipe are electrically separated from each other. The container includes the arc extinguishing chamber for each phase for three phases and the exhaust structure for each phase for three phases, and the fixed-side connection for each phase for three phases from the conductor lead-out portion on the fixed side. A three-phase gas circuit breaker from which conductors are taken out,
2. The gas circuit breaker according to claim 1, wherein the exhaust structure portion of each phase includes the first exhaust pipe and the second exhaust pipe. In the second exhaust cylinder constituting the exhaust structure portion of each phase, the cross-sectional shape of the inner surface of the main body portion of the second exhaust cylinder on the axial orthogonal cross section orthogonal to the axial direction of the second exhaust cylinder is substantially elliptical. The second exhaust cylinder is configured such that the substantially elliptical minor axis direction substantially coincides with the linear direction connecting the central axis of the arc extinguishing chamber of the phase and the central axis of the container on the cross section orthogonal to the axis. The gas circuit breaker according to claim 7, wherein the gas circuit breaker is disposed in The exhaust structure portion of each phase includes a metal support structure that supports the second exhaust pipe at the same potential with respect to the first exhaust pipe,
The first exhaust pipe, the second exhaust pipe, and the metal support structure constituting the exhaust structure portion of each phase have a sufficient thickness to pass the rated current of the gas circuit breaker. Configured,
The container has a main body portion that houses the arc extinguishing chamber of each phase in a substantially coaxial direction,
The fixed-side conductor lead-out portion is disposed on a side surface of the main trunk portion of the container,
The second exhaust pipe constituting the exhaust structure portion of each phase has the main body portion overlapped with the fixed-side conductor lead-out portion, and the opening end portion of the main-body portion does not overlap with the conductor lead-out portion. Arranged,
The fixed-side connection conductor of each phase is attached to the outer surface of the substantially cylindrical main body portion of the second exhaust pipe constituting the exhaust structure part of each phase. 8. The gas circuit breaker according to 8. The exhaust structure portion of each phase includes a metal support structure that supports the second exhaust pipe at the same potential with respect to the first exhaust pipe,
The first exhaust pipe, the second exhaust pipe, and the metal support structure constituting the exhaust structure portion of each phase have a sufficient thickness to pass the rated current of the gas circuit breaker. Configured,
The container has a main body portion that houses the arc extinguishing chamber of each phase in a substantially coaxial direction and a flat plate portion that closes one end thereof,
The fixed-side conductor lead-out portion is disposed on the flat plate portion of the container,
The fixed-side connection conductor of each phase is attached to the outer surface of the bottom plate portion of the second exhaust pipe constituting the exhaust structure portion of each phase. Gas circuit breaker. The exhaust structure portion of each phase includes an insulating support structure for insulatingly supporting the second exhaust pipe with respect to the container,
The gas circuit breaker according to claim 7 or 8, wherein the first exhaust cylinder and the second exhaust cylinder constituting the exhaust structure portion of each phase are electrically separated.

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