Switchgear

Abstract

To provide a switchgear of a two-phase batch operation system and a switchgear of a single-phase operation system that can ensure reliability equivalent to that of a switchgear of a three-phase batch operation system, and can achieve cost reduction and quick market introduction.SOLUTION: A switchgear reciprocatingly driving a movable contact and transitioned alternately to a cut-off state and an introduction state, and has a contact housing tank that is disposed therein a stationary contact and a movable contact; a dummy weight housing tank that is disposed therein a dummy weight; a contact shield rod; a dummy weight shield rod; a link that is rotatably coupled to the contact shield rod and the dummy weight shield rod; a rotatable coupling lever that is rotatably coupled to the other end of the link; a coupling rod that is rotatably coupled to the other end of the coupling lever, and is arranged movably in a direction orthogonal to the contact shield rod and the dummy weight shield rod; an output rod that is rotatably coupled to the other end of the coupling rod; and an operation mechanism that reciprocatingly drives the output rod.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a switching device. [Background technology]

[0002] Switchgear (circuit breaker) is a type of power transmission and transformation equipment that controls the switching of large amounts of power to protect the power system from lightning damage and ensure stable operation of the power system. Switchgear requires high-response and high-speed operation of moving contacts to minimize the effects of arc discharge when opening (breaking) and closing (closing). The operating mechanisms that drive the moving contacts are widely used, including spring operating mechanisms that use spring operating force and hydraulic operating mechanisms that use hydraulic pressure.

[0003] The switchgear installed in substations generally use either a three-phase collective operation system in which the movable contacts for three phases are driven by a single operating mechanism, or a single-phase operation system in which the movable contacts for one phase are driven by a single operating mechanism. Conventional examples of three-phase collective operation circuit breakers include the technologies described in Patent Document 1 and Patent Document 2, for example.

[0004] In the switchgear of Patent Document 1, the movable contacts of each phase are connected to insulating rods, the other ends of the insulating rods of each phase are rotatably connected to one end of a rotatable connecting lever, and the other ends of the connecting levers of each phase are connected to connecting rods, which are inserted and arranged to be movable in a direction perpendicular to the insulating rods of each phase, and one end of the connecting rods is connected to the output rod of the operating mechanism. In a switchgear configured in this way, the reciprocating motion of the output rod of the operating mechanism also moves the connecting rod, rotating the connecting levers of each phase. Then, the movable contacts of each phase reciprocate via the insulating rods of each phase, allowing for opening and closing operations.

[0005] In the switchgear of Patent Document 2, the movable contacts of each phase are connected to insulating rods, the other ends of the insulating rods of each phase are rotatably connected to one end of a connecting lever for each phase fixed to a connecting shaft, and an operating mechanism for rotating the connecting shaft is disposed at one end of the connecting shaft. In a switchgear configured in this manner, the connecting levers of each phase are rotated by rotating the connecting shaft with the operating mechanism. Then, the movable contacts of each phase reciprocate via the insulating rods of each phase, thereby performing opening and closing operations.

[0006] The conventional three-phase collective operation type switchgear will be described again with reference to Figures 12 and 13. Figure 12 is a diagram showing the interrupted state of a conventional three-phase collective operation type switchgear 100, and Figure 13 is a diagram showing the closed state.

[0007] 12 and 13, a conventional three-phase collective operation type switchgear 100 includes tanks 10a-10c filled with a highly insulating gas, and fixed contacts 11a-11c and movable contacts 12a-12c are arranged opposite each other inside the tanks. Insulating rods 13a-13c are connected to the other ends of the movable contacts 12a-12c opposite the fixed contacts 11a-11c, and translationally slidable seal rods 14a-14c are connected to the other ends of the insulating rods 13a-13c.

[0008] Links 7a-7c, which are rotatably connected to the other ends of seal rods 14a-14c, are rotatably connected to one ends of rotatable connecting levers 6a-6c. A first connecting rod 5a is rotatably connected to the other ends of connecting levers 6a-6c and is disposed so as to be movable in a direction perpendicular to the seal rods 14a-14c. Furthermore, the other end of first connecting rod 5a is rotatably connected to output rod 4 of operating mechanism 3.

[0009] In the opening and closing device 100 configured as described above, when a cut-off command is input to the operating mechanism 3, the operating mechanism 3 moves the output rod 4 in the direction of arrow A in Figure 12 (towards the left in the figure), causing the connecting levers 6a to 6c to rotate in the direction of arrow B (clockwise in the figure) and the movable contacts 12a to 12c to move in the direction of arrow C (towards the bottom in the figure), thereby separating from the fixed contacts 11a to 11c and entering a cut-off state.

[0010] In addition, when a closing command is input to the operating mechanism 3, the operating mechanism 3 moves the output rod 4 in the direction of arrow D in Figure 13 (towards the right in the figure), causing the connecting levers 6a to 6c to rotate in the direction of arrow E (counterclockwise in the figure) and the movable contacts 12a to 12c to move in the direction of arrow F (upward in the figure), thereby coming into contact with the fixed contacts 11a to 11c and entering the closing state. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Utility Model Application Publication No. 63-93705 [Patent Document 2] Japanese Patent Application Publication No. 1-220321 Summary of the Invention [Problem to be solved by the invention]

[0012] On the other hand, in AC electric railway substations, three-phase power is received and converted into two sets of single-phase power using a three-phase to two-phase conversion transformer, so a switchgear with a two-phase collective operation method, in which moving contacts for two phases are driven by a single operating mechanism, or a single-phase operation method is required.

[0013] When a three-phase collective operation switchgear is applied to two sets of single-phase power, the contacts of the phases that do not carry current are wasted, leaving the possibility of cost reduction. Furthermore, when developing a new two-phase collective operation or single-phase operation switchgear, new development elements are required, such as the operating mechanism, connecting mechanism parts such as connecting rods, tanks, and the structure that holds the tanks, delaying the time to market. Furthermore, it is not guaranteed that the same reliability as a three-phase collective operation switchgear, which has a proven track record and high reliability, will be ensured.

[0014] As described above, when developing two-phase collective operation type or single-phase operation type switchgear, it is necessary to ensure reliability equivalent to that of the well-proven three-phase collective operation type switchgear, reduce costs, and quickly bring the switchgear to market.

[0015] The present invention has been made in response to the above-mentioned conventional circumstances, and its object is to provide a two-phase collective operation type switching device and a single-phase operation type switching device that can ensure reliability equivalent to that of the well-proven three-phase collective operation type switching device, reduce costs, and enable rapid market introduction. [Means for solving the problem]

[0016] In order to achieve the above object, a switching device according to an embodiment is a switching device that reciprocates a movable contact to alternate between a break state and a make state, and includes a contact accommodating tank filled with insulating gas and having a fixed contact and the movable contact disposed therein, a dummy weight accommodating tank filled with insulating gas and having a dummy weight disposed therein, a contact shield rod connected to the movable contact via an insulating rod and having one end led out of the contact accommodating tank so as to be slidable in translation, and a dummy weight connected to the dummy weight and having one end led out of the dummy weight accommodating tank so as to be slidable in translation. a weight shield rod, links rotatably connected at one end to the contact shield rod and the dummy weight shield rod, respectively; rotatable connecting levers rotatably connected at one end to the other end of each of the links; a connecting rod rotatably connected to the other end of the connecting lever and arranged to be movable in a direction perpendicular to the contact shield rod and the dummy weight shield rod; an output rod rotatably connected at one end to an end of the connecting rod; and an operating mechanism connected to the other end of the output rod for reciprocating the output rod. [Effects of the Invention]

[0017] According to an embodiment of the present invention, it is possible to apply a three-phase collective operation type switchgear to two-phase collective operation type and single-phase operation type circuit breakers with fewer replacement parts, thereby ensuring high reliability equivalent to that of the well-proven three-phase collective operation type switchgear, reducing costs, and enabling rapid market introduction. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a diagram showing a disconnected state of the two-phase collective operation type switchgear according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing the closed state of the two-phase collective operation type switchgear according to the first embodiment. [Figure 3] FIG. 10 is a diagram showing a disconnected state of a single-phase operation type switchgear according to a second embodiment. [Figure 4] FIG. 10 is a diagram showing a closed state of a single-phase operation type switchgear according to a second embodiment. [Figure 5] FIG. 11 is a diagram showing a disconnected state of a single-phase operation type switchgear according to a third embodiment. [Figure 6] FIG. 4 is a diagram showing the time history displacement of the movable contact during the closing operation. [Figure 7] FIG. 11 is a diagram showing the time history displacement of the movable contact in the closing operation in the third embodiment. [Figure 8] FIG. 10 is a diagram showing the configuration of a main part of a single-phase operation type switching device according to a fourth embodiment. [Figure 9] FIG. 10 is a diagram showing another example of the configuration of the main parts of the single-phase operation type switching device according to the fourth embodiment. [Figure 10] 10A and 10B are diagrams showing the main configuration of a single-phase operation type switchgear according to a fifth embodiment, in which (a) shows the cut-off state and (b) shows the close state. [Figure 11] 10A and 10B are diagrams showing the main configuration of a single-phase operation type switchgear according to a sixth embodiment, in which (a) shows the cut-off state and (b) shows the close state. [Figure 12] FIG. 10 is a diagram showing the interruption state of a conventional three-phase collective operation type switchgear. [Figure 13] FIG. 1 is a diagram showing the closed state of a conventional three-phase collective operation type switchgear. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an opening and closing device according to an embodiment will be described with reference to the drawings.

[0020] [First embodiment] (two-phase collective operation type circuit breaker) FIG. 1 is a diagram showing a two-phase collective operation type switchgear 1 according to the first embodiment in an interrupted state, and FIG. 2 is a diagram showing a closed state. As shown in FIGS. 1 and 2, the two-phase collective operation type switchgear 1 according to the first embodiment has three tanks: a first tank 10a, a second tank 10b, and a fourth tank 10d. Of these tanks, the first tank 10a and the second tank 10b are contact housing tanks in which contacts are disposed, and the fourth tank 10d is a dummy weight housing tank in which a dummy weight is disposed. The fourth tank 10d is called the fourth tank 10d because it is provided in place of the third tank 10c of a conventional three-phase collective operation type switchgear.

[0021] 1 and 2, in a two-phase collective operation type switchgear 1 according to the first embodiment, a first fixed contact 11a and a first movable contact 12a are arranged facing each other inside a first tank 10a filled with a highly insulating gas. A first insulating rod 13a is connected to the other end of the first movable contact 12a opposite the first fixed contact 11a, and a first seal rod 14a that is slidable in translation is connected to the other end of the first insulating rod 13a. A first link 7a that is rotatably connected to the other end of the first seal rod (contact shield rod) 14a is rotatably connected to one end of a rotatable first connecting lever 6a.

[0022] Similarly, second fixed contact 11b and second movable contact 12b are arranged facing each other inside second tank 10b, which is filled with a highly insulating gas. Second insulating rod 13b is connected to the other end of second movable contact 12b, opposite second fixed contact 11b, and a second seal rod (contact shield rod) 14b, which is slidable in translation, is connected to the other end of second insulating rod 13b. A second link 7b, which is rotatably connected to the other end of second seal rod 14b, is rotatably connected to one end of a rotatable second connecting lever 6b.

[0023] A third seal rod (dummy weight shield rod) 14c, which is slidable in translation, is connected to one end of a first dummy weight 20a disposed inside a fourth tank 10d filled with a highly insulating gas. The mass of this first dummy weight 20a is equal to or greater than the sum of the masses of the first movable contact 12a and the first insulating rod 13a (which is equal to the masses of the second movable contact 12b and the second insulating rod 13b). In other words, the mass of the first dummy weight 20a is equal to or greater than the sum of the masses of the third movable contact 12c and the third insulating rod 13c provided in the third tank 10c of a conventional three-phase collective operation type switchgear, which is omitted in this first embodiment. A third link 7c, rotatably connected to the other end of the third seal rod 14c, is rotatably connected to one end of a rotatable third connecting lever 6c.

[0024] The first connecting rod 5a is rotatably connected to the other ends of the first to third connecting levers 6a to 6c and is arranged to be freely movable in a direction perpendicular to the first to third seal rods 14a to 14c, and further, the other end of the first connecting rod 5a is rotatably connected to the output rod 4 of the operating mechanism 3.

[0025] In the two-phase collective operation type switchgear 1 of the first embodiment configured as described above, when a break command is input to the operation mechanism 3, the operation mechanism 3 moves the output rod 4 in the direction of arrow A in Fig. 1 (towards the left in the figure), causing the first to third connecting levers 6a to 6c to rotate in the direction of arrow B (clockwise in the figure) and the first and second movable contacts 12a and 12b to move in the direction of arrow C (towards the bottom in the figure), so that they are separated from the first and second fixed contacts 11a and 11b and enter a break state. At the same time, the first dummy weight 20a moves in the direction of arrow C.

[0026] Furthermore, when a closing command is input to the operating mechanism 3, the operating mechanism 3 moves the output rod 4 in the direction of arrow D in Fig. 2 (to the right in the figure), causing the first to third connecting levers 6a to 6c to rotate in the direction of arrow E (counterclockwise in the figure) and the first and second movable contacts 12a and 12b to move in the direction of arrow F (upward in the figure), thereby coming into contact with the first and second fixed contacts 11a and 11b and entering the closed state. At the same time, the first dummy weight 20a moves in the direction of arrow F.

[0027] According to the first embodiment, by making the mass of the first dummy weight 20a equal to the sum of the masses of the movable contact 12a and the insulating rod 13a (or the movable contact 12b and the insulating rod 13b), the total equivalent mass of the movable parts converted into the operating mechanism 3 side becomes equal to that in the case of a conventional three-phase collective operation method. As a result, the operating characteristics of the breaking operation and the closing operation become almost equal to those of a conventional three-phase collective operation type switchgear.

[0028] Furthermore, the components of the first embodiment, including the tank support structure (not shown), can be almost identical to those of a conventional three-phase collective operation type circuit breaker, which allows for cost reduction through the use of common parts. Furthermore, since there are few parts that need to be newly developed, the time to market can be expedited. Furthermore, reliability equivalent to that of a well-proven three-phase collective operation type circuit breaker can be ensured.

[0029] Furthermore, taking into consideration the sliding friction between the third fixed contact 11c and the third movable contact 12c (see Figures 12 and 13) in a conventional three-phase collective operation type switching device, the mass of the first dummy weight 20a can be increased to be greater than the total mass of the movable contact 12a and the insulating rod 13a, thereby making it possible to bring the operating characteristics closer to those of a conventional three-phase collective operation type switching device.

[0030] Furthermore, since there are no contact points inside the fourth tank 10d, the dimensions in the tank axial direction can be made smaller than those of the first and second tanks 10a and 10b, thereby achieving further cost reductions.

[0031] [Second embodiment] (single-phase operation type switching device) FIG. 3 is a diagram showing a break state of a single-phase operation type switchgear 2 according to the second embodiment, and FIG. 4 is a diagram showing a make state. As shown in FIGS. 3 and 4, the single-phase operation type switchgear 2 according to the second embodiment has two tanks, a first tank 10a and a fourth tank 10d. Of these tanks, the first tank 10a is a contact housing tank in which contacts are disposed, and the fourth tank 10d is a dummy weight housing tank in which a dummy weight is disposed. Note that the second embodiment is configured such that the second tank 10b is removed and the fourth tank 10d is provided in place of the third tank 10c in a conventional three-phase collective operation type switchgear.

[0032] As shown in Figures 3 and 4, a first fixed contact 11a and a first movable contact 12a are arranged opposite each other inside a first tank 10a filled with a highly insulating gas. A first insulating rod 13a is connected to the other end of the first movable contact 12a opposite the first fixed contact 11a, and a first seal rod 14a that is slidable in translation is connected to the other end of the first insulating rod 13a. A first link 7a is rotatably connected to the other end of the first seal rod 14a, and is rotatably connected to one end of a first connecting lever 6a that is rotatable.

[0033] A third seal rod 14c that is slidable in translation is connected to one end of a second dummy weight 20b that is disposed inside a fourth tank 10d that is filled with a highly insulating gas. A third link 7c that is rotatably connected to the other end of the third seal rod 14c is rotatably connected to one end of a third connecting lever 6c.

[0034] The second connecting rod 5b is rotatably connected to the other ends of the first and third connecting levers 6a and 6c, and is arranged to be movable in a direction perpendicular to the first and third seal rods 14a and 14c.Furthermore, the other end of the second connecting rod 5b is rotatably connected to the output rod 4 of the operating mechanism 3.

[0035] The mass of the second dummy weight 20b is equal to or greater than twice the total mass of the first movable contact 12a and the first insulating rod 13a. In other words, the mass is equal to or greater than the total mass of the second movable contact 12b and the second insulating rod 13b provided in the second tank 10b and the third movable contact 12c and the third insulating rod 13c provided in the third tank 10c of a conventional three-phase collective operation type switchgear, which is omitted in this second embodiment.

[0036] In the single-phase operation type switching device 2 of the second embodiment configured as described above, when a break command is input to the operation mechanism 3, the operation mechanism 3 moves the output rod 4 in the direction of arrow A in Fig. 3 (towards the left in the figure), causing the first and third connecting levers 6a and 6c to rotate in the direction of arrow B (clockwise in the figure) and the first movable contact 12a to move in the direction of arrow C (downward in the figure), thereby separating from the first fixed contact 11a and entering a break state. At the same time, the second dummy weight 20b moves in the direction of arrow C.

[0037] 4 (toward the right in the figure), the first and third connecting levers 6a and 6c rotate in the direction of arrow E (counterclockwise in the figure), and the first movable contact 12a moves in the direction of arrow F (upward in the figure), making contact with the first fixed contact 11a and entering the closed state. At the same time, the second dummy weight 20b moves in the direction of arrow F.

[0038] According to the second embodiment, the mass of the second dummy weight 20b is set to be equal to twice the total mass of the first movable contact 12a and the first insulating rod 13a, so that the total equivalent mass of the movable parts converted into the operating mechanism 3 side is equal to that of a conventional three-phase collective operation type switchgear. As a result, the operating characteristics of the breaking operation and the closing operation are almost equal to those of a conventional three-phase collective operation type switchgear.

[0039] Furthermore, the components of the second embodiment, including the tank support structure (not shown), can be almost identical to those of a conventional three-phase collective operation type switchgear, which allows for cost reduction through the use of common parts. Furthermore, since few parts need to be newly developed, the time to market can be expedited. Furthermore, reliability equivalent to that of the well-proven three-phase collective operation type switchgear can be ensured.

[0040] In addition, by taking into consideration the sliding friction between the second fixed contact 11b and the second movable contact 12b, and the sliding friction between the third fixed contact 11c and the third movable contact 12c, the mass of the second dummy weight 20b is increased to more than twice the total mass of the first movable contact 12a and the first insulating rod 13a, thereby making the operating characteristics closer to those of a conventional three-phase collective operation type switching device.

[0041] Furthermore, since there are no contact points inside the fourth tank 10d, the dimensions in the tank axial direction can be made smaller than the first tank 10a, which also allows for further cost reduction.

[0042] [Third embodiment] (single-phase operation type circuit breaker) Fig. 5 is a diagram showing the interruption state of a single-phase operation type switching device 2 according to the third embodiment. In Fig. 5, parts that are the same as or similar to those of the first and second embodiments shown in Figs. 1 to 4 are given the same reference numerals and redundant explanations will be omitted.

[0043] In the third embodiment, a first cylinder 21a is installed inside the fourth tank 10d, and a piston-shaped third dummy weight 20c is slidably disposed inside the first cylinder 21a. A third seal rod 14c is connected to one end of the third dummy weight 20c. An operating space 22 surrounded by the first cylinder 21a and the third dummy weight 20c is located on the third seal rod 14c side. Furthermore, the orifice 23 is provided at the bottom of the first cylinder 21a or the like so that it is always located in the operating space 22 regardless of the position of the third dummy weight 20c. The mass of the third dummy weight 20c is, for example, equivalent to the sum of the masses of the first movable contact 12a and the first insulating rod 13a and is smaller than the mass of the second dummy weight 20b in the second embodiment.

[0044] In the single-phase operation type switchgear of the third embodiment configured as described above, during the breaking operation, the third dummy weight 20c moves in the direction of arrow C, so that the working space 22 is compressed and the pressure in the working space 22 becomes higher than the pressure inside the fourth tank 10d. Therefore, the third dummy weight 20c receives a reaction force in the direction opposite to the direction of arrow C.

[0045] Furthermore, during the closing operation, the third dummy weight 20c moves in the direction of arrow F, expanding the working space 22 and making the pressure in the working space 22 lower than the pressure inside the fourth tank 10d. Therefore, the third dummy weight 20c receives a reaction force in the direction opposite to the direction of arrow F.

[0046] Since the third dummy weight 20c is lighter than the second dummy weight 20b, the time history displacement 31 of the movable contact when the first cylinder 21a is not provided as shown in Fig. 6 has a steeper slope than the time history displacement 32 of the movable contact of the conventional three-phase simultaneous operation gas circuit breaker. However, by providing the first cylinder 21a, it is possible to realize a time history displacement equivalent to the time history displacement 32 of the movable contact of the conventional three-phase simultaneous operation gas circuit breaker, as shown in time history displacement 33 as shown in Fig. 7.

[0047] Furthermore, since the third dummy weight 20c is lighter than the second dummy weight 20b, the possibility of damage to the third seal rod 14c due to inertial force or the like is reduced, and reliability can be improved.

[0048] [Fourth embodiment] (single-phase operation type circuit breaker) Fig. 8 is a diagram showing the main internal configuration of the fourth tank 10d of the single-phase operation type switchgear according to the fourth embodiment, showing the interrupted state. In Fig. 8, parts that are the same as or similar to those of the first and third embodiments shown in Figs. 1 to 5 are given the same reference numerals, and duplicated explanations will be omitted.

[0049] As shown in FIG. 8, in the fourth embodiment, a check valve 24 is disposed in a first cylinder 21a installed inside the fourth tank 10d so as to close when the pressure in the working space 22 is lower than the pressure inside the fourth tank 10d, and open when the pressure is higher.

[0050] In the single-phase operation type opening and closing device of the fourth embodiment configured as described above, the check valve 24 closes during the closing operation, so the pressure in the working space 22 drops to the same level as in the third embodiment, and the third dummy weight 20c can receive the same reaction force as in the third embodiment. On the other hand, during the closing operation, the check valve 24 opens, so the pressure in the working space 22 does not rise to the same level as in the third embodiment, and the third dummy weight 20c receives a reaction force that is lower than in the third embodiment.

[0051] Since the pressure change is proportional to the change in volume of the operating space 22, in the case of a general switchgear, the speed of the movable contact is faster in the breaking operation than in the closing operation, so the pressure rise in the operating space 22 during the breaking operation is large and the reaction force of the third dummy weight 20c may become excessive. Therefore, in the fourth embodiment, by providing the check valve 24, the operating characteristics during the breaking operation can be made equivalent to those of a three-phase simultaneous operation type circuit breaker.

[0052] Furthermore, as shown in FIG. 9, a check valve 24 may be provided on the third dummy weight 20c so as to open in the shutoff operation and close in the on state, thereby achieving the same effect.

[0053] [Fifth embodiment] (single-phase operation type circuit breaker) Fig. 10 is a diagram showing the internal configuration of the main parts of the fourth tank 10d of the single-phase operation type opening and closing device according to the fifth embodiment. Note that parts that are the same as or similar to those of the first to fourth embodiments shown in Figs. 1 to 5, 8 and 9 are given the same reference numerals and redundant explanations will be omitted.

[0054] In this fifth embodiment, a first cylinder 21a installed inside the fourth tank 10d is provided with a plurality of orifices 23 (three in the example shown in Figure 10), and the number of orifices 23 arranged in the operating space 22 in the on state is greater than that in the off state.

[0055] In the single-phase operation type circuit breaker of the fifth embodiment configured as described above, during the closing operation, which transitions from the state shown in Fig. 10(a) to the state shown in Fig. 10(b), the number of orifices 23 in the working space 22 increases, and therefore the flow path cross-sectional area increases. This makes it possible to adjust the pressure drop in the working space 22, thereby making it possible to bring the operating characteristics closer to those of a three-phase simultaneous operation type circuit breaker. In particular, in the latter half of the closing operation, sliding friction occurs between the moving contact and the fixed contact, and this frictional force may cause the circuit breaker to stop midway through the closing operation. However, if the pressure drop in the working space 22 is small, the reaction force on the third dummy weight 20c is also small, and it is possible to avoid the circuit breaker from stopping during the closing operation.

[0056] [Sixth embodiment] (single-phase operation type circuit breaker) Fig. 11 is a diagram showing the internal configuration of the main parts of the fourth tank 10d of the single-phase operation type switchgear according to the sixth embodiment. Note that parts that are the same as or similar to those of the first to fifth embodiments shown in Figs. 1 to 5 and 8 to 10 are given the same reference numerals, and duplicated explanations will be omitted.

[0057] In the sixth embodiment, the first cylinder 21a installed inside the fourth tank 10d has a shape in which the internal cross-sectional area expands in accordance with the direction of the closing operation of the third dummy weight 20c.

[0058] In the single-phase operation type switchgear of the sixth embodiment configured as described above, the cross-sectional area of ​​the flow path from the working space 22 to the inside of the fourth tank 10d increases during the closing operation. This makes it possible to adjust the pressure drop in the working space 22, thereby making it possible to bring the operating characteristics closer to those of a three-phase simultaneous operation type switchgear. In particular, in the latter half of the closing operation, sliding friction occurs between the moving contact and the fixed contact, and this frictional force may cause the closing operation to stop midway. However, if the pressure drop in the working space 22 is small, the reaction force on the third dummy weight 20c is also small, making it possible to avoid the switchgear from stopping during the closing operation.

[0059] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as the inventions described in the claims and their equivalents. [Explanation of symbols]

[0060] 1...Two-phase collective operation type switchgear, 2...Single-phase operation type switchgear, 3...Operation mechanism, 4...Output rod, 5a...First connecting rod, 5b...Second connecting rod, 6a, 6b, 6c...Connecting levers, 7a, 7b, 7c...Link, 10a...First tank, 10b...Second tank, 10c...Third tank, 10d...Fourth tank, 11a...First fixed contact, 11b...Second fixed contact, 11c...Third fixed contact, 12a...First moving contact, 12b...Second moving contact, 12c ......Third movable contact, 13a......First insulating rod, 13b......Second insulating rod, 13c......Third insulating rod, 14a......First seal rod, 14b......Second seal rod, 14c......Third seal rod, 20a......First dummy weight, 20b......Second dummy weight, 20c......Third dummy weight, 21a......First cylinder, 21b......Second cylinder, 22......Working space, 23......Orifice, 24......Check valve, 100......Conventional three-phase collective operation type circuit breaker.

Claims

1. A switching device that reciprocates a movable contact to transition between an open state and an open state, a contact accommodating tank filled with insulating gas and having the fixed contact and the movable contact disposed therein; a dummy weight storage tank in which an insulating gas is sealed and in which a dummy weight is disposed; a contact shield rod connected to the movable contact via an insulating rod and having one end extending outside the contact accommodating tank, the contact shield rod being capable of translating and sliding; a dummy weight shield rod connected to the dummy weight and having one end led out of the dummy weight storage tank so as to be freely slidable in translation; a link rotatably connected at one end to the contact shield rod and the dummy weight shield rod; a rotatable connecting lever, one end of which is rotatably connected to the other end of each of the links; a connecting rod rotatably connected to the other end of the connecting lever and arranged to be movable in a direction perpendicular to the contact shield rod and the dummy weight shield rod; an output rod rotatably connected at one end to the end of the connecting rod; an operating mechanism connected to the other end of the output rod and configured to reciprocate the output rod; An opening and closing device comprising:

2. A single-phase operation type switching device having one contact accommodating tank.

2. The opening and closing device according to claim 1.

3. The mass of the dummy weight is equal to or greater than twice the total mass of the movable contact and the insulating rod.

3. The opening and closing device according to claim 2.

4. A cylinder having an orifice and the piston-shaped dummy weight slidably disposed inside the cylinder are disposed inside the dummy weight storage tank, the orifice is provided in the cylinder so as to be always disposed in an operating space surrounded by the cylinder and the piston-shaped dummy weight regardless of a position of the piston-shaped dummy weight, The mass of the piston-shaped dummy weight is equal to the sum of the masses of the movable contact and the insulating rod.

3. The opening and closing device according to claim 2.

5. A two-phase collective operation type switching device having two of the contact accommodating tanks.

2. The opening and closing device according to claim 1.

6. The mass of the dummy weight is equal to or greater than the total mass of the movable contact and the insulating rod.

6. The opening and closing device according to claim 5.

7. A two-phase collective operation type switching device that simultaneously reciprocates two-phase movable contacts to transition between an open state and an open state, first, second, and fourth tanks each containing an insulating gas; first and second fixed contacts disposed within the first and second tanks; first and second movable contacts arranged opposite the first and second fixed contacts; first and second insulating rods, one end of each of which is connected to the other end of each of the first and second movable contacts, opposite to the first and second fixed contacts; first and second seal rods, one end of which is connected to the other end of the first and second insulating rods, and which are slidable in translation; first and second links each having one end rotatably connected to the other end of the first and second seal rods; first and second rotatable connecting levers, one end of which is rotatably connected to the other end of the first and second links; a first dummy weight disposed inside the fourth tank; a third seal rod having one end connected to an end of the first dummy weight and capable of slidably moving in translation; a third link rotatably connected at one end to the other end of the third seal rod; a third connecting lever rotatably connected at one end to the other end of the third link; a first connecting rod rotatably connected to the other ends of the first to third connecting levers and arranged to be movable in a direction perpendicular to the first to third seal rods; an output rod rotatably connected at one end to the end of the first connecting rod; an operating mechanism connected to the other end of the output rod and configured to reciprocate the output rod; An opening and closing device comprising:

8. a mass of the first dummy weight is equal to or greater than a total mass of the first movable contact and the first insulating rod; The opening and closing device according to claim 7 .

9. A single-phase operation type switching device that reciprocates a single-phase movable contact to transition between an open state and an open state, first and fourth tanks in which highly insulating gases are sealed; a first fixed contact disposed within the first tank; a first movable contact arranged opposite the first fixed contact; a first insulating rod having one end connected to the other end of the first movable contact opposite to the first fixed contact; a first seal rod having one end connected to the other end of the first insulating rod and capable of slidably moving in translation; a first link having one end rotatably connected to the other end of the first seal rod; a first connecting lever rotatably connected at one end to the other end of the first link; a second dummy weight disposed inside the fourth tank; a third seal rod having one end connected to an end of the second dummy weight and capable of translating and sliding; a third link rotatably connected at one end to the other end of the third seal rod; a third connecting lever rotatably connected at one end to the other end of the third link; a second connecting rod rotatably connected to the other ends of the first and third connecting levers and arranged to be movable in a direction perpendicular to the first and third seal rods; an output rod rotatably connected at one end to the end of the second connecting rod; an operating mechanism connected to the other end of the output rod and configured to reciprocate the output rod; An opening and closing device comprising:

10. The mass of the second dummy weight is equal to or greater than twice the total mass of the first movable contact and the first insulating rod. The opening and closing device according to claim 9 .

11. A single-phase operation type switching device that reciprocates a single-phase movable contact to transition between an open state and an open state, first and fourth tanks in which highly insulating gases are sealed; a first fixed contact disposed within the first tank; a first movable contact arranged opposite the first fixed contact; a first insulating rod having one end connected to the other end of the first movable contact opposite to the first fixed contact; a first seal rod having one end connected to the other end of the first insulating rod and capable of slidably moving in translation; a first link having one end rotatably connected to the other end of the first seal rod; a first connecting lever rotatably connected at one end to the other end of the first link; a first cylinder installed inside the fourth tank; an orifice provided in the first cylinder; a third dummy weight having a piston shape and slidably disposed inside the first cylinder; a third seal rod having one end connected to an end of the third dummy weight and capable of translating and sliding; a third link rotatably connected at one end to the other end of the third seal rod; a third connecting lever rotatably connected at one end to the other end of the third link; a second connecting rod rotatably connected to the other ends of the first and third connecting levers and arranged to be movable in a direction perpendicular to the first and third seal rods; an output rod rotatably connected at one end to the end of the second connecting rod; an operating mechanism connected to the other end of the output rod and driving the output rod to reciprocate; the orifice is provided in the first cylinder so as to be always disposed in an operating space surrounded by the first cylinder and the third dummy weight regardless of a position of the third dummy weight, a mass of the third dummy weight is equal to a sum of a mass of the first movable contact and a mass of the first insulating rod; A single-phase operation type switching device characterized by the above.

12. a check valve is provided in the first cylinder, the check valve being opened during a shutoff operation and closed during a closing operation; The opening and closing device according to claim 11 .

13. a check valve is provided on the third dummy weight, and the check valve opens during a shutoff operation and closes during a closing operation; The opening and closing device according to claim 11 .

14. The first cylinder is provided with a plurality of orifices such that the number of the orifices arranged in the working space in the closed state is greater than that in the closed state. The opening and closing device according to any one of claims 11 to 13.

15. Instead of the first cylinder, a second cylinder having a shape whose internal cross-sectional area increases in accordance with the insertion operation direction of the third dummy weight is provided. The opening and closing device according to any one of claims 11 to 13.

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