Gas-insulated switchgear

Abstract

To provide a gas insulated switchgear which can suppress deterioration of insulation performance of an insulation spacer.SOLUTION: A switching part 12 switches energization by moving a contact 38 provided at one of a first contact piece 30 and a second contact piece 31 in a horizontal direction of a housing to contact or not to contact the other of the first contact piece 30 and the second contact piece 31. A sectioning part 20 sections a second container 19 which accommodates the switching part 12 and a first container 18 loaded with the second container 19. An insulation spacer 29 is attached to the sectioning part 20 to insulate a conductor 48 of the first contact piece 30 arranged in the sectioning part 20 from the sectioning part 20. The sectioning part 20 has a foreign matter accommodation part 54 which accommodates a foreign matter existing inside the second container 19 at a lower part of at least a part of an area in which the contact 38 moves between the first contact piece 30 and the second contact piece 31.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a gas-insulated switchgear.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, a gas-insulated switchgear in which a power receiving unit and a transformer unit are integrated is well known. This gas-insulated switchgear has, for example, a three-stage structure in which a power receiving unit container, a bus container, and a transformer unit container are arranged in order from the bottom. Conductors that electrically connect between the power receiving unit container and the bus container are insulated by insulating spacers that partition between these containers. Similarly, conductors that connect between the bus container and the transformer unit are also insulated by insulating spacers that partition between these containers.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a circuit breaker for opening and closing an electric circuit at no load is provided in the gas-insulated switchgear. Among circuit breakers, there is a sliding type in which a contact on the movable side contacts and slides with a contact on the fixed side to close the circuit. In the case of this sliding type, the metal on the surface may be peeled off due to the sliding of the contacts, and this may occur as metallic foreign matter in the container. If this metallic foreign matter falls on the insulating spacer, the insulating performance may not be satisfied.

Means for Solving the Problems

[0005] A gas-insulated switchgear for solving the above problems is a device in which an insulating gas is filled inside a housing and power is relayed through a path arranged in an atmosphere of the insulating gas, comprising: an opening / closing unit that opens and closes the supply of power by moving a contact provided on one of a first contactor and a second contactor in the horizontal direction of the housing to make contact with or not make contact with the other of the first contactor and the second contactor; a partition unit that separates a second container housing the opening / closing unit from a first container on which the second container is placed; and an insulating spacer attached to the partition unit to insulate the conductor of the first contactor located in the partition unit from the partition unit, wherein the partition unit has a foreign matter containment unit that contains foreign matter present inside the second container, located at least a portion below the area in which the contact moves between the first contactor and the second contactor.

[0006] With this configuration, if foreign matter generated during contact sliding falls, this foreign matter is contained in the foreign matter containment section, making it less likely for foreign matter to fall onto the insulating spacer. Therefore, it is less likely for foreign matter on the insulating spacer to electrically connect the switching section and the partition section. Thus, it is possible to suppress deterioration of the insulating performance of the insulating spacer. [Effects of the Invention]

[0007] This invention can suppress the deterioration of the insulating performance of insulating spacers. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of a gas-insulated switchgear according to one embodiment. [Figure 2] This is a schematic diagram showing the configuration of a gas-insulated switchgear. [Figure 3] This is a cross-sectional view showing the opening / closing mechanism in the open position. [Figure 4] This is a cross-sectional view showing the opening / closing mechanism in the closed state. [Figure 5] Figure 3 is a cross-sectional view along the VV line. [Figure 6] This is an enlarged cross-sectional view of the opening / closing mechanism in the closed position. [Figure 7] This is a cross-sectional view showing the configuration of a foreign object containment section in a different example. [Figure 8] This is a cross-sectional view showing the configuration of a foreign object containment section in another example. [Modes for carrying out the invention]

[0009] An embodiment of this disclosure is described below. (Gas-insulated switchgear 1) As shown in Figure 1, the gas-insulated switchgear 1 comprises an MOF (Metal Object Transformer) unit 2, a pair of power receiving transformer units 3, and an operation panel 4. The gas-insulated switchgear 1 has an insulating gas filling the inside of its housing 5. The insulating gas used is, for example, SF6 (sulfur hexafluoride). The gas-insulated switchgear 1 relays power through a path arranged in an atmosphere of insulating gas. The gas-insulated switchgear 1 is operated by an operator via the operation panel 4.

[0010] The power receiving transformer unit 3 is a unit that integrates power receiving and transforming functions. One of the pair of power receiving transformer units 3 is for regular use and the other is for backup use. The MOF unit 2 is located between the pair of power receiving transformer units 3. The MOF unit 2 measures the amount of power being relayed. The control panels 4 corresponding to each of the power receiving transformer units 3 are located in front of the gas-insulated switchgear 1.

[0011] (Power receiving transformer unit 3) As shown in Figure 2, the power receiving transformer unit 3 has a structure in which the power receiving mechanism 8 and the transformer mechanism 9 are stacked vertically, with the connection mechanism 7, which is connected to the MOF unit 2, positioned in the middle. In this example, the power receiving mechanism 8 is positioned on the lower side and the transformer mechanism 9 is positioned on the upper side. Thus, the power receiving transformer unit 3 in this example has a multi-stage structure (in this example, a three-stage structure) in which the power receiving mechanism 8, connection mechanism 7, and transformer mechanism 9 are stacked from bottom to top.

[0012] The power receiving mechanism 8 includes a current transformer CT, a cable head CHD, a surge arrester LA, a disconnector DS1, a grounding switch ES1, a circuit breaker GCB1, and a grounding switch ES2. The cable head CHD is provided at the end of the external cable 10 and connected to the disconnector DS1. The current transformer CT measures the current flowing through the external cable 10. The surge arrester LA protects the power receiving transformer unit 3 from abnormal voltages if an abnormal voltage is input to the power receiving transformer unit 3 from the cable head CHD. The disconnector DS1 opens and closes the power relay path in the power receiving mechanism 8. The grounding switch ES1 grounds the power relay path in the path of the disconnector DS1. The circuit breaker GCB1 switches the current on or off in the power receiving mechanism 8. The grounding switch ES2 grounds both ends of the circuit breaker GCB1 when it is closed during inspection of the circuit breaker GCB1.

[0013] The connection mechanism 7 includes a bus and a switching unit 12. In this example, the switching unit 12 includes a first switching unit 13 that opens and closes the input side of the bus and a second switching unit 14 that opens and closes the output side of the bus. The first switching unit 13 and the second switching unit 14 are, for example, disconnectors that open and close the power relay path in the connection mechanism 7.

[0014] The busbar consists of a return busbar connected to the MOF unit 2. The forward path of the busbar is connected at one end to the first switch 13 and at the other end to the MOF unit 2. The return path of the busbar is connected at one end to the second switch 14 and at the other end to the MOF unit 2. When the first switch 13 is closed, the power receiving mechanism 8 is connected to the MOF unit 2, and the power input by the power receiving mechanism 8 is transmitted to the MOF unit 2. When the second switch 14 is closed, the transformer mechanism 9 is connected to the MOF unit 2, and power from the MOF unit 2 is supplied to the transformer mechanism 9.

[0015] The transformer mechanism 9 includes a circuit breaker GCB2, an earthing switch ES3, and a transformer connection part 15. The circuit breaker GCB2 switches on or off the current in the transformer mechanism 9. The earthing switch ES3 grounds both ends of the circuit breaker GCB2 by closing during the inspection of the circuit breaker GCB2. The transformer connection part 15 is connected to a predetermined transformer (not shown).

[0016] (Container structure of the gas-insulated switchgear 1) As shown in FIG. 2, the gas-insulated switchgear 1 includes a first container 18 that forms the lower container of the housing 5 with a multi-stage structure, and a second container 19 placed on the first container 18. The first container 18 of this example houses, for example, the components of the power receiving mechanism 8. The first container 18 of this example houses, for example, a lightning arrester LA, a circuit breaker DS1, an earthing switch ES1, a circuit breaker GCB1, and an earthing switch ES2. It can also be said that the first container 18 is a circuit breaker container that houses the power receiving side circuit breaker GCB1. Both the first container 18 and the second container 19 are made of metal.

[0017] The second container 19 of this example houses, for example, the switching parts 12 on both sides of the outgoing path of the bus bar BUS. Thus, the second container 19 of this example houses the components of the connection mechanism 7. The second container 19 of this example houses a part of the bus bar BUS and the switching parts 12. It can also be said that the second container 19 is a bus bar container that houses the bus bar BUS.

[0018] The gas-insulated switchgear 1 includes a partition part 20 (hereinafter referred to as the first partition part 21) that partitions the second container 19 that houses the switching parts 12 and the first container 18 on which the second container 19 is placed. The first partition part 21 is, for example, an adapter flange. The first partition part 21 is formed in a plate shape when viewed from the side. The material of the first partition part 21 is, for example, metal. The first partition part 21 seals the accommodation chamber 22 of the first container 18 and the accommodation chamber 23 of the second container 19.

[0019] The gas-insulated switchgear 1 includes a third container 24 placed on top of a second container 19. In this example, the third container 24 houses, for example, components of a transformer mechanism 9. In this example, the third container 24 houses a circuit breaker GCB2, which is different from the circuit breaker GCB1 in the first container 18. The third container 24 is made of, for example, metal. A transformer connection part 15 is attached to the side of the third container 24.

[0020] The gas-insulated switchgear 1 includes a partition section 20 (hereinafter referred to as the second partition section 26) that separates the housing chamber 23 of the second container 19 from the housing chamber 25 of the third container 24. The second partition section 26 is, for example, an adapter flange. The second partition section 26 is formed in a plate shape when viewed from the side. The material of the second partition section 26 is, for example, metal. The inside of the housing chambers 22, 23, 25 and the transformer connection section 15 are each filled with insulating gas.

[0021] (Opening / closing section 12) As shown in Figures 3 and 4, the opening / closing section 12 has a first contact 30 attached to an insulating spacer 29 that insulates the power path within the housing 5 from the partition section 20, and a second contact 31 that is paired with the first contact 30. In this example, the first contact 30 is a fixed contact, and the second contact 31 is a movable contact.

[0022] The first contactor 30 has, for example, a main body 32 and a fixed contact portion 33 provided at the tip of the main body 32. The main body 32 has a head portion 32a to which the fixed contact portion 33 is attached, and a leg portion 32b that supports the head portion 32a at a position near the base end of the head portion 32a. The first contactor 30 stands on the insulating spacer 29 by the leg portion 32b. The fixed contact portion 33 is formed, for example, in a substantially cap shape with a hole 34 in the center, and the axis L1 of the hole 34 is oriented along the horizontal direction (the X-axis direction as shown in Figure 3, etc.). An elastic body 35 for fixing the fixed contact portion 33 to the main body 32 is attached inside the fixed contact portion 33. The elastic body 35 is, for example, a spring.

[0023] The second contact 31 includes, for example, a contact 38 that moves linearly toward or toward the first contact 30, a support base 39 positioned on the upper surface of the first compartment 21, a rod 40 integrally fixed coaxially to the contact 38, and a sliding part 41 on which the linearly moving contact 38 slides. A conductor 42, which serves as a power path to the downstream side of the second contact 31, is sandwiched between the support base 39 and the sliding part 41. The support base 39 is formed of an insulating material to insulate the second contact 31 from the first compartment 21. The second contact 31 has a hole 43 for inserting the rod 40. The hole 43 is formed such that its axis L2 extends in the horizontal direction (the X-axis direction as in Figure 3, etc.).

[0024] The sliding portion 41 has an outer dome-shaped first sliding piece 44 and a second sliding piece 45 positioned inside the first sliding piece 44. The second sliding piece 45 is a seat for mounting the first sliding piece 44. An elastic body 47 is mounted inside the first sliding piece 44 for fixing the first sliding piece 44 to the second sliding piece 45. The elastic body 47 is, for example, a spring. In the second contactor 31, a hole 43 for inserting the contact 38 and the rod 40 is formed across the support base 39, the first sliding piece 44, and the second sliding piece 45.

[0025] The rod 40 is formed to extend horizontally (in the X-axis direction as shown in Figure 3, etc.) by being positioned horizontally, for example. A contact 38 is attached to the tip of the rod 40, and an operating mechanism 46 that causes the rod 40 to reciprocate linearly is connected to the base end. The contact 38 and the rod 40 are moved linearly horizontally by the operating mechanism 46, thereby opening and closing the opening / closing section 12. In this way, the opening / closing section 12 opens and closes the current by moving the contact 38 horizontally (in the X-axis direction as shown in Figure 3, etc.) of the housing 5 to make contact with or not make contact with the first contact element 30.

[0026] The opening / closing section 12 is positioned such that, when viewed from the side, the contact 38 takes a path that crosses the central axis C1 of the first compartment 21. Viewing the opening / closing section 12 from the side means, for example, viewing the gas-insulated switchgear 1, which has a front-to-back orientation, from the side. The central axis C1 is, for example, the axis located in the center of the gas-insulated switchgear 1 in the front-to-back direction within the first compartment 21.

[0027] The opening and closing of the opening / closing section 12 is switched by an operating mechanism 46 installed on the control panel 4. To close the opening / closing section 12, the operating mechanism 46 moves the rod 40 linearly in the direction approaching the first contact 30 (direction of arrow A1 in Figure 3). When the tip of the contact 38 enters the hole 34 of the first contact 30 and touches the fixed contact portion 33, the opening / closing section 12 becomes closed (state in Figure 4). On the other hand, to open the opening / closing section 12, the operating mechanism 46 moves the rod 40 linearly in the direction away from the first contact 30 (direction of arrow A2 in Figure 4). When the tip of the contact 38 detaches from the hole 34 and returns to its original retracted state, the opening / closing section 12 becomes open (state in Figure 3).

[0028] (Three-phase integrated structure) As shown in Figure 5, the power relay method in the gas-insulated switchgear 1 is a three-phase integrated type, in which one phase flows through each of the three power relay paths. For this reason, a switchgear 12 is provided for each phase. Specifically, there are a total of three switchgear 12s, one for the U phase, one for the V phase, and one for the W phase. The switchgear 12a for the U phase, the switchgear 12b for the V phase, and the switchgear 12c for the W phase are arranged side by side in the width direction (Y-axis direction in Figure 5) of the gas-insulated switchgear 1 (housing 5).

[0029] (Insulating spacer 29) As shown in Figure 2, the insulating spacer 29 includes a first insulating spacer 29a that insulates the power path between the first container 18 and the second container 19 from the first compartment 21, and a second insulating spacer 29b that insulates the power path between the second container 19 and the third container 24 from the second compartment 26.

[0030] As shown in Figures 3 and 4, the insulating spacer 29 is attached to the partition 20 to insulate the conductor 48 of the first contact 30, which is located in the partition 20, from the partition 20. The insulating spacer 29 is attached and fixed to the opening 49 formed in the partition 20. The insulating spacer 29 is attached and fixed to the periphery of the opening 49 so that it is exposed to the inside of the second container 19 through the opening 49.

[0031] The insulating spacer 29 has a conductor insertion portion 50 through which a conductor 48 extending vertically (in the Z-axis direction as shown in Figure 3, etc.) from the first contact 30 is inserted, and a flange portion 51 integrally formed around the conductor insertion portion 50. The insulating spacer 29 is made of an insulating material such as epoxy resin. The insulating spacer 29 is positioned laterally with respect to the housing 5. That is, the orientation of the insulating spacer 29 is horizontal, with the axis of the hole 52 for inserting the conductor 48 perpendicular to the plane of the compartment 20. The first insulating spacer 29a is fixed so that the upper surface of the flange portion 51 abuts against the back surface of the first compartment 21.

[0032] The conductor insertion portion 50 is formed with a bulging shape on both its upper and lower surfaces, and multiple conductor insertion portions are provided for each first contact 30. The conductor insertion portion 50 is attached to the compartment 20 such that one of the bulging portions on the upper and lower surfaces is positioned within the opening 49. The hole 52 formed in the conductor insertion portion 50 penetrates in the vertical direction (Z-axis direction as shown in Figure 3, etc.). One end of the conductor 48 of the insulating spacer 29 fixed to the first compartment 21 is connected to the main body 32 of the first contact 30, and the other end is connected to the circuit breaker GCB1 of the power receiving mechanism 8.

[0033] The insulating spacer 29 is positioned offset from the central axis C1 of the partitioned section 20 in the direction of movement of the contact 38 (direction of arrow A1 in Figure 3 and direction of arrow A2 in Figure 4). Specifically, the insulating spacer 29 is positioned a predetermined amount offset radially outward from the central axis C1 shown in Figure 3 of the partitioned section 20.

[0034] As shown in Figure 5, the insulating spacer 29 is composed of a single component that insulates the multiple switchable sections 12 from the partition section 20. The conductor insertion section 50 in this example includes, for example, a first conductor insertion section 50a for attaching the first contact 30 of the U-phase switchable section 12a, a second conductor insertion section 50b for attaching the first contact 30 of the V-phase switchable section 12b, and a third conductor insertion section 50c for attaching the first contact 30 of the W-phase switchable section 12c. The first to third conductor insertion sections 50a to 50c are arranged in a direction perpendicular to the direction of movement of the contact 38.

[0035] (Foreign object containment section 54) As shown in Figures 3 and 4, the compartment 20 (in this example, the first compartment 21) has a foreign matter containment section 54 for containing foreign matter present inside the second container 19. Thus, the gas-insulated switchgear 1 in this example has a foreign matter containment section 54 in the compartment 20. The foreign matter is, for example, metallic foreign matter generated when the contact 38 slides against the first contact element 30. The metallic foreign matter is, for example, metal fragments that have peeled off from the contact 38 or the first contact element 30. The foreign matter also includes, for example, arc products and dust that enters the container during operation.

[0036] The foreign matter containment section 54 contains foreign matter present inside the second container 19 below at least a portion of the region in which the contact 38 moves between the first contact 30 and the second contact 31 (hereinafter referred to as the movement region Ea). The foreign matter containment section 54 is, for example, a groove 55 formed on the upper surface of the compartment 20. Preferably, the groove 55 is formed in a tapered shape such that the groove depth R3 is deepest in the center.

[0037] As shown in Figure 2, it is preferable that the foreign matter containment section 54 contains foreign matter below the first opening / closing section 13 and the second opening / closing section 14. That is, one foreign matter containment section 54 contains foreign matter generated in both the first opening / closing section 13 and the second opening / closing section 14.

[0038] As shown in Figure 5, the foreign matter containment section 54 is formed in a shape that surrounds at least a portion of the insulating spacer 29 along the opening 49. In this example, the foreign matter containment section 54 is preferably formed in a shape that is approximately a semi-circular arc (approximately the letter C) in a plan view. In this way, one foreign matter containment section 54 contains foreign matter from multiple opening / closing sections 12.

[0039] (Effect of the embodiment) Next, the operation of the gas-insulated switchgear 1 of this embodiment will be described. As shown in Figure 4, when the contact 38 slides against the first contact 30 and the second contact 31 during the opening and closing operation of the opening / closing section 12, the surface may peel off, potentially generating foreign matter (metallic foreign matter). This foreign matter falls down due to its own weight and accumulates below. For example, if this foreign matter accumulates on the insulating spacer 29, an electric field may be generated between the opening / closing section 12 and the compartment section 20 using the foreign matter as a medium, which would impair the assurance of insulation performance. Furthermore, if foreign matter larger than a certain size is left to accumulate, for example, when a lightning surge occurs, the foreign matter may stand up or float due to the induction phenomenon of the lightning surge, which would also impair the assurance of insulation performance of the opening / closing section 12.

[0040] Therefore, in this example, a foreign matter containment section 54 is provided on the upper surface of the partition section 20 below at least a portion of the movement area Ea of the contact 38. As a result, even if foreign matter is generated when the contact 38 slides against the first contact 30 or the second contact 31, the foreign matter that falls down can be contained in the foreign matter containment section 54. This makes it difficult for foreign matter to reach the insulating spacer 29, thus making it less likely for the insulation performance of the switching section 12 to deteriorate.

[0041] When the foreign matter containment section 54 is a groove 55, the parameters of the groove shape include, for example, "groove length R1 (see Figure 3)", "groove width R2 (see Figure 5)", and "groove depth R3 (see Figure 3)". The groove length R1 is preferably a value greater than or equal to the spacing between the first contact 30 and the second contact 31 (in this example, equivalent to the movement area Ea). The groove width R2 is preferably a value greater than or equal to the width Ka of the contact 38. The groove depth R3 is preferably a value greater than or equal to half the length of the expected foreign matter.

[0042] As shown in Figure 6, if the foreign matter containment portion 54 is a groove 55, it is preferable that the inner surface of the groove 55 is processed in a way that can suppress the charge of foreign matter. Specifically, it is preferable that the foreign matter containment portion 54 has a conductive member 57 on at least a part of the inner surface of the groove 55 that suppresses the charge of foreign matter. The conductive member 57 is preferably a conductive paint 57a, for example. The conductive paint 57a can be made of carbon, aluminum, or the like. The conductive member 57 may also be a plated layer, for example.

[0043] Furthermore, the gas-insulated switchgear 1 in this example has a structure in which the switching unit 12 is positioned on or near the central axis C1 of the compartment 20. In this case, the switching unit 12 can be positioned closer to the center of the compartment 20, thus enabling miniaturization of the gas-insulated switchgear 1. In addition, in this example, the insulating spacer 29 is offset from the central axis C1 of the compartment 20, and a foreign matter containment section 54 is provided below the movement area Ea of the contact 38. Therefore, it is possible to contain foreign matter generated when the contact 38 slides in the foreign matter containment section 54. As a result, it is possible to achieve both miniaturization of the gas-insulated switchgear 1 and capture of foreign matter.

[0044] (Effects of the embodiment) According to the configuration of the above embodiment, the following effects can be obtained. (1) The gas-insulated switchgear 1 has an insulating gas filling the inside of the housing 5, and power is relayed through a path arranged in an atmosphere of insulating gas. The gas-insulated switchgear 1 comprises an switching unit 12, a partition unit 20, and an insulating spacer 29. The switching unit 12 switches the flow of power by moving a contact 38 provided on one of the first contact 30 and the second contact 31 in the horizontal direction of the housing 5 to make contact with or not make contact with the other of the first contact 30 and the second contact 31. The partition unit 20 partitions the second container 19 which houses the switching unit 12 and the first container 18 on which the second container 19 is placed. The insulating spacer 29 is attached to the partition unit 20 to insulate the conductor 48 of the first contact 30 located in the partition unit 20 from the partition unit 20. The compartment 20 has a foreign matter containment section 54 located below at least a portion of the area (movement area Ea) in which the contact 38 moves between the first contact 30 and the second contact 31, for containing foreign matter present inside the second container 19.

[0045] With this configuration, if foreign matter generated during the sliding of the contact 38 falls, this foreign matter is contained in the foreign matter containment section 54, making it less likely for the foreign matter to fall onto the insulating spacer 29. Therefore, it is less likely that the switching section 12 and the partition section 20 will be electrically connected due to foreign matter on the insulating spacer 29. Thus, deterioration of the insulating performance of the insulating spacer 29 can be suppressed.

[0046] (2) The power relay method of the gas-insulated switchgear 1 is a three-phase integrated type in which one phase flows through each of the three power relay paths. Switching units 12 are provided for each phase. The insulating spacer 29 is made up of a single component that insulates the multiple switching units 12 from the partition 20. With this configuration, foreign matter that may be generated from each switching unit 12 can be contained together by a foreign matter containment section 54 provided in a single insulating spacer 29.

[0047] (3) The housing 5 has a multi-stage structure in which a second container 19 is placed on top of a first container 18 in which a circuit breaker GCB1 is housed, and a third container 24 in which another circuit breaker GCB2 is housed is placed on top of the second container 19. With this configuration, deterioration of the insulating performance of the insulating spacer 29 can be suppressed in the gas-insulated switchgear 1 with a multi-stage structure.

[0048] (4) The opening / closing section 12 includes a first opening / closing section 13 that opens and closes the input side of the bus BUS housed in the second container 19, and a second opening / closing section 14 that opens and closes the output side of the bus BUS. The foreign matter containment section 54 contains foreign matter below the first opening / closing section 13 and the second opening / closing section 14. With this configuration, foreign matter that may be generated from each of the first opening / closing section 13 and the second opening / closing section 14 can be contained together by a single foreign matter containment section 54.

[0049] (5) The opening / closing section 12 is positioned such that when viewed from the side, the contact 38 takes a path that crosses the central axis C1 of the compartment 20. The insulating spacer 29 is positioned offset from the central axis C1 in the direction of movement of the contact 38. With this configuration, if the opening / closing section 12 is positioned such that the contact 38 takes a path that crosses the central axis C1 of the compartment 20, the opening / closing section 12 will be positioned near the center of the compartment 20. By positioning the opening / closing section 12 near the center of the compartment 20 in this way, the radial size of the compartment 20 can be reduced, and consequently, the gas-insulated switchgear 1 (housing 5) can be miniaturized. Furthermore, for the miniaturized gas-insulated switchgear 1, the opening / closing section 12 is positioned offset from the central axis C1 of the compartment 20, and a foreign matter containment section 54 is provided in the area created by the offset to contain foreign matter. Thus, it is possible to suppress deterioration of the insulating performance of the insulating spacer 29 and to miniaturize the gas-insulated switchgear 1 at the same time.

[0050] (6) The compartment 20 has an opening 49 that exposes the insulating spacer 29 attached to the compartment 20 to the inside of the second container 19. The foreign matter containment section 54 is formed in a shape that surrounds at least a portion of the periphery of the insulating spacer 29 along the opening 49. With this configuration, it is possible to form the foreign matter containment section 54 over a wide area along the periphery of the insulating spacer 29, so that more foreign matter can be contained in the foreign matter containment section 54.

[0051] (7) The foreign object containment section 54 is a groove 55 formed on the upper surface of the compartment 20. With this configuration, the foreign object containment section 54 can be provided in the compartment 20 by the simple method of forming a groove 55 in the compartment 20.

[0052] (8) The foreign matter containment section 54 has a conductive member 57 on at least a portion of the inner surface of the groove 55. With this configuration, even if an electric charge is attached to the foreign matter contained in the foreign matter containment section 54, this charge can be grounded by the conductive member 57. Therefore, the foreign matter contained in the foreign matter containment section 54 is less likely to become charged, which further contributes to ensuring the insulation performance of the switching section 12. In addition, even if a lightning surge or switching surge enters the circuit, the charge received by the foreign matter can be reduced.

[0053] (9) The conductive member 57 is a conductive paint 57a. With this configuration, the conductive member 57 can be provided on the inner surface of the groove 55 by a simple configuration of applying paint to the inner surface of the groove 55.

[0054] (Other embodiments) This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0055] As shown in Figure 7, the conductive member 57 may be a metal mesh 57b. In this case, foreign matter captured by the metal mesh 57b can be firmly retained in the metal mesh 57b. Therefore, foreign matter contained in the foreign matter containment section 54 can be prevented from escaping from the foreign matter containment section 54 by the metal mesh 57b. The metal mesh 57b is preferably made of stainless steel or copper, for example.

[0056] As shown in Figure 8, the conductive member 57 may be a conductive metal plate 57c. In this case, the conductive member 57 can be made of a simple metal plate. The insulating spacer 29 is not limited to being shared by multiple switching parts 12, but may also be provided individually for each switching part 12.

[0057] The planar shape of the insulating spacer 29 is not limited to a perfect circle; for example, it may be an ellipse or a square. The foreign object containment section 54 is not limited to being shared by multiple opening / closing sections 12, but may also be provided individually for each opening / closing section 12.

[0058] The foreign matter containment portion 54 is not limited to being formed to a size corresponding to the entire movable region Ea of the contact 38. It is sufficient for the foreign matter containment portion 54 to be formed to be large enough to correspond to at least a portion of the movable region Ea. Furthermore, the foreign matter containment portion 54 may be formed to be larger than the movable region Ea.

[0059] The foreign object containment section 54 is not limited to the groove 55, but may also be composed of other members, for example, arranged on the upper surface of the compartment 20. In this way, the foreign object containment section 54 only needs to be capable of capturing foreign objects.

[0060] The second container 19 may be configured such that the second opening / closing section 14 is omitted and only the first opening / closing section 13 is provided. The position of the opening / closing section 12 in the partition section 20 is not limited to a position close to the central axis C1, but may also be a position away from the central axis C1.

[0061] The insulating gas may be a gas other than SF6. The first contact 30 may be on the movable side and the second contact 31 on the fixed side. The first container 18 is not limited to the container of the power receiving mechanism 8, but may also be a container of another mechanism.

[0062] The second container 19 is not limited to the container of the connection mechanism 7, but may also be a container of another mechanism. The gas-insulated switchgear 1 is not limited to a three-stage structure; for example, it may have a two-stage structure. For example, the third container 24 of the third stage may be omitted, and the transformer connection part 15 may be connected to the second container 19 of the second stage.

[0063] • The gas-insulated switchgear 1 is not limited to a three-phase integrated type; it may also be a device that relays power in only one circuit. The gas-insulated switchgear 1 is not limited to the cable-pull type as in the embodiment, but may also be a bushing-pull type, for example.

[0064] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the scope of equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or less of those elements, fall within the scope and concept of this disclosure. [Explanation of Symbols]

[0065] 1…Gas-insulated switchgear 5…Cabinet 12…Opening / Closing Section 13…First opening / closing section 14…Second opening / closing section 18...First container 19…Second container 20... Sectional area 24…Third container 29…Insulating spacer 30...First contact 31...Second contact 38... Contact 49...Aperture 54... Foreign object containment section 55...Groove 57... Conductive material Ea…Mobile Field GCB1…breaker GCB2…breaker BUS…bus C1…Central Axis

Claims

1. A gas-insulated switchgear in which an insulating gas is filled inside the enclosure and power is relayed through a path arranged in the atmosphere of the insulating gas, An opening / closing mechanism that opens and closes the current by moving a contact provided on one of the first and second contacts in the horizontal direction of the housing to make contact with or not make contact with the other of the first and second contacts, A partition section that separates the second container housing the opening and closing section from the first container on which the second container is placed, To insulate the conductor of the first contact arranged in the partition from the partition, an insulating spacer is attached to the partition, The partitioned portion has a foreign matter containment portion for containing foreign matter present inside the second container, located below at least a portion of the area in which the contact moves between the first contact and the second contact, in a gas-insulated switchgear.

2. The aforementioned power relay method is a three-phase integrated type in which one phase is passed through each of the three paths that relay the power. The opening and closing section is provided for each phase, The gas-insulated switchgear according to claim 1, wherein the insulating spacer is composed of a single component that insulates the plurality of opening / closing sections from the partition section.

3. The gas-insulated switchgear according to claim 1, wherein the housing has a multi-stage structure in which a second container is placed on top of a first container housing a circuit breaker, and a third container housing another circuit breaker is placed on top of the second container.

4. The opening / closing section includes a first opening / closing section that opens and closes the input side of the busbar housed in the second container, and a second opening / closing section that opens and closes the output side of the busbar. The gas-insulated switchgear according to claim 1, wherein the foreign matter containment section contains the foreign matter below the first opening / closing section and the second opening / closing section.

5. The opening and closing section is arranged such that, when viewed from the side, the contact takes a path that crosses the central axis of the partitioned section. The gas-insulated switchgear according to claim 1, wherein the insulating spacer is positioned at a location offset from the central axis in the direction of movement of the contact.

6. The partitioned portion has an opening that exposes the insulating spacer attached to the partitioned portion to the inside of the second container. The gas-insulated switchgear according to claim 1, wherein the foreign matter containment portion is formed in a shape that surrounds at least a portion of the periphery of the insulating spacer along the opening.

7. The gas-insulated switchgear according to claim 1, wherein the foreign matter containment portion is a groove formed on the upper surface of the partition portion.

8. The gas-insulated switchgear according to claim 7, wherein the foreign matter containment section has a conductive member on at least a portion of the inner surface of the groove.

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