JP5178571B2 - Gas insulated switch - Google Patents

Description

  The present invention relates to a gas insulation disconnecting device in a gas insulated switchgear used in a power plant, a substation or the like.

  In general, in an electric station such as a power plant or a substation, SF6 gas or other insulating gas is sealed in a sealed container, and further, the inside of the sealed container is gasified using an insulating spacer or the like, and the main circuit A gas-insulated switchgear comprising a high-voltage conductor that forms a structure supported in a state of being electrically insulated from a sealed container is used. This gas-insulated switchgear has a disconnector that opens to disconnect the accident part or inspection part from the main circuit, and a grounding switch that grounds the part disconnected by this disconnector. There is known a gas insulation disconnecting device in which a grounding switch is configured in a common sealed container. For example, as a conventional gas-insulated disconnection device, a sealed container having a branch portion branched in a direction perpendicular to a main portion extending linearly in the axial direction is formed, and these branch portions are connected to other components. There is known one used for the purpose (for example, see Patent Document 1).

  On the other hand, the gas-insulated switchgear includes an instrument transformer (hereinafter referred to as VCT), a grounded instrument transformer (hereinafter referred to as EVT), a connection bus connecting between adjacent lines, Various components such as a transformer (hereinafter referred to as TR) may be connected.

JP-A-8-223717

  However, in the conventional gas-insulated switchgear, sufficient consideration has not been given to the case where the number of components that are detachably connected from the main circuit conductor by the gas-insulated disconnecting device is increased. In other words, in the sealed container used in the conventional gas-insulated disconnector, when the number of components to be added increases, the number of the sealed containers described above corresponding to the number of the components is limited because the connecting portion is limited. Had to concatenate. For example, when connecting the components of VCT, EVT, common bus, and TR via disconnectors, the above-mentioned gas insulation disconnecting device must be connected to each of these components, and the configuration of the connecting portion is complicated. It will increase in size.

  An object of the present invention is to provide a gas-insulated disconnecting device capable of connecting other components with a simple configuration without increasing the size of the gas-insulating switchgear.

  In order to achieve the above object, the present invention constitutes a disconnector having a fixed contact portion and a movable contact portion that can be opened and closed with respect to the fixed contact portion in a sealed container filled with an insulating gas. In the gas-insulated disconnecting device configured to open and close the movable contact portion by an operation arranged outside the closed vessel, the closed vessel is a cross-shaped closed vessel in which connecting portions are respectively formed in four directions. A fixed connection conductor is disposed in an inner central portion of the hermetic container in a state of being electrically insulated from the cross-shaped hermetic container, and the fixed contact portion is provided on each of the fixed connection conductors located in the vicinity of each connecting portion. In addition, the movable contact portions that can be opened and closed with respect to the fixed contact portions are arranged to constitute four disconnectors, and the movable contact portions of the disconnectors are driven to open and close outside the sealed container. 4 Characterized in that of arranging the operating device.

  According to the gas insulated disconnecting device of the present invention, four operating devices are arranged close to each other, and the disconnecting device is configured in the vicinity of each connecting portion formed in the four directions in the cross-shaped sealed container. Therefore, the operation devices are not brought close enough to interfere with each other as in the case where each movable contact portion is arranged at the center in the cross-shaped airtight container. As a result, it is possible to arrange each operating device in the remaining space on the outer periphery thereof by taking advantage of the cross-shaped feature of the cross-shaped closed container while appropriately dispersing each operating device. The entire insulation disconnecting device can be configured in a small size. Further, the configuration of the fixed connection conductor is simplified and the support configuration thereof is also simplified.

FIG. 1 is a cross-sectional view showing a gas insulation disconnecting device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the gas insulation disconnecting device shown in FIG. FIG. 3 is a side view of the gas insulation disconnecting device shown in FIG. FIG. 4 is a front view of a gas insulated switchgear using the gas insulated disconnecting device shown in FIG. FIG. 5 is a plan view of the gas insulated switchgear shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a gas insulation disconnecting device according to the present invention.
This gas insulation disconnect device is configured in a substantially cruciform sealed container 1, and the cruciform sealed container 1 includes connecting portions 1a and 1d formed by flanges at both axial ends of a main body portion 7 extending in the horizontal direction, Connecting portions 1b and 1c formed by flanges are provided at the ends of the branch portions 8 and 9 extending in the vertical direction at the axially intermediate portion of the main body portion 7, respectively.

  The connecting portion 1a formed on the left side of the main portion 7 of the cruciform airtight container 3a is connected to the airtight container 1a of another component via an insulating spacer 21a, and is positioned above the cruciform airtight container 3a. The connecting portion 1b of the branching portion 8 is connected to a sealed container 4a of another component via an insulating spacer 21b, and the connecting portion 1c of the branching portion 9 positioned below the cross-shaped sealed container 3a is insulated. The sealed container 5a of another component is connected via the spacer 21c, and the right side connecting portion 1d of the main portion 7 of the cross-shaped sealed container 3a is sealed to the other component via the insulating spacer 21d. The container 6a is connected. In this way, the four connecting portions 1a to 1d formed in the four directions of the cruciform sealed container 1 are connected to four other constituent elements, the details of which will be described later, and the respective insulating spacers provided in the connecting portions 1a to 1d. The gas space in the cross-shaped airtight container 3a is divided from others by 21a-21d.

  Inside such a cross-shaped airtight container 1, disconnectors 26a, 26b, 26c, and 26d, which will be described in detail later, are configured in the vicinity of the connecting portions 1a to 1d. These disconnectors 26a to 26d are a three-phase collective type in which three-phase components are configured in a common cross-shaped airtight container 1, but since each phase has almost the same structure, the following is detailed for one phase. explain.

  A substantially cross-shaped fixed connection conductor 13 is disposed in the central portion where the main body portion 7 and the branch portions 8 and 9 constituting the cross-shaped sealed container 3a intersect. The fixed connection conductor 13 is formed in a substantially cross shape by a portion extending along the main body portion 7 and branch portions 22b and 22c branched at substantially right angles at positions corresponding to the branch portions 8 and 9. The fixed connection conductor 13 is electrically connected to the cross-shaped sealed container 3a by using a plurality of insulating supports 15a and 15d fixed at one end to the plates 14a and 14d fixed to the inner wall of the cross-shaped sealed container 3a. It is supported and fixed in an insulated state. A disconnector 26a with a grounding device is formed between the left end of the fixed connection conductor 13 and the insulating spacer 21a, and a grounding device is provided between the upper end of the branching portion 22b of the fixed connecting conductor 13 and the insulating spacer 21b. A disconnector 26b is configured, and a disconnector 26c with a grounding device is configured between the lower end of the branching portion 22c of the fixed connection conductor 13 and the insulating spacer 21c, and a right end of the fixed connection conductor 13 is also provided. And an insulating spacer 21d constitute a disconnector 26d with a grounding device.

Next, the configuration of the above-described disconnector with grounding device 26a will be described.
A connecting conductor 10a is fixed to the central conductor of the insulating spacer 21a, and the base side of the movable contact portion 11a is rotatably connected to the connecting conductor 10a. A fixed contact portion 12a is disposed opposite to the free end side of the movable contact portion 11a, and the fixed contact portion 12a is fixed to the fixed connection conductor 13 described above. As will be described in detail later, an operating device 20a is connected to the movable contact portion 11a via an insulating rod 16a, and the movable contact portion 11a is driven to open and close with respect to the fixed contact portion 12a by this operating device 20a. A grounding fixed contact 17a that contacts the movable contact portion 11a when the contact portion 11a is driven from the disconnection position to the grounding position is provided. This grounding fixed contact 17a is led out from the cross-shaped sealed container 3a by an insulating terminal 19a in an electrically insulated state.

The above-mentioned disconnector with grounding device 26d is similarly configured.
A connection conductor 10d is fixed to the central conductor of the insulating spacer 21d, and the base side of the movable contact portion 11d is rotatably connected to the connection conductor 10d. A fixed contact portion 12d is disposed opposite to the free end side of the movable contact portion 11d, and the fixed contact portion 12d is fixed to the fixed connection conductor 13. Further, as will be described in detail later, an operating device 20d is connected to the movable contact portion 11d via an insulating rod 16d, and the movable contact portion 11d is driven to open and close with respect to the fixed contact portion 12d by the operating device 20d and is movable. A grounding fixed contact 17d that contacts the movable contact portion 11d when the contact portion 11d is driven from the disconnection position to the grounding position is provided. The grounding fixed contact 17d is led out from the cross-shaped sealed container 3a by an insulating terminal 19d in an electrically insulated state.

  Further, regarding the configuration of the disconnector 26c with the grounding device described above, the connecting conductor 10c is fixed to the central conductor of the insulating spacer 21c described above, and the base side of the movable contact portion 11c is rotatable on the connecting conductor 10c. The fixed contact portion 12c is disposed opposite to the free end of the movable contact portion 11c, and the fixed contact portion 12c is fixed to the fixed connection conductor 13 via the branch portion 22c. Further, as will be described in detail later, an operating device 20c is connected to the movable contact portion 11c via an insulating rod 16c, and the movable contact portion 11c is driven to open and close with respect to the fixed contact portion 12c by this operating device 20c. A grounding fixed contact 17c that contacts the movable contact portion 11c when the contact portion 11c is driven from the disconnection position to the grounding position is provided. The grounding fixed contact 17c is also led out from the cross-shaped sealed container 3a by the insulating terminal 19c in a state of being electrically insulated.

  The same applies to the disconnector 26d with the grounding device described above, and the connecting conductor 10b is fixed to the central conductor of the insulating spacer 21b described above, and the base side of the movable contact portion 11b is rotatably connected to the connecting conductor 10b. The fixed contact portion 12b is arranged opposite to the free end of the movable contact portion 11b. The fixed contact portion 12b is fixed to the fixed connection conductor 13 via the branch portion 22b. Further, as will be described in detail later, an operating device 20b is coupled to the movable contact portion 11b via an insulating rod 16b, and the movable contact portion 11b is driven to open and close with respect to the fixed contact portion 12b by the operating device 20b. A grounding fixed contact 17b that comes into contact with the movable contact portion 11b when the contact portion 11b is driven from the disconnection position to the grounding position is provided. The ground fixed contact 17b is led out from the cross-shaped sealed container 3a by an insulating terminal 19b in an electrically insulated state.

  In the disconnectors 26a and 26d with the grounding device, the three-phase fixed connection conductors 13 are juxtaposed on the horizontal plane, so only one phase is displayed, whereas in the disconnectors 26b and 26c with the grounding device, the juxtaposition direction However, considering the fact that three phases are displayed, the disconnectors 26a to 26d with grounding devices have different opening and closing operation directions as shown in the above description, but the overall basic configuration is substantially the same. It is. Furthermore, the structure of the operation system in each disconnector 26a-26d with a grounding device is demonstrated.

  One ends of links 25b and 25c are connected to the operating devices 20db and 20c arranged outside the cross-shaped sealed container 3a, and the other ends of the links 25b and 25c are rotated by receiving operating force from the operating devices 20db and 20c. The rotary shafts 24b and 24c are mechanically connected. Although not shown in detail, the operation devices 20a and 20d have the same configuration and have the same rotation shafts 24a and 24d, respectively, and the insulation rod 16a is rotated by rotating the rotation shafts 24a and 24d. , 16b, the movable contact portions 11a, 11d are rotated, and the movable contact portions 11a, 11d can be opened from the fixed contact portions 12a, 12d.

2 is an enlarged view representative of the disconnector 26d with the grounding device, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. Will be described.
An airtight holding member 18d is provided on the side wall of the cruciform sealed container 3a, and the rotary shaft 24d is inserted from the outside to the inside of the cruciform sealed container 3a while being kept airtight by the airtight holding member 18d. The side end is rotatably held by a bearing 27d. An intermediate portion of the movable contact portion 11d is connected to the rotation shaft 24d via an insulating rod 16d, and the movable contact portion 11d rotates around the connection portion with the connection conductor 10d as the rotation shaft 24d rotates. . In addition, the movable contact portion 11d is configured to take three positions by the operation device 10d. That is, the closed position of the disconnector where the movable contact portion 11d contacts the fixed contact portion 12d as indicated by the solid line, and the disconnector position where the movable contact portion 11d is separated from the fixed contact portion 12 as indicated by the alternate long and short dashed line. As shown by the dotted line, the disconnecting position and the grounding position of the grounding switch in which the movable contact portion 11d is separated from the stationary contact portion 12 and in contact with the grounding stationary contact 17d can be taken. Thus, it can be seen that each of the disconnecting switches 26a to 26d with the grounding device is an integral configuration of the disconnecting switch and the grounding switch.

  The three-phase collective configuration has been described above, but as shown in FIG. 3, one end of the three-phase insulating rod 16d is connected to the rotating shaft 24d in the axial direction, and the other end of each insulating rod 16d is connected. Are respectively connected to the movable contact portions 11d for three phases. Therefore, when the rotary shaft 24d is rotationally driven by the operation device 20d, the movable contact portion 11d for three phases is simultaneously opened and closed to operate as a three-phase collective type. Such a three-phase collective configuration is the same for the other disconnectors 26a to 26c with grounding devices.

  By the way, when the four grounding device disconnectors 26a to 26d are configured in one cross-shaped sealed container 1, it is necessary to consider the arrangement of the relatively large four operating devices 20a to 20d. However, here, the operating devices 20a to 20d can be appropriately dispersed and arranged outside the cross-shaped sealed container 3a. For example, the operating device 20b and the operating device 20c are arranged on the side portions of the branch portions 8 and 9 as shown, and the operating device 20a and the operating device 20d are not shown in detail, but the operating devices 20b and 20c are omitted. Can be arranged at the side portions of the main body portion 7 so as not to interfere with each other, but may be arranged at other positions. In any case, four operating devices 20a to 20d are arranged close to each other, but a grounding device-attached disconnection is provided in the vicinity of each of the connecting portions 1a to 1d formed in the four directions in the cross-shaped sealed container 1. Since the devices 26a to 26d are configured, an appropriate interval is obtained between the disconnecting devices 26a to 26d with the grounding device, whereby the operating devices 20a to 20d can be disposed in an appropriately dispersed manner. In addition, since the operation devices 20a to 20d can be arranged in the remaining space on the outer peripheral portion of the cross-shaped airtight container 1 by utilizing the characteristics of the cross shape, the entire gas insulation disconnecting device can be configured in a small size. Can do.

  Further, when the gas insulated disconnector is configured, the fixed connection conductor 13 is fixed to the intermediate portion in the cruciform sealed container 1 by the insulating supports 15a and 15d, and the four disconnectors are connected to the fixed connection conductor 13 at predetermined positions. Since the fixed contact portions 12a to 12d are fixed to constitute the disconnectors 26a to 26d with the grounding device, the configuration of the fixed connection conductor 13 is simplified and the support configuration thereof is also simplified. At this time, since the fixed connection conductor 13 is disposed in the center portion in the cross-shaped sealed container 1, compared to the case where the movable contact portions 11a to 11d are intensively disposed and configured in the center portion in the cross-shaped sealed container 1. Thus, the four grounding device disconnectors 26 a to 26 d can be arranged somewhat apart from the center of the cross-shaped sealed container 1. Accordingly, the operation devices 20a to 20d of the disconnecting devices 26a to 26d with the grounding devices can be arranged without being close enough to interfere with each other.

  In addition, each of the disconnecting devices 26a to 26d with the grounding device can have almost the same basic configuration although the opening and closing directions are different, so that an inexpensive gas-insulated disconnecting device can be obtained. Further, in this embodiment, when the movable contact portions 11a to 11d are further operated than the disconnection position of the disconnecting device separated from the fixed contact portions 12a to 12d, the movable contact portions 11a to 11d are connected to the ground fixed contacts 17a to 17a. Since the disconnecting devices 26a to 26d with the grounding device in which the disconnecting switch and the grounding switch are integrally configured so as to come into contact with 17d are used, the number of the operating devices for the disconnecting switch and the grounding switch is determined as follows. Compared with the case where it comprises separately, as a result, the magnitude | size of the cross-shaped airtight container 1 can be suppressed.

Next, a gas insulated switchgear configured using the above-described gas insulated disconnecting device will be described. 4 and 5 are a front view and a plan view of the gas insulated switch.
This gas insulated switch constitutes one line, and as can be seen from FIG. 4 in particular, VCT2, EVT4, connection bus 5 connected to other lines, TR6 are other components on the power receiving side such as a circuit breaker. As shown in FIG. The VCT 2 is fixed to the attached surface, and the reciprocating conductor unit 3 is used to connect the VCT 2 to a power receiving side such as a circuit breaker. In the reciprocating conductor unit 3, the main circuit conductor on the power receiving side such as a circuit breaker is drawn downward at one end, connected to the VCT 2, and raised again to arrange the main circuit conductor at the same level. Thereafter, the EVT 4, the connection bus 5, and the TR 6 are connected as other components to the main circuit conductor on the power receiving side such as a circuit breaker so as to be separable from the main circuit conductor via a disconnector.

  Therefore, a gas insulation disconnecting device 28 is connected to the reciprocating conductor unit 3. This gas insulation disconnecting device 28 is as shown in FIG. 1, and since the cruciform sealed container 1 has four connecting portions 1a to 1d, the connecting portion 1a is connected to the sealed container 3a of the reciprocating conductor unit 3. The airtight connection. Then, since the three connecting portions 1b to 1d remain in the cross-shaped sealed container 1, the EVT 4 is connected to the connecting portion 1b using this, the connecting bus 1 is connected to the connecting portion 1c, and the connecting portion 1d is further connected to the connecting portion 1d. TR6 is connected. As described above, the gas insulation disconnecting device 28 uses the cross-shaped airtight container 3a in which the branch portions 8 and 9 branched in the vertical direction are respectively formed at the axially intermediate portion of the main body portion 7 extending in the horizontal direction. Therefore, the three connecting portions with the other components which are the EVT 4, the connection bus 5, and the TR 6 without increasing in size in the axial direction of the main body portion 7 and without increasing in size in the axial direction of the branch portions 8 and 9. Can be easily obtained.

  Moreover, since the disconnectors 26a to 26d with grounding devices are formed in positions corresponding to the connecting portions 1a to 1d in the cross-shaped sealed container 3a of the gas insulation disconnecting device 28, VT4, common bus 5 and TR6 are This means that the disconnectors 26a to 26d with the grounding device can be separated from each other.

  For example, in the above-described gas insulated switchgear, when disconnecting the VCT 2 from other parts, an opening operation of the disconnector 26a with the grounding device is performed. Specifically, the operating device 20a is driven to rotate the rotary shaft 24a via the link 25a. By rotating the rotary shaft 24a, the movable contact portion 11a is disconnected from the fixed contact portion 10a through the insulating rod 16a connected to the rotary shaft 24a and driven to the disconnecting device disconnecting position, and then the movable contact portion 11a is fixed to the ground. The contact 17a is brought into contact with the ground switch. Therefore, inspection or the like can be performed by grounding the main circuit conductor of VCT2.

  Moreover, in the gas insulated switchgear described above, when the EVT 4 is disconnected from other parts, the opening operation of the disconnector 26b with the grounding device is performed. Specifically, the operating device 20b is driven to rotate the rotary shaft 24b via the link 25b. When the rotary shaft 24b is driven to rotate, the movable contact portion 11b is disconnected from the fixed contact portion 10b via the insulating rod 16b connected to the rotary shaft 24b and driven to the disconnecting device disconnecting position, and then the movable contact portion 11b is fixed to the ground. The contact is brought into contact with the contact 17b and the grounding switch is grounded. As a result, the main circuit conductor of the EVT 4 is grounded and can be inspected safely.

  Further, the same applies to the case where the common bus 5 or TR6 is disconnected from other portions, and the disconnection device with grounding device 26c or the disconnection device with grounding device 26d is opened, respectively.

  According to such a gas insulated switchgear, since the gas insulated disconnector 28 using the cross-shaped sealed container 1 having the four connecting portions 1a to 1d is used, the VCT2 , EVT4, connecting bus 5 and other four components which are TR6 can be easily obtained. Moreover, only one cross-shaped sealed container 1 is used, and the configuration of the same part can be configured simply and without increasing the size, and when a plurality of sealed containers are connected as in the conventional case. Compared to the above, the configuration can be simplified, and the attached area can be reduced by downsizing. In addition, since the four operating devices 20a to 20d are arranged relatively close to each other, the maintenance and inspection thereof can be facilitated.

  In the gas-insulated disconnecting device in the above-described embodiment, the disconnecting device and the grounding switch are integrally configured, and after the movable contact portions 11a to 11d are opened to the fixed contact portions 10a to 10d and the disconnecting device is disconnected. The disconnectors 26a to 26d with the grounding device are used in which the movable contact portions 11a to 11d are brought into contact with the ground fixed contacts 16a to 16d to be in the grounded state of the ground switch. The configuration can be taken. For example, the disconnecting switch is configured to be opened and closed with a dedicated operating unit, while the grounding switch is configured to be opened and closed with a dedicated operating unit, and the disconnecting unit has a cross shape as in the previous embodiment. Although it comprises each in the vicinity of the four-way connection parts 1a-1d of the airtight container 1, you may comprise a grounding switch in a convenient position, respectively.

  Even in this case, since the basic structure which comprises a disconnector in the vicinity of each connection part 1a-1d formed in the four directions in the cross-shaped airtight container 1 is the same, a suitable space | interval is obtained between each disconnector. As a result, the operation devices 20a to 20d can be arranged in a moderately dispersed manner. In addition, since the operation devices 20a to 20d can be arranged in the remaining space on the outer peripheral portion of the cross-shaped airtight container 1 by utilizing the characteristics of the cross shape, the entire gas insulation disconnecting device can be configured in a small size. Can do.

  Further, when configuring the gas insulated disconnector, the fixed connection conductor 13 is fixed to the intermediate portion in the cross-shaped sealed container 1 by the insulating supports 15a and 15d, and each of the four disconnectors is fixed to the fixed connection conductor 13 at a predetermined position. Since the fixed contact portions 12a to 12d are respectively fixed to form the disconnector, the basic configuration is the same. Therefore, the configuration of the fixed connection conductor 13 is simplified and the support configuration thereof is also simplified. At this time, since the fixed connection conductor 13 is disposed in the intermediate portion in the cross-shaped sealed container 1, compared to the case where the movable contact portions 11a to 11d are disposed in the intermediate portion in the cross-shaped sealed container 1. The four disconnectors can be arranged somewhat apart from the center of the cross-shaped sealed container 1. Thereby, it becomes possible to arrange | position the operating devices 20a-20d of a disconnecting switch, without making it adjoin, so that it may mutually interfere.

  The gas-insulated disconnecting device of the present invention is not limited to the configuration of the gas-insulated switchgear shown in FIGS. 4 and 5 and can be applied to gas-insulated switchgears having other configurations. For example, the fixed connection conductor 13 disposed in the cross-shaped airtight container 1 and the disconnector comprising the fixed contact portions 10a to 10d and the movable contact portions 11a to 11d are shown as a three-phase collective type, but have a phase separation configuration. In addition, the three-phase collective type is not limited to one in which the phase conductors are juxtaposed on one plane, and the present invention can be similarly applied to one in which each phase conductor is arranged at each vertex of an isosceles triangle. it can.

DESCRIPTION OF SYMBOLS 1 Cross-shaped airtight container 1a-1d Connection part 2 Instrument transformer 3 Reciprocating conductor unit 4 Instrument transformer 5 Connection bus 6 Transformer 7 Main part 8,9 Branch part 10a-10d Connection conductor 11a-11d Movable contact part 12a -12d Fixed contact portion 13 Fixed connection conductor 14a-14d Plate 15a-15d Insulating support 16a-16d Insulating rod 17a-17d Grounding fixed contact 18a-18d Airtight holding member 19a-19d Insulated terminal 20a-20d Actuator 21a-21d Insulating spacers 22a and 22b Branch portions 24a to 24d Rotating shafts 25a to 25d Links 26a to 26d Disconnectors with grounding devices 28 Gas insulating disconnectors

Claims (1)

  A disconnector having a fixed contact portion and a movable contact portion that can be opened and closed with respect to the fixed contact portion is formed in a sealed container filled with an insulating gas, and the movable device is operated by an operation disposed outside the sealed container. In the gas-insulated disconnecting device configured to open and close the contact portion, the sealed container is a cross-shaped sealed container having connecting portions formed in four directions, and the cross-shaped sealed container is formed at an inner central portion of the cross-shaped sealed container. The fixed connection conductors are arranged in a state of being electrically insulated from each other, the fixed contact conductors are provided on the fixed connection conductors located in the vicinity of the respective connecting portions, and can be opened and closed with respect to the respective fixed contact portions. The movable contact portions are arranged to constitute four disconnectors, and the four operating devices for opening and closing the movable contact portions of the disconnectors are arranged outside the sealed container. That the gas insulated disconnecting device.

Images