JP6623622B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas insulated switchgear. In particular, it relates to a cubicle-type gas insulation device (C-GIS).

  A gas insulated switchgear is a protection device in which a circuit breaker, disconnector, lightning arrestor, power detector, and the like are integrated in a panel (for example, Patent Documents 1 and 2). The gas insulated switchgear is configured by arranging a power receiving unit, an instrument transformer / current transformer (PCT) unit, a transformer primary unit, a bus division unit, and the like selected according to the application.

  As shown in FIG. 2, in the power receiving unit of the gas insulated switchgear 25, the inside of the housing 2 is partitioned by partitions 3, 4, 5, and a bus room 6 and an equipment room 7 are formed. These two spaces are filled with an insulating gas such as sulfur hexafluoride gas or dry air.

  A bus 10 is provided in the bus bar 6. On the other hand, a cable head (chd) 11 for receiving power as a gas insulated switchgear 25 is provided on one side surface of the equipment room 7. The bus 10 is connected to the cable head 11 via a disconnector with ground switch (EDS) 26, a vacuum circuit breaker (VCB) 8, a disconnector with ground switch (EDS) 27, and the main circuit conductor 9. You. The operation device 28 of the vacuum circuit breaker 8 is housed in an operation device room 29 outside the device room 7, and the operation device (not shown) of the disconnector 27 with a grounding switch is connected to the operation device room outside the device room 7. 30.

  The vacuum circuit breaker 8 is supported between a fixed case 31 also serving as a fixed conductor and a movable case 32 also serving as a movable conductor. The fixed case 31 is supported inside the equipment room 7 by a support insulator 33, and is connected to the disconnecting switch 26 with a grounding switch via a connecting conductor 34. The movable case 32 is supported inside the equipment room 7 by the support insulator 35, and is connected to the disconnecting switch 27 with the ground switch via the connection conductor 36.

  The disconnector 27 with a ground switch includes a shield 37, a conductor 38 and a movable rod 39. The shield 37 is provided so as to cover the conductor 38 and conducts with the conductor 38. The shield 37 reduces the electric field of the conductor 38 (and the movable bar 39). The movable bar 39 is provided so as to be movable in the axial direction while slidingly contacting the conductor 38. In other words, the movable rod 39 connected to the conductor 38 comes into contact with and separates from the main circuit conductor 9 to open and close the disconnecting switch 27 with the ground switch. The shield 37 is electrically connected to the movable case 32 of the vacuum circuit breaker 8 via the connection conductor 36.

  The main circuit conductor 9 is supported in the equipment room 7 by the support insulator 40 and connected to the cable head 11. The main circuit conductor 9 is provided with a line ground switch (ES) 12 and a lightning arrester (LA) 13.

  As described above, in the gas insulated switchgear 25, devices such as the vacuum circuit breaker 8 and the disconnecting switch 27 with a grounding switch are grounded, and are collectively stored in the device room 7 in which low-pressure insulating gas is sealed.

JP-A-2000-41308

  In the gas insulated switchgear, further space saving is required for the substation equipment. For example, by reducing the height or weight of the gas insulated switchgear, the transportation of the gas insulated switchgear is facilitated, and the degree of freedom in arrangement is improved.

  In view of the above circumstances, an object of the present invention is to provide a technology that contributes to downsizing of a gas insulated switchgear and reduction in the number of parts.

  The gas insulated switchgear of the present invention that achieves the above object has a gas in which a circuit breaker and a main circuit conductor connected to the circuit breaker via a disconnector are housed in a housing filled with an insulating gas. An insulated switchgear, provided at a fixed end of the circuit breaker, a fixed case connected to a fixed lead of the circuit breaker, provided inside the fixed case, and provided at the fixed case. It is characterized by comprising a conductive portion that has been conductive, and a movable rod that is provided so as to be able to slidably contact with the conductive portion and to be separated from and connected to the main circuit conductor, and that is capable of switching the open / close state of the disconnector. I have.

  According to the above invention, the size of the gas insulated switchgear can be reduced. Further, the number of parts of the gas insulated switchgear can be reduced.

It is an important section enlarged sectional view of a gas insulated switchgear concerning an embodiment of the present invention. It is a longitudinal section of the gas insulated switchgear concerning a conventional technology.

  A gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiment, a specific desirable embodiment will be described. However, the gas insulated switchgear of the present invention is not limited to the embodiment, and may be appropriately designed within a range that does not impair the features of the invention. Modifications are possible, and the modified form also belongs to the technical scope of the present invention. In the description of the embodiment, the same components as those of the gas insulated switchgear 25 according to the related art illustrated in FIG. 2 are denoted by the same reference numerals, and different configurations will be described in detail.

  In the gas insulated switchgear 1 according to the embodiment of the present invention, similarly to the gas insulated switchgear 25 according to the related art shown in FIG. 6. An equipment room 7 is formed. These two spaces are filled with an insulating gas such as sulfur hexafluoride gas or dry air. Then, the bus 10 provided in the bus room 6 is connected to the cable head 11 via the vacuum circuit breaker 8 and the main circuit conductor 9 provided in the equipment room 7. The main circuit conductor 9 is provided with a line ground switch 12 and an arrester 13.

  As shown in FIG. 1, the fixed case 14, which also serves as the fixed conductor of the vacuum circuit breaker 8, is supported inside the equipment room 7 by the support insulator 15. That is, the fixed-side case 14 is provided at the fixed-side end of the vacuum circuit breaker 8 and is electrically connected to a fixed-side lead (not shown) of the vacuum circuit breaker 8. Although not shown, a movable case also serving as a movable conductor of the vacuum circuit breaker 8 is provided at the upper end of the vacuum circuit breaker 8, and between the movable case and the fixed case 14. A vacuum circuit breaker 8 is supported. The movable case is connected to the disconnecting switch 26 with a ground switch via the connection conductor 34.

  A cylindrical conductor 16 is provided inside the fixed side case 14, and a movable bar 17 is provided through the conductor 16. One end of the movable bar 17 is connected to an operation bar 18 capable of moving the movable bar 17 in the axial direction. The operation rod 18 is provided through the support insulator 15, and is connected to a DS operation device (not shown). That is, the disconnecting switch (DS) 19 is constituted by the DS operating device, the operating rod 18, the movable rod 17, the conductor 16, the fixed side case 14, and the like. The fixed case 14 also serves as a shield for the movable bar 17. For example, by forming the fixed case 14 so as to cover the conductor 16, the electric field of the conductor 16 (and the movable bar 17) is reduced. You. A ground electrode 20 for grounding the disconnector 19 is provided at the end of the support insulator 15 opposite to the side where the fixed case 14 is provided. The ground electrode 20 is provided with a ground electrode contact 21 to which the end of the movable rod 17 can be separated.

  The main circuit conductor 9 is provided separately from the fixed case 14. The main circuit conductor 9 is provided with a fixed contact 22 to which the end of the movable bar 17 can be separated.

  The conductor 16 is provided with a DS contact 23 and an ES contact 24 that can slide on the movable bar 17. The DS contact 23 is provided at an end of the conductor 16 on the side facing the main circuit conductor 9. Then, in a state where the DS contact 23 and the movable bar 17 are in contact with each other, the end of the movable bar 17 comes into contact with the fixed-side contact 22 provided on the main circuit conductor 9, so that the fixed-side case 14 and the main circuit conductor 9 Will be conducted. On the other hand, the ES contact 24 is provided at an end of the conductor 16 on the side facing the ground electrode 20. When the movable rod 17 is in contact with the ES contact 24 and the end of the movable rod 17 contacts the ground electrode contact 21 provided on the ground electrode 20, the fixed-side case 14 is grounded. .

[Operation of disconnector]
Next, the operation of the disconnector 19 (that is, the operation of the movable bar 17) will be described. The operation of the disconnector 19 is performed by a DS operator. That is, the DS operating device moves the movable bar 17 in the axial direction via the operation bar 18 and switches the position of the movable bar 17. Then, depending on the position of the movable rod 17, (1) a state in which the disconnector 19 is turned on, (2) a state in which the disconnector 19 is turned off, and (3) a state in which the disconnector 19 is grounded (a state in which the grounding switch ES is turned on). It will be.

(1) The state in which the disconnector 19 is included One end of the movable rod 17 is connected to the fixed contact 22 of the main circuit conductor 9. At this time, the other end of the movable bar 17 is in contact with the DS contact 23, and the main circuit conductor 9 is electrically connected to the fixed case 14 via the movable bar 17 and the conductor 16. That is, the main circuit conductor 9 is electrically connected to the vacuum circuit breaker 8 and the bus 10.

(2) Disconnector 19 cut off state The end of the movable rod 17 is separated from the fixed contact 22 of the main circuit conductor 9. At this time, the other end of the movable rod 17 is at a position where it does not contact the ground electrode contact 21. That is, the circuit between the main circuit conductor 9 and the vacuum circuit breaker 8 is open.

(3) Disconnector 19 is Grounded One end of the movable rod 17 is connected to the ground electrode contact 21. At this time, the other end of the movable rod 17 is in contact with the ES contact 24, and the fixed case 14 is connected to the ground electrode 20 via the conductor 16 and the movable rod 17.

  According to the gas insulated switchgear 1 according to the embodiment of the present invention as described above, the fixed-side case 14 provided at the end of the cutoff unit (for example, the vacuum circuit breaker 8), the shield of the disconnector 19, Are not required, a connecting conductor for connecting between the fixed-side case 14 and the shield of the disconnector 19 becomes unnecessary. As a result, the connection between the vacuum circuit breaker 8 and the disconnector 19 can be reduced in size, and the gas insulated switchgear 1 can be reduced in size. Further, the number of parts constituting the gas insulated switchgear 1 can be reduced.

  In addition, by integrating the shield of the fixed case 14 and the shield of the disconnector 19, the shield of the fixed case 14 and the shield of the disconnector 19 can be simultaneously fixed by the support insulator 15. Further, the fixing strength of the fixed case 14 and the fixing strength of the disconnector 19 can be secured by the support insulator 15. In addition, the operation rod 18 of the disconnector 19 is provided through the fixed side case 14, so that the operation of the disconnector 19 and the operation of the vacuum circuit breaker 8 can be performed by one operator.

  Further, by arranging the ground electrode contact 21, the conductor 16, and the fixed contact 22 on the same straight line, the disconnector 19 can be switched by the three-position operation of the movable rod 17. That is, the operation mechanism of the disconnector 19 has a simple structure.

1, 25 ... gas insulated switchgear 2 ... housing, 3, 4, 5 ... partition wall, 6 ... bus room, 7 ... equipment room 8 ... vacuum circuit breaker (breaker), 9 ... main circuit conductor, 10 ... bus line 11 ... Cable head, 12 ... Line ground switch, 13 ... Lightning arrester 14 ... Fixed side case, 15 ... Support insulator, 16 ... Conductor (conductive part)
Reference numeral 17: movable rod, 18: operation rod, 19: disconnector 20: ground electrode, 21: ground electrode contact, 22: fixed side contact 23: DS contact, 24: ES contact 26, 27: disconnector with ground switch

Claims (2)

A gas-insulated switchgear in which a circuit breaker and a main circuit conductor connected to the circuit breaker via a disconnector are housed in a housing filled with an insulating gas,
A fixed-side case provided at a fixed-side end of the circuit breaker and electrically connected to a fixed-side lead of the circuit breaker;
A conduction portion provided inside the fixed side case and conducted to the fixed side case,
A movable rod that is slidably contactable with the conductive portion and detachably connected to the main circuit conductor, and that can switch an open / close state of the disconnector,
A ground electrode that is provided apart from the fixed case in the axial direction of the movable bar, and that can ground the fixed case via the conductive portion and the movable bar ;
A gas-insulated switchgear , wherein an end of the movable rod is inserted into a support insulator interposed between the fixed-side case and the ground electrode, and comes into contact with the ground electrode. . The stationary case, a gas insulated switchgear according to claim 1, characterized in that it is formed to cover the conductive portion.

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