JP2012143096A - Gas-insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulation switchgear which can simplify an installation work on site and reduce work time by realizing an integrated transportation of a body apparatus part including a power cable head and a control panel.SOLUTION: A gas-insulation switchgear comprises: a body apparatus part 1 which includes, in a sealed metallic container in which an insulation gas is encapsulated as an insulation media, a breaker 2, a main busbar apparatus part 4 which includes a disconnector 6 for a main busbar and a main busbar 5, and a track apparatus part 7 having a disconnector 8 for a track and a power cable head 10; and a control panel 30 which is connected with the body apparatus part 1 by a control cable 31 and controls each of apparatuses provided in the body apparatus part 1. The breaker 2 is installed with the axis oriented in a vertical direction and comprises: a first lead-out part 2a to which the main busbar apparatus part 4 is connected; and a second lead-out part 2b to which the track apparatus part 7 is connected. A height of the second lead-out part 2b from a horizontal surface is higher than that of the first lead-out part 2a and both of the first lead-out part 2a and the second lead-out part 2b face in the same direction.

Description

An embodiment of the present invention relates to a gas insulated switchgear in which an insulating gas such as SF ₆ gas is sealed in a sealed metal container as an insulating medium.

  In the conventional gas-insulated switchgear, a technology has already been established that enables the main equipment unit and the control panel to be transported and installed together. That is, in the conventional gas insulated switchgear, the unit dimensions including the main body device unit, the control cable, and the control panel are set within the limits of the loading space in the transportation equipment such as trailers and trucks.

  As a result, in the field construction of gas-insulated switchgear that can be transported in bulk, the control cable wiring connection work and the confirmation test are not required, and the construction process can be reduced to less than half of the conventional construction. In this way, omitting the local wiring work by transporting the main body unit and the control panel together is an indispensable condition for greatly reducing the construction cost in the field.

  FIG. 3 is a single-line diagram showing a gas insulated switchgear having a double busbar configuration generally applied. 4 is a side view showing the gas insulated switchgear of FIG.

  As shown in FIGS. 3 and 4, the main body device section 1 </ b> A includes a main bus device section 4, a circuit breaker 2, instrument current transformers 25 and 26, and a line apparatus section 7.

  In the main bus device section 4, main bus disconnectors 6 are respectively connected to two main buses 5, and these main bus disconnectors 6 are connected to an instrument current transformer 26. This instrument current transformer 26 is connected to the line disconnector 8 of the line equipment section 7 via the circuit breaker 2 and the instrument current transformer 25. The line equipment unit 7 includes a line disconnector 8, an instrument transformer 9, and a power cable head 10. The main bus device unit 4 includes a ground switch 27, and the line device unit 7 includes ground switches 28 and 29.

  Specifically, as shown in FIG. 4, the instrument current transformer 26 is connected to a lower portion on one side of the circuit breaker 2. An instrument current transformer 25 is connected to the upper part of the other side opposite to the one side of the circuit breaker 2. The instrument current transformer 25 is connected to the line disconnector 8, the power cable head 10, and the instrument transformer 9 in this order in the same direction.

  As shown in FIG. 4, the circuit breaker 2 is installed on the circuit breaker operating mechanism 3. A disconnector operating mechanism 11 is attached to the main bus disconnector 6. The control panel 30 is installed at a constant interval from the disconnector operating mechanism 11. The control panel 30 is connected to the circuit breaker operating mechanism 3 through a control cable 31.

  Thus, the circuit configuration in which the two main buses 5 are connected to the external line via the circuit breaker 2 and via the instrument transformer 25 is common to domestic and foreign electric power companies.

  In addition, due to recent advances in equipment specification rationalization and equipment downsizing technology, even the gas-insulated switchgear for 240 / 300kV-class backbone systems can be used to transport the main unit, control panel, and control cables to the local site. Equipment is being developed.

  For example, in the technique described in Patent Document 1, the main equipment, the control panel, and the control cable can be transported to the site collectively even in the gas insulated switchgear, and can be transported collectively by trailer. In this technology, the transportation cost and transportation time of equipment constituting the substation equipment, and the work cost and working time at the time of field installation are reduced.

JP 2008-301690 A

  However, in the technique described in Patent Document 1 described above, the power transmission line or the transformer side transports the disconnector, the current transformer for the instrument, or the transformer for the instrument on a common basis, up to the power cable head. It was not something that was transported.

  In recent years, a plug-in type power cable has been developed, and this type of power cable can be connected without supplying and exhausting gas. Therefore, if it is possible to assemble and transport the power cable head in a lump, it is possible to expect an improvement in quality because the assembly work at the time of field installation becomes unnecessary.

  Further, as shown in FIG. 4, considering the maintenance and inspection of the normal circuit breaker 2, the disassembly and assembly workability at the time of an accident, the equipment configuration is a circuit breaker at the end of the main bus equipment section 4 of the gas insulated switchgear. 2 is required, and it is necessary to secure a sufficient working space at the side of the circuit breaker 2.

  However, in order to arrange the control panel 30 on the circuit breaker 2 side and shorten the line length direction, for example, a rolling member such as a wheel is attached to the bottom surface of the control panel 30 to control the circuit breaker 2 side. It was necessary to devise such as configuring the board 30 to be movable.

  The present invention has been made in consideration of the above-mentioned circumstances, and realizes collective transportation between the main body equipment unit including the power cable head and the control panel, simplifying the work at the time of field installation and shortening the work time. An object of the present invention is to provide a gas insulated switchgear that can be realized.

  In order to achieve the above object, a gas insulated switchgear according to the present invention comprises a main busbar device section in which a circuit breaker, a main bus disconnector and a main busbar are provided in a sealed metal container filled with an insulating gas as an insulating medium. A main device unit having a line device unit provided with a line disconnector and a power cable head, and a control connected to the main device unit by a control cable and controlling each device provided in the main device unit A circuit board and a gas-insulated switchgear, wherein the circuit breaker is installed with a shaft in a vertical direction, and the first lead-out unit to which the main bus device unit is connected and the line device unit are connected A second mouth portion, the height of the second mouth portion from the horizontal plane is higher than that of the first mouth portion, and the first and second mouth portions are oriented in the same direction. Characterized by being formed That.

1 is a side view showing an embodiment of a gas insulated switchgear according to the present invention. FIG. 2 is an elevation view showing an installation state of the power cable head of FIG. 1. It is a single wire connection diagram which shows the gas insulated switchgear of the double bus line composition generally applied. It is a side view which shows the gas insulated switchgear of FIG.

  Hereinafter, an embodiment of a gas insulated switchgear according to the present invention will be described with reference to the drawings.

  In addition, the same code | symbol is attached | subjected and demonstrated to the part which is the same as that of a conventional structure, or respond | corresponds through FIG. Moreover, the following embodiment demonstrates the case where a power cable head is applied to the gas insulated switchgear comprised by the phase-separation type.

(One embodiment)
(Constitution)
FIG. 1 is a side view showing an embodiment of a gas insulated switchgear according to the present invention.

  As shown in FIG. 1, the gas-insulated switchgear according to the present embodiment is roughly composed of a main device unit 1, a control panel 30, and a control cable 31 that connects the main device unit 1 and the control panel 30. It is configured.

  The main device section 1 has a frame 20 assembled in a lattice shape from a shape member such as H-shaped steel. The frame 20 is a base part that contacts the ground, and a copper bar 15 is partially laid on the upper surface. The frame 20 directly supports the circuit breaker operating mechanism 3 and the control panel 30 of the main device unit 1.

The main unit 1 includes a circuit breaker 2, a main bus disconnector 6, a main bus 5, instrument current transformers 25 and 26, and an instrument for use in a sealed metal container filled with an insulating gas such as SF ₆ gas as an insulating medium. A transformer 9 and a power cable head 10 are provided.

  On the circuit breaker operating mechanism 3, a circuit breaker 2 having a vertical axis is installed. In this circuit breaker 2, two lead portions (branching portions) 2a and 2b are formed on the upper and lower sides, and these two lead portions 2a and 2b face the same direction. In other words, the mouth portion (second mouth portion) 2b is provided at a position where the height from the horizontal plane is higher than the mouth portion (first mouth portion) 2a.

  The main bus device unit 4 is connected to the outlet portion 2a at the lower part of the circuit breaker 2 through a current transformer 26 in the horizontal direction. The main bus device section 4 includes a main bus 5 and a main bus disconnector 6.

  Between the main bus equipment unit 4 and the frame 20, there is a space in which the main bus disconnector 6 can be removed as shown by a two-dot chain line by the height of the disconnector operating mechanism 11. In other words, the height of the lead-out portion 2a is set to a dimension that does not interfere with the main bus bar 5 when the main bus disconnector 6 is removed in the vertical lower part.

  On the other hand, the line device section 7 is connected to the lead-out section 2b at the upper part of the circuit breaker 2 via the instrument transformer 25 in the horizontal direction. The line device section 7 includes a line disconnector 8, an instrument transformer 9, and a power cable head 10.

  Therefore, the circuit breaker 2, the main bus equipment part 4 attached to the lower part of the circuit breaker 2, and the line equipment part 7 attached to the upper part of the circuit breaker 2 are 90 degrees counterclockwise as a whole as viewed from the side. It is formed in a rotated U shape.

  The power cable head 10 is configured as a phase separation type, and is connected to a plug-in type power cable 10a. Therefore, the power cable 10a can be connected to the power cable head 10 without supplying or exhausting gas from the device.

  Further, the power cable head 10 is disposed on the front surface (left side in FIG. 1) of the main bus device unit 4. The power cable 10 a is pulled out through an opening (not shown) in the tray 18 provided on the frame 20. The power cable 10a can be led out in the vertical direction for all three phases, but in the present embodiment, as shown in FIG. 2, the both ends of the three phases are gradually lowered to the opening of the tray 18 as shown in FIG. Is inclined so that the angle α is, for example, 10 degrees with respect to the vertical direction so as to approach the middle phase. These three-phase power cables 10 a are configured to allow the three-phase cable to be inserted through one opening of the tray 18. The power cable 10a is connected to a power transmission line or a transformer (not shown).

  In the present embodiment, the both end phases of the power cable 10a are inclined by 10 degrees with respect to the vertical direction, but are not necessarily limited to this angle and may be in the range of 5 degrees to 10 degrees. In short, as long as the angle is such that the flange 10b of the power cable 10a of each phase does not contact, an angle other than the above range may be used. Moreover, the power cable 10a can be inclined with respect to the vertical direction by changing the mounting angle of the power cable head 10 with respect to the line disconnector 8.

  The control panel 30 is installed at a position facing the circuit breaker 2 with the main busbar device unit 4 and the line device unit 7 interposed therebetween. Therefore, the control panel 30 is in the positional relationship of the circuit breaker 2-main bus equipment unit 4-power cable head 10-control panel 30 in FIG. Further, as shown in FIG. 2, the control panel 30 is near the center in the width direction of the frame 20 so that the width dimension Z in the direction of the main bus 5 is shorter than the line width A of the circuit breaker 2 in the direction of the main bus 5 by about 500 mm or more. Is installed.

  The control panel 30 is connected to the circuit breaker operating mechanism 3 via a control cable 31. The control cable 31 is arranged in advance before product shipment through the tray 18 in the frame 20.

  On the other hand, a disconnector operating mechanism 11 for operating the main bus disconnector 6 and the line disconnector 8 is disposed at the end of the main bus device section 4. The disconnector operating mechanism 11 is arranged such that the lower surface is in contact with the upper surface of the control panel 30. The disconnector operating mechanism 11 is provided with an opening that can be opened and closed on the surface in contact with the control panel 30, and is normally kept open so that the control cable 31 can be passed therethrough.

  Further, the disconnector operating mechanism 11 is connected to the main bus disconnector 6 and the line disconnector 8 via an operation connecting rod 32. The disconnector operating mechanism 11 includes a drive motor (not shown). By driving the drive motor, the driving force is transmitted to the main bus disconnector 6 and the line disconnector 8 via the connecting rod 32. The main bus disconnecting device 6 and the track disconnecting device 8 are configured to be opened and closed.

  The gas monitoring device 12 is disposed on a support plate 33 attached to the upper side surface of the control panel 30 in the vicinity of the control surface of the control panel 30. The gas monitoring device 12 is connected to each device by a pipe 13 so that the insulation gas pressure of each device can be monitored.

  The frame 20 is provided with suspension holes 14 at four corners so as to be lifted by suspension wires 21 integrally with the respective devices. As described above, the copper bar 15 is laid on the upper surface of the frame 20, and the ground wire 16 is connected to the copper bar 15. The ground wire 16 is connected to a ground terminal 22 attached to each device of the main device unit 1. A ground terminal 23 is attached to the frame 20, and the ground terminal 23 is connected to the ground line 24. Therefore, the ground current of each device flows through the ground terminal 22, the ground wire 16, the copper bar 15, the frame 20, the ground terminal 23, and the ground wire 24 in order.

  Note that a space 19 is provided by extending the end of the frame 20 on the side opposite to the lead-out portions 2a and 2b of the circuit breaker 2, and the circuit breaker 2 can be installed even after field installation using this space 19. It can be shifted in the horizontal (horizontal) direction.

  In addition, an electronic impact recording device 17 that records the degree of impact on the main device 1 during transportation is attached near the center of gravity below the main bus device 4.

(Function and effect)
In the present embodiment, the main device unit 1 and the control panel 30 are connected in advance by the control cable 31, so that the main device unit 1 can be transported to the site while being wired to the power cable head 10. . As a result, the work process and work cost for disconnecting the control cable 31 generated at the time of shipment from the factory and the work process and work cost for reconnecting the control cable 31 in the field work can be reduced. Both construction processes in can be shortened.

  In the present embodiment, the length of the transmission line connection direction including the control panel 30, specifically, the dimension Y of the apparatus main body 1 </ b> A including the control panel 30 shown in FIG. By folding back the line device unit 7 and forming the device main body 1 in a U shape when viewed from the side, the dimension X of the device main body 1 shown in FIG. 1 can be reduced to about ½. .

  Incidentally, in the present embodiment, the lead portion 2a to which the main bus equipment section 4 is connected and the lead portion 2b to which the line equipment section 7 is connected are in the same direction, and the height of the lead portion 2b from the horizontal plane is set. By forming it higher than the lead-out portion 2a, the line device portion 7 is folded back with respect to the device main body portion 1A shown in FIG. 4, and the device main body portion 1 is formed in a U shape in a side view.

  Furthermore, in this embodiment, the accessibility to the control panel 30 is not impaired, and the circuit breaker 2 can be removed by using the space 19 in the event of an accident in the circuit breaker 2, so that the patrol inspection performance of the circuit breaker 2 is excellent. In addition, no wiring is required for local installation.

  In this embodiment, the width Z of the control panel 30 in the main bus direction is narrowed by 500 mm or more from the line width A of the frame 20 (the width of the circuit breaker 2 in the main bus direction) A to the main bus equipment unit 4. Therefore, the worker can easily access the power cable head 10.

  In the present embodiment, by sharing the bottom surface of the disconnector operating mechanism 11 with the control panel 30, the wiring of the control cable 31 becomes unnecessary.

  Moreover, this embodiment ensures the workability | operativity of replacement | exchange of the main bus disconnector 6 by providing the space for removing the main bus disconnector 6 under the main bus equipment part 4. FIG.

  In the power cable head 10, the width of the opening provided in the frame 20 can be made narrower than the line width A determined from the equipment by tilting the both ends of the three phases to the middle phase by about 5 to 10 degrees from the vertical direction. Eliminates the need to add extra space. Furthermore, by making the power cable 10a into a plug-in type connection form, there is no need for gas supply / exhaust work on-site, and quality can be improved and work time can be shortened accordingly.

  In this embodiment, by arranging the gas monitoring device 12 in the vicinity of the control surface of the control panel 30, it is possible to effectively use the space in which the width of the control panel 30 is narrower than the line width, and to perform the gas monitoring work. It is possible to concentrate.

  In the present embodiment, by providing the tray 18 and the copper bar 15 using the space in the frame 20 or the upper surface of the frame 20, wiring and grounding work at the site can be omitted.

  In the present embodiment, the electronic shock recording device 17 at the time of transportation is provided in the vicinity of the center of gravity of the frame 20, so that the vibration acceleration at the time of transportation is more accurately evaluated than when it is arranged at the end of the frame 20. It becomes possible.

  As described above, according to the present embodiment, the arrangement of the main device unit 1, the control panel 30 and the control cable 31 at the time of shipment from the factory and the connection structure between them are devised, and the control cable 31 can be moved while connected. It is possible to shorten the local construction process and the product shipment preparation process.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the case where the present invention is applied to a gas insulated switchgear in which a power cable head is configured in a phase separation type is described. However, the present invention is not limited to this, and a three-phase main circuit is accommodated in one gas container. It is also possible to apply to the three-phase batch unit.

DESCRIPTION OF SYMBOLS 1 ... Main body apparatus part, 2 ... Circuit breaker, 2a ... Outlet part (first outlet part), 2b ... Outer part (second outlet part), 3 ... Breaker operation mechanism, 4 ... Main bus equipment part, 5 DESCRIPTION OF SYMBOLS ... Main bus, 6 ... Main bus disconnector, 7 ... Line equipment section, 8 ... Line disconnector, 9 ... Instrument transformer, 10 ... Power cable head, 10a ... Power cable, 10b ... Flange, 11 ... Disconnector operation mechanism, 12 ... gas monitoring device, 13 ... piping, 14 ... suspension hole, 15 ... copper bar, 16 ... ground wire, 17 ... electronic impact recording device, 18 ... tray, 19 ... space, 20 ... frame ( Base part), 21 ... hanging wire, 22 ... ground terminal, 23 ... ground terminal, 24 ... ground line, 25 ... current transformer for instrument, 26 ... current transformer for instrument, 27 ... ground switch, 28 ... ground switch 29 ... ground switch 30 ... control panel 31 ... control cable 32 ... ream Rod, 33 ... support plate

Claims (10)

In a sealed metal container filled with an insulating gas as an insulating medium, a circuit breaker, a main bus disconnecting device, a main bus device unit provided with a main bus, a line disconnecting device, and a line device unit provided with a power cable head are provided. The main device section;
A control panel that is connected to the main device unit by a control cable and controls each device provided in the main device unit,
A gas insulated switchgear comprising:
The circuit breaker is provided with a first outlet part to which the main bus equipment part is connected and a second outlet part to which the equipment unit for the line is connected, with the shaft set as a vertical direction,
The gas insulation, wherein the height of the second lead portion from the horizontal plane is higher than that of the first lead portion, and the first and second lead portions are formed in the same direction. Switchgear.   2. The gas insulated switchgear according to claim 1, wherein the control panel is installed at a position facing the circuit breaker across the main bus device unit and the line device unit.   3. The gas-insulated switchgear according to claim 1, wherein the control panel is fixed to a frame arranged on a horizontal plane, and a width in a main bus direction is narrower than a width in a main bus direction of the circuit breaker. apparatus.   A disconnector operating mechanism for operating the main bus disconnector and the line disconnector is disposed at an end of the main bus device unit, and a lower surface thereof is in contact with an upper surface of the control panel. The gas insulated switchgear according to any one of claims 1 to 3.   The gas insulated switchgear according to any one of claims 1 to 4, wherein a space for removing the main bus disconnector is provided below the main bus equipment section.   6. The power cable according to claim 1, wherein the power cable head is configured in a phase-separated form, and the power cable connected to the power cable head has both end phases inclined to the middle phase side among the three phases. The gas insulated switchgear according to any one of claims.   The gas insulated switchgear according to claim 6, wherein the power cable is plug-in connected to the power cable head.   The gas insulated switchgear according to any one of claims 1 to 7, wherein the frame includes a tray for the control cable passage.   The gas insulated switchgear according to any one of claims 1 to 8, wherein a copper bar is disposed on the upper surface of the frame, and is connected to the main body device part via a ground wire at a plurality of locations.   The gas-insulated switchgear according to any one of claims 1 to 9, wherein a space is provided at an end of the frame so that the circuit breaker can be removed while being laterally displaced.