JPS6243409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduced-sized switchgear in which a disconnector and a vacuum shield are housed in one tank filled with an insulating medium.

Fig. 1 is a single line diagram showing the electrical circuit of a reduced type switchgear, in which a tank 1 containing insulating oil includes a vacuum disconnector 2, a disconnector 3 with a first and second grounding mechanism,
4. A grounding device 5 and a cable connection device 6 are provided. The cable connection device 6 is connected to a power supply side cable (not shown). Note that the tank 1 is provided with a connection bus bar 7 for connection to the load side. This connection bus bar 7 can also be taken out from the tank 1 in other directions 8 and 9 depending on the arrangement of other equipment.

FIG. 2 is a side cross-sectional explanatory view showing the specific structure of FIG. 1 showing a conventional reduced type switchgear, in which the tank
is a disconnection tank 13 mounted and fixed on a base 12;
It is composed of a cutoff tank 14 arranged close to the disconnection tank 13, and especially the tank 13.
Insulating oil is stored inside.

The disconnector tank 13 houses the first and second disconnectors with earthing mechanisms 3 and 4, the earthing device 5, etc.
At its bottom, the cable connection devices 6 for each phase (only one phase is shown in FIG. 2) to which the cable head 16 of the cable 15 on the power supply side is connected are installed. , a terminal 18 is inserted through the insulator tube 17 and extends rearward (rightward in FIG. 2).
It is equipped with A contact 20 of the grounding device 5 for discharging the charging current of the cable 15 is provided on the end side of each terminal 18 so as to be able to come into contact with and separate from it, for example, during maintenance and inspection of the cable or the switchgear. In addition, each terminal 18 is connected to a connecting conductor 2.
1 to the first disconnector 3 with a grounding mechanism. Note that the grounding device 5 is connected to the disconnection section tank 13.
It is operated by an operating device (not shown) provided on the outside of the machine. Further, the contactor 20 is connected to the grounded base 12 via a lead 22.

A rectangular hole 23 is provided in the rear wall (the right side wall in FIG. 2) of the disconnection section tank 13, and the first and second disconnectors 3 and 4 with earthing mechanisms are installed in this hole 23. It is closed by a mounting plate 24. Below the mounting plate 24, there are
As shown in the figure, the first disconnectors 3 with a grounding mechanism for three phases are installed at appropriate distances in the horizontal direction (left and right direction in FIG. 3). Further, above the mounting plate 24, a second disconnect switch 4 with a grounding mechanism for three phases is appropriately spaced apart in the horizontal direction, and each first
It is installed at a position corresponding to the disconnector 3 with a grounding mechanism. The first and second grounding mechanism equipped disconnectors 3 and 4 are connected to each phase by the vacuum disconnector 2 for each phase, which is disposed behind the disconnection tank 13 (to the right in FIG. 2), as described later. This is for disconnecting the power supply side and load side of each phase of the vacuum shield breaker 2 from the power supply and the load in the circuit that has been disconnected, and also for grounding the power supply side and the load side.

The first and second disconnectors with earthing mechanisms 3 and 4 are connected to the third
As shown in the figure, since the mechanisms are the same, one phase of the first disconnector 3 with a grounding mechanism will be briefly described below as an example. In FIG. 3, 30 is a cone-shaped insulating spacer, 31 is a common contact, 32a and 32b are earthing/disconnecting contacts and connection contacts arranged in a straight line at equal distances above and below from the common contact 31; 33 is a movable blade. The movable blade 33 is attached to a connecting member 34 that moves each phase together.
are link mechanisms 35a and 35 arranged on the left and right sides in the figure.
b, it is operated as shown by the two-dot chain line in FIG. 36 is a drive shaft interlockingly connected to a drive source 37, and this shaft 36 connects the link mechanisms 35a, 35b.
is operated as shown by the two-dot chain line in FIGS. 4 and 5.

50 is a connecting conductor, and this connecting conductor 50 is connected to the connecting contact 42b of the second disconnector 4 with a grounding mechanism. 51 is a branch connection conductor branched from the connection conductor 50, and 52 is an insulating spacer attached to the front wall of the disconnection tank 13. Reference numeral 53 represents a connection bus bar for each phase connected to a device not shown.

As shown in FIG. 2, behind the disconnection tank 13 housing the first and second earthing mechanism equipped disconnectors 3 and 4, the sheath disconnection tank 14 is arranged in parallel. This crinkle section 14 is erected on an operating device 54 mounted and fixed on the base 12. Inside the sheath section tank 14, there are vacuum shear disconnectors 2 for each phase, which are operated by the operation device 54 to be turned on and off.
(In Fig. 2, only one phase is shown) is installed upright, and the lower terminal 55 of each vacuum shield breaker 2 is
The connection portion 31a of the common contact 31 of each phase in the first disconnector with a grounding mechanism 3 and the connection conductor 5
Further, the upper terminal 57 of each vacuum disconnector 2 is connected to the connection portion 41a of the common contact 41 of each phase in the second disconnector 4 with a grounding mechanism through a connection conductor 58. . In Figure 2,
59 is a conservator provided at the upper part of the disconnection section tank 13, and 60 is a duct.

In the conventional reduced type switchgear configured as described above, the tanks 13 and 14 that house the first and second grounding mechanism disconnectors 3 and 4 and the vacuum shield disconnector 2 are assembled separately, and the tanks 13 and 14 are assembled separately, and the They are connected to each other by connecting conductors 56, 58 and a duct 60 on the base 12. For this reason, there are the following drawbacks.

(a) When downsizing the entire device, the interconnection of devices must be done in a narrow space, so it is not easy to install the duct 60, and there is a limit to the improvement of work efficiency.

(b)Although it is still possible to reduce the insulation distance, it is also possible to store the main equipment in separate tanks.
There is a limit to further miniaturization due to the space required for assembling equipment and interconnecting conductors to configure one device.

(c) There is an insulating medium (for example, oil) in the disconnection tank 13 having the first and second disconnectors 3 and 4 with grounding mechanisms.
However, since there are many members penetrating the tank 13, there are many sealing points in those parts, which requires a lot of management to prevent leakage of the insulating medium.

In order to eliminate the above-mentioned drawbacks, this invention houses a disconnector and a disconnector in a single tank, improves the reliability of preventing leakage of the insulating medium in the tank, and downsizes the entire device. It is an object of the present invention to provide a reduced-sized switchgear designed to improve the workability of equipment manufacturing.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 7 to 10. The same parts as in FIGS. 1 to 6 are designated by the same reference numerals. 7 and 8 are a front view and a side view of the reduced type switchgear according to the present invention, in which an operating device 54 for a sheath cutter is placed and fixed on one side of the base 12, and the operating device 54 is An intermediate base 71 having the same size as the base 12 is fixed to the upper surface of the operating device 54 without providing a ceiling plate. The portion of the intermediate base 61 where the operating device 54 is not provided is used as a mounting portion for the cable head 16, the grounding device 5, etc., and is supported by a column 63 via an auxiliary base 62, as shown in FIG. As shown in FIG. 9, a vacuum sheath disconnector 2 is erected on an intermediate base 61 above the operating device 54, and a holding frame 64 is used to surround and support the vacuum sheath disconnector 2. The holding frame 64 is fixed on the intermediate base 61. A frame-shaped disconnector support frame 65 with a grounding mechanism is arranged separated from this holding frame 64 by a predetermined distance.The lower end of this support frame 65 is fixed to the intermediate base 61, and the upper end is supported by the holding frame 64. The support frame 65 is firmly fixed by being connected via the member 66. Attached to the support frame 65 is a mounting plate 24 for fixing the first and second disconnectors 3 and 4 with earthing mechanisms in two rows vertically.

The grounding attachment 5 is arranged and fixed on the lower intermediate base 61 of the first earthing disconnector 3, and the cable head 16 is provided passing through the intermediate base 61, and the penetration portion is sealed.

After arranging the vacuum disconnector 2, the first and second disconnectors with grounding mechanism 3, 4, the grounding attachment 5, etc. on the intermediate base 61 as described above, one surface of the lower part is opened and the other On the fifth side, a closed tank 67 is placed on the intermediate base 61 so as to cover each of the devices from above. A flange 6 is attached to the open end of the tank 67.
8 is provided in advance to facilitate attachment to the intermediate base 61. Said tank 67
Reinforcing materials 90 are appropriately provided on the side walls of five sides, and manholes (portions A, B, and C in FIGS. 7 and 8) are formed, for example, on the side walls of predetermined three sides. These manholes A, B, and C are used for work inside the tank 67 from outside the tank 67 (assembly work, etc.)
It serves as an entrance and exit when carrying out the process, and also serves as a conductor through hole. The conductor is supported and sealed by an insulating support member 52. As shown in FIG. 10, on the reinforcing member 90 of the tank 67, drive devices 37, 47 for operating the first and second earthing mechanism disconnectors 3, 4 and the earthing device 5 are attached to mounting plates 71, 81. Fixed via. Although not shown, the tank 67 is provided with an insulating medium injection and discharge port.
Tank 67 is filled with an insulating medium, for example oil, gas insulator SF ₆ .

The drive devices 37, 47 include a motor reducer 72,
82, and the output shafts 73, 83 of the motor reducers 72, 82 are connected to the drive shafts 36, 4 of the first and second disconnectors 3, 4 via universal joints 74, 84, respectively.
46. The universal joints 74, 84 have bearings 75, 85 that pass through the tank wall and reinforcement 90.
It is provided inside and sealed by sealing materials 76 and 86. A drive shaft 91 of the grounding device 5 is attached to a link 92. This drive shaft 91 is driven by a drive device 93 having the same configuration as the drive devices 37 and 47 described above. The drive device 93 is the reinforcing material 9
It is fixed to a mounting plate 94 provided at 0 and has a motor reducer 95 inside.
The output shaft 96 is connected to the link 92 via a universal joint 97.
It is connected to a connecting shaft 98 fixedly attached to the connecting shaft 98 . The universal joint 97 is fitted into a bearing 99 provided through the tank wall and the reinforcing member 90 and sealed with a sealing material 100. Incidentally, the flange 68 of the tank 67 and the intermediate base 61 are fixed via a packing 101 with bolts and nuts 102, 103.
104 is an operating rod of the vacuum shield disconnector 2, and 105 is a hanging ear. Among the manholes A to C, blind plates (not shown) are attached to those that do not allow the conductor to pass through.

The operations of the first and second disconnectors with a grounding mechanism explained in the embodiment of the present invention are performed in the same manner as in FIGS. 2 and 3. In this embodiment, the cable head is sufficiently elevated above the installation surface, making it easy to connect the connecting cable to other equipment. Further, the drive devices 37, 47, 93 of the disconnectors 3, 4 and the grounding device 5 are attached to the reinforcing material 90 of the side wall of the tank 67.
There is no need for a special support member to support the reinforcing member 90. Furthermore, the reinforcing material 90
Bearings 75, 85, 99 are provided in the bearings 75, 85, 99.
Since the universal joints 74, 84, and 97 are fitted to the joints 85 and 99, the hermetic seal can be performed at the joint of the bearing, so the seal can be simple and small, and an improvement in the sealing effect can be expected. .

As described above, according to the present invention, devices such as a disconnector and a grounding device are installed on a common intermediate base, so the main devices can be installed before covering the tank, and the cable head and the first grounding device can be installed before covering the tank. It is easy to connect the conductor to a disconnector with a mechanism and the first and second disconnectors with a grounding mechanism, and the main equipment is covered by a common tank by using a common intermediate base. Therefore, the number of sealing parts can be reduced, leakage of the insulating medium can be reduced, and in particular, a gas insulator such as SF ₆ can be used, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a single line diagram showing the electric circuit of a reduced type switchgear, Fig. 2 is a side cross-sectional explanatory diagram of the specific configuration of Fig. 1 showing a conventional reduced type switchgear, and Fig. 3 is the same as that shown in Fig. 2. Figures 4 to 6 are views in the direction of the arrows of the line, - line, - line, and - line in Figure 3, and Figure 7
8 are a front view and a side view showing an embodiment of the present invention, FIG. 9 is a sectional view taken along the line - in FIG. 7, and FIG. 10 is an enlarged sectional view taken along the line - in FIG. 9. . 2... Vacuum shield disconnector, 3, 4... First and second grounding mechanism disconnector, 12... Base, 16... Cable head,
24... Mounting plate, 54... Operating device, 61... Intermediate base, 67... Tank.

Claims (1)

[Claims] 1. In a switchgear in which a disconnector and a shield disconnector are arranged side by side, an operating device 54 for the disconnector is placed on the base 12, and a vacuum disconnector is installed on the upper surface of the operating device 54 via an intermediate base 61. The vacuum shear cutter 2 is erected to form a shear cutting section, the intermediate base 61 is formed larger than the operating device 54, and the vacuum shear cutter 2 is installed in parallel with the intermediate base 61. A mounting plate 24 is provided,
The disconnectors 3 and 4 are arranged on this mounting plate 24, and the cable head 16 is sealed and penetrated through the intermediate base 61, and the cable head 16, the disconnectors 3 and 4, and the vacuum shield and disconnector 2 are electrically connected to each other. The reduced type switchgear is characterized in that these devices are connected together, covered with a common tank 67 and hermetically fixed to an intermediate base 61, and the tank 67 is filled with an insulating medium.