JPS6235326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated switchgear, and more particularly to a gas insulated switchgear in which the arrangement of a composite gas insulated switchgear is improved.

Conventionally, the layout configuration of composite gas insulated switchgear is as follows:
For example, it is configured as shown in FIG. In other words, 1 in the figure shows SF ₆ in a horizontally grounded tank.
A switching device, that is, a shear disconnector, which stores a sheath and a sheath along with gas, 2 is an air bushing, and this bushing 2 is supported by a disconnector 3, and one terminal part 4 of the disconnector 3 is connected to the sheath and disconnector 1. It is connected to the terminal section 4'. 5 is a pedestal that supports the disconnector 3; 6 is a current transformer;
7 is a grounding device. In such an arrangement, the pedestal 5 for supporting the disconnector 3 placed on the disconnector 1 is necessarily tall, and the pedestal 5 is required to set the level in the installed state. 5 and the legs of the tank of the disconnector 3 require liner adjustment or dimensional adjustment using jack bolts. Furthermore, in order to ensure the seismic strength of the aerial bushing 2 during an earthquake, the members constituting the pedestal 5 must necessarily be strong.

Furthermore, when transporting and installing composite gas-insulated switchgear on-site, it is preferable to transport gas-filled equipment for low voltage classes in order to shorten the on-site installation period as much as possible and maintain the quality confirmed at the factory. Considering this, it is preferable not to have the frame 5 in order to transport the product within the transport limit without disassembling it as much as possible.

The present invention has been made in view of the above points, and has a structure that allows for integrated transportation as much as possible, reducing on-site construction,
It is an object of the present invention to provide a gas insulated switchgear that can improve reliability.

An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 21 denotes a shear disconnector in which a shear cutter is housed inside a horizontally placed grounding tank and an insulating gas is filled in. Terminals 2 are attached to the upper part near both ends of the tank in the axial direction.
3 and 23' are provided in a protruding manner. Reference numerals 22 and 22' indicate current transformers arranged outside the terminal portions 23 and 23'. Reference numerals 24 and 24' designate disconnectors in which a disconnecting section is housed in a tank placed in parallel with the shingle breaker 21 and an insulating gas is sealed therein; one of the disconnectors 24 is One terminal portion thereof is connected to one terminal portion 23 of the shield breaker 21, and an air bushing 26 is installed at the other terminal portion. The other disconnector 24' has one terminal connected to the other terminal 23' of the breaker 21, and an air bushing 26' is installed on the other terminal. The disconnectors 24 and 24' placed on the terminal parts 23 and 23' of the disconnector 21 are arranged facing each other in a straight line, and the details between the opposing surfaces will be described later. A mechanically rigid connection is provided by a connecting member, for example, a connecting pipe member 27. Nao25,2
5' indicates a grounding device attached to the case of the disconnector 24, 24'. FIG. 3 is a sectional view of a main part showing details of the attachment part of the connection pipe member 27 mentioned above. A disconnector 24 is installed at the end of the connecting pipe member 27.
A connecting flange 27a facing the case lid 24a of
This flange 27a is provided with a hole for screwing in a jack bolt 28, and a screw hole for fixing a stud is provided in the case lid 24a opposite to this hole. A stud 29 has one end fixed to a screw hole in the case lid 24a, and the free end of the stud 29 extends through the hole in the flange 27a. Further, the stud 29 is arranged concentrically with the jack bolt 28. Reference numerals 30 and 31 denote an insulating plate and a backing plate disposed between the surfaces of the case lid 24a facing the flange 27a. A nut 34 is screwed into the free end of the stud 29 via an insulating washer 32 and a washer 33. Thus, the insulating washer 32 comes into contact with one end of the bolt 28, and the other end of the bolt 28 contacts the backing plate 31.
It's starting to come into contact with. 35 is stud 2
This is an insulating collar 35 provided on the outer periphery of the case lid 24a and the jack bolt 28 by this, the insulating plate 30, and the insulating washer 32. In FIG. 3, by changing the tightening force of the nut 34 of the stud 29, the distance between the end of the connecting pipe member 27 and the case lid 24a can be adjusted. This is useful for adjusting the dimensions of the terminal portions 23 and 23' of the cutter 21 shown in FIG. 2.

Returning to FIG. 2, if the disconnectors 24 and 24' are connected via the connecting pipe member 27 shown in FIG. 3, one turn of induced current flowing through the case of each component will be formed. do not have. That is, in Fig. 2, the main circuit current I flows as shown by the dotted line, but due to induction by this main circuit current I, a current flows in the opposite direction to the main circuit current between the cases.
Since the disconnectors 24 and 24' are insulated and connected by the insulating part of the contact pipe member 27, one turn is not formed. Therefore current transformer 2 due to induced current
2, 22' can be prevented from malfunctioning.

On the other hand, even if the air bushings 26, 26' are shaken by an earthquake or vibration during transportation, the disconnector 24,
24' is supported by the connecting pipe member 27 and the terminal portions 23, 23' of the shingle breaker 21, so the direction of the weak axis during vibration is the vertical direction in FIG. Since the vibration behavior of the air bushings 26, 26' on both sides is considered to be almost the same, the overall rigidity is determined by the bending rigidity of the legs reinforcing the terminal parts 23, 23' of the cutter 21. be done. Normally, the legs of a gas shield disconnector are designed to have sufficient bending rigidity during vibrations, as air bushings are installed at the terminals when using a single shield. There is. Considering this, it is unlikely that the structure of the present invention described above poses a problem in terms of strength. Conversely, in the conventional configuration shown in Fig. 1, a pedestal 5 is added, but with this, the initially set bending load at the time of vibration is not applied to the legs of the cutter or cutter. This is unreasonable from a strength perspective.

Therefore, according to the configuration of the present invention, the original strength balance is exhibited. Furthermore, since the pedestal 5 is not required, level adjustment work during assembly and installation is also not required.
Even in the event of a sudden stop or start during one-piece transportation, since the disconnectors 24 and 24' are mechanically connected, they can also act as reinforcing materials and reduce the excitation force applied to the air bushings 26 and 26'. Can be reduced. Furthermore, by omitting the frame 5, the current transformer 2
It is also possible to reduce the number of insulating sections for preventing malfunctions of the parts 2 and 22', which also has an economical effect.

As explained above, according to the present invention, the connecting pipe member connects the disconnectors on both sides arranged on the disconnector, and the structure has an air bushing planted on the disconnector. Therefore, it is possible to provide a gas insulated switchgear which not only can omit a frame but also can simplify transportation and installation, and can improve quality reliability.

In the above embodiment, a tank-shaped member similar to the disconnector is used as the connecting pipe member, but the present invention is not limited to this, and the section modulus can be secured to be the same as that of the case of the disconnector. For example, it may be a welded structure using section steel, and in that sense it can be called a connecting member.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional gas-insulated switchgear, FIG. 2 is a front view of an embodiment of the gas-insulated switchgear according to the present invention, and FIG. 3 is a sectional view of essential parts showing an embodiment of the connecting member. It is. 21... Gas shield breaker, 22, 22'... Current transformer,
23, 23'...Terminal section, 24, 24'...Disconnector, 2
6, 26'...Air bushing, 27...Connecting member.

Claims (1)

[Scope of Claims] 1. A grounding tank having a shroud section housed together with an insulating gas in a horizontally placed grounding tank, and having first and second terminal sections protruding from both sides of the upper part of the grounding tank. a disconnector, and a first disconnector in which a disconnection section is housed in a tank together with an insulating gas, protrudes from a lower part of the tank, and is mechanically and electrically connected to a first terminal of the disconnector. and a second terminal provided protruding from the upper part of the tank.
a first disconnector having a terminal section; a disconnector section is housed in a tank together with an insulating gas; the disconnector is provided protruding from the bottom of the tank;
The first terminal is mechanically and electrically connected to the terminal section of the
a second disconnector having a terminal part and a second terminal part protruding from the upper part of the tank;
first and second air bushings that are respectively planted on the second terminal portions of the first and second disconnectors and are mechanically and electrically connected;
A gas insulated switchgear comprising a connecting member that is mechanically connected between opposing surfaces of a tank of a second disconnector and electrically insulates both disconnectors. 2. The gas insulated opening device according to claim 1, wherein a current transformer is fitted into each of the terminal portions protruding from the grounding tank of the breaker.