JPH0345967B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a gas insulated switchgear, and in particular, a pole section consisting of an insulating tube housing a disconnector, a disconnector, a cable, a grounding switchgear, and other equipment. This invention relates to a gas insulated switchgear in which an insulating gas is sealed.

(Prior Art) A conventional gas insulated switchgear will be explained based on FIGS. 1 to 3. In the figures, 1 is a hollow box-shaped tank, and 2 is a footrest that supports the tank 1. The tank 1 houses therein a pole section 3, disconnectors 4, 4a, and cables 5, 5a, and the tank 1 is filled with an insulating gas such as SF ₆ gas. The pole column part 3 has a mounting flange 3a airtightly fixed on the bottom part 1a of the tank 1, a lower insulating cylinder 3b tightly fitted into the mounting flange 3a, and a lower insulating cylinder 3b and an upper insulating cylinder 3d tightly fitted together. The terminal tube 3c is a sealed body consisting of a terminal tube 3c that covers the upper end of the upper insulating tube 3d, and a switch 13 (for example, a vacuum interrupter) is housed inside, and an insulating gas is sealed therein. .

Note that 6 and 6a are connecting conductors, which electrically connect the pole column portion 3 and the disconnectors 4 and 4a. 7 is a grounding switch having a movable piece 7a, and is housed in a case 8 separated from the tank 1. Reference numeral 10 denotes a cable head for pulling out the cable 5a to the outside, and is provided to pass through the case 8 in an airtight manner, and a current transformer 11 is provided at the outer end side of the cable head 10 that protrudes outside the case 8. . A terminal 9 capable of grounding the cable 5a is provided at the inner end of the cable head 10, and the movable piece 7a of the grounding switch 7 is provided.
come into contact and separate. 12 is a sealable operation box that houses the operating mechanism of the switch 13; 12a is a three-phase pole column portion 3;
This is an interlocking box that houses a link mechanism for simultaneous interlocking operation. Reference numerals 14 and 14 denote current collecting contacts, and each current collecting contact 14 is connected to a fixed terminal 13a and a movable terminal 13b of the switch 13, respectively, and is located within the gas pole column 3. Reference numeral 15 denotes an operating rod, which is used to operate the switch 13, and is connected to the movable terminal 13b, and is connected to the operating box 12.
An operating mechanism (not shown) inside the operating box 12
and is made of an insulator.

According to such conventional gas insulated switchgear,
When performing maintenance and inspection of the switch 13, the tank 1
The work requires removing the insulating gas inside, and that work is also extremely troublesome. That is, the operation box 12 attached to the lower part of each pole column 3 is removed from the tank 1, and the switch 13 is removed from the pole column 3 fixed to the bottom plate 1a.
had to be pulled downwards. This extraction work is inconvenient because it is restricted by the height of the footrest 2.Also, the operation box 12 houses the operation mechanism and is heavy, but it is attached integrally with the interlocking box 12a, so the three-phase It is necessary to remove all the operation boxes 12 at the same time, and also to perform repair work after maintenance and inspection, and to install them at the same time, which is inconvenient, complicated, and inefficient.

In order to solve this problem, a gas-insulated switchgear has been provided in which the pole section 3 is arranged horizontally and the switch 13 can be inserted into and removed from the side of the tank 1 in the horizontal direction. Unexamined Japanese Patent Publication 1987-
No. 196815). However, even if it is pulled out laterally, sufficient space is required on the side of the tank 1 to allow the pole part 3 to be pulled out. Therefore, multiple tanks 1
When installing the tanks 1 adjacent to each other, the spacing between the tanks 1 must be set larger than in the case described above (FIGS. 1 to 3), which requires a larger installation area. For this reason, it is not preferable in fields such as power equipment, where it is common to downsize electrical equipment for the purpose of reducing installation space.

(Objective of the Invention) In view of the above circumstances, the present invention has an object to enable simple, quick and easy maintenance and inspection of the switch 13 in the pole column part 3, and to reduce the installation space. was invented as.

(Summary of the Invention) With this object in mind, the present invention fixes the upper end of the pole column part 3 airtightly to a through hole bored in the upper plate of the tank, and the upper end of the pole column part 3 A lid body that airtightly covers the tank is removably attached to the upper plate, and the switch in the pole column part can be pulled upward from the through hole, so that inspection work can be performed without venting the insulating gas in the tank, and This prevented the installation area from increasing.

(Example) An example of the present invention shown in FIGS. 4 to 6 will be described below. In the figure, the same reference numerals are used for the same components as in FIGS. 1 to 3, and redundant explanation thereof will be omitted.

3f is a terminal tube in place of the terminal 3e, and a mounting seat 6b to which the conductor 6 is connected is provided on the outer wall of the terminal tube 3f. A support plate 16 is diametrically suspended inside the terminal tube 3f, and both ends of the support plate 16 are removably fixed to the terminal tube 3f with bolts 17, 17. A fixed terminal 13a of the switch 13 is fixed through the center of the support plate 16.
A current collector contact 18 that contacts the fixed terminal 13a is housed in a contact case 18a fixed to the support plate 16. This terminal tube 3
Further, an insulating cylinder 3g is hermetically fitted to f, and the insulating cylinder 3g is tightly fitted and connected to the mounting flange 3h. The mounting flange 3h is airtightly connected to the periphery of a through hole 1d formed in the upper plate 1c with a seal 20a interposed therebetween. And this mounting flange 3
A lid body 19 covering the mounting flange 3h covers the opening of the mounting flange 3h with a seal 20b interposed therebetween. The lid body 19 is detachable from the mounting flange 3h. Furthermore, the current collector contact 14 that comes into contact with the movable terminal 13b of the switch 13 is housed in a contact case 21 mounted with both ends placed on the inner stage of the terminal tube 3c. It is supported by a support plate 16a provided at the bottom of 13. 2
2 is a conductor, and the conductor 22 is fixed to the contact case 21 and removably engaged with the current collecting contact 23. The current collector contact 23 is the terminal tube 3
A mounting seat 6c for connecting the conductor 6a is provided on the outer wall of the terminal tube 3c. Further, the movable terminal 13b and the insulating rod 15 are screwed together, and the insulating rod has a connecting portion 15a at its lower end, and a pin insertion hole 15b is bored in the connecting portion 15a. The connecting portion 15a is detachably connected to a part of the operating mechanism via a pin. On the other hand, as shown in FIG.
and a plug 12c that airtightly covers the through hole 12b is detachably attached.

Therefore, the operation of the present invention will be explained based on the above embodiment. First, when performing maintenance and inspection of the switch 13, the lid 19 is removed from the upper plate 1c side of the tank 1. Next, the bolts 17, 17 of the support plate 16 of the fixed terminal 13a are unscrewed from the terminal tube 3f. On the other hand, the stopper 12c of the operation box 12 is removed, and the pin inserted into the pin insertion hole 15b of the connecting portion 15a of the insulating rod 15 is removed. Then, the switch 13 and the insulating rod 15 are pulled upward from the upper plate 1c side of the tank 1 using a crane or the like. In this way, the switch 13 is pulled out from the pole column 3 and taken out of the tank 1, inspected as required, or replaced with a new one, and the insulating rod 15 is reinserted into the pole column 3 from the upper plate 1c side. Then, insert it into the pole column part 3 from the terminal tube 3f. When the switch 13 is housed in the pole section 3, both ends of the support plate 16 are fixed to the terminal cover 3f with bolts 17, 17, and the cover body 19 is attached to the mounting flange 3h. Next, the connecting portion 15a
and the operating mechanism are connected with pins, and the operating box 12 is attached. Then, the inside of the pole column part 3 is evacuated and insulating gas or dry air is appropriately filled in to improve the dielectric strength inside the pole column part 3.

(Effects of the Invention) According to the present invention described above, during maintenance and inspection of the switch 13 housed in the pole section 3, the switch 13 is opened and closed by opening and closing the lid body 19 on the upper plate 1c side of the tank 1. Since it is constructed so that it can be pulled upwards without obstacles and with good workability, the operation box 12
The removal work is simpler and more efficient than the method in which the Can perform inspection work.
In addition, the pole part 3 is the bottom plate 1a and top plate 1c of the tank 1.
Since it is fixed across the tank, it acts as a reinforcement and improves the rigidity of the overall structure of the tank 1.
The plate thickness of the tank 1 can be formed thin, and the manufacturing cost of the tank 1 can be reduced. Furthermore, switch 1
Since the work to pull out 3 is done at the top of tank 1, there is no need to take up space on the sides of tank 1.
There is no need to take up a large installation area for tank 1.
It is possible to sufficiently respond to downsizing of electric power equipment, and there are effects such as being able to perform maintenance and inspection work without draining the insulating gas in the tank 1.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a conventional example, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a partially enlarged sectional view of FIGS. 5 is a sectional view similar to FIG. 2 showing an example, FIG. 5 is a side view taken in the direction of arrow B in FIG. 4, and FIG. 6 is a partially enlarged longitudinal sectional view of FIG. 4 and FIG. 1...Tank, 1a...Bottom plate, 1c...Top plate,
3... Pole column portion, 12... Operation box, 13... Switch, 15... Operation rod, 19... Lid body.

Claims (1)

[Claims] 1 The operating rod 15 is installed inside the sealed tank 1.
The pole section 3 houses the switch 13 that is opened and closed by
is airtightly fixed to the bottom plate 1a, and the tank 1
And in a gas insulated switchgear in which an insulating gas is sealed in the pole column part 3, an insulating tube 3g is airtightly connected to the upper end of the pole column part 3, and the upper end of the insulating tube 3g is connected to the upper plate 1c. A lid body 1 that airtightly adheres to the inner peripheral edge of the drilled through hole 1d and seals the through hole 1d.
9 is detachably provided, and the switch 13 can be pulled upward by opening the lid 19.