JP2946726B2 - Gas insulated switchgear - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas insulated switchgear configured to house each component in a tank.

B. Summary of the Invention The present invention relates to a gas insulated switchgear in which the upper part of a substantially cylindrical tank is closed with an upper lid and the lower part is closed with a bottom plate, and each component is accommodated in the tank to constitute a cable unit. By attaching the components to the bottom plate, forming holes on the side of the tank and closing them with spacers, and burying the through terminals in the spacers, it is possible to assemble each component before putting the tank on the bottom plate, It is the one with improved performance.

C. Prior Art First, the connection state of the gas insulated switchgear will be described with reference to FIG. Although the figure shows the connection per single line, each gas insulated switchgear is provided for three phases. Also,
There are two main buses, main buses 1a and 1b, one of which is a main line and the other is an auxiliary line used as an emergency in case of a power failure or the like.
In the figure, 2 is a circuit breaker, 3 is a current transformer, 4 is a cable head for connecting to a load, 5 is a lightning arrester, 7a to 7c are grounding devices, and 8a to 8d are disconnectors.

Next, a gas insulated switchgear by such connection will be described with reference to FIG.

As shown, on the base 11, a cutoff block 12a, a main bus block 12b, and a track side block 12c are formed. The blocking block 12a includes a frame 13 on the base 11, a blocking tank 14 on the frame 13, and the like, and the track side block 12c is
It consists of an upper cable support base 15 and a cable tank 16 and the like. The main bus block 12b is composed of pipelines 17a and 17b extending in a direction perpendicular to the line surface, and pipelines 18a and 18b connected to the pipelines 17a and 17b at a right angle and connected to the shutoff tank 14. .

In the pipes 17a and 17b, main buses 1a and 1b for three phases are disposed in a direction perpendicular to the plane of the paper, respectively. Disconnector 8a, 8
b is provided in conduits 17a, 17b, circuit breaker 2, current transformer 3, and grounding devices 7a, 7b are provided in circuit breaker tank 14, cable head 4 for connecting a load bus, lightning arrester 5, disconnection Vessels 8c, 8d,
The grounding device 7c is provided in the cable tank 16. 20 is a main circuit conductor, 23 is a main circuit conductor connected to the main buses 1a, 1b, 2
Reference numeral 1 denotes an arrester connecting conductor for connecting the arrester 5 and the cable head 4 for each phase.

As shown in FIG. 5, cable heads 4a to 4c for three phases
And the three-phase lightning arresters 5a to 5c are respectively arranged at the vertices of a triangle.

D. Problems to be Solved by the Invention However, since the cable head 4 and the lightning arrester 5 are attached to the bottom plate 10, the disconnector 8c is attached to the cable tank 16, and the grounding device 7c is attached to the top lid 9, so that each component The connection is affected by the manufacturing accuracy of the bottom plate 10, the cable tank 16, and the upper lid 9, and the connection cannot be adjusted unless these are assembled.

In addition, in such an arrangement, there is no application part for applying a voltage to check the DC withstand voltage of the cable outside the cable tank, and a voltage transformer (hereinafter, referred to as an overhead power reception or a power receiving point) which is relatively in demand in private substations. VT) cannot be responded quickly.

Therefore, an object of the present invention is to provide a gas insulated switchgear that solves the above problem.

E. Means for Solving the Problems The configuration of the present invention for achieving the object is to close the upper part of the substantially cylindrical tank with the upper lid and to close it with the lower bottom plate,
Attach a cable head, lightning arrester, grounding device, disconnector, etc. to the bottom plate, and form a hole on the side of the tank to connect to other external equipment, cover it with a spacer, and connect through terminals for connecting inside and outside of the tank. Is embedded in a spacer, and the main circuit conductor in the tank is detachably connected to the through terminal to form a cable unit.

F. Function After attaching the cable head, lightning arrester, main circuit conductor, disconnector, grounding device, etc. to the bottom plate, cover the bottom plate with the tank and connect the tank to the bottom plate.

Then, when attaching the spacer to which the through conductor is attached to the tank, the main circuit conductor in the tank and the through conductor are detachably connected.

 This completes the assembly of the cable unit.

G. Examples Hereinafter, the present invention will be described in detail based on examples shown in the drawings. In this embodiment, since a part of the conventional gas insulated switchgear is improved, the same parts as those of the prior art are denoted by the same reference numerals, and the description thereof will be omitted.

(A) Configuration of the Embodiment The configuration of the gas insulated switchgear according to the present invention will be described with reference to FIGS.

As shown in FIGS. 1 (a) and 1 (b), the lower ends of the three-phase cable head 4 are connected to the bottom plate 10, and the main circuit conductor 20, the grounding device 8c, the main circuit The conductor 23 is attached. Further, lightning arresters 5 for three phases are attached to the bottom plate 10, and a disconnector 8 d is provided above a support 25 fixed to the bottom plate 10 for each lightning arrester 5 via an insulator 26. The operating means 27 is attached to the bottom plate 10, and the operating means 27 and the disconnector 8d are connected via the connecting means. A spacer 29 is provided between the cable support base 15 and the bottom plate 10, and a load cable 4 a is connected below the cable head 4. The upper part of the column 25 is also connected to the main circuit conductor 20 via an insulator 26. As shown in FIG. 1 (b), a pair of support rods 30 are provided near the inner peripheral surface of the cable tank 16 with their lower ends connected to the bottom plate 10, and the upper ends of the support rods 30 are connected by a mounting frame 31. Is done. The disconnector 8c of each phase and the upper part of the main circuit conductor 20 are fixed to the mounting frame 31 via the insulator 26. In addition, a three-phase powder grounding device 7c is attached to the attachment frame 31 via a reinforcing member 32.

Spacers 33 and 34 for closing are provided on a flange portion formed on the side surface of the cable tank 16, and penetrating terminals 35 and 36 that penetrate the spacers 33 and 34 in an airtight manner are embedded. Then, connecting portions 37, 37 for connecting the main circuit conductors 23, 20 to the through terminals 35, 36 by sliding in the horizontal direction are provided.
As shown in FIG. 2, the connecting portion 37 is composed of a plurality of contacts 40 bundled by a spring 41 and attached to the through conductor 35.
It is covered with 42, and the tip of the main circuit conductor 23 is inserted between the contacts 40. An external connection portion 39 for electrically connecting the inside and outside of the tank is attached to the spacer.

(B) Operation of Embodiment Next, the operation of the gas insulated switchgear will be described.

The assembly of the cable unit 12c in the gas insulated switchgear is performed as follows. After the bottom plate 10 is mounted on the cable support base 15 via the spacer 29, the cable head 4, the main circuit conductor 20, and the support 2 are attached to the bottom plate 10.
5. Attach the lightning arrester 5 and attach the pair of support rods 30 to the bottom plate 10, and attach the upper parts of the pair of support rods
Connect with 31. The mounting frame 31 supports the upper part of the main circuit conductor 20 via an insulator 26 and mounts the disconnector 8c, and the auxiliary device 32 mounts the grounding device 7c. Lightning arrester 5
A disconnector 8d is mounted between the support and the support 25 via an insulator 26, and the disconnector 8d is connected to the operating means 27 mounted on the bottom plate 10 via a connecting means.

Thereafter, the cable tank 16 is put on the bottom plate 10 to couple the cable tank 16 to the bottom plate 10. As shown in FIG. 2, a spacer 33 is attached to the shut-off tank 14, and a through conductor 35 is embedded in the spacer 33. A contact 40 of a connection portion previously attached to the outer end of the through conductor 35 is provided.
The main circuit conductor 23 in the cable tank 16 is inserted therebetween, and the cutoff tank 14 and the cable tank 16 are connected. An external connection portion 39 is attached to the right side of the cable tank 16 in FIG. 1 (a) via a spacer 34, and this case is also performed in the same manner as described above.

Since the through terminal 36 is embedded in the spacer 34, the use of the through terminal 36 facilitates the application of the DC withstand voltage of the load cable 4a. Also, if a container with a bushing is attached to the spacer 34, it is possible to cope with overhead power reception.

H. Effects of the Invention As can be seen from the above description, the gas-insulated switchgear according to the present invention has the following effects.

(A) Since all the components in the tank are attached to the bottom plate, the components can be assembled before the tank is put on the bottom plate, so that the workability is good and the reliability of connection of the main circuit portion is improved.

(B) Since the tank is provided with a spacer and the charged portion is guided to the outside of the tank via a penetrating conductor embedded in the spacer, the penetrating terminal is used as an applying portion to apply a voltage for inspecting the DC withstand voltage of the load cable. Not only makes it easier
It can easily respond to overhead power reception, and can easily respond to the attachment of accessories such as VT.

[Brief description of the drawings]

1 and 2 relate to an embodiment of a gas insulated switchgear according to the present invention, wherein FIG. 1 (a) is a front sectional view of a cable unit, and FIG. 1 (b) is I in FIG. 1 (a). -I arrow view, second
Fig. 1 is a detailed view of part A of Fig. 1 (a), Fig. 3 is a connection diagram of a gas insulated switchgear, Figs. 4 to 5 relate to a conventional gas insulated switchgear, and Fig. 4 is a gas insulated switchgear. Configuration diagram of switchgear, fifth
The figure shows the layout inside the cable tank. 4 ... cable head, 5 ... lightning arrester, 10 ... bottom plate, 16
... cable tank, 20, 23 ... main circuit conductor, 7c ... grounding device, 8c, 8d ... disconnector, 9 ... top cover, 33, 34 ... spacer, 35, 36 ... through conductor.

Claims (1)

(57) [Claims] An upper portion of a substantially cylindrical tank is closed with an upper lid and a lower portion of the tank is closed with a bottom plate.
While attaching a grounding device, disconnector, etc., a hole is formed on the side of the tank to connect to other external equipment and closed with a spacer, and a penetrating terminal for connecting the inside and outside of the tank is embedded in the spacer. A gas-insulated switchgear, characterized in that a cable unit is configured by detachably connecting a main circuit conductor in the inside to a through terminal.