JPS6059909A - Sealed switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a sealed switchgear such as a gas insulated switchgear.

[Background of the invention]

Figure 1 shows the skeleton of a typical substation.

The other end of the breaker 4, which has one end connected to the main bus bar 1, is connected to a cable head 9 via a disconnector 7. At both ends of the breaker 4 and on the cable head 9 side of the breaker 7,
A grounding switch 3,5°8 is connected to each. A potential transformer 6 is connected between the breaker 4 and the breaker 7.

An example of a conventional gas insulated switchgear constructed according to this skeleton is shown in FIG.

The circuit breaker 4 is arranged vertically, and both terminals are led out from the negative side. The upper terminal is a disconnector 7 configured within the conductor tube 10.
and further connected to the cable head 9.

An earthing switch 5 and a voltage transformer 6 are connected between the upper terminal and the disconnector 7, and an earthing switch 8 is connected between the disconnector 7 and the cable head 9. On the other hand, the lower terminal of the breaker 4 is connected to the main bus 1 via the disconnector 2, and the earthing switch 3 is connected between the breaker 4 and the disconnector 2.

As can be seen from the figure, the upper conductor pipe 10 has a length that exceeds the lower disconnector 2 and the main bus 1 and is connected to the cable head 9, and the cable is connected to the opposite side of the main bus 1 from the breaker. hanging down. For this reason, the conductor tube 10 is not long, and the area it occupies as a whole becomes large. Also, the instrument transformer 6
is connected to the upper part of the conductor pipe 10, so the overall height is determined by this voltage transformer 6.

[Purpose of the invention]

An object of the present invention is to provide a sealed opening/closing device in which the axial length of a sealed container housing a circuit breaker is shortened.

[Summary of the invention]

In order to achieve the above object, the present invention forms a pair of branch parts led out in the radial direction at one end of a breaker, connects an instrument transformer to one of the branch parts, and connects a cable head container to the other branch part. A grounding switch is constructed by forming a part where the three phases are on one plane in a part of the central conductor arranged to connect both branch parts.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

Each of the component devices is sealed with an insulating medium such as SFg gas in a sealed container, and the device conductor constituting the main circuit is supported by a suitable insulator within the sealed container.

The sealed container 30 of the vertical breaker 4 has a branch part 31 formed at the lower part for leading out one terminal of the breaker 4, and two branch parts at the upper part for leading out the other terminal of the breaker 4. 32.33 are formed. Ryobunkyo part 32.3
3 are preferably formed on the same horizontal line so as to face each other, but they may be opposed to each other with some deviation in the circumferential direction of the sealed container 30.

Further, it may be slightly shifted in the vertical direction. Same, branching part 31
It is desirable to form it above. In any case, a pair of branch parts 3 formed in the radial direction near the upper end of the sealed container 30
2.33 is sufficient.

The three-phase, twisted-type main bus 1 is connected to the lower branch portion 31 via an insulating spacer 34 . A disconnector 2 is built in the sealed container of the main bus 1.

The circuit breakers 4 in the sealed container 30 are arranged for three phases, and one end is connected to the disconnector 2. The other terminal is in a sealed container 30
A central conductor 35u provided in the axial direction.

35V and 35W, and surrounding these center conductors 35, current transformer coils 36u, 36v, and 36W are fixed. At the upper end of the center conductor 35 is a substantially horizontal center conductor 3.
7u, 3'7', and 37W are fixed and form a substantially T-shape with the rain center conductor 35 and 37. center conductor 3
711.37V and 37W have a portion in which all three phases are arranged on the same horizontal plane at least in part between the openings 32 and 33. The insulating spacers 38 and 39, which provide gaseous separation between the breaker 4, the potential transformer 6, and the disconnector 7, are arranged so that their embedded center conductors are at each vertex of the triangle, and the uppermost vertex The center conductor 37V connected to the conductor 40 has a bend near the insulating spacer 38, 39 and is deviated from the above-mentioned horizontal plane. Further explanation will be given with reference to FIG. 4, which shows a perspective view of the space.

Center conductor 35u, 35V35w connected to breaker 4
are arranged at each vertex of a substantially equilateral triangle within the sealed container 30. Center conductors 37u, 37 orthogonal to the center conductor 35
v and 37w are arranged parallel to the same horizontal plane at equal intervals. This horizontal plane is defined as a plane passing approximately through the center line of the embedded center conductor 410.41W of the insulating spacer 3B. Therefore, since the levels of the buried conductor 41v and the center conductor 37v do not match, the center conductor 37v is changed in level by forming a bent part in the middle. Each center conductor is connected at an appropriate location by a contact 42. The embedded conductor of the insulating spacer 3B has a triangular shape, but it is normally placed at each vertex of an inverted triangle.5 If the conventional method is adopted, insulation between the current transformer coil 36v and the center conductor 37v shown in Fig. 3 will be a problem. As a result, the axial length, that is, the height, of the sealed container 30 increases. However, this embodiment does not have this drawback.

Although the center conductor 37v has a bent portion so as to change its level so that it is on the same horizontal plane as the other center conductors 3711.37W, it is also possible to make it straight between the embedded conductors of the insulating spacers 38.39. However, this embodiment is superior to this method. The reason for this is found in relation to the configuration of the earthing switch 5. In other words, according to this embodiment, the high-voltage side stators 40u, 40v, and 40W of the earthing switch 5 can be arranged on the same horizontal plane, and the grounding side mover can also be arranged on the same horizontal plane. , sealed container 30
It is possible to suppress the axial length, that is, the overall height.

This earthing switch 5 will be further explained with reference to FIG. The center ring $37v is connected to other center conductors 37u, 37 by the bending part.
The level has been converted to a horizontal plane that is almost the same as W. Each center conductor 37 has a high voltage side stator 40u, 40V, 40
W is installed. In the illustrated embodiment, it can be noted that each high voltage side stator 40 is lower than the level of the embedded conductor 43v. This is because if the high voltage side stator is installed without level conversion of the center conductor 37v, the stator will be located above the embedded conductor 41v, and the axial length of the sealed container 30 will increase.

A ground side movable element 43u corresponding to the high voltage side stator 40.

43V and 43W are attached to a common plate 44 and connected to a lever 46 via a link 45.

The rotating shaft 46a of the lever 46 hermetically passes through the sealed container 30 and is rotated by an operating device (not shown). Rotating axis 4
The rotation of 6a is a pendulum movement of Leno (-46), and finally the ground side mover 43 moves up and down, opening and closing between it and the stator 40.A guide rod 47 is attached to the common plate 44. The rod 47 is connected to the guide 48 in a slidable manner to form a guide device.

When forming the branch portions 32 and 33 in the sealed container 30, the branch portion also needs to have a shaft end that protrudes in the axial direction for manufacturing and strength reasons. The earthing switch 5 can be constructed without increasing the size of this shaft end. If we are considering configuring a grounding switch at the level of the embedded conductor 43v, we can provide a bent part in the center conductor 37v so that a part of the 6 conductors 37 in 3 phases exist on the same plane, and connect the grounding switch there. Let's understand the merits of configuring Vessel 5.

Although the sealed container 30 is vertical in the above embodiment, it may be horizontal. Furthermore, the insulating medium in the sealed container 30 is not limited to SFg gas, but may be insulating oil.

〔Effect of the invention〕

As explained above, the present invention forms a pair of branch parts in the radial direction at one end of a sealed container, connects the insulating spacers that seal both branch parts by three-phase center conductors, Since a portion of the conductor is arranged parallel to the end surface of the sealed container in a plane parallel to the end surface of the sealed container, and a grounding switch is provided in this portion, the axial length of the sealed container can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a skeleton of a general switchgear, Fig. 2 is a front view of a conventional gas-insulated switchgear corresponding to Fig. 1, and Fig. 3 is a partial cross section showing an embodiment of a sealed switchgear according to the present invention. 4 is an enlarged perspective view of the main part of FIG. 3, and FIG. 5 is an enlarged sectional view of the main part of FIG. 3. 4... Breaker, end... Earthing switch, 30... Sealed container, 31-33... Branch, j5. 37... Center conductor, 38. 39... Insulating spacer, 40...・High pressure side stator, Fig. 1, Fig. 6, Fig. 2, Fig. 3

Claims (1)

[Claims] A three-phase breaker is arranged in a sealed container having a substantially cylindrical shape, and a pair of branch parts protruding in the radial direction are formed at one end of the sealed container in the axial direction, and are connected to one terminal of the breaker. 1, which has a three-phase center conductor led out from both branch switches, and a grounding switch that grounds this center conductor.
The three-phase center conductor provided between the frontages has a portion where the three phases are arranged side by side on a surface that is substantially flat with the end surface of the one end of the sealed container, and a stator of approximately the same height is placed in this portion. A sealed switchgear, characterized in that a movable element is provided opposite to the stator and operates in the axial direction of the sealed container, and the earthing switch is constructed from the movable element and the stator.