JPS6343964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to bends in gas insulated devices, such as gas insulated cables (or duct aerial cables).

For example, if the civil engineering base is separated into 1 and 2 at the rising part of the gas insulated cable 3 as shown in FIG. 1, uneven ground settlement may occur between the bases 1 and 2. At this time, the sheath of the gas insulated cable 3 (for example, a pipe made of aluminum, stainless steel, iron, etc.)
Excessive load is applied to it, and in extreme cases it may even break.

However, in conventional systems, no countermeasures have been taken against this problem, and the only thing that can be done is to raise or lower the fixed frames 4, 4', etc. in response to uneven settlement.
In Figure 1, 4 is a fixed frame, 4' is a terminal fixed frame,
5 is the terminal part. In other words, conventional systems are unable to absorb the displacement caused by uneven settlement and the resulting load (internal stress) on their own. For this reason, there was a risk that the cable sheath would be destroyed if left unattended, so there was a need for regular patrols and surveys.

The present invention solves these problems. That is, the present invention provides an inner conductor and an outer pipe,
The device is equipped with a protective cylindrical body such as a box, and the conductor and the protective cylindrical body are mainly insulated with gas.
In a device that is bent at least in an L-shape across frames attached to civil engineering bases that are separated from each other, the L-shaped bending portion of the device is cut, and while the above-mentioned A means is provided for absorbing the expansion and contraction of the device caused by the unequal displacement of the civil engineering base, and the above means absorbs the expansion and contraction of the device caused by the unequal displacement of the civil engineering base. The protective cylindrical body of the device that mainly expands and contracts in the above displacement direction is formed by forming two protective cylindrical expandable parts in series, and connecting the protective cylinder of the device to an intermediate cylindrical body with one end closed and the other end open. The shaped body is connected to the intermediate cylindrical body in a straight line on the open side of the intermediate cylindrical body, and the closed side of the intermediate cylindrical body is connected to the intermediate cylindrical body beyond the two protective cylindrical body expansion/contraction parts. On the open side, the protective cylindrical body of the device in the direction of expansion and contraction is directly or indirectly fixed to the protective cylindrical body of the device in the direction of displacement, and the protective cylindrical body of the device in the direction other than the direction of displacement that mainly expands and contracts is attached to the intermediate tube. The two protective cylindrical elastic parts of the shaped body are connected to the intermediate cylindrical body in a T-shape, and in the case of the conductor part, the conductor expands and contracts unequally through the conductor elastic parts. This is a bent part of a device insulated by gas, which is connected so as to expand and contract mainly in the direction of displacement due to displacement, and has gas present inside the intermediate cylindrical body.
The invention will now be explained in detail with reference to the exemplary drawings. However, it is not limited to this.

In the present invention, as shown in FIG. 1 described above, at the L-shaped bent portion (the rising portion in FIG. 1) of a gas insulated cable installed on a separated civil engineering base, As shown in Figure 2, a means or unit for absorbing the expansion and contraction of the gas insulated cable caused by the unequal displacement of the civil engineering bases separated from each other is installed at the lower bend 6 by cutting the cable.
The mechanism of the above unit is as follows. Note that arrows X in the figure indicate directions in which the cable mainly expands and contracts due to uneven settlement of the civil engineering bases 1 and 2. (That is, the direction in which the cable vertical section mainly expands and contracts and is displaced.) That is, the unit absorbs the displacement of the cable sheath 8, forms two sheath expansion and contraction sections 12 in series, and has an outer intermediate portion closed at one end. A cylindrical body 11,
It is provided with an internal conductor extensible part 16 that absorbs the displacement of the cable conductor 7, and the open end of the intermediate cylindrical body 11 is arranged at one end of the cut vertical direction of the cable sheath 8 so that these 11 and 8 are in a straight line. The other end of the cut cable sheath 8 in the horizontal direction is connected between the two sheath expansion/contraction parts 12 of the intermediate cylindrical body 11 so that these 8 and 11 form a T-shape,
The conductor expansion/contraction section 16 is connected between the cut ends of the cable conductor 7. Note that 15 in FIG. 2 is a flange that closes one end of the outer intermediate cylindrical body 11, and this is also used for attaching a connecting bolt 13, which will be described later. Further, 10 is a gas filled inside the outer intermediate cylindrical body 11.

The above-mentioned two sheath telescoping parts are, for example, aluminum bellows, stainless steel bellows, etc., and the closed side of the intermediate cylindrical body whose peripheral surface forms the two sheath telescoping parts is connected to the two sheath telescoping parts by a connecting body, for example, a bolt. The open side of the intermediate cylindrical body beyond 12 is directly or indirectly connected and fixed to the connected aluminum sheath 8.

In the case of directly connecting and fixing, for example, the flange 15 on the closed side of the intermediate cylindrical body and the flange 14 located on the open side of the intermediate cylindrical body are connected with bolts 13, and the flange 14 on the open side of the intermediate cylindrical body is connected to the flange 15 on the intermediate cylindrical body open side. This is done by welding to the aluminum sheath 8 to which the open side of the body is connected.

In the case of indirect connection and fixation, the flange located on the open side of the intermediate cylindrical body is welded to the open side of the intermediate cylindrical body, and the open side of the intermediate cylindrical body is welded to the aluminum sheath.

These bolts 13 usually consist of four or more bolts, and are used to prevent the sheath expandable portion from being fully extended due to the thrust caused by the gas pressure. The reason why two of the sheath expansion/contraction parts are provided is that one cannot cope with uneven subsidence at any time.

That is, if one sheath expandable part is provided without a bolt, the expandable part will be fully extended due to the thrust caused by the gas pressure, as shown in Figure 6a. It does not have an elastic function.

Furthermore, if one sheath telescopic section is provided with a bolt, as can be seen in Fig. 6b, the telescopic function is naturally lost since the telescopic section is fixed with a bolt against the thrust caused by the gas pressure. Also, even if two telescoping parts were attached in such a state with bolts, the telescoping function would be lost in the same way as described above.

On the other hand, in the case where two sheath expansion/contraction parts are provided as in the present application and there is a bolt as in the present application, as can be seen in Fig. 6c, the bolt counteracts the thrust caused by the gas pressure, and Expansion and contraction can be followed by expansion and contraction of the expansion and contraction part. That is, the upper elastic part can be expanded, and the lower elastic part can be contracted.

The conductor expansion/contraction section 16 is, for example, of a plug-in contact type as shown in FIG. 3 or of a thin-walled laminated plate type as shown in FIG.

In Fig. 3, 21 is a shield, 22 is a contact, 23 is a guide, and 24 is a tension spring (for example, a ring-shaped spring made of stainless steel). Tightening ensures contact pressure to the conductor 7, ie the cable conductor 7 is pulled inward and conductive by the contact 22 making contact. Further, the expansion and contraction of the conductor is absorbed by the cable conductor 7 and the contactor 22 sliding while being in contact with each other.

Also, in Fig. 4, 31 and 32 are conductors, and 33 and 3 are conductors.
4 is an aluminum plate, 35 is a laminate plate, 36, 37, 38
39 is a shield cover, 39 is a bearing, and the cable conductor is electrically connected by a laminate plate 35 that expands and contracts between both conductors. Further, expansion and contraction of the conductor is absorbed by the deformation of the laminated plate 35.

Furthermore, as shown in FIG. 2b, the horizontal displacement Y can also be absorbed by the angular displacement of the expandable portion.

Furthermore, this unit can also be applied to horizontal displacement Z in the case of horizontal arrangement. This is shown in FIG. Figure a in Figure 5 is a side view, Figure b is a plan view, and the same reference numerals as in Figures 1, 2, and 3 indicate the same parts.

In the present invention as described above, the sheath and conductor of the cable are provided with elastic parts to absorb displacement in response to uneven displacement such as uneven subsidence of the ground. Therefore, excessive internal stress is not generated in the cable. It does not cause any destruction.

Moreover, it can be installed on right angle bends such as vertical bends.
The present invention has excellent effects such as being able to absorb displacement in three axial directions and having a simple structure.

The present invention is a gas-insulated cable (pipeline aerial cable) that is equipped with an internal conductor and an outer cylindrical protector (sheath), such as an externally sealed switchgear, and the cylindrical protector and the conductor are mainly insulated by gas. Applicable to equipment that

[Brief explanation of drawings]

Figure 1 is a diagram illustrating the bending part of a gas insulated cable installed on a frame attached to a separate civil engineering base. The curved portions at the ends are shown as examples. FIG. 2 is a diagram showing the main parts of the present invention, and FIG. Figure b is a longitudinal cross-sectional view of the cable attached to the bent part of the figure, Figure b is a view taken along the A-A arrow in Figure a (however, when displaced in the Y direction), Figures 3 and 4 are in accordance with the present invention. Figure 3 is a plug-in contact type, Figure 4 is a thin-walled laminate type, and Figure 5 is a detailed view of the conductor expansion and contraction part when the present invention is applied to horizontal displacement in a horizontal arrangement, and Figure a is a side view. Figures 6 and 6b are plan views, and Figures 6a, b, and c are diagrams for explaining the effects of the present invention, respectively. 1, 2...Civil engineering base, 3...Gas insulated cable, 4...Fixed frame, 4'...Terminal fixed frame, 5
... Termination part, 6... Bend part, 7... Cable conductor, 8... Protective cylindrical body (e.g. cable sheath),
9...Cable spacer, 10...Gas, 11...
...Intermediate cylindrical body, 12...Protective cylindrical body elastic part (e.g. cable sheath elastic part), 13...Bolt, 1
4...Flange, 15...Flange that also serves as a sealing lid, 16...Conductor expansion and contraction part, 21...Shield,
22... Contact, 23... Guide, 24... Tension spring, 31, 32... Conductor, 33, 34... Aluminum plate, 35... Laminate plate, 36, 37, 38... Shield cover, 39... …bearing.

Claims (1)

[Scope of Claims] 1. A device that includes an inner conductor and an outer pipe, a protective cylindrical body such as a box, and insulates the conductor and the protective cylindrical body mainly with gas, and that the devices are separated from each other. In a device that is bent at least in an L-shape across frames attached to a civil engineering base, cut the L-shaped part of the device, and in the meantime cut the unevenness of the civil engineering base. Means for absorbing the expansion and contraction of the device caused by displacement is provided, and in the case of the protective cylindrical body portion of the device, the means is provided to absorb the expansion and contraction of the device caused by the unequal displacement of the civil engineering base. The protective cylindrical body of the device in the displacement direction is formed by forming two protective cylindrical expansion and contraction parts in series, and connecting the protective cylindrical body of the device to an intermediate cylindrical body with one end closed and the other end open. The open side of the intermediate cylindrical body is connected to the intermediate cylindrical body in a straight line, and the closed side of the intermediate cylindrical body is 2
The protective cylindrical body is directly or indirectly fixed to the protective cylindrical body of the device in the direction of expansion and contraction on the open side of the intermediate cylindrical body beyond the elastic part of the protective cylindrical body, and the other side is mainly expanded and contracted. The protective cylindrical body of the device in the direction other than the displacement direction is connected to the intermediate cylindrical body in a T-shape between the two protective cylindrical expandable parts of the intermediate cylindrical body, and is also connected to the conductor part. The conductors are connected through the conductor expansion/contraction part so that the conductor expansion/contraction is mainly in the direction of expansion/contraction due to unequal displacement, and a gas is present inside the intermediate cylindrical body. Bends in equipment that are insulated with gas. 2. The bent portion of a gas insulated device according to claim 1, wherein the gas insulated device is a gas insulated cable. 3. The bent portion of a gas insulated device according to claim 1, wherein the gas insulated device is a closed type switchgear.