WO2006084863A1

WO2006084863A1 - Method for laying a gas-isolated electric cable, and mass element for positioning a gas-isolated electric cable

Info

Publication number: WO2006084863A1
Application number: PCT/EP2006/050764
Authority: WO
Inventors: Hermann Koch
Original assignee: Siemens Aktiengesellschaft
Priority date: 2005-02-11
Filing date: 2006-02-08
Publication date: 2006-08-17
Also published as: EP1846998A1; DE102005007147A1

Abstract

The invention relates to a gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) which is to be laid in a body of water. Said gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) is provided with at least one mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) for sinking the same. The mass elements (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) are used as foundations and for mounting the gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) once the gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) has been sunk. The inventive gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) is movably fixed to the mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) such that a movement perpendicular to the direction of installation of the gas-isolated electric cable (1, 1a, 1b, 1c, 1d, 1e, 1f) is made possible.

Description

description

Method for laying a gas-insulated electrical line and mass element for positioning a gas-insulated electrical line

The invention relates to a method for laying a gas-insulated electrical line within a body of water and to a mass element for positioning a gas-insulated electrical line at the bottom of a body of water.

From the patent US 5, 530, 200, a method for He ^¬ direction of a gas-insulated electrical line is known. The local gas-insulated electrical line is example ^{¬ laid} within a tunnel or above ground. The laying takes place in such a way that along the Verlegewe ^¬ ges a mobile mounting device is moved and the gas-insulated electrical line is pieced together in sections.

Gas-insulated electrical cables are able to transmit very ho ^¬ hey services. Particularly in the case of offshore wind farms, locally concentrated power must be transported over greater distances. For such connections to gas insulated electrical Lei ^¬ are particularly obligations. So far, effective laying method for laying a gas-insulated electrical line within a body of water are not known.

The object of the invention is to provide a rational method which allows a rapid laying of a gas-insulated electrical line within a body of water. According to the invention this is achieved in a method for laying a gas-insulated electrical line within a body of water, that at least one Mas seelement is attached to the gas-insulated electrical line, and the gas-insulated electrical line is lowered with the mass element in the Gewäs water, the Mass element overcomes ^{¬ on the} drive of the electrical line.

As, 200 is known from the patent US 5, 530, gasiso ^¬ profiled electrical conduit is formed substantially of a solid body inside which the actual electrical conductors insulated ^¬ specific for transmitting electrical energy is maintained. The solid body is for example a metallic tube or a plastic tube. The solid body is gas-tight. On the inner wall of the solid body electrically insulating support elements are arranged, which hold the electrical conductor inside the solid body. The interior of the solid body is filled with an insulating gas. This insulating gas is for example an electronegative gas such as sulfur hexafluoride, nitrogen or a mixture with the ^¬ sen gases. To increase the electrical insulation resistance and thus to reduce the circumference of the solid body, the insulating gas is subjected to an increased pressure. Due to the large part of gaseous insulating ge ^¬ formed

Isolierstrecke has a gas-insulated electrical line to a liquid medium on a large buoyancy. The gas-insulated electrical cables act as floating bodies. Due to its structural design with a solid body and the ^arrange inside the solid body ^¬ th electrical conductor and the support by means of electrically insulating support elements is a gas-insulated electrical Always put together the line section by section. This ab ^¬ sectional composition can be done, for example, outside of the waters ses. For this purpose, special Verlegeplatt ^¬ forms or the like can be used. After the successful installation of the gas-insulated electrical line, this can be connected to at least one, preferably with a plurality of mass elements. The attachment of Mas seelemente can be done in different ways. Thus, the Mas seelemente can be flexibly connected to the mass elements, for example, using steel cables, or even stiffened angle stiff on the outer surface of the solid body. Through the Mas seelemente a drop in the gas-insulated electrical line can be effected.

An advantageous embodiment can provide that s the Mas ^¬ seelement serves as a foundation of the gas-insulated electrical line on the bottom of a body of water.

A flushing or. The underground laying of gas-insulated pipes in a body of water has the disadvantage that repair in the event of a fault is almost impossible. Therefore, a laying of a gas-insulated electrical line over the Gewäs sergrund is preferred, so that the outer body is accessible even after reaching the final laying position. One uses now necessary to lower the gas-insulated lines mass elements as a foundation, it is a simple and inexpensive installation method gege ^¬ ben. After the sinking of the gas - insulated electrical line on the bottom of the water, the mass elements can additionally be anchored to the bottom of the river, resp. be aligned to the desired location of the gas-insulated electrical line above the bottom of the water body. Advantageously, it can furthermore be provided that the laying along the laying direction of the gas-insulated electrical line is S-shaped at least in sections.

Due to the arched installation, it is possible to compensate for temperature-induced elongations of the gas-insulated electrical line. In particular, a section-wise S-shaped laying of the gas-insulated electrical line makes it possible to compensate for larger changes in length over comparatively short sections. As a result, it is possible to dispense with compensators in the line path. Thus a rapid To ^¬ reunification a plurality of sections in a long gas insulated electric wire possible as to form Sonderbau- resp. Special sections with compensation devices is not to be considered. To form the portion ^¬ example S-shaped laying of the gas insulated electric wire of the conditioned by the construction of the gas-insulated electric cable bending radius can be used. Thus, for example, elongated S-shaped sections can be configured. It can also be provided that the gas-insulated electrical line is laid with a plurality of S-shaped sections arranged one behind the other, so that a wave-like position of the gas-insulated electrical line is achieved.

Advantageously, it can furthermore be provided that a plurality of gas-insulated electrical lines are fastened to the mass element.

To increase the transmission capacity can be provided a plurality of gas insulated electric lines gen parallel to verle ^¬. In addition to the increase in transmission power you can Several gas-insulated electrical lines also vorse ^¬ hen to ensure redundancy in the event of failure of a gas-insulated e- lektrischen line. In addition, several single-phase encapsulated gas-insulated electrical lines for the transmission of a multi-phase AC voltage system can be used. If one uses now a mass ^¬ element for securing a plurality of gas-insulated electrical lines, the number of mass elements can be reduced. Furthermore, a space-saving arrangement of the several electrical lines can be generated approximately parallel to each other. As a result, the claimed space for laying in the water is reduced. Furthermore, control and monitoring work is simplified because the gas-insulated electric ^¬ cal lines are immediately adjacent to each other.

The gas-insulated electrical lines can be assembled at different production sites of individual segments and then be ^fastened to a common mass element be ^¬ . As a result, the number of necessary mass elements for lowering a plurality of gas-insulated electrical lines can be reduced.

When laying a gas-insulated electrical line in a body of water, for example, temperature-related changes in length are taken into account. In addition, the body of water can even forces acting on the gas ^¬ insulated electric line through the motions. Mechanical Verspan ^¬ calculations of gas insulated electrical wires have a negative effect on the life of a system.

Therefore, it is a further object of the invention to provide a mass ^¬ element for positioning a gas-insulated electrical line at the bottom of a body of water, which support for the reduction of mechanical stresses on the gas-insulated electrical line.

In a Mas seelement for positioning a gas-insulated electrical line at the bottom of a body of water, the object is achieved in that the mass element is movably connected to the gas-insulated electrical line.

By a movable connection between gas-insulated electrical line and ground element length changes are made possible over several along the line arranged mass elements away. As a result, mechanical stresses in the solid body or. reduced in the electrical conductor.

Furthermore, it may be advantageously provided that the gas-insulated electrical line is connected transversely to its laying direction so as to be movable with the mass element.

In addition to the heat-related changes in length of the gas-insulated electrical line can act by movements within the waters ses also forces on the gas-insulated electrical conductors, which are directed transversely to the laying direction. By a transversely movable attachment of the gas-insulated e- lektrischen line to the mass element, the effect of such lateral forces can be reduced. Furthermore, for example, in the case of an S-shaped laying of the gas-insulated electrical line, thermally induced changes in length of the gas-insulated electrical line can also be converted into a transverse movement.

To enable a transverse movement can be provided, for example, that the Mas seelement and the gas-insulated electrical line are connected to each other via flexible cable arrangements. In this case, the mass element is anchored to the body of water. The gas-insulated electrical line is provided due to their gas filling with a buoyancy. About the cable arrangement, the gas-insulated electrical Lei ^¬ tion is maintained at a defined distance from the mass element. Depending on the occurring forces now the gas insulated electric wire, in the water limited "trei ^¬ ben".

A further advantageous embodiment can provide that the ground element during installation as sinking and after installation acts as a foundation for the gas-insulated electrical line.

The use of mass elements as sinkers and their groove ^¬ Zung as a foundation, allows a continuous rapid deployment sequence.

A further advantageous embodiment can provide that the mass element has a slide rail for connection to the gas-insulated electrical line.

By means of slide rails, a defined movement of the gas-insulated line on the mass element is made possible. The slide ^rails can thereby enable a movement transversely to the laying direction or along the laying direction. Such a holder of the gas-insulated electrical line has the advantage over a mounting of the cable via cable arrangements that a movement in a more defined range is permitted. As a result, less flexible gas-insulated electrical lines can be used for installation within a body of water. The following are schematic embodiments of the invention ^¬ He shown in figures and described in more detail below,

It shows the

Figure 1 is a plan view of a laid on the bottom of a Gewäs ^¬ sers gas-insulated electrical line, the

Figure 2 is a front view of a mass element with a gas-insulated electrical line attached thereto, the

Figure 3 is a plan view of a gas-insulated electrical line and attached to this mass element, the

Figure 4 is a Mas seelement with several gas-insulated electrical lines attached thereto, the

Figure 5 is another Mas seelement with several be ^¬ fixed gas-insulated electrical lines, the

Figure 6 shows another embodiment of a mass body, the

Figure 7 is a slide rail in detail, the

8 shows a holder of a gas-insulated electrical line with a cable arrangement and the

Figure 9 shows a further embodiment of a cable arrangement. 1 shows a plan view of a gas insulated elekt ^¬ step line 1 which is laid on the bottom of a water body. Along its longitudinal orientation, the gas-insulated electrical line 1 arcuate, mutual Auslenkun ^¬ conditions, so that S-shaped sections arise. For holding the gas-insulated electrical line below the water level several Mas seelemente 2 a, 2 b, 2 c connected to the gas-insulated electrical line 1.

For installation of a gas insulated electric wire 1 in a body of water, for example on a mounting platform floating in the water and is slidable along the laying path ver ^¬, the gas insulated electric wire joined together from one individual segments. These segments each have ^¬ weils portions of a fixed body to which ren in its perception ^¬ receiving an electrical conductor. The electrical conductor is kept at a distance from the inner wall of the fixed body by means of electrically insulating means. The interior of the solid body is filled with an insulating gas. Several of these sections thus constructed are connected to one another at the end, so that the sections of the solid body are connected to one another in a gastight manner and the electrical conductors are electrically connected to one another. Subsequently, the solid body is filled with an electronegative gas, preferably under an elevated pressure. After the successful installation of the gas-insulated electrical line it is connected with Mas seelementen. This Mas soul elements are dimensioned such that upon lowering the gasisolier- th electric line in the water, the mass elements to the sink sergrund Gewäs and take the gas insulated electrical ^¬ specific line. This type of laying can, for example, as a continuous process from a laying platform respectively . It may be, however, also provided which is s, the gas-insulated electric line over their entire length Herge ^¬ and then at least one but is preferably lowered at a plurality of mass elements seroberflache under the Gewäs- with.

In the following figures, similar assemblies are provided with the same reference numerals.

2 shows an end view of a gasisolier ^¬ th electrical line 1, which is shown in section. Evident is a solid body 3 and the isolated inside the solid body 3 arranged electrical ^¬ cal conductor 4. The gas-insulated electrical line 1 is mounted on a Mas seelement 2a. The mass element 2a rests on the bottom 5 of a body of water. It may be arranged that the mass elements 2a exclusively due to its Mas ^¬ se the foundation on the bottom of the water 5 forms. Alter ^¬ natively can also be provided that the mas seelement 2a is additionally anchored in the bottom 5 of the water. For ^¬ equal to mechanical stresses and movements, the gas-insulated electrical line 1 in the direction of Doppelfei ^¬ les 6 is movably held on the mass elements 2a. To Errei ^¬ chen mobility is the Mas seelemente 2a with a plurality of slide rails 7a, 7b, 7c provided (see Figure 3). The slide ^rails 7a, 7b, 7c are, for example, cast in the mass element 2a made of cast concrete. On the sliding rails ^¬ nen 7a, 7b, 7c, the gas-insulated electrical line 1 is slidably mounted. As a result, a movement in the direction of the double arrow 6 is possible. This movement is transverse to the longitudinal direction of the gas-insulated electrical line 1. In addition, the gas-insulated electrical line 1 can be displaced in the direction of its laying axis. Both by the Displacement in the direction of the longitudinal axis as well as transversely to the laying axis in the direction of the double-file 6 is ^{beispielswei ¬} se compensated for a change in length due to temperature fluctuations on the gas-insulated electrical line 1.

FIG. 4 shows an embodiment of a mass element 2d which serves to receive a plurality of gas-insulated electrical lines 1a, 1b, 1c. The gas-insulated electrical lines Ia, Ib, Ic are laid parallel to one another and are fastened together to the mass element 2d. The attachment takes place such that around the outer shell ^¬ surface of the gas-insulated lines Ia, Ib, Ic each a strap is wrapped around, which is movably mounted in slide rails of Mas ^¬ seelementes 2d. Due to this loan movable storage, the gas-insulated electric wires Ia, Ib, Ic in the direction of double Feiles 6 are put along the direction transverse to its Ver ^¬ displaceable.

FIG. 5 shows a further possibility of fastening a plurality of gas-insulated lines 1 a, 1 b, 1 c to a common mass element 2 e. In the present case, however, are attached to the gas-insulated lines Ia, Ib, Ic truss 8 angle rigid, which are slidably mounted in slide rails of the mass element 2e.

The slide rails on the mass elements are in each case designed such that a floating of the gas-filled gas-insulated electrical lines 1, Ia, Ib, Ic is prevented.

Figure 6 shows another way of designing a Mas seelementes 2 f, this is a support frame 9 is assigned ^¬ , which has a slide rail. The sliding Rail is arranged such that in the direction of the buoyancy of the gas-insulated electrical line Id is arranged counteracting, so that the buoyant force is used to hold the gasiso ^¬ lated electrical line. By the slide a sliding of the gas-insulated electrical line Id is possible across their direction of installation. In a two-sided support of the support frame 9, a lateral breakage of the gas-insulated line Id is no longer possible. In addition, the support frame 9 in other forms of design, for example, arcuately executed.

In the figure 7, the embodiment of a slide rail 7 is shown. The slide rail 7 has corresponding undercuts, behind which a bolt with diametrically opposite expansions can be inserted. By this bolt is a Auftreiben or. a removal of a gas-insulated electrical line 1 from the slide rail 7verhindert.

Figures 8 and 9 show alternative mounting options. Here, the gas-insulated electric lines Ie, If are held "floating" in the Gewäs ser. ^¬ agent mass elements 2f, 2g and a cable assembly 10 is prevented from breaking and Auftreibe the gas-insulated electric line Ie.

The design variant shown in Figure 9 allows the gas-insulated electrical line If a more elastic moving in the water. A mass element 2h is connected via a cable arrangement 10b to the gas-insulated electrical line If. The cable assembly 10b prevents floating of the gas-insulated electrical line 10 f and defined the distance of the gas-insulated electrical line If to the mass element 2h.

In the embodiment variants shown in FIGS. 8 and 9, the gas-insulated electrical lines Ie, If are movable transversely and longitudinally relative to their laying directions and in the direction of the bottom 5 of the body of water.

Claims

claims

1. A method for laying a gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If) within a water sers, characterized in that on the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie , If) at least one mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) is attached, and the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If) with the Mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) is lowered into the water, the Mas seelement (2a, 2b, 2c, 2d, 2e, 2 f, 2g, 2h) the buoyancy of the electric Line overcomes.

2. The method according to claim 1, characterized in that the mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) as Funda ^¬ ment of the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, I f) on the bottom of a body of water (5).

3. The method according to any one of claims 1 or 2, d a d u r c h e c e n e c e s in that the laying along the laying direction of the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If) is at least partially S-shaped.

4. The method according to any one of claims 1 to 3, characterized in that a plurality of gas-insulated electrical lines (1, Ia, Ib, Ic, Id, Ie, I f) on the Mas seelement (2a, 2b, 2c, 2d, 2e, 2 f, 2g, 2h) are attached.

5. mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) for positioning ^¬ ren a gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, I f) on the bottom (5) a Gewäs sers, characterized in that the mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) is movably connected to the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If).

6. mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) according to claim 5, characterized in that the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If) transversely to is movably connected to the Mas soul ^¬ element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) their laying direction.

7. mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) according to claim ^¬ 5 or 6, characterized in that the mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) during installation as a sinker and after installation as a foundation for the gas-insulated electrical line (1, Ia, Ib, Ic, Id, Ie, If) acts.

8. mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) according to one of claims 5 to 7, characterized in that the mass element (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) to a

Connection to the gas-insulated electrical line (1, Ia,

Ib, Ic, Id, Ie, If) has a slide rail (7, 7a, 7b, 7c) up.