RU2313874C2 - Cable termination - Google Patents

Abstract

FIELD: constructions of termination of superconducting cable.

SUBSTANCE: the termination of a superconducting cable consists of a current conductor and an insulator enveloping the current conductor. The superconducting cable includes a core with a superconducting conductor, and an insulating layer enveloping the conductor, the core is placed for longitudinal motion in a cryostat. The termination current conductor is electric-coupled to the superconducting core or to a standard conductor connected to the superconducting core through a tubular component of current-conducting material. The superconducting core or the standard conductor can perform of slide motion in the direction of the superconducting cable in the component.

EFFECT: provided motion of the superconductor cable core or of the standard conductor connected to its end.

2 cl, 3 dwg

Description

The invention relates to the termination of a superconducting cable according to the preamble of claim 1.

Superconducting cables should have devices at their ends that transfer current and voltage from the low temperature of the cable to the ambient temperature.

In this case, problems arise when the core of the superconducting cable located inside the cryostat with the possibility of free movement in the longitudinal direction, during cooling to a temperature at which the superconducting material goes into the superconducting state, is compressed or when the cable is heated to ambient temperature and the conductor expands .

The termination of a superconducting cable is known from EP 1283576 A1, in which the end of the core of the superconducting cable is enclosed in an electrically conductive sleeve, which is rigidly connected to the core through the end of the termination through a pipe section.

The basis of the invention is the task of finding such a solution that, while maintaining electrical contact, allows the core to move in a superconducting cable or a normal conductor connected to the end of the superconducting cable.

This problem is solved due to the features contained in the characterizing part of paragraph 1 of the claims.

Other preferred embodiments of the invention are disclosed in the dependent claims.

A significant advantage of the invention should be seen in that it allows you to abandon costly solutions to solve the problem and refer to the product available on the market, namely, to the tubular part. Another advantage is that the tubular part, by means of its spring plates, constantly ensures that contact is maintained even during radial expansion or contraction.

The invention is explained in more detail on the basis of schematically presented in figure 1-3 examples of execution.

Figure 1 shows a side section of a structure for connecting a superconducting cable 1 with an end termination 2. The superconducting cable 1, as is known, consists of a cable core and a cryostat located around the core.

The core of the cable consists of a core and a dielectric surrounding the core. Such a superconducting cable is known from WO 02/15203.

The termination 2 consists of an electric current conductor 2a surrounding the electric current conductor 2a of the insulator 2b, as well as a field control element 2c. The inner cavity 2d of the insulator 2b is preferably filled with insulating oil.

Reference numeral 3 denotes a casing surrounding the end of the cable and the junction between the core 5 of cable 1 and the electric current conductor 2a in which there is a vacuum. On the casing 3 sits a pipe 4, which concentrically surrounds the conductor 2A of electric current. The pipe 4 is made with two shells, and the cavity between the two shells 4A and 4b is filled with reinforced insulation and evacuated. The cavity between the electric current conductor 2a and the inner shell 4a is filled with an insulating material, preferably a foam material.

A particularly preferred embodiment of the connection between the core cable 1 and the electric current conductor 2a is described below.

The end 5a of a superconducting core freed from an unspecified insulating layer, consisting of a central element, for example, a densified cable of copper wires, and several tapes of superconducting material wound around the central element, is connected, for example, by soldering to a pin or pipe 6 made of copper. The ends of the individual strips of superconducting material are connected, with the possibility of conducting electric current, with the surface of the pipe 6 or pin.

A conductive tubular part 7 is connected to the lower end of the electric current conductor 2a, in the opening of which a pin or pipe 6 can move by sliding in the longitudinal direction. The tubular part 7 contains a plurality of plates radially springing inward or outward.

Figure 2 shows a section through the zone of the tubular part 7, while the tubular part 7 is presented in section only partially. Inside the tubular part 7 there is a pipe 6 or a pin connected to the core 5 of the cable 1. The tubular part 7 is electrically conductively connected to the adapter sleeve 8, which, in turn, is electrically conductive to the electric current conductor 2a. The tubular part 7 may have plates protruding both inwardly 7a and plates protruding outwardly 7b, which radially inwardly (plates 7a) are elastically supported on the pipe 6 or pin and radially outwardly (plates 7b) are elastically supported in the opening of the adapter sleeve 8. Plate 7a and 7b provide constant contact between the pipe 6 or the pin and the adapter sleeve 8, and even while moving the pipe 6 or the pin in the longitudinal direction relative to the cable 1. The plates 7a and 7b also undergo radial expansion or contraction when the cable is It is inoperative and, accordingly, in the working position, that is, when the cable cooling is turned off or on. The tubular part 7 is preferably made of copper and has a thin layer of silver on the surface.

Figure 3 presents a side section in the area of the tubular part.

The tubular part 7 is fixed in the adapter sleeve 8. In this embodiment, the pipe component 7 has only plates protruding inwardly 7a, which provide electrical contact between the pin or pipe 6 and the pipe component 7 and, therefore, a conductive connection with the adapter sleeve 8 and the electric current conductor 2a, also during the heating or cooling phase of cable 1, when the pipe 6 or the pin slides in the tubular part 7.

Claims (2)

1. The termination (2) of the superconducting cable (1), consisting of an electric current conductor (2a) and an insulator (2b) surrounding the electric conductor (2a), the superconducting cable (1) including a core with a superconducting core (5) and surrounding the core (5) is an insulating layer, and the core is positioned for longitudinal movement in a cryostat, characterized in that the conductor (2a) of the electric current of the termination (2) is electrically connected to the superconducting core (5) from a conductive material (7) from a conductive material or with s common to the superconducting core (5), the normal conductor (6), while the tubular part (7) on its inner and / or on its outer side has many radially springing plates (7a, 7b), while protruding inwardly of the plate (7a) are supported on the surface of the superconducting core (5), respectively, of a tube (6) or a pin of conductive material, the superconducting core (5) or a normal conductor (6) made by sliding movement in the direction of the superconducting cable (1) in the part (7). 2. The termination according to claim 1, characterized in that the normal conductor is presented in the form of a pipe (6) or a pin, which, with the possibility of conducting electric current, is installed on the end of the superconducting core (5), while the pipe (6) or pin is located in tubular part (7) with the possibility of sliding in the longitudinal direction of the cable (1).

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