DE1665184A1 - High voltage line - Google Patents

Description

'"■ · ■ - ^: .-: - ■; .:. V / ALTHER

Γ. ' ₃ : CHFMüller GmbHo 1 β C c Ι Q /

Aki _SS PHD-1134 1b65184

Registration voast 12 _O January 1968

O.HoF Müller GmbH, 2 Hamburg 1, Alexanderstraße 1 "High voltage line"

The invention relates to a formstaMle high voltage cable · Such lines are, for example, to connect individual high voltage "ihrenden components required within a high-voltage device, the lines having to their position and shape maintained in order not to come with components in contact _9, the other high-voltage potential have" Furthermore, it is necessary that the high-voltage conductors have a sufficiently large diameter so that the electrical field strength that occurs when the device is in operation is smaller than the breakdown field strength of the insulating medium (usually

It is known to use metal pipes for this purpose · The Pipes, especially in devices for high DC voltages, have to be bandaged with cable paper, which is then impregnated will. This prevents breakdowns even if there is a Insulating oil for the formation of fiber bridges (these are lines of relatively high conductivity). To guide several wires lying on approximately the same high voltage potential and insulated from one another (e.g. for connecting the cathode of a X-ray tube) it is already known to bring this into a wire helix with a sufficiently large helix diameter, the wire helix again bandaged with cable paper and then impregnated. Because of bandaging with cable paper and the subsequent Both embodiments are relatively expensive to impregnate.

PHD- 1134 (EV- 2949) - 2 -

109843/0258

Starting from a high voltage line with at least one inner wire, which is enclosed by a conductive cylinder provided with an insulating material on the outside, which is in the Operation has at least approximately the same potential as the inner wire, the invention avoids this expense by an insulating tube with a conductive lacquer layer on its inside, which surrounds a foam core with at least one inner wire

The invention is explained in more detail using an exemplary embodiment shown in the drawing

The drawing shows a section of a high-voltage line 1 "according to the invention, it consists of a PVC pipe 2 provided on its inside with a Leitlaekschicht 3, which is filled with a foam core 4, in which an inner wire 5 is embedded _e

The inner wire 5 is conductively connected to the conductive lacquer layer 3. Since the conductance of the thin Leitlaekschicht is significantly smaller than that of the wire 5 _f , almost the entire current flows through the wire 5 ° The Leitlaekschicht serves to provide the conductive surface that is effective to the outside enlarge »so that the field strength that occurs is reduced«. The inside diameter of the PYG tube 2 must therefore be so large that the electric field strength occurring on the surface of the conductive layer 3 during operation is smaller than the breakdown field strength of the PVÖ tube and the insulating medium that surrounds the high-voltage line especially rigid polyurethane foam

Two or more inner wires isolated from one another can also be used are embedded in the foam core that is approximately have the same potential and one of them with the Leitlaekschicht is conductively connected · Such high-voltage lines are, for example, when connecting the cathode of an X-ray tube Feeding of the heating current required; the two lead

■ - 3 109843/0258

Lead wires against each other only have a relatively low voltage; however, this voltage is compared to earth or the anode very high"

If the inner wire is a high-resistance wire (so-called high-resistance cord) and if the inside of the PVC pipe is coated with a high-resistance conductive varnish ₉ , a damping resistance results which can be switched into the high-voltage circuit of an X-ray tube to limit the current that occurs in the event of a tube breakdown «

For the transmission of very high voltages outside of a high-voltage device, the high-voltage conductor 1 can be used as an inner wire that lies inside another PVC pipe, also filled with a foam core, which is metallized on its outside _{or the like}

To produce a high-voltage line according to the invention, liquid in a PVC pipe conductive silver is gschüttet, wherein the tube inside is wetted by pivoting the tube ^v evenly with the conductive silver · In this tube, the inner core 5, for example, centered by means of a in the center of the pierced stopper, after which the pipe is filled with rigid polyurethane foam, which hardened after a few minutes

Very often it is not possible to lead the high-voltage line straight through the high-voltage device, so that the PVC pipe only must be bent into the desired shape · It is known to fill the PVC pipe with sand for this purpose, so that there is enough Heating can be bent without changing its cross-section · When producing curved high-voltage lines According to the invention, the foam core can function Take over the sand filling · To do this, the PVC pipe after a curing time of 10 minutes, if the foam is still not completely hardened, but already firm enough to prevent a change in cross-section, heated and bent

- 4. 109843/0258

Other good insulating plastics that can be made soft (e.g. thermoplastics) can also be used as pipe material, such as polypropylene, polyethylene and those known under the trade names Polysulfon, Plexidur, Plexiglas and Makroion Plastics.

After its complete hardening, the foam core gives the high-voltage line 1 dimensional stability, which in particular at high temperatures cannot be achieved with some plastic pipes alone.

Patent claims:

- 5 1098A3 / 0258

Claims (6)

Claims 1.High-voltage line with at least one inner wire, which is enclosed by a conductive cylinder provided on the outside with an insulating material, which has at least approximately the same potential as the inner wire during operation, characterized by an insulating tube (2) with a conductive lacquer layer (3) on its inside, which has a foam core (4) surrounds, in which at least one inner wire> {5) is embedded _o 2. High-voltage line according to claim 1, characterized in that the insulating tube (2 ^ made of a thermoplastic material consists· 3. High voltage line according to claim 1 for use as Cathode connection line, characterized in that the insulating tube (2) encloses two inner wires isolated from one another. 4. High-voltage line according to claim 1, characterized in that that the inner wire (5) consists of resistance wire and that the conductive lacquer layer (3) has a high resistance. 5. The high-voltage line according to claim 1, characterized in that it serves _$ a high voltage cable as the inner core. 6. Method of manufacturing a curved high-voltage power line according to claim 1, characterized in that the inner wire is centered in the insulating tube metallized on its inside is, after which the Eohr is filled with a foam and heated before the final hardening of the foam and is bent. 109843/0258 (ρ Blank page