Set of high-voltage cables and method for producing a set of high-voltage cables
A high-voltage device for receiving a high-voltage cable having a conductor designed to conduct an electrical current and a cable insulation surrounding the conductor, includes an insulation and a waveguide. The insulation includes an at least partly transparent or translucent field control unit from a siloxane polymer which is designed to at least partly surround the cable insulation of the high-voltage cable, the siloxane polymer including, in at least one portion of the field control unit, covalently bonded fluorophores and/or dielectric pigments. The waveguide is arranged such that a light signal caused by a partial discharge in the field control unit can be coupled from the field control unit into the waveguide.
1. A high-voltage cable accessory for the accommodation of a high-voltage cable with a conductor set up for the conduction of electrical current and a cable insulation surrounding the conductor, comprising:
an insulation comprising a field control part, which is transparent or translucent at least in some regions and which comprises a siloxane polymer, wherein the field-control part is set up to surround the cable insulation of the high-voltage cable at least partly, and wherein the siloxane polymer contains fluorophores at least in one partial zone of the field-control part, wherein the fluorophores are coupled covalently to the siloxane polymer and/or to dielectric pigments embedded in the siloxane polymer; and
a waveguide forming a part of the insulation is arranged such that a light signal caused by a partial discharge in the field-control part can be coupled from the field-control part into the waveguide.
2. The high-voltage cable accessory according to claim 1 , wherein the waveguide is disposed at least partly in the field control part and/or at least partly on a surface of the field-control part.
3. The high-voltage cable accessory according to claim 1 , wherein the waveguide is covalently modified with fluorophores in the core and/or cladding.
4. The high-voltage cable accessory according to claim 1 , wherein the waveguide comprises the siloxane polymer or a further siloxane polymer.
5. The high-voltage cable accessory according to claim 1 , wherein the field-control part has a conductive deflector, which can be contacted with a cable shielding of the high-voltage cable,
and/or wherein the deflector comprises the siloxane polymer or a further siloxane polymer.
6. The high-voltage cable accessory according to claim 1 , wherein the siloxane polymer contains various fluorophores and/or wherein the fluorophores of the field-control part are selected such that they are able to convert a fraction of the light signal into radiation in a wavelength region in which the siloxane polymer has a higher transparency than in the wavelength region of the fraction of the light signal, and/or wherein the fluorophores of the field-control part can be excited in a wavelength region below 500 nm, and/or wherein the fluorophores of the field-control part are selected and disposed such that pairs of different fluorophores in the field-control part are able to act as FRET pairs.
7. The high-voltage cable accessory according to claim 1 , wherein a reflectivity of the dielectric pigments is greater than 0.8.
8. The high-voltage cable accessory according to claim 1 , wherein a proportion by mass of the fluorophores is higher than 5 ppmw, and/or a concentration of the dielectric pigments is higher than 1% by vol.
9. The high-voltage cable accessory according to claim 1 , wherein the high-voltage cable accessory is a cable junction box or a cable termination.
10. A high-voltage device comprising a high-voltage cable accessory according to claim 1 and an optical detector, which is coupled with the waveguide.
11. The high-voltage device according to claim 10 , further comprising, coupled with the optical detector, a control and evaluation unit, and/or a light source, which is connected to the control and evaluation unit and is disposed inside a housing of the high-voltage cable accessory.
12. A method for the production of a high-voltage cable accessory for the accommodation of a high-voltage cable with a conductor set up for the conduction of electrical current and a cable insulation surrounding the conductor, comprising:
formation of a field-control part, which is transparent or translucent at least in some regions and which comprises a siloxane polymer;
arrangement of the field-control part in a housing of the high-voltage cable accessory, so that the field-control part is able to surround the cable insulation of the high-voltage cable at least partly; and
arrangement of a waveguide in the housing in such a way that the siloxane polymer contains, at least in one partial zone of the field-control part, fluorophores that are covalently coupled to the siloxane polymer and/or to dielectric particles embedded in the siloxane polymer, and/or dielectric pigments, and such that a light signal caused by a partial discharge in the field-control part can be coupled from the field-control part into the waveguide.
13. The method according to claim 12 , wherein the formation of the field-control part comprises the mixing of a siloxane system with the fluorophores and/or dielectric pigments for formation of a mixture, the introduction of the mixture and/or of a portion of the waveguide into a mold and/or the polymerization of the mixture in the mold.
14. The method according to claim 12 , comprising the arrangement of the waveguide and/or of the dielectric pigments on a surface of the field-control part.
15. Use of a siloxane polymer containing fluorophores and/or dielectric pigments as insulation of a high-voltage device, wherein the fluorophores are covalently coupled to the siloxane polymer and/or to dielectric particles embedded in the siloxane polymer.
16. Use according to claim 15 , wherein the insulation contains a field control part.