Abstract:
Der Hüllkörper (1) dient dem Umhüllen des Endes, einer Abzweigung oder einer Verbindungsstelle eines Hochspannungskabels. Er weist ein Element (3) mit einer nichtlinearen Strom-Spannungs-Kennlinie auf, welches dem Steuern des elektrischen Feldes im Hüllbereich dient. Das Feldsteuerungselement (3) enthält ein Polymer und einen in das Polymer eingebetteten und Mikrovaristoren enthaltenden Füllstoff sowie mindestens einen längs einer Achse (2) erstreckten und flächenhaft ausgeführten Hohlkörperabschnitt mit einer durch Verformen des Hüllkörpers (1) an eine Aussenfläche des Kabels führbaren axialsymmetrischen Innenfläche. Um eine gute Feldsteuerung auch bei Kabeln zu gewährleisten, die mit hohen Spannungen betrieben werden, ist die Innenfläche des Hohlkörperabschnitts abweichend von der Aussenfläche des Kabels ausgebildet und zwar derart, dass durch Verändern der Anzahl der Mikrovaristoren pro Flächeneinheit infolge Dehnung und/oder Schrumpfung des Hohlkörperabschnitts nach dem Verformen die Feldsteuerung im Hüllbereich erreicht ist.
Abstract:
The invention relates to a sleeve (1) which surrounds the end, a branch, or a joint of a high-voltage cable. Said sleeve comprises an element (3) with a non-linear ampere-volt characteristic, which controls the electric field in the vicinity of the sleeve. The field control element (3) comprises a polymer and a filler that is embedded in said polymer and contains microvaristors, in addition to a flat hollow-bodied section that extends along one axis (2), with an axially symmetrical internal surface that can be guided onto an external surface of the cable by deforming the sleeve (1). The aim of the invention is to guarantee excellent field control, even for cables operating at high voltages. To achieve this, the internal surface of the hollow-bodied section is configured differently from the external surface of the cable, in such a way that the field control in the vicinity of the sleeve is achieved by modifying the number of microvaristors per unit of surface area by means of the extension and/or shrinkage of the hollow-bodied section after deformation.
Abstract:
The invention relates to a sleeve (1) which surrounds the end, a branch, or a joint of a high-voltage cable. Said sleeve comprises an element (3) with a non-linear ampere-volt characteristic, which controls the electric field in the vicinity of the sleeve. The field control element (3) comprises a polymer and a filler that is embedded in said polymer and contains microvaristors, in addition to a flat hollow-bodied section that extends along one axis (2), with an axially symmetrical internal surface that can be guided onto an external surface of the cable by deforming the sleeve (1). The aim of the invention is to guarantee excellent field control, even for cables operating at high voltages. To achieve this, the internal surface of the hollow-bodied section is configured differently from the external surface of the cable, in such a way that the field control in the vicinity of the sleeve is achieved by modifying the number of microvaristors per unit of surface area by means of the extension and/or shrinkage of the hollow-bodied section after deformation.