Abstract:
The switch pole of a high-voltage switch contains an insulating housing (1) filled with insulating gas, two power supply connections (2, 3) that run through the wall of the insulating housing (1) and an electrically conductive contact assembly that is connected to the two power supply connections. The insulating housing (1) has a shell-type construction and has an inner and an outer shell. The outer shell is configured as an insulator (30), is cast onto the inner shell and supports the latter against a force that is caused by the pressure of the insulating gas. The inner shell is configured as a gas-tight sealable container (20) prior to the casting of the outer shell. Prior to said casting process, the housing (20) holds at least the contact assembly and at the same time has a degree of shape retention that is sufficient to support its own mass and all the parts held in said housing. The switch pole can be cost-effectively produced and is characterised by a high degree of operational safety.
Abstract:
Polymer concrete electrical insulation system comprising a hardened epoxy resin composition filled with an electrically non-conductive inorganic filler composition, wherein said polymer concrete electrical insulation system optionally may contain further additives, and wherein (a) the epoxy resin composition is based on a cycloaliphatic epoxy resin; (b) the inorganic filler composition is present within the range of about 76 % by weight to about 86 % by weight, calculated to the total weight of the polymer concrete electrical insulation system; (c) the inorganic filler composition comprises a uniform mixture of (i) an inorganic filler with an average grain size within the range of 1 micron (µm) to 100 micron (µm) [component c(i)], and (ii) an inorganic filler with an average grain size within the range of 0.1 mm (100 micron) to 2 mm [component c(ii)]; wherein (d) the inorganic filler with an average grain size within the range of 1 micron (µm) to 100 micron (µm) [component c(i)] is present in an amount within the range of 22 % to 42 %, calculated to the total weight of the polymer concrete electrical insulation system; and (e) the inorganic filler with an average grain size within the range of 0.1 mm to 2 mm [component c(ii)] is present within the range of 41 % to 61 % by weight, calculated to the total weight of the polymer concrete electrical insulation system; and method of producing said electrical insulation system.
Abstract:
An electric insulator, comprising: an electric insulation; and a semiconducting layer, forming on an outermost surface of the insulator that faces the surrounding environment, wherein said semiconducting layer comprises a polymer matrix; particles of a material that confers a semiconducting character to said layer, said particles being dispersed in said matrix. Said particles comprise nanostructures.