초록 ▼

An insulated electrical member adapted for high voltage use is made by (1) covering a conducting member having a porous layer disposed thereon with a non-linear stress grading composition comprising cycloaliphatic epoxy resin, non-linear silicon carbide and an effective amount of curing agent, (2) c

An insulated electrical member adapted for high voltage use is made by (1) covering a conducting member having a porous layer disposed thereon with a non-linear stress grading composition comprising cycloaliphatic epoxy resin, non-linear silicon carbide and an effective amount of curing agent, (2) curing the non-linear stress grading composition at up to about 130°C., (3) impregnating the porous layer with a reactive insulating resin composition containing polar components, such that the resin composition contacts the non-linear stress grading composition, and (4) heating the covered, impregnated electrical member to cure the insulating resin composition, where the non-linear stress grading composition after insulating resin cure is characterized as remaining adherent to the member.

대표청구항 ▼

A method of making an insulated electrical member for high voltage use, said member having in combination, at least an electrical insulation layer disposed about said member, and a non-linear stress grading composition layer covering at least a portion of the electrical insulation layer, said method

A method of making an insulated electrical member for high voltage use, said member having in combination, at least an electrical insulation layer disposed about said member, and a non-linear stress grading composition layer covering at least a portion of the electrical insulation layer, said method comprising the steps of: (1) disposing a porous layer about a conducting electrical member, (2) covering a portion of the porous layer with a non-linear stress grading composition comprising the admixture of: (a) cycloaliphatic epoxy resin, (b) a Lewis acid complex curing agent for the cycloaliphatic epoxy resin, and (c) non-linear silicon carbide powder, (4) heating the covered electrical member at up to about 130°C., to completely cure the non-linear stress grading composition, (5) impregnating the porous layer with a reactive, highly polar insulating resin composition containing acid anhydride, such that at least the portion of non-linear stress grading composition covering the porous layer is in intimate contact with the reactive, highly polar insulating resin composition, and (6) heating the covered, impregnated electrical member at a temperature and for a time effective to cure the reactive, highly polar insulting resin composition; where the non-linear stress grading composition after insulating resin cure is characterized as remaining adherent to the member, with no substantial degradation by the reactive, highly polar resin. An insulated electrical member adapted for high voltage use, said member comprising: (1) a conducting electrical member, (2) a porous layer covering the conducting member, said porous layer having impregnated therein a cured reactive insulating resin, and (3) a cured, adherent, non-linear stress grading composition covering a portion of the impregnated porous layer, said non-linear composition comprising the admixture of: (a) 100 parts by weight of cycloaliphatic epoxy resin, (b) about 2 parts to about 15 parts by weight of a Lewis acid complex curing agent for the cycloaliphatic epoxy resin, and (c) about 200 parts to about 800 parts by weight of non-linear silicon carbide powder.