Multilayered high voltage grading system for electrical conductors

An insulated electrical member adapted for high voltage use having in combination, an electrical member, electrical insulation disposed about said member and a conducting varnish covering a portion of the insulation, wherein an abrasion resistant stress grading system covers at least part of the conducting varnish, the stress grading system comprising:

• (1) a first base layer of resinous paint comprising non-linear silicon carbide particles having a resistivity value of between 2,000 to 4,000 Meg. Ohm/Square, in contact with the conducting varnish, (2) a second overlapping layer of resinous paint comprising non-linear silicon carbide particles having a resistivity value of between 4,000 to 6,000 Meg. Ohm/Square and containing at least one fibrous support therein, covering at least a part of the first base layer and (3) an overcoat of an arc and track-resistant resinous insulating varnish;
• wherein, at the point of overlap of the silicon carbide layers, the thickness ratio of the base silicon carbide layer:overlapping silicon carbide layer is from 1:1 to 1:15.