Winding insulation system

A winding insulation system comprising:

• a set of insulated conductors;
• and
• a main wall insulation provided around the set of insulated conductors, the main wall insulation surrounded by a plurality of additional layers of the winding insulation system,
• wherein the main wall insulation includes at least:
• an inner section including polyimide mica paper reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the inner section being provided in one or more half-lap layers,
• an intermediate section including mica paper reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the intermediate section being provided in one or more half-lap layers, and
• an outer section including mica tape backed with aramid and reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the outer section being provided in one or more half-lap layers,
• wherein of the constituent sections of the main wall insulation, the inner section has the highest temperature rating, and the outer section is the most porous.

A winding insulation system comprising:

• a set of insulated conductors;
• a main wall insulation provided around the set of insulated conductors;
• a corona shield tape provided around the main wall insulation;
• a stress grading tape provided around the corona shield tape;
• and
• a sealing tape provided around the stress grading tape,
• wherein the main wall insulation includes at least:
• an inner section including polyimide mica paper reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the inner section being provided in one or more half-lap layers,
• an intermediate section including mica paper reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the intermediate section being provided in one or more half-lap layers, and
• an outer section including mica tape backed with aramid and reinforced with any combination of the group consisting of:
• glass cloth, polyester film, and polyester mat, the outer section being provided in one or more half-lap layers,
• wherein the stress grading tape is a voltage variable resistivity tape including woven polyester fabric tape with selvage, impregnated with an electrically semi conductive varnish, and wherein the sealing tape is polyester fabric tape impregnated with a thermosetting epoxy resin.