Electrical insulation systems and insulated components for electrical machine

A stator bar comprising:

• a plurality of conductors arranged in a group;
• and
• a groundwall insulation surrounding the group of the plurality of conductors, wherein the groundwall insulation comprises one or more layers of an electrically insulating mica tape, the electrically insulating mica tape comprising:
• (a) an electrically insulating mica paper;
• and
• (b) a fiber glass disposed on a first surface of the electrically insulating mica paper,
• wherein the electrically insulating mica paper is bound to the fiber glass via a cured form of a curable binder resin composition, wherein the curable binder resin composition comprises:
• 21 weight percent to 73 weight percent of a solid or semi-solid epoxy resin having an epoxide functionality of 2.5;
• 0.8 weight percent to 49 weight percent of a liquid epoxy resin having an epoxide functionality of 2;
• 4 weight percent to 15 weight percent of a bisphenol A-formaldehyde novolac;
• a metal acetylacetonate catalyst;
• and
• 2.5 weight percent to 15 weight percent of a toughener selected from the group consisting of polyethersulfone, methylmethacrylate butadiene styrene, and a combination thereof.

A stator bar comprising:

• a plurality of conductors arranged in a group;
• and
• a groundwall insulation surrounding the group of the plurality of conductors, wherein the groundwall insulation comprises one or more layers of an electrically insulating mica tape, the electrically insulating mica tape comprising:
• (a) an electrically insulating mica paper;
• and
• (b) a fiber glass disposed on a first surface of the electrically insulating mica paper;
• wherein the electrically insulating mica paper is bound to the fiber glass via a cured form of a curable binder resin composition, wherein the curable binder resin composition comprises:
• 53 weight percent to 61 weight percent of a solid or semi-solid epoxy resin having an epoxide functionality of 2.5;
• 23 weight percent to 26 weight percent of a liquid epoxy resin having an epoxide functionality of 2;
• 4 weight percent to 15 weight percent of a bisphenol A-formaldehyde novolac;
• a metal acetylacetonate catalyst;
• and
• 2.5 weight percent to 15 weight percent of a toughener selected from the group consisting of polyethersulfone, methylmethacrylate butadiene styrene, and a combination thereof.