Passive component for detecting an electrical overload in electrically rotating machines

A passive component for detecting electrical overload in an insulation system of a rotating electric machine, the component comprising:

• a substrate;
• and
• a first conductor track and a second conductor track truths disposed on the substrate;
• wherein the first conductor track is coupled to the first phase of the electric machine, and the second conductor track is coupled to the second phase of the electric machine;
• wherein the substrate provides an electrically insulating bridge between the first phase and the second phase of the electric machine so an electrical potential defined across the electrically insulating bridge is the same as in an insulation system of the electric machine and a potential load on the passive component corresponds to a potential load on the insulation system;
• wherein a middle region of the substrate exposes the substrate between the first conductor track and the second conductor track;
• wherein the first conductor track and the second conductor track comprise a composite material with a dye configured to change color when exposed to electrical energy;
• wherein respective free ends of the first conductor track and the second conductor track create partial discharges in the middle region according to an electrical potential applied.