Rail transit insulation materials
Time: 06-22 2026 Auther: Xujue Electrical
The insulation system of high-speed trains mainly serves traction motors, traction converters, high-voltage power supply systems, onboard electrical systems, and cable systems.
Insulation Materials Used in Metro and High-Speed Rail Systems
| Material Category | Typical Materials | Key Characteristics | Typical Applications |
| Laminated Insulation Materials | FR-4, G10, G11, GPO-3 | High mechanical strength, high dielectric strength, arc resistance | Traction converters, switchgear, busbar supports |
| Flexible Composite Insulation Materials | DMD, NMN, NHN, AMA | Flexible, high thermal class | Traction motor windings, slot insulation |
| High-Temperature Insulation Materials | Mica tape, Polyimide (PI), Nomex aramid paper | High thermal resistance, corona resistance | High-voltage traction motor main insulation |
| Molded Insulation Materials | SMC, DMC | Moldable, good flame resistance | Switchgear enclosures, structural parts |
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