1

Rail transit

Overview：

Yuefeng Mica's core applications in rail transit vehicles and facilities cover traction motors, cables, braking systems, etc., analyzing its safety protection role in high-temperature and high-pressure environments.

I. Insulation Protection of Traction Motors and Drive Systems

The traction motor of rail transit vehicles is the core of the power system. During operation, it needs to withstand high frequency and high voltage (up to 3000V or more) and continuous high temperature (150-200℃). Yuefeng Mica Products play a key role here:

Motor Winding Insulation Mica tape is used to wrap the stator and rotor windings of the motor, forming a high-voltage insulation layer (breakdown voltage ≥18kV/mm), isolating the windings from the iron core to prevent short circuits; at the same time, it withstands the temperature rise during motor operation and avoids insulation aging.

Lead Wire Insulation Customized mica tubes are used to wrap the motor lead wires, combining flexibility and high temperature resistance, adapting to long-term use in the vibrating environment of the motor, and ensuring stable current transmission.

II. Fire and Fire Resistance of Vehicle Cables and Wiring Harnesses

Cables inside rail transit vehicles (such as power cables and control cables) must pass strict fire resistance tests (such as the EN 45545-2 railway fire safety standard). Yuefeng mica tape is the core material of the cable fire-resistant layer:

In the event of a fire, the mica tape can maintain structural stability at high temperatures of 800-1000℃, forming a ceramic barrier to prevent flames from attacking the conductors, ensuring that critical cables such as emergency lighting and communication remain open during the initial stage of a fire (more than 30 minutes), providing protection for evacuation and rescue.

For cables under the vehicle and on the roof that are easily affected by the environment, the Yuefeng mica composite layer can also resist rain, snow, and dust erosion, extending the service life of the cables.

III. Thermal Protection of Braking Systems and High-Voltage Equipment

The braking system of rail transit vehicles (such as disc brakes) generates instantaneous high temperatures (up to 600℃ or more) during emergency braking, and surrounding components require high-temperature protection; high-voltage switchgear, transformers, and other equipment also require insulation isolation. Yuefeng mica applications include:

Brake Component Heat Insulation Mica plates are installed as heat insulation gaskets between the brake and the vehicle body to block high-temperature conduction and protect surrounding plastic and rubber parts from heat damage.

High-Voltage Equipment Insulation Mica plates and mica gaskets are used for busbar support and terminal insulation in switchgear, withstanding the high-voltage electric field during equipment operation to prevent arc breakdown, suitable for DC 1500V/AC 25kV and other high-voltage systems.

IV. Auxiliary Protection of Car Interior Trim and Structural Components

In the interior of the carriage and the vehicle body structure, Yuefeng mica meets specific needs through customized forms:

Interior Flame Retardant Insulation Mica paper composite board is used for the base layer of carriage walls and floors, combining flame retardancy (meeting GB 8624-2012 B1 level standard) and insulation, reducing the risk of fire spread.

Structural Stability in Vibrating Environments Flexible mica products are used for insulation buffering at the connection points of the vehicle body, resisting continuous vibration during vehicle operation, and preventing insulation failure due to friction and loosening.