CRE Film Capacitors in Modern Rail Transportation

In modern rail transportation, the performance and reliability of electronic components are pivotal to ensuring the efficiency and safety of train systems. Among these components, capacitors play a vital role in managing power, supporting traction systems, and enabling signaling equipment.

How Capacitors Support Rail Systems

Rail systems operate under demanding conditions, requiring components that can handle high power, high frequencies, and harsh environments. Capacitors excel in these scenarios, offering exceptional energy storage, discharge capabilities, and stability, making them indispensable for modern trains such as high-speed TGVs.

Key Applications of Capacitors in Rail Transportation

1. Power Management Systems

Capacitors are crucial in ensuring stable and efficient power distribution throughout the train.

• Partograph Systems: These systems monitor and distribute power across carriages, ensuring each receives the correct amount of energy. Low-inductance capacitors minimize interference and maintain system stability.

• Inter-Car Power Connections: Reliable power transfer between carriages is essential for seamless operation. Capacitors reduce power loss and ensure consistent energy flow.

• Converters and Voltage Stabilizers (CVS): Capacitors in CVS units provide necessary energy storage and voltage stabilization, supporting on-board electrical systems.

2. Traction Systems

Traction motors and drives are at the heart of a train’s movement. Capacitors support these systems by delivering high power and ensuring consistent performance.

• Traction Motors: Screw terminal aluminum electrolytic capacitors are commonly used to enhance the reliability and efficiency of traction systems, even under challenging conditions.

• Drives: Capacitors ensure smooth operation and reduce system downtime.

Types of Capacitors in Rail Applications

DC-Link Capacitors

DC-Link capacitors are designed to operate with low inductance, minimizing interference and maintaining stability in high-frequency environments. These are critical for power management systems, ensuring reliable performance in applications like partograph systems and inter-car connections.

Custom Power PP Film Capacitors

Polypropylene (PP) film capacitors are highly valued for their high energy density, low dissipation factor, and stability across wide temperature ranges. They are commonly used in converters, voltage stabilizers, and other power management units to ensure reliable and efficient operations.

Why Capacitors Are Indispensable

The unique properties of capacitors—such as their ability to store and release energy efficiently, maintain stability under varying environmental conditions, and support high-power applications—make them indispensable in modern rail systems. Capacitors contribute to:

• Enhanced System Efficiency: By ensuring stable power distribution and minimizing energy loss.

• Improved Reliability: With robust designs tailored for high-demand environments.

• Safety and Performance: Supporting critical functions like traction and signaling systems.

Capacitors may be small components, but their impact on rail transportation is monumental. By enabling efficient power management and reliable system performance, CRE Film capacitors play a crucial role in advancing rail technology and ensuring the smooth operation of trains worldwide.

CRE Solution
DC-link C1	Snubber C2
DKMJ-S	SMJ-P	RMJ-PC
Voltage
450~4500 (VDC)	630~6000 (VDC)	630~6000 （VDC）
Capacitance
100~10000 (UF)	0.15~4.7 (UF)	0.5~20 (UF)
Standard: IEC-61071 IEC-60068