Rail Transit Electrical Equipment Serves

Description

Rail transit electrical equipment serves as the power core of high-speed rail, light rail, and subway vehicles, primarily consisting of traction converters, on-board transformers, filter inductors, and current transformers. Amorphous and nanocrystalline cores are the key foundational materials for achieving lightweight and energy-efficient upgrades in this equipment, and have now become essential components for the electrification upgrades of rail transit systems worldwide.

The entire unit is manufactured using a modular, segmented production process, which consists of six major stages: component selection, core pretreatment, coil winding, vacuum epoxy casting, PCB integration, and whole-unit vibration aging. Specifically, the amorphous and nanocrystalline cores undergo four distinct processes—rapid quenching, precision temperature-controlled annealing, insulation coating, and precision winding—to eliminate internal material stresses and mitigate magnetic performance degradation caused by train vibrations. The coils utilize H-class high-temperature-resistant insulation materials combined with a vacuum impregnation process to enhance insulation stability in humid environments and tunnel condensation conditions.

In terms of performance, electrical devices equipped with these new soft magnetic cores achieve conversion efficiencies exceeding 95%. Compared to traditional silicon steel solutions, no-load losses are reduced by 70%–80%, and operating noise is lowered by 10–12 decibels. They can deliver stable power output across a wide temperature range of -45°C to 120°C. Nanocrystalline materials are well-suited for high-frequency power conversion in rail vehicles, with high-frequency eddy current losses amounting to only one-third of those in ferrite materials. This enables a 30% reduction in equipment weight within the limited space of train cars, optimizing the vehicle’s overall load capacity and energy efficiency.

The product line is primarily divided into three categories: onboard traction power supply, station power distribution, and signal sensing. It is widely used in power conversion for high-speed trains, auxiliary power supply for subways, rail signal acquisition, and emergency power distribution in tunnels. Key features include vibration resistance, temperature tolerance, and resistance to power grid surges, enabling long-term operation under complex conditions such as vehicle start-stop impacts, tunnel dust, and extreme outdoor temperatures.

Strict adherence to operational guidelines is required: regularly clean dust from the surfaces of core modules to prevent short circuits caused by metal debris; avoid prolonged operation at full load; during maintenance, avoid strong impacts to the core, as amorphous materials are highly brittle and impacts can easily cause magnetic circuit fractures; store idle spare parts in a dry, temperature-controlled warehouse to prevent moisture-induced degradation of magnetic properties.

From a materials perspective, amorphous materials are primarily used in power-frequency traction transformers, while nanocrystalline materials are focused on high-frequency filter inductors and precision current transformers. Both materials address the energy consumption bottlenecks of traditional electrical equipment from a magnetic materials standpoint, representing a core breakthrough for cost reduction and efficiency improvement in rail transit.

Many countries worldwide are accelerating the construction of new intercity railways and urban rapid transit lines, as well as the electrification of existing lines. The annual growth rate for rail transit equipment in Europe, the United States, and Southeast Asia remains around 18%. With the implementation of global low-carbon policies, lightweight, low-energy-consumption equipment is gradually replacing outdated silicon steel products, and the penetration rate of amorphous and nanocrystalline materials is rising year by year, indicating ample medium- to long-term growth potential for the industry.