Solution description

Transportation facilities are important infrastructure for urban operation and regional connectivity, covering a wide range of areas, mainly including: urban rail transit (subway, light rail stations, and traction substations), railway passenger stations and freight marshalling yards, civil aviation airports (terminals, runway navigation lighting systems, baggage handling systems), highway tunnels and service areas, port terminals, and large public transport hubs (bus terminals, integrated transport transfer centers), etc. These locations have extremely diverse load types and high power density, mainly including: DC traction power supply systems (silicon rectifier equipment), ventilation and air conditioning systems (variable frequency fans, chillers), escalators and vertical elevators, signal power systems, UPS uninterruptible power supplies, monitoring and communication equipment, and platform door systems; Navigation assistance lighting systems, baggage sorting and transmission systems (composed of tens of thousands of motors), boarding bridge drive units, variable frequency air conditioning systems, LED lighting, and navigation display systems in airports; Large quay cranes, gantry cranes, container handling equipment, and shore power systems in ports; Jet fans, lighting systems, and monitoring equipment in highway tunnels, etc. 

Electricity used in transportation facilities is characterized by concentrated loads, frequent start-stop cycles, and uninterrupted all-weather operation. Among them, a large number of nonlinear loads such as DC traction rectifiers, variable frequency speed control equipment, UPS, and switching power supplies generate abundant harmonic currents during operation. Taking rail transit as an example, during metro train operation, silicon rectification generates a large number of harmonics during AC-DC conversion, with a harmonic distortion rate of up to 27% before active filtering devices are put into operation; In airports, nonlinear loads such as inverter air conditioners and charging equipment can experience voltage distortion rates exceeding 30%. Harmonic currents not only cause additional heating in transformers and distribution lines and accelerate insulation aging, but may also cause capacitor overload burnouts and relay protection malfunctions, interfering with sensitive loads such as signal systems and communication equipment. Meanwhile, a large number of inductive loads (air conditioners, fans, pumps, elevators, etc.) consume a large amount of reactive current during operation, with generally low power factor, leading to reduced transformer output and increased line losses. Some transportation facilities also have three-phase imbalance issues, and overload on neutral wires can cause electrical fire hazards. The dual problems of harmonic pollution and insufficient reactive power seriously threaten the safety and operational reliability of power supply in transportation facilities. 

Recommended plan

In low-voltage distribution systems of transportation facilities, an IVL-RCS static filtering compensation module is installed. This assembly consists of a filter capacitor and a filter reactor, specifically designed for reactive power compensation and filtering in harmonic pollution distribution systems. Among them, the RCS series filter compensation module, with a reactance of 7%, has a tuning frequency of 189Hz, providing reliable reactive compensation while effectively suppressing harmonic pollution of 5 or more harmonics; The RCS series filter compensation module, with a reactance of 14%, has a tuning frequency of 134Hz, effectively suppressing harmonic pollution of 3 or more times, suitable for traffic environments with large amounts of energy-saving lamps, LED lamps, and other single-phase harmonic source loads. This module uses high-voltage low-voltage filter capacitors and H-class insulated, high-linearity, and strong overload filter reactors, with a modular structure for easy installation and maintenance. For transportation facilities with extremely stringent power quality requirements, such as airports and data center-level communication rooms, IVL-APF active filters can be further configured to work in coordination with IVL-RCS static filtering and compensation components to achieve dual reactive power compensation and harmonic filtering. Combined with our company's complete sets of power equipment such as high-voltage switchgear, low-voltage switchgear, box-type substations, cable branch boxes, switches, ring control cabinets, gas inflators, environmental protection cabinets, and prefabricated cabins, we can provide full-chain power quality solutions for transportation facilities from high-voltage incoming lines to low-voltage distribution, ensuring the safe, stable, and efficient operation of distribution systems. 

Solution benefits

Effectively manage harmonic pollution in the distribution system of transportation facilities, reducing current distortion rates within the allowable range of national standards; Increase power factor to above 0.95 to avoid power factor fines caused by substandard power factor; Reduce losses in lines and transformers, minimize energy waste, and improve power supply economics; Protect key facilities such as traction power supply equipment, signaling systems, communication equipment, navigation lighting, and baggage handling systems from harmonic interference, reduce equipment failure rates, extend service life, and lower maintenance costs; Suppress harmonic amplification, eliminate system resonance hazards, ensure the reliability and continuity of power supply for transportation facilities, and prevent operational interruptions or safety incidents caused by power quality issues. The solution combines both energy saving, consumption reduction, and reliable operation, providing high-quality power assurance for transportation facilities.