Solution description

The scope of public resources is broad, mainly including hospitals, schools, large libraries, sports venues, government office buildings, public transportation hubs (subway stations, train stations, airports), and municipal facilities (sewage treatment plants, water plants) and other public service venues. The types of loads in these places are diverse, mainly including: large medical imaging equipment such as X-ray machines, CT machines, and MRI in hospitals; Multimedia teaching equipment, computer rooms, variable frequency air conditioners, elevators, water pumps, and LED lighting fixtures in schools and office buildings; Signal power supplies, UPS, ventilation systems, escalators, and lighting facilities in transportation hubs; Aeration fans, lift pumps, sludge dewatering equipment, and variable frequency control devices in municipal water treatment facilities. These devices extensively use power electronic technologies such as switching power supplies, variable frequency speed control, and rectifier inverters, all typical nonlinear loads that generate large amounts of harmonic currents during operation. Taking hospital CT machines as an example, harmonic distortion rates generally reach 35%~45%, and some equipment even reach 60%. Harmonic pollution not only causes overheating of distribution transformers and power cables and accelerated insulation aging, but also triggers malfunctions of relay protection devices and errors in energy metering, causing interference to precision medical equipment and laboratory instruments. Meanwhile, a large number of inductive loads (air conditioners, pumps, fans, etc.) generally have low power factors during operation, leading to reduced output of distribution transformers and increased line losses. The dual problems of harmonic pollution and insufficient reactive power seriously affect the safety and service support of public facility power supply. 

Recommended plan

In the low-voltage distribution system of public resource projects, an IVL-RCS static filtering compensation module is installed. This module consists of filter capacitors and filter reactors, 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 power compensation while effectively suppressing five or more harmonic pollutions; The RCS series filter compensation module, with a reactance of 14%, has a tuning frequency of 134Hz, effectively suppressing three or more harmonic pollutions. For public resource locations with extremely stringent power quality requirements such as hospitals and data centers, IVL-APF active filters can be further configured to work in conjunction with IVL-RCS static filtering and compensation modules to achieve dual treatment of reactive power compensation and harmonic removal. By integrating our company's production of high-voltage switchgear, low-voltage switchgear, box-type substations, cable branch boxes, switches, ring control cabinets, gas filling cabinets, environmental protection cabinets, prefabricated cabins, and other complete sets of power equipment, we can provide full-chain power quality solutions for public resource projects, from high-voltage incoming lines to low-voltage distribution, ensuring the safe, stable, and efficient operation of distribution systems. 

Solution benefits

Effectively improve the power factor of public resource distribution systems to above 0.95, avoiding power rate fines caused by substandard power factor; reduce line and transformer losses to improve power supply economics; filter harmonic currents to ensure the normal operation of key equipment such as hospital precision medical equipment, school laboratory instruments, data center servers, and transportation hub signaling systems, reducing equipment failure rates and extending service life; suppress harmonic amplification, eliminate system resonance hazards, and protect equipment such as reactive power compensation capacitors from damage; improve voltage fluctuations and three-phase imbalance issues, ensuring uninterrupted power supply for public services. The solution combines energy saving, consumption reduction, and reliable operation, providing high-quality power assurance for the public resource sector.