Background
The Shenzhen GFHJ Building, as an office park, primarily supplies power to office equipment and testing equipment. Previously, the building used a capacitor-reactor solution to address power quality issues. During this period, they collaborated with several manufacturers to try APF (Automatic Power Feeder) solutions, but none of these solutions resolved the practical problems. Issues such as severe overheating of capacitors and reactors and cable burnouts persisted, seriously affecting electrical safety and normal operation. Ultimately, the building chose the solution provided by our company.
Power Quality Issues
Significant Harmonic Pollution
The current distortion rate is as high as 46.5%, far exceeding national standards. The current waveform deviates from a sine wave, adversely affecting electrical equipment and the power distribution system.
Three-Phase Imbalance
The three-phase imbalance rate reaches 12.7%, easily leading to increased transformer losses and exacerbated heat generation, affecting the stable operation of the power distribution system.
Excessive Neutral Current
The neutral current reaches 27.2A, increasing the line load. Simultaneously, capacitors and reactances overheat severely, potentially causing cable burnout and posing a significant safety hazard.
Power Factor Needs Optimization
The power factor is 0.90, failing to reach optimal energy efficiency levels and potentially leading to energy waste.
Solution
Our company has developed a customized terminal electrical comprehensive management and protection system for the building, combining our independently developed software simulation technology. This system addresses multiple power quality issues, including harmonics, three-phase imbalance, and zero-to-ground voltage, without requiring replacement of the original core power distribution architecture. Through precise management, it improves the power distribution system environment from the source, completely resolving the problems that previous solutions failed to overcome.
Benefit Analysis
Safety Assurance
After the treatment, the temperature of the capacitor connection wires is controlled below 40℃, eliminating the risk of severe overheating and cable burnout, significantly improving the operational safety of the power distribution system and electrical equipment.
Performance Standards Meet Standards
The current distortion rate is reduced to 7.8%, fully complying with national standards; the three-phase imbalance rate is reduced to 2.42%, the neutral current is reduced to 3.4A, and the current waveform approaches a sine wave, resulting in more stable operation of the power distribution system.
Energy Efficiency Improvement
The power factor is improved from 0.90 to 0.99, reducing energy loss and electricity costs. It also extends the service life of transformers, capacitors, and other power distribution equipment, reducing maintenance frequency and costs, and ensuring the continuous and smooth operation of office and testing activities in the building.