I. Analysis of Harmonic Sources and Characteristics Harmonics in AC systems are primarily generated by their core component—Variable Frequency Drives (VFDs/VSDs)—used to drive compressors, chilled water pumps, cooling tower fans, etc. Main Harmonic Sources: Central AC Units: Large centrifugal or screw compressor drive VFDs are the highest power and primary harmonic sources. Pumps ...
The market's preference for the model of "sampling on the high-voltage side and mitigation on the low-voltage side" is not accidental. It is the optimal solution determined by a combination of factors including technical feasibility, economic efficiency, safety, and mitigation effectiveness. The logic behind this can be understood with a simple analogy: A doctor performs a "blood te...
EMC (Electromagnetic Compatibility) testing for an Active Harmonic Filter AHF is critical and non-negotiable. An AHF(APF) is a power electronics device (like a high-frequency inverter) that injects canceling currents into a noisy electrical system. If poorly designed, it can become a significant source of electromagnetic interference (EMI) itself, disrupting other equipment. Conversely, it mu...
Have you ever been troubled by these frustrating issues? Production lines in your factory halting without warning, causing massive financial losses? Lights in your office building flickering inexplicably, servers restarting frequently, putting data at risk? Receiving shockingly high electricity bills every month, with unexplained "penalty" charges? Electrical equipment overheating, lifespan shorte...
Take a look around your modern office: the efficient LED lights, the humming server racks, the computers on every desk, the projectors in meeting rooms... They are all symbols of your business's efficient operation. But what you might not know is that these modern devices are also invisible "sources of pollution," quietly increasing your operational costs and even threatening your business securit...
Introduction: When "Refueling" Becomes "Charging," Power Quality Becomes the New Safety Battleground The recent spontaneous combustion of an vehicle in Shanghai during charging, with the official preliminary explanation citing "the use of substandard power by the owner," has sent shockwaves through the community. This incident not only caused panic among owners but also revealed a long-overlooked ...
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