Low frequency hazard of the power grid - Solutions - Huaqiang Electronic Network

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For standard grid frequency operations, fluctuations above or below the nominal frequency should not exceed ±0.2 Hz. According to regulations issued by China's Ministry of Power Industry, when the frequency drops below 49.5 Hz, it should not last longer than 60 minutes. If the frequency falls below 49.0 Hz, the duration should not exceed 30 minutes. These limits are essential because frequency variations can impact both the power system’s internal stability and the performance of household appliances. A drop in frequency to 48 Hz can reduce motor speeds by approximately 4%, which may lead to reduced output in industrial production and affect product quality. Maintaining a stable frequency is crucial for ensuring reliable operation of electrical systems and preventing disruptions in daily life and industry. Therefore, it is vital to maintain the power system at its rated frequency to avoid potential damage to equipment, ensure consistent performance, and support the smooth functioning of the entire electrical network.