For normal operating grid frequencies, the fluctuations above and below shall not exceed ±0.2 Hz. China's Ministry of Power Industry issued regulations stipulate that: the frequency of operation below 49.5Hz can not exceed 60min. The frequency of operation below 49.0 Hz cannot exceed 30 min. For normal operating grid frequencies, the fluctuations above and below shall not exceed ±0.2 Hz. Because it not only affects the internal operation of the power system, but also affects thousands of households to varying degrees. When the frequency drops to 48 Hz, the motor speed drops by about 4%, so that the output of many industrial products will drop and the quality cannot be guaranteed. Therefore, it is important to ensure that the power system operates stably at the rated frequency.
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