关于额定电压和频率

任何一种电器都会有额定电压的要求，实际运行过程中在正常波动范围内运行，电器会正常工作，否则会导致故障的发生。我国采用的供电频率为50Hz，频率偏差范围一般规定为±0.5Hz。又如热辐射光源，若电压偏高，其使用寿命将大大缩短；若电压偏低，则光源照度将明显变暗，严重影响工作效率和人的视力健康。可见电网电压波动将影响电气设备的正常工作和使用寿命。因此，电压、频率和供电连续可靠，是表征电能质量的基本指标。

电力系统中的所有电气设备都有额定工作电压和频率。电气设备在其额定电压和频率下工作时，其综合经济效果好。例如感应电动机，若电压偏高，虽然转矩增大，但电流也增大，温度增高，将使电动机绝缘严重受损，缩短使用寿命。

Regarding rated voltage and frequency
Any type of electrical appliance has a requirement for rated voltage. In actual operation, if it operates within the normal fluctuation range, the appliance will work normally, otherwise it will lead to the occurrence of faults. The power supply frequency used in our country is 50Hz, and the frequency deviation range is generally specified as ± 0.5Hz. For example, a thermal radiation light source, if the voltage is too high, its service life will be greatly shortened; If the voltage is low, the illumination of the light source will significantly decrease, seriously affecting work efficiency and human visual health. It can be seen that voltage fluctuations in the power grid will affect the normal operation and service life of electrical equipment. Therefore, voltage, frequency, and continuous reliability of power supply are basic indicators to characterize power quality.
All electrical equipment in the power system has a rated operating voltage and frequency. When electrical equipment operates at its rated voltage and frequency, its overall economic efficiency is the best. For example, in an induction motor, if the voltage is too high, although the torque increases, the current also increases and the temperature increases, which will seriously damage the insulation of the motor and shorten its service life.