HzShort for Hertz, which stands for the number of times an electric current periodically changes direction in one second,50Hzexpression1The second current is50Every cycle, the direction changes100Time. Then why is the AC frequency set to50HZThe following is andThree-phase asynchronous motor manufacturersLet's find out.

       On the whole50Hzand60HzIf the frequency is0HzThe problem of DC power transmission is the same as the electric spark that occurs when the electrical plug is pulled, when the current is large to a certain extent, the electric spark cannot be extinguished, we call it "arc".

       Ac in the case of the same transmission power, increase the voltage, the transmission current will be reduced, and the energy consumption on the line will also be reduced. For alternating current, the current will change direction, so there is a moment when the current crosses zero, using this small current time point, we can cut off the line current through the arc extinguishing device.

       If the frequency is high, the flicker of the lamp will be less, and the core volume of the transformer and generator will be reduced; If the frequency is low, the specific reactance effect of the AC circuit will be weakened, for the bipolar induction motor, if the frequency is60HzThe motor speed is close3600turn/Points.

       The reason why the frequency can not be too low: the transformer can be efficient, and the motor can be small and powerful. The reason why the frequency cannot be too high: the line and equipment can lose little, and the generator speed need not be too high. So according to experience and habit, our electrical energy is fixed at50Hzor60Hz.

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