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Why is there a series inductance in front of the zero line and the front of the thermostat? _Inductance coil_Electromagnetic coil

Why is there a series inductance in front of the neutral line and the front of the thermostat?

First, the effect of the inductor in the circuit:
1. The obstruction effect of inductance on communication power
When the communication power passes through the inductor coil, since the current time is changed, the self-induced electromotive force will occur in the coil, and the self-inductance electromotive force always obstructs the change of the original current, so the inductor coil will have a blocking effect on the alternating current. The size of the electromotive force is related to the self-inductance coefficient of the coil and the speed of the current change. The higher the self-inductance coefficient, the higher the frequency of the alternating current, the larger the self-inductance electromotive force, and the greater the obstruction effect on the communication power. The physical quantity of the inductance that hinders the communication is called the inductive reactance.
2, the effect of the inductor coil in the circuit
(1) through DC, resistance communication, this is for two different types of current, because the constant current does not change, can not cause self-inductance, so there is no obstruction effect on constant current, communication current time change There must be self-inductance electromotive force to hinder the change of current, so it has a hindrance effect on communication.
(2) Passing the low frequency and blocking the high frequency, which is for the alternating current of different frequencies. Because the higher the frequency of the alternating current, the faster the current changes, the greater the inductive reactance, and the greater the obstruction of the current. .
In summary, the zero line in front of the thermostat and the front of each inductor are connected in series, especially when used on a high-frequency machine, which acts to restrain the inrush current during startup, and also blocks the high-frequency current that occurs during equipment operation. In the power supply lines such as signals and signals, the power supply lines and other devices in the circuit are disturbed, which affects the normal operation of the power supply lines and other equipment. The inductance here cannot be saved!

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