The air energy water heater hot water outlet anti-leakage thing is called leakage protection plug.
Leakage protection plug is also called residual current protection plug. When the electrical appliances leakage, in the electrical circuit, there is bound to be a part of the current is not from the firewire through the center line flow back to the transformer, but through the ground or the human body and other "conductive body" into the earth, constituting the main circuit outside of a "tributary" is what we usually call the "leakage". "Leakage".
Leakage protection plug is to detect the "ground" circuit of the "residual current". Its working principle is to plug the two power cord (firewire and wire) at the same time through a special "zero sequence current transformer" in the center of the hole, when the normal electrical appliances, the firewire and the middle line of the current flowing through the line is completely equal, the current in and out of the secondary coil of the current transformer no voltage output.
When there is a "residual current" in the "ground loop" (including the earth loop), the current in the two power lines going through the transformer is unbalanced, and the current transformer's output will generate a current proportional to the current. The output of the "current transformer" will produce a voltage signal proportional to the current, as long as the voltage signal is large enough, the voltage signal is amplified by the integrated circuit of the special circuit board and other processing.
The thyristor on the trigger board will change from cutoff to conduction, which will energize the tripping coil connected to the circuit, thus disconnecting the main circuit disconnecting device and protecting the personal safety of those who may be in contact with the power supply.
Scope of application
Leakage protection plug is widely used in electric ambient table, storage water heater, electric hairdryer, electric clip, electric clipper, vacuum cleaner, electric bathtub, electric water heater, electric rice cooker, television, refrigerator, microwave ovens, washing machines, dishwashers, disinfection cabinets, drinking fountains, computers, power tools, and medical equipment, instrumentation, and other terminal electrical appliances of leakage protection.