Do you really understand the working principle of GFCI leakage protection plug?
The "leakage protection plug" is also called the "residual current protection plug." When electrical equipment leaks, in the electrical circuit, a part of the current will inevitably not flow back to the transformer from the live wire via the neutral wire, but flow into the earth via the ground wire or the human body and other "conductors", forming a "tributary" outside the main circuit, that is What we usually call "leakage".
When this part of the current flows into the earth through the human body, it will cause an electric shock. The function of the "leakage protection plug" is to automatically cut off the power supply before the leakage current reaches the amount of current that hurts the human body when the electrical appliance connected to the plug has a leakage to protect personal safety.
The leakage protection plug is to detect the "residual current" in the "ground wire" loop. Its working principle is to pass the two power cords (live wire and neutral wire) of the plug into the center hole of a special "zero-sequence current transformer" at the same time. When the electrical appliances are using electricity normally, the current flowing in the live wire and the neutral wire is exactly the same. Yes, once the current enters and the other exits, the secondary coil of the current transformer has no voltage output. When there is "residual current" in the "ground loop" (including the earth loop), the two power lines penetrating into the transformer are unbalanced, and a voltage signal proportional to the current will be generated at the output of the "current transformer" , As long as the voltage signal is large enough, after the voltage signal is amplified by the integrated circuit of the dedicated circuit board, the thyristor on the trigger board is changed from cut-off to on, so that the trip coil connected in series in the loop is energized, so that The main circuit tripping device is disconnected to protect the personal safety of persons who may come into contact with the power supply.
Leakage protection plugs are widely used in electric heating tables, storage water heaters, hair dryers, electric clips, electric scissors, vacuum cleaners, electric bathtubs, electric water heaters, rice cookers, televisions, refrigerators, microwave ovens, washing machines, dishwashers, Leakage protection for terminal electrical appliances such as disinfection cabinets, water dispensers, computers, electric tools, medical equipment, and instruments. The leakage protection plug is compact, convenient, wide voltage (100-240V), and can be used in different countries and different places of use (different voltage and leakage action current). Corresponding plugs, wires, etc. can be used according to customer needs. The material is excellent (more Durable) and other features.
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