The leakage protection plug is to detect the "residual current" in the "ground" circuit. Its working principle is to insert the two power wires (fire wire and neutral wire) of the plug into a special "zero-sequence current transformer" center hole at the same time. When the electrical appliance normally uses electricity, the current flowing through the fire wire and the neutral wire is completely equal. Yes, the current goes in and out, and the secondary coil of the current transformer has no voltage output.
When there is "residual current" in the "ground circuit" (including the ground circuit), the current of the two power lines passing through the transformer is 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, this voltage signal is processed by the integrated circuit of the dedicated circuit board, and then the thyristor on the trigger board is switched from off to on, so that the trip coil connected in this circuit is energized, so that The main circuit trip device is disconnected to protect people who may come in contact with the power supply.
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