The significance of using the protection device Zero Sequence Current Transformer

The Zero Sequence Current Transformer is generally used to detect "unbalanced" currents (leakage currents) on the main circuit loop through the transformer, because on the main loop through the transformer, the current should be from The power source comes out, passes through a line in the transformer to the electrical equipment (load), and then returns from the load through other lines passing through the transformer and then returns to the power source. The magnitude of this current should be " "Equal amount" means the same size, just in a different direction.

If the current on one of the main circuit lines passes through the "primary side" of the transformer after coming out of the power supply terminal, it does not pass through other circuits on the primary side of the transformer or does not return to the primary side of the transformer. to the power supply end, but back to the power supply end through other "paths", then the secondary side (transformer coil) of the transformer will induce the current signal of the "passing and not returning" transformer (such as the human body). Electric shock or equipment leakage), and after this signal is amplified, it can control the action of the protection equipment that is electrically connected to the Zero Sequence Current Transformer, disconnect the power supply of the protected main circuit, and ensure the safety of people and equipment.