We know thatpin transformer, Usually called safety transformers, are mainly used to isolate electrical equipment from the grid. Usually, they are used in safety situations, but usepin transformerIs it safe? Not necessarily, you must pay attention to the following two points, otherwise there is still a risk of electric shock.
1) The human body cannot contact both ends of the secondary at the same time, otherwise there is a risk of electric shock.
Generally, one line of the AC power supply voltage is grounded, and the potential difference between the other line and the human ground is 220V, which will cause electric shock.pin transformerThe primary and secondary are separated by an insulating layer. It is the voltage generated by electromagnetic induction. The two wires of the secondary coil are not grounded, and there is no potential difference between the wires of any secondary coil and the ground. One wire will not cause an electric shock, but the wires touching both ends of the secondary coil will receive an electric shock at the same time.
2)pin transformerThe secondary of cannot be grounded.
If the secondary neutral wire is grounded, it means that the input neutral wire and the output neutral wire are connected through the ground again, the isolation effect is lost, and there is a safety hazard, so the secondary of the pin transformer cannot be grounded.
Therefore,"pin transformerThe idea that it must be safe is wrong. It is said that the safety of pin transformers is only relative to other transformers, and there is no absolute safety. When using a pin transformer, everyone must pay attention to the above two points and do not relax their vigilance.