Why can autotransformers be used as safety transformers? Isolation transformer is a variable ratio of 1 transformer, why has a security role?
For example, with autocouple input 220V, adjust the output voltage of 36V or 12V to do the use of safety transformers, when the input zero line disconnected, the output voltage to 220V on the ground, such as touch is quite dangerous.
Isolation transformer from the safety effect is mainly because the secondary side and the original side without electricity links, as the ratio is not 1, it should be based on the needs of electrical equipment.
The high and low voltage side of the autotransformer is realized by tapping in a coil, and there is no magnetic connection between the two times and there is an electrical connection, so it can not be used as a safety transformer.
Isolation transformer high and low voltage coil is separated, the only magnetic connection between the two there is no electrical contact, so the role of security protection.
The input and output of the autotransformer share a set of coils, the output is connected to the input grid, and the zero line of the grid is directly connected to the earth. When the operator is standing on the ground contact with the FireWire, if the voltage exceeds the safe voltage of 36V, there may be electric shock casualties occurred. With isolation transformer, the input and output each have a set of coils, and the output coil is not grounded. When the operator stands on the ground to touch the output of a line, because it can not form a loop, there will be no electric shock casualties. Therefore, the use of isolation transformers with safety protection.
