Isolation transformer refers to the input winding and output winding electrically isolated from each other in the transformer, is used for two or more coupled circuits for electrical isolation of the transformer. Its principle is the same as ordinary dry-type transformers, also using the principle of electromagnetic induction, the main isolation of the primary power supply circuit, the secondary circuit to the ground float, so that the primary side and the secondary side of the electrical insulation, but also to make the circuit isolation to ensure the safety of electricity.
? To know why isolation transformers? , first of all, to understand China's power supply system, China's power supply system in the supply of low-voltage users, generally take the three-phase four-wire system, neutral grounding, in layman's terms, that is, to the residents of the home of the two wires, one is the phase line (fire), the other is the zero line, which is and the earth with the status, when the human body due to touching the phase line, it will make the current through the human body, and the earth constitutes a circuit, resulting in electrocution hazards.
? If the use of isolation transformer, it will be safer, because the primary and secondary is through the magnetic field exchange of energy, the primary, secondary no electrical connection between; but through the voltage generated by electromagnetic induction, the secondary two lines are not grounded, the secondary line and the earth there is no potential difference, so the human body touching any line will not be electrocuted. However, if the human body contacts both ends of the secondary, there is still a risk of electric shock.
Prevention of electric shock and electromagnetic interference, isolation of signal interference, and so on.