Safety isolation transformerA transformer with electrical isolation between the input and output windings. Safety isolation transformers are used to avoid accidental contact with charged bodies. The isolation of the transformer is the isolation of the individual currents of the primary and secondary windings. In the early days, it has been used in the power industry in European countries, and is widely used in the electronics industry or industrial and mining enterprises, general-purpose circuit control power supplies, safety lighting and indicator lights in machine tools and mechanical equipment.
A special transformer with high dielectric strength between the primary and secondary windings, which can isolate different potentials and suppress common mode interference. The transformation ratio of the safety isolation transformer is usually1：1.
Safety isolation transformer is a safe power supply, usually used for machine repair and maintenance, to protect against lightning and filtering.
The principle of safety isolation transformer is the same as that of ordinary transformer. All use the principle of electromagnetic induction. Safety isolation transformers are usually (but not exclusively)1：1Transformers. Although the secondary coil is not grounded, there is still a potential difference between any wiring between the secondary coil and ground and180Degree of phase difference, this is very dangerous.
The power supply of the control transformer and the tube equipment is also a safety isolation transformer. Power supplies such as tube amplifiers, tube radios and oscilloscopes, and lathe control transformers are safety isolation transformers. For example, it is common to use1：1Safety isolation transformer to safely maintain color TV. It is also used for air conditioning.
First of all, we usually use an AC power supply voltage line to connect to the ground, and there is a difference between the other line and the ground220VThe potential difference. Physical contact may result in electric shock. However, the secondary of the safety isolation transformer is not grounded, and there is no potential difference between any two wires and the ground. If you touch any line, you will not get an electric shock, so it is safer.
Secondly, the output and input terminals of the safety isolation transformer are completely"Open circuit" isolation, which effectively filters the input of the transformer (power supply voltage from the grid). This provides a pure supply voltage for electrical equipment.
Another use is to prevent interference. It can be widely used in subway, high-rise buildings, airports, stations, docks, industrial and mining enterprises and tunnels and other places.
A safety isolation transformer refers to a transformer in which the input winding and the output winding are electrically isolated from each other to avoid accidental contact with charged bodies (or metal parts that may be charged due to insulation damage) and the ground. The principle is the same as that of ordinary dry-type transformers, but it also uses the principle of electromagnetic induction to isolate the primary power circuit and the secondary circuit from floating to the ground to ensure the safety of electricity.