Isolation transformer
Isolation transformer belongs to the safety power supply, generally used for machine repair, maintenance, protection, lightning protection, filtering function.
The principle of isolation transformer is the same as that of ordinary transformer. They all use the principle of electromagnetic induction. Isolation transformers generally (but not all) refer to 1:1 transformers. Although the secondary is not connected to the earth, there is still a potential difference and a phase difference of 180 degrees between the secondary line and the earth, which is dangerous.
Power supplies for control transformers and vacuum tube devices are also isolation transformers. Power sources such as tube amplifiers, tube radios and oscilloscopes, and lathe control transformers are isolating transformers. For example, 1:1 isolation transformer is commonly used for safety maintenance of color TV sets. It is also used in air conditioning.
First of all, we usually use AC power supply voltage one line and the earth is connected, the other line and the earth has a potential difference of 220V. Human contact can produce electric shock. The secondary isolation transformer is not connected with the earth, and there is no potential difference between any two lines and the earth. You can't get electrocuted by touching any line, so it's safer.
Secondly, the output end of the isolation transformer with the input end is completely "open" isolation, so that the effective input end of the transformer (power grid supply voltage) has played a good filtering role, so as to provide a pure power supply voltage to the electrical equipment.
Another use is to prevent interference. It can be widely used in subway, high-rise buildings, airports, stations, wharfs, industrial and mining enterprises and tunnel transmission and distribution and other places.
Isolation transformer refers to the transformer whose input winding and output winding are electrically isolated from each other, so as to avoid the danger caused by accidentally touching live bodies (or metal parts that may be charged due to insulation damage) and earth at the same time. Its principle is the same as that of ordinary dry transformers, which also uses the principle of electromagnetic induction to isolate the primary power loop, and the secondary loop is floating to the ground. To ensure the safety of electricity.
