Isolation transformer working principle
The principle of the isolation transformer is almost the same as that of the ordinary transformer. The principle of electromagnetic induction is used to isolate the primary power supply circuit and the secondary circuit is floating to the ground to ensure safe use of electricity. The isolation transformer generally refers to a 1:1 transformer. Since the secondary is not connected to the ground, there is no potential difference between any of the secondary lines and the ground. It is safe to use and is often used as a maintenance power source.
However, the isolation transformers are not all 1:1 transformers, and the power supply for controlling transformers and tube equipment is also an isolation transformer. For example, tube amplifiers, tube radios and oscilloscopes and lathe control transformers are all isolated transformers. For example, for the maintenance of color TVs, the 1 to 1 isolation transformer is commonly used. The isolation transformer is used more and is used in air conditioners.
The role of the isolation transformer
Generally, although there is an isolation circuit between the original and secondary windings of the transformer, in the case of a high frequency, the capacitance between the two windings still causes electrostatic interference between the circuits on both sides. In order to avoid such interference, the primary and secondary windings of the isolation transformer are generally placed on different cores to reduce the capacitance between the two; the original and the secondary windings are concentrically placed, but are placed between the windings. Electrostatic shielding for high immunity to interference.
The isolation transformer is theoretically a safe power source, which is generally used for machine maintenance and maintenance, and functions as protection, lightning protection and filtering. The isolation transformer is a 1/1 transformer. Primary single phase 220V, secondary is also single phase 220V. Or the primary three-phase 380V, the secondary is also three-phase 380V.
Usually, we use an AC power supply voltage connected to the ground and a 220V potential difference between the other line and the ground. Human contact can cause electric shock. The secondary of the isolation transformer is not connected to the earth, and there is no potential difference between any two lines and the earth. It is safer for people to touch any line without electric shock.
The output of the isolation transformer is completely open-circuited from the input, which effectively acts as a good filter for the input of the transformer (the supply voltage supplied by the grid). This provides a clean supply voltage to the consumer. Another use is to prevent interference. It can be widely used in subways, high-rise buildings, airports, stations, terminals, industrial and mining enterprises and tunnels.
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