Isolation Transformer And Ordinary Transformer Difference

The primary task of ordinary transformers (including non-isolated transformers) is to change the voltage, which is divided into step-down transformers and step-up transformers, and the number of turns of the original secondary side coil is not equal. Isolation is not its main task, and some transformers are not isolated, such as autotransformers are typical.

The primary task of the isolation transformer is to isolate the primary secondary winding electrically, so the most basic requirement for it is to ensure the insulation performance of the primary secondary winding. The transformer is not its primary task, and most isolation transformers do not perform transformer, that is, the number of turns of the original secondary winding is equal. For example, the pulse transformer used in the thyristor DC speed control system to prevent the main circuit high voltage intrusion into the pulse numerical control device is also typical.

Special features of isolation transformer:

➤ Primary grounding, secondary not grounding;

➤ The first stage of the line package room and isolation layer! The isolation layer is connected to the primary grounding terminal, that is, the isolation layer is grounded. So the secondary end is isolated from the power grid and electrostatic field!

Because the secondary is not grounded, the output end does not form a loop with the ground, and there is no electric shock when the human body touches the output single-end. And because of electrostatic isolation, electrostatic interference and electrostatic breakdown are avoided in secondary work!

Isolation transformer is commonly known as safety transformer, it is generally used to isolate the impurities of the grid power and maintenance equipment. The principle of isolation transformer is the same as that of ordinary transformer. They all use the principle of electromagnetic induction. Isolation transformers generally refer to 1:1 transformers. Because the secondary is disjointed. There is no potential difference between any of the secondary wires and the ground. Safe to use, commonly used as a maintenance power supply.

Isolation transformers are not all 1:1 transformers, control transformers and the power supply of vacuum tube equipment is also isolation transformers. Power supplies such as tube amplifiers, tube radios and oscilloscopes and lathe control transformers are isolating transformers. For example, for safety maintenance of color TV sets, 1 to 1 off-transformer is commonly used. Because the secondary is disjointed. There is no potential difference between any of the secondary wires and the ground.