Difference between isolation transformer and ordinary transformer
2022-11-01
Isolation transformer, also known as safety transformer, is a transformer that electrically insulates the input winding and output winding, and is used to electrically insulate two or more coupled circuits. Now let's learn the difference between isolation transformer and ordinary transformer!
The isolation transformer is generally used for the maintenance of machinery and plays the role of protection, lightning protection and filtering to avoid accidental simultaneous contact with live bodies. The transformer isolates the current of the primary and secondary windings. Isolation transformers were initially used in the power industry in European countries, and were widely used in the electronic industry or industrial and mining enterprises, machine tools and mechanical equipment for the control power supply of general circuits, safety lighting and power supply of indicator lights
Difference between isolated transformer and ordinary transformer
The primary task of ordinary transformer (including uninsulated transformer) is to change the voltage, which is divided into step-down transformer and step-up transformer. The turns of primary and secondary windings are not equal. Isolation is not its main task, and the primary and secondary sides of some transformers are not isolated. For example, autotransformers are typical.
As the primary task of insulation voltage transformation is to electrically isolate the primary and secondary windings, the most basic requirement is to ensure the insulation performance of the primary and secondary windings. Transformation is not its primary task, and many insulated transformers do not transform. That is, the turns of the original secondary winding are equal. For example, in the thyristor DC speed regulating system, the pulse transformer used to prevent the high voltage of the main circuit from invading the pulse numerical control device is also typical.
Special features of isolation transformer:
There is an isolation layer between the wire bundles of primary grounding, secondary ungrounded primary! Since the isolation layer is connected to the primary grounding terminal, that is, grounded to the isolation layer, the secondary terminal is isolated from the power grid and the electrostatic field!
Since the secondary side is not grounded, the output terminal and the grounding do not constitute a circuit, and even if one end of the human body contacts the output, it will not get an electric shock. In addition, due to electrostatic isolation, electrostatic interference and electrostatic damage can be avoided in the secondary action!
Isolation transformer, commonly known as safety transformer, is generally used to isolate impurities and maintenance equipment of the city grid. The principle of insulated transformer is the same as that of ordinary transformer. The principle of electromagnetic induction is used. Insulated transformer generally refers to 1:1 transformer. Because the second time is not in harmony. There is no potential difference between any line of the secondary and the ground. It is safe and often used as a maintenance power supply.
The isolation transformer is not always 1:1, and the power supply of control and electronic tube equipment is also an isolation transformer. The power supplies such as electronic tube loudspeaker, electronic tube radio, oscilloscope and lathe control transformer are all insulated transformers. For example, in order to safely repair color TV sets, one-to-one transformers are often used. Because the second time is not in harmony. There is no potential difference between any line of the secondary and the ground.
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