The Isolation Transformers Functions is prevent electric shock accidents by isolating the two-phase electricity!
It is a transformer used to electrically isolate two or more circuits with a coupling relationship. It is also known as a safety transformer.Isolation transformers are 1/1 transformers. Both the primary and secondary are single-phase 220V. It is also possible to have 380V three-phase primary voltage, along with 380V three-phase secondary voltage. It should be noted that the AC power supply voltage we usually use is connected to the ground with one wire, and that there is a potential difference of 220V between the other wire and the ground. Electric shocks can occur when humans come into contact with electricity. There is no potential difference between any two lines of the isolation transformer and the ground because the secondary is not connected to the ground. When people touch any line, they will not receive an electric shock. In addition, the isolation transformer’s output end is completely isolated from the input end, which effectively acts as a filter for the input end, providing a pure supply voltage to the electrical equipment.
The principle of isolation transformers
Generally used for machine repair and maintenance, isolation transformers perform the functions of protection, lightning protection, and filtering. Isolation transformers are 1:1 transformers. Both the primary and secondary are single-phase 220V. The primary is three-phase 380V, and the secondary is also three-phase 380V.
A transformer with an isolation transformer has its input and output windings electrically isolated from one another to avoid the danger of accidentally touching live objects (or metal parts that may be charged due to insulation damage) and ground at the same time. The principle of this transformer is the same as that of ordinary dry-type transformers. It uses electromagnetic induction, mostly isolates the power circuit, and floats the secondary circuit to ground to ensure electricity safety.
Among the main functions of isolation transformers are: Primary and secondary electrical isolation is completely isolated, also isolating this loop. Additionally, the iron core’s high-frequency loss suppresses the introduction of high-frequency clutter into the control loop. The use of an isolation transformer to suspend the secondary to the ground is only appropriate in situations where the power supply range is small and the line length is short. In this case, the capacitance current of the system is too small to result in personal injury. It is also very important to protect personal safety from dangerous voltages.
There are three characteristics of isolation transformers:
- Function for converting voltages.
- To achieve high anti-interference characteristics, the primary and secondary windings are placed concentrically, but electrostatic shielding is added between the windings.
- It is a safety power supply used for machine maintenance, protection, lightning protection, and filtering. Its output is completely isolated from its input. Isolation transformers suppress interference caused by lightning, discharges, power grid switching, motor startup, and other power grid disturbances, and the capacitive coupling between the output and the input is small, so they are also referred to as power noise suppressors, meaning that they protect equipment from interference.
Why should we choose an isolation transformer?
We must first understand the power supply system in my country. The power supply system in my country uses a three-phase four-wire system and the neutral wire is grounded. When the human body touches the hot bottom plate, the current will pass through the body and form a loop with the ground, causing an electric shock risk. Using an isolation transformer is safer because the primary and secondary exchange energy through the magnetic field, and there is no physical connection. If the human body touches a charged item, the electrical potential of the item will be made because the human body and the earth are in the same position. Low potential will not result in electric shock.