The main function of isolation transformer
The main function of isolation transformer
An isolation transformer refers to a transformer with electrical isolation between the input winding and the output winding. The isolation transformer is used to avoid accidentally touching the charged body at the same time. The isolation of the transformer is to isolate the currents of the primary and secondary windings. In the early days, it was used in the power industry in European countries. It is widely used in the electronic industry or industrial and mining enterprises, machine tools and mechanical equipment in general circuit control power supply, safety lighting and indicator power supply.
There are special transformers with high insulation strength between the primary and secondary windings to isolate different potentials to suppress common mode interference. The transformation ratio of the isolation transformer is usually 1: 1.
Isolation transformer is a safe power supply, generally used for machine repair and maintenance, and plays the role of protection, lightning protection and filtering.
The principle of isolation transformer is the same as that of ordinary transformer. Both use the principle of electromagnetic induction. Isolating transformers generally (but not all) refer to 1: 1 transformers. Since the secondary is not connected to the ground, there is no potential difference between any secondary line and the ground, but it is safe to use. Often used as a maintenance power source.
The power supply for controlling transformers and electronic tube equipment is also an isolation transformer. Power sources such as tube amplifiers, tube radios and oscilloscopes, and lathe control transformers are isolation transformers. For the safe maintenance of color TV, 1: 1 isolation transformer is commonly used. It is also used in air conditioning.
First of all, we usually use one line of AC power supply voltage connected to the ground, and the other line has a potential difference of 220V between the ground and the ground. Contact with people can cause electric shock. The secondary of the isolation transformer is not connected to the ground, and there is no potential difference between any two wires and the ground. There is no electric shock when people touch any line, so it is safer.
Secondly, the output end of the isolation transformer is completely “open” isolated from the input end, which effectively plays a good role in filtering the input end of the transformer (the power supply voltage supplied by the power grid). Thus providing a pure power supply voltage to the electrical equipment.
Another use is to prevent interference. It can be widely used in the transmission and distribution of subways, high-rise buildings, airports, stations, docks, industrial and mining enterprises and tunnels.
Isolation transformer refers to a transformer where the input winding and the output winding are electrically isolated from each other, to avoid the danger of accidentally touching live objects (or metal parts that may be charged due to insulation damage) and the earth at the same time. Dry-type transformers are the same, but also use the principle of electromagnetic induction, mainly to isolate the primary power circuit, and the secondary circuit floats to the ground to ensure the safety of electricity.
The main function of the isolation transformer is to completely insulate the electrical from the primary side and the secondary side, and also isolate the circuit. In addition, the high-frequency loss of its iron core is used to suppress high-frequency clutter from entering the control loop. The isolation transformer is used to suspend the secondary ground, and it can only be used in the occasions with small power supply range and short circuit. At this time, the capacitance current of the system to ground is too small to cause personal injury. Another important role is to protect personal safety! Isolate dangerous voltage.
With the continuous development of the power system, the transformer plays an increasingly important role as a key device in the power system. Its safe operation is directly related to the reliability of the operation of the entire power system. Transformer coil deformation means that the coil occurs after the force is applied. Dimensional changes in the axial and amplitude directions, body displacement, coil distortion, etc. There are two main reasons for the deformation of the transformer coil: one is the inevitable impact of external short-circuit faults during the operation of the transformer; the second is the accidental collision of the transformer during transportation and lifting.