What is a transformer: A transformer generally has two functions, one is the buck-boost function, and the other is the impedance matching function. Let’s talk about buck-boost first. There are many kinds of voltages generally used, such as 220V for living lighting, 36V for industrial safety lighting, and the voltage of the welding machine also needs to be adjusted, all of which are inseparable from the transformer. According to the principle of electromagnetic mutual inductance between the main coil and the secondary coil, the transformer can reduce the voltage to the voltage we need.
In the process of long-distance voltage transmission, we should increase the voltage to a very high level to reduce the loss of voltage, generally rising to several thousand volts or even tens of kilovolts, which is the role of the transformer.
Impedance matching: The most common is in electronic circuits. In order to make the signal smooth, the transformer is generally selected for impedance matching. For example, in the old broadcast, because the fixed pressure is selected for export, the speaker is a high-resistance speaker, so only the output transformer can be used for matching. Therefore, daily life cannot be separated from transformers, and industrial production cannot be separated from transformers.
Brief introduction of box-type substation: The box-type substation is composed of high-voltage power distribution cabinet, power transformer, low-voltage power distribution cabinet, etc. It is installed in a metal box, and the three parts of equipment have a space to protect each other. Box-type substations are a relatively new piece of equipment.
Advantages of box-type substations:
(1) Small footprint, suitable for installation in general urban load-intensive areas, rural areas, residential areas, etc., which is conducive to high-voltage extension, reduces the power supply radius of voltage lines, and reduces line damage.
(2) Reduce the cost of civil infrastructure, can be mass-produced, reduce on-site construction period, less investment, and significant effect.
(3) Small size, light weight, easy to install and move.
(4) Sealed transformers can be used, and new equipment such as sf6 ring network cabinets have the characteristics of long cycle, maintenance-free and complete functions, and are suitable for terminals and ring networks.
(5) Environmental protection, novel and beautiful appearance, widely used in temporary electricity, industrial areas, residential quarters, commercial centers and other building electricity needs, relatively harmonious with the environment.