Why couldn’t power plants have accepted the loss?
From the technical point of view of the 19th century. the main reason for eliminating DC power is the problem of line loss (that is, power loss on the line). Using this kind of low-voltage (110V) transmission takes many prices. to send electricity over a long distance.
First of all, with the transmission distance increase. the equal resistance R of the line increases, and the line loss increases. and the line loss can even reach more than 50%. In other words, if the power plant produces 1000W of electricity.
Then the user may only get 500W of electricity, and 500W of power will lost on the transmission line. This kind of loss is unwilling to accept by any power plant.
Voltage (power quality, voltage drop) problem
If using low voltage DC transmission (110V). users near the power plant can guarantee that the voltage they get is close to 110V.
In contrast, users far away from the power plant may only get 80V. affecting electrical appliances’ use and life.
Some people will ask
Why not increase the voltage emitted by the generator a little bit? It can promote, but in the end, we should still be responsible for the users.
If the voltage rises to 140V, the user at the end of the power plant will get a voltage of 110V. while the user near the power plant will have to bear the voltage of 140V.
This voltage will exceed the rated voltage of the appliance. and it will also damage the machine and reduce its service life.
Use the Transformer
If you only know that the Transformer has the function of raising and lowering the voltage. you can forget to ask this question.
1. The principle of Transformer, the Magnetic effect of current.
2. The impact on the principle of electromagnetic induction, the electromagnetic field in which the alternating current produces a change.
3. The focus, the changing electromotive force created by the changing electromagnetic field.
It cannot separate from the word “alternating”. so it destine to belong to the product of alternating current.
If we use high voltage transmission. we want to cut off the fault current during the fault, when there is often a large arc. if ARC doesn’t cut off in time, it will damage the power system. Compared with DC, AC zero crossing, It will extinguished. but DC does not exist; the manufacture of circuit breakers.
AC circuit breakers are more comfortable to achieve. Even now, the AC circuit breaker update several times, and the technology is quite mature. Pls, click here for our products on the website.