Any kind of electric equipment will suffer loss during long-term operation, and galia transformatoriai are no exception. In the loss of power transformers, it is most divided into parts: copper loss and iron loss.
Varis Nuostolis
varis groja an svarbu role in the transformer, the winding of the transformer paprastai uses copper wires, and the "copper loss" in the transformer is the loss of copper wires. The "copper loss" of the transformer is also known as the load loss, that is, the variable loss, whch is changing. When the transformer is running under load, the current will have resistance per the wire, resulting in resistance loss. Pagal to Joule's law, the current flowing through this resistor will generate Joule heat, and the greater the current, the greater the power loss. So, the resistance loss is proportional to the square of the current and is independent of the voltage. It is precise because it changes with the size of the current, so the copper loss (load loss) is a kintamasis nuostolis, it is taip pat pagrindinis nuostolis in transformatorius operacija.
Įtakoja Faktorius
Dabartinis dydis: As minėta aukščiau, varis nuostolis is proporcingas to the square of the current, so the size of the current is a key factor affecting copper loss.
Apvija Varža: The resistance of the winding directly affects the copper loss. The greater the resistance, the higher the copper loss.
The number of coil layers: The more the number of coil layers, the longer the path of current flow in the winding, the resistance will increase corfully, resulting in increased copper loss.
Perjungimas dažnis: The effect of switching frequency on the copper loss of the transformer is directly related to the distribution parameters of the transformer and the load characteristics. When the load characteristics and distribution parameters are inductive, the copper loss decreases with the increase of switching frequency. The copper loss increase with the increase of switching frequency when they are both talpive.
Temperatūra efektas: The load loss is also affected by the temperature of the transformer, while the leakage flux caused by the load current will produce eddy current loss in the winding and stray loss in the metal part outside the winding.
Formulė režimas
1. copper loss(unit:kW)=I² × Rc × Δt, I is the rated current of the transformer, Rc is the resistance of the copper wire, and Δt is the operation time of the transformer.
2. varis nuostolis =I² × R, I is the rated current of the transformer, R is the total copper resistance of the transformer.
R=(R1 + R2) / 2, R1 is the primary side copper resistance of the transformer, and R2 is the secondary side copper resistance of the transformer.
Metodai sumažinimas varis žala
1. Padidėjimas apvija skerspjūvis plotas transformatorius: sumažinimas laidininkas varža, efektyviai mažinimas transformatorius varis nuostoliai.
2. Naudokite aukštos kokybės laidininkas medžiagos toks varis folija arba aliuminis folija redukcija apvija atsparumas .
3. Redukcija the light-load operation time of the transformer: limiting the proportion of the light-load operation time of the transformer is conducive to reduction the copper loss of the transformer.
