Losses occur in any kind of electrical equipment over a long period of time, and power transformers are no exception. In the power transformer lossIn the power transformer loss, mainly divided into copper loss and iron loss two parts. Copper lossDefinition and principleCopper in the transformer plays an important role in the transformer winding will usually use copper wire, which transformer ‘copper loss’ is the copper wire loss.The ‘copper loss’ in a transformer is the loss produced by the copper conductor. The ‘copper loss’ of a transformer is also called the load loss. The so-called load loss is a variable loss, which changes.When the transformer is operated under load, the current through the wire will have resistance, resulting in resistance loss. According to Joule’s law,

Transformer loss calculation method Transformer loss power is divided into iron loss and copper loss, iron loss, also known as no-load loss, is its fixed loss, the real is the loss generated by the iron core (also known as iron core loss, and copper loss is also called load loss). One Transformer loss formula (1) active loss: ΔP = Po + KT β2 Pk (2) reactive power loss: ΔQ = Qo + KT β2 Qk (3) Comprehensive power loss: ΔPz = ΔP + KQΔQ Qo ≈ Io%Sn, Qk ≈ Uk%Sn Where: Qo – no-load reactive power loss (kvar) Po – no-load loss (kW) Pk – rated load loss (kW) Sn–Transformer rated capacity (kVA) Uk% – short-circuit voltage percentage β–Load factor, the ratio of load current