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

Basics of transformer partial discharges