Transformer loss calculation - Solutions - Huaqiang Electronic Network

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

Photocoupler

Let's take a look at some calculation formulas for transformer loss. I hope that it will work for everyone in actual production. The higher the uniform load factor of the load curve, the smaller the loss power is, the smaller the loss ratio is. The lower the load factor of the load curve is, the smaller the loss power is, the larger the loss ratio is. Multiply the uniform load factor of the load curve by a multiple greater than 1, usually 1-1.3, as the load factor for the best efficiency, and then calculate the loss ratio of the transformer according to βb=(1/R)1/2.
1. Calculation formula of transformer loss (1) Active loss: ΔP=P0+KTβ2PK -------(1)
(2) Reactive loss: ΔQ=Q0+KTβ2QK -------(2)
(3) Comprehensive power loss: ΔPZ=ΔP+KQΔQ ----(3)
Q0≈I0%SN, QK≈UK%SN
Where: Q0 - no-load reactive loss (kvar)
P0 - no-load loss (kW)
PK - rated load loss (kW)
SN - transformer rated capacity (kVA)
I0% - the percentage of transformer no-load current.
UK% - short circuit voltage percentage β - uniform load factor KT - load fluctuation loss factor QK - rated load leakage magnetic power (kvar)
KQ - reactive economy equivalent (kW/kvar)
2. Prerequisites for the selection of each parameter in the calculation of the above formula:
(1) Take KT=1.05;
(2) When the minimum load of the 6kV～10kV step-down transformer of the urban power grid and the industrial enterprise power grid is taken, the reactive power equivalent KQ=0.1kW/kvar;
(3) Uniform load factor of transformer, β=20% for agricultural transformers; for industrial enterprises, three shifts, β=75%;
(4) Transformer operation hours T=8760h, maximum load loss hours: t=5500h;
(5) Transformer no-load loss P0, rated load loss PK, I0%, UK%, as shown in the product data.