The power loss of the transformer mainly includes active power loss and reactive power loss. The calculation formula is as follows:
1. Active power loss (ΔP): ΔP = P0 + KTβ²PK
2. Reactive power loss (ΔQ): ΔQ = Q0 + KTβ²QK
in:
* P0 represents no-load loss (kW), which is the transformer iron loss.
*PK represents the rated load loss (kW), which is the copper loss under the rated load of the transformer.
* Q0 represents the no-load reactive power loss (kvar), which is approximately equal to the product of the no-load current percentage I0% and the rated capacity SN of the transformer.
* QK represents the rated load magnetic leakage power (kvar), which is approximately equal to the product of the short-circuit voltage percentage UK% and the rated capacity SN of the transformer.
* β represents the load rate, which is the ratio of actual load to rated load.
*KT represents load fluctuation loss coefficient, which is related to the size of load fluctuation.
The combined power loss (ΔPZ) can be calculated from the active and reactive losses: ΔPZ = ΔP + KQΔQ. Among them, KQ is the economic equivalent of reactive power, and its value depends on the specific parameters of the transformer and the operating conditions of the power grid.
Please note that these formulas provide a basic method for calculating the power loss of a transformer, but in actual applications, other factors need to be considered, such as the type of transformer, operating environment, load characteristics, etc. Therefore, when making specific calculations, it is recommended to refer to the technical manual of the transformer or consult a professional engineer to ensure the accuracy and reliability of the calculation.
In addition, for different types of transformers (such as oil-immersed transformers, dry-type transformers, etc.), the loss calculation may need to consider specific factors and methods, and the specific calculations should be made with reference to relevant standards and specifications.
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