Transformer capacity calculation formula_Transformer power calculation formula-Solutions-华强电子网

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The power of the transformer is determined by the load: P2=U2II2I+U2III2II+...+U2nI2In(VA)P1=P2/η(VA)

Where: P2 transformer secondary power calculation value, P1 transformer primary power calculation value, U2I and U2II... Transformer secondary winding voltage (V), the value of which is determined by the load.

I2I and I2II... Transformer secondary winding current (A), the value of which is determined by the load. η is efficiency

Transformer capacity below 1KVA transformer capacity is small, low efficiency, generally can take η = 0.8 to 0.9, for transformer capacity below 100VA, η choose small value; transformer capacity from 100VA to 1000VA choose a large value. The quality of silicon steel sheet is η 0.7

I1=P1/U1 (1.1 to 1.2) (A)

Where: U1 is the primary voltage (V)

1.1 to 1.2 is an empirical coefficient that takes into account the no-load excitation current

After the transformer capacity is calculated, other parameters such as the cross-sectional area S of the silicon steel core can be calculated.

Station transformer capacity calculation formula