Example of an installation before and after power-factor correction
From Electrical Installation Guide
[a] The arrows denote vector quantities.
[b] The cos φ of the workshop remains at 0.75 but cos φ for all the installation upstream of the capacitor bank to the transformer LV terminals is 0.928. As mentioned in Sub-clause 6.2 the cos φ at the HV side of the transformer will be slightly lower (particularly in the pre-corrected case), due to the reactive power losses in the transformer.
[b] The cos φ of the workshop remains at 0.75 but cos φ for all the installation upstream of the capacitor bank to the transformer LV terminals is 0.928. As mentioned in Sub-clause 6.2 the cos φ at the HV side of the transformer will be slightly lower (particularly in the pre-corrected case), due to the reactive power losses in the transformer.
Fig. L28 – Technical-economic comparison of an installation before and after power-factor correction
