The tolerance limit for a distribution network operating at a voltage level of 400 V is ±10 %. In this scenario, a voltage of 430 V is frequently observed within the distribution networks. This phenomenon may arise from the use of non-linear devices (which generate higher harmonics), the low short-circuit power of voltage sources (leading to voltage fluctuations), among other factors.
We advise the use of capacitors that have a higher nominal voltage than that of the distribution network. For a 400 V distribution network, we suggest employing capacitors with a nominal voltage of 440 V, as well as capacitors rated at 480 V for detuned power factor correction in conjunction with reactors.
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