Is that true that underground cables with no power factor correction have resonances in range of frequencies which leads to multiple zero crossing distorted waveform?
But why? Is that is because it work as a band-pass filter?
From the book Electrical Power Systems Quality:
While they may cause interference with low-power electronic devices, they are usually not damaging to the power system. It is also difficult to collect sufficiently accurate data to model power systems at these frequencies. Acommon exception to this occurs when there are system resonances in the range of frequencies. These resonances can be excited by notching or switching transients in electronic power converters. This causes voltage waveforms with multiple zero crossings which disrupt timing circuits. These resonances generally occur on systems with underground cable but no power factor correction capacitors.