![]() Difference in instantaneous voltages drives neutral.How Paralleling Dissimilarly Pitched GeneratorsĬreates Neutral Circulating Current (cont.) © 2015 Mirus International | All Rights Reserved Can also apply when paralleling alternate energy sources with.Differences in Phase-Neutral (Ph-N) instantaneous voltages will.Generators with different pitch configurations will have slightly.How Paralleling Dissimilarly Pitched Generators creates Resistance to the flow of circulating currents – the low zero sequence impedance presents little Results in less 3rd harmonic voltage distortion under – it has very low zero sequence impedance which Many claim that a 2/3rd pitch generator is better for 3rd.The amount of circulating neutral current Generator zero sequence impedance directly impacts.Pitch, especially zero sequence impedance Generator impedances vary with respect to winding.Reference: ‘Generator Winding Pitch and Harmonics, Engine Data Sheet EDS 70.4, Voltages based on respective harmonic fluxes – Pitch factors below are used to predict harmonic Harmonic content in voltage will also vary based on.Voltage waveform produced by a generator will vary. ![]() ![]() 2 x 800kW Generators with 1500kVA Utility Transformer.GENLINK Dissimilar Pitch Neutral Limiter (DPNL).Traditional methods used to prevent generator circulating.How paralleling dissimilarly pitched generators creates.© 2015 Mirus International | All Rights ReservedPrivate and Confidential | Mirus International Preventing Circulating Currents in Parallel Generator Power Quality You Can Trust | Real World Experience | A History of Innovation Preventing circulating current in parallel generator applications Sizing Neutral Blocking Solution for Specific Applications Adding Circulating Path Impedance without Effecting Ground Fault Path Effective Method for Reducing Circulating Current Understanding Generator Pitch and Harmonics The problem is particularly evident when the generators are built with dissimilar pitches but is also very common when generators are paralleled with Utility transformers for Distributed Generation. MIRUS’ President & CEO, Tony Hoevenaars P.Eng, covered how paralleling generators can lead to very high neutral circulating currents and what can be done to control them. Mirus’ GenLink Dissimilar Pitch Neutral Limiter (DPNL) is a uniquely wound, multiple coil reactor which can be very effective in blocking the flow of circulating current without negatively impacting system fault levels. These circulating currents can cause overheating in the generator windings and false tripping of overcurrent protection devices, especially ground fault schemes. This can result in high levels of triple frequency (180Hz in 60Hz systems) circulating current in the common neutrals or ground connections. Diesel, Natural Gas, Biofuel or other generators used for these applications often run in parallel with themselves or with Utility transformers. As the need for secure and reliable electricity has gown, many opportunities for distributed generation have appeared.
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