| 摘要 |
In modern electrical networks, particularly industrial networks with 12 - pulse converters in variable speed drives (VSD), for both D.C. and/or A.C. motors, values of 11th and 13th harmonics are highest. Therefore, ant resonant filters, for harmonics υ ≥ 11, are necessary in capacitor banks, especially for harmonics of 11. and 13 order.Invention "Forming undivided filters section of capacitors for harmonics of 11. and 13. order in network with D/Y and Y/D connection transformer" enables that the series resonant or anti-resonant capacitor section, for 11. and 13. order harmonics, form only from one branch, instead of from four branch of series resonant capacitor sections for every lower order harmonics (5, 7, 11 and 13 order), as it is usually, as there is not risk to be formed parallel resonant circuit for currents of 6. and 9. harmonic. Transformer with D/Y and Y/D connection are open circuit for currents of 3n order.Single line diagram of middle voltage network with capacitor (QC=QC11) on lower voltage side of transformer (Tr), as well as corresponding equivalent circuit for high harmonics, are shown in figure 2 and figure 3b. |
