Abstract
The paper presents a methodology for researching the levels of higher harmonic in networks with a voltage of 6 kV and developed measures to eliminate harmonics of the non-canonical series. According to the results of the research, it was found that the sources of high-er harmonic ones are the ATP-500 traction substations, connected to the 6 kV network in groups and alone. In the 6 kV network, the 3rd, 5th, 7th and 11th harmonics of the canonical series, as well as the 3rd, 4th, 6th and 8th harmonics of the non-canonical series, are distin-guished, the levels of which significantly exceed the permissible levels according to GOST. The presence of non-canonical harmonics is caused by the asymmetry of the bridge circuit (current asymmetry relative to the abscissa axis). An instruction has been developed for the pre-start check of the bridge circuit gates to eliminate asymmetry. The prevalence of 5 and 7 higher harmonics in the 6 kV network was established and it was recommended to take into account the possibility of resonance phenomena in the pulse-phase control circuits of electric drives connected to the 6 kV network of the mine and open pit. The implementation of the recommen-dations set forth in the work increases the reliability of the bridge circuits of traction substa-tions and eliminates the possibility of the appearance of non-canonical harmonics, which im-proves the voltage quality in accordance with the requirements of GOST.
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