Browsing by Subject "capacitance to earth"
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Item type:Article, Access status: Open Access , Influence of indirect frequency converters on operation of central leakage protection in underground coalmine networks(Wydawnictwa AGH, 2017) Marek, AdamThis paper presents considerations for leakage protections operating in underground coalmine networks containing loads that include frequency converters. The possibility of malfunctions in leakage protections has been proven in the case of a reduction of leakage resistance in a DC circuit.Item type:Article, Access status: Open Access , Operation analysis of leakage protection including auxiliary current source operating as series ohmmeter systems(Wydawnictwa AGH, 2017) Marek, AdamThis paper outlines issues related to the features of the leakage protections, especially the resistance of central leakage protections provided with the auxiliary current source to network interferences. It reveals susceptibility of the central leakage protections to this type of interferences (especially in the case of usage current sources of small rated currents).