SLG fault detection in presence of strong capacitive currents in compensated networks

Abstract : The detection of single line-to-ground (SLG) fault in compensated distribution networks can be hampered by important capacitive currents. The way of dealing this problem depends on particular regime where data is acquired. In transient regime the relays diagnosis based on analysis of charging components can deceive in massive presence of discharging currents. The latter however will disclose data for directional function, if sampling frequency is high enough for acquisition in wave propagation area. The fault detection can also be out of reach of steady state methods which are based on detection of active component in faulty currents. Efficiency of these methods vanishes when strong capacitive currents squeeze the phase shift between faulty and sound zero sequence currents below actual acquisition limits. In such situation however it is still possible to get the faulty feeder indication from the way the residual currents cross the zero level soon after inception.
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Wan-Ying Huang, Robert Kaczmarek. SLG fault detection in presence of strong capacitive currents in compensated networks. IEEE Transactions on Power Delivery, Institute of Electrical and Electronics Engineers, 2007, 22, pp.2132-2135. ⟨hal-00242746⟩

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