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NOHÁČOVÁ, L., ŽÁK, F., KROPÁČEK, V.
CAPACITIVE EARTH-FAULT CURRENT IN DISTRIBUTION NETWORKS OPERATED WITH THE ISOLATED NEUTRAL POINT
KOMUNALNA ENERGETIKA / POWER ENGINERING, 29
This paper deals with the method of solution of capacitive earth-fault current in distribution. The value of phase earth capacity in the network can be determined using the voltage ratio in the network and the capacity value of the connected capacitor. The new indirect method of measurement and calculation of phase-earth capacity in networks with isolated neutral point is based on creation of short-term phase capacity asymmetry in the network. When expanded, the method can be also used for leakage current estimation. Furthermore, this method can be applied to periodic controls of the earth capacitive current value. For the evaluation of the phase earth capacity, a single-purpose automatic can be used and thus the whole process of measurement and evaluation is conducted with a defined period (at a given hour, day, month…) or on operator’s command.

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