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JELENC, B.
DETECTING DEFECTIVE FEEDER DURING HIGH IMPEDANCE PHASE TO EARTH FAULT IN ELECTRICAL DISTRIBUTION SYSTEM –SUBSTATION USING ARTIFICIAL INTELIGENCE
KOMUNALNA ENERGETIKA / POWER ENGINERING, 17
Recent developments indicate that Artificial Neural Networks (ANNs) may be appropriate for assisting dispatchers in operating electric power systems. This paper presents approach to detection defective feeder during phase to earth fault (also high impedance faults) in electrical distribution system –substation using feed- forward artificial neural network (ANN).
In the ANN algorithm, the standard back-propagation technique with a sigmoid activation function is used. The proposed neural network was trained by real data recorded with Disturbance recorder during actual fault.
Performance study results show that the proposed algorithm performs very well in detecting the phase to earth fault and locating faulty feeder.
ROŠER, M., ŠKOF, R., ŠTUMBERGER, G.
EARTH FAULT IN MEDIUM VOLTAGE DISTRIBUTION NETWORKS WITH RESONANT NEUTRAL EARTHING
KOMUNALNA ENERGETIKA / POWER ENGINERING, 19
Reliability of electricity supply is directly related to the supply interruptions, mostly caused by earth faults that appear in medium voltage distribution networks. One of very effective measures, that can substantially reduce the supply interruptions due to the earth fault in medium voltage distribution networks, is resonant neutral earthing. It compensates capacitive currents and reduces the current flowing through the fault which establishes better conditions for arc self-extinguishing at the earth fault location. The paper deals with conditions at the location where vegetation touches the conductor and establishes an earth fault. The results of field-testing performed in substation Krško, where earth faults were established under controlled conditions, using specially for this purpose build mechanical device, are presented and discussed.
HUFNAGL, E., FICKERT, L., SCHMAUTZER, E.
EFFICIENT CALCULATION OF EARTH FAULT CURRENTS IN COMPENSATED NETWORKS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 29
In this paper, a simplified approach for determining the ground fault currents is presented which is specifically useful in compensated systems. In this case, due to the estimation of the relative magnitudes of the equipment parameters, the equivalent circuit in symmetrical components of the single-pole fault is significantly reduced. Thus the electrical parameters of the impedances can be directly used.
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