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PINTARIČ, M., ROŠER, M., ŠTUMBERGER, G.
Optimization of Distribution Network Operation Based on Reconnection, Clossed-Loop Operation and Reactive Power Generation – A Case Study
KOMUNALNA ENERGETIKA / POWER ENGINERING, 221
The paper deals with problems of increasing the load in the distribution network that already operates near the limit load. Optimization procedure with reconnections, operation in loop and reactive power generation is being used to determinate maximal acceptable load. All analyses are made with program for load flow calculations. This paper shows results of the load flow calculations on the existing distribution network. Maximal power of two industrial consumers, which want to increase their power, was calculated based on the maximal load of the network without considering distribution generation. Operation of network in loop is also analyzed at normal network load and at maximal load. Solution to problem of too high voltage in the network, because of big distribution generation, is presented.
SOTLAR, T., PIHLER, J., ROŠER, M.
IMPACT OF THE GENERATOR TO SHORT-CIRCUIT CONDITIONS IN THE DISTRIBUTION NETWORK
KOMUNALNA ENERGETIKA / POWER ENGINERING, 27
The article deals with the analysis of the impact of the generator to short-circuit conditions in the distribution network. The aim is to determine the effect of synchronous generator on short-circuit currents, which are at the point of connection baseline data for the design and sizing of individual network elements. Short-circuit currents will be in point of short circuit determined using a DMS software tool that is developed for the analysis of the actual situation in the network and also enables the calculation of the parameters of all types of short circuits. Analysis of the impact of the generator to the short-circuit currents in the distribution network is carried out in point near the generator and point away from the generator by comparing the results with the generator on and off.
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.
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