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Influence of unbalance of loads in quality of electric enegry in a low voltage line

Kolber P.

Journal of Polish CIMAC

2010

Vol. 5, no 3

55-62

The paper presents results of investigations of deviations of voltage from rated value (äU) and the voltage unbalance coefficient (áU2) at the rural consumers’ sites supplied from the final section of a low voltage line under the load asymmetry conditions. Those parameters are one basic parameters describing quality of electric energy. A probabilistic model of the distinguished parameters, taking into account load unbalance, was built in scope of the investigations. A simulation programme enabling to determine voltage deviation and the voltage unbalance coefficient, among other things, for various variants of the cable cross-sections applied and various variants concerning the types of the consumers connected was elaborated on the basis of the model built; two essential types were distinguished here: living and production consumers characterised by different power consumption rate. The calculations were performed for a three-phase, four-cable airborne power line with flat arrangement of cables.

Increased Power And Energy Losses In Low Voltage Power Line Caused By Load Asymmetry

Kolber P.

Journal of Polish CIMAC

2009

Vol. 4, no 3

49-55

The paper presents a simulation model enabling determination of load resultant active power and energy losses, with regard to load in rural distribution low voltage power networks supplying the so called scattered consumers. The subject of examinations was a three-phase, four-wire, airborne low-voltage power line. The studied type of line is characteristic to, and most commonly used in, rural areas. The considerations included twenty-four-hour load measurement at representative consumers and at the beginning of the line – in a MV/LV transformer station. On the basis of the developed model, a simulation program enabling calculation of power and energy losses has been elaborated. Also, selected results of examinations concerning increase in active power and energy caused by load asymmetry for power line supplying two types of consumers: residential and production ones, have been presented.