Analysis of the network transition from 10kV to 20kV voltage level

Modeliranu mrežu sa njenim parametrima odnosno uklopnim/isklopnim stanjima temeljimo na analizi mreže koju smo transferirali iz DeGIS-a u Neplan sa opterećenjima na TS 35/10 kV tj. po vodnim poljima, dok je snaga po mreži raspoređena na temelju nazivne snage instaliranog transformatora. Kako bi izbjegli probleme u mreži koji su tehničke naravi (relativno niski naponi, gubici snage) simulacijom u Neplan programu došlo se do poboljšanja naponskih prilika prelaskom na 20 kV napajanje. Najveći gubici javljaju se na dugim vodovima zbog same dužine vodova, ali nije lako predvidjeti probleme s preniskim naponima koji se javljaju nekoliko sati godišnje tokom vršnih opterećenja. U ovom diplomskom radu došlo se do najkritičnijih mjesta u kojima se javljaju najveći gubici dok bi stvarni problem trebalo odrediti u praksi. Ukupni gubici u mreži smanjili su se 3-4 puta dok smo samim prelaskom na 20 kV napon smanjili pad napona i struje kratkih spojeva. Iz tablice 4.8. odnosno 4.20. vidimo da je dio mreže (iz TS 110/35 kV Koprivnice se napaja iz TS 35/10(20) kV Rasinja, koja opskrbljuje izvode Ludbreg i Lukovec) poduzbuđen tj. da su jalove snage kapacitivnog karaktera zbog jako malog ukupnog opterećenja pa podaci nisu relevantni za neki projekt već bi trebalo napraviti analizu pod punim opterećenjem spomenutih trafostanica. Sam prelazak na viši naponski nivo je relativno financijski skup, ali po vidljivom smanjenju gubitaka svakako isplativ kroz godine.We model the modeled network with its parameters or switching / disconnection states based on the analysis of the network we have transferred from DeGIS to Neplan with loads at TS 35/10 kV, ie by water fields, while the power per network is distributed based on the rated power of the installed transformer. In order to avoid network problems that are of a technical nature (relatively low voltages, power losses) by simulation in the Neplan program, there has been an improvement in the voltage potential by switching to 20 kV power. The biggest losses occur on long lines due to the length of the lines, but it is not easy to predict the problems of low voltage that occur several hours a year during peak loads. In this graduate thesis, the most critical places where the greatest losses occur, while the actual problem should be determined in practice. The total losses in the network decreased by 3-4 times, whereas by the simple switching to 20 kV voltage decreased the voltage drop and short circuit current. Table 4.8. or 4.20. we see that part of the network (from TS 110/35 kV Koprivnica is powered by TS 35/10 (20) kV Rasinja, which supplies the performances Ludbreg and Lukovec) is undertaken ie that the reactive power of the capacitive character due to the very small total load and data were not relevant for some project, it would be necessary to make an analysis under full load of these transformers. Moving to a higher voltage level is a relatively financial constraint, but for a noticeable reduction in losses, it is certainly viable for years