Single-phase short circuit calculation

U ovom radu opisana je problematika jenopolnog kratkog spoja. Navedene su metode njegova proračuna, a detaljnije je opisana matrična metoda koja se koristi pri većim elektroenergetskim mrežama. U početku je općenito prikazan problem kratkog spoja, te njegovi uzroci i posljedice. Zatim su navedeni dijelovi elektroenergetske mreže, te njihovi utjecaji na struju kratkog spoja. Opisan je i poseban slučaj jednopolnog kratkog spoja, zemni spoj ili zemljospoj. Na kraju je provedena test mreža u NEplanu pri čemu je provedena usporedba struje jednopolnog kratkog spoja u ovisnosti o načinu uzemljenja, isto tako je provedena analiza dobivenih rezultata test mreže.This paper describes the problems associated with the unipol short circuit. Different methods regarding the computations are examined, while the matrix method, which is used in large electro-energetic networks, is thoroughly explored. In the beginning the general problem of the short circuit is described with its causes and consequences. Afterwards the parts of the electro-energetic network are presented with their effects on the short circuit current.The special case of the unipol short circuit and the grounded circuits is presented.In the end the test network was constructed in NEplan to compare the current strength in relation to the method of grounding. The analysis of the results was conducted in the same manner