Analiza utjecaja grupe spoja transformatora i vrste uzemljenja na parametre kvalitete električne energije u distribucijskim mrežama

master's thesis

• Title (english): Analysis of the influence of transformer vector group and type of grounding on power quality parameters in distribution networks
• Author: Krunoslav Rendulić
• Mentor: Tomislav Capuder (mentor)
• Committee member: Tomislav Capuder (predsjednik povjerenstva)
• Committee member: Juraj Havelka (član povjerenstva)
• Committee member: Božidar Filipović-Grčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2021-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U radu je simulacijom u NEPLAN-u izvršena provjera utjecaja grupe spoja i uzemljenja transformatora na iznos naponske nesimetrije i na iznos ukupnog harmoničkog izobličenja te utjecaj naponskih prilika u NN mreži na SN mrežu. Utvrđeno je kako grupa spoja ima bitni utjecaj na nesimetriju kao i na iznos viših harmonika. Grupe spoja koje imaju sekundar direktno uzemljen imaju jače izraženu nesimetriju od mreža koje imaju izolirani sekundar, no zbog jednofaznih trošila sekundar mora biti uzemljen. Analiza viših harmonika pokazala nam je kako grupe spoja transformatora bitno utječu na iznos viših harmonika te da se transformatori s nekim grupama spoja nisu prikladni za upotrebu.

Abstract (english)

In this paper was observed the influence of the vector group and grounding of transformers on the amount of voltage asymmetry and on the amount of total harmonic distortion and the influence of voltage conditions in the LV network on the MV network by simulation in NEPLAN. The vector group has a significant effect on asymmetry as well as on the amount of higher harmonics. Vector groups that have a secondary directly grounded have a more pronounced asymmetry than networks that have an isolated secondary, but due to single-phase consumers the secondary must be grounded. The analysis of higher harmonics showed us that the groups of transformer connections significantly affect the amount of higher harmonics and that transformers with some groups of connections are not suitable for use.

• Keywords: naponska nesimetrija; viši harmonici; uzemljenje; grupa spoja transformatora; niskougljične tehnologije
• Keywords (english): voltage asymmetry; harmonics; transformer grounding; transformer vector group; low-carbon technology
• Language: croatian
• URN:NBN: urn:nbn:hr:168:979863
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-13 13:42:26