@phdthesis{Xu2015, author = {Xu, Ruoyu}, title = {Comparison of switching behaviours between vacuum and SF6 technologies at 145kV network}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-36693}, school = {BTU Cottbus - Senftenberg}, year = {2015}, abstract = {This PhD project started from one basic question: whether vacuum technology can be applied to 145kV electrical power system networks as a potential substitution to SF6 technology which has been utilised for decades of practice, due to environment and economic concerns. Possible threats and challenges, which might cause problems for the proposed replacement, are identified mainly in three areas: (1) small inductive current switching, (2) capacitive load current switching and (3) short-line fault switching. Three circuit-breaker programming models, therefore, have been developed based on statistic data provided by breaker manufactures: (1) a maximum di/dt fixed model which has been utilised for small inductive current switching tests and capacitive load current de-energising tests; (2) a dynamic di/dt model adopting from Mayr's classic arc model for SF6 circuit-breakers which has been utilised for short-line fault tests; and (3) a current making model for capacitive load current energising tests. In a general conclusion, vacuum technology shows its superiority in most of the switching duties although in some rare cases, SF6 technology still stands a chance to break it even. But if we take the environment and economic factors into consideration, vacuum is definitely worth investigating in the future market.}, subject = {Vacuum; SF6; Simulation; Aufschl{\"u}sselung; Vakuum; TRV; Breakdown; High-frequency current quenching; Hochspannungsleistungsschalter; Vakuumschalter; Ausschaltverhalten}, language = {en} }