Analiza mogućnosti nastanka ferorezonanse u izolovanoj 6 kV mreži
Authors/Creators
- 1. Nikola Tesla Institute of Electrical Engineering
Description
Ferorezonansa je složena nelinearna električna pojava koja može izazvati značajna dielektrična i termička naprezanja elektroenergetske opreme, što dovodi do potencijalnih kvarova, oštećenja opreme, prekida u napajanju itd. Trofazne mreže sa izolovanom neutralnom tačkom i jednopolno izolovanim mernim naponskim induktivnim transformatorima podložne su pojavi ferorezonanse, izazvanoj interakcijom nelinearnih induktivnosti transformatora i kapacitivnosti mreže. U radu je analizirana mogućnost pojave ferorezonanse u jednoj realnoj 6 kV mreži sa izolovanom neutralnom tačkom, primenom programskog alata za proračun tranzijentnih procesa EMTP/ATP. Formiran je detaljan model mreže, uvažavajući nelinearnosti mernih naponskih i energetskih transformatora, koji je iskorišćen za analizu različitih konfiguracija, uklopnih stanja, sklopnih operacija i kvarova u mreži koji bi mogli da iniciraju pojavu ferorezonanse. Pokazano je da, u određenim okolnostima, može doći do pojave ferorezonanse i da je njen inicijator najčešće isključenje kvarova. Takođe, analizirana je efikasnost u primeni različitih mera za suzbijanje pojave ferorezonanse. Posmatran je uticaj vrednosti otpornika u otvorenom trouglu mernih naponskih transformatora na brzinu prigušenja oscilatornog procesa, odnosno na suzbijanje pojave ferorezonanse.
Abstract (English)
Ferroresonance is a complex nonlinear electrical phenomenon that can cause significant dielectric and thermal stresses in power equipment, leading to potential faults, equipment damage, power supply interruptions, etc. Three-phase networks with isolated neutral point and single-phase isolated inductive voltage transformers are susceptible to ferroresonance, caused by the interaction of the transformer's nonlinear inductances and zero sequence capacitance of power network. The paper analyzes the possibility of ferroresonance occurrence in a real 6 kV power network, with an isolated neutral point, using the electromagnetic transients program ATP/EMTP. A detailed network model is developed, taking into account the nonlinearity of voltage and power transformers, which is utilized to analyze various configurations, switching operations, and faults in the network that could trigger ferroresonance. It is shown that, under certain circumstances, ferroresonance can occur, with faults clearing being the most common initiators of ferroresonance. The efficiency of different measures to suppress ferroresonance is also analyzed. The impact of the resistance values of voltage transformer's open delta winding dumping resistor on the suppression of ferroresonance occurrence, is considered.
Files
1-47844-Ranko Jasika.pdf
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(1.2 MB)
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Additional details
Additional titles
- Alternative title (English)
- Investigation of ferroresonance phenomena in isolated 6 kV power network