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2021, vol. 76, br. 6, str. 791-797
Impedansa sistema uzemljenja - opseg frekvencijske linearnosti
Univerzitet u Beogradu, Elektrotehnički institut 'Nikola Tesla', Srbija

e-adresavojin@ieent.org
Sažetak
Merenje impedanse sistema uzemljenja elektroenergetskog objekta u normalnom radnom režimu, predstavlja složen istraživački zadatak. Naime, u tom slučaju neminovno je prisustvo sistemskih smetnji (na mrežnoj frekvenciji i na harmonicima), koje mogu bitno uticati na tačnost merenja. U cilju prevazilaženja navedenog problema, predložen je i dokazan efikasan metod za eliminisanje sistemskih smetnji. Taj metod se imenuje kao Frequency Shift Method (FSM). FSM inherentno zahteva da dve, od tri ispitne frekvencije, budu iznad mrežne frekvencije (u našem slučaju 50 Hz). Međutim, zbog nelinearne zavisnosti impedanse sistema uzemljenja u funkciji od frekvencije, izbor ispitnih frekvencija ne može biti proizvoljan. U ovom radu, eksperimentalno je verifikovan opseg linearnosti impedanse sistema uzemljenja u funkciji od frekvencije. U tom cilju, ispitivanja su obavljena na statistički reprezentativnom uzorku od 16 transformatorskih stanica srednjeg i visokog napona. Ispitivanjima je ustanovljeno da bi gornja ispitna frekvencija trebala biti ≤80 Hz.
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O članku

jezik rada: engleski
vrsta rada: stručni članak
DOI: 10.5937/tehnika2106791K
primljen: 09.11.2021.
prihvaćen: 22.11.2021.
objavljen u SCIndeksu: 02.02.2022.
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