Abstract
Substations (HV/MV) connect transmission and distribution systems with consumers of electric energy. The selective search method was used for calculation of substation reliability, where all arrangement elements were grouped into blocks. Subject of the analysis was H-arrangements comprising air-insulated switchgears on the high voltage side of HV/MV substations with different number of feeder and transformer bays and diverse scope of the installed switching equipment. Failure rate and duration were used as main HV/MV substation equipment reliability indices. A large number of arrangements were classified into groups, and within a group the arrangements were ranked with the use of multiple criteria. It is shown that the reliability of the electricity transit depends on the equipment of field for the transit of electricity, which favors poorly equipped field. On the other hand, the reliability of transformation of the full power depends mostly on the equipment in coupling field. It is essential that in the coupling field, there are at least two disconnectors. Installation of the switch in the coupling field is meaningful only with appropriate protection, because it further improves reliability. Conclusions are drawn for phased construction and expansion of the single pole diagram with an additional field for the transmission line.
Highlights
Sabirati pokazatelje učestanosti i neraspoloživosti blokova, koji dovode do prekida razmatranih funkcija, i odrediti za svaku funkciju odgovarajuće rezultujuće pokazatelje pouzdanosti
Installation of the switch in the coupling field is meaningful only with appropriate protection, because it further improves reliability
Summary
Za proračun pouzdanosti VN postrojenja u TS VN/SN u ovom radu korišćena je metoda selektivnog pretraživanja [1], koja predstavlja pojednostavljenu. Funkcionalni blok čine oni elementi postrojenja koji su tako funkcionalno povezani da kvar ili planski remont bilo kog od ovih elemenata prekida rad drugih elemenata u bloku. Učestanost i srednje vreme trajanja kvara za blok izračunavaju se iz pokazatelja pouzdanosti svih elemenata koji sačinjavaju blok. Pregledom šeme postrojenja utvrditi ispade blokova koji dovode do prekida razmatrane funkcije. Sabirati pokazatelje učestanosti i neraspoloživosti blokova, koji dovode do prekida razmatranih funkcija, i odrediti za svaku funkciju odgovarajuće rezultujuće pokazatelje pouzdanosti. Prema [4], za sve elemente šeme uključujući i merne transformatore i odvodnike prenapona koji nisu prikazani na šemama. Za pokazatelje pouzdanosti su korišćene oznake fk i rk, redom za učestanost i trajanje kvara opreme. Učestanost f, neraspoloživost u i trajanje kvarova r blokova izračunava se pomoću izraza (sumom po k obuhvaćeni su svi elementi opreme bloka):. * podaci iz [4] koji se odnose na naponski nivo od 60kV do 100kV uzeti za opremu SN, kako bi se koristili ujednačeni podaci i za opremu VN i SN
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