TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

DC UPS system's reliability performance: Facts and fiction

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoTELESCON 1997 - 2nd International Telecommunications Energy Special Conference
KustantajaInstitute of Electrical and Electronics Engineers Inc.
Sivut237-243
Sivumäärä7
ISBN (elektroninen)9638111623, 9789638111623
DOI - pysyväislinkit
TilaJulkaistu - 1 tammikuuta 1997
Julkaistu ulkoisestiKyllä
OKM-julkaisutyyppiEi OKM-tyyppiä
Tapahtuma2nd International Telecommunications Energy Special Conference, TELESCON 1997 - Budapest, Unkari
Kesto: 22 huhtikuuta 199724 huhtikuuta 1997

Julkaisusarja

NimiTELESCON 1997 - 2nd International Telecommunications Energy Special Conference

Conference

Conference2nd International Telecommunications Energy Special Conference, TELESCON 1997
MaaUnkari
KaupunkiBudapest
Ajanjakso22/04/9724/04/97

Tiivistelmä

Reliability performance of a DC UPS system having redundant (n+1) rectifiers and battery back-up can be naturally very high. Emergence of microcomputer based intelligent supervision and control system as well as low voltage disconnection (LVD) facilities can, however, drastically reduce or even totally destroy the naturally high reliability performance. This is quite worrying because high reliability performance is the basis for the quality of Telecom services. The reliability performance of a redundant rectifier system depends on the reliability of the individual rectifiers, on the ability of the supervision system to detect a failed unit and on the existence of common mode failure sources. The typical common mode failure sources are overvoltage protection, remote voltage control, remote shut down, internal short circuits at the output, unwise location and insufficient monitoring of LYD facilities. This paper describes the methodology to analyze the availability and reliability performance based on Markov chains. Methods and ways by which the reliability problem can be rectified are also addressed.