Lokaliseringsudstyr type ISOSCAN® EDS460-DG anvendes i kombination med ISOMETER® IRDH575, eller pulsgenerator type PGH, til lokalisering af isolationsfejl i et isoleret DC forsyningsystem (IT-system).
Den prøvestrøm der genereres af isolationsovervågningsudstyret IRDH575, eller fra pulsgeneratoren PGH, scannes og evalueres kontinuerligt for lokalisering af isolationsfejl via de måletransformatorer som er tilslutte lokaliseringsudstyret.
For hver EDS460-DG kan der tilsluttes op til 12 måletransformere.
Hvis mere end 12 afgange skal overvåges, kan der tilsluttes op til 90 EDS’er via en RS-485 interface (BMS protokol), og dermed, kan op til 1080 afgange overvåges. Den maksimale scannings tid er ca. 4…10 s, se TGH1429. Denne udstyrsvariant er særligt velegnet til isolerede net, som indeholder en høj kapacitive afledning i IT-systemet (20000 µFV, se karakteristika i kapitlet “tekniske data”).
Da både person- og driftssikkerhed er af særlig væsentlig betydning ved bl.a. raffinering af olie og gas - både når det drejer sig om offshore og onshore installationer – tilsvarende i forsyninger til medicinske områder gruppe 2 på et sygehus og på hospitaler (fx forsyning til en intensiv stue med mange stikkontakter), og i installationer der kræver en sikker strømforsyning, er det en væsentlig fordel at anvende udstyr til lokalisering af isolationsfejl.
Dette er eksempelvis også tilfældet i datacentre, hvor oppetid er af væsentlig betydning, hvorfor automatisk lokalisering af isolationsfejl er en af de mest optimale løsninger.
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